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Remote Access Communications Security: Analysis of User Authentication Roles in Organizations

Journal of Information Security 2020年第3期11卷 161-175页

作者： Ezer Osei yeboah-Boateng Grace Dzifa Kwabena-Adade Faculty of Computing & Information Systems (FoCIS) Ghana Technology University College Accra Ghana

Remote access is a means of accessing resources outside one’s immediate physical location. This has made employee mobility more effective and productive for most organizations. Remote access can be achieved via various channels of remote communication, the most common being Virtual Private Networks (VPNs). The demand for remote access is on the rise, especially during the Covid-19 pandemic, and will continue to increase as most organizations are re-structuring to make telecommuting a permanent part of their mode of operation. Employee mobility, while presenting organizations with some advantages, comes with the associated risk of exposing corporate cyber assets to attackers. The remote user and the remote connectivity technology present some vulnerabilities which can be exploited by any threat agent to violate the confidentiality, integrity and availability (CIA) dimensions of these cyber assets. So, how are users and remote devices authenticated? To what extent is the established connection secured? With employee mobility on the rise, it is necessary to analyze the user authentication role since the mobile employee is not under the monitoring radar of the organization, and the environment from which the mobile employee connects may be vulnerable. In this study, an experiment was setup to ascertain the user authentication roles. The experiment showed the process of 2FA in user authentication and it proved to be an effective means of improving user authentication during remote access. This was depicted via the use of what the user has (mobile phone/soft-token) as a second factor in addition to what the user knows, i.e. password. This authentication method overcomes the security weaknesses inherent in single-factor user authentication via the use of password only. However, the results also showed that though 2FA user authentication ensures security, the remote devices could exhibit further vulnerabilities and pose serious risks to the organization. Thus, a varied impl

关键词： Remote Access Communications Security User Authentication 2FA Virtual Private Network (VPN) Telecommuting Threats Vulnerabilities

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Asexual Propagation of Sheanut Tree (<i>Vitellaria paradoxa</i>C.F. Gaertn.) Using a Container Layering Technique

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American Journal of Plant Sciences 2013年第9期4卷 1758-1765页

作者： Naalamle Amissah Brain Akakpo Julius yeboah Essie Blay Cocoa Research Institute of Ghana (CRIG) Bole Ghana. Department of Crop Science College of Agriculture and Consumer Sciences University of Ghana Accra Ghana

In spite of the economic potential of the sheanut tree (Vitellaria paradoxa), its domestication still has not been achieved due to the long juvenile period of seed propagated plants and the absence of a reliable vegetative propagation method. Three experiments were conducted by using a modified container layering technique to investigate the effects of season (rainy and dry season), light treatments (etiolation and natural light) and indole 3-butyric acid (IBA) on root formation in juvenile and mature sheanut trees. The effect of light treatments on the internal conditions such as level of sugars (soluble, insoluble and total sugars) and total free phenols in layered sheanut shoots was also considered. Rooting was generally lower in the mature trees (27.9%) compared to that in juvenile 4 year-old plants (40.9%). Etiolation increased the levels of total sugars and phenols in shoots of 4-year-old plants and mature fruit bearing trees, but this increase did not significantly enhance rooting in both the juvenile and mature sheanut trees. The container layering technique holds promise as a method for the asexual propagation of sheanut planting material. Roots formed using this method looked healthy and were vertically orientated giving layered shoots a better chance at survival.

关键词： Etiolation Container Layering Technique Indolebutyric Acid Sheanut Tree

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淘宝网对加纳电子商务的影响分析

淘宝网对加纳电子商务的影响分析

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作者： KYEI EMMANUEL yeboah 西南科技大学

学位级别：硕士

本文对淘宝的商业模式进行了调查和分析,并对加纳的电子商务行业和整个商业环境产生了重大影响,突出了他们使用电子商务个性化框架实现的个性化技术(展示了利用电子商务个性化技术理论分析网站的活动。此外,SWOT模型分析也讨论了业务的... 详细信息

本文对淘宝的商业模式进行了调查和分析,并对加纳的电子商务行业和整个商业环境产生了重大影响,突出了他们使用电子商务个性化框架实现的个性化技术(展示了利用电子商务个性化技术理论分析网站的活动。此外,SWOT模型分析也讨论了业务的内部和外部因素,用于分析淘宝的运营情况。它还强调了加纳电子商务行业的地位,政府用适当的工具和复杂的机器推进国家技术的努力,这些机制是一种辅助网上交易的手段。阻碍和挑战幸存的电子商务网站的挑战。对淘宝网整个系统的活动进行了彻底的研究和分析,以确定它对加纳在线商品和服务的买卖可能产生的影响。该研究封装了有关客户对网站个性化活动的行为的要求。在本研究中,使用用户的购买历史记录,浏览历史记录,用户偏好,现场行为和个人数据,为每个客户提供个性化体验。结果显示,淘宝网站采用各种个性化技术来提高受众群体的忠诚度,提高转化率,增加销售额。SWOT分析还表明淘宝网目前和未来的地位是安全可靠的。该框架有望帮助未来的研究人员和从业人员理解现有的电子商务个性化工作,并开发新颖的个性化方法。

关键词：电子商务淘宝个性化 B2C C2C

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不同耕作措施对旱作农田土壤水稳性团聚体稳定性的影响

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中国生态农业学报 2018年第3期26卷 329-337页

作者：武均蔡立群张仁陟齐鹏张军 yeboah STEPHEN 甘肃农业大学资源与环境学院兰州730070 甘肃农业大学甘肃省干旱生境作物学重点实验室兰州730070 甘肃省节水农业工程技术研究中心兰州730070 加纳作物研究所库马西3785

为了探明陇中黄土高原旱作农田土壤水稳性团聚体崩解机制,以连续进行15年的不同耕作措施长期定位试验为研究对象,利用LB湿筛法(快速湿润法、慢速湿润法和预湿润后扰动法)和传统湿筛法探索了传统耕作(T)、传统耕作+秸秆还田(TS)、免耕(NT... 详细信息

为了探明陇中黄土高原旱作农田土壤水稳性团聚体崩解机制,以连续进行15年的不同耕作措施长期定位试验为研究对象,利用LB湿筛法(快速湿润法、慢速湿润法和预湿润后扰动法)和传统湿筛法探索了传统耕作(T)、传统耕作+秸秆还田(TS)、免耕(NT)、免耕+秸秆覆盖(NTS)4种耕作措施对陇中黄土高原旱作农田土壤水稳性团聚体稳定性的影响及其破坏机制。结果表明:不同耕作措施下,4种湿筛法处理后,快速湿润法>预湿润后扰动法>慢速湿润法;4种湿筛法处理后,团聚体平均重量直径排序为:慢速湿润法>预湿润后扰动法>快速湿润法>传统湿筛法;不同耕作措施下,土壤团聚体相对崩解指数高于相对机械破坏指数。不同湿筛法处理后,在0~5 cm和5~10 cm土层均以NTS的水稳性团聚体含量和平均重量直径最高,且NTS处理的平均重量直径显著(P≤5%)高于NT和T处理;而10~30 cm土层,TS处理的水稳性团聚体含量和平均重量直径最高,且显著高于T处理的平均重量直径,但与NTS处理的平均重量直径无显著差异。不同耕作措施下的团聚体崩解指数和机械破坏指数均以T处理最高,NT次之,NTS处理最低。秸秆对0~5cm、5~10 cm、10~30 cm土层的团聚体崩解指数和机械破坏指数的降低均具有显著效应,而免耕仅在0~5 cm土层具有显著效应。因此,该区水稳性团聚体分散主要是由于水分入渗而引起的,且快速湿润时的破坏最大;同时,NTS处理可有效提升土壤水稳性团聚体稳定性,更有利于该区农田水土保持。

关键词：旱作农田秸秆还田免耕 Le Bissonnais法土壤水稳性团聚体相对崩解指数相对机械破坏指数

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Effect of Indole 3-Butyric Acid and Media Type on Adventitious Root Formation in Sheanut Tree (<i>Vitellaria paradoxa</i>C. F. Gaertn.) Stem Cuttings

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American Journal of Plant Sciences 2014年第3期5卷 313-318页

作者： Daniel Brain Akakpo Naalamle Amissah Julius yeboah Essie Blay Cocoa Research Institute of Ghana (CRIG) Bole Ghana Department of Crop Science College of Agriculture and Consumer Sciences University of Ghana Accra Ghana

Shea nuts play an important role in food security for rural folks within sub-Sahara Africa, serving as the main source of income for many people living in Northern Ghana. Unfortunately, the full economic potential of the Sheanut tree has not been fully realized due to the difficulty involved in its domestication. This difficulty in vegetatively propagating sheanut trees has greatly hindered its cultivation and the realization of its true economic potential. Two experiments were conducted to investigate the effects of rooting media and varying indole 3-butyric acid (IBA) concentrations on adventitious root formation in cuttings taken from coppiced sheanut trees. Results indicated that 3000 ppm produced significantly (p 0.05) better rooting (57.5%) than 5000 ppm (30%), 7000 ppm (45.0%) and the control (7.5%). Although the levels of soluble sugars (SS) and total free phenols (TFP) in the cutting were significantly (p 0.05) higher at the end of the experiment (after IBA treatment) compared to the start (prior to IBA treatment), the SS and TFP trends observed did not clearly explain the rooting differences found between the IBA levels investigated. Callus formation was significantly (p 0.05) higher (35.0%) in the control (no IBA). Generally, callus formation decreased with increasing IBA concentration. In the rooting media experiment, rooting was significantly (p 0.05) higher in the rice husk medium (35.0%) compared to that in the palm fiber (18.3%), saw dust (14.1%) and top soil (16.7%) media.

关键词： Coppiced Indole 3-Butyric Acid Sheanut Tree Cuttings Rooting Medium

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Effect of Partial Replacement of Ordinary Portland Cement (OPC) with Ghanaian Rice Husk Ash (RHA) on the Compressive Strength of Concrete

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Open Journal of Civil Engineering 2020年第4期10卷 353-363页

作者： Derrick Nii-Laryea Botchway Russell Owusu Afrifa Charles yeboah Henaku Civil Engineering Department Takoradi Technical University Takoradi Ghana Civil Engineering Department Kwame Nkrumah University of Science & Technology Kumasi Ghana

The cost of cement has made concrete production expensive such that the housing deficit in developing countries is on the rise despite all the efforts by governments and other stakeholders to produce affordable housing units for the populace. Ashes of agricultural products such as rice husk, known as mineral admixtures may have pozzolanic characteristics which would be more beneficial to the housing industry in terms of strength gain and economy than being pollutants to the environment. Rice Husk Ash (RHA), because of its finely divided form and very high silica content and amorphousness, proved to be useful for strength gain of Rice Husk Ash Concrete (RHAC). Rice husk ash was manufactured by uncontrolled burning, ground, sieved and replaced with cement at 0%, 5%, 10%, 15%, 20% and 25% in mass for the mixes C20, C25, C30 and C35 where their compressive strengths were verified at 3, 7, 14, 21, 28, 56, 90 and 180 days. The X-ray diffraction pattern list indicated amorphous as well as diffused peak of about 8000 counts of SiO2 representing crystalline structures identified as cristobalite. A physical examination of the RHA showed very fine appearance, grey color and specific gravity of 2.06. The chemical analysis also revealed the existence of oxide content to be 55.8% representing 0.78% of Fe2O3, 54% of SiO2 and 1.06% of Al2O3 representing 20.23% lower than the minimum value of 70% required for pozzolans. Gen

关键词： Rice Husk Ash Agricultural Waste Mineral Admixture Pozzolanic Activity Compressive Strength

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Assessing Localized Contamination Hazard and Groundwater Quality Challenges in Water-Stressed Peri-Urban Accra, Ghana

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Journal of Geoscience and Environment Protection 2022年第1期10卷 13-28页

作者： Stephen Twumasi Annan Bright Frimpong Collins Owusu-Fordjour Bismark yeboah Boasu Department of Integrated Science Education Faculty of Science Education University of Education Winneba Ghana Department of Programmes Planning Monitoring and Evaluation Environmental Protection Agency Accra Ghana Department of Environment and Resource Studies SD Dombo University of Business and Integrated Development Studies Wa Ghana

The study assesses the quality of hand dug wells in relation to distance from soakaway septic tanks in three selected peri-urban communities in the Ga West Municipality near Accra, Ghana. Water quality analyses of bio-physico-chemical variables (pH, Temperature, EC, turbidity, DO, BOD, TSS, TDS, sodium, potassium, nitrate, nitrite, ammonia, sulphate, chloride, salinity, total alkalinity, total coliform, fecal coliforms and isolation of E. coli) were determined. Concentrations of the major nutrient anion sulphate, nitrate, phosphate, and chlorides in water samples at distances between 0 - 30 m radial distances from the septic tank were above the WHO permissible limit of drinking water compared to the control. All the water samples had high fecal and total coliform counts that exceeded the international standard of 0 per 100 mL of potable water with counts ranging from 0 - 143 cfu/100 ml and 53 - 463/100 ml for FC and TC respectively. High fecal coliform and detection of E. coli in most samples is an indication of fecal pollution possibly from their close proximity to soak away septic sewage. The high nutrient levels detected in samples at distances between 0 - 30 m as compared to the controls may a

关键词： Groundwater Water Quality Localized Contamination Peri-Urban

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启动子PpetE与Pcpc560对集胞藻PCC 6803生物合成乙醇的影响

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生物技术通报 2022年第2期38卷 141-149页

作者：叶鹏林 Kwasi Kyere-yeboah 高恶斌江苏大学环境与安全工程学院镇江212000

为了增加工程集胞藻PCC 6803的乙醇合成产量,通过选用强启动子Pcpc560 驱动并提高外源乙醇合成基因(pdc,yqhD)的表达,从而促进乙醇的生产。具体方法利用同源双交换引入来源于运动型发酵单胞菌的丙酮酸脱羧酶基因(pdc)与来源于大肠杆菌的... 详细信息

为了增加工程集胞藻PCC 6803的乙醇合成产量,通过选用强启动子Pcpc560 驱动并提高外源乙醇合成基因(pdc,yqhD)的表达,从而促进乙醇的生产。具体方法利用同源双交换引入来源于运动型发酵单胞菌的丙酮酸脱羧酶基因(pdc)与来源于大肠杆菌的NADPH依赖型醛还原酶基因(yqhD)并选用不同的启动子来驱动其表达。通过逆转录定量PCR分析,比较在不同启动子驱动的情况下,外源乙醇合成基因(pdc,yqhD)的表达情况并检测相应突变株的乙醇产量。结果显示相较于中等启动子,铜离子诱导启动子PpetE,来源于集胞藻PCC 6803的光强启动子Pcpc560显著促进了外源乙醇合成基因(pdc,yqhD)的表达,并增加了工程菌株乙醇合成的产量。超强启动子Pcpc560搭配pdc,yqhD的组合表达,显著提高了工程菌株的乙醇合成产量。

关键词：乙醇启动子集胞藻PCC 6803 合成逆转录

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Effect of Partial Replacement of Coarse Aggregate with Electronic Waste Plastic in Light Weight Concrete

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Journal of Management Science & Engineering Research 2022年第2期5卷 38-44页

作者： Derrick Nii-Laryea Botchway John Bentil Charles yeboah Henaku Civil Engineering Department Takoradi Technical UniversityTakoradiGhana

This study assessed the usefulness of the replacement of coarse aggregate partially with electronic waste(e-waste)plastic in lightweight concrete since developing countries have been challenged with management of e-waste as well as high cost of coarse aggregates for concrete *** aggregates were replaced with e-waste plastic in concrete at 5%,10%,15%,and 20% for a concrete class of *** particle size distribution of the e-waste plastic aggregates was determined as well as the slump,compressive strength,water absorption and bulk density of the ***,the slump decreased as the e-waste *** compressive strengths decreased for the 5%and 10%replacement of coarse aggregates with e-waste but increased for the 15% and 20% replacement of coarse aggregate with e-waste.0% water absorption was obtained for the 15% and 20% e-waste content while the 10%e-waste concrete obtained 0.01% and the 5% e-waste obtaining of 0.013% after 28days of *** densities of 5%,10%,15% and 20% e-waste plastic content decreased as compared to the 0% e-waste plastic *** values of compressive strength obtained showed that coarse aggregate replacements by e-waste plastic at 15% and 20% may be appropriate for lightweight concrete of class C20/25 since compressive strengths ranged between 16.09 Nmm^(-2) and 22.87 Nmm^(-2).This implies that partial replacement of coarse aggregate with e-waste plastic may be useful for lightweight concrete as well as helping in eradicating the environment of the menace of e-waste plastic.

关键词： Electronic waste Plastics Compressive strength Coarse aggregate Concrete

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Sustainability Assessment of Smallholder Farms in the Savannah Transition Agro-Ecological Zone of Ghana

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Agricultural Sciences 2021年第11期12卷 1185-1214页

作者： Johnny Kofi Awoonor Edward yeboah Bright Fafali Dogbey Fowzia Adiyah Soil Genesis Survey and Classification Division CSIR-Soil Research Institute Kumasi Ghana Soil Microbiology Division CSIR-Soil Research Institute Kumasi Ghana Department of Soil Resources Management CSIR College of Science and Technology Accra Ghana Department of Soil Science Szent István University G&#246 dö llő Hungary

The ever-increasing human population has resulted in political pressure to increase crop production. Currently, smallholder farmers are expected to be environmentally considerate, adapt to extreme climatic conditions and deal with financial instability. Despite these recent developments, farmers and their farming activities in these rural environs of developing countries need to improve household food and income security on a sustainable basis. A minimum data set selected from extensive data was used to determine indicators for soil sustainability assessment. This method involved expert opinion and statistical data reduction techniques. The results indicated that SOC, MBC, BS, EC, Spo and sand were the most important variables selected as MDS using PC analysis. Forest and Grassland had a high sustainability index (SI) while Savannah woodland, Fallow and Cropland were rated not sustainable (NS). For Cumulative rating using the total dataset (CR-TDS), Forest had a high sustainability index (HS), Savannah woodland and Grassland were sustainable (S) compared to Fallow and Cropland, which were sustainable with high input (SWHI). Also, for cumulative rating using the minimum dataset (CR-MDS), Forest, Savannah woodland and Grassland had high sustainability (SH) indices compared to Fallow and Cropland, which were considered sustainable with high input (SWHI). Sustainability index (SI) and Cumulative rating (CR) using the total dataset (CR-TDS) had a strong correlation (R2 = 0.91, p 2 = 0.44, p 2 = 0.60, p < 0.05). These methods consider that these management goals dictate soil functions affecting the selection of indicators. Using PCA and variance analysis, silt, clay, EC, SOC, MBC and CEC relating to soil texture and fertility were identified as the most influential (sensitive) indicators for soil sustainability assessment. The selected soil attributes can serve as ta

关键词： Sustainability Land Use Principal Component Analysis Sustainability Index Smallholder Farms

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