• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권6호
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• pp.2811-2830
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• 2017

In this paper, we study the problem of mobile data offloading for a network that contains multiple mobile network operators (MNOs), multiple WiFi or femtocell access points (APs) and multiple mobile users (MUs). MNOs offload their subscribed MUs' data traffic by leasing the unused Internet connection bandwidth of third party APs. We propose a combinatorial auction-based two-stage matching mechanism comprised of MU-AP matching and AP-MNO matching. The MU-AP matching is designed to match the MUs to APs in order to maximize the total offloading data traffic and achieve better MU satisfaction. Conversely, for AP-MNO matching, MNOs compete for APs' service using the Nash bargaining solution (NBS) and the Vickrey auction theories and, in turn, APs will receive monetary compensation. We demonstrated that the proposed mechanism converges to a distributed stable matching result. Numerical results demonstrate that the proposed algorithm well capture the tradeoff among the total data traffic, social welfare and the QoS of MUs compared to other schemes. Moreover, the proposed mechanism can considerably offload the total data traffic and improve the network social welfare with less computation complexity and communication overhead.

• 농촌계획
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• 제20권1호
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• pp.127-134
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• 2014

This study, in order to complement instability of analysis result stemming from the choice between reference point and comparison point which is pointed out as the defect of shift-share analysis, conducted shift-share analysis using Gross Regional Domestic Product (GRDP) trend of Geumgang area, Chungcheongnam-do for the period from 2000 to 2011. As a result of the analysis, (1) industries that had both the positive Regional Share Effect (RSE) and Industrial Mixed Effect (IME) were service industries such as manufacturing industry, electricity gas, transportation industry, art, etc., which are positively influencing the regional industry. (2) industries that had both the negative RSE and IME were other service industries such as wholesale and retail businesses, lodging industry, food industry, real estate business and leasing service, business service industry, public administration, etc., which provide basic livelihood services for the residents. (3) industries that had the positive RSE and negative IME were agriculture, forestry and fishery industry, mining industry, construction industry, and educational service industry. (4) industries that had the negative RSE and positive IME were info-communications industry, financial and insurance businesses, health industry, etc.

• 한국실내디자인학회논문집
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• 제27권1호
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• pp.3-11
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• 2018

The number of shared offices has increased and changed within the flow of the era into various forms in recent days. Co-working spaces and related shared space businesses are growing fast, keeping pace with the trend recently. It is confirmed that the need of spaces grew 180% since 2015 to 2017. Most of the shared offices in Seoul are placed in Gangnam circle, it is verified that shared office is providing work, space, and community by visiting cases of foreign companies, domestic companies, local companies. Meanwhile, shared space can be categorized into serviced office, co-working space, virtual office, and daily office. It is to consider various target levels by leasing service or the difference of costs. It is divided into forms of dispersion, circulation, and concentration and is planned to increase the utilization of communities' traffic according to the allocation of shared office. The business is conducted network-centered. During the process of communication, members can get chances to exchange and build communities. They are making business ecosystem which they can coexist and grow together. Shared offices have a view of a solution to empty rooms and will last for a while, and it is expected that co-working system be settled as office space and giving people sense of belonging on their workspace.

• 농촌계획
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• 제19권3호
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• pp.169-182
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• 2013

The purpose of this study is derived by Utilization Strategy for Rural empty houses stability of Return to the Farm and Rural. The main findings can be summarized as follows. First, the recent return to the farm and rural has increased, and life patterns of diversification, and the retirement of the baby boomer generation return to the farm and rural ratio differed by region. Second, the required first order accurate and detailed to maximize the utilization of the rural empty houses Survey, and the integrated management system based on it should be built. Third, the public lead in pushing for policy to take advantage of an empty house, leasing and management capabilities by strengthening return to the farm and rural characters, revitalizing rural and residential stabilization is necessary. Finally, in order to enhance the utilization of the rural empty houses should prepare return to the farm and rural, Multi-Habitation and a common space for existing residents for a variety of purposes. The results of these studies has a significance that can promote rural housing return to the farm and rural, resource utilization and stable settlement, and rural areas activated at the same time. Utilization of specific rural empty houses feasible policy being prepared, by linking rural areas that can bring effects on the activation of alternative hope.

• 대한산업공학회지
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• 제37권4호
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• pp.289-296
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• 2011

In most distribution centers, products are received from the suppliers in units of pallet, stored in a rack, moved to the picking area for replenishment, picked according to customer orders, and shipped to customers. In some distribution centers, however, replenishment is made in not a whole pallet but only a portion of a pallet load, mainly due to the limited space in the order-picking area; as a result, partially loaded pallets occupy cells in the rack. As the number of slow-moving items increases, more cells are occupied by partially loaded pallets so that fewer empty cells are available for storing full, incoming pallets. This will necessitate the construction or leasing of additional storage space, which will entail significant cost. As an alternative, we propose pallet consolidation, which involves moving a partial load to another partially-loaded pallet in order to create one empty cell in the rack. In this paper, we define three pallet consolidation problems; formulate each problem as a binary integer programming model; and present heuristic algorithms for the problems. The average performance of each of the proposed heuristics is evaluated using simulation.

• The Journal of Asian Finance, Economics and Business
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• 제4권3호
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• pp.57-73
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• 2017

In the current competitive marketplace of real estate business, tenant satisfaction measurement is one of the important indicators to monitor competitiveness in industrial property development. It has become an industry standard to measure tenant satisfaction, commonly called customer satisfaction. Customer satisfaction has become the widely used metric to manage customer loyalty (Keiningham, Gupta, Aksoy, & Buoye, 2014). The aim of this research is to determine the impact of property management services on tenants' satisfaction with the three identified variables i.e. facility management, perceived quality and lease management. Structural equation modeling (SEM) is applied to build constructs and test the hypotheses with the collected survey samples. Of the three variables, facility management is the most influential factor that leads to tenant satisfaction with industrial buildings. Next, perceived quality is another important factor that contributes to tenants' pleasure. Compared with these two, lease management fares worse, having the least extensive effect on tenant satisfaction, and could be disregarded. The ultimate impact of tenant satisfaction is about tenant retention and recommendation. The overall findings of this research will potentially help real estate developers to develop a better property management system, leasing program and tenant retention strategy.

• 한국의류학회지
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• 제41권3호
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• pp.548-555
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• 2017

This study focuses on how clothing can increase in the age of the shared economy and as an alternative to the capitalist economy of the 21st century. This study investigates how infants and children use clothes as they undergo many changes based on physical growth, identifies use and disposal methods for surplus clothing from the perspective of a shared economy and explores plans to foster an environment for the healthy use of clothes. The objectives of this study are as follows. First, identify the need for new clothes based on physical changes in the human body; second, propose an alternative to permanent disposal by making used clothes appropriate for temporary disposal (renting and leasing). In sharing services, the condition and quality of the product were found to be the most important factors. The condition and quality of the product (70.0%) were the most important factors in sharing services. The sharing services for clothes and goods of infants and children could become popular quickly if there was a reliability guarantee offered by such sharing services. In addition, providing trial services and aggressive publicity for sharing services is urgent for the expansion of opportunities for general consumers.

• 산업경영시스템학회지
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• 제29권1호
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• pp.101-108
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• 2006

The issue of using information system to ensure competitive power in the market is rising. The outsourcing methods that entrust activities of information system of companies to other expert agencies are increasing as the enterprises make a lot of efforts to put their resources to their heart of business in the process of adopting information system. Recently, ASP(Application Service Provider) as a new information technology outsourcing method appears due to the development of network technology and spreading of peculating software. ASP defines as a software leasing service which is supplied through networks instead of purchasing application software with high price. For successful implementation of ASP, it is necessary to develop a certification program to ensure safety and reliability of ASP. This paper provides the safe and reliable certification program for ASP. In order to develop it, the critical issues related to service quality and certification of ASP are identified and then evaluation methodology for the ASP certification program is proposed. This paper presents service provider(service environment) certification as the part of the ASP certification program.

• 경영과학
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• 제24권2호
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• pp.127-142
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• 2007

This study deals with the optimal design of mobile access network connecting base stations(BSs) and mobile switching centers(MSCs). Generally mobile operators constitute their access networks by leasing communication lines. Using the characteristic of leased line rate based on administration region, we build an optimization model for mobile access network design which has much smaller number of variables than the existing researches. And we develop a GUI based optimization tool integrating the well-known softwares such as MS EXCEL. MS VisualBasic, MS PowerPoint and Ip_solve, a freeware optimization software. Employing the current access network configuration of a Korean mobile carrier, this study using the optimization tool obtain an optimal solution for both single MSC access network and nation-wide access network. Each optimal access network achieves 7.45% and 9.49% save of lease rate, respectively. Considering the monthly charge and total amount of lease line rate, our optimization tool provides big amount of save in network operation cost. Besides the graphical representation of access networks makes the operator easily understand and compare current and optimal access networks.

• 정보처리학회논문지D
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• 제8D권3호
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• pp.211-220
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• 2001

인터넷 마켓플레이스에서는 상용자를 도와주는 계획 에이전트가 가장 중요한 역할을 수행한다. 최근에 인터넷과 분산처리 기법들의 기술 발전으로 많은 인터넷 마켓플레이스들이 구축되고 있으나 이들 중에서 계획 에이전트에 대한 구체적인 구현 시스템은 아직 없다. 본 논문에서는 인터넷 마켓플레이스를 위하여 XML을 기반으로 한 계획 에이전트를 설계하고 구현한다. 이를 위해 관련 분야인 다중데이타베이스 시스템과 워크플로우 관리시스템의 특징을 비교 분석하고, 계획 에이전트의 기능과 역할을 기술한다. 설계된 계획 에이전트 시스템은 COM+, ASP, XML을 사용하여 구현하며 실제 운영되고 있는 데이터를 얻어 실험을 수행한다.