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Underground Space 2022年第6期7卷 967-989页

作者： kok-Kwang Phoon Jianye Ching Zijun Cao Singapore University of Technology and Design 487372Singapore Dept of Civil Engineering Taiwan UniversityTaipeiTaiwan 10617China State Key Laboratory of Water Resources and Hydropower Engineering Science Institute of Engineering Risk and Disaster PreventionWuhan UniversityWuhan 430072China

The purpose of this paper(presented online as a keynote lecture at the 25th Annual Indonesian Geotechnical Conference on 10 Nov 2021)is to broadly conceptualize the agenda for data-centric geotechnics,an emerging field that attempts to prepare geotechnical engineering for digital *** agenda must include(1)development of methods that make sense of all real-world data(not selective input data for a physical model),(2)offering insights of significant value to critical real-world decisions for current or future practice(not decisions for an ideal world or decisions of minor concern to geotechnical engineers),and(3)sensitivity to the physical context of geotechnics(not abstract data-driven analysis connected to geotechnics in a peripheral way,i.e.,engagement with the knowledge and experience base should be substantial).These three elements are termed“data centricity”,“fit for(and transform)practice”,and“geotechnical context”in the *** that a knowledge of the site is central to any geotechnical engineering project,datadriven site characterization(DDSC)must constitute one key application domain in data-centric geotechnics,although other infrastructure lifecycle phases such as project conceptualization,design,construction,operation,and decommission/reuse would benefit from data-informed decision support as *** part of DDSC that addresses numerical soil data in a site investigation report and soil property databases is pursued under Project *** principle,the source of data can also go beyond site investigation,and the type of data can go beyond numbers,such as categorical data,text,audios,images,videos,and expert *** purpose of Project DeepGeo is to produce a 3D stratigraphic map of the subsurface volume below a full-scale project site and to estimate relevant engineering properties at each spatial point based on actual site investigation data and other relevant Big Indirect Data(BID).Uncertainty quantification is necessary,as curr

关键词： Data-centric geotechnics Bayesian machine learning Data-driven site characterization(DDSC) Project DeepGeo Data-informed decision support index

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Reinforcement learning models for scheduling in wireless networks

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Frontiers of Computer Science 2013年第5期7卷 754-766页

作者： kok-Lim Alvin YAU Kae Hsiang KWONG Chong SHEN Faculty of Science and Technology Sunway University Selangor 46150 Malaysia R&D Department Recovision Selangor 47650 Malaysia College of Information Science and Technology Hainan University Haikou 570228 China

The dynamicity of available resources and net- work conditions, such as channel capacity and traffic charac- teristics, have posed major challenges to scheduling in wire- less networks. Reinforcement learning （RL） enables wire- less nodes to observe their respective operating environment, learn, and make optimal or near-optimal scheduling deci- sions. Learning, which is the main intrinsic characteristic of RL, enables wireless nodes to adapt to most forms of dynamicity in the operating environment as time goes by. This paper presents an extensive review on the application of the traditional and enhanced RL approaches to various types of scheduling schemes, namely packet, sleep-wake and task schedulers, in wireless networks, as well as the advantages and performance enhancements brought about by RL. Addi- tionally, it presents how various challenges associated with scheduling schemes have been approached using RL. Finally, we discuss various open issues related to RL-based schedul- ing schemes in wireless networks in order to explore new re- search directions in this area. Discussions in this paper are presented in a tutorial manner in order to establish a founda- tion for further research in this field.

关键词： reinforcement learning scheduling wireless networks

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Material characterization and inter/intra-particle validation for DEM simulation of urea coating process

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Particuology 2024年第5期88卷 32-48页

作者： Salma A.Nouh KuZilati KuShaari Lau kok Keong Shafirah Samsuri Chemical Engineering Department Universiti Teknologi PETRONAS32610 Seri IskandarPerak Darul RidzuanMalaysia

Particle coating is a common operation in the controlled-release fertilizer (CRF) industry,where a coating layer is appliedto the urea cores.A discrete element method (DEM) computer simulation was applied to model the coating process for the urea granules using measured model *** accuracy of DEM input parameters for the coating material properties and the physical and mechanical characterizations of urea granules are crucial to the study of particle coating ***,to enhance the simulation accuracy,information on the material properties (urea granules) is *** this study,the elasticity parameters,shear modulus ,coefficient of restitution (CoR),and coefficient of rolling and static friction (CoRF) and (CoSF) of urea granules are estimated experimentally in addition to the physical *** sensitivity of the angle of repose of the urea bed was investigated at different coefficients of *** to the obtained experimental value of the angle of repose,values of 0.2 and 0.3 for CoRF and CoSF,respectively,were adjusted to obtain consistent urea granules’ motion for simulation and the ***,the spray droplet sizes and velocity distributions were estimated using the video-imaging process *** on this experimental characterization,elasticity parameters and spray properties were integrated into DEM simulation software as input data to perform numerical analysis of the coating process to compare simulation and experimental results,which show uniformity at three different pan speeds with a maximum deviation of 0.033 at 5 ***,consistency between DEM and experiment results was achieved in terms of average coating thickness (μm) of the selected samples and average intra-particle thickness variation ( CoV intra ).These results revealed that the coating film thickness is proportional to the rotation speed for the experiment and *** enhance the inter-particle coating uniformity,the effects of the

关键词： Contact model Discrete element method Urea fertilizer Coating process

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用于生物仪器的压电式超声波电动机控制系统设计

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微特电机 2005年第7期33卷 33-35,39页

作者：谢瑜 tan kok Kiong 集美大学福建厦门361009 National University of Singapore singapore117576

根据压电式超声波电动机响应快、运行安静等特点设计了一套可用于生物医学实验的微机控制的压电式超声波电动机高精度闭环位置控制系统。在控制算法上采用PI控制算法,既实现高精度的定位需要,又方便非专业实验人员在实验时进行微调。硬... 详细信息

根据压电式超声波电动机响应快、运行安静等特点设计了一套可用于生物医学实验的微机控制的压电式超声波电动机高精度闭环位置控制系统。在控制算法上采用PI控制算法,既实现高精度的定位需要,又方便非专业实验人员在实验时进行微调。硬件组成简单,便于超声波电动机在其它领域的推广应用。

关键词：超声波电动机 ICSI 位置控制

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Energy Efficient Window Control Scheme for IEEE 802.11ah （Wi-Fi HaLow） Based Networks

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Journal of Electrical Engineering 2017年第5期5卷 242-252页

作者： Yanru Wang kok Keong chai Yue Chen John Schormans School of Electronic Engineering and Computer Science Queen Mary University of London London UK

IEEE 802.11ah brings in Restricted Access Window （RAW） to decrease contention, which is the grouping-based MAC protocol. The way to group a large number of devices and application of RAW size would have influence on the energy efficiency in the process of medium access and communications. In this paper, we study an efficient window control algorithm to improve the uplink energy efficiency with a novel retransmission scheme that utilises the next empty slot for retransmission in the uplink. The grouping scheme is based on the college admission game. The problem is formulated based on energy efficiency by probability theory and Marker chain. To optimise energy efficiency, a window control scheme is proposed to group the devices and set the adaptive window size （number of slots per RAW and internal slot interval） based on the number of groups, applications and the distance between devices and Access Point （AP）. The optimal solution is derived by Gradient Descent approach. Simulation results show that our proposed algorithm outperforms existing one on uplink energy efficiency and fairness.

关键词： IEEE 802.1 lah MAC RAW uplink energy efficiency grouping adaptive window.

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Impregnation of carbonaceous nanofibers into glassy polymer-based composite membrane for CO_2 separation

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Chinese Journal of Chemical Engineering 2018年第11期26卷 2385-2390页

作者： Pannir Selvam Murugiah Pei Ching Oh kok Keong Lau CO_2 Research Centre Institute of Contaminant ManagementChemical Engineering DepartmentUniversiti Teknologi PETRONAS

The development of defect-free composite membrane(CM) is often challenging due to poor dispersion and distribution of filler particles in the polymer matrix. Despite the attractive physicochemical properties and gas separation performance of carbon nanotube(CNT) based CM, CNT displayed poor dispersion characteristics in most polymer matrix domain. Instead of incorporating CNT, a viable alternative, carbon nanofiber(CNF) which exhibits similar properties as CNT, but improved dispersion quality in the polymer matrix is found. In this work,CNF particles were incorporated in poly(2,6-dimethyl-1,4-phenylene oxide)(PPOdm) polymer continuous phase for CM development. The optimum gas separation performance of the PPOdm-CNF CM(11.25 at 197.02 barrer of CO_2 permeability) was obtained at 3 wt% of CNF loading. Compared to pristine PPOdmmembrane,CO_2 permeability and CO_2/CH_4 selectivity of PPOdm-3 wt% CNF CM were enhanced by 180% and 55%, *** 3 wt% CNF loading, the filler particles were dispersed and distributed more homogenously, in which no obvious CNF agglomeration was observed. In addition, the incorporation of CNF particles also enhanced the mechanical and thermal properties of the resultant CM.

关键词： Carbon nanofiber Composite membrane Carbon dioxide Gas separation

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Design concept development of a variable magnetization motorwith improved efficiency and controllable stiffness for roboticapplications

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Science China(Technological Sciences) 2019年第1期62卷 39-46页

作者： BAI Kun ZHU Lang YUAN Mi LEE kok-Meng State Key Lab of Digital Manufacturing Equipment and Technology Huazhong University of Science and Technology Woodruff School of Mechanical Engineering Georgia Institute of Technology

A variable magnetization(VM) motor by incorporating magnets that can be flexibly configured with variable magnetization process is proposed to meet the emerging requirements on motor efficiency and actuator compliance in robotic applications. A generalized spin torque model is established which provides a relationship between the motor torque and two different types of motor inputs, the current inputs and the magnet magnetizations. Avariable magnetization process is proposed based on the study of the hysteresis properties of the magnetic materials and the design criteria for implementing the variable magnetization process with current pulses are established. The feasibility of the variable magnetization is validated with experimental data and the motor functions and performances are numerically demonstrated and evaluated. The results show that the VM motor can maintain high efficiency by switching between two actuation modes. Controllable stiffness at different equilibria can be also achieved with the VM motor with instantaneous magnetizing current pulses.

关键词： compliant actuators direct-drive motors variable stiffness motors variable magnetization motors

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Smart Instrumentation in Video Streams Using Real-time Bit-rate Adaptation

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Instrumentation 2020年第1期7卷 1-12页

作者： KYAW Ko Ko Htet tan kok Kiong Department of Electrical and Computer Engineering National University of SingaporeSingapore 117583

With the proliferation of video traffic across the Internet and wireless networks,various compression standards for videos have emerged over the past two *** them,Motion Joint Photographic Expects Group(M-JPEG)offers the advantages of no frame-to-frame error propagation,less computation cost,and achieving a short latency in both encoding and ***,the bit-rate of M-JPEG stream is variable due to its dynamic frame size,and that leads to adverse outcomes such as inducing different quality-of-service(QoS)grades from servers and networks and inducing disturbances in a real-time network *** paper proposes a novel approach that can control bit-rate and also the individual frame size of M-JPEG video stream in *** results are provided to show that the proposed approach is amenable to direct,straightforward implementation and yet outperforms similar existing approaches in regulating the bit-rate and the frame size of M-JPEG streams.

关键词： Adaptation M-JPEG Video Streaming

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Need for surveillance of concomitant peripheral artery disease in patients with coronary disease: results of the AGATHA survey in Malaysia

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Journal of Geriatric Cardiology 2007年第4期4卷 195-199页

作者： Kui Hian Sim kok Han Chee Inderjit Singh Choon Kiat Ang HoungBang Liew Kim Heung tan Omar Ismail Department of Cardiology Sarawak General Hospital Sarawak Malaysia Department of Cardiology Universiti Malaya Medical Centre Petaling Jaya Malaysia Department of Cardiology Penang General Hospital Penang Malaysia

Background For patients with cardiovascular disease (CVD), co-existence of peripheral artery disease (PAD) predicts increased mortality, and such patients are also more likely to benefit from aggressive therapy. Surveillance of PAD is often neglected at health clinics. Our aim is to highlight the importance and ease of surveillance of PAD in patients with CVD. Objective To determine the prevalence of symptomatic and asymptomatic PAD in a Malaysian patient population with documented CVD. Methods and Results A total of 393 subjects with established CVD were recruited from three centres (85 women and 308 men), as part of a larger international (AGATHA) survey. PAD, determined by presence of claudicant symptoms on interview and/or abnormal ankle-brachial index (ABI) score of less than 0.9, was present in 21.4% of patients-of whom 64% were asymptomatic. Abnormal ABI is associated with higher systolic blood pressure and number of arterial beds affected. Conclusions Concomitant PAD is prevalent among CVD patients in Malaysia. ABI screening is simple and yields a high proportion of patients with extensive atherosclerosis who may require more aggressive atherosclerotic risk management.(J Geriatr Cardiol 2007;4:195-199.)

关键词： arteriosclerosis atherothrombosis Malaysia cardiovascular diseases epidemiologic factors anklebrachial index peripheral arterial disease

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Endoscopic surgery- exploring the modalities

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World Journal of Gastrointestinal Surgery 2015年第11期7卷 326-334页

作者： Daniel Jin Keat Lee kok-Yang tan Department of Surgery Khoo Teck Puat Hospital

The adoption of endoscopic surgery continues to expand in clinical situations with the recent natural orifice transluminal endoscopic surgery technique enabling abdominal organ resection to be performed without necessitating any skin incision. In recent years,the development of numerous devices and platforms have allowed for such procedures to be carried out in a safer and more efficient manner, and in some ways to better simulate triangulation and surgical tasks(e.g., suturing and dissection). Furthermore, new novel techniques such as submucosal tunneling, endoscopic full-thickness resection and hybrid endo-laparoscopic approaches have further widened its use in more advanced diseases. Nevertheless, many of these new innovations are still at their pre-clinical stage. This review focuses on the various innovations in endoscopic surgery, with emphasis on devices and techniques that are currently in human use.

关键词： Transanal total mesorectal excision Natural orific

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