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Probabilistic Global Maximum Power Point Tracking Algorithm for Continuously Varying Partial Shading Conditions on Autonomous PV Systems

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Energy and Power Engineering 2024年第1期16卷 21-42页

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

A photovoltaic (PV) string with multiple modules with bypass diodes frequently deployed on a variety of autonomous PV systems may present multiple power peaks under uneven shading. For optimal solar harvesting, there is a need for a control schema to force the PV string to operate at global maximum power point (GMPP). While a lot of tracking methods have been proposed in the literature, they are usually complex and do not fully take advantage of the available characteristics of the PV array. This work highlights how the voltage at operating point and the forward voltage of the bypass diode are considered to design a global maximum power point tracking (GMPPT) algorithm with a very limited global search phase called Fast GMPPT. This algorithm successfully tracks GMPP between 94% and 98% of the time under a theoretical evaluation. It is then compared against Perturb and Observe, Deterministic Particle Swarm Optimization, and Grey Wolf Optimization under a sequence of irradiance steps as well as a power-over-voltage characteristics profile that mimics the electrical characteristics of a PV string under varying partial shading conditions. Overall, the simulation with the sequence of irradiance steps shows that while Fast GMPPT does not have the best convergence time, it has an excellent convergence rate as well as causes the least amount of power loss during the global search phase. Experimental test under varying partial shading conditions shows that while the GMPPT proposal is simple and lightweight, it is very performant under a wide range of dynamically varying partial shading conditions and boasts the best energy efficiency (94.74%) out of the 4 tested algorithms.

关键词： Photovoltaic PV Global Maximum Power Point Tracking GMPPT Fast Varying Partial Shading Conditions Autonomous PV Systems GMPPT Review

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Emerging role of liquid biopsy in rat sarcoma virus mutated metastatic colorectal cancer:A case report

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World Journal of Gastrointestinal Oncology 2024年第1期16卷 234-243页

作者： João Gramaça Isabel Gomes Fernandes Carolina Trabulo Joana Gonçalves Rita Gameiro dos Santos Adriano Baptista idília Pina Centro Hospitalar Barreiro Montijo Centro Hospitalar Barreiro MontijoSetúbalBarreiro 2830-003Portugal Medical Oncology Unit Centro Hospitalar Barreiro MontijoSetúbalBarreiro 2830-003Portugal

BACKGROUND In patients with metastatic colorectal cancer(mCRC),the treatment options are limited and have been proved to be affected by rat sarcoma virus(RAS)mutational *** RAS wild-type(wt)patients,the combination of antiepidermal growth factor receptor(EGFR)monoclonal antibodies with chemotherapy(CT)is more effective than CT *** the other hand,RAS-mutated patients are not eligible for treatment with anti-EGFR *** SUMMARY Eleven patients with initially RAS-mutated mCRC were followed from diagnosis to May *** the time of cell-free DNA determination,five patients had undergone one CT line,five patients had undergone two CT lines,and one patient had undergone three CT lines(all in combination with bevacizumab).At the second and third treatment lines[second line(2L),third line(3L)],patients with neo-RAS wt received a combination of CT and *** neo-RAS wt patients treated with anti-EGFR,our findings indicated an increase in progression-free survival for both 2L and 3L(14.5 mo,P=0.119 and 3.9 mo,P=0.882,respectively).Regarding 2L overall survival,we registered a slight increase in neo-RAS wt patients treated with anti-EGFR(33.6 mo vs 32.4 mo,P=0.385).At data cut-off,two patients were still alive:A RAS-mutated patient undergoing 3L treatment and a neo-RAS wt patient who received 2L treatment with anti-EGFR(ongoing).CONCLUSION Our case series demonstrated that monitoring RAS mutations in mCRC by liquid biopsy may provide an additional treatment line for neo-RAS wt patients.

关键词： Metastatic colorectal cancer Rat sarcoma virus mutational status Liquid biopsy Rat sarcoma virus wild-type Neo-rat sarcoma virus wild-type Anti-epidermal growth factor receptor therapy Case report

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A Deep Learning Model of Traffic Signs in Panoramic 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 Arif Thien khai Tran International University Ho Chi Minh CityVietnam-Vietnam National UniversityHo Chi Minh City700000Vietnam Department of Computer Science The Superior UniversityLahorePakistan Ho Chi Minh City University of Foreign Languages and Information Technology Ho Chi Minh City700000Vietnam

To pursue the ideal of a safe high-tech society in a time when traffic accidents are frequent,the traffic signs detection system has become one of the necessary topics in recent years and in the *** ultimate goal of this research is to identify and classify the types of traffic signs in a panoramic *** accomplish this goal,the paper proposes a new model for traffic sign detection based on the Convolutional Neural Network for com-prehensive traffic sign classification and Mask Region-based Convolutional Neural Networks(R-CNN)implementation for identifying and extracting signs in panoramic *** augmentation and normalization of the images are also applied to assist in classifying better even if old traffic signs are degraded,and considerably minimize the rates of discovering the extra *** proposed model is tested on both the testing dataset and the actual images and gets 94.5%of the correct signs recognition rate,the classification rate of those signs discovered was 99.41%and the rate of false signs was only around 0.11.

关键词： Deep learning convolutional neural network Mask R-CNN traffic signs detection

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Buckling Analysis of FG Porous Truncated Conical Shells Resting on Elastic Foundations in the Framework of the Shear Deformation Theory

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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 Military Academy of Logistics HanoiVietnam Department of Technical Fundamental University of Transport Technology54 Trieu Khuc9 Thanh XuanHanoiVietnam Department of Mechanical Engineering and Mechatronics PHENIKAA UniversityHanoi 12116Vietnam PHENIKAA Research and Technology Institute(PRATI) A&A Green Phoenix Group JSCNo.167 Hoang NganTrung HoaCau GiayHanoi 11313Vietnam Thainguyen University of Technology ThainguyenVietnam

In this article,an analytical method is proposed to analyze of the linear buckling behavior of the FG porous truncated conical shells subjected to a uniform axial compressive load and resting on the Pasternak elastic *** material properties including Young’s modulus,shear modulus and density are assumed to vary in the thickness *** types of FG porous distributions including symmetric porosity distribution,non-symmetric porosity and uniform porosity distribution are *** governing equations of the FG porous truncated conical shells are obtained by using the first-order shear deformation theory(FSDT).With the help of the Galerkin method,the expressions for critical buckling loads are obtained in closed *** reliability of the obtained results is verified by comparing the present solutions with the published ***,the numerical results show the effects of shell characteristics,porosity distribution,porosity coefficient,and elastic foundation on the critical buckling load.

关键词： Buckling truncated conical shells first order shear deformation theory porous materials elastic foundations

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A Deep Trash Classification Model on Raspberry Pi 4

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

作者： Thien khai Tran kha Tu Huynh Dac-Nhuong Le Muhammad Arif Hoa Minh Dinh Ho Chi Minh City University of Foreign Languages and Information Technology Ho Chi Minh City700000Vietnam International University Ho Chi Minh CityVietnam-Vietnam National UniversityHo Chi Minh City70000Vietnam Faculty of Information Technology Haiphong UniversityHaiphong180000Vietnam Department of Computer Science and Information Technology University of LahoreLahorePakistan

Environmental pollution has had substantial impacts on human life,and trash is one of the main sources of such pollution in most *** classi-ﬁcation from a collection of trash images can limit the overloading of garbage dis-posal systems and efﬁciently promote recycling activities;thus,development of such a classiﬁcation system is topical and *** paper proposed an effective trash classiﬁcation system that relies on a classiﬁcation module embedded in a hard-ware setup to classify trash in real *** image dataset isﬁrst augmented to enhance the images before classifying them as either inorganic or organic *** deep learning–based ResNet-50 model,an improved version of the ResNet model,is used to classify trash from the dataset of trash *** experimental results,which are tested both on the dataset and in real time,show that ResNet-50 had an average accuracy of 96%,higher than that of related ***,integrating the classiﬁcation module into a Raspberry Pi computer,which con-trolled the trash bin slide so that garbage fell into the appropriate bin for inorganic or organic waste,created a complete trash classiﬁcation *** proves the efﬁciency and high applicability of the proposed system.

关键词： Trash classiﬁcation ResNet raspberry pi internet of things(IoT) deep learning

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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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Developmental dependence for functional eye regrowth in Xenopus laevis

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Neural Regeneration Research 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

Introduction：A key challenge in designing tissue repair strategies is knowing whether and how developmental mechanisms are used for successful repair of mature/adult *** it is known that developmental components are used in repair,it remains mostly unclear which ones are required and whether they act similarly as during *** issue is further complicated by the fact that it is difficult.

关键词： Developmental dependence for functional eye regrowth in Xenopus laevis Figure RI

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丝绸之路与“路书”——以《邬坚巴传》为中心的讨论

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西藏大学学报（社会科学版） 2022年第4期37卷 107-115页

作者：看本加西北民族大学铸牢中华民族共同体意识研究院、喜马拉雅区域研究中心甘肃兰州730030

“路书”是传统藏文历史典籍的分类体裁之一,与丝绸之路密切相关,其主要记述了中国西藏与周边民族及其相关国家的政治社会、历史地理、民俗文化等。文章以“路书”的典范之作《邬坚巴传》为个案,详细梳理了十三世纪西藏学者邬坚巴三次... 详细信息

“路书”是传统藏文历史典籍的分类体裁之一,与丝绸之路密切相关,其主要记述了中国西藏与周边民族及其相关国家的政治社会、历史地理、民俗文化等。文章以“路书”的典范之作《邬坚巴传》为个案,详细梳理了十三世纪西藏学者邬坚巴三次赴南亚的路线、所见所闻及对“他者”文化的思考,并就赴中原会见元朝皇帝忽必烈的情况也进行了论述。提出“路书”对于研究丝绸之路沿线历史文化、中国西藏与南亚地区的文化交流、中国边疆历史地理等方面重要的学术价值。

关键词：丝绸之路 “路书” 《邬坚巴传》

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ON FOETUSES WITH CEPHALIC MALFORMATIONS, DELIVERED IN THE PEIPING UNION MEDICAL COLLEGE HOSPITAL FROM JULY 1ST 1922—JAN. 1ST 1934

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Chinese Medical Journal 1935年第7期49卷 624-635+726-731页

作者： kha TI LIM M.D. Department of Obstetrics and Gynecology Peiping Union Medical College

Monstrosities though not common occur frequently enough, and so ignorance of the subject is unwise. There are numerous theories of etiology; but they still remain as theories. Besides the main malformation there are usually other minor associated malformations. Like many other instances in obstetrical work, monstrosities are apt to occur in groups. Hydramnios is a frequent but not a constant associated factor with a monstrosity, and has to be differentiated from a multiple pregnancy. The fate of the child is negligible as shown by the high fetal mortality. Early prenatal diagnosis becomes very important as it not only means relieving the mother from wasting time, energy, and bearing unnecessary suffering, in order to carry an unfruitful pregnancy to term; but it also saves submitting the mother to the danger of dystocia with all its complications. Therefore, whenever the clinical symptoms and signs are suggestive of an abnormal pregnancy, such as hydramnios towards the second half of gestation, inability to palpate the fetal head, indistinct fetal heart, and excessive fetal movements, an X-ray should be taken. Any gestation beyond 4 months should allow of a satisfactory result and should it prove to be a monster, labour should be induced at once, perhaps best of all by puncture of the, membranes. That prevention is better than cure is just as true here as elsewhere.

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ADVANCED SYNTHESIS OF LIGHT METALS

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Acta Metallurgica Sinica(English Letters) 1996年第6期9卷 531-536页

作者： F.H. Froes(IMAP, University of idaho, Moscow, id 838443026, USA ) Univ of idaho Moscow United States

The synthesis, processing and mechanical properties of the light metals, aluminum,magnesium and titanium Produced by advanced techniques are reviewed. Synthesis techniques to be addressed will include rapid solidifica... 详细信息

关键词： synthesis/processing powder metallurgy lightweight metals,aluminum magnesium,titanium rapid solidification spray depositin mechanical alloying Plasma processing,vapor deposition

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