bluuebunny/crossref_metadata_2025 huggingface dataset:
Psychedelic Trance on the Web
Authors: Simão Emília , Tenreiro de Magalhães Sérgio , Malheiro da Silva Armando
Published: August 2015

This chapter proposes an approach about Psychedelic Trance tribe behaviours and manifestations in digital environments, and cyber ritual dynamics beyond the virtual parties in Second Life. Many spatial communities are simultaneously digital communities, and both became complements and extensions of one another. Psychedelic Trance movements and manifestations have been happening through all kinds of physical spaces, now also extended to digital spaces. Psytrance neo-nomads are now techno-nomads, moving to, from, and through the web, redefining themselves, their practices and their gatherings. In this scenario, Psychedelic Trance branches emerges everywhere, especially in social networks and three-dimensional immersive environments like Second Life. This digital migration is not only making the tribe growing, is also enhancing boundaries and increasing the individual and collective consciousness of its members. Nevertheless, even if the Trancers became simultaneously physical and virtual natives, the digital parties do not seems to replace their outside experiences.
Psytrance Influences on Touchless Interactive Experiences
Authors: Teles Paulo César , Boyle Aidan
Published: August 2015

In the fields of new media, art, and technology, we live and evolve together with multimedia interactivedigital technology. This symbiosis has made it possible to develop novel works that dialogue with theexploratory nature of the human being when confronted with unfamiliar technological equipment. The electronic music scenario brought us some elements that inspired and provoked us in this quest. The Psytrance style in particular made us realize that once a minimal simple harmony was supported by a solid rhythm, the audience could interact and control many of the sound clusters available, solely with their body movement. In this chapter we report experimental results and analysis, which point towards an approach for composing electronic music through the distinct and innovative behaviour of the participants, turning them into real performers, as well as transforming the role of the DJ/VJ by engaging them in a two-way dialogue with their audience.
An Assessment Project on the “Literacy-on-the-Job” Needs of Young Adults in Sierra Leone
Authors: Akrofi Amma , Parker Amy
Published: August 2015

This chapter outlines and describes a sponsored needs assessment process wherein a small group of researchers from various disciplines designed an approach for the burgeoning population of youth in Sierra Leone to learn literacy skills in a practical, motivating and sustainable way- “literacy-on-the-job”. In order to create a responsive and aligned intervention, the authors used a participatory methodology to understand the values and needs of representatives situated in industrial, governmental, educational and community-based youth organizations. The voices and perspectives of individuals across various businesses, schools, civic offices, and social groups were woven together to create a portrait of the complex landscape where young adults, in particular, are struggling to achieve and survive. Recommendations for a process of full implementation of the” literacy-on-the- job model” in both Sierra Leone and nations with similar landscapes are provided.
Constructing a Third Space
Authors: Millar Pauline , Warrican S. Joel
Published: August 2015

Burgeoning technologies are changing the global practices of youth to embrace a form of literacy which encompasses both skills and multimodal forms. In Barbados this has been perceived as disengagement from conventional literate practices and has caused concern in the wider Barbadian community. This view is reinforced by the seemingly ubiquitous engagement of youth with various forms of communications technology rather than traditional text. This chapter presents some insight, in the context of a Barbadian secondary school, into an action research project which sought to bridge the existing divide between traditional and semiotic literacies. This investigation confirmed that students were engaged in literate acts in diverse ways. The creation of third space required revised assumptions about the nature of literacy and redefined roles for teachers and students. This chapter concludes with recommendations for increased dialogue, collaboration and professional development among Barbadian secondary English teachers on issues related to literacy.
Parental Perspectives on Dual Language Classrooms
Authors: Bauer Eurydice Bouchereau , Harrison Dorian
Published: August 2015

Although limited research studies exist on African-Americans in dual language programs in general, even less exist on African American parents' experiences within dual language programs. In this chapter, we present the voices of nine African-American parents. These voices serve as a lens to understand the ways in which the program impacted these parents' homes and the lives of their children. The data was gathered within the first two years of a dual language program. Each of the families was interviewed twice across two years. Three major findings emerged. First, the capital that students gained in school impacted the adults at home. Second, these new home interactions based on students' school learning influenced parents' and students' views of themselves and their community. Third, in the home and in the community, ambivalence was reflected regarding learning basic school concepts in a second language. This study captures the tug and pulls associated with families wanting to provide their children with the best opportunities within a racialized society.
Becoming Teacher Researchers
Authors: Razfar Aria , Troiano Beverly , Nasir Ambareen , Yang Eunah , Rumenapp Joseph C. , Torres Zayoni
Published: August 2015

Drawing on three years of data, we show how an embedded university research team and eleven K-8 educators reorganized learning and negotiated innovative curricular activities for English learners (ELs) in spite of restrictive curricular mandates in an urban Midwestern district. We analyze how participating teachers appropriated theoretical constructs such as cultural historical activity theory (CHAT), third space, funds of knowledge, as well as using discourse analysis to design curriculum aimed at improving language learning through mathematics, science, and community-based problem solving. The learning of teachers was purposefully designed to develop new professional identities. The learning was also designed to move teachers from deficit views of multilingualism to dynamic stances grounded in polyglot language ideologies. We examine the challenges and opportunities of participants' movement from resistant, procedural, and ethnographic identities towards teacher researcher identities.
Sociolinguistic and Educational Perspectives on Code Switching in Classrooms
Authors: King James R.
Published: August 2015

In educational contexts, codeswitching (CS) is deployed in a binary fashion. Either CS is a productive strategy (a translanguaging, revisionists' claim), or CS is a “bad habit” signaling linguistic deficits. Some of the variance in understanding CS results from specific contexts. When a second language is used in a content classroom, the productive use of CS as a viable strategy for explication, management, and community building may also suffer from confusion. Yet, CS in language classrooms is a concern for teachers. Confusion emanates from two theoretical accounts for CS (structural and functional). For educational uses, CS suffers from this “split personality,” with resolution found in a “contact zone” account. I draw from the cross-cultural and cross-linguistic contexts of South Africa to explain notions of CS, and specifically as CS relates to literacy in some cases. The cross-cultural components play a role in explaining CS as it relates to literacy.
Consolidating Commonalities in Language and Literacy to Inform Policy
Authors: Smith Patriann , Kumi-Yeboah Alex
Published: August 2015

This chapter demonstrates how literacy and language planning and policy (LPP) research may be consolidated to inform recommendations for local language policy development and pedagogical literacy instruction in the English-speaking Caribbean region. To achieve this goal, we first identify patterns in literacy research across countries and contexts in the English-speaking Caribbean region, noting assumptions underlying the literature. We then discuss the ways in which language use evolved in one of these English-speaking Caribbean countries, noting the impact of historical and global forces. In presenting St. Lucia as a critical case where Language Planning and Policy (LPP) research, and particularly, the ways in which the historical epochs in which this research has been undertaken influenced the evolution of language use in the country, we identify strategic, epistemological and macro sociopolitical insights emanating from our discussions of language use in this Majority World nation.
The Role of Context in Defining Secondary Language Arts Instruction
Authors: Robinson Sandra
Published: August 2015

Warrican's (2009) report on the literacy instructional implications for secondary teachers resulting from the implementation of Universal Secondary Education (USE) in the Eastern Caribbean considered secondary teachers' perceptions of their pedagogical competence–from feelings of frustration to a growing sense of inadequacy. Meanwhile, the Caribbean Examinations Council (CXC) continues to report dissatisfaction with the delivery in English at the secondary level. This chapter offers a snapshot of the context of secondary education in general and English Language Arts in particular in the Eastern Caribbean. It draws the teaching of secondary English towards a particular set of answers to the question of pedagogical knowledge that should be of concern to secondary teachers of English. These ideas include the use of context as a central factor in interpreting secondary schooling; examination and classroom practice; and the use of professional development and collaborative practice to anchor pedagogical knowledge and experience.
The Simulation Model of Rotation Speed and Media Loading on Grinding Performance of a Horizontal Stirred Mill
Authors: Zhang Shao He , Dong Wei Min , Liu Xiao Feng
Published: August 2015

This paper explores effect of rotation speed and media loading on grinding performance of the horizontal stirred mill using the combined method of experiment and simulation on prototype. It selects rotation speed and filling rate to constitute simulation experimental group and conduct the simulation in the EDEM. By studying the effect of rotation speed and medium filling rate respectively on the movement of the medium, the power and the energy utilization,it draw the conclusion of the effect of the rotation speed and medium filling rate on the grinding performance.
Numerical Simulation of the Laminar Flow Field in Stirred Tank with Double Layer Combined Impeller Stirring Eccentrically
Authors: Liang Ying Na
Published: August 2015

Computational fluid dynamics (CFD) method was applied to study the flow field in cylindrical stirred tank mixing non-Newtonian fluid with double layer combined impeller of upper-straight-blade and lower-inclined-blade. The laminar model and the multiple reference frame (MRF) were employed to simulate the three-dimensional flow field in stirred tank with double layer combined impeller rotating at a constant speed of 200 r/min mixing the mixture of glycerin and water centrally、eccentrically and relative eccentrically, and three different flow structures in stirred tank were obtained. Analyzing the velocity vectors, the velocity contours and the axial、radial and tangent velocity distribution curves, the rule of velocity field with the blade combined form and the stirring structure was discussed. The research provided the valuable reference for the design and practical application of the laminar stirred tank.
Performance Analysis of Centrifugal Compressor under Different Operation Conditions
Authors: Lu Yu Liang , Zhao Yun Feng , Liang Bo
Published: August 2015

Centrifugal compressor in bootstrap turbine cooler was studied to build computational model of flow domain for compressor component. The relationship between pressure ratio πc, efficiency ηc, flow rate G and rotational speed N was calculated by 3D numerical method. Experimental data were compared with the calculated results and good agreement was achieved. It indicated that performance characteristics of centrifugal compressor under off-Design condition could be predicted by computational fluid dynamics (CFD) technology. Furthermore, internal flow characteristics and load distribution could be visualized directly by CFD post processing graph.
Distributed Monitoring and Intelligent Fault Diagnosis System for Large-Scale Electro-Hydraulic Devices
Authors: Hao Gui You , Cheng Jie , Zheng Zong Gui , Yu Zhi Gang , Wu Gang
Published: August 2015

In this paper, a distributed monitoring and intelligent diagnosis system is designed for large-scale electro-hydraulic devices, based on the utilization of information fusion technology. As a result of using multi-sensor data level, feature level and decision-making level information fusion methods, both precision and real-time performance of condition monitoring and fault diagnosis have been greatly improved, which leads to an advance in the accuracy of monitoring and diagnosis.
Integration Design and Simulation of Hydraulic Actuated Control System of Helicopter
Authors: Gu Feng , Jiang Ji Hai , Diao Fei Meng , Song Yan Nan , Du Quan , Gao Lei , Li Yan , Qu Chang
Published: August 2015

Hydraulic system is one of the most important parts of helicopter. Its function is to supply hydraulic power to the utilities. This paper studies an integration hydraulic system applied in helicopter flight control actuating system and simulates the system. The system has a small volume, light mass, meeting the requirements of helicopter control system actuating.
Performance Comparison of Displacement and Speed Control in Electro-Hydrostatic Actuator
Authors: Jiang Ji Hai , Liu Qiao , Liu Jun Long , Hou Zhen Xiu
Published: August 2015

In recent years, power by wire (PBW) technique is developed in the European and American aviation field, and one of its important bases is electro-hydrostatic servo technique. In this paper, speed controlled and displacement controlled electro-hydrostatic actuation systems are modeled and simulated, by comparing their Bode graphics and time-zone respond curves, which shows that displacement control has small load inertia and high gain, so its dynamic performance is better. Thus, conclusion can be drawn that speed-displacement composite control may indeed improve the dynamic performance of electro-hydrostatic actuator.
Design of a Pneumatic Flow Rate Control Microvalve Driven by a Stepper-Motor
Authors: Wang Jin Xian , Wen Zeng , Li Song Jing
Published: August 2015

A pneumatic microvalve which can be used in pneumatic pressure control for lab-on-a-chip applications is presented in this paper. In order to realize a feedback control and miniaturization, a micro stepper-motor is selected to control the opening of the microvalve. After introducing the structure and working principle of the pneumatic microvalve driven by a stepper-motor, the static flow rate simulation of pneumatic stepper-motor microvalve is processed in the condition of different opening sizes of the microvalve and pressure difference over the valve. The stepper-motor microvalve is fabricated and corresponding control circuit is designed. Experiments on static and dynamic characteristics of the microvalve are carried out. Good agreement has been shown between the simulation and experimental results.
A PV Module Surface Dust Removal Device Simulation
Authors: Li Jiang Hua , Zhou Kang Qu , Gong Heng Xiang , Zhu Xin Cai
Published: August 2015

In this paper, PV module parameters of dust removal equipment are analyzed; the dust removal device model is established by using solidworks software; the motion simulation of removal process is conducted directly in solidworks motion simulation interface; a comparison of dust removal effects is made between the top-down and the left-to-right dust removal device at the same traction speed and brush dust removal brush rotation speed; a conclusion is drawn that brush traction speed, rotation speed, and helix angle have impact on dust removal effect and the two devices are close to each other in terms of dust removal effect, which provides some theoretical evidence for further design.
Fuel System Configuration and Restructuring of MALE and HALE UAV
Authors: Liu Xiao Dong , Li Shu Lin , Tang Yao
Published: August 2015

To meet the demand for long-endurance capabilities,MALE (medium-altitude long-endurance) and HALE (high-altitude long-endurance) UAVs are generally equipped with wing tanks to increase fuel loads. MALE and HALE UAVs use relatively larger aspect ratio wing to provide larger wing area and smaller wing thickness, so that the relative thickness of wing tank is smaller and its center of gravity is further away from the aircraft center of gravity, and the moment of inertia is greater. As a result of aerodynamic and structural arrangement, the horizontal and vertical manipulation of safety control and balance of such UAVs is very sensitive, thus making ​​higher demand for the fuel system. This paper describes and summarizes the typical fuel system design of MALE and HALE UAVs for fuel transfer and restructuring design, primarily focusing on fault condition, reconfiguration and the center of gravity control, and providing reference for fuel system design.
Power Loss of Slipper within Axial Piston Pump
Authors: Wang Ze Bo , Jiang Ji Hai , Sun Yi
Published: August 2015

The pair between slipper and swash-plate is an important friction pair in the axial piston pump. Due to quick relative velocity, alternating load, numerous slippers, and high contact pressure between the friction surfaces, the wear-out and fatigue failure constantly occurs, which is one of the key factors affecting reliability of the piston pump. It is of fundamental significance to investigate the mechanism of slipper power loss and to find an appropriate method to improve the lubrication of the slipper. Here, the model of friction power loss between slipper and swash-plate is established, and the friction power loss between slipper and swash-plate is solved and comparatively analysed. Finally, the correctness of theoretical analysis and simulation results are verified by experiments.
Design and Simulation Analysis of the Multi-Stage Linear Synchronous Expanding and Contracting Hydraulic Cylinder
Authors: Ding Wen Si , Liao Jian Yuan , Yuan Lin Yan
Published: August 2015

A double-action three-stage synchronous expanding and contracting hydraulic cylinder has been designed based on the principle of synchronous expanding and contracting hydraulics cylinder. The Principle of linear synchronous expanding and contracting hydraulics cylinder and the main points of design have been discussed. Modeling and simulation are conducted in AMESim system and the result shows that the multi-stage cylinder can expand and contract synchronously and smoothly. As long as the effective area is proportional, the multi-stage cylinder can move linearly.
Fluid-Solid Coupling Heat Analysis of Aerostatic Guide Components
Authors: Long Wei , Liu Yan , Wu Zhang Yong , Wei Jing Tao , Mo Zi Yong
Published: August 2015

This paper presents the parameters and assumptions of the hydrostatic guide rail in both ideal and actual working conditions, the simulate calculation of fluid-solid heat coupling field between gas film and the bearing surface is finished by Fluent based on finite volume method. By analyze and compare the results after post-treatment, we gain the effects caused by guide way’s structure and deformation on the formation of film pressure field, temperature field inside gas film, besides this paper also provides relate conclusions.
Properties of Piezoelectric Layer Deposited by Sol-Gel Method for MEMS Sensor Applications
Authors: Fazmir H. , Wahab Y. , Anuar A.F.M. , Zainol M.Z. , Najmi M. , Mazalan M. , Md Arshad M.K.
Published: August 2015

A layer of ZnO thin film was deposited repetitively 15 times on a silicon substrate by sol-gel spin coating technique. The structural and electrical characteristic of the thin film was studied and presented. For structural characterization, Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM) analysis were chosen while Semiconductor Parametric Analyzer (SPA) was used to measure the electrical characteristic. The ZnO thin film thickness were measured to be between 165 nm to 180 nm. The resistance increased proportionally with annealing temperature with the lowest value of 80Ω. Structurally, the grain sizes of the ZnO thin films increased with the increase in annealing temperature. The root mean square (RMS) and average surface roughness (Ra) were measured respectively.
Predicting the Actual Strength of Open-End Spun Yarn Using Mechanical Model
Authors: Hernawati Resty Mayseptheny , Putra Valentinus Galih Vidia , Fauzi Irfandhani
Published: August 2015

On this journal, modeling relation of rotor speed and rotor diameter toward yarn tension on take-off nozzle has been validated by theoretical approach and numeric computation.It shows that value of yarn tension is F=(1,4.10-13)Tt nR2dR2[cN]. Excessively high spinning tension always results in an intolerable increase in yarn breakage. This paper presents a comparative study of theoretical and reference-based experimental result for predicting the actual strength of open-end spinning system.
Simulation and Optimization of Solar Thermal Cooling System in Manufacturing Research Center Building to Reduce Operational Cost Using Software EnergyPlus and GenOpt
Authors: Nasruddin  , Rahadian K. , Alhamid M.I. , Arnas
Published: August 2015

Solar Thermal Cooling System with its absorption cycle is expected to replace the conventional air conditioning system with vapor compression cycle because it is more efficient in terms of cost and energy. However, due to the heat of the sun is not always stable, the system needs to be equipped with a backup energy source, one of which is CNG. In the Manufacturing Research Center building, the lack of facilities that support availability of CNG causes large operational cost. Therefore, optimization efforts with the aim to reduce operational cost are needed. Simulation and optimization performed with EnergyPlus and GenOpt. The conclusion is that the installation of 187.5 kW electric tankless water heater is able to reduce total operational cost by 34.65% compared to system that uses combination of solar thermal and CNG and 49.69% compared with system that uses only CNG.
An Experiment of Spike Detection Based Mental Task with Ayes Movement Stimuli
Authors: Turnip Arjon , Redhyka Grace Gita , Alam Hilman S. , Setiawan Iwan R.
Published: August 2015

In this paper, an experiment of spike detection based mental task with ayes movement stimuli is reported. The approximation of ICA algorithm is required to eliminate artifacts and detect a pike of brain activity according to the given stimuli which are normal, closed, and blinking ayes. A comparison of ICA algorithms based Extended Fourth Order Blind Identification and Algorithm for Multiple Unknown Signal Extraction is tested. The quality of the extracted signals is measured through the value of the signal to interference ratio and signal to distortion ratio. The extracted results indicate that the best spike detection is achieved using AMUSE algorithm.Keywords:EEG,spike, IndependentComponent Analysis (ICA).
Automation Broadcast Radio Controlled by Using Audio Mute Clock
Authors: Pattanajakr Adisak , Siritaratiwat Apirat , Kruesubthaworn Anan
Published: August 2015

This paper presents distribution and automation radio broadcasting organization that is operated by international radio stations such as Voice of America (VOA) using the control center that must rely on the cost of the electrical and electronic instruments and the operation and must be very high dependency computer technology that is relative to clock and must be done regularly to ensure the accuracy. The changing schedule of automation radio broadcasting controlled by programmable logic controller, PLC [1] and the master clock [2] is time in second is required to execute the PLC program for every changing of the schedule program. The ideology of silence of sound signal (Audio Mute) is used when each program ends instead using the master clock to execute the PLC program for changing the schedule radio program. The application of audio mute for changing new schedule when each program ends can be compared with the using the master clock controlling the PLC will be also minimum deviation of the time that will impact on automation radio broadcasting.
Intrusion Detection System Based on Hybrid Feature Selection and Support Vector Machine (HFS-SVM)
Authors: Khaokaew Yonchanok , Anusas-Amornkul Tanapat , Meesublak Koonlachat
Published: August 2015

In recent years, anomaly based intrusion detection techniques are continuously developed and a support vector machine (SVM) is one of the technique. However, it requires training time and storage if there are lots of numbers of features. In this paper, a hybrid feature selection, using Correlation based on Feature Selection and Motif Discovery using Random Projection techniques, is proposed to reduce the number of features from 41 to 3 features with KDD'99 dataset. It is compared with a regular SVM technique with 41 features. The results show that the accuracy rate is also high at 98% and the training time is less than the regular SVM almost by half.
Internet Cigarette and Tobacco Business (ICTB) Database for Domestic Markets in Thailand
Authors: Soontornpipit Pichitpong , Viwatwongkasam Chukiat , Satitvipawee Pratana , Pramnoi Pattarakun , Wattananupong Adrian
Published: August 2015

This research presents a cross-sectional survey for monitoring and analysis of illegal sales of cigarettes or tobacco products on the internet in Thailand from June 2010 to June 2014. The websites are collected monthly and classified into four categories: blog, webboard, social network and online shopping. First the data was gathered by using manpower and later by an algorithm program. Each data category is separately analyzed and carried out to gather information from the details of tobacco products and websites such as product types, brands, prices, promotions, and payment methods. The databases are later submitted to three regulators, Thai Hotline, Royal Thai Police, and ICT, to close the websites and arrest distributors.
Performance of Interworking Proxy for Interconnecting IEEE1888 Standard at ETSI M2M Platforms
Authors: Klinpratum Teerapan , Saivichit Chaiyachet , Elmangoush Asma , Magedanz Thomas
Published: August 2015

In the near future, many electronic devices will be equipped with internet connectivity in which they can communicate with one another. They will be also capable of being monitored and automatic controlled from remote location. As a result, IoT (Internet of Thing) architecture shall thrive in the soon future. Interoperability among various access technologies and many kind of devices become one of crucial concern for the upcoming extensive network infrastructure.
Android Antivirus Scanner by Analyzing Operation Codes
Authors: Narang Komal , Sookhanaphibarn Kingkarn , Praneetpolgrang Prasong
Published: August 2015

This research presents a model for malware detection on mobile operating system based on analyzing the operation codes. The research processes are as follows: (1) achieving of both malicious and benign codes on android operating system, (2) extracting features based on the distribution of n-grams frequency where the parameter n = 3 is used, and (3) constructing a model for classification the malicious codes using the extracted features for both malicious and benign codes. In the experiment, 304 malicious codes and 553 benign codes were using to construct the model. The experiment shows that the model achieved more than 85.52% accuracy. For the sensitivity and specificity, the model achieved 71.26% and 90.52%, respectively.
Optimization of p-Cycle Protection in Mixed Line Rate WDM Networks with Limited Transmission Reaches
Authors: Sornplaeng Puttipong , Saengudomlert Poompat , Wuttisittikulkij Lunchakorn
Published: August 2015

We consider the problem of routing and rate assignment with p-cycle protection for mixed line rate (MLR) networks that are limited by transmission reaches. The problem is formulated mathematically as integer linear programming (ILP) problems under two different assumptions. First, we consider using each p-cycle to protect working lightpaths at common fixed line rate, and refers to this case as the fixed cycle rate (FCR) approach. We then perform comparative study between the FCR approach and the mixed cycle rate (MCR) approach, which is the second case and allows each p-cycle to protect working lightpaths with various rates. The objective of each ILP problem is to minimize the overall cost function, which consists of transponder operating cost, as primary costs and p-cycle operating costs, as secondary costs. Number results show that the MCR approach yields lower cost and is more efficient as the traffic increase when compared the FCR approach. In addition, we compare the use of MLR networks to the use of single line rate (SLR) networks to verify that MLR networks yield lower costs.
Yield Analysis Based on the Defect Analysis with Derivative Method
Authors: Praepattharapisut Warakorn , Pengchan Weera , Phetchakul Toempong , Poyai Amporn
Published: August 2015

This paper presented the corresponding between the yield equation prediction from Poisson, Murphy with wafer actual yield on the silicon wafer with 0.8 μm CMOS technology. The defect analysis with derivative method, current - voltage and capacitance-voltage of diode characteristic measurement, is used to define the defect in p-n junction on silicon wafer. The different sampling numbers of chips are used to calculate the yield. Finally the calculated data and actual would be compared and found that at sampling number is 25, the tolerance from actual yield is less than 3%.
A Simple Fully Controllable Schmitt Trigger with Electronic Method Using VDTA
Authors: Siripruchyanun Montree , Satthaphol Pracharat , Payakkakul Kangwal
Published: August 2015

A simple Schmitt trigger employing single VDTA (Voltage Difference Transconductance Amplifier) and one grounded resistor is proposed. The feature of the proposed Schmitt trigger is that its output hysteresis and amplitude can be independently adjusted. The PSpice simulation results are disclosed, it agrees well with the theoretical anticipation. The total power consumption approximately 443µW at ±1.5V supply voltages.
Role of Intergrain and Intragrain Coupling on Switching Field of Granular Exchange Coupled Composite Media Using Microwave Assisted Magnetic Recording
Authors: Wannawong Naruemon , Kaewrawang Arkom , Pituso Kotchakorn , Tipcharoen Warunee , Siritaratiwat Apirat
Published: August 2015

Microwave assisted magnetic recording is one interesting magnetic recording technology to improve writability for high areal density of hard disk drive. In this work, the role of intergrain and intragrain coupling and microwave field is investigated by micromagnetic simulation based on the Landau - Lifshitz - Gilbert equation. The results show that the switching field, Hsw, of media with microwave field, Hac, of 10 GHz is lower than that for media without Hac. The exchange coupling between nearest neighbor grains hardly affects the Hsw of media and slightly affects the slope of hysteresis loop. In addition, the slope of hysteresis loops and Hsw decrease with increasing exchange coupling in each grain. The results from this work can lead to obtain the improvement writability and increasing areal density of hard disk drive.
Investigation of Perpendicular Magnetic Recording Footprint by Spin-Stand Microscopy
Authors: Chaidaungsri Nuttapon , Kaewrawang Arkom , Chooruang Komkrit , Tongsomporn Damrongsak
Published: August 2015

The characteristics of magnetic recording are necessary to understand in order to increase the areal densities and improve the perfermance of recording system. Therefore, experimental tools must be developed to help researchers to carry out signal and noise recording experiments on different heads and media combinations. In this paper, the perpendicular magnetic recording footprint using spin-stand microscopy is demonstrated. It was found experimentally that the magnetic footprint can precisely catch some recording dynamics of the write heads during the write gate off conditions and also provide useful insight information of the recording performance.
Grounding Design Improvement to Reduce Back Flashover Rate of 69 kV Subtransmission Line in Power’s Distribution System
Authors: Songsang Arnon , Rugthaichareoncheep Nattachote , Phayomhom Att
Published: August 2015

This paper presents the grounding design improvement to reduce back flashover rate from the lightning of distribution system. The Purpose to reduce effects of lightning overvoltage from back flashover. And study analysis of the condition effects of lightning performance of 69 kV on Metropolitan Electricity Authority (MEA)’s distribution system of Thailand. The technique objective function is an attachment the external ground wire connected between the overhead ground wires and a ground rod for reduce back flashover. Back flashover is one of the major causes of sustained interruption data. Occurs when the amplitude of lightning overvoltage is more than the limit of insulator strings specification. Then generated flashover on insulator skin and induces the voltage line. This paper simulation with Alternative Transient Program-Electromagnetic Transient Program (ATP-EMTP) and analysis of lightning performance in terms evaluated pole top voltage and back flashover rate (BFOR). Result after installing the external grounding design system can reduce the effects of lightning and can improve the reliability in distribution system. And the grounding systems designed is can use for guide line to the features typically at locations subject to lightning damage.
Model of Power Factor Charge for Photovoltaic Generation System Based on its Contribution to Power Systems
Authors: Hemsuree Marut , Thiranan Chanan , Chaitusaney Surachai
Published: August 2015

This paper proposes a power factor charge model, which considers the operation of photovoltaic generation system (PVGS). The proposed model is aimed to encourage Very Small Power Producer (VSPP) to have contribution, by its operation, to voltage regulation in the connecting power system. The proposed model allows PVGS has to either consume or supply reactive power for maintaining system voltages to be within an acceptable range. In the financial part, consuming or supplying reactive power may cause the power factor charge to be increased while the opportunity for generating active power (PVGS income) to be reduced. The proposed model is tested in impact of PVGS to utility grid, and the results show that PVGS can have contribution to grid support.
The Impact Mitigation of Partial Shading on PV Array Power Generation
Authors: Phiouthonekham Santisouk , Lekkruasuwan Anucha , Chaitusaney Surachai
Published: August 2015

The impact of partial shading on photovoltaic (PV) array is discussed in this paper. The partial shading on PV array can significantly decrease the power generation of PV array. This study examines the modeling of PV module which relates with solar irradiation, temperature, and shading pattern. There are different shading patterns on PV array, such as one-string shading, two-strings shading, and much more. The characteristics of current-voltage (I-V) and voltage-power (V-P) curves for each individual the PV array can be different dependent on the multiple MPPs, maximum power points (MPPs). These multiple MPPs are basically lower than the MPP in case of no shading. Therefore, the total generated energy in an interested time period is usually reduced. As a result, this paper proposes the appropriate arrangement of PV modules in a PV array in order to mitigate the impact of partial shading. Finally, the proposed arrangement of PV modules is tested in a testing system. All the obtained results confirms that the proposed arrangement of PV modules is effective and can be applied in practice.
Sheath Voltages and Currents in 230kV Oil-Filled Underground Power Cables
Authors: Phanthurat Surasak , Pruksanubal Apibal
Published: August 2015

Three-phase underground power cables can induce voltages and currents in their recover sheaths. The induced voltages and currents in sheath are undesirable. They generate heat losses and reduce the cable ampacity. Moreover, the induced voltages can generate electric shock to the workers, who maintain the power cables. It is very important to predict the sheath voltages and currents, which depend on different parameters, such as the sheath grounding system, the geometry of the cables, the gap between them, etc. In this paper, the voltages and currents induced in sheath for different installation of underground power cables (trefoil and flat formation) are studied and presented. For each case study of installation, the results of sheath voltages and currents have been computed and compared. Finally, the case of cross bonding with increasing of cable spans can reduce the sheath voltage significantly.
Impact of On-Grids Solar PV Rooftop on Low Voltage Grid Systems: A Case Study of PEA Udonthani, Thailand
Authors: Khuleedee Weerachat , Kaewrawang Arkom , Tonmitr Kittipong
Published: August 2015

This paper presents the impact of on-grid solar PV rooftop on local power systems of 10 kW - typical low voltage power rating for households campaigned by Thai Government. The overvoltage, frequency variation and harmonic contamination was investigated and analyzed. The condition of peak power generated from PV was also considered. The experimental data used for the analysis were collected by turning on and off the solar PV system of PEA power system on Udonthani province, Thailand for every hour with duration time between 6.00 AM and 6.00 PM. The results showed that the voltage at the connecting point of solar PV rooftop to the grid increases from 5-8 V (2.3-3.6%.).The frequency slightly increases from 49.97-50.06 Hz. In addition, the total harmonic distortion is not significantly different - varying in narrow range of 0.1-0.2 VTHD.
Feasibility Design of 4G-LTE Cell Sites in an Academic Community
Authors: Somchai Sophonwit , Potinakkha Jirun , Ruangchaijatupon Nararat , Prasertchareonsuk V. , Leeprakobboon M. , Jongudomkan J. , Malisuwan Setthapong , Siritaratiwat Apirat
Published: August 2015

This paper shows the feasibility analysis of the 4th generation (4G) telecommunication system on 800-900 MHz spectrum. It applies the Long-Term Evolution (LTE) wireless communication and makes a feasibility design of cell site placement. An academic community is selected as a studied site because the high usage of advanced communication technologies. Due to the variety of population density, age, and gender, Khon Kaen University is chosen. This paper also suggests the model for cell site installation and cell site positions in Khon Kaen University area.
Impacts of Low Voltage PEVs Single Phase Charging on Electrical Distribution Network
Authors: Klayklueng Thongchai , Dechanupaprittha Sanchai
Published: August 2015

This paper presents impacts of low voltage PEV single phase charging on electrical distribution network. Simulation model and analysis tools under DigSILENT Power Factory program were used in this research. There are 5 case studies under this analysis, where each case operates at different charging time durations between 16.00 and 24.00. Assessment of the impact of PEV charging is performed based on the PEA standards. The simulation results show that all charging case studies increase line loading in the distribution network over the limit by 80%. The voltage at the upstream point of the feeder slightly dropped while at the downstream point dropped 4 times lower. Average line losses for all case studies increase approximately 13.36% compared to the base case study.
UHF TV Band Transparent Antenna for Indoor Television Reception
Authors: Sa’don Siti Nor Hafizah , Kamarudin Muhammad Ramlee
Published: August 2015

The characteristics of transparent antenna for indoor television reception are investigated. It operates at Ultra High Frequency (UHF) band. The proposed antenna was made from silver coated polyester film (AgHT-4), the transparent conductive material and it is attached on a layer of glass substrate at both sides. The overall antenna length and width is at 150 mm x 50 mm. It has not fully ground plane and fed by a 50 Ω feedline. The meander line is designed at the feedline to broader the bandwidth. The simulated bandwidth obtained is 505.37 MHz to 802.45 MHz at level -6 dB. The rough impedance bandwidth is 297.08 MHz or 45.43 %. All the radiation patterns over the UHF band show bi-directional for E-plane and omni-directional at H-plane. The maximum gain obtained is 1.88 dBi.
Electrical Stress Analysis of Switching Transients in 115 kV High Voltage Substation
Authors: Kem Ratana , Srisongkram Warunee , Fuangpian Phanupong , Suwanasri Thanapong
Published: August 2015

This paper presents electrical stress analysis from capacitor bank switching in a 115 kV substation. The actual data of all equipment in substation are used in the simulated circuit by using ATP/EMTP program. The cases study focused on the determination of proper value of series reactor, effect of circuit breaker pole discrepancy on inrush current, line model selection and load variation. Electrical stress from energizing inrush current as well as transient recovery voltage and rate of rise of recovery voltage imposed on power circuit breaker during capacitor bank has been analyzed. The obtained results are used as guidelines for analysis of the electric stresses on substation equipment while capacitor banks are energized. Moreover, those results can be used to select the proper rating of circuit breakers to withstand the electric stresses in the transmission network.
The Adaptive Network Coding-Routing (ANCR) Based on Graph Minors for Multicast Networks
Authors: Muangboonma Nakhon , Puttarak Nattakan , Kaewprapha Phisan
Published: August 2015

The multicast wireless network, where a source needs to deliver packets of data to a set of destination through a group of relays over a network topology, is degraded by a limited bandwidth and capacity regime. Network throughput can be improved using network coding. However, the network coding might or might not be helpful to increase throughput due to an unpredictable network topology. In this paper, we propose an adaptive network coding-routing (ANCR) algorithm to automatically select whether a packet can construct a network code at a relay node before forwarding to destination or not based on the minor of network graphs. If there is no an appropriate packet, the relay will forward a data packet using routing protocol. The results show that this technique can significantly improve both throughput and timeslot usage. The throughput gain at a bottleneck relay node is increased by 35%, while the timeslot usage is decreased for more than 30%.
Street Lamps Monitoring System Using Relay Control Technique
Authors: Kavichai Eakdanai , Deelertpaiboon Chirdpong
Published: August 2015

This research proposes a simple but very effective method to determine faulty street lamps by utilizing a microcontroller associated with relay control technique to analyze the current consumption of the lamps. With such approach, the lighting system can automatically report the number and the position of the faulty street lamp to the operator in the control room. As a consequence, the faulty street lamp can be quickly repaired. The user interface and controller are programmed in LabVIEW software. The result is verified by modeling street light system using five 100 watts incandescent light bulbs connected in parallel. The results of this research can be applied to improve the existing street light system especially in Thailand. Furthermore, equipment used in this research is cost effective.
A Seamless Transitions Method for On-Grid and Off-Grid Modes of DG Systems
Authors: Juntason Wutthiwong , Supatti Uthane
Published: August 2015

A method for the seamless transition of inverters switched between On-grid and Off-grid modes for a distributed generation (DG) unit is presented in this paper.In this method,voltage-controlled is used in Off-grid mode and power-controlled is used in On-grid mode, The seamless transfer operation between these two modes perform fast dynamic response. The controller is also capable to follow the voltage, current to grid.
Lead Lag Controller of TCSC Optimized by Bees Algorithm for Damping Low Frequency Oscillation Enhancement in SMIB
Authors: Arzeha Nurul Aziah , Mustafa Mohd Wazir , Mohamed Idris Rasyidah
Published: August 2015

Power system is often vulnerable to low frequency electromechanical oscillations due to the interconnected configuration. A common lead-lag controller is used for one of the FACTS devices known as Thyristor Controlled Series Compensator (TCSC) as supplementary controller for damping purpose in order to improve transient stability and power oscillation damping of the system. As Bees Algorithm (BA) optimized the parameters of the TCSC lead-lag controller, thus its named is TCSC-BALL. In this study, the optimization problem is formulated as a constrained optimization with the main objective is to move the system eigenvalues to the left as far as possible in order to improve the system stability. Then, the system is simulated in MATLAB by using The Phillips-Heffron model for single machine infinite bus (SMIB) with responses of increases in mechanical power at t=1 second. The performance is observed in terms of electromechanical eigenvalues position on s-plane and damping responses of low-frequency oscillations where the system implemented with the TCSC-BALL controller given better results as compared to the system without and with the inclusion of conventional Power System Stabilizer (CPSS).
A Coordinated Voltage Control Scheme for Distribution Network with Renewable Sources
Authors: Nakawiro Worawat
Published: August 2015

With significant penetration of renewable energy sources in distribution networks, the voltage control method may have to be revised especially during the light load condition. This paper presents a coordinated voltage control strategy to address this issue. A mixed-integer nonlinear optimal power flow was formulated and solved by Particle Swarm Optimization (PSO). All system constraints and operating limits are considered. The code was written using DigSILENT programming language (DPL) and implemented inside DigSILENT power factory simulation software. The proposed method can minimize generation curtailment to prevent overvoltage at any buses. A realistic distribution network was adopted to demonstrate the systems’ effectiveness. Simulation results show that all security constraints are maintained within operating limit. Power losses at the same time are minimized in comparison to the losses using the classical control method.
Investigation on Feeding Techniques for Rectangular Dielectric Resonator Antenna in Higher-Order Mode for 5G Applications
Authors: Shahadan Nor Hidayu , Kamarudin Muhammad Ramlee , Zainal Noor Ainniesafina , Nasir Jamal , Khalily Mohsen , Jamaluddin Mohd Haizal
Published: August 2015

This paper presents the investigation on rectangular dielectric resonator antenna (RDRA) using three different feeding techniques that are microstrip slot aperture (MSA), microstrip line (ML) and open-end coplanar waveguide (OECPW). In order to increase the RDRA size and gain for 5G applications, the higher-order mode was used to excite the RDRA at the frequency resonant 28 GHz. Duroid dielectric substrate was used with a thickness of 0.254 mm, a permittivity of 2.2 and a loss tangent of 0.0009. Verification of the comparison was done by simulation using Ansoft HFSS. The simulated result for reflection coefficients, bandwidth, gain, radiation pattern and E-field strength was analyzed and compared.