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A novel coordinated control for NZEB clusters to minimize their connected grid overvoltage risks

Building Simulation 2022年第10期15卷 1831-1848页

作者： Yelin Zhang norman chung fai tse Haoshan Ren Yongjun Sun Division of Building Science and Technology City University of Hong KongKowloonHong KongChina

The increasing applications of net-zero energy buildings (NZEBs) will lead to more frequent and larger energy interactions with the connected power grid, thereby being able to result in severe grid overvoltage risks. Control optimization has been proven effective to reduce such risks. Existing controls have oversimplified the overvoltage quantification by simply using the aggregated power exchanges to represent the connected grid overvoltages. Ignoring the complex voltage influences among the grid nodes, such oversimplification can easily result in low-accuracy impact evaluations of the NZEB-grid energy interactions, thereby causing non-optimal/unsatisfying overvoltage mitigations. Therefore, this study proposes a novel coordinated control method in which a power-distribution-network model has been adopted for more accurate overvoltage quantification. Meanwhile, the battery operations of individual NZEBs are iteratively coordinated using a sequential optimization approach for achieving the global optimum with substantially reduced computation complexity. For verifications, the proposed coordinated control has been systematically compared with an uncoordinated control and a conventional coordinated control in grid overvoltage minimization. The study results show that the overvoltage improvements can reach 23.5% and 12.3% compared with the uncoordinated control and the conventional coordinated control, respectively. The reasons behind the improvements have also been analyzed in detail. The proposed coordinated control can be used in practice to improve NZEB-clusters’ grid friendliness.

关键词： net-zero energy building coordinated control optimization,genetic algorithm overvoltage quantification grid friendliness

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Does Topical Agent Help Fracture Healing? A Pilot Study Using a Herbal Patch

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Open Journal of Therapy and Rehabilitation 2015年第2期3卷 35-39页

作者： Lung-Fung tse Hi-Shan Cheng Chi-Yin Tso Yuk-Wah Hung Leung-Kim Hung Jing-Zhou Chen Xue-Lin Zhou Chak-Hei Fung Ellie Suet-Yee Pang King-fai Cheng Chun-Kwok Wong Ping-chung Leung Department of Orthopaedics & Traumatology Prince of Wales Hospital Hong Kong China Department of Orthopaedics & Traumatology The Chinese University of Hong Kong Hong Kong China Institute of Chinese Medicine The Chinese University of Hong Kong Hong Kong China State Key Laboratory of Phytochemistry and Plant Resources in West China The Chinese University of Hong Kong Hong Kong China Department of Chemical Pathology The Chinese University of Hong Kong Hong Kong China

To observe the safety and effectiveness of a topical herbal agent used to promote fracture healing, a herbal patch containing extracts of three herbs, viz., Flos Carthami, Radix Dipsaci, Rhizoma Rhei and Borneolum Syntheticum (an enhancer) was applied on ten subjects with un-displaced fifth metatarsal fractures. Pain scores, foot and ankle function questionnaires and regional swelling were carefully assessed and recorded. Peripheral blood was taken to measure the inflammation cytokines. Assessment checks were performed biweekly to enforce effective patch application and compliance. The results showed that pain improved after two weeks and fracture sites swelling had 20% reduction in thickness when measured with an ultrasonic tool. Foot and ankle functional scores markedly improved after six weeks. Radiological examinations revealed early perfect fracture unions. The topical herbal patch was effective in promoting fracture healing. It was well tolerated by the fracture patients. Larger randomized controlled trials would be indicated.

关键词： Fracture Traditional Chinese Medicine Topical Agent Herbal Treatment

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Impact of exercise on neuro-cognitive function and hippocampal plasticity in early psychosis—a preliminary data analysis

Impact of exercise on neuro-cognitive function and hippocamp...

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中华医学会精神病学分会第九次全国学术会议

作者： LIN Jing-xia,~1 May Mei-Ling Lam,~1 Kit-Wa Chan,~1 Wing-chung Chang,~1 Glen Joe,~2 Gloria Hoi-Yan Wong,~1 Cindy Pui-Yu Chiu,~1 Pek-Lan Khong,~3 William G Honer,Wayne Su,~4 Cecilia Lai-Wan Chan,~5 Kwok-fai So,~6 Michael tse~2 and Eric Yu-Hai Chen~1 1 Department of Psychiatry,the University of Hong Kong 2 Institute of Human Performance,the University of Hong Kong 3 Department of Diagnostic Radiology,the University of Hong Kong 4 Department of Psychiatry,University of British Columbia,Vancouver,Canada 5 Department of Social Work and Social Administration,the University of Hong Kong 6 Department of Anatomy,the University of Hong Kong

Objectives Hippocampal volume is lower in schizophrenic patients than in normal *** present study aimed to investigate whether physical exercise would increase hippocampal volume in patients with early psychosis,and whether this effect would be related to improved neuro-cognitive functions. Methods A total of 60 female psychosis patients aged 18-55 years old with less than 5 years illness duration were

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