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Ecosystem Health and Sustainability 2020年第1期6卷 309-319,308页

作者： Tesfay Atsbha solomon Wayu Nguse Gebretsadkan Tsgehiwet Giday Tesfay Gebremariam Tigray Agricultural Research Institute Alamata Agriculture Research CenterP.O.BOX 56AlamataEthiopia

Herbaceous species contribute to the largest proportion of the *** the profound benefits obtained,anthropogenic disturbances are hindering its *** the other hand,to ensure the sustainability of herbaceous species,communities and governments have been putting efforts in managing herbaceous species through the establishment of area exclosure(AE).Thus,the main importance of this research paper is to provide information about the role of AE on the restoration of herbaceous *** objective of this study was to assess the effect of restoration on the herbaceous species following AE established on communal grazing land(CGL).A total of 124 and 73 quadrats of 1×1m^(2) size were laid down at 50 m intervals along parallel transects at AE and CGL,respectively,and data were analyzed by t-test unequal variances using *** displayed higher plant species richness and diversity than the CGL and showed a significant difference(p<0.001).Similarly,the AE had significantly(p<0.001)higher forage biomass than the *** general,herbaceous species diversity index and species richness were significantly(p<0.001)higher in the AE compared to the *** study concluded that effective AE has the potential to enhance the restoration of herbaceous species and hence forage productivity.

关键词： Grazing land land conservation palatable indigenous vegetation area exclosure

Carbon stocks and sequestration potential of dry forests under community management in Tigray, Ethiopia

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Ecological Processes 2017年第1期6卷 203-213页

作者： Negasi solomon Emiru Birhane Tewodros Tadesse Anna C.Treydte Kiros Meles Department of Land Resources Management and Environmental Protection Mekelle UniversityP.O.Box 231MekelleEthiopia Faculty of Environment sciences and Natural Resources Management Norwegian University of Life SciencesP.O.Box 5003No-1432ÅsNorway Department of Natural Resources Economics and Management Mekelle UniversityP.O.Box 231MekelleEthiopia Agroecology in the Tropics and Subtropics University of HohenheimStuttgartGermany Nelson Mandela African Institution of Science and Technology ArushaTanzania World Agroforestry Centre(ICRAF) ILRI CampusP.O.Box 5689Addis AbabaEthiopia

Introduction:Forests form a major component of the carbon(C)reserves in the world’s ***,little is known on how management influences C stocks of woody vegetation,particularly in dry *** developed regression models for two dominant tree species to predict C stocks and quantified the potential of community managed forests as C ***:Plots were randomly selected from community-managed natural forest,herbivore exclosures,and from communal grazing *** and shrub biomass were estimated using a regression model on the most dominant woody species while herbaceous biomass was determined using destructive ***:The simplest model,based on only one single predictor variable,showed a good fit to the data for both species(Juniperus procera and Acacia abyssinica).Diameter at breast height(r2>0.95)was a more reliable predictor than height(r2>0.54),crown diameter(r2>0.68)(p<0.001).The C content of the total biomass for the managed natural forest and the exclosure were estimated as,58.11 and 22.29 Mg ha−1,respectively,while that for the grazing land was 7.76 Mg ha−1,and the mean carbon content between the three land uses were significantly different(p<0.05).Conclusions:We conclude that forests managed by the community have a high potential for C sequestration and storage and their conservation should be promoted.

关键词： Allometric functions Regression Dryland Livestock pressure Woody and grassy vegetation Exclosures

带容量约束的供应链物流运输调度问题的双层变邻域蝙蝠算法

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电子学报 2019年第7期47卷 1434-1442页

作者：戚远航蔡延光蔡颢杨亮 YAO yeboah 电子科技大学中山学院计算机学院广东中山528402 广东工业大学自动化学院广东广州510006 奥尔堡大学健康科学与工程系丹麦奥尔堡9220

本文考虑了多个供应商、多个制造商和多个零售商的三级供应链物流运输调度,以最大限度地降低采购、加工和运输成本为目标,提出了带容量约束的供应链物流运输调度模型(Capacitated Vehicle Routing Problem in Supply Chain,CVRPSC).进... 详细信息

本文考虑了多个供应商、多个制造商和多个零售商的三级供应链物流运输调度,以最大限度地降低采购、加工和运输成本为目标,提出了带容量约束的供应链物流运输调度模型(Capacitated Vehicle Routing Problem in Supply Chain,CVRPSC).进一步地,本文构造了求解CVRPSC的双层变邻域蝙蝠算法(Two-Level Bat Algorithm with Variable Neighborhood Search,TLBAVNS).该算法提出了一种双层蝙蝠位置的定义,引入了相应的蝙蝠算法的更新操作,采用变邻域局部搜索策略加强算法的寻优能力.实验证明:TLBAVNS能在合理的时间内求解CVRPSC;在大部分测试算例中,该算法相对于对比算法均表现出了更强的寻优能力和稳定性.

关键词：供应链车辆路径问题蝙蝠算法邻域搜索

Association between thrombotic risk factors and extent of fibrosis in patients with non-alcoholic fatty liver diseases

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World Journal of Gastroenterology 2005年第37期11卷 5834-5839页

作者： N Assy I Bekirov Y Mejritsky L solomon S Szvalb O Hussein Liver Unit and Internal Medicine A Sieff Hospital Safed Israel Technion Faculty of Medicine Haifa Israel Liver Unit and Internal Medicine B Sieff Hospital Safed Israel Department of HematologySieff Hospital SafedIsrael Department of PathologySieff Hospital Safed Israel

AIM: To evaluate the prevalence of genetic and acquired prothrombotic risk factors and their association with the extent of fibrosis and fatty infiltration in patients with non-alcoholic fatty liver disease (NAFLD).METHODS: Forty-four patients with chronic hepatitis (28 men and 16 women, with mean age of 45±11 and 49±12 years, respectively) constituted the patient population of this study. The groups were divided as follows: 15 patients with fatty liver (FL); 15 with non-alcoholic steatohepatitis (NASH); 14 with chronic viral hepatitis (CH) diagnosed by histology and liver technetium scan or ultrasound; and 10 healthy individuals. Thrombophilic, coagulation factors and genetic mutations were diagnosed by standard hemostatic and molecular coagulation ***: Activated protein C (APC) resistance and protein S were the most prevalent thrombotic risk factors (6% and 10% in NAFLD vs 21% and 14% in CH; P＜0.01 and P＜0.05, respectively). One thrombotic risk factor was identified in 41% of patients (23% mild fibrosis, 18% severe fibrosis) and two thrombotic risk factors in 6% of patients with NAFLD and severe fibrosis. While no differences in APC ratio, lupus anticoagulant, fibrinogen, factor V Leiden,prothrombin, and MTHFR mutation were found. Protein S levels were significantly lower in NASH patients than in patients with FL alone (92±19 vs106±2, P＜0.01). Protein C levels were markedly higher in patients with NAFLD and mild or severe fibrosis as compared to the patients with CH, respectively (128±40 vs96±14, P＜0.001 or 129±36 vs 88±13, P＜0.01).CONCLUSION: Up to 46% of patients with NAFLD may have thrombotic risk factors, and the presence of thrombotic risk factors is correlated with the extent of hepatic fibrosis,suggesting a crucial role of the coagulation system in the pathogenesis of hepatic fibrosis.

关键词： NASH NAFLD Thrombotic risk factors Fibrosis Protein S Protein C

A Robust Alternative Virtual Key Input Scheme for Virtual Keyboard Systems

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Journal of Computer and Communications 2016年第4期4卷 99-108页

作者： Prince Owusu-Agyeman Wei Xie Yao yeboah Department of Electrical and Computer Engineering School of Automation Science and Engineering South China University of Technology Guangzhou China

Towards virtual keyboard design and realization, the work in this paper presents a robust key input method for deployment in virtual keyboard systems. The proposed scheme harnesses the information contained within shadows towards robustifying virtual key input. This scheme allows for input efficiency to be guaranteed in situations of relatively lower illumination, a core challenge associated with virtual keyboards. Contributions of the paper are two-fold. Firstly the paper pre-sents an approach towards effectively applying shadow information towards robustifying virtual key input systems;Secondly, through morphological operations, the performance of this input method is boosted by means of effectively alleviating noise and its impacts on overall algorithm performance, while highlighting the necessary features towards an efficient performance. While previous contributions have followed a similar trend, the contribution of this paper stresses on the intensification and improvement of both shadow and finger-tip feature highlighting schemes towards overall performance improvement. Experimental results presented in the paper demon-strate the efficiency and robustness of the approach. The attained results suggest that the scheme is capable of attaining high performances in terms of accuracy while being capable of addressing false touch situations.

关键词： Virtual Input Shadow-Based Input Input Robustication Virtual Key Input

Application of SWAN model for storm generated wave simulation in the Canadian Beaufort Sea

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Journal of Ocean Engineering and Science 2020年第1期5卷 19-34页

作者： Md.Azharul Hoque William Perrie Steven M.solomon Natural Resources Canada Bedford Institute of OceanographyDartmouthNova Scotia B2Y 4A2Canada Fisheries and Ocean Canada Bedford Institute of OceanographyDartmouthNova Scotia B2Y 4A2Canada

The wave model SWAN(Simulating WAves Nearshore)is implemented for the Canadian Beaufort Sea and storm generated waves are investigated through comparisons between in situ buoy observations and numerical *** are performed for four storms using the SWAN wave *** specifically use SWAN’s non-stationary and two-dimensional modes in a fine resolution nested domain within a coarse resolution *** established whitecapping formulations in SWAN are examined;one is dependent on mean spectral wave steepness and the other is on local spectral *** simulations in the shallow fine resolution domain also consider the effects of bottom friction and nonlinear triad *** the Beaufort Sea study area,wave simulations in which the white capping formulation is dependent on local spectral steepness are better than those where the dependency is on mean spectral steepness;however implementation of bottom friction term and triad mechanisms in the present study does not lead to any notable enhancement in the simulations.

关键词： Arctic Ocean Beaufort Sea Mackenzie delta Storm waves SWAN.

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蓖麻耐镉性的生化鉴定和全基因组关联分析

蓖麻耐镉性的生化鉴定和全基因组关联分析

作者： Akwasi yeboah 广东海洋大学

学位级别：硕士

镉（Cd）是第7类生态毒性重金属,易溶水并易被植物吸收,会造成耕地、植物和水体污染。中国有13330公顷农田因受到镉严重污染而不能用于农业生产。培育耐镉品种是镉污染土壤植物修复有效途径。蓖麻（Ricinus communis L.）是一种非食用... 详细信息

镉（Cd）是第7类生态毒性重金属,易溶水并易被植物吸收,会造成耕地、植物和水体污染。中国有13330公顷农田因受到镉严重污染而不能用于农业生产。培育耐镉品种是镉污染土壤植物修复有效途径。蓖麻（Ricinus communis L.）是一种非食用油料作物,其根系强大、生物量高,对镉有较强的忍耐和富集能力及镉胁迫下的抗氧化能力。蓖麻耐镉的生理机制己有一些报道,但其耐镉的生化机制和遗传基础尚缺乏研究。本研究在175份蓖麻种质资源耐镉性鉴定基础上,以相对耐镉指数为指标,利用143对SSR分子标记对7个耐镉相关性状进行了全基因组关联分析,旨在鉴定蓖麻耐镉基因位点、发掘有益等位基因和可能的候选基因,并用q RT-PCR对6个候选基因进行了表达量分析,同时分析了极端耐镉材料和极端镉敏感材料间超氧化物歧化酶（SOD）、过氧化氢酶（CAT）、谷胱甘肽（GSH）及丙二醛（MDA）的表达差异,以期为揭示蓖麻耐镉的生化和遗传机制提供依据。结果如下:1、175份蓖麻种质资源7个耐镉相关性状的相对耐镉指数存在较大的变异,变幅在0.08～0.99之间,其中根干重对镉胁迫较为敏感,茎长耐镉性较高。2、143对SSR引物共扩增出736个等位基因,平均为5.10。平均基因多样性和多态信息含量分别为0.67和0.62。群体结构分析将175份种质分为3组,与系统发育分析结果一致。3、采用混合线性模型的全基因组关联分析法（Genomewide association study,GWAS）检测到27个显著的（-log10P＞1.5）耐镉基因位点,每位点解释了耐镉性表型变异的5.63%～20.47%,平均为12.31%。其中有10个位点与茎干重关联,1个与根长关联。有2个位点（分别以RCM223和RCM644标记）均与根鲜重和茎鲜重相关,表明基因的多效性。4、通过有益等位基因的挖掘,发现29份镉耐性种质和181份镉敏感性种质,这可能有助于蓖麻耐镉品种的培育。5、通过基因注释,共得到八个新的候选基因,与其中的六个性状相关联,它们参与应激反应和发育过程。q RT-PCR结果表明,候选基因在极端表型材料之间的表达量存在明显差异。基因PHT2;1在耐隔材料中高度表达,表明其在提高蓖麻耐镉性方面发挥着作用。6、SOD、CAT、GSH和MDA在极端耐镉材料16-024和镉敏感材料S2-4之间存在显著差异,证明耐镉材料具有较强的抗氧化能力。综上所述,镉毒性诱导蓖麻的抗氧化应激反应,增强了蓖麻的耐镉性,缓解了镉对蓖麻的毒性。但蓖麻的耐镉性在不同种质、不同性状或器官间存在广泛差异。本研究所鉴定出的候选基因在不同耐镉性材料间的表达存在遗传特异性。据我们所知,这是首次在镉胁迫下开展蓖麻耐镉基因的关联作图和新基因的鉴定。以上结果有助于研究蓖麻耐镉的生化和遗传机理、为克隆耐镉基因和培育耐镉品种提供参考,也为镉污染环境的植物修复提供依据。

关键词：蓖麻相对耐镉指数全基因组关联分析候选基因抗氧化剂

企业社交平台使用对员工绩效的影响 ——基于加纳中小型企业的实证研究

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企业社交平台使用对员工绩效的影响 —...

作者： ANTHEA yeboah 浙江工商大学

学位级别：硕士

Today’s companies deploy information technology to provide technological *** is triggered by the fact that these companies would gain indirect rewards,such as better *** this study,the researcher aims to find out how the introduction of enterprise social media platforms can positively influence the work environment and employee’s *** answer these research questions,an online survey was taken and distributed among 250 respondents of various *** find that business social networking channels interact with all facets of the work climate of *** perform better when they use teamwork which increases their work performance by becoming more efficient and also more *** into organizational networking,as well as team usage,the individual’s innovativeness is strongly *** conducting this research,it contributes to the literature by,for example,shedding light to the relationship between ESM platform usage and employee *** addition,showcasing the relevant ESM platform functionality that affect the teamwork usage and Organizational *** from these findings,the research has fascinating organizational consequences,which demonstrate how to improve performance.

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New Mathematical Modelling on BMR and Weight Prediction for Ghanaians

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E-Health Telecommunication Systems and Networks 2023年第4期12卷 78-90页

作者： Ian Yaw Asare Ezer Osei yeboah-Boateng Faculty of Computing & Information Systems Ghana Communication Technology University Accra Ghana Department of Computer Science & Technology Knutsford University College Accra Ghana

Background: Basal Metabolic Rate (BMR) is the quantum of calories needed for optimum body function when at rest. This has long been an indicator of one’s health and the basis for determining the metabolic age of individuals. Many scholastic projects have led to the establishment of mathematical models and inventions that measure the BMR and other body composition parameters. However, existing computations have limitations as they do not offer accurate results for Ghanaians. Aim: The purpose of the study was to model BMR metrics that are most suitable for Ghanaians and to investigate the effect of caloric difference on weight, Lean Body Mass (LBM) and % fat composition that can be implemented with Information Technology. Research Methods and Procedures: This was an experimental study that adopted a quantitative approach. BMR and body composition were measured in a sample of 242 Ghanaian adults (141 males and 101 females) from 19 to 30 years of age. Body composition was measured using bioelectrical impendence analysis (BIA) in all participants. Each participant was under study for 7 days. A simple linear regression model was used to examine associations between BMR/calorie intake and total body weight and LBM. Results: There was a significant statistical relation between BMR and LBM and between BMR and weight of both men and women. Equations for BMR and weight were established for males and females. Furthermore, caloric intake differences affected changes in total weight as well as differences in % fat composition. Caloric intake however did not affect the difference in LBM. Conclusion: Caloric difference had an impact on total body weight and Lean Body Mass. The model derived from the study predicts weight change and BMR of Ghanaians from 19 to 30 years of age. It is termed the Health and Age Monitoring System (HAMS).

关键词： Basal Metabolic Rate (BMR) Lean Body Mass (LBM) Weight Calories

A Review of the Logistic Regression Model with Emphasis on Medical Research

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Journal of Data Analysis and Information Processing 2019年第4期7卷 190-207页

作者： Ernest yeboah Boateng Daniel A. Abaye Department of Basic Sciences School of Basic and Biomedical Sciences University of Health and Allied Sciences Ho Ghana

This study explored and reviewed the logistic regression (LR) model, a multivariable method for modeling the relationship between multiple independent variables and a categorical dependent variable, with emphasis on medical research. Thirty seven research articles published between 2000 and 2018 which employed logistic regression as the main statistical tool as well as six text books on logistic regression were reviewed. Logistic regression concepts such as odds, odds ratio, logit transformation, logistic curve, assumption, selecting dependent and independent variables, model fitting, reporting and interpreting were presented. Upon perusing the literature, considerable deficiencies were found in both the use and reporting of LR. For many studies, the ratio of the number of outcome events to predictor variables (events per variable) was sufficiently small to call into question the accuracy of the regression model. Also, most studies did not report on validation analysis, regression diagnostics or goodness-of-fit measures;measures which authenticate the robustness of the LR model. Here, we demonstrate a good example of the application of the LR model using data obtained on a cohort of pregnant women and the factors that influence their decision to opt for caesarean delivery or vaginal birth. It is recommended that researchers should be more rigorous and pay greater attention to guidelines concerning the use and reporting of LR models.

关键词： Logistic Regression Model Validation Analysis Goodness-of-Fit Measures Odds Ratio Likelihood Ratio Test Hosmer-Lemeshow Test Wald Statistic Medical Research