bluuebunny/crossref_metadata_2025 huggingface dataset:
A Novel Calibration Method for Multi-Hole Pitot Tubes
Authors: Lee Hsin Hung
Published: May 2015

The ANFIS algorithm was first applied to calibration modeling of the multi-hole pitot tube in this study. Owing to its capability of efficient learning, easy implementation and excellent explanation through fuzzy rules, ANFIS can help identify the dominant parameters and construct fuzzy learning system. After determination of the ANFIS structure from the calibration data, the network of pitot tube calibration parameters was established and the correlation among non-dimensional pressure coefficients, flow angle and flow velocity were constructed as well. Meanwhile, the air velocity can be predicted based on the measurements of flow angles and flow angle coefficients. It can reach to a high consistency of 0.0068 with the original data after iteration. Eventually, ANFIS can be integrated with real-time data acquisition system and wind tunnel due to its programmability. A large database consisting of flow properties, flow angles and the non-dimensional pressure coefficients can be efficiently established and will be helpful for shortening the calibration procedures.
Flow Control and Thermal System Design for Wet Cell in the Scanning Electron Microscope
Authors: Lee Cheng Yu , Lee Hsin Hung , Chiang Chun Lin , Tsai Kun Chih , Lin Win Ti
Published: May 2015

This paper describes a novel device, a wet cell, used for observation in the wet environment inside the scanning electron microscope (SEM). A Wet cell is composed of three counterparts, which are flow control system, thermal system and Wet cell body. The flow system provides continuous buffer liquid to wet cell and maintains cells living at the vacuum environment. It can control different flowrates and switch to different fluidics. Additionally, the thermal system can control the temperature inside the wet cell and maintain at 37 °C. It also offers preheating thermal module to lower the fluctuated of wet cell inside temperature. The wet cell body contains a silicon nitride film based observation window and provides a wet environment for observation between vacuum and anti-vacuum status. In this paper, we introduce the structure and experimental data of flow control and thermal system in Wet cell to let SEM easily provide lots of live imaging information such as dynamics of nano-materials and biological samples in the liquid state.
RFID-Based Thermal Convection Non-Floating Type Accelerometer with Stacking Material for Heater and Thermal Sensors
Authors: Lin Jium Ming , Lin Cheng Hung , Lin Chia Hsien
Published: May 2015

This research proposes a wireless non-floating type thermal convection accelerometer, in which the heaters and the thermal sensors were made on the surface of a flexible substrate with a stacking material (such as aluminum nitride with thickness 1mm), this new device is different from those of the traditional floating structures with a grooved chamber in the silicon substrate. Thus one can integrate both a thermal convection accelerometer and a wireless RFID antenna on the same substrate, and this accelerometer is a wireless one and very convenient for fabrication and usage. Besides, the filling gas was changed as xenon to avoid the oxidizing effect that will be produced by the previously used CO2 or air. Thus not only the reliability but the life cycle of the heater can be increased. The performances by using the traditional rectangular chamber for either xenon or CO2 without stacking material had nonlinear effects. But the cases by using a stacking layer and xenon gas are always better. Comparisons with the previous accelerometer with rectangular chamber, stacking material and filled by CO2 are also made (with sensitivity 0.182°C/G), the sensitivity for the new one with hemi-cylindrical chamber, xenon gas and stacking material is better (0.227°C/G) and without nonlinear effect in larger accelerations. The new device can be used in the applications of air bags and munition industry.
Modified Mnet for Performance Improvement in Moodle Learning Management System
Authors: Wang Jin Long , Chueh Shu Ju , Kuo Wen Chu , Lin Yi Ying
Published: May 2015

Moodle is one of the most popular Learning Management System (LMS) in the world. However, this kind of system always suffer the burden of large amount of user connections in a short period of time, such that the front end web servers and the rear end database servers became the bottleneck of the whole system. In the LMS system, the most challenges are to provide the rapid response, the system stability, the system flexibility, the system scalability, and the fault tolerance. Currently, the problems of system overloading are solved by the load balancing scheme, which still have a lot of limitations. In this paper, the proposed scheme, based on the load balancing scheme, combines the mercy of Moodle network scheme and the separate of database in order to improve the performance both on the level of systems and applications for the situation of large amount users. From the performance evaluation, the proposed scheme is superior to the existing system model.
A New Kinect-Based Scanning System and its Application
Authors: Hsieh Cheng Tiao
Published: May 2015

This paper aims at presenting a simple approach utilizing a Kinect-based scanner to create models available for 3D printing or other digital manufacturing machines. The outputs of Kinect-based scanners are a depth map and they usually need complicated computational processes to prepare them ready for a digital fabrication. The necessary processes include noise filtering, point cloud alignment and surface reconstruction. Each process may require several functions and algorithms to accomplish these specific tasks. For instance, the Iterative Closest Point (ICP) is frequently used in a 3D registration and the bilateral filter is often used in a noise point filtering process. This paper attempts to develop a simple Kinect-based scanner and its specific modeling approach without involving the above complicated processes.The developed scanner consists of an ASUS’s Xtion Pro and rotation table. A set of organized point cloud can be generated by the scanner. Those organized point clouds can be aligned precisely by a simple transformation matrix instead of the ICP. The surface quality of raw point clouds captured by Kinect are usually rough. For this drawback, this paper introduces a solution to obtain a smooth surface model. Inaddition, those processes have been efficiently developed by free open libraries, VTK, Point Cloud Library and OpenNI.
A Novel Non-Decreasing Temperature Based Simulated Annealing for Flow Shop Problems
Authors: Chen Ruey Maw , Sandnes Frode Eika
Published: May 2015

The permutation flow shop problem (PFSP) is an NP-hard permutation sequencing scheduling problem, many meta-heuristics based schemes have been proposed for finding near optimal solutions. A simple insertion simulated annealing (SISA) scheme consisting of two phases is proposed for solving PFSP. First, to reduce the complexity, a simple insertion local search is conducted for constructing the solution. Second, to ensure continuous exploration in the search space, two non-decreasing temperature control mechanisms named Heating SA and Steady SA are introduced in a simulated annealing (SA) procedure. The Heating SA increases the exploration search ability and the Steady SA enhances the exploitation search ability. The most important feature of SISA is its simple implementation and low computation time complexity. Experimental results are compared with other state-of-the-art algorithms and reveal that SISA is able to efficiently yield good permutation schedule.
Stress Analysis and Improvement of Extrusion Dies Using Combination of FEM with Taguchi Method
Authors: Chang Kao Hua , Shih Ching Wei , Tzou Gow Yi
Published: May 2015

This study aims at analyzing the influence of the maximum principal stress on Tungsten Carbide Steel die core in an extrusion die which caused the crack of die core, and then adjusts the dies assembly method in order to improve the service life of die. In this study, combining FEM simulation software with Taguchi Method L9(34) is to choose the cobalt content for die core materials, and the quantity of shrink fit while assembling the die core and die case as the reference parameters. When carrying out the simulation process, compared the changes of the maximum principal stress of the die core caused by the plastic deformation of die materials to achieve the minimum expected value as the goal be chosen the most optimal die combination. Then, the results obtained are to make dies in trial and mass-production practically; as a result, it can be achieved that the die life is improved from the original 1000pcs to 150000pcs, which is more 150 times better than before.
A Layered-Rheology Model for Thin Film Elastohydrodynamic Lubrication of Circular Contacts
Authors: Chu Li Ming , Hsu Hsiang Chen
Published: May 2015

The modified Reynolds equation for power-law fluid is derived from the viscous adsorption theory for thin film elastohydrodynamic lubrication (TFEHL) of circular contacts. The lubricating film between solid surfaces is modeled as three fixed layers, which are two adsorption layers on each surface and a middle layer. The differences between classical EHL and TFEHL with non-Newtonian lubricants are discussed. Results show that the TFEHL power law model can reasonably calculate the pressure distribution, the film thickness, and the velocity distribution. The thickness and viscosity of the adsorption layer and the flow index influence significantly the lubrication characteristics of the contact conjunction.
Characteristics of Graphite-Impregnated Resin-Bonded Cubic Boron Nitride Composites
Authors: Tsai Ming Yi , Chen Alan , Chang Hung Jui
Published: May 2015

The wear behaviors of micrographite particles impregnating a cubic boron nitride (CBN) abrasive matrix using resin bonding was presented. CBN composite specimens containing 0.1, 1, and 5 wt% graphite and 50, 75, and 100 CBN concentrations were prepared by compression molding. Three dressing materials—copper, SiC, and Al2O3—were prepared to dress the CBN composite specimens. A carrier was designed and manufactured have a shape similar to that of a grinding wheel in order to hold the CBN composite specimens, which was then attached to the spindle of the grinder to carry out the grinding processes. The worn surfaces of the CBN composites were examined using scanning electron microscopy. Also, the surface characteristics and wear rate of the CBN composite specimens, the material removal rate, and the surface roughness of the SKD11 steel were investigated under dry grinding conditions. The experimental results indicated that there was considerable improvement in the process performance of the graphite-impregnated CBN structure.
Bearing Performance Degradation Signal Simulation Based on Health Confidence Value Injection and FPGA
Authors: Liu Quan Li , Lu Chen , Liu Hong Mei
Published: May 2015

A digital simulation method for the performance degradation signal of rolling bearings is developed based on the analysis of experimental data. A self-organizing map neural network is utilized to build the performance degradation assessment model of the rolling bearings based on characteristic parameter extraction. Wavelet packet decomposition is then implemented to extract the wavelet coefficients in the corresponding performance degradation sensitive band. Different health confidence values are injected into the extracted wavelet packet coefficients, and signals are reconstructed according to the simulation needs to obtain rolling bearing vibration data under different degradation degrees. Understanding the exact mathematical model of the measured object is unnecessary in this method; the method is simple and reliable and helps solve the problem of performance degradation data simulation. Finally, an FPGA-based performance degradation signal simulator is designed by combining the analogy procedure, employed to support the verification process of fault diagnosis and prediction capability.
Chaos and Nonlinear Dynamic Analysis of Porous Air Bearing System
Authors: Wang Cheng Chi , Hung Jui Pin
Published: May 2015

The chaos and nonlinear dynamic behaviors of porous air bearing system are studied by a hybrid numerical method combining the finite difference method (FDM) and differential transformation method (DTM). The numerical results are verified by two different schemes including hybrid method and FDM and the current analytical results are found to be in good agreement. Furthermore, the results reveal the changes which take place in the dynamic behavior of the bearing system as the rotor mass is increased. From the dynamic responses of the rotor center, they reveal complex dynamic behaviors including periodic, sub-harmonic motion and chaos. The results of this study provide an understanding of the nonlinear dynamic behavior of PAB systems characterized by different rotor masses. Specifically, the results have shown that system exists chaotic motion over the ranges of rotor mass 10.66≤ Mr<13.7kg. The proposed method and results provide an effective means of gaining insights into the porous air bearing systems.
Design and Experiment of the Magnetorheological Damper with Multiple Poles
Authors: Shiao Yao Jung , Jow Mei Ling , Kuo Wen Hwa , Nguyen Quang Anh , Lai Chao Wei
Published: May 2015

The main function of a suspension system is to isolate and absorb the impact from road surface to vehicle body. To provide good riding comfort, a damper with variable and wide-range damping is highly needed. This paper presents a complete procedure from design, optimization to experiment for a magnetorheological (MR) damper with multiple poles. This new designed damper is entirely different from those conventional single-pole MR dampers, effectively by extending the range of damping force. Magnetic simulation has been done in the paper to provide an optimal structure of the damper which significantly enhances the damping force while avoids magnetic saturation. The new damper was also manufactured and tested. The experimental results show that the provided damping force can be significantly increased with the increase of input current from low to high speeds. Damping force can be varied by 7.41 times. It proves that this new MR damper with high damping force can be controlled adaptively at wide range of operation conditions. It is suitable to be an adaptively variable damping source in semi-active suspension systems.
Design of 3-Speed Bicycle Transmission Hubs
Authors: Wu Yi Chang , Chen Li An , Wu Tze Cheng
Published: May 2015

This paper presents the embodiment designs of 3-speed transmission hubs which consist of basic planetary gear mechanisms and gear-shifting control mechanisms. Two feasible clutching sequence tables are synthesized by analyzing the kinematic structure of the gear mechanism. A mechanical control mechanism is used to control the engagement or disengagement of each clutch to guide the power flow from the rear sprocket via the gear mechanism to the hub shell. The power transmission path at each gear stage is further checked to verify the validity of the transmission hub. The embodiment designs of two 3-speed transmission hubs are presented.
Design of Cam Mechanisms with a Translating Follower Having Symmetrical Rollers
Authors: Hsieh Jung Fa
Published: May 2015

The pressure angle is one of the primary considerations in designing a cam mechanism since an inappropriate angle may cause excessive sliding loads on the follower. This paper presents a simple yet straightforward method for the design and analysis of a cam mechanism with a translating follower having double rollers. In the proposed approach, conjugate surface theory is employed to derive a kinematic model of the cam mechanism. Analytical expressions for the pressure angle is then derived. The validity of the analytical expressions is confirmed by machining a designed cam using a 3-axis CNC machine tool
Design of Novel Hydrodynamic Grooved Journal Bearing with Dual-Layer Herringbone-Grooved Patterns
Authors: Liu Chien Sheng , Lee Min Kai , Chuo Ying Chi
Published: May 2015

Due to that the load capacity of the conventional herringbone-grooved cylindrical journal bearing (HGJB) decreases significantly with a decreasing dimension, a requirement exists for miniature HGJB with high load capacity in miniaturized spindle motor applications. This paper investigates the design and characterization of a novel HGJB using dual-layer herringbone-grooved patterns for small spindle motors and cooling fans. In contrast to conventional HGJBs, the proposed HGJB contains another set of herringbone-grooved pattern on its outer surface. The performance of the proposed HGJB is characterized numerically using flow field analysis software. Results show that compared to the conventional HGJB presented by the current group in a previous study, the proposed HGJB can improve the load capacity by 53.7% of the previous value.
Design of the Cooling Module of LEDs Based on the Aluminum-Acetone Flat Plate Heat Pipe
Authors: Cheng Po Jen , Lin David T.W. , Wang Chi Chang , Liu Wu Man , Chang Chai Wei
Published: May 2015

The waste heat generated by high power LEDs is hardly effectively dissipated, therefore, it results in a serious problem in the luminous efficiency. The most important issue of the LED research is to find a potential design of heat removal and solve the problem of LED over-heating. The purpose of this study is to design the LEDs combined with the cooling module of the aluminum-acetone flat plate heat pipe by the experiment for the high efficiency of heat removal. The aluminum-acetone flat plate heat pipe is innovative proposed by our team. The high power LEDs with and without heat pipe cooling module is compared. The heat removal efficiency of the cooling module of the aluminum-acetone flat plate heat pipe reaches 77% and drops the junction temperature of LED about 36 °C. The cooling module of the aluminum-acetone flat plate heat pipe has proven to be effective in solving the heat concentration problems associated with the LED chips. In short, the phase change cooling module will apply on the electronic component of high heat concentration for more effective cooling method.
Effective Numerical Analysis Method for Roll-to-Roll System Having the Large Nonlinearity Property
Authors: Hong Sung Ham , Choi Juh Wan , Rhim Sung Soo , Choi Jin Hwan
Published: May 2015

In the Roll-to-Roll (R2R) system, the design and development for a roller path and control system are mainly performed by the expert’s experience. There are some important issues in the numerical analysis method of R2R system. This study proposes an efficient R2R system analysis method. The first one is the Approximated Winding Length Estimation (AWLE) algorithm which can calculate the analytic winded length of the workpiece. The core winder is approximated with line and arc segments in this algorithm. As a result, in the numerical model of R2R system, we can replace the winder characteristics with the approximated winding length estimation (AWLE) algorithm. The second one is the contact algorithm between workpiece and rollers. This contact algorithm must be stable and fast for precise analysis. The third one is the flexible workpiece model. The workpiece can be modeled by the finite elements. By implementing these some important issues, this paper proposes an efficient R2R system analysis method.
Feature Extraction Technology for Rolling Bearings Based on Local Tangent Space Alignment
Authors: Wen Zhi , Lu Chen , Liu Hong Mei
Published: May 2015

Health assessment and fault diagnosis for rolling bearings mostly adopt traditional methods, such as time-frequency, spectral, and wavelet packet analyses, to extract the feature vector. These methods are suitable for processing data with a linear structure. However, for the non-linear and non-stationary signal, the result of these methods is not ideal. Thus, this study proposes a suitable method to extract the feature vector in nonlinear signals. Local tangent space alignment of a manifold algorithm is employed to extract the feature vector from the rolling bearings. Results verify the advantage of the manifold algorithm for non-linear and non-stationary signals.
Compensating for Creep Effects in One-Indent Nanoindentation Tests
Authors: Huu Hung Nguyen , Wei Pal Jen , Lin Jen Fin
Published: May 2015

Detailed observations of nanoindentation static creep effects exhibited in polymethylmethacrylate (PMMA) is presented and discussed in this study. One-indent nanoindentation technique, the partial unloading measurement (PUM) method, is compared with the basic measurement BM method (i.e., an array of multiple single indents with various magnitudes). The experimental results for PMMA reveal a strong dependence on the loading conditions. It was found that the PUM results for PMMA are not consistent with the corresponding BM results due to significant static. The creep depths accumulated and increased the indentation depth, and thus the contact area. The hardness and elastic modulus evaluated from these experimental results decreased with the indentation depth (or load).The effect of static creep exhibited in polymers for the PUM method during the determination of mechanical properties was studied. A significant static creep effect was found for polymers when the indentation load was held in order to attenuate the rapid direction change between the loading and unloading segments.
Finite Element Analysis on Natural Properties of a Micro Drill with Ultrasonic Vibration
Authors: Huang Bo Wun , Chen Wu Tsan , Tseng Jung Ge
Published: May 2015

Finite element analysis on natural properties of a micro drill with ultrasonic vibration is considered to study. Because getting smaller aperture in the printed circuit board (PCB), it tends to be more severe due to vibration. The vibration has adverse effects to machining accuracy and surface roughness which will increase tool abrasion and further accelerate the destruction from material fatigue. There are many ways to produce perforations, such as laser micro-machining and micro-drilling. The industry still adopts micro drill piercing process due to the cost and technical considerations. In order to enhance the cutlery life and the quality of the drilling process, the cutting characteristic of bur is important. Hence, the vibration during drilling must be suppressed. This study is to investigate the natural properties of a micro drill under ultrasonic vibration (50 kHz) excited with a piezoelectric-driven actuator and numerically by using finite element analysis.
Nonlinear Transient Finite Element Analysis for Rifle’s Power Transmission Mechanism with Structure Coupling Effects
Authors: Deng Shi Gan , Sun Huai Ku , Chiu Chung Jung
Published: May 2015

This study uses a nonlinear transient finite element method (FEM) to simulate the mechanism and structural behavior of a 5.56 mm rifle’s multi-body power transmission system after being fired. Specifically, this study uses the Vallier-Heydenreich formula to calculate the chamber pressure, and uses the result as the input loading for the FEM model. The analysis in this study considers elastic deformation, joint clearance, and impact effects. The proposed simulation is capable of simultaneously obtaining the kinematic status, transient stresses, and strain history of a rifle. The results of shooting experiments verified the accuracy of the numerical model. The difference in the bolt carrier’s operation cycle between experimental and numerical data was only 1.9%, indicating that this simulation method is credible.
Real-Time Reliability Evaluation and Life Prediction for Bearings Based on Normalized Individual State Deviation
Authors: Gan Zu Wang , Lu Chen , Liu Hong Mei , Shan Tian Min
Published: May 2015

Most of the existing methods for bearing real-time reliability evaluation employ real-time transformation of traditional reliability indices, performance degradation trajectory analysis, and performance degradation distribution, which are usually limited in terms of accuracy and applicability. A method for real-time reliability evaluation and life prediction for bearings based on normalized individual state deviation is proposed in this study. First, a self-organizing map neural network is utilized to obtain the individual state deviation of a running rolling bearing. Second, individual state deviation is normalized into a state deviation degree, which is used to formulate a modified real-time reliability model for the realization of real-time reliability evaluation and residual life prediction. The proposed method combines population information with real-time monitoring information of individual bearings, and thus avoids the negligence of the real-time transformation of the monitored individual. The errors caused by the randomness of the individual bearing operational process are also reduced. Finally, the feasibility and efficiency of the proposed method is validated by performing run-to-failure experiments on bearings.
The Study on the Innovation Bicycle Design Using Functional Element Characteristics
Authors: Liu Nien Te , Wu Chang Tzuoh , Lin Yung Chun
Published: May 2015

The design method on bicycle’s functional elements proposed by this research is based on analysis on the winning work in the Global Bicycle Design Competition. Via analyzing its creative design on functional elements, our study is aimed to establish a creative design method on bicycle for designers to develop lots of creative ideas at the concept development stage. This research is divided into three stages, including analysis on bicycle’s creative design elements, construction of creative design method flow on bicycle’s functional elements, and case study on design prototype. For analysis on bicycle’s creative design elements, we have come up with a symbol table of bicycle’s creative functional elements (CFEs). As to construction of creative design method flow on bicycle’s functional elements, we first asked the designer to describe his/her design theme, and then picked bicycle’s CFEs according to the contents described. After CFEs were picked, we then conducted the space position arrangement of functional element symbols. Based on designer’s requirements, we produced several kinds of space arrangements on CFEs, and then we designed a new bicycle by referring to the symbol table of bicycle’s CFEs acquired. In the final step, we followed the flowchart of bicycle’s CFEs constructed by this research, and proceeded a case study prototype design.
Theoretical and Experimental Investigation of Molecular Spring Isolator
Authors: Yu Mu Chun , Chen Qian , Gao Xue
Published: May 2015

A molecular spring isolator which consists of water and hydrophobic zeolites as working medium is investigated. When the isolator undergoes periodic excitation, water intrudes into hydrophobic pores of zeolites depending on the external pressure and extrudes from the pores as hydraulic pressure decreases. As a result, molecular spring absorbs, releases and dissipates mechanism energy. To obtain the stiffness properties of molecular spring isolator, the mechanics modal of water column intruding into a hydrophobic pore is established utilizing force equilibrium. Subsequently, the process of water infiltrating large numbers of hydrophobic pores is explored. Then the quasi-static experiment is carried out to validate the theoretical modal. It is found that the molecular spring exhibits high static and low dynamic stiffness. Finally, the effect of quantity of zeolites and temperature on stiffness of molecular spring is investigated experimentally.
Calculation of Combination Coefficient and Drag Coefficient for the Throwing Materials of Inertial Rotary Vibrating Screen
Authors: Jiang Jing , Wang Cui Zhu , Liu Shu Ying , Wen Bang Chun
Published: May 2015

The structural characteristics and the working principle of inertial rotary vibrating screen are introduced in this paper. The inertial rotary vibrating screen is a kind of high efficient equipment for the screening classification of dry and wet fine materials. It has the features of simple and compact structure, convenient installation and disassembly, stable work operation, no sieve pore blocking, high screening efficiency, and the whole machine closure without polluting environment. The nonlinear vibration equations of inertial rotary vibrating screen are established, considering the nonlinear forces of materials. An approximate solution and the material combination coefficient and drag coefficient for the vibration equations are solved by equivalent linearization method of nonlinear theory. A calculation example is also given in this paper.
A Compact Dual-Band MIMO Antenna for WLAN Applications
Authors: Chuang Ching Song , Ku Tsi Tsu , Lin Ming Chun
Published: May 2015

This paper presents a compact dual-band MIMO antenna that is compatible to the IEEE 802.11n wireless LAN standards. The MIMO antenna contains two tree-type elements placed back to back with distance of one-sixth wavelength of 2.4GHz; the element in the MIMO antenna is structured with a two-branch tree-type planar inverted-L monopoles, the lengths in both branches are set to the electrical quarter-wavelength of the frequency bands of 5.2GHz and 2.4GHz respectively. The MIMO antenna characterized by small size, low mutual coupling effect and nearly omni-directional coverage in radiation pattern make it entirely applicable to the mobile wireless network applications. The measurement results of the fabricated MIMO antenna demonstrate the success of the suggested design topologies.
Balancing for Lead-Acid Batteries of Electric Motorcycles
Authors: Liu Van Tsai , Chen Jhih Rong
Published: May 2015

For high-power applications such as electric motorcycles, batteries in series to provide the required voltage is fairly common. The 48V is 12V connected four cells in series for lead-acid batteries of electric motorcycles. After charging and discharging of lead-acid batteries several times, the voltages are often imbalance. Without proper protection, may cause an excessive discharge of lead-acid batteries for early damage. Therefore, lead-acid battery module requires a simple balance circuit to improve battery life in order to avoid over-voltage or under-voltage condition occurs. Energy balance circuit to improve lead-acid battery module matching problems, make the safety and cycle life of lead-acid batteries to improve. This research intends to complete balanced circuit design of lead-acid batteries.
High Pumping Gain Dickson Charge Pump Using Improved Bootstrapped Technique
Authors: Chen Yung Chin
Published: May 2015

This paper proposed an improved bootstrapped type high-efficient charge pump circuit based on the Dickson charge pump in order to get a higher pumping efficiency. It is not only avoid the threshold voltage drop in conventional Dickson charge pump circuits but enable them to generate a higher output voltage. Simulation by HSPICE shows that for conventional Dickson charge pump, it convert the input low DC-voltage (Vin=1.5V) up to 3.8 times of it (VOUT=5.77V), the pump efficiency was 76.93%. Our work, however, can convert the low input DC-voltage (Vin=1.5V) up near to 4.76 times of it (VOUT=7.14V), the pump efficiency can reaches as high as 95.2%.
Microstructural Transformation of Titanium-Boron Carbide (B4C) Powder Mixture during Spark Plasma Sintering
Authors: Balaji V.S. , Kumaran S.
Published: May 2015

Present study investigates the microstructural evolution and in-situ formation of Ti/(TiB+TiC) composite. The sintered compacts are having near theoretical density. The relative density of Ti/(TiB+TiC) composites decreases with increasing TiB and TiC content.The phase evolutions of TiB and TiC according to the in-situ reactions are analyzed by X-Ray diffraction technique (XRD). Optical microscope (OM) and Energy dispersive spectroscope (EDS) observations of the Ti/(TiB+TiC) composites shows the presence of TiC and TiB reinforcements as equiaxed and needle like structures respectively.
Hybrid Analog/Digital Modulations Using Polarization Multiplexing OCDMA Scheme in Free Space Optics
Authors: Yen Chih Ta , Liu Chia Yu
Published: May 2015

With the development of the Internet, how to provide a high-speed and high-security comprehensive network has become urgent issue. In this project, we propose hybrid analog/digital transmissions format scheme which integrated optical code-division multiple-access (OCDMA) and polarization multiplexing technique in free space optics (FSO) transmission. Orthogonal frequency division multiplexing (OFDM) transmits as the analog format and (on-off keying) OOK transmits as digital format in the study, respectively. In the proposed hybrid OCDMA system, it has high-speed transmission, signal security and low cost...etc. we adopt quasi-orthogonal Walsh-Hadamard codes (WHC) that with fixed cross correlation value as the codeword for each base station. With the property, the multiple access interference (MAI) can be efficiently eliminated by using the balanced detection scheme at the receive end. The constellation and eye diagrams show that both OFDM signal as analog signal and OOK modulation as digital signal in the proposed hybrid OCDMA system perform good performance in FSO transmission.
Simulation of P-Type Doping Profile Prediction Using Different Ion Implantation and Diffusion Model
Authors: Ningaraju Vivek , Pramudyo Antonius Fran Yannu , Sheu Gene , Kurniawan Erry Dwi , Yang Shao Ming , Ma Jia Wei , Subramanyaj Subramanyaj
Published: May 2015

Ion implantation and subsequent diffusion are very essential stages in today's advanced VLSI (Very Large Scale Integration) semiconductor devices processing. High precision calibration of device simulation is a key procedure to ensure simulation is accurate. For this purpose, accurate prediction of the doping profiles resulted from ion implantation and diffusion will be studied using a few models of ion implantation and diffusion. We collected data of Boron as P-type ion implantation profiles using TCAD simulation software with different ion implantation models and diffusion models then compared with Secondary Ion Mass Spectrometry (SIMS) data of ion implantation profile database as experimental data. Models plays very important role in this calibration. In this paper, calibrations have done using Monte Carlo and Taurus analytical as implantation model and pd.full, pd.fermi and pd.5stream as diffusion model. All calibration simulations were simulated using Synopsys TCAD Simulation. The experimental results shown by using Monte Carlo ion implantation model with pd.5str diffusion model is close to SIMS profile.
Using Wavelet Hybrid Self-Organizing Feature Map Network for V-I Based Multiple Harmonic Sources Classification
Authors: Huang Cong Hui , Lin Chia Hung , Huang Chung Chi , Wang Chia Hung
Published: May 2015

This paper proposes a method using non-linear voltage-current characteristics for multiple harmonic sources classification using wavelet hybrid neural network (WHNN). Typical voltage-current characteristics of harmonic sources are non-linear closed curves in the time-domain, referring to the converters, reactors, and non-linear loads. The hybrid neural network is a two-subnetwork architecture, consisting of wavelet layer and a self-organizing feature map (SOFM) network connected in cascade. The effectiveness of the proposed method is demonstrated by numerical tests. The results of multiple harmonic sources show the computational efficiency and accurate classification.
Localization Experiments Based on Inertial Sensors for Navigation Applications
Authors: Chiou Yih Shyh , Tsai Fuan
Published: May 2015

Robust and accurate positioning systems with seamless outdoor and indoor coverage have been receiving a great deal of attention. In outdoor environments, as radio signals transmitted from base stations or satellites are jammed or shielded, to estimate an accurate location using only the absolute positioning scheme remains a difficult problem regarding location accuracy. In order to overcome the drawback of the ranging scheme based on the radio signals, this paper presents a positioning approach based on inertial-measurement-unit (IMU) observations to estimate the location of a mobile terminal (MT). For the location-estimation technique, the positioning experiment is handled by the dead-reckoning (DR) algorithm. By processing the observations from the IMU, it is possible to estimate the movement of an MT (car). In terms of the IMU-based approach, although the experimental results demonstrate that the positioning scheme using the DR algorithm causes the error propagation, the approach can work in short period of time for navigation applications.
Implementation of Smart Home with Multi-Channel Technology
Authors: Cheng Chia Hsin , Ho Chung Ching , Lin Yeh Wei
Published: May 2015

In this paper, we propose a Smart-Home system with ZigBee Wireless Sensor Networks (WSNs) technology. The system provides automation system in the House. The monitor system uses Andriod NDK and SDK to write application interface for an Android embedded platform. In this system, we provide access control system to obtain sensor data and inquiry into node status. We use multi-channel architecture to reduce a hidden terminal problem and upgrade packet delivery ratio.
New Cold Forging Process of Retaining Pin Using FEM Based Simulation
Authors: Hsia Shao Yi , Chou Yu Tuan
Published: May 2015

Retaining pins are generally used as the parts of automobile gears, axes, crankshafts, and seat belts, which are proceeded three-stage forming and then drilling processing in the original manufacturing procedure. However, the fixture seizing in the drilling processing could result in rod surface damage and dent, and the depth tolerance exceeding the drawing specifications after the drilling causes the major defects in product manufacturing. This study attempts to modify the cold forging process by adding one stage and replacing the original mechanical drilling processing with backward extrusion and forging engineering. In the research process, Finite Element Method is utilized for analyzing and simulating the forming load at each stage. The analysis results show that increasing the original 3-stage forging process to 4-stage could assist in solving the problems of rod dent and depth tolerance exceeding the drawing specifications after the drilling. Although the die cost would increase with an increasing stage, the new process allows the forging force being more even and the die life being prolonged, in consideration of the overall production costs.
Robust H∞ Control for Takagi-Sugeno Fuzzy Systems with Time-Varying Delays in State and Input
Authors: Tsai Shun Hung , Jian Siou An
Published: May 2015

In this paper, the robust H∞ stabilization problem for Takagi-Sugeno fuzzy control systemswith state and input delays is explored. Based on a Lyapunov-Krasoviskii function, the delaydependentstabilization conditions are proposed in terms of linear matrix inequalities (LMIs) to guaranteethe asymptotic stabilization of time-delay Takagi-Sugeno fuzzy systems with disturbance input.Finally, a numerical example is illustrated to demonstrate the feasibility and effectiveness of the proposed stabilization.
Robust Output Observer-Based Control of Neutral Uncertain Systems with Discrete and Distributed Time Delays
Authors: Chen Jenq Der , Wu I Te , Lee Chin Tan , Chen Ruey Shin , Yang Chyi Da
Published: May 2015

In this paper, the robust control problem of output dynamic observer-based control for a class of uncertain neutral systems with discrete and distributed time delays is considered. Linear matrix inequality (LMI) optimization approach is used to design the new output dynamic observer-based controls. Three classes of observer-based controls are proposed and the maximal perturbed bound is given. Based on the results of this paper, the constraint of matrix equality is not necessary for designing the observer-based controls.
Designing FIRA Medium-Sized Soccer Robot Vision System Using Particle Swarm Optimization
Authors: Chen Ching Yi , Ko Chi Chiang
Published: May 2015

Enabling FIRA medium-sized soccer robots to recognize target objects according to color information requires that competing teams manually set the range of colors according to ambient lighting conditions prior to games. This color information is used to differentiate features of target objects, such as the ball, the goals, and the field. Constructing a color-feature model such as this is extremely time-consuming and the resulting model is unable to adapt dynamically to changes in lighting conditions. This study applied a look-up table method to execute RGB-HSV color space conversion to accelerate video processing. A particle swarm optimization (PSO) scheme was developed to detect the color-feature parameters of the target objects in the HSV color space. This enables the automatic completion of color-feature modeling and the construction of the knowledge model required by the robot for object recognition. Experiment results demonstrate that the proposed method is capable of enhancing the robustness of the robot vision system in determining changes in lighting conditions. In addition, the manpower and time required to set robot parameters prior to games were reduced significantly.
Development of a Tracking System on the Mobile Robot
Authors: Su Kuo Lan , Guo Jr Hung , Hsia Kuo Hsien
Published: May 2015

The purpose of this paper is to develop an intelligent mobile robot using image processing technology. The mobile robot is composed of a visual tracking system, a loading platform, a balance control system, a PC-based controller, four ultrasonic sensors and a power system. We develop a PC based control system for image processing and path planning. The mobile robot can track a moving target and adjust the loading platform by the balance control system simultaneously. The Image processing based on OpenCV use two different tracking methods, MTLT (Match Template Learning Tracking) and TLD (Tracking, Learning and Detection), to track moving targets. The efficiencies of both methods for tracking the moving target on the mobile robot are compared in this paper. The loading platform control system uses HOLTEK Semiconductor Company's HT66F Series 8-bit microprocessor as the processor, and receives the feedback data from the FAS-A inclinometer sensor. The controller of the loading platform uses the PID control law according to the feedback signals of the inclinometer sensor, and controls the rotation speed of the platform motor to tune the balance level. Keywords— Intelligent mobile robot, Image processing, OpenCV, MTLT, TLD, HOLTEK, FAS-A inclinometer sensor, PID control.
Development of Orthogonal Electric Steering Loading System
Authors: Zhang Jie , Yu Zu Yao , Lou Su Hua
Published: May 2015

Based on the model of electric direct drive motor, the development of a steering loading system is presented, and the effect of the rotation speed and system rigidity on the surplus torque of a certain steering loading system is analyzed. Compromising system rigidity is needed both to buffer the surplus torque caused by target motion and to maintain system bandwidth and responsibility.
Integration of 3G Wireless Image Transmission System with the Aerial Search and Rescue UAV
Authors: Zou Jie Tong , Wang Chi Yi , Wang Yue Min , Lu Ming Cong , Ren Hong Yan , Qiu Yi Jia
Published: May 2015

With the rapid development of unmanned aerial vehicles (UAV), the applications of the UAV are more and more extensively, and one of the important applications is aerial search and rescue. Using the UAV for search and rescue can save cost and avoid the risk of personal injury. Nowadays, the UAV usually use analog 1.2GHz, 2.4GHz or 5.8GHz real-time video transmission system. Because of the limited transmission bandwidth, the maximum resolution is only 640*480, which is not enough for aerial search. It is difficult to search and identify the small target by this aerial image with only 640*480 resolutions. Because the mobile devices and 3G base stations are widespread, this research integrated the UAV with a mobile device to perform time lapse photography App. The high resolution (2688*1520 pixels) photo can be transmitted to the cloud server via 3G network. The GCS (ground control station) can receive these high resolution photos from cloud servers. With these high resolution aerial photos, the rescued targets can be found and identified more easily. Using the EXIF (Exchangeable image file format) information of the aerial photo, the GPS coordinate of the target can be acquired.
Using Laser Range Finder Obstacle Avoidance and Using TLD Positioning System of Mobile Robot
Authors: Guo Jr Hung , Su Kuo Lan
Published: May 2015

Robot self-localization and obstacle avoidance has been one of the important topics in robotics. The sensing system which is more mature and using a laser range finder (LRF). But the biggest drawback is the LRF detection range is a plane, And for some high reflectivity of the object, will produce incorrect reflection data. So when the obstacle is not the detection range, or due to high reflectance data will generate an error and the positioning of the robot obstacle avoidance function error. This paper is the use of TLD (Tracking-Learning-Detection) image recognition system, to assist LRF do positioning and obstacle avoidance. And this imaging system can also be used while the robot with object tracking functions
Nonlinear Dynamic Characteristics of Magnetic Shape Memory Alloy Actuator
Authors: Zhu Zhi Wen , Li Xin Miao , Xu Jia
Published: May 2015

A kind of hysteretic nonlinear model of magnetic shape memory alloy (MSMA) was developed in this paper, and the nonlinear dynamic characteristics of MSMA actuator were investigated. Van der Pol nonlinear item were introduced to interpret the hysteretic phenomena of strain-magnetic field intensity (MFI) curves of MSMA, and the constitutive relationship among strain, stress and MFI was obtained in partial least-square regression method to describe the variation of strain-MFI curves with stress. The result of significance test shows that all of the items in the constitutive model are significant, and the result of forecast test shows that the model can describe the hysteretic nonlinear characteristics of strain-MFI curves of MSMA in different stress well. Based on the MSMA model, the magneto-mechanical coupled model of MSMA actuator was developed, and the relationship between input magnetic signal and output displacement was obtained. The nonlinear dynamic characteristics of MSMA actuator were discussed, and phenomena of accuracy aggravation of MSMA actuator in high-frequency magnetic field were explained. Finally the theoretical results were proved by experiment. The new MSMA model has simple form and is easy to be analyzed in theory, which is helpful for the application of MSMA actuator in engineering fields.
Computer-Aided Dynamic Analysis and Simulation of Multibody Manufacturing Systems
Authors: Hwang Yunn Lin , Cheng Jung Kuang , Truong Van Thuan
Published: May 2015

This paper presents simulation of multibody manufacturing systems with the support of numerical tools. The dynamic and cybernetic characteristics of driving system are discussed. Simple prototype models of robot arm and machine tool’s driving system are quickly established in Computer Aided Design (CAD) software inwhich the whole specification of material, inertia and so on are involved. The prototypes therefore are simulated in RecurDyn- a Computer Aided Engineering (CAE) software. The models are driven by controllers built in Matlab/Simulink via co-simulation. The results are suitable with theory and able to exploied for expansion of complexly effective factors. The research indicates that dynamic analysis and control could be done via numerical method instead of directly dynamic equation creation for multibody manufacturing systems.