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Hosting Capacity Evaluation Method for Power Distribution Networks Integrated with Electric Vehicles

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Journal of Modern Power Systems and Clean Energy 2023年第5期11卷 1564-1575页

作者： Wei Dai Cheng Wang hui hwang goh Jingyi Zhao Jiangyi Jian IEEE School of Electrical Engineering Guangxi UniversityNanning 530000China

The large-scale deployment of electric vehicles(EVs) poses critical challenges to the secure and economic operation of power distribution networks(PDNs). Therefore, a method for evaluating the hosting capacity that enables a PDN to determine the EV chargeable area(EVCA) to satisfy the charging demand and ensure the secure operation is proposed in this paper. Specifically, the distribution system operator(DSO) serves as a public entity to manage the integration of EVs by determining the presence of the charging load in the EVCA. Hence, an EVCA optimization model is formulated on the basis of the coupling effect of the charging nodes to determine the range of the available charging power. In this model, nonlinear power flow equations and operational constraints are considered to maintain the solvability of the power flow of the PDN. Subsequently, a novel multipoint approximation technique is proposed to quickly search for the boundary points of the EVCA. In addition, the impact of the demand response(DR) mechanism on the hosting capacity is explored. The results show that the presence of the DR significantly enlarged the EVCA during peak hours, thus revealing the suitability of the DR mechanism as an important supplement to accommodate the EV charging load. The examined case studies demonstrate the effectiveness of the proposed model and show that the unmanaged allocation of the charging load impedes secure operation. Finally, the proposed method provides a reference for the allocation of the EV charging load and a reduction in the risk of line overloading.

关键词： Capacity evaluation demand response(DR) electric vehicle(EV) electric vehicle chargeable area(EVCA)

Hybrid SDS and WPT-IBBO-DNM Based Model for Ultra-short Term Photovoltaic Prediction

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CSEE Journal of Power and Energy Systems 2023年第1期9卷 66-76页

作者： hui hwang goh Qinwen Luo Dongdong Zhang hui Liu Wei Dai Chee Shen Lim Tonni Agustiono Kurniawan Kai Chen goh School of Electrical Engineering Guangxi UniversityNanningGuangxi 530004China University of Southampton Malaysia Iskandar Puteri 79200Malaysia College of the Environment and Ecology Xiamen UniversityFujian 361102China Department of Technology Management Faculty of Construction Management and BusinessUniversity Tun Hussein Onn Malaysia86400 Parit RajaJohorMalaysia

Accurate photovoltaic(PV)power prediction has been a subject of ongoing study in order to address grid stability concerns caused by PV output unpredictability and *** paper proposes an ultra-short-term hybrid photovoltaic power forecasting method based on a dendritic neural model(DNM)in this *** model is trained using improved biogeography-based optimization(IBBO),a technique that incorporates a domestication operation to increase the performance of classical biogeography-based optimization(BBO).To be more precise,a similar day selection(SDS)technique is presented for selecting the training set,and wavelet packet transform(WPT)is used to divide the input data into many *** is then used to train DNM weights and thresholds for each component ***,each component’s prediction results are stacked and *** suggested hybrid model is used to forecast PV power under various weather conditions using data from the Desert Knowledge Australia Solar Centre(DKASC)in Alice *** results indicate the proposed hybrid SDS and WPT-IBBO-DNM model has the lowest error of any of the benchmark models and hence has the potential to considerably enhance the accuracy of solar power forecasting(PVPF).

关键词： Dendritic neural model improved biogeography-based optimization photovoltaic power forecasting similar day selection wavelet packet transform

1,3-Dipolar Cycloaddition of Polycyclic Aromatic Azomethine Ylides and Alkynylbenziodoxoles for Synthesis of Functional Dibenzoullazines

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Chinese Journal of Chemistry 2024年第10期42卷 1079-1083页

作者： hui Han Glen Wee Zhuan goh Yongxin Li Naohiko Yoshikai Shingo Ito Schoolof Chemistry ChemicalEngineering and BiotechnologyNanyang Technoogical University21 Nanyang LinkSingapore 637371Singapore Graduate School of Pharmaceutical Sciences Tohoku UniversitySendai 980-8578Japan

A new family of dibenzoullazine derivatives was synthesized through 1,3-dipolar cycloaddition of polycyclic aromatic azomethine ylides with alkynylbenziodoxoles followed by *** benziodoxole moiety in the resulting products was used as a versatile linchpin for the synthesis of structurally diverse functional dibenzoullazines that are difficult to access by other synthetic methods.

关键词： Cycloaddition Nitrogen heterocycles Azomethine ylides Hypervalent compounds Dibenzoullazine

Recent advances in graphene-based phase change composites for thermal energy storage and management

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Nano Materials Science 2024年第2期6卷 115-138页

作者： Qiang Zhu Pin Jin Ong Si hui Angela goh Reuben J.Yeo Suxi Wang Zhiyuan Liu Xian Jun Loh Institute of Materials Research and Engineering A*STAR(Agency for ScienceTechnology and Research)2 Fusionopolis WayInnovis#08-03138634Singapore Institute of Sustainability for Chemicals Energy and EnvironmentA*STAR(Agency for ScienceTechnology and Research)1 Pesek RoadJurong Island627833Singapore School of Chemistry Chemical Engineering and BiotechnologyNanyang Technological University21 Nanyang Link637371Singapore Shenzhen Institutes of Advanced Technology(SIAT) Chinese Academy of Sciences(CAS)1068 Xueyuan AvenueShenzhen518055China Department of Material Science and Engineering National University of Singapore9 Engineering Drive 1#03-09 EA117575Singapore

Energy storage and conservation are receiving increased attention due to rising global energy ***,the development of energy storage materials is *** energy storage(TES)systems based on phase change materials(PCMs)have increased in prominence over the past two decades,not only because of their outstanding heat storage capacities but also their superior thermal energy regulation ***,issues such as leakage and low thermal conductivity limit their applicability in a variety of ***-based materials such as graphene and its derivatives can be utilized to surmount these *** study examines the recent advancements in graphene-based phase change composites(PCCs),where graphene-based nanostructures such as graphene,graphene oxide(GO),functionalized graphene/GO,and graphene aerogel(GA)are incorporated into PCMs to substantially enhance their shape stability and thermal conductivity that could be translated to better storage capacity,durability,and temperature response,thus boosting their attractiveness for TES *** addition,the applications of these graphene-based PCCs in various TES disciplines,such as energy conservation in buildings,solar utilization,and battery thermal management,are discussed and summarized.

关键词： Phase change material Nanocomposites Solar energy Sustainable energy Thermo-regulation

Double-chambered left ventricle with a thrombus in an asymptomatic patient:A case report

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World Journal of Clinical Cases 2024年第2期12卷 460-465页

作者： Narae Kim In-Ho Yang hui-Jeong hwang Il-Suk Sohn Department of Medicine Kyung Hee UniversitySeoul 02447South Korea Department of Cardiology Kyung Hee University Hospital at GangdongSeoul 05278South Korea

BACKGROUND Double-chambered left ventricle(DCLV)is an extremely rare congenital disease in which the left ventricle(LV)is divided by abnormal muscle *** to its rarity,there is a lack of data on the disease,including its diagnosis,treatment,and ***,we report a case in which DCLV was diagnosed and followed *** SUMMARY A 45-year-old man presented to our hospital due to abnormal findings on an electrocardiogram recorded during a health *** had no specific cardiac symptoms,comorbidities or relevant past medical *** revealed that the LV was divided into two by muscle *** were no findings of ischemia on coronary angiography and coronary computed tomography angiography performed to exclude differential *** comprehensive analysis of the images,DCLV was *** it seemed to be asymptomatic DCLV,we decided the patient was to be observed without administering any ***,follow-up echocardiography revealed a thrombus in the accessory chamber(AC).Anticoagulant medication was initiated,the thrombus resolved,and the patient is currently undergoing follow-up without any specific *** Asymptomatic,uncomplicated DCLV was diagnosed through multimodal imaging;however,a thrombus in the AC occurred during the *** findings highlight that multimodal imaging is essential in diagnosing DCLV,and that anticoagulation is important in its management.

关键词： Double-chambered left ventricle Congenital heart disease Left ventricular aneurysm Echocardiography Coronary computed tomography angiography Contrast echocardiography Case report

Gaussian Process for a Single-channel EEG Decoder with Inconspicuous Stimuli and Eyeblinks

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Computers, Materials & Continua 2022年第10期73卷 611-628页

作者： Nur Syazreen Ahmad Jia hui Teo Patrick goh School of Electrical&Electronic Engineering Universiti Sains MalaysiaNibong TebalPenang14300Malaysia

A single-channel electroencephalography(EEG)device,despite being widely accepted due to convenience,ease of deployment and suitability for use in complex environments,typically poses a great challenge for reactive brain-computer interface(BCI)applications particularly when a continuous command from users is desired to run a motorized actuator with different speed *** this study,a combination of an inconspicuous visual stimulus and voluntary eyeblinks along with a machine learning-based decoder is considered as a new reactive BCI paradigm to increase the degree of freedom and minimize mismatches between the intended dynamic command and transmitted control *** proposed decoder is constructed based on Gaussian Process model(GPM)which is a nonparametric Bayesian approach that has the advantages of being able to operate on small datasets and providing measurements of uncertainty on *** evaluate the effectiveness of the proposed method,the GPM is compared against other competitive techniques which include k-Nearest Neighbors,linear discriminant analysis,support vector machine,ensemble learning and neural *** demonstrate that a significant improvement can be achieved via the GPM approach with average accuracy reaching over 96%and mean absolute error of no greater than 0.8 cm/*** addition,the analysis reveals that while the performances of other existing methods deteriorate with a certain type of stimulus due to signal drifts resulting from the voluntary eyeblinks,the proposed GPM exhibits consistent performance across all stimuli considered,thereby manifesting its generalization capability and making it a more suitable option for dynamic commands with a single-channel EEG-controlled actuator.

关键词： Brain-computer interface dynamic command electroence phalography gaussian process model visual stimulus voluntary eyeblinks

Intracellular interferon signalling pathways as potential regulators of covalently closed circular DNA in the treatment of chronic hepatitis B

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World Journal of Gastroenterology 2021年第14期27卷 1369-1391页

作者： Zhi Yi goh Ee Chee Ren hui Ling Ko Singapore Immunology Network Agency for ScienceTechnology and ResearchSingapore 138648Singapore Integrative Sciences and Engineering Programme NUS Graduate SchoolNational University of SingaporeSingapore 119077Singapore Department of Microbiology and Immunology Yong Loo Lin School of MedicineNational University of SingaporeSingapore 119260Singapore

250 million people worldwide continue to be chronically infected with the *** patients may be treated with nucleoside/nucleotide analogues,this only suppresses HBV titre to sub-detection levels without eliminating the persistent HBV covalently closed circular DNA(cccDNA)*** a result,HBV infection cannot be cured,and the virus reactivates when conditions are ***(IFNs)are cytokines known to induce powerful antiviral mechanisms that clear viruses from infected *** have been shown to induce cccDNA clearance,but their use in the treatment of HBV infection is limited as HBVtargeting immune cells are exhausted and HBV has evolved multiple mechanisms to evade and suppress IFN ***,to fully utilize IFN-mediated intracellular mechanisms to effectively eliminate HBV,instead of direct IFN administration,novel strategies to sustain IFN-mediated anti-cccDNA and antiviral mechanisms need to be *** review will consolidate what is known about how IFNs act to achieve its intracellular antiviral effects and highlight the critical interferon-stimulated gene targets and effector mechanisms with potent anti-cccDNA *** include cccDNA degradation by APOBECs and cccDNA silencing and transcription repression by epigenetic *** addition,the mechanisms that HBV employs to disrupt IFN signalling will be *** that have been developed or are in the pipeline for components of the IFN signalling pathway and HBV targets that detract IFN signalling mechanisms will also be identified and discussed for utility in the treatment of HBV ***,these will provide useful insights into design strategies that specifically target cccDNA for the eradication of HBV.

关键词： Covalently closed circular DNA Interferons APOBECs Epigenetic modification Hepatitis B virus therapeutics

Coronary sinus endocarditis in a hemodialysis patient:A case report and review of literature

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World Journal of Clinical Cases 2021年第17期9卷 4348-4356页

作者： hui-Jeong hwang Sung-Wook Kang Department of Cardiology Kyung Hee University Hospital at GangdongKyung Hee University College of MedicineSeoul 05278South Korea Department of Pulmonary Allergy and Critical Care MedicineKyung Hee University Hospital at GangdongSeoul 05278South Korea

BACKGROUND Infective endocarditis is more common in hemodialysis patients than in the general population and is sometimes difficult to *** coronary sinus(CS)vegetation is extremely rare and has a good prognosis,but complicated CS vegetation may have a poorer clinical *** report a case of CS vegetation accidentally found via echocardiography in a hemodialysis patient with undifferentiated *** CS vegetation may have been caused by endocardial denudation due to tricuspid regurgitant jet and subsequent *** SUMMARY A 91-year-old man with dyspnea and hypotension was transferred from a nursing *** was on regular hemodialysis and had a history of severe grade of tricuspid *** was no leukocytosis or fever upon *** and sequential blood cultures revealed absence of microorganism *** computed tomography showed lung consolidation and a large pleural effusion.A mobile band-like mass on the CS,suggestive of vegetation,was observed on *** diagnosed him with infective endocarditis involving the CS,pneumonia,and septic shock based on echocardiographic,radiographic,and clinical *** of broad-spectrum antibiotics,fluid resuscitation,inotropic support,and ventilator care were ***,the patient died from uncontrolled infection and septic *** CS vegetation can be fatal in hemodialysis patients with impaired immune systems,especially when it delays the diagnosis.

关键词： Coronary sinus Endocarditis Renal dialysis Echocardiography Diagnosis,differential Case report

A phosphotungstic acid coupled silica-Nafion composite membrane with significantly enhanced ion selectivity for vanadium redox flow battery

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Journal of Energy Chemistry 2020年第2期29卷 177-184页

作者： Xiao-Bing Yang Lei Zhao Kokswee goh Xu-Lei Sui Ling-hui Meng Zhen-Bo Wang MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001HeilongjiangChina

An ultra-high ion-selective Nafion composite membrane modified by phosphotungstic acid(PWA)coupled silica for vanadium redox flow battery(VRB)was constructed and prepared through solution *** composite membrane exhibits excellent proton conductivity and vanadium ions blocking property by incorporating the nanohybrid composed of silica and PWA into the Nafion *** tuning for the filling amount of the nanohybrid endows the obtained membranes preeminent vanadium barrier property including a minimum vanadium permeability of 3.13×10-7cm2min-1and a maximum proton conductivity of 0.081 S cm-1at 25°*** indicate an ion selectivity of 2.59×105S min cm-3,which is 6.8times higher than that of recast Nafion(0.33×105S min cm-3).As a result,the VRB with the composite membrane shows superior battery performance containing a lower self-discharge rate,higher capacity retention and more robust cyclic stability compared with recast Nafion over a range of current densities from 40 to 100 m A cm-2.

关键词： Vanadium redox flow battery Modified silica Phosphotungstic acid Low vanadium permeability