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Hidden Constructs on Graduate Employability Decisions: The Principal Component Factor

Open Journal of Statistics 2021年第5期11卷 720-736页

作者： Anthony Joe Turkson Cynthia Ama mensah Esi Ahema Aboagye Mathematics Statistics and Actuarial Science Department Takoradi Technical University Sekondi-Takoradi Ghana

This study adopted the quantitative research design to unearth hidden factors which go into graduate employability decisions. Purposive sampling technique was used to select graduates, institutions and industries within Takoradi, Cape Coast, Kumasi and Accra metropolis all in Ghana. Three different questionnaires inter-spaced with interviews were designed and used to collect data from the field according to a pre-determined stratified scheme. A total of 200 informants including 68 industries, 120 graduates and 12 institutions were used. The data was coded and keyed into SPSS version 20. Tables and Charts were used to explore the data. Principal component (PC) analysis was employed to extract hidden factors industries consider in graduate employability decisions. The PC method identified and extracted six hidden factors: ability to set SMART goals and structure actions;ability to demonstrate a willingness to embrace new systems, processes, technology and ideas;a determined, committed, resilient, and focused person;a person with passion for driving profit;ability to deconstruct a problem or situation;and clear and unprompted ability to present information to a group. These six hidden factors could explain 68.8% of the variances in graduate employability decisions. We recommend that internships be properly planned and executed with the involvement of industry players, facilitators of learning, and the ministry of trade and industries. In addition, facilitators should inculcate into students’ important traits and attributes identified in this study.

关键词： Competency-Based Training Graduate Employability Decisions Internships Principal Component Analysis Sustainable Employments

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加纳的经济增长对自然资源依赖的实证分析

加纳的经济增长对自然资源依赖的实证分析

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作者： mensah JACOB ATIAPAH（门萨）首都经济贸易大学

学位级别：硕士

本研究运用计量经济学技术中一个简单的时间序列研究了自然资源依赖与GDP增长(经济增长)之间的关系。所有的回归分析都是用Eviews完成的。对于时间序列单根和协整的检验表明,当时间序列趋于静止时,上述两个变量之间存在长期均衡关系。...

本研究运用计量经济学技术中一个简单的时间序列研究了自然资源依赖与GDP增长(经济增长)之间的关系。所有的回归分析都是用Eviews完成的。对于时间序列单根和协整的检验表明,当时间序列趋于静止时,上述两个变量之间存在长期均衡关系。我们用矿产资源租赁占GDP的比重作为自然资源依赖的代理变量。三项回归分析中的两项都表明这一代理变量在统计上是显著的且与经济增长正相关。在三项回归分析中的两项,广义货币(金融发展的代理变量)一直是明显的负系数且与经济增长负相关。在所有评估的模型中,除了广义货币为负系数外,其他指标都为明显的正系数。资源诅咒理论认为自然资源依赖/自然资源丰裕对经济增长有负面影响,我们认为该理论不能用于加纳这个国家,至少不能用于本研究中所涵盖的这一阶段。我们建议货币政策应跟提高生产率和鼓励进出口替代的政策一样得到加强,以逆转广义货币对GDP增长的负面效应。我们也鼓励强健成熟的金融体系、合理协调自然资源财富和货币政策,以防止货币升值,因为货币升值可能对贸易部门产生不利影响从而导致增长放缓。

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软件定义车载网络下任务卸载和资源分配联合优化研究

软件定义车载网络下任务卸载和资源分配联合优化研究

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作者： mensah RICHARD NANA KOJO 江苏大学

学位级别：硕士

车载自组织网络(VANETs)作为智能交通系统(ITSs)的关键技术受到了学术界和工业界的广泛关注。随着车辆应用和数据的爆炸式增长对当前数据通信、算力、存储资源、网络延迟以及无线网络容量都提出了更高的性能需求。为了应对新的性能需求... 详细信息

车载自组织网络(VANETs)作为智能交通系统(ITSs)的关键技术受到了学术界和工业界的广泛关注。随着车辆应用和数据的爆炸式增长对当前数据通信、算力、存储资源、网络延迟以及无线网络容量都提出了更高的性能需求。为了应对新的性能需求挑战,车载边缘计算(VEC)被认为是一种解决当前矛盾的新型计算范式,它将计算能力下沉到车辆网络的边缘,允许车辆中的路边单元(RSU)和车载单元(OBU)等节点执行具有位置感知和低延迟需求的服务。此外,车载边缘计算还能有效地缓解网络上大量数据请求造成的网络拥塞。车载边缘任务卸载是实现车载边缘任务处理这一美好愿景的关键技术问题。然而,由于车辆节点的强移动性及拓扑的频繁变化给车载任务卸载和任务处理带来新的技术挑战。文章的主要工作如下:首先,采用博弈论方法设计了一种任务卸载决策模型以优化VEC环境下的任务处理能力。在这种场景下,移动节点通过测试连接一组边缘计算服务器,在本地自主地决定应该选择哪台边缘服务器节点进行卸载,以便优化执行计算任务的序列。鉴于此,将任务卸载决策过程建模为一个博弈模型。其次,VEC与VANET中的设备到设备(D2D)任务卸载相结合,以受益于邻近增益并优化计算卸载。开发了软件定义车载边缘计算网络(SD-VEN),通过感知全局网络状态信息实现对网络的全局优化。SD-VEN中的控制器能够协调端边云之间的资源优化部署和处理,协调D2D配对和通信,以实现车辆节点与移动用户之间灵活分配计算资源。对该模型的研究可以优化车辆网络在通信和计算受限制情况下资源分配。在此,将任务卸载和相关的资源分配联合优化问题形式化为一个混合策略的博弈问题。第三,采用资源池的概念,通过将车辆及其乘客设备可用的边缘计算资源集中在一起,来增强系统的容量。数值评估讨论了所提出模型与随机卸载、均匀卸载、边缘任务卸载和最近邻对等任务卸载等情形下的模型性能差距。定性和定量分析了任务卸载对参与者效用的影响。实验结果表明,如果卸载的任务数保持不变,则可以有效地达到平衡。此外,在动态任务卸载的仿真实验中,实验结果表面博弈仍然能够收敛到均衡,一旦博弈达到接近稳定的状态,只需进行少量的策略更改。综上所述,文章将任务卸载决策过程建模为一个博弈模型,首次提出将D2D引入到车载边缘计算网络中,在不增加额外成本的情况下,增强了网络系统的容量且提高边缘资源的利用率。之后,还将SDN网络引入到该场景下,通过SDN控制器感知网络交互状态实现全局网络的最优任务卸载和全局资源的最优化管理。理论和实验结果均表明,文章提出的基于博弈的车载任务卸载策略可以在优化任务卸载决策方面发挥重要的作用。数值仿真结果显示所提出的模型实现的平均处理时间比现有方法提高了25%。

关键词：边缘计算车载任务卸载软件定义网络博弈论多设备智能互联

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Experimental and Computational Study of the Microwave Absorption Properties of Recycled α-Fe2O3/OPEFB Fiber/PCL Multi-Layered Composites

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Journal of Materials Science and Chemical Engineering 2022年第3期10卷 30-41页

作者： Ebenezer Ekow mensah Raba’ah Syahidah Azis Zulkifly Abbas Department of Integrated Science Education Faculty of Science Education Akenten Appiah-Menka University of Skills Training and Entrepreneurial Development Mampong Ashanti Ghana Department of Physics Faculty of Science Universiti Putra Malaysia Selangor Malaysia Institute of Advanced Materials Universiti Putra Malaysia Selangor Malaysia

The aim of this study was to fabricate multi-layered recycled α-Fe2O3/OPEFB fiber/PCL composites for microwave absorbing applications in the 1 - 4 GHz frequency range. The multi-layered composites were 6 mm thick and each consisted of a 2 mm thick layer of recycled α-Fe2O3/PCL composites at various loadings (5 wt% - 25 wt%) of 16.2 nm recycled α-Fe2O3 nanofiller, placed between two layers of 2 mm thick OPEFB fiber/PCL composites blended at a fixed ratio of 7:3. The real (ε') and imaginary (ε") components of the relative complex permittivity were measured using the open-ended coaxial probe technique and the values obtained were applied as inputs for the Finite Element Method to calculate the reflection coefficient magnitudes from which the reflection loss (RL) properties were determined. Both ε' and ε" increased linearly with recycled α-Fe2O3 nanofiller content and the values of ε' varied between 3.0 and 3.9 while the ε" values ranged between 0.26 and 0.64 within 1 - 4 GHz. The RL (dB) showed the most prominent values within the 1.38 - 1.46 GHz band with a minimum of -38 dB attained by the 25 wt% composite. Another batch of minimum values occurred in the 2.39 - 3.49 GHz range with the lowest of -25 dB at 2.8 GHz. The recycled α-Fe2O3/OPEFB fiber/PCL multi-layered composites are promising materials that can be engineered for solving noise problems in the 1 - 4 GHz range.

关键词： Multi-Layered Composites Recycled α-Fe2O3 Reflection Loss OPEFB Fiber Relative Complex Permittivity

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High-Frequency Electric Field Induced Nonlinear Electron Transport in Chiral Carbon Nanotubes

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World Journal of Condensed Matter Physics 2015年第4期5卷 294-300页

作者： Sulemana S. Abukari Samuel Y. mensah Musah Rabiu Kofi W. Adu Natalia G. mensah Anthony Twum Alfred Owusu Kwadwo A. Dompreh Patrick mensah-Amoah Matthew Amekpewu Department of Physics Laser and Fibre Optics Centre University of Cape Coast Cape Coast Ghana Department of Applied Physics University for Development Studies Navorongo Ghana Department of Physics The Pennsylvania State University-Altoona Altoona USA Materials Research Institute The Pennsylvania State University University Park USA Department of Mathematics University of Cape Coast Cape Coast Ghana

We investigate theoretically the high frequency complex conductivity in carbon nanotubes that are stimulated axially by a strong inhomogeneous electric field of the form E(t)=E0+E1cos(ωt). Using the kinetic approach based on Boltzmann’s transport equation with constant relaxation time approximation and the energy spectrum of the electron in the tight-binding approximation, together with Bhatnagar-Gross-Krook collision integral, we predict high-frequency nonlinear effects along the axial and the circumferential directions of the carbon nanotubes that may be useful for the generation of high frequency radiation in the carbon nanotubes.

关键词： Carbon Nanotubes High Frequency Electric Field Electric Current Density Complex Conductivity

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The Cox Proportional Hazard Regression Model Vis-à-Vis ITN-Factor Impact on Mortality Due to Malaria

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Open Journal of Statistics 2021年第6期11卷 931-962页

作者： Anthony Joe Turkson John Awuah Addor Francis Ayiah-mensah Department of Mathematics Statistics and Actuarial Science Takoradi Technical University Takoradi Ghana

This study has provided a starting point for defining and working with Cox models in respect of multivariate modeling. In medical researches, there may be situations, where several risk factors potentially affect patient prognosis, howbeit, only one or two might predict patient’s predicament. In seeking to find out which of the risk factors contribute the most to the survival times of patients, there was the need for researchers to adjust the covariates to realize their impact on survival times of patients. Aside the multivariate nature of the covariates, some covariates might be categorical while others might be quantitative. Again, there might be cases where researchers need a model that has the capability of extending survival analysis methods to assessing simultaneously the effect of several risk factors on survival times. This study unveiled the Cox model as a robust technique which could accomplish the aforementioned cases. An investigation meant to evaluate the ITN-factor vis-à-vis its contribution towards death due to Malaria was exemplified with the Cox model. Data were taken from hospitals in Ghana. In doing so, we assessed hospital in-patients who reported cases of malaria (origin state) to time until death or censoring (destination stage) as a result of predictive factors (exposure to the malaria parasites) and some socioeconomic variables. We purposefully used Cox models to quantify the effect of the ITN-factor in the presence of other risk factors to obtain some measures of effect that could describe the relationship between the exposure variable and time until death adjusting for other variables. PH assumption holds for all three covariate

关键词： Baseline Hazard Cox Model Hazard Function Hazard Ratio Survival Function

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加纳科学与工业研究理事会的组织信任对员工创新行为的影响研究

加纳科学与工业研究理事会的组织信任对员工创新行为的影响研究

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作者： NAA MORKOR DZORMO mensah 江苏大学

学位级别：硕士

为了研究组织信任、变革型领导与员工创新行为之间关系的本质,本研究调查了加纳水研究部科学与工业研究委员会,共收集了270份问卷,通过相关分析证实了组织信任对员工创新行为具有的积极影响,并验证了变革型领导的中介作用。本研究分别... 详细信息

为了研究组织信任、变革型领导与员工创新行为之间关系的本质,本研究调查了加纳水研究部科学与工业研究委员会,共收集了270份问卷,通过相关分析证实了组织信任对员工创新行为具有的积极影响,并验证了变革型领导的中介作用。本研究分别对组织信任、员工创新行为和变革型领导的显著性构成因素进行评价,运用单样本均值t检验分结果显示。上述变量之间存在显著的正相关关系:(一)公司的良好动机和意图,公司的坦诚和开放氛围,对员工的公平对待,给予员工帮助和支持,关心员工福利和员工对公司的信任是显著提高员工对各自所处研究机构信任度的主要变量,以便为公司创收方面更多提出创新的想法。(二)员工表现出的重大创新行为包括:不断提出新的、创造性的工作改进方案,认真筹措预算资金,积极争取资金支持,完成创新相关思路,制定实施新想法的详细计划和完成该计划的时间表。(三)允许员工从全新的方式看待过去的问题,激励员工做超出预期的事情,允许员工以不同的方式解决同一问题,使员工同其领导在完成公司工作时,对其所使用的领导风格感到满意,领导者强调利用只是克服障碍等对变革型领导具有重要意义。研究结果表明,组织信任通过变革型领导的中介来营造组织环境,从而激励员工的创新。此外,在分析受访者在该工作的年限时,发现大多数员工通常在公司工作的时间并不长。这时由于公司不断招聘新员工,而老员工要么追求更高的学历深造,要么被调到了公司的其他地区进行工作。

关键词：组织信任员工创新行为变革型领导创新创造力人力资源管理

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Design and Simulation of an Audio Signal Alerting and Automatic Control System

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Communications and Network 2023年第4期15卷 98-119页

作者： Winfred Adjardjah John Awuah Addor Wisdom Opare Isaac mensah Ayipeh Department of Electrical and Electronic Engineering Takoradi Technical University Takoradi Ghana Department of Mathematics Statistics and Actuarial Science Takoradi Technical University Takoradi Ghana

A large part of our daily lives is spent with audio information. Massive obstacles are frequently presented by the colossal amounts of acoustic information and the incredibly quick processing times. This results in the need for applications and methodologies that are capable of automatically analyzing these contents. These technologies can be applied in automatic contentanalysis and emergency response systems. Breaks in manual communication usually occur in emergencies leading to accidents and equipment damage. The audio signal does a good job by sending a signal underground, which warrants action from an emergency management team at the surface. This paper, therefore, seeks to design and simulate an audio signal alerting and automatic control system using Unity Pro XL to substitute manual communication of emergencies and manual control of equipment. Sound data were trained using the neural network technique of machine learning. The metrics used are Fast Fourier transform magnitude, zero crossing rate, root mean square, and percentage error. Sounds were detected with an error of approximately 17%;thus, the system can detect sounds with an accuracy of 83%. With more data training, the system can detect sounds with minimal or no error. The paper, therefore, has critical policy implications about communication, safety, and health for underground mine.

关键词： Emergency Response Emergency Management Team Audio Signal Alerting Automatic Control System Uni Pro XL Manual Communication Fast Fourier Transform Magnitude Zero Crossing Rate Root Means Square

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THE BRAIDY BUNCH

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The World of Chinese 2019年第4期 66-68页

作者： I. T. OPOKU-mensah HATTY LIU 不详

In a hair salon in the heart of Beijing, rapper Xie Qin, who performs under the stage name Mila, poses defiantly in a swivel chair while two stylists braid her hair extensions.

关键词： THE BRAIDY BUNCH a hair salon the heart

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Evaluation of Fuel Properties of Six Tropical Hardwood Timber Species for Briquettes

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Journal of Sustainable Bioenergy Systems 2014年第1期4卷 1-9页

作者： Stephen J. Mitchual Kwasi Frimpong-mensah Nicholas A. Darkwa Department of Construction and Wood Technology Education University of Education Winneba Kumasi Campus Kumasi Ghana Department of Wood Science and Technology Kwame Nkrumah University of Science and Technology Kumasi Ghana

The fuel potential of six tropical hardwood species namely: Triplochiton scleroxylon, Ceiba pentandra, Aningeria robusta, Terminalia superba, Celtis mildbreadii and Piptadenia africana were studied. Properties studied included species density, gross calorific value, volatile matter, ash content, organic carbon and elemental composition. Fuel properties were determined using standard laboratory methods. The result indicates that the gross calorific value (GCV) of the species ranged from 20.16 to 22.22 MJ/kg and they slightly varied from each other. Additionally, the GCV of the biomass materials were higher than that of other biomass materials like;wheat straw, rice straw, maize straw and sugar cane. The ash and volatile matter content varied from 0.6075 to 5.0407%, and 75.23% to 83.70% respectively. The overall rating of the properties of the six biomass materials suggested that Piptadenia africana has the best fuel property to be used as briquettes and Aningeria robusta the worse. This study therefore suggests that a holistic assessment of a biomass material needs to be done before selecting it for fuel purpose.

关键词： Ash Content Briquette Calorific Value Elemental Composition Species Volatile Matter

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