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| 1 | 基于温度的天气衍生品指数定价:以埃塞俄比亚巴赫达尔为例(英文)显示文摘本文提出了一个基于温度的导数来计算温度指数的日平均温度随机模型,该模型提出了一个季节性均值及其波动率的计算方法,使用均值回归的Ornstein-Uhlenbeck过程来刻画日平均温度的变化。本文还采用连续的三阶自回归过程来模拟去除趋势和季节性影响后的温度演变过程,模型的模拟结果与从埃塞俄比亚国家气象厅获得的2005年1月1日至2015年12月31日11年间埃塞俄比亚Bahir Dar记录的数据非常吻合。验证后的近似公式很容易根据热日和冷日(heating degree days (HDD) and cooling degree days (CDD))等典型温度指数推导期货价格,也给出了数值例子来说明该方法的准确性。结果表明,本文提出的模型比其他模型能更好地预测CDD指数。 | Tesfahun BERHANE Aemiro SHIBABAW Gurju AWGICHEW | 2019 | Journal of Resources and Ecology2019，10，4： | 4 |
| 2 | Integrated Optimization of Smart Home Appliances with Cost-effective Energy Management System显示文摘Smart grid enables consumers to control and sched-ule the consumption pattern of their appliances,minimize energy cost,peak-to-average ratio(PAR)and peak load demand.In this paper,a general architecture of home energy management system(HEMS)is developed in smart grid scenario with novel restricted and multi-restricted scheduling method for the residen-tial customers.The optimization problem is developed under the time of use pricing(TOUP)scheme.To optimize the formulated problem,a powerful meta-heuristic algorithm called grey wolf optimizer(GWO)is utilized,which is compared with particle swarm optimization(PSO)algorithm to show its effectiveness.A rooftop photovoltaic(PV)system is integrated with the system to show the cost effectiveness of the appliances.For analysis,eight different cases are considered under various time scheduling algorithms. | Tesfahun Molla Baseem Khan Bezabih Moges Hassan Haes Alhelou Reza Zamani Pierluigi Siano | 2019 | CSEE Journal of Power and Energy Systems2019，5，2： | 2 |
| 3 | 用卡尔曼滤波算法预测埃塞俄比亚咖啡价格(英文)显示文摘埃塞俄比亚咖啡价格波动很大,因此对国家经济发展的影响不容小视,对咖啡价格进行预测具有理论和实践意义。为了分析咖啡价格波动,我们采用来自埃塞俄比亚商品交易所(ECX)记录的2008年6月25日至2017年1月5日期间咖啡日收盘价数据。在这里,咖啡价格的性质是非平稳的,我们在单个线性状态空间模型上应用卡尔曼滤波算法来预测咖啡价格的最优值,主要通过使用均方根误差(RMSE)来评估用于预测咖啡价格的算法的性能。基于线性状态空间模型和卡尔曼滤波算法,均方根误差(RMSE)为0.000016375,说明该算法性能良好,研究结果可靠。 | Tesfahun Berhane Nurilign Shibabaw Aemiro Shibabaw Molalign Adam Abera A.Muhamed | 2018 | Journal of Resources and Ecology2018，9，3： | 1 |
| 4 | DHA-induced stress response in human colon cancer cells – Focus on oxidative stress and autophagy显示文摘 | Kristine Pettersen Vivi Talstad Monsen Caroline Hild Hakv?g Pettersen Hilde Bremseth Overland Grete Pettersen Helle Samdal Almaz Nigatu Tesfahun Anne G?ril Lundemo Geir Bj?rk?y Svanhild Sch?nberg | 2015 | Free Radical Biology and Medicine2015，，： | 1 |
| 5 | Thermal decomposition of ammonium bis-oxalatodiaquain-date(Ⅲ)显示文摘 | TESFAHUN K KARRI V RAMANA M S | 2001 | Thermochimica Acta2001，371，12： | 1 |
| 6 | Remarks on Regularity and Uniqueness of the Dirac-Klein-Gorden Equations in one Space Dimension 显示文摘 | Selberg S Tesfahun A | 2010 | NoDEA Nonlinear Dfferrn- tial Equations and Applications2010，17，4： | 1 |
| 7 | Assessment of siltation and nutrient enrichment of Gilgel Gibe dam, Southwest Ethiopia 显示文摘 | Devi R Tesfahune E Legesse W | 2008 | Bioresource Technology2008，99，5： | 1 |
| 8 | Diabetes causes decreased osteoclastogenesis, reduced bone formation, and enhanced apoptosis of osteoblastic cells in bacteria stimulated bone loss显示文摘 | Hongbing He Rongkun Liu Tesfahun Desta | 2004 | Endocrinology2004，145，： | 1 |
| 9 | Diabetes-Enhanced Tumor Necrosis Factor-α Production Promotes Apoptosis and the Loss of Retinal Microvascular Cells in Type 1 and Type 2 Models of Diabetic Retinopathy显示文摘 | Yugal Behl Padmaja Krothapalli Tesfahun Desta Amanda DiPiazza Sayon Roy Dana T. Graves | 2008 | The American Journal of Pathology2008，，5： | 1 |
| 10 | Flow of Newtonian Fluid in Non-Uniform Tubes with Application to Renal Flow:A Numerical Study显示文摘In this paper,a numerical method employing a finite difference technique is used for an investigation of viscous,incompressible fluid flow in a tube with absorbing wall and slowly varying cross-section.The effect of fluid absorption through permeable wall is accounted by prescribing flux as a function of axial distance.The method is not restricted by the parameters in the problem such as wave number,permeability parameter,amplitude ratio and Reynolds number.The effects of these parameters on the radial velocity and mean pressure drop is studied and the results are presented graphically.Comparison is also made between the results obtained by perturbation method of solution and present approach. | P.Muthu Tesfahun Berhane | 2011 | Advances in Applied Mathematics and Mechanics2011，3，5： | 0 |
| 11 | 使用跳跃扩散模型的咖啡价格期权定价(英文)显示文摘这篇文章旨在构建一个期权定价模型以减少与埃塞俄比亚咖啡价格波动相关的风险。我们使用从埃塞俄比亚商品交易所(ECX)获得的2011年5月31日至2018年3月30日期间记录的埃塞俄比亚每日(WSDA3)咖啡价格来分析其咖啡价格的波动。本文使用跳跃扩散模型对咖啡价格进行建模和期权定价,应用最大似然法估计模型参数,使用均方根误差(RMSE)来对模型进行验证。结果表明Merton和双指数跳跃扩散模型的RMSE值分别为0.1093和0.0783,模型模拟结果与实际数据非常吻合,说明采用蒙特卡罗技术得到的WSDA3价格来对期权定价时,双指数跳跃扩散模型比Merton模型更为有效。 | Tesfahun BERHANE Molalign ADAM Guriju AWGICHEW Eshetu HAILE | 2020 | Journal of Resources and Ecology2020，11，1： | 0 |
| 12 | 埃塞俄比亚时空降雨分布和马尔科夫链模拟随机日降雨模型显示文摘本文针对埃塞俄比亚降雨的时空分布建立了随机日降雨模型。首先使用具有模拟年分量(AY)的马尔科夫链模型(MCAYM)来模拟日降雨的发生过程,模拟效果较为理想。然后,结合发生过程模型和数量过程模型,我们开发了马尔科夫链模拟年降雨的威布尔模型(MCAYWBM)、马尔科夫链模拟年降雨的对数正态模型(MCAYLNM)、马尔科夫链模拟年降雨的混合指数模型(MCAYMEM)和马尔科夫链模拟年降雨的伽玛模型(MCAYGM)。通过从埃塞俄比亚国家气象局(ENMA)的21个气象站获取每日(1984年1月1日至2018年12月31日)降雨数据来评估模型的性能。结果表明,MCAYWBM、MCAYMEM和MCAYGM在埃塞俄比亚日降雨过程的模拟中表现非常好,与MCAYLNM相比,它们的性能几乎相同但又略有差别。MCAYGM、MCAYWBM、MAYMEM和MCAYLNM四个模型的平均绝对百分比误差(MAPE)分别为2.16%、2.27%、2.25%和11.41%。因此,与MCAYLNM相比,MCAYGM、MCAYWBM、MAYMEM模型表现出更优异的性能,威布尔分布、伽马分布和混合指数分布是模拟埃塞俄比亚日降雨强度的合适概率分布,尤其当这些分布与MCAYM结合时,其模拟效果更好。 | Nurilig SHIBABAW Tesfahun BERHANE Tesfaye KEBED Assaye WALELIGN | 2022 | Journal of Resources and Ecology2022，13，2： | 0 |
| 13 | A comprehensive analysis of smart home energy management system optimization techniques显示文摘Development of smart grid technology provides an opportunity to various consumers in context for scheduling their energy utilization pattern by themselves.The main aim of this whole exercise is to minimize energy utilization and reduce the peak to average ratio (PAR) of power.The two way flow of information between electric utilities and consumers in smart grid opened new areas of applications.The main component is this management system is energy management controller (EMC),which collects demand response (DR) i.e.real time energy price from various appliances through the home gateway (HG).An optimum energy scheduling pattern is achieved by EMC through the utilization of DR information.This optimum energy schedule is provided to various appliances via HG.The rooftop photovoltaic system used as local generation micro grid in the home and can be integrated to the national grid.Under such energy management scheme,whenever solar generation is more than the home appliances energy demand,extra power is supplied back to the grid.Consequently,different appliances in consumer premises run in the most efficient way in terms of money.Therefore this work provides the comprehensive review of different smart home appliances optimization techniques,which are based on mathematical and heuristic one. | Tesfahun Molla Baseem Khan Pawan Singh | 2018 | Journal of Autonomous Intelligence2018，1，1： | 0 |
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