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Research on the Determinants of Government Investment Effect 政府投资效应的决定因素研究
Pub Date : 2020-10-01 DOI: 10.21078/JSSI-2020-387-14
Xuelian Yang, Yu Zhang, Cuihong Yang, Jian Xu
Abstract Government investment plays an important role in promoting and guiding the economic and social development in China. Xinjiang is the core province of the Belt and Road and its economic growth is mainly driven by investment. This paper decomposes the determinants of government investment effect into economic structure change, technological change and investment structure change, using the non-competitive input-output table of Xinjiang province in 2007, 2012 and 2015 and structural decomposition analyses. The results show that, the government investment effect in Xinjiang shows a slight decline trend. During the period, the change of economic structure and investment structure have the negative impact on government investment effect, while the change of technology has the positive impact on government investment effect. In addition, these impacts have strong sectoral heterogeneity.
政府投资在促进和引导中国经济社会发展方面发挥着重要作用。新疆是“一带一路”建设的核心省份,经济增长主要依靠投资拉动。本文利用新疆省2007年、2012年和2015年的非竞争性投入产出表并进行结构分解分析,将政府投资效果的决定因素分解为经济结构变化、技术变化和投资结构变化。结果表明,新疆政府投资效应呈小幅下降趋势。在此期间,经济结构和投资结构的变化对政府投资效果产生了负面影响,而技术的变化对政府投资效果产生了积极影响。此外,这些影响具有很强的部门异质性。
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引用次数: 1
Relationships Among Perceived Value, Satisfaction, and e-Trust: An e-CRM View of Online Restaurant Consumption 感知价值、满意度和电子信任之间的关系:网上餐饮消费的电子crm视角
Pub Date : 2020-10-01 DOI: 10.21078/JSSI-2020-458-18
Gang Zhang, Zongshui Wang, Hong Zhao
Abstract This paper aims to propose a new trend in research which integrates the online customer relationship management through the perspectives of perceived value, satisfaction, and e-trust regarding the online restaurant in Chinese e-CRM business backgrounds. This study constructs a structural equation model to analyze the online restaurant marketing with the research perspective of the relationships among perceived value, satisfaction and e-Trust, corresponding to the cognitive belief, affective experiences and cognitive behavior of e-CRM. This model proposes six hypotheses concerning the relationships among perceived value, satisfaction and e-trust, aiming to demonstrate the predominant factors affecting the online restaurant sales and further to have a better understanding of the customers’ preferences on placing orders and purchases in the online context. The results show that there is a series of connections among perceived value, satisfaction and e-trust, and most of them are important. First, the perceived value has an incentive effect on satisfaction, e-trust, and customers’ commitment to a relationship. Second, satisfaction has a positive impact on e-trust and leads to the commitment to a relationship. Third, e-trust positively affects the consumer commitment to a relationship. In addition, production quality, service quality and price fairness have a significant impact on the perceived value.
摘要本文旨在从感知价值、满意度和电子信任的角度,提出在中国电子crm业务背景下,整合在线餐厅客户关系管理的研究新趋势。本研究以感知价值、满意度和e-Trust三者之间关系的研究视角,构建结构方程模型来分析网络餐厅营销,对应e-CRM的认知信念、情感体验和认知行为。该模型提出了感知价值、满意度和电子信任之间关系的六个假设,旨在揭示影响网上餐厅销售的主要因素,并进一步了解顾客在网上下单和购买的偏好。结果表明,感知价值、满意度和电子信任之间存在着一系列的联系,其中大部分都是重要的联系。首先,感知价值对满意度、电子信任和客户对关系的承诺有激励作用。其次,满意度对电子信任有正向影响,并导致对关系的承诺。第三,电子信任正向影响消费者对关系的承诺。此外,生产质量、服务质量和价格公平对感知价值有显著影响。
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引用次数: 3
Bifractional Black-Scholes Model for Pricing European Options and Compound Options 欧式期权和复合期权定价的双分数Black-Scholes模型
Pub Date : 2020-08-26 DOI: 10.21078/JSSI-2020-346-10
Xu Feng
Recent empirical studies show that an underlying asset price process may have the property of long memory. In this paper, it is introduced the bifractional Brownian motion to capture the underlying asset of European options. Moreover, a bifractional Black-Scholes partial differential equation formulation for valuing European options based on Delta hedging strategy is proposed. Using the final condition and the method of variable substitution, the pricing formulas for the European options are derived. Furthermore, applying to risk-neutral principle, we obtain the pricing formulas for the compound options. Finally, the numerical experiments show that the parameter HK has a significant impact on the option value.
最近的实证研究表明,标的资产价格过程可能具有长记忆性。本文引入双分数布朗运动来捕获欧式期权的标的资产。在此基础上,提出了基于Delta对冲策略的欧式期权估值的双分数阶Black-Scholes偏微分方程公式。利用最终条件和变量代换的方法,推导了欧式期权的定价公式。在此基础上,应用风险中性原则,得到了复合期权的定价公式。最后,数值实验表明HK参数对期权值有显著影响。
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引用次数: 1
Traveler’s Willingness to Accept and Provide Carpooling Services: A Case Study in Beijing 乘客接受和提供拼车服务的意愿:以北京为例
Pub Date : 2020-08-01 DOI: 10.21078/JSSI-2020-356-11
Lingling Xiao, Zhitian Zhou
Abstract Carpooling as a transportation demand management (TDM) tool is currently being prevalent in major Chinese cities and producing much diminishment in the frequency of solo-driving trips. Meanwhile, much disputes relating to carpooling is arising. To better understand the acceptance and the influence factors of carpooling, this paper investigates travelers’ willingness to provide and accept carpooling services. Firstly, a questionnaire survey was conducted. Secondly, we proposed a theoretical model, both car-owners and non-car-owners were sampled as respondents, and a multi-variable regression method was employed to analyze the survey data. Finally, we found that the higher acceptance, the more positive reactions to carpooling. The results indicate that it is necessary to improve the public’s acceptance of carpooling, because lower acceptance will lead to more negative reactions towards the carpooling, which may weaken its effectiveness.
拼车作为一种交通需求管理(TDM)工具目前在中国主要城市普遍存在,并大大减少了独自驾驶出行的频率。与此同时,许多与拼车有关的纠纷正在产生。为了更好地了解拼车的接受度及其影响因素,本文调查了出行者提供和接受拼车服务的意愿。首先进行问卷调查。其次,建立理论模型,选取有车和无车人群作为调查对象,采用多变量回归方法对调查数据进行分析。最后,我们发现,接受度越高,对拼车的反应就越积极。结果表明,有必要提高公众对拼车的接受度,因为接受度越低,对拼车的负面反应越多,这可能会削弱拼车的有效性。
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引用次数: 0
Evaluation of Heavy Commercial Vehicles Brand Considering Multi-Attribute Indexes in China 基于多属性指标的中国重型商用车品牌评价
Pub Date : 2020-08-01 DOI: 10.21078/JSSI-2020-291-18
Xiaoqin Xiong, A. Cheng
Abstract Assessment of brand competitiveness which influences consumer trends and company’s sales performance contributes to business development. This paper elaborates the theories and the main investigations of brand competitiveness, and formulates a comprehensive hierarchical structure integrating multi-attribute indexes, i.e., social, technical, managerial, environmental and cultural criteria. An integrated multi-criterion decision-making (MCDM) model combining with analytic hierarchy process (AHP), grey relational analysis (GRA) and VIKOR is presented to determine the weights of influence criteria and to evaluate brand competitiveness. The utilized integrated methodology has been proved to be valid and practical by the empirical application on three enterprises. The results provide an accurate and effective tool for MCDM problem and also a new guideline for the enterprise development.
品牌竞争力的评估影响着消费者的消费趋势和企业的销售业绩,有助于企业的发展。本文阐述了品牌竞争力的理论和主要研究,并构建了一个综合社会、技术、管理、环境和文化等多属性指标的层次结构。提出了一种结合层次分析法(AHP)、灰色关联分析法(GRA)和VIKOR法的综合多准则决策(MCDM)模型,确定影响准则的权重,对品牌竞争力进行评价。通过对三家企业的实证应用,证明了所采用的综合方法的有效性和实用性。研究结果为解决MCDM问题提供了准确有效的工具,也为企业发展提供了新的指导。
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引用次数: 2
Exploring Evolution of Public Opinions on Tianya Club Using Dynamic Topic Models 基于动态话题模型的天涯社舆情演变研究
Pub Date : 2020-08-01 DOI: 10.21078/JSSI-2020-309-16
Zhihua Yan, Xijin J. Tang
Abstract Online media have brought tremendous changes to civic life, public opinions, and government administration. Compared with traditional media, online media not only allow individuals to browse news and express their views more freely, but also accelerate the transmission of opinions and expand influence. As public opinions may arouse societal unrest, it is worth detecting the primary topics and uncovering the evolution trends of public opinions for societal administration. Various algorithms are developed to deal with the huge volume of unstructured online media data. In this study, dynamic topic model is employed to explore topic content evolution and prevalence evolution using the original posts published from 2013 to 2017 on the Tianya Zatan Board of Tianya Club, which is one of the most popular BBS in China. Based on semantic similarities, topics are grouped into three themes: Family life, societal affairs, and government administration. The evolution of topic prevalence and content are affected by emergent incidents. Topics on family life become popular, while themes “societal affairs” and “government administration” with bigger standard deviations are more likely to be influenced by emergent hot events. Content evolution represented by monthly pairwise distance matrix is very easy to find change points of topic content.
网络媒体给公民生活、舆论和政府管理带来了巨大的变化。与传统媒体相比,网络媒体不仅可以让个人更自由地浏览新闻和表达观点,而且可以加速观点的传播,扩大影响力。由于民意可能引发社会动荡,因此发现民意的主要议题,揭示民意的演变趋势,对于社会管理是有价值的。为了处理大量的非结构化在线媒体数据,开发了各种算法。本研究采用动态话题模型,以中国最受欢迎的论坛之一天涯俱乐部天涯谈板2013 - 2017年发布的原创帖子为样本,探讨话题内容演变和流行度演变。根据语义相似性,主题分为三个主题:家庭生活、社会事务和政府管理。突发事件影响着话题流行度和内容的演变。家庭生活类话题更受欢迎,而标准差较大的“社会事务”和“政府管理”类话题更容易受到突发热点事件的影响。用月对距离矩阵表示的内容演化很容易找到话题内容的变化点。
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引用次数: 1
Localized or Regional? Urban Housing Policy Spillover in China’s Urban Agglomerations 2010–2018 本地化还是区域性?2010-2018年中国城市群住房政策溢出效应研究
Pub Date : 2020-08-01 DOI: 10.21078/JSSI-2020-325-21
Xiangfei Li, Hongli Han, Minghan Sun
Abstract Spatio-temporal model and event analysis were integrated in this paper, with 156 prefecture level cities’ housing transaction data and 167 items policies proposed by 10 central cities between January, 2010 and December, 2018 as samples. This paper studied the regional and cross-regional spillover effects of central cities’ urban housing regulation policies to the peripheral cities in the scope of urban agglomerations, as well as the policy-driven interactions of different regional real estate markets. The results indicated that: China’s regional housing market has obvious characteristics of policy orientation, of which the regulation measures on some central cities can affect the residential market and produce certain spillover interference on the market fluctuations of peripheral cities in time and space dimension. When geographical factor was considered, the 10 central cities had different degree of policy spillover effects caused by distinct policy types in their respective urban agglomerations. When ignoring spatial factors, restrictive policies in Beijing, Shanghai, Zhengzhou, Xi’an, Wuhan and Shenzhen had significant cross-regional spillover effects and drove the surrounding housing markets to have geared interactions, which to a certain extent revealed the flowing way of population and wealth in China’s regional economy during the past dozen years.
本文以2010年1月至2018年12月156个地级市住房交易数据和10个中心城市167项政策为样本,将时空模型与事件分析相结合。本文研究了城市群范围内中心城市城市住房调控政策对周边城市的区域和跨区域溢出效应,以及不同区域房地产市场的政策驱动互动。研究结果表明:中国区域住房市场具有明显的政策导向特征,其中部分中心城市的调控措施在时间和空间维度上对住宅市场产生影响,对外围城市的市场波动产生一定的外溢干扰。在考虑地理因素的情况下,10个中心城市在各自的城市群中由于不同的政策类型而产生了不同程度的政策溢出效应。在不考虑空间因素的情况下,北京、上海、郑州、西安、武汉、深圳等城市的限购政策具有显著的跨区域溢出效应,并带动周边房地产市场的联动互动,这在一定程度上揭示了过去十几年中国区域经济中人口和财富的流动方式。
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引用次数: 1
Recursive Solution of Queue Length Distribution for Geo/G/1 Queue with Delayed Min(N, D)-Policy 具有延迟最小(N, D)-策略的Geo/G/1队列长度分布的递推解
Pub Date : 2020-08-01 DOI: 10.21078/JSSI-2020-367-20
Yingyuan Wei, Yinghui Tang, Miaomiao Yu
Abstract In this paper we consider a discrete-time Geo/G/1 queue with delayed Min(N, D)-policy. Using renewal process theory, total probability decomposition technique and z-transform, we study the transient and equilibrium properties of the queue length from an arbitrary initial state, and obtain both the recursive expressions of the transient state queue length distribution and the steady state queue length distribution at arbitrary time epoch n+. Furthermore, we derive the important relations between equilibrium queue length distributions at different time epochs n–, n and n+. Finally, we give some numerical examples about capacity decision in queueing systems to demonstrate the application of the analytical results reported in this paper.
摘要考虑一类具有延迟Min(N, D)策略的离散时间Geo/G/1队列。利用更新过程理论、全概率分解技术和z变换,从任意初始状态出发,研究了队列长度的暂态和平衡性质,得到了任意时刻n+的暂态队列长度分布和稳态队列长度分布的递推表达式。此外,我们还推导出了n -、n和n+不同时间点的平衡队列长度分布之间的重要关系。最后,给出了排队系统容量决策的数值例子,以说明本文分析结果的应用。
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引用次数: 2
Truck and Trailer Routing Problem Solving by a Backtracking Search Algorithm 用回溯搜索算法求解卡车和拖车路线问题
Pub Date : 2020-07-28 DOI: 10.21078/JSSI-2020-253-20
Yu Shiyi, Fu Jianwen, Cui Feng, Zhang Xin
Truck and trailer routing problem (TTRP) is one of the most frequently encountered problem in city distribution, particularly in populated and intensive downtown. This paper addresses this problem and designs a novel backtracking search algorithm (BSA) based meta-heuristics to solve it. The initial population is created by T-sweep heuristic and then based on the framework of backtracking search algorithm, four types of route improvement strategies are used as building blocks to improve the solutions of BSA in the process of mutation and crossover. The computational experiments and results indicate that the proposed BSA algorithm can provide an effective approach to generate high-quality solutions within the satisfactory computational time.
卡车和拖车路线问题是城市配送中最常见的问题之一,特别是在人口密集的市中心。本文针对这一问题,设计了一种基于元启发式的回溯搜索算法(BSA)。采用T-sweep启发式算法创建初始种群,然后基于回溯搜索算法框架,采用四种路径改进策略作为构建块,对突变和交叉过程中的BSA解进行改进。计算实验和结果表明,该算法能够在满意的计算时间内生成高质量的解。
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引用次数: 4
Strategic Behavior and Optimization in an Unobservable Constant Retrial Queue with Balking and Set-Up Time 具有延迟和设置时间的不可观测恒重审队列的策略行为与优化
Pub Date : 2020-06-01 DOI: 10.21078/JSSI-2020-273-18
Linlin Wang, Liwei Liu, Zhen Wang, X. Chai
Abstract An M/M/1 constant retrial queue with balking customers and set-up time is considered. Once the system becomes empty, the server will be turned down to reduce operating costs, and it will be activated only when there is a customers arrives. In this paper, the almost unobservable case is studied, in which the information of the queue length is unavailable, whereas the state of the server can be obtained. Firstly, the steady state solutions are derived and the individual equilibrium strategies are analyzed. In addition, social optimization problems, including cost analysis and social welfare maximization are investigated by using the PSO algorithm. Finally, by appropriate numerical examples, the sensitivity of some main system parameters is shown.
摘要考虑了一个M/M/1常数重审队列,该队列中存在排队顾客和排队时间。一旦系统变为空,服务器将被关闭以降低运营成本,并且仅在有客户到达时才会激活。本文研究了几乎不可观测的情况,即队列长度信息不可用,而服务器的状态信息可以得到。首先,导出了系统的稳态解,并分析了个体均衡策略。此外,利用粒子群算法研究了成本分析和社会福利最大化等社会优化问题。最后,通过适当的数值算例,给出了系统主要参数的灵敏度。
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引用次数: 2
期刊
Journal of Systems Science and Information
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