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| 1 | Artificial Neural Network Maximum Power Point Tracker for Solar Electric Vehicle显示文摘This paper proposes an artificial neural network maximum power point tracker (MPPT) for solar electric vehicles. The MPPT is based on a highly efficient boost converter with insulated gate bipolar transis- tor (IGBT) power switch. The reference voltage for MPPT is obtained by artificial neural network (ANN) with gradient descent momentum algorithm. The tracking algorithm changes the duty-cycle of the converter so that the PV-module voltage equals the voltage corresponding to the MPPT at any given insolation, tempera- ture, and load conditions. For fast response, the system is implemented using digital signal processor (DSP). The overall system stability is improved by including a proportional-integral-derivative (PID) controller, which is also used to match the reference and battery voltage levels. The controller, based on the information sup- plied by the ANN, generates the boost converter duty-cycle. The energy obtained is used to charge the lith- ium ion battery stack for the solar vehicle. The experimental and simulation results show that the proposed scheme is highly efficient. | Theodore Amissah OCRAN 曹军义 曹秉刚 孙兴华 | 2005 | Tsinghua Science and Technology2005，10，2： | 3 |
| 2 | Childhood lead poisoning in Africa:a growing public health problem 显示文摘 | Nriagu J Blankson M Ocran K | 1996 | Sci Total Environ1996，181，： | 1 |
| 3 | The clash of legal cultures:The treatment of indigenous law in colonial and post-colonial Africa显示文摘 | Ocran J M | | 0，，01： | 1 |
| 4 | Agricultural commodity supply response in Ghana显示文摘 | OCRAN M K BIEKPE N | 2008 | Journal of Economic Studies2008，35，3： | 1 |
| 5 | 基于学生探究与迁移能力培养的“菱形”教学研究显示文摘探究教学是新课程改革大力提倡的教学方式之一。为进一步研究探究教学,笔者以初中数学中的'菱形'为教学主题,在绍兴市柯桥区某中学开展了教学实验,即通过引导学生拼接平行四边形的活动发现菱形,通过观察图形和比照平行四边形、矩形的性质探究出菱形的所有性质,同时实现从平行四边形、矩形的教学到菱形教学的迁移。实践证明,教师可以通过科学设计和有效实施教学,较为成功地解决基础教育数学课堂中教师教学存在的教学逻辑主干不明、盲目追求多样化、忽视学情、顺序混乱以及探究教学流于形式等问题。 | 俞宏毓 尉劲松 OCRAN PATRICK | 2019 | 内蒙古师范大学学报(教育科学版)2019，32，4： | 1 |
| 6 | Childhood lead poisoning in Africa:a growing public health problem显示文摘 | NRIAGU J BLANKSON M OCRAN K | 1996 | Sci Total Environ1996，181，： | 1 |
| 7 | Hepatoma with severe non-islet c ell tumor hypoglycemia显示文摘 | Schofl C Ocran KW | 1998 | Am J Gastroenterol1998，93，6： | 1 |
| 8 | Agricultural commodity supply response in Ghana显示文摘 | OCRAN M K BIEKPE N | | 0，，03： | 1 |
| 9 | Childhood lead poisoning in Africa:a growing public health problem显示文摘 | Nriagu J O Blankson M L Ocran K | 1996 | Science of The Total Environment1996，181，2： | 1 |
| 10 | Childhood lead poisoning in Africa: a growing public health problem 显示文摘 | Nriagu J Blankson M Ocran K | 1996 | Sci Total Environ1996，181，： | 1 |
| 11 | Childhood lead poisoning in Africa: a growing public health problem 显示文摘 | NRIAGU J O BLANKSON M L OCRAN K | 1996 | The Science of the Total Environment1996，，181： | 1 |
| 12 | Population Based Refer- ence Intervals for Common Blood Haematological and Biochemical Parameters in the Akuapem North District 显示文摘 | KA Koram MM Addae JC Ocran | 2007 | Ghnan Med j2007，41，4： | 1 |
| 13 | Sonographie findings in hepatic involvement of hereditary haemorrhagic telangiectasia显示文摘 | Ocran K Rickes S Heukamp I | 2004 | Uhraschall Med2004，25，： | 1 |
| 14 | The Clash of Legal Cultures: The Treatment of Indigenous Law in Colonial and Post-Colonial Africa显示文摘 | OCRAN Modibo | 2006 | Law Review2006，，39： | 1 |
| 15 | Agricultural Commodity Supply Response in Ghana 显示文摘 | Ocran M K Biekpe N | 2008 | Journal of Economic Studies2008，35，3： | 1 |
| 16 | Evaluation of diagnosticcriteria for liver metastases of adenocarcinomas and neuroendocrinetumours at conventional ultrasound,unenhanced power Dopplersonography and echo-enhanced ultrasound显示文摘 | Rickes S Ocran K Gerstenhauer G | | 0，，01： | 1 |
| 17 | Agricultural commodity supply response in Ghana显示文摘 | Matthew Kofi Ocran Nicholas Biekpe | 2008 | Journal of Economic Studies2008，，3： | 1 |
| 18 | Differentiation of neuroendocrinetumors from other pancreatic lesions by echoenhanced power Dopplersonography and somatostatin receptor scintigraphy显示文摘 | Rickes S Unkrodt K Ocran K | | 0，，01： | 1 |
| 19 | A compositional function hybridization of PSO and GWO for solving well placement optimisation problem显示文摘Advances in technology and optimisation are helping to improve decision making in the oil and gas industry.However,most of the traditional metaheuristic algorithms applied in well placement optimisation problems suffer from extensive parameter experimentations and local optimum trapping issues.This couples with the complex and heterogeneous nature of hydrocarbon reservoirs and increased decision variables poses severe simulation process demands.This study considered a functional composition integration approach to formulate a robust hybrid metaheuristic algorithm called HGWO-PSO.The HGWO-PSO leverages on the strengths of Grey Wolf Optimiser(GWO)and Particle Swarm Optimisation(PSO)and the Clerc's parameter setting considerations.A rigorous approach which enforces regulatory agreed minimum well spacing was incorporated in the optimisation process.Reservoir models ranging from unimodal to multimodal spatial systems were used as examples to test the explorative and exploitative capabilities of the algorithms.In this paper we show the performance curve and statistical analysis of HGWO-PSO as a well placement algorithm and compares its performance with that of standalone PSO,and GWO and the traditional Genetic Algorithm(GA).Results revealed that the HGWO-PSO demonstrated comparative performances in terms of exploration and exploitation obtaining the best optimal solutions which give highest contractor's NPVs in majority of cases considered.Again,the means and standard deviations for HGWO-PSO among the various runs showed consistent and efficient performance.The Wilcoxon signed rank test conducted gave very low p-values suggesting uniqueness of HGWO-PSO from the other metaheuristic variants.Additionally,the computational speed of HGWO-PSO was relatively better as compared to the individual GWO and PSO in most the test cases.The simulation results for all test cases confirm that implementation of HGWO-PSO can cause considerable improvement in locations of wells even in heterogeneous reservoirs. | Daniel Ocran Sunday Sunday Ikiensikimama Eric Broni-Bediako | 2022 | Petroleum Research2022，7，3： | 0 |
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