bluuebunny/crossref_metadata_2025 huggingface dataset:
Pre-Service Teachers' Development of Digital Literacies
Authors: Wang Le , Feng Pengpeng , Chen Jing
Published: October 2017

Digital literacies are gaining popularity in teacher education over the past decade, but little research has been conducted on the developmental trajectories of pre-service teachers' digital literacies while digital practices in their daily routines cannot necessarily be transformed into digital literacies in the educational setting. Using a case study methodology, four L2 Chinese pre-service teachers were examined during the spring semester of 2016 when they assisted teaching in a wiki writing classroom. Data was collected through semi-structured interviews and observation diaries. Drawing upon the framework of digital literacies, this article identifies the core components and traces the developmental trajectories of digital literacies in a wiki-based collaborative writing context: attitudes towards technology and application (Thinking), task organization and feedback provision (Doing), modes and genres (Meaning), teacher-student relations (Relating), and roles and responsibilities (Being).
What Types of Photographs Do Teenagers “Like”?
Authors: Greenfield Patricia M. , Evers Noah F. G. , Dembo Josh
Published: October 2017

Instagram is a popular photo-sharing application. Viewers interact with those who post photographs through registering “likes” and making comments. This experiment investigated what kinds of photos teenagers “like.” Two teenagers created and selected photo stimuli of different types and posted them to their existing Instagram accounts. In this way, the authors ensured a high degree of ecological validity. The research design called for 16 photos in each of the following eight categories: peer, romantic relationship, solo activity, selfie, family, violence, nature, and food. In the categories of peer, romantic relationship, solo activity, selfie, and family, half the pictures included the person posting and half did not. Hypothesis 1 states that the pattern of “likes” would reflect adolescent developmental issues: as a group, peer relations, romantic relations, identity formation, and independence from family would receive the most “likes.” Hypothesis 2 states that photos that included the person posting gather more “likes” than photos that did not. Both hypotheses were confirmed by the pattern of “likes” elicited by the posted photographs. Thus adolescent Instagram use, like the adolescent use of other social networking tools, indicates that the same developmental issues are expressed online and offline. The fact that teens prefer Instagram photos in which the person posting appears (as shown by the increased amount of “likes”) indicates that the narcissistic tendencies of creating and editing a social network profile are driven not just by the individual; they are also driven by the audience.
Awareness, Knowledge, and Ability of Mobile Security Among Young Mobile Phone Users
Authors: Yan River
Published: October 2017

The research literature on awareness, knowledge, and ability of mobile security of young mobile phone users was reviewed in this article. The existing literature suggests that young mobile phone users are usually not aware of potential mobile security issues when using a mobile phone. Young mobile phone users are often found to lack the knowledge to detect mobile security problems and to defend themselves in the mobile world. Empirical evidence also exists in which some users do not have the mobile security ability to safely use their mobile phones. Overall, it is vital that young users improve their awareness, knowledge, and ability of mobile security so that they can effectively and enjoyably use their mobile phones.
TODA
Authors: Sanches Cida , Ferreira Jr Samuel , Santos Givaldo , Paixão Marisa Regina , Meireles Manuel
Published: October 2017

This paper describes the use and application of the TODA (Trade-off Decision Analysis) method through a case study. The method uses the concept of trade-off applied to a prioritization matrix and, to define the weights, it takes the concept of causality into account. Studies have shown that the TODA achieves the same results as the competing AHP method. However, it is easier to operate. The methodology used is a case study concerning the choice of the type of car for a fleet of vehicles to be driven by salespeople. Together with the software application process, the methods that aided the weighting of the criteria are described and how the values of the alternatives are converted into coefficients of the objective function. The results clearly show that the method is easily applied, but the limitations of the case study method preclude forming generalizations.
Comparative Performance of Contradictory and Non-Contradictory Judgement Matrices in AHP Under Qualitative and Quantitative Metrics
Authors: Gupta Vishal
Published: October 2017

Over the years, although AHP has proved its success in various diverse fields, many authors in the literature have also shown its shortcomings, often called as criticisms of AHP. One such criticism is allowing the consideration of contradictory judgement matrices. Such matrices violate the principle of ordinal transitivity and thus there does not exist any ranking of corresponding decision elements which satisfy all the judgements. In this paper, the results of our investigation towards measuring this criticism are further explored and discussed by comparing the quality of priority vector of contradictory judgement matrices and non-contradictory judgement matrices under Rank Reversals and the common frame work of “aggregated deviation”. The results further strengthen the notion of contradictory judgement matrices as a strong criticism of AHP for higher order judgement matrices and necessitate some proper avoidance (if not elimination) procedure for them.
Concept Based Censor Production Rules
Authors: Hewahi Nabil M.
Published: October 2017

This paper presents a rule structure called Concept Based Censor Production Rule (CBCPR) that deals with real time cases. CBCPR is an extension of a rule structure called Censored Production Rule (CPR). CPR is a standard rule structure with UNLESS slot, which contains various censor conditions that might rarely happen and prevent the action of the rule to be taken. The more time one has, the more censor conditions one can check. The major extension of CPR is by concentrating on what is called concept. The concept is what about the user needs the decision. Each rule will have a certain concept title that specifies its job. In addition, in every CBCPR structure, at least one slot related to UNLESS part in the rule is existing, where each UNLESS slot is related to a certain category having censor conditions concerned with the concept. The structure will help the system to give more certain answers within the given time for the real-time systems instead of keep checking unnecessary censor conditions for the same concept of different UNLESS categories.
Investments in E-Government
Authors: Fernandes Teresa Matos , Gomes Jorge , Romão Mário
Published: October 2017

The expenses in Information Systems and Information Technology (IS/IT) represent a substantial share in organizations' budgets. However, IS/IT investment projects seem to continue to show reduced success rates. The Benefits Management (BM) has gained relevance as a way, not only, to understand these failures, but also as a tool available to organizations to improve the success of IS/TI investments. The objective of this article is to understand how BM can be applied in IS/IT investments in the Public Administration (PA) and help to leverage the benefits of these investments. A case study was conducted using an e-Government project in the Portuguese PA. The study showed how a BM approach can be applied in this environment and also identified some difficulties that must be considered. Several benefits, that were not foreseen, were identified and evaluated, or proposed some criteria for their evaluation, highlighting, this way, the true contribution of IS/IT investments in delivering services to citizens and increasing public organizations performance.
An Analytical Method to Audit Indian e-Governance System
Authors: Anand Darpan , Khemchandani Vineeta
Published: October 2017

E-Governance is the process of delivering public services to the citizens through the Information and Communication Technology with reliability, transparency and efficiency, without breaking the concept of cost-effectiveness. E-governance saves money, fuel and time of citizens by avoiding the visits of the government offices and on the other hand it saves money of government which is used for office maintenance. Though the concept of e-Governance was started in eighth decade of the 20th century, it entered the second phase (organized / wireless + satellite) in India with NeGP-1.0 in 2006. This article explores the growth and development of e-Governance in INDIA. The authors also present the analysis of the implemented e-Governance projects based on comparison with other regions of the world. Moreover, this paper also identifies the obstacles that need to be overcome to provide seamless access to the government services to the citizens.
English Writing via a Social Networking Platform
Authors: Yu Wei-Chieh Wayne
Published: October 2017

This study examined students' perceptions of completing an English writing class via a social networking platform. Participants were 162 aboriginal students between 18 and 23 years of age at a nursing college in southern Taiwan. Different ethnicities were defined and represented by different memberships of indigenous groups or tribes, also known as the aboriginals. The participants were completing a required English language course and were required to pass an English Proficiency test as an exit requirement of the university. Participants' pretest scores indicated that they had a positive perception of taking a web-based class. At the conclusion of the study, based on posttest scores, students' positive perceptions decreased noticeably for six of the thirteen items on the instrument. The findings of the study also indicated that tribal membership had no significant impact on students' perceptions of completing an English writing class via a predominantly web-based environment.
Using Social Media to Improve Student-Instructor Communication in an Onlinef Learning Environment
Authors: Guo Rong , Shen Yide , Li Lei
Published: October 2017

The lack of effective faculty-student interaction has been identified as a main contributor to the high dropout rate in online education. For this paper, the authors conducted an empirical study using a social networking tool, specifically Facebook, to improve student-instructor communication and student performance in an online learning environment. They recruited three sections of an introductory IT course at a public university and divided them into two groups: (1) a treatment group where Facebook was used as an additional communication tool and (2) a control group where the course setting wasn't changed. The authors surveyed the participants' opinions on the use of Facebook in the treatment group, and collected participants' academic performance data for both the treatment and control groups. Their research findings show that the use of Facebook as a supplemental communication method can help an instructor better reach out to students, reduce a course's failure rate, and improve student course performance.
An Exploratory Study on the Application of Multiple Intelligences to MBA Andragogy with Particular Reference to ERP-Controlling Configuration Course
Authors: Gaikwad Sophia S. , Bharathi S. Vijayakumar
Published: October 2017

The purpose of this study is to elicit the application of Multiple Intelligences (MI) theory to a course taught in the MBA Andragogy. Administered to a sample of 47 students of the first year MBA Information Technology Business Management (ITBM) program at a private university in India the study brought out certain interesting implications. Foremost, the written report, prescribed a clear route map for the preparation and planning of the MI activities to become the SAP ERP-Controlling Configuration course in the MBA (ITBM) program. Second, the administration of the MI Andragogy to the target sample by applying three well-defined tools. Foremost, the MI profile of the students, second, the most preferred MI activity of the student and third, the observation schedule with the instructor. The statistically significant pre and post test scores validated the strength of the work. The third implication is the triangulation of the three tools to ensure the credibility and validity of the results. It was found that a little over 50 percent of the sample resulted in complete corroboration and the balance partially corroborated. Overall the research extends and enhances the scope and application of MI theory to MBA Andragogy and serves every bit a broad citation to the MBA teaching ecosystem.
Secure and Robust Telemedicine using ECC on Radix-8 with Formal Verification
Authors: Kumar Gautam , Saini Hemraj
Published: October 2017

The scalar multiplication techniques used in Elliptic curve cryptography (ECC) are having the scope for gaining the computation efficiency. This is possible through the reduction of precomputed operations. Finding the more efficient technique compares to the most recent or efficient one is a research gap for all schemes. The manuscript presents an application oriented work for Telemedicine using ECC. It is based on robust application on reduced computational complexity. The methodology we apply for the same is Scalar Multiplication without precomputation on Radix-8. Introduced software and the hardware performance are reporting a big advantage over all the related proposed techniques. The reason to cover this problem is to provide a path on a fascinating area of ECC on a smaller key size be applicable for all applications on a same level of security strengths. The smaller length key gives the higher speed and shorter clock cycle to initiate the operation.
Performance Evaluation of SHA-3 Final Round Candidate Algorithms on ARM Cortex–M4 Processor
Authors: Sobti Rajeev , Ganesan Geetha
Published: October 2017

SHA-3 was an open competition initiated by NIST to design new generation of hash functions. This competition was a necessity to overcome the challenges imposed by multiple attacks on MDx family of hash functions including SHA-0 and SHA-1. For this competition, NIST announced a reference platform which did not cover Embedded and Mobile machines. This paper compares the performance of SHA-3 final round candidate algorithms on ARM Cortex-M4 processor (embedded processor) and presents the results. Cycles per Byte is used as performance metric. Cortex-M4 based Stellaris® LM4F232 Evaluation Board (EK-LM4F232) from Texas Instruments is used for performance evaluation.
Teaching Basic Programming Concepts to Young Primary School Students Using Tablets
Authors: Fokides Emmanuel
Published: October 2017

The study presents the results of a project in which tablets and a ready-made application were used for teaching basic programming concepts to young primary school students (ages 7-9). A total of 135 students participated in the study, attending primary schools in Athens, Greece, divided into three groups. The first was taught conventionally. The second was taught using a board game, while the third was taught using tablets and an application. Students' performance was assessed using evaluation sheets. Data analyses revealed that students in the tablets/application group outperformed students in the other two groups in three out of four tests. No age differences were noted. Students' views regarding the application were highly positive. The learning outcomes can be attributed to the combination of the application's game-like features and to the tablets' ease of use. On the basis of the results, educators, as well as policy makers, can consider the use of tablets and mobile applications for teaching basic programming concepts to young primary school students.
A Peer Tutoring-Based Concept Mapping Approach to Improving Students' Learning Achievements and Attitudes for a Social Studies Course
Authors: Chuang Chien-Wen , Hwang Gwo-Jen , Tsai Wen-Jen
Published: October 2017

Concept maps are well recognized as being an effective tool for helping students organize and construct their knowledge. However, previous studies have also indicated the difficulty encountered by young students in concept mapping. Therefore, how to provide an efficient strategy for enhancing students' learning achievement using concept mapping is worth studying. The purpose of this study is to explore the effects of the peer tutoring-based concept mapping approach on students' learning performance. A 5-week experiment was conducted in an elementary school social studies course in southern Taiwan. The participants were two classes of fifth graders. One class was the experimental group consisting of 33 students provided with a computerized concept map learning model based on peer tutoring, whereas the other class was the control group consisting of 32 students learning with a conventional computerized concept mapping approach. It was found that the learning achievements and the concept map scores of the students who learned with the peer-tutoring strategy were significantly higher than those students who learned with the conventional computerized concept mapping approach. Meanwhile, the result also indicated that the innovative approach is significantly helpful for improving the students' learning attitudes and technology acceptance levels.
A Polling-at-Home Approach to Improving Students' Learning Performance
Authors: Sun Jerry Chih-Yuan , Seli Helena , Martinez Brandon , Lin Yu-Yan
Published: October 2017

Plenty-of-Time Teaching (PoTT) is a teaching strategy adopted by teachers to better understand students' learning status through pre-class activities in order to facilitate adjustments to teaching methods. Extending the concept of PoTT, the goal of this study is to explore the impact of Plenty-of-Time Learning (PoTL) on students' self-regulation, test anxiety, cognitive engagement, and learning performance. Participants were 167 students enrolled in an introductory educational psychology class in which the instructor used either PoTL or Just-in-Time Learning (JiTL) strategy. Students who adopted the PoTL strategy engaged in BlackBoard polling question-and-answer activities that helped teachers understand the overall learning status of the students. The study results indicated that the PoTL strategy enhanced student performance. We recommend that when using PoTL in the future, teachers can open up an online discussion platform to help students not only better understand their own learning situation but also improve their learning strategies.
An Optimal Policy with Three-Parameter Weibull Distribution Deterioration, Quadratic Demand, and Salvage Value Under Partial Backlogging
Authors: Singh Trailokyanath , Pattanayak Hadibandhu , Nayak Ameeya Kumar , Sethy Nirakar Niranjan
Published: October 2017

This paper deals with an EOQ (Economic Order Quantity) model for deteriorating items having the following characteristics: 1) Deteriorating items follow a three-parameter Weibull distribution deterioration rate; 2) Shortages are allowed and are partially backlogged; 3) Salvage value of items is incorporated; 4) Demand is deterministic and a time-dependent quadratic function of time. The principal objective of the introduced model is to minimize the average total inventory cost by finding an optimal replenishment policy. The effectiveness of the model is validated with a numerical example and the sensitivity analysis of the optimal solutions to changes in the values of the various parameters associated with the model has been performed.
A Fuzzy Knowledge Based Fault Tolerance Mechanism for Wireless Sensor Networks
Authors: Acharya Sasmita , Tripathy C. R.
Published: October 2017

Wireless Sensor Networks (WSNs) are the focus of considerable research for different applications. This paper proposes a Fuzzy Knowledge based Artificial Neural Network Routing (ANNR) fault tolerance mechanism for WSNs. The proposed method uses an exponential Bi-directional Associative Memory (eBAM) for the encoding and decoding of data packets and application of Intelligent Sleeping Mechanism (ISM) to conserve energy. A combination of fuzzy rules is used to identify the faulty nodes in the network. The Cluster Head (CH) acts as the data aggregator in the network. It applies the fuzzy knowledge based Node Appraisal Technique (NAT) in order to identify the faulty nodes in the network. The performance of the proposed ANNR is compared with that of Low-Energy Adaptive Clustering Hierarchy (LEACH), Dual Homed Routing (DHR) and Informer Homed Routing (IHR) through simulation.
Data Center Regions and Economic Development
Authors: Yülek Murat Ali , Bostancı İhsan , Göksal Koray
Published: October 2017

The amount of data generated worldwide has reached unprecedented levels, and its rate of growth continues to increase exponentially. Brought about by rapid advances in information technologies, as well as changes in lifestyles and business strategies, this explosion in the quantity of data has given impetus to a fast-growing demand for data storage, which, in turn, has paved the way for large-scale data centers. This article addresses the potential economic impact of the construction of a “data center region” in a developing country, using as a case study a development project in Konya, Turkey. The core focus of the analysis is on whether such a data center region could create positive spillovers that trigger further development in a developing region.
Environmental Sustainability
Authors: Hasanuzzaman  , Bhar Chandan
Published: October 2017

The Indian textile industry is significantly contributing to the socio-economic development of the country but is often condemned for adverse environmental impacts. The textile industry encompasses huge consumption of raw material and produces high volume of waste as byproduct. When the waste is released into the environment, it contaminates the environment by polluting air, water, land and soil. The pollution impact of wet processing and fiber production is very detrimental to the environment. Whereas, yarn formation and fabric formation are responsible for heavy noise and dust generation in the workroom. Taking this forward, current study has makes an attempt to present an overview of environmental sustainability status of Indian textile industry and provide necessary suggestions. It is found from the study that pollution impact from fiber formation and wet processing of textiles is spread beyond shop floor but pollution impact of yarn formation and fabric formation are limited to the workroom only. An efficient waste management system can reduce these impacts.
Effect of Demographics on Use Intention of Gamified Systems
Authors: Aydin Gokhan
Published: October 2017

Gamification has become an influential term in diverse fields ranging from education to systems development and marketing. The recent intensifying emphasis is attributable to enabling technologies and successful practical applications used for changing attitudes and increasing engagement. However, relevant academic studies are not wide-spread and this study aims to address this vital research gap. This study is structured to understand the factors affecting intention to use gamified systems and test whether they are affected by gender or age. An online survey study was conducted on a web-based gamified system (EmpireAvenue.com) and following a detailed screening process, a total of 168 fully complete questionnaires were attained. The theoretical model employed was developed upon technology acceptance model (TAM) and modified to incorporate an intrinsic motivation element, namely the “perceived enjoyment” construct. According to the findings, age and gender moderate the relationships between usefulness, ease of use, perceived enjoyment and intention to use the gamified system.
Guidelines for Error Message Design
Authors: Pieterse Hein , Gelderblom Helene
Published: October 2017

The presented study aims to develop a set of guidelines for error message design. A large amount of research is available in the literature on the topic of warning design. The same is not true for error messages. Although some research exists, the design of error messages is not covered to the same extent as warning design. To address this lack of research, a set of guidelines for error message design was developed from the literature regarding error message design, as well as from warning design theory. These guidelines were then evaluated through two usability studies (a heuristic evaluation and individual interviews with users) to determine whether they are valid and effective. The guidelines were refined based on the results of the usability studies. The final set of guidelines can be used to inform the design and development of error messages and facilitate early evaluation of interface prototypes.
Comparative Study of Seismic Ground Motion Parameters in Deep-Cut and High-Fill Engineering before and after Ground Leveling
Authors: Mi Su Ting , Meng Xin Qiu , Huang Xiao Bo
Published: October 2017

Because of lack of flat land, more and more deep-cut and high-fill engineering are being carried out in mountainous areas. The original geological formations are greatly changed by ground leveling. Therefore, it is very important to analyze the seismic parameters before and after ground leveling. In this paper, the seismic motion parameters before and after ground leveling of deep-cut and high-fill engineering are compared by the establishment of seismic response analysis model in different geological conditions. The results show that the peak acceleration and the characteristic period of the response spectrum are lower than those before excavation; But the results change when filling on the foundation of bedrock or the foundation where original cover soil layers have already existed. The peak acceleration and characteristic period of acceleration response spectrum increase more than those ground motion parameters before filling in this site. Besides, when filling in the bedrock site, the peak acceleration magnification tended to decrease, with the increase of the filling thickness, and the characteristic period tended to increase. Therefore, seismic ground motion parameters after ground leveling can be lower than those before ground leveling in excavation area, conversely, ground motion parameters are higher in fill area.
Deformation Behaviors of Dilution Type Cold Patch Asphalt Mixture under Different Stress Modes
Authors: Wang Hai Peng , Zhang Rong , He Zhao Yi , Wang Jian Zhuang
Published: October 2017

In order to comprehensively evaluate the performance of dilution type cold patch asphalt mixture (CPAM), basic performances and deformation behaviors of dilution type CPAM under different stress modes were tested. The compaction performance and stability increasing property of CPAM were tested by rotation compaction test and Marshall stability test. The deformation behaviors of CPAM were tested by rolling test, small beam bending test and penetration shear test. Results show that when the using temperature is below 25°C, the compaction ability of CPAM is affected by temperature. The evaporation rate of organic solvents is slow, and affects the strength growing and rolling deformation behavior. It needs about 10d for the stability of CPAM rising to 3kN. The residue of organic solvents may lead the deformation of CPAM to constantly instability under rolling load. The stretching deformation and penetration shear deformation are affected by temperature. The low temperature and high temperature performance of CPAM is below standard requirements of hot asphalt mixture (HMA).
Analysis of Development Trends in Low Energy Advanced Convergence Building Technology
Authors: Koo Young Duk , Jeong Dae Hyun
Published: October 2017

The purpose of this study is to conduct a technology-level analysis and draw implications regarding the development of low energy advanced convergence building technology by utilizing information in research papers. With this aim, a citation analysis, a technology development stage analysis, a network analysis, and a technology associative map analysis were undertaken. The results showed that countries including the USA and China have carried out much research in the development of low energy advanced convergence building technology, and the technology level was found to have reached the maturity stage. Also, joint research has been conducted by region, and technology development has been done actively through ICT technology convergence such as electric and electronics and information communication. These analyzed results are expected to furnish useful information for strategy building in the development of low energy advanced convergence building technology.
Geotechnical Study on the Use of Sanitized Sewage Sludge in Cover Layers of Solid Waste Landfills
Authors: de Medeiros Paulino Rafael , Costa Carina  Maia Lins , Costa Yuri Daniel Jatoba
Published: October 2017

Giving the current trend of recycling and reutilization residues, sludge reuse has become an environmental, social and economic necessity. A possible destination would be the utilization of sludge as part of cover layer in solid waste landfills. This paper aimed at investigating the geotechnical implications of the addition of domestic sanitized sewage sludge on clayey-silty sand. The sludge was sanitized with hydrated lime, in the proportion of 25% lime and 75% sludge, and held for 90 days in an agricultural greenhouse for its total stabilization. Then, geotechnical tests were conducted using pure soil, pure sanitized sewage sludge and mixtures of these two materials. Three mixtures were tested: 50% soil and 50% sludge, 66% soil and 33% sludge and 90% soil and 10% sludge. The results showed that the sanitized sludge is a coarse-grained material and, its Atterberg’s limits showed the lack of plasticity. Generally, the greater the sludge percentage in the mixture, the bigger the decrease on the shear strength parameters, it also leaves them lighter and more permeable. At the end, the conclusions were that the 10% sludge and 90% soil mixture has shown geotechnical characteristics that allow its utilization as daily and intermediate cover layers. The sludge and the 50% sludge mixture have shown geotechnical properties adequate for their utilization as component in draining sub-layer in final cover layer.
Comparison of Surfactant Performance Using D-LIMONENE According to EO(Ethylene Oxide) Mole Number for Cleaning the Fish Cake Production Process
Authors: Na Young Soo , Lee Hwa Soo , Chang Jin Gyu , Jeong Kap Seop , An Dae Myung
Published: October 2017

The cleaning efficiency of EO (ethylene oxide) 8~9 mole was about 78-80%, it is the best. The highest cleaning efficiency for each EO mole concentration is as follows. The cleaning efficiency was 97% in the surfactant of 4.8% EO 5 mole, the cleaning efficiency was 97% in the surfactant of 7.7% EO 8 mole, and 68% in the surfactant of 7.7% EO 10 mole. The cleaning efficiency was measured using a surfactant with various EO mole. All detergents were tested at 20% surfactant concentration and EO 8 and EO 9 showed the highest cleaning power. In experiments using 8 mole of EO surfactant NPE8, the highest cleaning power was obtained at surfactant concentration of 7.7%. To determine the cause of this, the electrical conductivity of the solution was measured at the concentration of NPE8 at 1.6%, 4.8%, 7.7%, 14.4% and 20%, respectively. After washing the test plate with NPE8, the detergent remaining on the surface of the test plate was analyzed by FT / IR, and it was found that the detergent did not remain.
Study on the Preparation and Characterization of Carboxyl Terminated Poly(L-Lactic Acid) (PLLA) Prepolymers
Authors: Lu Shi Chao , Ke Yang Chuan , Zhou Qian , Meng Zhao Rui , Zhang Guo Liang , Song You Zhi , Hu Xu , Huang Fu Zhi
Published: October 2017

The carboxyl terminated poly (L-lactic acid) (PLLA) prepolymers were prepared via polycondensation of L-lactic acid and 1,6-adipic acid (end capping agent) under the catalyst of stannous octoate. The effects of synthetic condition, such as reaction temperature, amount of catalyst, content of the end capping agent, etc, on the molecular weight of PLLA were discussed. Fourier transform infrared and 1H nuclear magnetic resonance were used to characterize the PLLA prepolymers. The results indicated that the polycondensation was performed under an optimum reaction condition as following: the amount of the catalyst was 500 ppm based on the mass of lactic acid, the amount of the end capping agent was 1% (the molar amount of the lactic acid), and the polymerization temperature was 170 °C. The viscosity-average molecular weight of the product reached 2.826×104 at this polymerization temperature and the yield was 73.34%.
A ZnS-Nanoparticle-Label-Based Electrochemical Codeine Sensor
Authors: Xiong Wei , Wu Su Fang , Liao Fu Sheng , Hong Nian , Fan Hao , Wei Guo Bing
Published: October 2017

Codeine (3-methylmorphine) is an opiate that is widely used to treat mild or moderate pain and cough suppression. It is the second predominant alkaloid in opium with a mild sedative effect. In the present study, we describe an electrochemical sensor for codeine detection by using the DNA aptamers against codeine. In the sensing protocol, a dually-labeled DNA aptamer probe was designed to be labeled at one end with HS, and at its another end with dabcyl as an electrochemical tag to produce electrochemical signal via recognization occurrence. One special electrochemical marker was prepared by modifying ZnS nanoparticle with-cyclodextrins (ab. ZnS-CDs), which employed as electrochemical signal provider and would conjunct with the codeine probe modified electrode through the host–guest recognition of CDs to dabcyl. With codeine adding, aptamer folding allows the ZnS-CDs into soultion that caused an increase of current signal. This sensor has the ability to detect 37pM codeine. Our study demonstrates that the biosensor has good specificity and stability. It can be used to detect codeine.
Design of Axle Gear Box for Tunnel Traction Engine
Authors: Lian Zhen Hong , Yang Zhong Lei
Published: October 2017

The axle gear case in tunnel traction engine is taken as a research object and the rigid-flexible mixture virtual prototype is created by using RomaxDesigner software in this article. Gear profile modification, gear-tooth fatigue strength, bearing life, the static strength and modal of case body are calculated and analyzed by applying load spectrum to the virtual prototype, in which the deformation of transmission system is considered in simulations. The results show that the virtual prototype of axle gear case meets the requirements of mechanical performances.
Structure Design and Analysis of Multi-Stage High Efficiency Linear Pumping Unit
Authors: Wang Sen , Zhao Yang Yang , Yang Xiu Min , Yan Hong Kui , Guo Feng , Ren Yan Long , Li Si Yang , Guo Jia Cheng
Published: October 2017

A multi-section high efficient pumping unit was designed. The pumping unit has a multi-stage structure including forcer part of the use of linear motor and four-stage linear motor extract oil one after another. Consumption can be reduced and the operating efficiency of the machine can be improved. Each component of high efficiency linear pumping unit is introduced. Using power inverter to control pumping unit without complicated equipment and contact limit controller, pumping stroke adjustment can be realized. The control system adopts the vector control, high control precision and anti-interference ability.
Film Cooling Performances at Different Turbulence Intensities Using Conjugate Heat Transfer Analysis
Authors: Prapamonthon Prasert , Xu Hua Zhao , Wang Jian Hua
Published: October 2017

This study presents a numerical investigation of cooling performances of a modified vane of the film-cooled vane reported by Timko (NASA CR-168289) at different mainstream turbulence intensities (Tus). A 3D conjugate heat transfer (CHT) analysis with SST k-ω turbulence model in FLUENT V.15 is used. Three different mechanisms in CHT analysis, i.e. fluid flow, heat convection between solid surfaces and flowing fluid in an external mainstream and internal cooling passages, and heat conduction within the vane structure, are simultaneously considered. Numerical results are conducted in terms of overall cooling effectiveness at Tu=3.3, 10, and 20%. Comparison between overall cooling effectiveness and film effectiveness under adiabatic assumption is discussed at the three Tus, also. The findings of this research indicate the following phenomena: 1) overall cooling effectiveness decreases with Tu, and this effect on the pressure side (PS) is stronger than that on the suction side (SS) in general. 2) By comparison with adiabatic film effectiveness, the level of overall cooling effectiveness in most regions is higher and more uniform than that of adiabatic film effectiveness for all three Tus. 3) In the leading edge (LE), when Tu increases, near the exits of film holes overall cooling effectiveness deteriorates, but adiabatic film effectiveness improves. Furthermore, a large area with relatively low overall cooling effectiveness is able to move with Tu in the LE region.
Study and Design Sailboat Type Dinghy
Authors: Naksrisuk Satawat , Seviset Somchai , Piromgarn Thanate
Published: October 2017

The Objectives of this research are 1) to study the form of Dinghy boat 2) to design a Dinghy boat by using D Ronald K. Kiss Ship’s Iterative Process on Design Spiral, by studying the model’s data of Dinghy sailboats, including related Ideas, theories, and interviews with the yacht racing association of Thailand’s officers. The Purposive Sampling Method as used. After studied the form of the Dinghy boat, the designing process then started by using collected data, through analytical processes with conceptual framework for product design; The Quality Function Deployment, the Theory of Inventive Problem Solving, the Design Spiral which is an iterative Process, and the Reverse Engineering Principle. The experts from both the fields of Industrial Product Design and Sailing Boat, whom concern Dinghy Boat format, were included to evaluate the designing and model constructing process. The statistical methods used were Percentage, Median and Standard Deviation (SD.). The research found that 1) the current type of Dinghy sailboat is still unsafe for novice sailors; It is difficult for practicing, limited on sailor's weight, very difficult to relocate and take care of, it also were built from the expensive materials 2) In designing, the researcher designed the boat's hull by concentrate on its floating center The middle movement, which would have an effect on its floating aspect, which might tilt the boat, to be straight and highly secure. Researcher designed the parts to be able to disassemble and redesign shapes, and use wood as a material for maintenance purpose in accordance with the technical requirements that expected for Dinghy boat, from the Sailing Boat experts under Yacht racing association of Thailand. In the opinions of the honorable experts, the Dinghy Boat type 1 was scored following these factors; Meet the usage demand of the boat (Mean = 3.88, SD. = 0.33) The determination of size and dimension of the boat (Mean = 4.13, SD. = 0.33) The line pattern and shape of the boat ( Mean = 3.88, SD. = 0.33).
Reliability Analysis of the Main-Shaft Device of a Hoist System with Coupling Faults
Authors: Lu Hao , Wang Lei , Tang Chao Quan
Published: October 2017

In this paper, the reliability and reliability sensitivity of the main shaft device of a hoist system is studied. The main purpose of this paper is to provide a modeling method for the joint probability distribution of main shaft device with coupling faults based on the system reliability theory and copula function theory. The stochastic response of the main shaft device is obtained using design of experiment. The reliability of the main shaft device is calculated based on the fourth moment method. The reliability sensitivity is then deduced based on the reliability results. The joint probability of failure between correlated failure modes is estimated based on the Gumbel copula. The system reliability evaluation of the main shaft device is then calculated. A numerical example of a main shaft device is illustrated to validate the application of the proposed method. The method proposed in this study can be provided for the analysis and design of the main shaft device of deep well hoist as a necessary theoretical basis.
Obstacle Avoidance Algorithm for Redundant Manipulators Based on Weighted Generalized Inverse
Authors: Cao Hai Rui , Gu Xiao Qin , Yu Chu Hong
Published: October 2017

In this paper, a gradient projection method for redundant robot manipulators based on weighted generalized inverse was presented. By weighting the Jacobian matrix and gradient, not only the obstacles, but also the joint limits could be avoided. In the process of obstacle avoidance, the evaluation function called danger field measuring the dangerous level between the manipulator and obstacles was used and improved. According to the relationship between the value of danger field and the preset threshold, a smooth and continuous transition between the primary and secondary tasks is allowed. This method was proved to be effective by numerical simulations in Matlab.
Free Vibration Analysis of Symmetric Sandwich Beams
Authors: Ibnorachid Zakaria , El Bikri Khalid , Boutahar Lhoucine
Published: October 2017

The aim of the present work is to study the linear free symmetric vibration of three-layer sandwich beam using the energy method. The zigzag model is used to describe the displacement field. The theoretical model is based on the top and bottom layers behave as Euler-Bernoulli beams while the core layer as a Timoshenko beam. Based on Hamilton’s principle, the governing equation of motion sandwich beam is obtained in order to calculate the linear frequency parameters. Two types of boundary conditions simple supported-simple-supported (SS-SS) and clamped-clamped (C-C) under the influence of materials properties and geometrical parameters are studied. The validation of results is done by comparing with another studies, which available in the literature and found good agreement between the studies.
Life Cycle Assessment of Environmental Impacts and Total Cost of Power Cable
Authors: Hu Ren , Jing Zhao Xia , Wu Qing Hua , Yan Ren Bao , Cao Zhe Cheng
Published: October 2017

For responding the national demand of energy conservation and emission reduction (ECER) and promoting the green purchase of power equipments, it’s highly of importance to perform the analytic process of environmental impacts and total cost in lifetime for power equipments. Life cycle assessment (LCA) is an analytic approach which completely supervises the concerned objective within its life cycle. In this paper the life cycle is hypothetically divided into three main phases, respectively, the production phase, the operation phase and the recycling phase. On the basis of LCA, this study develops a model regarding the environmental impact analysis and total cost calculation for power cable within its life cycle. This model computes the emission level of main pollutants at each stage and illustrates the trend of total cost change with respect to changeable power load parameters. The experimental research indicates that the developed model is practically useful and rational with conclusions. In terms of environmental impacts of power cable, the effect from the production phase mostly lies in the discharge of abundant waste water. And the effect from the operation phase mainly concentrates upon the energy consumption and the emission of greenhouse gas. However, the effect from the recycling phase is very slight. Meanwhile, as for the perspective of total cost of power cable, the operating cost increases obviously as the power load arises.
A Trend Analysis of Smart City Technology Development
Authors: Koo Young Duk , Kwon O Young
Published: October 2017

The purpose of this study is to analyze the trends of smart city technology, which has attracted attention recently in relation to its urban revival functions along with changes in the industrial structure in deprived urban areas, and to draw implications. With this aim, the trends by country and detailed research field were analyzed in this study through a technology level analysis, and the technology growth stage and network analysis were examined by utilizing research paper information published worldwide. From these results, it was determined that smart city technology is likely to be commercialized because recently it has reached a maturity stage, and relevant research has been conducted actively mainly by China, the USA, and major European countries. Through this trend analysis, useful information is presented in this study for establishing R&D strategies to preoccupy the smart city technology field.
Machining Finish of Titanium Alloy Prepared by Additive Manufacturing
Authors: Huang Xin , Bai Qian , Li Yong Tao , Zhang Bi
Published: October 2017

Surface finish plays a critical role in functional performance of machined components. This study investigates machining finish of Ti-6Al-4V alloy prepared by Additive Manufacturing (AM) with a series of slot-milling experiments. The study compares the machined AMed part with that made of the conventional wrought Ti-6Al-4V. The microstructure of AMed parts is acicular α and Widmanstatten α lath structures compared to lamellar α structure of that in the wrought parts. Due to the unique microstructure from AM process, the AMed parts present higher strength and lower ductility. Therefore, a lower surface roughness is obtained in the milling of AMed parts compared to its counterpart of wrought parts. In addition, the machined surface of AMed parts possesses a topography of discontinued ridges. It is believed that the topography is due to low ductility of AMed part. The results show that the machined AMed part presents better surface finish. The study provides a guidance to optimization of machining parameters for AMed Ti-6Al-4V alloys.
On the Plasma Temperature in the Hybrid Plasma-MIG Welding Process
Authors: Sydorets Volodymyr , Korzhyk Volodymyr , Babych Oleksandr
Published: October 2017

In many respects, the advantages of the hybrid welding process Plasma-MIG are explained by the interaction of the arc discharges, which make up it: a plasma discharge and an arc with a consumable electrode (MIG). Knowledge and understanding of the laws of this interaction is very important for the implementation of the process and obtaining good results. The theoretical analysis of the influence of the plasma discharge temperature with non-consumable electrode on the melting of the electrode wire was carried out. The dynamics of the melting of the electrode wire and dynamics of circuit with consumable electrode arc were been investigation. Estimates of the maximum value of the temperature of plasma discharge have been made. These results were used to select welding modes and for carrying out the technological experiments.