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Search Results: 1 - 10 of 5700 matches for " Kuan Yew Wong "
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Band alignment and enhanced breakdown field of simultaneously oxidized and nitrided Zr film on Si
Wong Yew Hoong,Cheong Kuan Yew
Nanoscale Research Letters , 2011,
Abstract: The band alignment of ZrO2/interfacial layer/Si structure fabricated by simultaneous oxidation and nitridation of sputtered Zr on Si in N2O at 700°C for different durations has been established by using X-ray photoelectron spectroscopy. Valence band offset of ZrO2/Si was found to be 4.75 eV, while the highest corresponding conduction offset of ZrO2/interfacial layer was found to be 3.40 eV; owing to the combination of relatively larger bandgaps, it enhanced electrical breakdown field to 13.6 MV/cm at 10-6 A/cm2.
A Genetic Algorithm Approach for Solving a Flexible Job ShopScheduling Problem
Sayedmohammadreza Vaghefinezhad,Kuan Yew Wong
International Journal of Computer Science Issues , 2012,
Abstract: Flexible job shop scheduling has been noticed as an effective manufacturing system to cope with rapid development in todays competitive environment. Flexible job shop scheduling problem (FJSSP) is known as a NP-hard in the field of the optimization problem. Assuming the dynamic state of the real world, make these problems more and more complicated. Most studies in the field of FJSSP have only focused on minimizing the total makespan. In this paper, a mathematical model for FJSSP has been developed. The objective function is maximizing the total profit while meeting some constraints. Considering time-varying raw material and selling price and dissimilar demand for each period, are attempts that have been done to decrease gaps between reality and the model. A manufacturer that produces various parts of gas valves has been used as a case study. The scheduling problem for multi part, multi period, and multi operation with parallel machines has been solved by genetic algorithm (GA). The best obtained answer determines the economic amount of production by different machines that belong to predefined operations for each part to satisfy customer demand in each period.
A Genetic Algorithm Approach for Solving a Flexible Job Shop Scheduling Problem
Sayedmohammadreza Vaghefinezhad,Kuan Yew Wong
Mathematics , 2012,
Abstract: Flexible job shop scheduling has been noticed as an effective manufacturing system to cope with rapid development in today's competitive environment. Flexible job shop scheduling problem (FJSSP) is known as a NP-hard problem in the field of optimization. Considering the dynamic state of the real world makes this problem more and more complicated. Most studies in the field of FJSSP have only focused on minimizing the total makespan. In this paper, a mathematical model for FJSSP has been developed. The objective function is maximizing the total profit while meeting some constraints. Time-varying raw material costs and selling prices and dissimilar demands for each period, have been considered to decrease gaps between reality and the model. A manufacturer that produces various parts of gas valves has been used as a case study. Its scheduling problem for multi-part, multi-period, and multi-operation with parallel machines has been solved by using genetic algorithm (GA). The best obtained answer determines the economic amount of production by different machines that belong to predefined operations for each part to satisfy customer demand in each period.
A Study on the Validation of Green Supply Chain Performance Measures in the Automotive Industry
Ezutah Udoncy Olugu,Kuan Yew Wong
Communications of the IBIMA , 2011,
Abstract: This study was aimed at establishing the validity of the measures and metrics for automobile green supply chain performance measurement. The study involved statistical tests using 16 measures and 72 corresponding metrics. These statistical tests include exploratory factor analysis to investigate the construct validity of the measures and their metrics, a confirmatory factor analysis to test the model fitness and a multiple regression analysis to test the criterion validity of the measures. From the results obtained, the validity of the measures and their corresponding metrics has been established. The paper culminated with recommendations for further studies.
Simulation of Sequencing Rules Using Witness in a Milling Job Shop
Liqi Ang,Kuan Yew Wong,Wai Peng Wong
Communications of the IBIMA , 2011,
Abstract: Simulation is essential when studying manufacturing processes or designing production systems. This project was a real case study which involved a job shop with five similar CNC milling machines. A total of six jobs were performed and each of them consisted of a different set of operations. The sequence of the six jobs to enter the system was determined by the sequencing rules including shortest setup time (SST), shortest processing time (SPT), shortest processing and setup time (SPST), earliest due date (EDD), least process (LP), and lowest volume (LV). The setup time was taken into consideration to make the results more realistic. Due to the complexity of the model, WITNESS was used to simulate all the sequencing rules. The best approach was then determined by comparing the results of each rule. By doing this, the case company would be able to make a better decision on which job should be processed first instead of selecting it randomly among the jobs.
A Comprehensive Approach in Assessing the Performance of an Automobile Closed-Loop Supply Chain
Ezutah Udoncy Olugu,Kuan Yew Wong,Awaludin Mohamed Shaharoun
Sustainability , 2010, DOI: 10.3390/su2040871
Abstract: The ecological issues arising from manufacturing operations have led to the focus on environmental sustainability in manufacturing. This can be addressed adequately using a closed-loop supply chain (CLSC). To attain an effective and efficient CLSC, it is necessary to imbibe a holistic performance measurement approach. In order to achieve this, there is a need to adopt a specific approach for a particular product rather than being generic. Since sustainability has direct environmental footprints that involve organizational stakeholders, suppliers, customers and the society at large, complexities surrounding supply chain performance measurement have multiplied. In this study, a suitable approach has been proposed for CLSC performance measurement in the automotive industry, based on reviewed literature. It is believed that this approach will result in increased effectiveness and efficiency in CLSC performance measurement.
Effects of post-deposition annealing ambient on band alignment of RF magnetron-sputtered Y2O3 film on gallium nitride
Hock Jin Quah and Kuan Yew Cheong
Nanoscale Research Letters , 2013, DOI: 10.1186/1556-276X-8-53
Abstract: The effects of different post-deposition annealing ambients (oxygen, argon, forming gas (95% N2 + 5% H2), and nitrogen) on radio frequency magnetron-sputtered yttrium oxide (Y2O3) films on n-type gallium nitride (GaN) substrate were studied in this work. X-ray photoelectron spectroscopy was utilized to extract the bandgap of Y2O3 and interfacial layer as well as establishing the energy band alignment of Y2O3/interfacial layer/GaN structure. Three different structures of energy band alignment were obtained, and the change of band alignment influenced leakage current density-electrical breakdown field characteristics of the samples subjected to different post-deposition annealing ambients. Of these investigated samples, ability of the sample annealed in O2 ambient to withstand the highest electric breakdown field (approximately 6.6 MV/cm) at 10 6 A/cm2 was related to the largest conduction band offset of interfacial layer/GaN (3.77 eV) and barrier height (3.72 eV).
A Multi-Strand Test for Assessing Year 4 Pupils’ Proficiency in Area Formulae  [PDF]
Chew Cheng Meng, Wun Thiam Yew, Lim Hooi Lian, Wong Sing Ie
Open Journal of Social Sciences (JSS) , 2016, DOI: 10.4236/jss.2016.42003
Abstract:

The objectives of this study are to develop a multi-strand test for assessing Year Four pupils’ proficiency in area formulae and to determine their levels of proficiency in the area formula of a square, rectangle and triangle, respectively. The researchers will employ a cross-sectional survey research design and cluster sampling will be used to select a sample from a population of Year 4 pupils who are studying in all public schools in the state of Penang, Malaysia. However, at this stage of the study, the paper only reports the results of the pilot test involving a sample of sixty- seven Year 4 pupils who have learned the area formulae from a public primary school in Penang. The results of the pilot test indicate that among the five strands of proficiency in each of the area formulae, adaptive reasoning shows the highest percentage of pupils who are not proficient and among the three area formulae, adaptive reasoning in the area formula of a triangle shows the highest percentage of pupils who are not proficient. But, among the five strands of proficiency in the area formula of a square, rectangle and triangle, procedural fluency, conceptual understand- ing and productive disposition show the highest percentage of pupils who are very proficient, respectively. Overall, the area formula of a rectangle shows the highest percentage of pupils who are very proficient (59.7%). But, the area formula of a triangle shows the highest percentage of pupils who are still not proficient (31.3%). The results of the pilot study seem to indicate that the multi- strand test is able to assess the levels of proficiency in the area formula of a square, rectangle and triangle, respectively. The results imply that more attention should be given to the strand of adaptive reasoning in the teaching, learning and assessment of the area formulae in order to improve the pupils’ adaptive reasoning in the area formulae.

A Semi-Elliptical Wideband Phase Shifter
Yew-Chiong Lo;Boon-Kuan Chung
PIER Letters , 2012, DOI: 10.2528/PIERL11102303
Abstract: A new microstrip structure for realization of wideband phase shifter has been designed and fabricated. The proposed design uses edge-coupled semi-elliptical structure and an elliptical defected ground plane to increase the coupling coefficient and operating bandwidth. Simulation performed using CST Microwave Studio and measured results confirm the good performance of the proposed design. The phase deviation is better than ±4o, insertion loss less than 0.6dB and return loss better than 10dB over a wide frequency range. The achievable bandwidth is more than 2.3 : 1.
Chlorido(pentane-2,4-dionato-κ2O,O′)(1,10-phenanthroline-κ2N,N′)copper(II)
Yew Sent Wong,Chew Hee Ng,Seik Weng Ng
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809027111
Abstract: The CuII atom in the title compound, [Cu(C5H7O2)Cl(C12H8N2)], shows a distorted square-planar coordination; the chelating N and O atoms occupy the basal sites and the Cl atom the apical site. The square-pyramidal character along the Berry D3h–C4v pseudorotation pathway is 92%.
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