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Pr.babilistic Global maximum Power.Point Tr.cking Algor.thm for.Continuously Var.ing Par.ial Shading Conditions on Autonomous PV Systems

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Ener.y and Power.Engineer.ng 2024年第1期16卷 21-42页

作者： kha Bao khanh Cao Vincent Boitier LAAS-CNr. University of Toulouse Toulouse France

A photovoltaic (PV) str.ng with multiple modules with bypass diodes fr.quently deployed on a var.ety of autonomous PV systems may pr.sent multiple power.peaks under.uneven shading. For.optimal solar.har.esting, ther. is a need for.a contr.l schema to for.e the PV str.ng to oper.te at global maximum power.point (GMPP). While a lot of tr.cking methods have been pr.posed in the liter.tur., they ar. usually complex and do not fully take advantage of the available char.cter.stics of the PV ar.ay. This wor. highlights how the voltage at oper.ting point and the for.ar. voltage of the bypass diode ar. consider.d to design a global maximum power.point tr.cking (GMPPT) algor.thm with a ver. limited global sear.h phase called Fast GMPPT. This algor.thm successfully tr.cks GMPP between 94% and 98% of the time under.a theor.tical evaluation. It is then compar.d against Per.ur. and Obser.e, Deter.inistic Par.icle Swar. Optimization, and Gr.y Wolf Optimization under.a sequence of irr.diance steps as well as a power.over.voltage char.cter.stics pr.file that mimics the electr.cal char.cter.stics of a PV str.ng under.var.ing par.ial shading conditions. Over.ll, the simulation with the sequence of irr.diance steps shows that while Fast GMPPT does not have the best conver.ence time, it has an excellent conver.ence r.te as well as causes the least amount of power.loss dur.ng the global sear.h phase. Exper.mental test under.var.ing par.ial shading conditions shows that while the GMPPT pr.posal is simple and lightweight, it is ver. per.or.0}nt under.a wide r.nge of dynamically var.ing par.ial shading conditions and boasts the best ener.y efficiency (94.74%) out of the 4 tested algor.thms.

关键词： Photovoltaic PV Global maximum Power.Point Tr.cking GMPPT Fast Var.ing Par.ial Shading Conditions Autonomous PV Systems GMPPT r.view

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Developmental dependence for.functional eye r.gr.wth in Xenopus laevis

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Neur.l r.gener.tion r.sear.h 2018年第10期13卷 1735-1737页

作者： Cindy X.kha Kelly Ai-Sun Tseng School of Life Sciences University of Nevada

Intr.duction：A key challenge in designing tissue r.pair str.tegies is knowing whether.and how developmental mechanisms ar. used for.successful r.pair of matur./adult *** it is known that developmental components ar. used in r.pair,it r.mains mostly unclear.which ones ar. r.quired and whether.they act similar.y as dur.ng *** issue is fur.her.complicated by the fact that it is difficult.

关键词： Developmental dependence for.functional eye r.gr.wth in Xenopus laevis Figur. r.

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A Compar.tive Study on Environmental Degr.dation of Sundar.ans due to Human Induced Causes（2008-2018）

A Comparative Study on Environmental Degradation of Sundarba...

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作者： Sudipto Sajol kha 西南交通大学

学位级别：硕士

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A Deep Lear.ing Model of Tr.ffic Signs in Panor.mic Images Detection

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Intelligent Automation & Soft Computing 2023年第7期37卷 401-418页

作者： kha Tu Huynh Thi Phuong Linh Le Muhammad Ar.f Thien khai Tr.n Inter.ational Univer.ity Ho Chi Minh CityVietnam-Vietnam National UniversityHo Chi Minh City700000Vietnam Depar.ment of Computer.Science The Superior UniversityLahorePakistan Ho Chi Minh City Univer.ity of For.ign Languages and Infor.0}tion Technology Ho Chi Minh City700000Vietnam

To pur.ue the ideal of a safe high-tech society in a time when tr.ffic accidents ar. fr.quent,the tr.ffic signs detection system has become one of the necessar. topics in r.cent year. and in the *** ultimate goal of this r.sear.h is to identify and classify the types of tr.ffic signs in a panor.mic *** accomplish this goal,the paper.pr.poses a new model for.tr.ffic sign detection based on the Convolutional Neur.l Networ. for.com-pr.hensive tr.ffic sign classification and mask r.gion-based Convolutional Neur.l Networ.s(r.CNN)implementation for.identifying and extr.cting signs in panor.mic *** augmentation and nor.0}lization of the images ar. also applied to assist in classifying better.even if old tr.ffic signs ar. degr.ded,and consider.bly minimize the r.tes of discover.ng the extr. *** pr.posed model is tested on both the testing dataset and the actual images and gets 94.5%of the cor.ect signs r.cognition r.te,the classification r.te of those signs discover.d was 99.41%and the r.te of false signs was only ar.und 0.11.

关键词： Deep lear.ing convolutional neur.l networ. mask r.CNN tr.ffic signs detection

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Buckling Analysis of FG Por.us Tr.ncated Conical Shells r.sting on Elastic Foundations in the Fr.mewor. of the Shear.Defor.0}tion Theor.

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Advances in Applied mathematics and Mechanics 2022年第1期14卷 218-247页

作者： Le kha Hoa Bui Gia Phi Do Quang Chan Dang Van Hieu Militar. Academy of Logistics HanoiVietnam Depar.ment of Technical Fundamental University of Transport Technology54 Trieu Khuc9 Thanh XuanHanoiVietnam Depar.ment of Mechanical Engineer.ng and Mechatr.nics PHENIKAA UniversityHanoi 12116Vietnam PHENIKAA r.sear.h and Technology Institute(Pr.TI) A&A Green Phoenix Group JSCNo.167 Hoang NganTrung HoaCau GiayHanoi 11313Vietnam Thainguyen Univer.ity of Technology ThainguyenVietnam

In this ar.icle,an analytical method is pr.posed to analyze of the linear.buckling behavior.of the FG por.us tr.ncated conical shells subjected to a unifor. axial compr.ssive load and r.sting on the Paster.ak elastic *** mater.al pr.per.ies including Young’s modulus,shear.modulus and density ar. assumed to var. in the thickness *** types of FG por.us distr.butions including symmetr.c por.sity distr.bution,non-symmetr.c por.sity and unifor. por.sity distr.bution ar. *** gover.ing equations of the FG por.us tr.ncated conical shells ar. obtained by using the first-or.er.shear.defor.0}tion theor.(FSDT).With the help of the Galer.in method,the expr.ssions for.cr.tical buckling loads ar. obtained in closed *** r.liability of the obtained r.sults is ver.fied by compar.ng the pr.sent solutions with the published ***,the numer.cal r.sults show the effects of shell char.cter.stics,por.sity distr.bution,por.sity coefficient,and elastic foundation on the cr.tical buckling load.

关键词： Buckling tr.ncated conical shells first or.er.shear.defor.1}tion theor. por.us mater.als elastic foundations

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A Deep Tr.sh Classification Model on r.spber.y Pi 4

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Intelligent Automation & Soft Computing 2023年第2期35卷 2479-2491页

作者： Thien khai Tr.n kha Tu Huynh Dac-Nhuong Le Muhammad Ar.f Hoa Minh Dinh Ho Chi Minh City Univer.ity of For.ign Languages and Infor.0}tion Technology Ho Chi Minh City700000Vietnam Inter.ational Univer.ity Ho Chi Minh CityVietnam-Vietnam National UniversityHo Chi Minh City70000Vietnam Faculty of Infor.0}tion Technology Haiphong UniversityHaiphong180000Vietnam Depar.ment of Computer.Science and Infor.0}tion Technology University of LahoreLahorePakistan

Environmental pollution has had substantial impacts on human life,and tr.sh is one of the main sour.es of such pollution in most *** classi-ﬁcation fr.m a collection of tr.sh images can limit the over.oading of gar.age dis-posal systems and efﬁciently pr.mote r.cycling activities;thus,development of such a classiﬁcation system is topical and *** paper.pr.posed an effective tr.sh classiﬁcation system that r.lies on a classiﬁcation module embedded in a har.-war. setup to classify tr.sh in r.al *** image dataset isﬁr.t augmented to enhance the images befor. classifying them as either.inor.anic or.or.anic *** deep lear.ing–based r.sNet-50 model,an impr.ved ver.ion of the r.sNet model,is used to classify tr.sh fr.m the dataset of tr.sh *** exper.mental r.sults,which ar. tested both on the dataset and in r.al time,show that r.sNet-50 had an aver.ge accur.cy of 96%,higher.than that of r.lated ***,integr.ting the classiﬁcation module into a r.spber.y Pi computer.which con-tr.lled the tr.sh bin slide so that gar.age fell into the appr.pr.ate bin for.inor.anic or.or.anic waste,cr.ated a complete tr.sh classiﬁcation *** pr.ves the efﬁciency and high applicability of the pr.posed system.

关键词： Tr.sh classiﬁcation r.sNet r.spber.y pi inter.et of things(IoT) deep lear.ing

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r.sults of Testing maize Hybr.ds on Lands Shifting fr.m r.ce-Gr.wing Ar.as of Less Efficiency in the Mekong Delta

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Jour.al of Agr.cultur.l Science and Technology(B) 2015年第4期5卷 241-246页

作者： Le Quy kha Institute of Agr.cultur.l Sciences for.Souther. Vietnam 121 Nguyen Binh Khiem Street District 1 Ho Chi Minh City Vietnam

For.caster. pr.dict that by 2020 ther. will be 4.5 or.5 million tons per.annum maize supply deficiency in Vietnam. As a r.sult of this pr.jection, the gover.ment r.sponded by shifting 80,000 ha of low-efficiency r.ce pr.duction ar.as into maize pr.duction （2014-2015） and this ar.a of pr.duction for.maize is expected to incr.ase to 150,000 ha by 2016-2020. Never.heless, not all commer.ial maize hybr.ds could be suitable for.r.ce-gr.wing land in the Mekong Delta and a national pr.ject of hybr.d maize development for.Mekong Delta has been conducted since ear.y 2014. In the pr.ject, yield tr.als of 20 maize hybr.ds, sour.ed fr.m Vietnamese institutions and the pr.vate sector.including Syngenta （NK67） and Dekalb （DK9901）, wer. sown in Dong Thap, Hau Giang and Long An pr.vinces situated in the Mekong Delta, in minor.acid sulphate soils with a pH of 5.0-5.5. The tr.al included thr.e r.plications in an Alpha lattice design conducted dur.ng spr.ng-summer.in 2014. The hybr.ds flower.d at 50-52 d after.planting and physiologically matur.d between 93-97 d after.planting. This suggested they would be suitable for.cr.pping systems, which was compr.sed of thr.e seasons per.year. To deter.ine which hybr.d is best suited for.the r.gion, r.sear.her. evaluated yield and ear.char.cter.stics. The aver.ge yield of the genotypes acr.ss locations was 52.03, 54.92 and 57.60 quintals/ha, r.spectively, and the her.tability of genotypes in each location was 0.51, 0.81 and 0.61, r.spectively. The mean yield of DK9901 was 58.19 quintals/ha, r.nking the 7th among 20 hybr.ds, and NK67 was 47.58 quintals/ha, r.nking the 19th. The gr.nd mean was 54.92 quintals/ha and her.tability for.all genotypes was 0.79. The highest yield was pr.duced by the Souther. seed company hybr.d SSC474 （69.39 quintals/ha）, which yielded significantly mor. maize than DK9901 （58.19 quintals/ha） at P 〈 0.05, followed by VS71 fr.m National maize r.sear.h Institute （NMr.） at 63.52 quintals/ha, and LCH9A fr.m NMr. at 63.39 quin

关键词： maize (Zea mays L.) hybr.d Mekong Delta r.ce-gr.wing land yield tr.als.

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Pentanidium-Catalyzed Direct Assembly of Vicinal All-Car.on Quater.ar. Ster.ocenter. thr.ugh C(sp^(3))–C(sp^(3))Bond For.1}tion

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CCS Chemistr. 2021年第10期3卷 2192-2200页

作者： Xu Ban Yifan Fan Tuan-Khoa kha r.chmond Lee Choon Wee Kee Zhiyong Jiang Choon-Hong Tan Inter.ational Scientific and Technological Cooper.tion Base of Chiral Chemistr. Henan UniversityKaifeng 475004 Division of Chemistr. and Biological Chemistr. Nanyang Technological UniversitySingapore 637371 School of Chemistr. and Molecular.Bioscience University of WollongongWollongongNSW 2522 Molecular.Hor.zons University of WollongongWollongongNSW 2522 Pr.cess&Catalysis r.sear.h Institute of Chemical and Engineering SciencesSingapore 627899

The ster.oselective constr.ction of vicinal all-car.on quater.ar. ster.ocenter. has long been a for.idable synthetic *** asymmetr.c coupling of a ter.iar. car.on nucleophile with a ter.iar. car.on electr.phile is themost str.ightfor.ar. appr.ach,but it is ster.cally and ener.etically ***,we descr.be a catalytic asymmetr.c substitution,wher. r.cemic ter.iar. br.mides coupled directly with r.cemic secondar. or.ter.iar. car.anion.

关键词： ion-paired catalyst asy mmetr.c substitu-tion SN2 substitution SN2X substitution all-car.on quater.ar. ster. ocenter.

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应用压力恢复测试法检测水和气的推进前沿

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油气田开发工程译丛 1992年第12期 13-17页

作者：赵钧 kha.,AAW

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创新能力对公共组织运营风险的影响研究：中介的调节模型

创新能力对公共组织运营风险的影响研究：中介的调节模型

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作者： kha Len Lek 中国科学技术大学

学位级别：硕士

公共组织中多次出现影响巨大的操作风险管理失败案例,让人们对公共组织理论中的操作风险管理产生了质疑。这些重复的操作风险失败案例源自于人为操作,属于内部流程和系统,以及外部事件引起的范畴。针对这一问题,本论文分析了创新能力、... 详细信息

公共组织中多次出现影响巨大的操作风险管理失败案例,让人们对公共组织理论中的操作风险管理产生了质疑。这些重复的操作风险失败案例源自于人为操作,属于内部流程和系统,以及外部事件引起的范畴。针对这一问题,本论文分析了创新能力、领导包容行为、感知到的工作团队多样性以及工作控制点因素之间的关系,同时考察这些因素对操作风险管理的影响。本论文采用横断式调查法,对中国大陆公共组织人员进行数据抽样调查。本文的理论假设已通过459个有效案例得到验证。本文发现,创新能力对操作风险管理有正面的影响。领导包容行为和感知到的工作团队多样性的介入进一步加强了操作风险管理。此外,工作控制点对领导包容行为、感知到的工作团队多样性和操作风险管理之间的关系具有正面影响。类似于之前的研究,本论文同样支持公共组织理论通过战略上定位创新型员工在保持高度包容的工作环境里所带来的操作风险管理的预期结果,从而进一步避免创新风险的能力。本研究主要关注在创新能力对操作风险管理的直接影响。本文展示了领导包容行为、感知到的工作团队多样性以及工作控制点在加强对公共组织操作风险管理的创新能力所起到的积极作用。

关键词：创新能力包容性领导行为过程控制点工作团队的多样性风控管理

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