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Recommender system for modelling subject combination in Ugandan senior secondary schools 乌干达高中学科组合建模推荐系统
Pub Date : 2020-06-08 DOI: 10.23954/osj.v5i2.2424
O. Fagbolu
Subject combinations at A-level in Ugandan Senior Secondary Schools have made or marred the future career of many prospective students, many students have ended up doing courses they had not planned to do because they made wrong choices at their A-level. This recommender system offers the decision-making process for students based on their subject performance coupled with interest, passion, skills and talents to enable them make right choices. It is person-centred and there are three (3) main actors: the student (who are interested in making appropriate career choice), the documents (which contains available information about interest and passion, skills and talents and subject performances) and access metrics (which aids the student of A-level in extracting knowledge from available resources). A hybrid matrix factorization model using ANFIS and R were used to represents students and subjects as linear combinations derived from their characteristics and interactions, this is combined with rule-based model to offer a unified approach of presenting any student with a list of subjects that will lead to prospective career choices. This offer higher predictive accuracy in career choice matchmaking and overcoming challenges of parental influence, peer influence and others while expanding opportunities of career guidance in Uganda. 
乌干达高中A-level的科目组合成就了或毁掉了许多未来学生的职业生涯,许多学生最终选择了他们没有计划的课程,因为他们在A-level考试中做出了错误的选择。这个推荐系统根据学生的学科表现、兴趣、热情、技能和才能,为学生提供决策过程,使他们做出正确的选择。它以人为本,有三(3)个主要参与者:学生(有兴趣做出适当的职业选择的人),文件(包含有关兴趣和激情,技能和才能以及学科表现的可用信息)和访问指标(帮助A-level学生从可用资源中提取知识)。使用ANFIS和R的混合矩阵分解模型来表示学生和受试者的线性组合,这些线性组合来源于他们的特征和相互作用,这与基于规则的模型相结合,提供了一种统一的方法,向任何学生展示将导致未来职业选择的科目列表。这在职业选择、配对和克服父母影响、同伴影响和其他方面的挑战方面提供了更高的预测准确性,同时扩大了乌干达的职业指导机会。
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引用次数: 0
Artificial insemination and cryopreservation of boar semen: current state and problematics 猪精液的人工授精与低温保存:现状与问题
Pub Date : 2020-06-03 DOI: 10.23954/osj.v5i2.2353
Joaquim Moreira da Silva
 Commercial artificial insemination with boar semen still prefers the usage of refrigerated semen up to 5 days over frozen-thawed, to date. This is because of the uneconomical properties of frozen-thawed boar semen, such as low motility, viability, fertility rates and the need for higher semen doses, because of the decreased quality after cryopreservation. Since boar semen is highly susceptive to cold shock damage, the invention of a successful cryopreservation method would be greatly beneficial for the swine industry. This review briefly focuses on the many factors that influence the quality of frozen-thawed boar semen, including the different compositions of extenders, comparison of commercial extenders, freezing and thawing methods (temperature and duration). It could be concluded from the present review that optimum freezing/thawing protocol for swine is not standardized, so far being the current status still considered poor-to-fair. 
商业人工授精与猪精液仍然倾向于使用冷藏精液长达5天,而不是冻融,到目前为止。这是因为冻融野猪精液的不经济特性,如低活力、活力、生育率和需要更高的精液剂量,因为冷冻保存后质量下降。由于猪精液对冷休克损伤非常敏感,因此一种成功的冷冻保存方法的发明将对养猪业大有裨益。本文简要介绍了影响冻融猪精液质量的诸多因素,包括膨化剂的不同组成、商品膨化剂的比较、冻融方法(温度和持续时间)。从目前的综述中可以得出结论,猪的最佳冻融方案没有标准化,目前的状况仍然被认为是差到公平的。
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引用次数: 1
Adaptation of positive youth development sustainability scale (PYDSS) 青年积极发展可持续性量表的适应性
Pub Date : 2020-06-03 DOI: 10.23954/osj.v5i2.2485
Ardiana Meilinawati, Endah Mastuti
This study aimed to determine the validity and reliability of the adaptation of Positive Youth Development Sustainability Scale (PYDSS). Positive Youth Development is an approach in the form of caring, supportive attitude, and tends to see adolescents as a source that must be developed to reduce the occurrence of behavioral problems (Nystrom, et al., 2008). There are five aspects of PYD or called the 5 Cs Model of PYD consisting of character, competence, connection, caring, and confidence (Lerner, 2005). The five aspects encourage the emergence of the sixth aspect is contribution (Sieng, et al., 2018). The focus of this research lies in the development of measuring instruments through the adaptation of PYDSS as a means to see the validity and reliability of the items in the PYDSS measurement tools. This study involved 242 subjects with age categories 15-18 years. The research instrument was in the form of a questionnaire consisting of 29 statement items. Quantitative data analysis techniques used are validity tests based on content using Content Validity Ratio (CVR) and Content Validity Index (CVI), validity tests based on internal structure using confirmatory factor analysis (CFA), and reliability tests based on homogeneity/internal consistency through Cronbach's coefficient alpha and construct/composite reliability (CR). The results of data analysis showed that the value of CVR almost met the minimum parameters of 0.952 < 0.99 where the average (CVI)> 0.8; loading factor> 0.5 except for items CH2, CN4, and HC1, and the suitability of the model that is quite fit with a value of χ2 / df> 2; SRMR <0.1; RMSEA <0.1; CFI> 0.8; TLI> 0.8; and p-value <0.05. Reliability test through the Cronbach's alpha coefficient shows a number> 0.9 and a CR value> 0.7. This shows that the adaptation of PYDSS measurement tools for high school adolescents in Surabaya fulfils good validity and reliability values. 
本研究旨在探讨积极青年发展可持续性量表(PYDSS)的效度与信度。积极的青少年发展是一种关心、支持态度的方法,倾向于将青少年视为必须发展的来源,以减少行为问题的发生(Nystrom等人,2008)。PYD有五个方面,或称为PYD的5c模型,包括性格,能力,联系,关怀和信心(Lerner, 2005)。这五个方面鼓励了第六个方面的出现(Sieng, et al., 2018)。本研究的重点在于通过PYDSS的适配来开发测量工具,以此作为衡量PYDSS测量工具中项目的效度和信度的手段。这项研究涉及242名年龄在15-18岁之间的研究对象。研究工具是一份由29个陈述项目组成的问卷。定量数据分析技术采用内容效度比(CVR)和内容效度指数(CVI)进行基于内容的效度检验,采用验证性因子分析(CFA)进行基于内部结构的效度检验,通过Cronbach系数α和结构/复合信度(CR)进行基于同质性/内部一致性的信度检验。数据分析结果表明,CVR值基本满足最小参数0.952 < 0.99,其中平均值(CVI)> 0.8;除CH2、CN4、HC1项外,加载因子均> 0.5,模型适宜性较好,χ2 / df> 2;SRMR 0.8;TLI > 0.8;p值为0.9,CR值> 0.7。这表明,PYDSS测量工具对泗水市高中生的适应性达到了良好的效度和信度值。
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引用次数: 0
COVID-19 from Food Safety and Biosecurity Perspective 从食品安全和生物安全的角度看COVID-19
Pub Date : 2020-06-02 DOI: 10.2174/1874256402012010001
S. Salem, P. Jagadeesan
Most recently emerged pneumonia of unknown cause named COVID-19 has a devastating impact on public health and economy surpassing its counterparts in morbidity and mortality. Asymptomatic spread appears to be prevalent in China from where it is originated, lacking a clear and precise understanding of the transmission dynamics. Precautionary approach on certain ethnic food from mammalian sources like bats and its possible transmission source has been presented. Biosecurity measures should also be considered. The application of accurate predictive modeling in the alleviation of infectious diseases has also been discussed. The COVID-19 outbreak seems to be an alarming lesson to the global community to start preparing for an open, transparent, and coordinated action by all relevant stakeholders.
最近出现的原因不明的肺炎COVID-19对公共卫生和经济造成的破坏性影响在发病率和死亡率方面超过了同类肺炎。在中国,无症状传播似乎很普遍,但缺乏对传播动态的清晰和准确理解。对蝙蝠等哺乳动物来源的某些民族食品及其可能的传播源提出了预防措施。还应考虑生物安全措施。本文还讨论了准确预测建模在传染病防治中的应用。2019冠状病毒病疫情似乎给国际社会上了一个令人震惊的教训,要开始为所有利益攸关方采取公开、透明和协调一致的行动做准备。
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引用次数: 4
Panel data analysis of employment and unemployment in Sub-Saharan Africa and its impact on annual percentage change in GDP growth 撒哈拉以南非洲就业和失业的面板数据分析及其对国内生产总值增长年度百分比变化的影响
Pub Date : 2020-05-29 DOI: 10.23954/osj.v5i2.2394
Gideon Kweku Appiah, K. Prempeh, Shadrack Benn, E. Oduro
ABSTRACTSub-Sahara Africa has over the years been exposed to diverse arguments and agitations about the provision of employment to alleviate poverty in the sub region with the aim of achieving full employment. Whereas some economists and bibliographers believe of the significant impact that employment and unemployment have on annual percentage change in GDP growth, some do not. The main objective of the study is to access the impact that employment and unemployment have on annual percentage change in GDP growth in Sub-Saharan African countries. World Development Indicator (WDI) data was collected from the World Bank from the year 2000 to 2014 for the purpose of the study. A sample of 12 sub-Saharan African countries were randomly selected using a random number generator and variables taken. Two statistical models were used; the Pooled Ordinary Least Square (OLS) regression model and the Least Square Dummy Variable (LSDV) regression model with fixed effect was used to empirically access impact that employment and unemployment have on annual percentage change in GDP growth. Both the Pooled Ordinary Least Square regression model and the Least Square Dummy Variable regression model tested to be statistically significant but LSDV regression model explained a greater percentage of the variability of the model than the Pooled OLS for employment on GDP growth rate. The pooled OLS regression model was not statistically significant at 5% level of significance in assessing the impact that unemployment has on annual percentage change in GDP growth. Further empirical analysis of the study also revealed a positive relationship between annual percentage change in GDP growth and employment for the female population (Empl15+Female), employment rate for the male population (Empl15+Male) and employment rate for the Total Youth population (Empl15-24 total). Also, an inverse relationship existed between unemployment male youth population (15-24years), and female youth population (15-24years) on annual percentage change in GDP growth. The study can be improved by considering other factors that impact GDP growth other than employment and unemployment.Keywords: Employment, Unemployment, GDP growth rate, Pooled OLS, LSDV
【摘要】撒哈拉以南非洲地区多年来一直存在各种关于提供就业以减轻该地区贫困并实现充分就业的争论和骚动。尽管一些经济学家和书目编纂者相信就业和失业对GDP增长的年度百分比变化有重大影响,但有些人却不这么认为。这项研究的主要目的是了解就业和失业对撒哈拉以南非洲国家国内生产总值增长的年度百分比变化的影响。世界发展指标(WDI)数据收集自世界银行2000年至2014年的研究目的。使用随机数生成器和变量随机选择了12个撒哈拉以南非洲国家的样本。采用两种统计模型;采用固定效应的混合普通最小二乘(OLS)回归模型和最小二乘虚拟变量(LSDV)回归模型,实证考察了就业和失业对GDP年增长百分比变化的影响。混合普通最小二乘回归模型和最小二乘虚拟变量回归模型均经检验具有统计学显著性,但LSDV回归模型比混合OLS更能解释就业对GDP增长率的变变性百分比。在评估失业对GDP增长的年度百分比变化的影响时,混合OLS回归模型在5%的显著性水平上没有统计学意义。进一步的实证分析也揭示了GDP增长的年度百分比变化与女性人口就业率(Empl15+ female)、男性人口就业率(Empl15+ male)和青年总人口就业率(Empl15-24 Total)之间的正相关关系。失业男性青年人口(15-24岁)和失业女性青年人口(15-24岁)对GDP年增长率的变化呈负相关。考虑就业和失业以外影响GDP增长的其他因素,可以改进研究。关键词:就业,失业,GDP增长率,汇总OLS, LSDV
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引用次数: 1
Aerosol blocking assessment by different types of fabrics for homemade respiratory masks: spectroscopy and imaging study 自制呼吸面罩不同面料对气溶胶阻隔的评估:光谱和成像研究
Pub Date : 2020-05-27 DOI: 10.1101/2020.05.26.20100529
M. Foschini, A. Monte, A. C. Mendes, R. J. Scarabucci, A. Maletta, C. D. Giuliani, B. A. Duarte, K. Del‐Claro
During the COVID-19 pandemic, there is no agreement, until the current date, about the recommendations of homemade face mask use for the general population, and one of the reasons is a lack of information about their real protective rule on spreading aerosols and viruses. This is a comparative study regarding the relative efficiencies of commercial respiratory masks (medical masks) and homemade fabric masks, which may guide authorities across the globe, following the 'Advice on the use of masks in the context of COVID-19', by the World Health Organization. We described two optical methodologies for charactering respiratory masks. It happens that the aerosol scattering coefficient is linear as a function of its concentration inside the mask chamber. Quantitative optical properties of scattering for a large batch fabrication of masks were demonstrated, making the mask N95 suitable for use as a reference standard.
在COVID-19大流行期间,直到目前为止,对于普通人群使用自制口罩的建议还没有达成一致意见,原因之一是缺乏有关其对气溶胶和病毒传播的真正保护规则的信息。这是一项关于商用呼吸口罩(医用口罩)和自制织物口罩相对效率的比较研究,可以指导全球各国当局遵循世界卫生组织的“关于在COVID-19背景下使用口罩的建议”。我们描述了表征呼吸面罩的两种光学方法。气溶胶散射系数与掩膜腔内气溶胶浓度呈线性关系。实验证明了N95型掩模的散射定量光学特性,适合作为参考标准。
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引用次数: 0
Behavior of scientific production on severe acute respiratory syndrome 严重急性呼吸综合征的科学生产行为
Pub Date : 2020-05-22 DOI: 10.1590/scielopreprints.548
Ce Cheng, T. Q. Louro, Daniel Aragão Machado, Roberto Carlos Lyrada Silva, Andrea Dos Santos Garcia, Carlos Silva
Objective: To analyze the dispersion of journals and scientific collaboration on Severe Acute Respiratory Syndrome, available on the Web of Science. Methods: Bibliometric study that analyzed the production of documents available on the Web of Science, from 1989 to 2020. Results: 1623 documents were retrieved, distributed in 538 journals. The average production per year was 55.9. The average production per author was 1.73. The Nursing category contributed 17 (1.04%) documents, with Virology being the largest contribution 324 (19.96%). China led the ranking with 640 publications (39.43%). Conclusion: The data presented demonstrate the high level of interest of the scientific community in the subject. It was possible to identify 82 authors composing an Elite group of Authors, whose productivity was 66.1%. The United States, China and Saudi Arabia are the countries that most formed Collaboration Networks
目的:分析Web of Science上关于严重急性呼吸系统综合征的期刊分布和科学合作情况。方法:文献计量学研究分析了1989年至2020年Web of Science上可用文献的生产情况。结果:共检索文献1623篇,分布于538种期刊。年平均产量为55.9。每位作者的平均产量为1.73。护理类文献贡献17篇(1.04%),病毒学文献贡献最大(324篇(19.96%))。中国以640篇(39.43%)位居榜首。结论:所提供的数据显示了科学界对该主题的高度兴趣。精英作者群(Elite group of authors)共鉴定出82位作者,其生产率为66.1%。美国、中国和沙特阿拉伯是组建协作网络最多的国家
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引用次数: 0
Environmentally sustainable governance model to improve the ewaste management in Mexico City 环境可持续治理模式改善墨西哥城的电子垃圾管理
Pub Date : 2020-04-02 DOI: 10.23954/osj.v5i1.2333
H. Cano
In this age of technology, where the use of this is excessive and its exponential growth has given rise to a series of challenges and opportunities caused by the accumulation of waste electrical and electronic equipment in Mexico City. For its treatment, more practical approaches have been necessary, taking into account proper management and long-term well-being as a main element of sustainability. The objective of this work is to propose sustainable initiatives based on social, economic and environmental dimensions, based on the challenges faced by waste management of electrical and electronic equipment as one of the fields that contribute to the transition towards a sustainable society. Data from each dimension were analyzed to extract the most relevant challenges by reviewing the literature and identifying sources that relate them to the life cycle of electrical and electronic waste. As a result, a governance model for waste electronic and electronic devices was obtained to support environmental sustainability that identifies lines of action for the effective treatment of waste electrical and electronic equipment highlighting awareness, education, knowledge and regulations as well as processes environmental. From this it is concluded that the governance of waste electrical and electronic equipment is mandatory for the integration of economic, social and environmental factors to efficiently leverage efforts on environmental care.
在这个技术时代,它的使用是过度的,它的指数级增长带来了一系列的挑战和机遇,这些挑战和机遇是由墨西哥城废旧电器和电子设备的积累引起的。为了治疗这种疾病,必须采取更实际的办法,同时考虑到适当的管理和长期福利是可持续性的主要因素。这项工作的目标是提出基于社会、经济和环境方面的可持续倡议,基于电气和电子设备的废物管理所面临的挑战,作为促进向可持续社会过渡的领域之一。通过回顾文献并确定与电气和电子废物生命周期相关的来源,对每个维度的数据进行了分析,以提取最相关的挑战。结果,获得了一个废弃电子和电子设备的治理模式,以支持环境的可持续性,确定有效处理废弃电子和电气设备的行动方针,强调意识、教育、知识和法规以及环境过程。由此得出的结论是,对废旧电器电子设备的治理是强制性的,以整合经济,社会和环境因素,有效地利用环境保护的努力。
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引用次数: 0
A Systematic Review of Contract Farming, and its Impact on Broiler Producers in Lebanon 黎巴嫩合同养殖的系统回顾及其对肉鸡生产者的影响
Pub Date : 2020-03-24 DOI: 10.20944/preprints202003.0359.v1
Rodrique Kozhaya
This Thesis has been realized within the agribusiness sector and experiments the Transaction Cost Theory a branch of the New Institutional Economy which explain market failure caused by many factors. Transaction costs are associated with carrying a transaction between buyers and sellers. This study has been conducted between 2014 and 2017; and has collected data from 11 broiler producers in Jezzine, Lebanon, about: Production costs, capital investment, revenues, land tenure, access to infrastructure, and information about the contract. The propensity score matching method is used to compare the effect of participating in contract farming and to solve the hypotheses, which say: There is a positive relationship between contract farming and the economic benefits of broiler producers and the development of the broiler sector in Jezzine District. Findings from farmer’s interviews indicated that sustainability, guaranteed price, risk reduction, credit facilities and technical aids are the main reasons for signing a contract. In contrast, Farmers have expressed problems concerning the contractors’ responsibilities such as delay in payment and delivery. Also, when prices are high, it was argued that farmers were selling the products in the open market.
本文以农业综合企业为研究对象,对新制度经济学的一个分支——交易成本理论进行了实验,该理论解释了多种因素导致的市场失灵。交易成本与买卖双方进行交易有关。这项研究是在2014年至2017年间进行的;并从黎巴嫩Jezzine的11家肉鸡生产商那里收集了有关生产成本、资本投资、收入、土地使用权、基础设施使用情况和合同信息的数据。采用倾向得分匹配方法比较了参与合同养殖的效果,并解决了假设:合同养殖与Jezzine地区肉鸡生产者的经济效益和肉鸡产业发展之间存在正相关关系。农民访谈的结果表明,可持续性、保证价格、降低风险、信贷设施和技术援助是签订合同的主要原因。相比之下,农民则表达了有关承包商责任的问题,如延迟付款和交货。此外,当价格高时,有人认为农民是在公开市场上出售产品。
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引用次数: 2
Teff could contribute to the Sustainable Goals of United Nation’s Goals in low-income areas of Middle East and North Africa Teff可以为中东和北非低收入地区的联合国可持续发展目标做出贡献
Pub Date : 2020-02-19 DOI: 10.23954/osj.v5i1.2221
A. Golmohamadi, R. A. Yazdi, K. Kita
Several Sustainable Development Goals of the United Nation are directly or indirectly related to nutrition, including SDG1 (no poverty) and SDG2 (zero hunger). Many parts of the Middle East and North Africa (MENA) region are experiencing poverty or suffering from micronutrient (Calcium, Iron, and Vitamin D) deficiencies, which has contributed to a high mortality rate among children and pregnant women. Teff, an old and well-known grain in MENA and a “Super Grain” in developed countries, has a strong potential to be utilized in food product development activities in MENA. These new products can be produced by local scientists and be sold domestically or internationally. The aim of this short communication is to review the limitations and opportunities that exist in the process of food product development with Teff. Several Sustainable Development Goals of the United Nation are directly or indirectly related to nutrition, including SDG1 (no poverty) and SDG2 (zero hunger). Many parts of the Middle East and North Africa (MENA) region are experiencing poverty or suffering from micronutrient (Calcium, Iron, and Vitamin D) deficiencies, which has contributed to a high mortality rate among children and pregnant women. Teff, an old and well-known grain in MENA and a “Super Grain” in developed countries, has a strong potential to be utilized in food product development activities in MENA. These new products can be produced by local scientists and be sold domestically or internationally. The aim of this short communication is to review the limitations and opportunities that exist in the process of food product development with Teff.
联合国的几个可持续发展目标与营养直接或间接相关,包括可持续发展目标1(无贫困)和可持续发展目标2(零饥饿)。中东和北非(MENA)地区的许多地方正在经历贫困或缺乏微量营养素(钙、铁和维生素D),这是造成儿童和孕妇死亡率高的原因之一。苔麸是中东和北非地区一种古老而知名的谷物,也是发达国家的“超级谷物”,在中东和北非地区的食品开发活动中具有很强的利用潜力。这些新产品可以由当地科学家生产,并在国内或国际上销售。这篇简短交流的目的是回顾在食品产品开发过程中存在的限制和机会。联合国的几个可持续发展目标与营养直接或间接相关,包括可持续发展目标1(无贫困)和可持续发展目标2(零饥饿)。中东和北非(MENA)地区的许多地方正在经历贫困或缺乏微量营养素(钙、铁和维生素D),这是造成儿童和孕妇死亡率高的原因之一。苔麸是中东和北非地区一种古老而知名的谷物,也是发达国家的“超级谷物”,在中东和北非地区的食品开发活动中具有很强的利用潜力。这些新产品可以由当地科学家生产,并在国内或国际上销售。这篇简短交流的目的是回顾在食品产品开发过程中存在的限制和机会。
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引用次数: 1
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The Open Food Science Journal
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