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Journal of Modern Power Systems and Clean Energy 2021年第1期9卷 199-209页

作者： Muhammad Najwan Hamidi Dahaman Ishak Muhammad Ammirrul Atiqi Mohd Zainuri chia ai ooi Tarmizi Tarmizi the School of Electrical and Electronic Engineering Universiti Sains MalaysiaNi-bong TebalMalaysia the Department of Electrical Electronic and System EngineeringUniversiti Kebangsaan MalaysiaBangiMalaysia the Department of Electrical Engineering University Syiah KualaBanda AcehIndonesia

In this paper, a perturb and observe(P&O) based voltage regulator(POVR) and a capacitor compensator(CC)circuit are proposed for the implementation on 31-level asymmetrical switch-diode based multi-level DC-link(MLDCL) inverter. Since the application of MLDCL in a standalone photovoltaic(PV) system requires constant DC voltages from PV panels, the POVR strategy is deployed to regulate the voltage along with the capability to deliver the maximum power at full *** DC-DC converters are used as the interface between the panels and the inverter for the POVR operation. The results show that POVR is capable of achieving the desired fixed DC voltages even under varying environmental and load conditions,with a steady 230 V at the output. At full load, the standalone system successfully delivers 97.21% of the theoretical maximum power. Additionally, CC is incorporated to mitigate voltage spikes at the output when supplying power to inductive *** successfully eliminates the spikes and also reduces the total harmonic distortion(THD) of output current and voltage from more than 10% to less than 5%, as recommended in IEEE 519 standard.

关键词： Multi-level inverter photovoltaic(PV)system maximum power point voltage regulator capacitor compensator(CC)

A review of image processing and quantification analysis for solid oxide fuel cell

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Energy and ai 2024年第2期16卷 464-482页

作者： Kar Shen Tan Chee Kiang Lam Wee Choon Tan Heap Sheng ooi Zi Hao Lim Faculty of Electrical Engineering&Technology Universiti Malaysia PerlisPauh Putra CampusPauh02600PerlisMalaysia Faculty of Mechanical Engineering&Technology Universiti Malaysia PerlisPauh Putra CampusPauh02600PerlisMalaysia Faculty of Information Science&Technology Universiti Kebangsaan MalaysiaBangi43600SelangorMalaysia

The purpose of this study is to investigate the approaches applied to analyze solid oxide fuel cell (SOFC) microstructural properties. Both manual and automated image processing approaches applied on SOFC microstructural images which are obtained from several types of tomography such as dual-beam focused ion beam with scanning electron microscopy (FIB-SEM), Electron Backscatter Diffraction (EBSD) and others are discussed. In fact, to achieve a realistic and accurate SOFC microstructural properties, such as average diameter, volume fraction, triple phase boundary (TPB), area interface density and tortuosity factor, the approaches of image processing and quantification are crucial for a reliable image generation for quantification purposes. The microstructural properties are optimized to improve SOFC electrode performance. Therefore, the image processing and quantification approaches are outlined and reviewed. Despite the automated image processing and quantification algorithms significantly outperform manual image processing and quantification approaches in terms of computing speed when evaluating and measuring microstructural properties, the efficiency and productivity are still extremely taken into concern. As a result, image processing and quantification approaches are concluded and presented respectively in this paper.

关键词： Digital image processing Deep learning Triple phase boundary Solid oxide fuel cell Microstructure

Mitochondrial therapeutics and mitochondrial transfer for neurodegenerative diseases and aging

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Neural Regeneration Research 2025年第3期20卷 794-796页

作者： Neville Ng Michelle Newbery Nicole Miles Lezanne ooi Molecular Horizons and School of Chemistry and Molecular Bioscience University of WollongongWollongongNSWAustralia

Mitochondrial dysfunction and neurodegeneration:Progressive neurodegenerative diseases affect a significant proportion of the population;in a single year,there are as many as 276 million disabilities and 9 million dea... 详细信息

关键词： degenerative diseases Mitochondrial

Q-switched giant pulsed erbium-doped all-fiber laser with V_(2)ZnC MAX phase saturable absorber

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Optoelectronics Letters 2024年第6期20卷 321-329页

作者： Kawther M Musthafa Azura Hamzah ooi Wei Ling Ahmad Haziq aiman Rosol Norliza Mohamed Sulaiman Wadi Harun Malaysia-Japan International Institute of Technology Universiti Teknologi MalaysiaKuala Lumpur 54100Malaysia Razak Faculty of Technology and Informatics Universiti Teknologi MalaysiaKuala Lumpur 54100Malaysia Department of Electrical Engineering University of MalayaKuala Lumpur 50603Malaysia1

MXenes,drawn from MAX phases,are special two-dimensional substances with numerous advantages in nonlinear optics,specifically in giant and ultrashort pulsed-laser ***_(3)C_(2)T_(x)and Ti_(2)CT_(x)nanosheets however rapidly deteriorate under ambient conditions,limiting their *** paper demonstrates how excellent modulation depth of one of the MAX phase compounds vanadium zinc carbide(V_2ZnC)makes it a brilliant saturable absorber(SA)in passively Q-switched all-fiber pulsed lasers,integrated such that a 16.73-μm V_(2)ZnC-polyvinyl alcohol(PVA)thin film acts as SA in the *** and non-saturable absorptions were found to be 13.2%and 10.47%,while saturation optical intensity and modulation depth were 6.25 k W/cm^(2)and 12.43%,respectively,illustrating the optical *** superiority of MAX-PVA,fabricated in four distinct ratios,was demonstrated by the fact that it self-starts a giant pulsed laser at pump power as low as 22.5 mW and firmly accomplished 120.6 kHz repetition rate with a pulse width of 2.08μ*** is a fine SA for the use of pulsed-laser production using all-fiber laser due to fabrication simplicity and great optical,thermophysical,and mechanical qualities.

关键词： MAX Q-switched giant pulsed erbium-doped all-fiber laser with V_(2)ZnC MAX phase saturable absorber

The Application of Knowledge Management(KM)by Small and Medium-Sized Enterprises(SME)in Manufacturing Industry

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Proceedings of Business and Economic Studies 2024年第4期7卷 293-299页

作者： Danrui Yin Chin Lye ooi University of Wollongong Malaysia Shah Alam 40150SelangorMalaysia

To accelerate the digital transformation of small and medium-sized manufacturing enterprises(SMEs),this study delves into the primary challenges encountered in adopting knowledge management(KM)within these organizations and identifies the essential methods for successful *** objective is to provide practical recommendations for the effective adoption of *** research suggests that enterprises should promote knowledge management through three key approaches:enhancing employees’cognitive understanding,standardizing knowledge systems,and tailoring business scenarios to meet diverse *** findings offer valuable insights into the digital transformation of SMEs in the manufacturing sector,ultimately helping these businesses to remain competitive and innovative in a rapidly changing *** addressing the specific needs and challenges faced by SMEs,this study aims to contribute to a more comprehensive understanding of how knowledge management can be leveraged to drive digital transformation and improve overall business performance.

关键词： Knowledge management(KM) Small and medium-sized enterprises(SME) Manufacturing industry

NeurDB: an ai-powered autonomous data system

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Science China(Information Sciences) 2024年第10期67卷 129-150页

作者： Beng Chin ooi Shaofeng Cai Gang CHEN Yanyan SHEN Kian-Lee TAN Yuncheng WU Xiaokui XIAO Naili XING Cong YUE Lingze ZENG Meihui ZHANG Zhanhao ZHAO School of Computing National University of Singapore College of Computer Science and Technology Zhejiang University Department of Computer Science and Engineering Shanghai Jiao Tong University School of Information Renmin University of China School of Computer Science and Technology Beijing Institute of Technology

In the wake of rapid advancements in artificial intelligence(ai), we stand on the brink of a transformative leap in data systems. The imminent fusion of ai and DB(ai×DB) promises a new generation of data systems, which will relieve the burden on end-users across all industry sectors by featuring ai-enhanced functionalities, such as personalized and automated in-database ai-powered analytics, and selfdriving capabilities for improved system performance. In this paper, we explore the evolution of data systems with a focus on deepening the fusion of ai and DB. We present NeurDB, an ai-powered autonomous data system designed to fully embrace ai design in each major system component and provide in-database ai-powered analytics. We outline the conceptual and architectural overview of NeurDB, discuss its design choices and key components, and report its current development and future plan.

关键词： ai$\times$DB in-database ai intelligent data system

High-speed GaN-based laser diode with modulation bandwidth exceeding 5 GHz for 20 Gbps visible light communication

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Photonics Research 2024年第6期12卷 1186-1193页

作者： JUNFEI WANG JUNHUI HU CHAOWEN GUAN YUQI HOU ZENGYI XU LEIHAO SUN YUE WANG YUNING ZHOU BOON S.ooi JIANYANG SHI ZIWEI LI JUNWEN ZHANG NAN CHI SHAOHUA YU CHAO SHEN School of Information Science and Technology Fudan UniversityShanghai 200433China Peng Cheng Laboratory Shenzhen 518000China ZGC Institute of Ubiquitous-X Innovation and Applications Beijing 100876China Photonics Laboratory King Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Saudi Arabia

Visible light communication(VLC)based on laser diodes demonstrates great potential for high data rate maritime,terrestrial,and aerial wireless data ***,we design and fabricate high-speed blue laser diodes(LDs)grown on c-plane gallium nitride(GaN)*** was achieved through active region design and miniaturization toward a narrow ridge waveguide,short cavity length,and single longitudinal mode Fabry–Perot laser *** fabricated mini-LD has a low threshold current of 31 mA and slope efficiency of 1.02 W/A.A record modulation bandwidth of 5.9 GHz(−3dB)was measured from the *** the developed mini-LD as a transmitter,the VLC link exhibits a high data transmission rate of 20.06 Gbps adopting the bit and power loading discrete multitone(DMT)modulation *** corresponding bit error rate is 0.003,satisfying the forward error correction *** demonstrated GaN-based mini-LD has significantly enhanced data transmission rates,paving the path for energy-efficient VLC systems and integrated photonics in the visible regime.

关键词： communication diode waveguide

大数据网络及相关技术在学生违纪问题方面的应用(英文)

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电子器件 2024年第2期47卷 509-517页

作者：冯洁心南琳芝姚瑶 YEOH Sarah Siew Yan LEE Xun ooi Zheng Yi 陕西科技大学镐京学院经济贸易学院陕西西安西安交通大学公共政策与管理学院陕西西安马来西亚理科大学计算机学院槟城牛汝莪11800马来西亚

校园安全与学生校内违纪问题近年来关注热度逐渐上升,随着数智时代的到来,应对和防范学生违纪问题的措施越来越多,当前广泛使用的视频监控和校园一卡通等相关技术有一定的局限性,无法有效地防范违纪问题的发生,因此,通过三种场景将物联... 详细信息

校园安全与学生校内违纪问题近年来关注热度逐渐上升,随着数智时代的到来,应对和防范学生违纪问题的措施越来越多,当前广泛使用的视频监控和校园一卡通等相关技术有一定的局限性,无法有效地防范违纪问题的发生,因此,通过三种场景将物联网与可安装在校园内的传感器连接起来,及时收集和处理数据,实现低能耗、广覆盖、低成本的数据处理并将数据上传到云端,通过MapReduce在云端进行数据处理,根据不同的违纪行为产生预警,使大数据技术与校园霸凌、旷课、吸烟等违纪识别相结合,为学校工作人员监控学生记录和安全问题提供有价值的信息。

关键词：物联网云数据校内违纪

Delineating nuclear reprogramming

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Protein & Cell 2012年第5期3卷 329-345页

作者： Jolene ooi Pentao Liu Wellcome Trust Sanger Institute Hinxton CB101SAUnited Kingdom Agency for Science Technology and ResearchSingapore 138632Singapore

Nuclear reprogramming is described as a molecular switch,triggered by the conversion of one cell type to *** key experiments in the past century have provided insight into the field of nuclear *** deemed impossible,this re-search area is now brimming with new findings and *** this review,we aim to give a historical perspective on how the notion of nuclear reprogram-ming was established,describing main experiments that were performed,including(1)somatic cell nuclear transfer,(2)exposure to cell extracts and cell fusion,and(3)transcription factor induced lineage ***,we focus on(4)transcription factor induced pluripotency,as initiated by a landmark discovery in 2006,where the process of converting somatic cells to a pluripotent state was narrowed down to four tran-scription *** conception that somatic cells possess the capacity to revert to an immature status brings about huge clinical implications including per-sonalized therapy,drug screening and disease *** this technology has potential to revolu-tionize the medical field,it is still impeded by technical and biological *** review describes the effervescent changes in this field,addresses bottle-necks hindering its advancement and in conclusion,applies the latest findings to overcome these issues.

关键词： nuclear reprogramming naïve pluripotency

A study of influence of gravity on bulk behaviour of particulate solid

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Particuology 2008年第6期6卷 467-474页

作者： Yun-Chi Chung Jin Yeam ooi Department of Civil and Environmental Engineering Nanya Institute of Technology Institute for Infrastructure & Environment School of Engineering & Electronics University of Edinburgh

This paper examines the influence of gravity on the bulk responses of a granular solid. The loading scenarios in this study include confined compression, rod penetration into a granular medium and discharging through an orifice. Similar loading and flow conditions are likely to be encountered in the stress and deformation regimes that regoliths are subjected to in extraterrestrial exploration activities including in situ resource utilisation processes. Both spherical and non-spherical particles were studied using the discrete element method （DEM）. Whilst DEM is increasingly used to model granular solids, careful validations of the simulation outcomes are rather rare. Thus in addition to exploring the effect of gravity, this paper also compares DEM simulations with experiments under terrestrial condition to verify whether DEM can produce satisfactory predictions. The terrestrial experiments were conducted with great care and simulated closely using DEM. The key mechanical and geometrical properties for the particles were measured in laboratory tests for use in the DEM simulations. A series of DEM computations were then performed under reduced gravity to simulate these experiments under extraterrestrial environment. It was found that gravity has no noticeable effect on the force transmission in the confined compression case; the loading gradient in the rod penetration is linearly proportional to the gravity; the mass flow rate in silo discharge is proportional to square root of the gravity and the angle of repose increases with reducing gravity. These findings are in agreement with expectation and existing scientific evidence.

关键词： Extraterrestrial Particulate assembly Confined compression Rod penetration Silo discharge Discrete element method Gravity effect