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Adaptive and scalable load balancing for metadata server cluster in cloud-scale file systems

Frontiers of Computer Science 2015年第6期9卷 904-918页

作者： Quanqing xu Rajesh Vellore ARUMUGAM Khai Leong Yong Yonggang WEN yew-soon ong Weiya XI Data Storage Institute Agency for Science Technology and Research Singapore 138632 Singapore School of Computer Engineering Nanyang Technological University Singapore 639798 Singapore

Big data is an emerging term in the storage indus- try, and it is data analytics on big storage, i.e., Cloud-scale storage. In Cloud-scale （or EB-scale） file systems, load bal- ancing in request workloads across a metadata server cluster is critical for avoiding performance bottlenecks and improv- ing quality of services. Many good approaches have been pro- posed for load balancing in distributed file systems. Some of them pay attention to global namespace balancing, making metadata distribution across metadata servers as uniform as possible. However, they do not work well in skew request dis- tributions, which impair load balancing but simultaneously increase the effectiveness of caching and replication, in this paper, we propose Cloud Cache （C2）, an adaptive and scal- able load balancing scheme for metadata server cluster in EB-scale file systems. It combines adaptive cache diffusion and replication scheme to cope with the request load balanc- ing problem, and it can be integrated into existing distributed metadata management approaches to efficiently improve their load balancing performance. C2 runs as follows： 1） to run adaptive cache diffusion first, if a node is overloaded, load- shedding will be used; otherwise, load-stealing will be used; and 2） to run adaptive replication scheme second, if there is a very popular metadata item （or at least two items） causing a node be overloaded, adaptive replication scheme will be used,in which the very popular item is not split into several nodes using adaptive cache diffusion because of its knapsack prop- erty. By conducting performance evaluation in trace-driven simulations, experimental results demonstrate the efficiency and scalability of C2.

关键词： metadata management load balancing adaptivecache diffusion adaptive replication cloud-scale file systems

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优化场景视角下的进化多任务优化综述

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计算机应用 2024年第5期44卷 1325-1337页

作者：赵佳伟陈雪峰冯亮候亚庆朱泽轩 ong yew-soon 重庆大学计算机学院重庆400044 大连理工大学计算机科学与技术学院辽宁大连116024 深圳大学计算机与软件学院广东深圳518060 南洋理工大学计算机科学与工程学院新加坡639798

随着优化问题变得日益复杂,传统的进化算法由于计算成本高昂和适用性有限而面临挑战。为了克服这些挑战,基于知识迁移的进化多任务优化(EMTO)算法应运而生,它的核心思想是通过跨任务的知识共享,同时解决多个优化问题,旨在提高进化算法... 详细信息

随着优化问题变得日益复杂,传统的进化算法由于计算成本高昂和适用性有限而面临挑战。为了克服这些挑战,基于知识迁移的进化多任务优化(EMTO)算法应运而生,它的核心思想是通过跨任务的知识共享,同时解决多个优化问题,旨在提高进化算法在应对复杂优化场景的效率。全面总结了当前进化多任务优化研究的进展,与已有综述文章相比,从不同的研究视角进行深入探讨,并指出了现有文献中对优化场景视角分析的缺失。鉴于此,从优化问题的应用场景出发,对适用于进化多任务优化的场景及其基本解决策略进行了系统性的阐述,以帮助研究人员准确地根据具体应用需求选择合适的研究方法。此外,深入讨论进化多任务优化当前面临的挑战和未来的研究方向,旨在为未来的研究提供指导和启示。

关键词：进化算法进化多任务优化知识迁移复杂优化问题

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快速负荷波动下支持最优潮流的进化型多任务处理架构（英文）

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南方电网技术 2017年第10期11卷 103-114页

作者： L. P. M. I. Sampath Abhishek Gupta yew-soon ong H. B. Gooi 南洋理工大学跨学科研究生学院新加坡639798 南洋理工大学计算机科学与工程学院新加坡639798 南洋理工大学电机与电子工程学院新加坡639798

电力系统运行规划主要使用以小时为单位运行的机组组合。目前,可再生能源在用户侧的渗透率越来越高,导致电力系统负荷产生巨大波动。因此,为了维持电力系统运行的经济性和安全需求、确保电力供应的可靠性,我们有必要进行以小时为间隔的... 详细信息

电力系统运行规划主要使用以小时为单位运行的机组组合。目前,可再生能源在用户侧的渗透率越来越高,导致电力系统负荷产生巨大波动。因此,为了维持电力系统运行的经济性和安全需求、确保电力供应的可靠性,我们有必要进行以小时为间隔的最优潮流计算,并且考虑各种可能情况。传统的元启发法比较适合解决最优潮流问题,但是由于耗时太长,实际上并不实用。为此,本文提出了一种进化型多任务处理架构,根据不同负荷需求并行处理多个最优潮流问题。仿真结果表明该架构极大地提升了进化算法在最优潮流问题的利用率,与正统进化算法相比具有更快的计算速度。

关键词：进化算法进化型多任务处理元启发最优潮流

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Role of adjunctive treatment strategies in COVID-19 and a review of international and national clinical guidelines

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Military Medical Research 2020年第2期7卷 209-227页

作者： Xin-Ni Xu yew Kwang ong De Yun Wang Department of Otolaryngology-Head and Neck Surgery National University Hospital SystemSingaporeSingapore Department of Otolaryngology Yong Loo Lin School of MedicineNational University of SingaporeSingaporeSingapore

The coronavirus disease(COVID-19)pandemic has led to a global struggle to cope with the sheer numbers of infected persons,many of whom require intensive care support or eventually succumb to the *** outbreak is managed by a combination of disease containment via public health measures and supportive care for those who are *** date,there is no specific anti-COVID-19 ***,the urgency to identify treatments that could turn the tide has led to the emergence of several investigational drugs as potential candidates to improve outcome,especially in the severe to critically *** many of these adjunctive drugs are being investigated in clinical trials,professional bodies have attempted to clarify the setting where the use of these drugs may be considered as off-label or compassionate *** review summarizes the clinical evidence of investigational adjunctive treatments used in COVID-19 patients as well as the recommendations of their use from guidelines issued by international and national organizations in healthcare.

关键词： COVID-19 Adjunctive treatment Chloroquine Lopinavir-ritonavir Remdesivir Corticosteroids Umifenovir Convalescent plasma

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Decolorization of Orange Ⅱ using an anaerobic sequencing batch reactor with and without co-substrates

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Journal of Environmental Sciences 2012年第2期24卷 291-296页

作者： soon-An ong Eiichi Toorisaka Makoto Hirata Tadashi Hano Department of Applied Chemistry OitaUniversity School of Environmental Engineering University Malaysia Perlis

We investigated the decolorization of Orange Ⅱ with and without the addition of co-substrates and nutrients under an anaerobic sequencing batch reactor（ASBR）.The increase in COD concentrations from 900 to 1750 to 3730 mg/L in the system treating 100 mg/L of Orange Ⅱ-containing wastewater enhanced color removal from 27% to 81% to 89%,*** the absence of co-substrates and nutrients,more than 95% of decolorization was achieved by the acclimatized anaerobic microbes in the bioreactor treating 600 mg/L of Orange Ⅱ.The decrease in mixed liquor suspended solids concentration by endogenous lysis of biomass preserved a high reducing environment in the ASBR,which was important for the reduction of the Orange Ⅱ azo bond that caused *** maximum decolorization rate in the ASBR was approximately 0.17 g/hr in the absence of co-substrates and nutrients.

关键词： anaerobic reduction azo dye decolorization rate endogenous lysis Orange Ⅱ

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Enhanced photocatalytic activity of fish scale loaded TiO_2 composites under solar light irradiation

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Journal of Environmental Sciences 2012年第6期24卷 1142-1148页

作者： Li-Ngee Ho soon-An ong Hakimah Osman Fong-Mun Chong School of Materials Engineering University Malaysia Perlis02600 ArauPerlisMalaysia School of Environmental Engineering University Malaysia Perlis02600 ArauPerlisMalaysia

Fish scale （FS） loaded TiO2 composites were investigated as photocatalysts in degradation of Methyl Orange under solar light irradiation. Composites were prepared through sol-gel method by varying mass ratio of TiO2/FS at 90：10, 70：30 and 50：50, respectively. The catalysts prepared in this study were characterized by using XRD, SEM, FT-IR and nitrogen sorption. The effects of solar irradiation, mass ratio of TiO//FS composites, irradiation time and catalyst loadings were studied. Synergistic effect was found in TiO2/FS of 90：10 composite which performed higher photocatalytic degradation than synthesized TiO2 under solar light irradiation. However, further increasing fish scale content in the composites reduced the photocatalytic activity drastically. Under solar light irradiation, all the catalysts in this study exhibited photocatalytic activity, except TiO2/FS of 50：50 composite that only acted as a weak biosorbent without performing any photocatalytic property. Photocatalytic degradation increased with increasing catalyst loading and irradiation time but decreased with increased of initial dye concentration.

关键词： photocatalytic degradation dye fish scale TiO2

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AR-assisted robot welding programming

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Advances in Manufacturing 2020年第1期8卷 40-48页

作者： S.K.ong A.Y.C.Nee A.W.W.yew N.K.Thanigaivel Department of Mechanical Engineering Faculty of EngineeringNational University of SingaporeSingapore

Robotic welding demands high accuracy and ***,robot programming is often a tedious and time-consuming process that requires expert *** paper presents an augmented reality assisted robot welding task programming(ARWP)system using a user-friendly augmented reality(AR)interface that simplifies and speeds up the programming of robotic welding *** ARWP system makes the programming of robot welding tasks more user-friendly and reduces the need for trained programmers and expertise in specific robotic *** AR interface simplifies the definition of a welding path as well as the welding gun orientation,and the system;the system can locate the welding seam of a workpiece quickly and generate a viable welding path based on the user *** developed system is integrated with the touch-sensing capability of welding robots in order to locate the welding path accurately based on the user input,for fillet *** system is applicable to other welding processes and methods of seam *** system implementation is described and evaluated with a case study.

关键词： Augmented reality(AR) Robot programming Welding Seam tracking

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Ursolic acid: An overview on its cytotoxic activities against breast and colorectal cancer cells

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Journal of Integrative Medicine 2019年第3期17卷 155-160页

作者： Eric Wei Chiang Chan Chu Yong soon Joash Ban Lee Tan Siu Kuin Wong yew Woh Hui Faculty of Applied Sciences UCSI University School of Science Monash University Sunway Xiamen University Malaysia Bandar Sunsuria

Ursolic acid(UA) is a pentacyclic triterpene of the ursane type. As a common chemical constituent among species of the family Lamiaceae, UA possesses a broad spectrum of pharmacological properties. This overview focuses on the anticancer properties of UA against breast cancer(BC) and colorectal cancer(CRC)that are most common among women and men, respectively. In vitro studies have shown that UA inhibited the growth of BC and CRC cell lines through various molecular targets and signaling *** are several in vivo studies on the cytotoxic activity of UA against BC and CRC. UA also inhibits the growth of other types of cancer. Studies on structural modifications of UA have shown that the –OH groups at C3 and at C28 are critical factors influencing the cytotoxic activity of UA and its *** needs for future research are suggested. Sources of information were from ScienceDirect, Google Scholar and PubMed.

关键词： Ursolic acid Cytotoxic Molecular targets Signaling pathways

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Haptic and visual augmented reality interface for programming welding robots

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Advances in Manufacturing 2017年第3期5卷 191-198页

作者： D. Ni A. W. W. yew S. K. ong A. Y. C. Nee School of Instrument Science and Engineering Southeast University Nanjing 211189 Jiangsu People's Republic of China Department of Mechanical Engineering National University of Singapore 9 Engineering Drive 1 Singapore 117576Singapore

It is a challenging task for operators to program a remote robot for welding manipulation depending only on the visual information from the remote site. This paper proposes an intuitive user interface for programming welding robots remotely using augmented reality （AR） with haptic feedback. The proposed system uses a depth camera to reconstruct the surfaces of workpieces. A haptic input device is used to allow users to define welding paths along these surfaces. An AR user interface is developed to allow users to visualize and adjust the orientation of the welding torch. Compared with the traditional robotic welding path programming methods which rely on prior CAD models or contact between the robot end-effector and the workpiece, this proposed approach allows for fast and intuitive remote robotic welding path programming with- out prior knowledge of CAD models of the workpieces. The experimental results show that the proposed approach is a user-friendly interface and can assist users in obtaining an accurate welding path.

关键词： Robot programming · Human-robotinteraction ·Robotic welding · Haptic feedback ·Augmented reality (AR)

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Transoral endoscopic excision of a giant parapharyngeal space tumour:A case report

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Laparoscopic, Endoscopic and Robotic Surgery 2021年第2期4卷 53-56页

作者： Yazid Bin Pol ong Liew yew Toong Sakina Binti Gauth Prepageran Narayanan Department of Otolaryngology University of Malaya Medical CentreKuala Lumpur 59100Malaysia

Most of the parapharyngeal space tumours are *** primary treatment is complete resection of the *** to its location in the deep neck space,a pre-styloid tumour can be resected via the transoral ***,the surgical field is limited by the small oral *** the use of rigid endoscopes,removing benign tumours through transoral approach in the parapharyngeal space is possible as they provide a broad and enlarged view of the confined ***,we report a case of a 64-year-old male with a giant pre-styloid parapharyngeal space tumour,who successfully underwent transoral endoscopic ***,the patient had short hospital stay of total 3 *** chewing and swallowing were not affected,and he resumed oral feeding prior to discharge.

关键词： Parapharyngeal space Salivary gland tumour Transoral endoscopic surgery

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