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Stochastic demand of production-inventory system with shortage 具有短缺的生产-库存系统的随机需求
Pub Date : 2019-08-21 DOI: 10.1063/1.5121034
Ali Khaleel Dhaiban, Nazrina Aziz
We consider the stochastic demand of an inventory system with defective items and the weekly demand, according to the Poisson process. Our objective is to formulate a Markov decision model to minimize the total expected cost, which includes production, holding, defective, and shortage. Markov decision model is formulated to describe the stochastic demand. Also, we show two strategies for disposal of defective items; the first one at the end of the week, and the second one continues during the week. The production rate represents a function of inventory, which has limited capacity. The results show a decrease in the shortage cost and increase in the production rate, in the case of disposal of defective items continues during the week.We consider the stochastic demand of an inventory system with defective items and the weekly demand, according to the Poisson process. Our objective is to formulate a Markov decision model to minimize the total expected cost, which includes production, holding, defective, and shortage. Markov decision model is formulated to describe the stochastic demand. Also, we show two strategies for disposal of defective items; the first one at the end of the week, and the second one continues during the week. The production rate represents a function of inventory, which has limited capacity. The results show a decrease in the shortage cost and increase in the production rate, in the case of disposal of defective items continues during the week.
根据泊松过程,考虑了有缺陷物品库存系统的随机需求和周需求。我们的目标是建立一个马尔可夫决策模型,以最小化总预期成本,其中包括生产,持有,次品和短缺。建立了马尔可夫决策模型来描述随机需求。此外,我们展示了两种处理次品的策略;第一个在一周结束时,第二个在一周内继续。生产率是库存的函数,而库存的产能是有限的。结果表明,在一周内继续处理次品的情况下,短缺成本降低,生产率提高。根据泊松过程,考虑了有缺陷物品库存系统的随机需求和周需求。我们的目标是建立一个马尔可夫决策模型,以最小化总预期成本,其中包括生产,持有,次品和短缺。建立了马尔可夫决策模型来描述随机需求。此外,我们展示了两种处理次品的策略;第一个在一周结束时,第二个在一周内继续。生产率是库存的函数,而库存的产能是有限的。结果表明,在一周内继续处理次品的情况下,短缺成本降低,生产率提高。
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引用次数: 3
Effects of eight weeks traditional archery training on heart rate variability among sedentary youth 八周传统射箭训练对久坐青少年心率变异性的影响
Pub Date : 2019-08-21 DOI: 10.1063/1.5121145
Mohd Azrul Anuar Zolkafi, N. Nordin, M. A. Sahar, Noor Aien Monsarip, Hayati Abd Rahman
Heart rate variability (HRV) provides information of cardiac autonomic control which indicates the interaction of sympathetic and parasympathetic nervous system. The purpose of this study was to investigate the effects of eight weeks traditional archery training on heart rate variability among sedentary lifestyle youth. Thirty-four inactive male (performed 0.05). In other hand, both groups showed non-significant difference on SDNN value after eight weeks of intervention (p > 0.05). However, the traditional archery group has showed an improvement of SDNN value meanwhile control group was declined. Eight weeks of traditional archery training programme was effective improving heart rate variability among sedentary lifestyle youth. Therefore, traditional archery could be proposed as one of the possible methods to combat poor cardiac autonomic function following sedentary lifestyle.Heart rate variability (HRV) provides information of cardiac autonomic control which indicates the interaction of sympathetic and parasympathetic nervous system. The purpose of this study was to investigate the effects of eight weeks traditional archery training on heart rate variability among sedentary lifestyle youth. Thirty-four inactive male (performed <150 minutes moderate to vigorous physical activity (MVPA)/week) were randomly assigned into two groups; traditional archery (n = 17) and control (n = 17) groups. An intervention group involved in three days weekly of traditional archery programme for eight weeks. In contrast, a control group requested to continue their regular physical activities. Measurement of HRV were assessed using baroreflex testing (15 seconds blow activities against 40mmHg sphygmomanometer followed by 15 seconds rest). Paired T-test was employed to investigate the effects of eight weeks intervention programme. Through eight weeks, the LF/HF ratio for the intervention group showe...
心率变异性(HRV)提供了心脏自主控制的信息,表明交感神经系统和副交感神经系统的相互作用。这项研究的目的是调查八周传统射箭训练对久坐生活方式的年轻人心率变异性的影响。34名非运动男性(执行0.05)。另一方面,两组干预8周后SDNN值差异无统计学意义(p < 0.05)。而传统射箭组的SDNN值有所提高,而对照组则有所下降。八周的传统射箭训练计划有效地改善了久坐生活方式的年轻人的心率变异性。因此,传统的射箭可以作为一种可能的方法来对抗久坐生活方式导致的心脏自主功能不佳。心率变异性(HRV)提供了心脏自主控制的信息,表明交感神经系统和副交感神经系统的相互作用。这项研究的目的是调查八周传统射箭训练对久坐生活方式的年轻人心率变异性的影响。34名不运动的男性(每周进行<150分钟的中度至剧烈体育活动(MVPA))随机分为两组;传统射箭组(n = 17)和对照组(n = 17)。干预组参加为期八周的传统射箭项目,每周三天。相比之下,对照组要求继续他们的常规体育活动。使用气压反射测试评估HRV的测量(对40mmHg血压计进行15秒的吹风活动,然后休息15秒)。采用配对t检验调查8周干预方案的效果。经过8周,干预组的LF/HF比率显示…
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引用次数: 2
Enhancing critical reflection in higher education 加强高等教育的批判性反思
Pub Date : 2019-08-21 DOI: 10.1063/1.5121131
Norakmarul Ihsan Sabtu, Rohani Matzin, Rosmawijah Jawawi, J. H. Jaidin
The study examined the use of reflective journals as a mechanism to facilitate the process of reflection. In particular, it focuses on the level of reflective thinking that the students were commonly engaged in their reflective journals. Participants of this research study comprised of 12 students who were enrolled in a foundation programme at a local university in Brunei Darussalam. The main instrument used for data collection was students’ reflective journals. Each student submitted 5 reflective journals for this research. Based on the analyses of the students’ reflective journals, it was found that the students were engaged in different levels of reflective thinking, which varied from a lower to a higher level of reflection. This study also found that there were improvements in the reflective practice among the students. This study has implication on the use of reflective journals in the teaching and learning processes in higher education.The study examined the use of reflective journals as a mechanism to facilitate the process of reflection. In particular, it focuses on the level of reflective thinking that the students were commonly engaged in their reflective journals. Participants of this research study comprised of 12 students who were enrolled in a foundation programme at a local university in Brunei Darussalam. The main instrument used for data collection was students’ reflective journals. Each student submitted 5 reflective journals for this research. Based on the analyses of the students’ reflective journals, it was found that the students were engaged in different levels of reflective thinking, which varied from a lower to a higher level of reflection. This study also found that there were improvements in the reflective practice among the students. This study has implication on the use of reflective journals in the teaching and learning processes in higher education.
这项研究考察了使用反思日志作为促进反思过程的机制。特别地,它关注的是学生在他们的反思性日记中通常从事的反思性思维水平。这项研究的参与者包括12名参加文莱达鲁萨兰国当地一所大学预科课程的学生。数据收集的主要工具是学生的反思日志。每位学生为这项研究提交了5本反思期刊。通过对学生反思性日志的分析,发现学生的反思性思维存在不同的层次,从较低的反思到较高的反思。本研究还发现,学生在反思性练习方面也有进步。本研究对反思性期刊在高等教育教学过程中的使用具有启示意义。这项研究考察了使用反思日志作为促进反思过程的机制。特别地,它关注的是学生在他们的反思性日记中通常从事的反思性思维水平。这项研究的参与者包括12名参加文莱达鲁萨兰国当地一所大学预科课程的学生。数据收集的主要工具是学生的反思日志。每位学生为这项研究提交了5本反思期刊。通过对学生反思性日志的分析,发现学生的反思性思维存在不同的层次,从较低的反思到较高的反思。本研究还发现,学生在反思性练习方面也有进步。本研究对反思性期刊在高等教育教学过程中的使用具有启示意义。
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引用次数: 2
Four types of dependence relationship in two consecutive stage data envelopment analysis model 连续两阶段数据包络分析模型中的四种依赖关系
Pub Date : 2019-08-21 DOI: 10.1063/1.5121032
A. S. A. Aminuddin, N. Abu, M. M. Kasim, M. Nawawi
Data Envelopment Analysis (DEA) model usually does not consider the interaction between the decision making units (DMU). The interaction can be represented in the form of two consecutive stages in which the outputs from the precedent stage will be the inputs for the latter stage. The two consecutive stage DEA model can be represented as Non-separable DEA (NS-DEA) which integrates both desirable and undesirable output. The undesirable output unlike desirable output, indicates a higher efficiency if the output is lower or not productive. The different orientation between desirable and undesirable output may affect the efficiency score especially if it was formed in two consecutive stages. Thus, this research attempts to address four different types of dependence relationship which can occur in the formation of two consecutive stage DEA models and to investigate the impact towards the overall efficiency of the DMUs. The finding shows that the determination of positive or negative correlation between the two stages which combines both desirable and undesirable output, are more likely to be influenced by the orientation of the first precedent stage.Data Envelopment Analysis (DEA) model usually does not consider the interaction between the decision making units (DMU). The interaction can be represented in the form of two consecutive stages in which the outputs from the precedent stage will be the inputs for the latter stage. The two consecutive stage DEA model can be represented as Non-separable DEA (NS-DEA) which integrates both desirable and undesirable output. The undesirable output unlike desirable output, indicates a higher efficiency if the output is lower or not productive. The different orientation between desirable and undesirable output may affect the efficiency score especially if it was formed in two consecutive stages. Thus, this research attempts to address four different types of dependence relationship which can occur in the formation of two consecutive stage DEA models and to investigate the impact towards the overall efficiency of the DMUs. The finding shows that the determination of positive or negative correlation between the two ...
数据包络分析(DEA)模型通常不考虑决策单元(DMU)之间的相互作用。这种相互作用可以用两个连续阶段的形式来表示,其中前一阶段的输出将成为后一阶段的输入。连续两阶段的DEA模型可以表示为不可分DEA (non -分离式DEA, NS-DEA),它集成了期望输出和不期望输出。不期望产出与期望产出不同,如果产出较低或没有生产力,则表示效率较高。理想产出和不理想产出的不同取向会影响效率得分,特别是在连续两个阶段形成的情况下。因此,本研究试图解决在两个连续阶段DEA模型形成过程中可能出现的四种不同类型的依赖关系,并探讨其对决策单位整体效率的影响。研究结果表明,两个阶段之间的正相关或负相关的确定,结合了理想和不希望的输出,更有可能受到第一个先例阶段的取向的影响。数据包络分析(DEA)模型通常不考虑决策单元(DMU)之间的相互作用。这种相互作用可以用两个连续阶段的形式来表示,其中前一阶段的输出将成为后一阶段的输入。连续两阶段的DEA模型可以表示为不可分DEA (non -分离式DEA, NS-DEA),它集成了期望输出和不期望输出。不期望产出与期望产出不同,如果产出较低或没有生产力,则表示效率较高。理想产出和不理想产出的不同取向会影响效率得分,特别是在连续两个阶段形成的情况下。因此,本研究试图解决在两个连续阶段DEA模型形成过程中可能出现的四种不同类型的依赖关系,并探讨其对决策单位整体效率的影响。这一发现表明,两者之间正相关或负相关的测定…
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引用次数: 0
Symmetric and asymmetric exchange rate exposure: Evidence from Malaysian non-financial firms 对称和不对称汇率风险:来自马来西亚非金融公司的证据
Pub Date : 2019-08-21 DOI: 10.1063/1.5121133
W. Suhaimi, H. A. Wahab, Rabihah Md. Sum
Despite minimal exchange rate exposure previously found in developed region, comprehensive study on the level of exchange rate exposure in a small open economy such as Malaysia remains scarce. Additionally, ignoring the direction of currency movement inflicts bias in estimation due to the commingling of positive and negative exposure. Hence, this paper examines the symmetric and asymmetric exchange rate exposure of 207 Malaysian non-financial firms at both aggregate and firm levels. Employing data from 1995 to 2016, the panel analysis found significant aggregate stock returns exposure to changes in the USD, mainly due to the strong US position as Malaysia’s major trading partner. Next, the firm-level analysis involving regression with GARCH(1,1) specification concludes that 35.75% of our sample firms are affected by the symmetric exposure. The higher exposure of Malaysia sample firms relative to western economies reflects the lack of hedging exercises and considerably moderate growth of derivatives market in Malaysia. In term of asymmetric exposure, there are large proportions of firms significantly affected by the USD appreciation. Inclusion of five sub-periods comprising two financial crises and pegging regime into the analyses indicates different significance levels throughout the periods. The detailed results of the study offer better insights for firm manager in making strategic decisions towards effective currency exposure management.
尽管以前在发达地区发现的汇率风险敞口最小,但对马来西亚等小型开放经济体的汇率风险敞口水平的全面研究仍然很少。此外,忽略货币运动的方向会造成估计偏差,因为混合了正面和负面的风险。因此,本文考察了207家马来西亚非金融企业在总体和企业层面的对称和不对称汇率风险敞口。利用1995年至2016年的数据,小组分析发现,由于美国作为马来西亚主要贸易伙伴的强势地位,美元的变化对总股票回报的影响很大。接下来,涉及GARCH(1,1)规范回归的公司层面分析得出结论,我们的样本公司中有35.75%受到对称暴露的影响。马来西亚样本公司相对于西方经济体的较高敞口反映了马来西亚衍生品市场缺乏对冲操作和相当温和的增长。在不对称风险敞口方面,有很大比例的公司受到美元升值的显著影响。将包括两次金融危机和钉住制度在内的五个分时期纳入分析,表明各个时期的显著程度不同。该研究的详细结果为公司经理制定有效的货币风险管理战略决策提供了更好的见解。
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引用次数: 2
Projection of retirement adequacy with withdrawals and investment elements using simulation approach 用模拟方法预测退休时的提款和投资因素
Pub Date : 2019-08-21 DOI: 10.1063/1.5121109
R. I. Alaudin, N. Ismail
The issue of whether Malaysians are adequately prepared for costs of their future retirements has been the subject of significant debate and research over the last few years, especially for those who contributing under defined contribution (DC) plan, since the contributors under this plan are allowed in managing some portion of their savings. The contributors are allowed to withdraw or invest during contribution (working) period, according to rules and regulations. Therefore, the objective of this study is to estimate the retirement wealth adequacy of future retirees under the DC plan in Malaysia using wealth-need ratio model and simulation approach. There are four simulated wealth-need ratio models projecting with several feasible scenarios, including an optimistic scenario involving more investment activities (more-investments) and a pessimistic scenario including no or less investment activities (more-savings), based on several related assumptions. The results show that 43% of households are projected to have adequate retirement benefits under the pessimistic scenario, while 94% of households are projected to have adequate retirement benefits under the optimistic scenario. In addition, three hybrid models are constructed to provide more realistic scenarios of Malaysian population, by developing three samples with different proportions of households with more-investments, and households with more-savings. The results show that 80% of households with higher proportion of more-investments households have adequate retirement benefits, while only 65% of households with higher proportion of more-savings households have adequate retirement benefits.The issue of whether Malaysians are adequately prepared for costs of their future retirements has been the subject of significant debate and research over the last few years, especially for those who contributing under defined contribution (DC) plan, since the contributors under this plan are allowed in managing some portion of their savings. The contributors are allowed to withdraw or invest during contribution (working) period, according to rules and regulations. Therefore, the objective of this study is to estimate the retirement wealth adequacy of future retirees under the DC plan in Malaysia using wealth-need ratio model and simulation approach. There are four simulated wealth-need ratio models projecting with several feasible scenarios, including an optimistic scenario involving more investment activities (more-investments) and a pessimistic scenario including no or less investment activities (more-savings), based on several related assumptions. The results show that 43% of households are projected ...
马来西亚人是否为未来退休的费用做好了充分的准备,这个问题在过去几年一直是重要的辩论和研究主题,特别是对于那些根据固定缴款(DC)计划缴款的人,因为该计划的缴款人被允许管理他们的部分储蓄。按照规定,供款人在供款(工作)期间可以提取或投资。因此,本研究的目的是使用财富需求比模型和模拟方法来估计马来西亚DC计划下未来退休人员的退休财富充足性。有四种模拟的财富需求比模型,预测了几种可行的情景,包括一个乐观的情景,涉及更多的投资活动(更多的投资)和一个悲观的情景,包括没有或更少的投资活动(更多的储蓄),基于几个相关的假设。结果表明,在悲观情景下,预计有43%的家庭拥有足够的退休福利,而在乐观情景下,预计有94%的家庭拥有足够的退休福利。此外,本文还构建了三个混合模型,通过开发三个不同比例的家庭投资较多和家庭储蓄较多的样本,以提供更真实的马来西亚人口情景。结果表明,投资比例较高的家庭中,80%的家庭有足够的退休福利,而储蓄比例较高的家庭中,只有65%的家庭有足够的退休福利。马来西亚人是否为未来退休的费用做好了充分的准备,这个问题在过去几年一直是重要的辩论和研究主题,特别是对于那些根据固定缴款(DC)计划缴款的人,因为该计划的缴款人被允许管理他们的部分储蓄。按照规定,供款人在供款(工作)期间可以提取或投资。因此,本研究的目的是使用财富需求比模型和模拟方法来估计马来西亚DC计划下未来退休人员的退休财富充足性。有四种模拟的财富需求比模型,预测了几种可行的情景,包括一个乐观的情景,涉及更多的投资活动(更多的投资)和一个悲观的情景,包括没有或更少的投资活动(更多的储蓄),基于几个相关的假设。结果显示,43%的家庭预计……
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引用次数: 1
The impact of capital thresholds on credit risk: Empirical evidence on Malaysian mixed banking systems 资本门槛对信贷风险的影响:马来西亚混合银行体系的实证证据
Pub Date : 2019-08-21 DOI: 10.1063/1.5121075
H. A. Wahab
After the Subprime crisis 2008, the issue of loan default has gained significant importance by regulators, bankers, academia as well as market players around the globe till today. So far, large volume of studies have been devoted in investigating several bank characteristics affecting credit risk, however lack focus has been put to specifically examine the impact of capital thresholds on credit risk level. The issue on how well capitalized banks perform in relation to non-performing loan remains unresolved especially for small developing market of Malaysia. Motivated from here, the purpose of this study is to investigate the impact of capital on non-performing loan problem under different capital thresholds from March 2010 till September 2017. Using non-dynamic panel threshold model, the study finds that capital threshold is significant in affecting the relationship between credit risk and capital level. Furthermore, there is negative relationship between capital and credit risk under large capital regime, suggesting that well-capitalized banks are having adequate resources and expertise, reflecting better risk management and improved governance in minimizing defaults.After the Subprime crisis 2008, the issue of loan default has gained significant importance by regulators, bankers, academia as well as market players around the globe till today. So far, large volume of studies have been devoted in investigating several bank characteristics affecting credit risk, however lack focus has been put to specifically examine the impact of capital thresholds on credit risk level. The issue on how well capitalized banks perform in relation to non-performing loan remains unresolved especially for small developing market of Malaysia. Motivated from here, the purpose of this study is to investigate the impact of capital on non-performing loan problem under different capital thresholds from March 2010 till September 2017. Using non-dynamic panel threshold model, the study finds that capital threshold is significant in affecting the relationship between credit risk and capital level. Furthermore, there is negative relationship between capital and credit risk under large capital regime...
自2008年次贷危机以来,贷款违约问题一直受到全球监管机构、银行家、学术界以及市场参与者的高度重视。到目前为止,大量的研究都是针对影响信用风险的银行特征进行研究,但缺乏对资本门槛对信用风险水平影响的具体研究。关于资本充足的银行在不良贷款方面的表现如何的问题仍然没有解决,特别是对于马来西亚的小发展中市场。基于此,本研究的目的是研究2010年3月至2017年9月不同资本门槛下资本对不良贷款问题的影响。采用非动态面板阈值模型,研究发现资本阈值对信用风险与资本水平的关系有显著影响。此外,在大资本制度下,资本与信贷风险之间存在负相关关系,这表明资本充足的银行拥有足够的资源和专业知识,反映出在最大限度地减少违约方面风险管理和治理得到改善。自2008年次贷危机以来,贷款违约问题一直受到全球监管机构、银行家、学术界以及市场参与者的高度重视。到目前为止,大量的研究都是针对影响信用风险的银行特征进行研究,但缺乏对资本门槛对信用风险水平影响的具体研究。关于资本充足的银行在不良贷款方面的表现如何的问题仍然没有解决,特别是对于马来西亚的小发展中市场。基于此,本研究的目的是研究2010年3月至2017年9月不同资本门槛下资本对不良贷款问题的影响。采用非动态面板阈值模型,研究发现资本阈值对信用风险与资本水平的关系有显著影响。此外,在大资本制度下,资本与信用风险之间存在负相关关系。
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引用次数: 0
Stability of individual object in construction of voting-merged approach 投票合并方法构造中单个对象的稳定性
Pub Date : 2019-08-21 DOI: 10.1063/1.5121132
Norin Rahayu Shamsuddin, N. Mahat
The construction of multiple partitions in consensus clustering with random initialization and various parameters values of clustering algorithm enable us to measure the stability of objects (points) in a cluster. The procedure to indicate stability is aided by the co-occurrences of pair objects (i,j) allocated to the same cluster in each partition. In this paper, we propose a voting-merged method - a combination of voting-based method and merging process. Our experiment with simulations and real datasets shows better performance for well-separated clusters and low degree of overlapping.The construction of multiple partitions in consensus clustering with random initialization and various parameters values of clustering algorithm enable us to measure the stability of objects (points) in a cluster. The procedure to indicate stability is aided by the co-occurrences of pair objects (i,j) allocated to the same cluster in each partition. In this paper, we propose a voting-merged method - a combination of voting-based method and merging process. Our experiment with simulations and real datasets shows better performance for well-separated clusters and low degree of overlapping.
随机初始化的共识聚类中多个分区的构造和聚类算法的不同参数值使我们能够衡量聚类中对象(点)的稳定性。表明稳定性的过程是通过在每个分区中分配给同一集群的对对象(i,j)的共现来辅助的。本文提出了一种基于投票的方法与合并过程相结合的投票合并方法。我们在模拟和真实数据集上的实验表明,分离良好的簇和低重叠程度的簇具有更好的性能。随机初始化的共识聚类中多个分区的构造和聚类算法的不同参数值使我们能够衡量聚类中对象(点)的稳定性。表明稳定性的过程是通过在每个分区中分配给同一集群的对对象(i,j)的共现来辅助的。本文提出了一种基于投票的方法与合并过程相结合的投票合并方法。我们在模拟和真实数据集上的实验表明,分离良好的簇和低重叠程度的簇具有更好的性能。
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引用次数: 0
Entrepreneurial practice amongst lecturers of vocational college 高职院校讲师创业实践
Pub Date : 2019-08-21 DOI: 10.1063/1.5121141
Hanim Zainal, M. Jabor
Vocational Colleges nowadays have activities based on entrepreneurship education. Entrepreneurship is one of the elements of teaching and learning opportunities for teachers and students in particu...
目前,高职院校开展了以创业教育为基础的活动。创业精神是教学和学习机会的要素之一,尤其是对教师和学生来说。
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引用次数: 0
Classification predictive models of running- and cycling-induced fatigue 行车疲劳与骑行疲劳分类预测模型
Pub Date : 2019-08-21 DOI: 10.1063/1.5121136
S. Tang, W. P. Loh
The lower limb muscle fatigue and changes in lower limb kinematics during running and cycling indicate early signs of fall and injury risk. Past studies had analyzed the effects of running and cycl...
在跑步和骑自行车时,下肢肌肉疲劳和下肢运动学的变化是跌倒和受伤风险的早期迹象。过去的研究分析了跑步和循环运动的影响……
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引用次数: 1
期刊
THE 4TH INNOVATION AND ANALYTICS CONFERENCE & EXHIBITION (IACE 2019)
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