• 대한산업공학회지
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• 제34권2호
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• pp.151-159
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• 2008

An efficient location registration scheme is essential to accommodate continuously increasing mobile subscribers and to offer a variety of multimedia services with good quality. In this study, we consider a distance-based registration scheme where the number of location areas varies on the basis of cell-by-cell, not of ring-by-ring, to analyze the optimal size of the location area. Using our proposed cell-by-cell distance-based registration scheme with random walk mobility model, we analyze a variety of circumstances to obtain the optimal number of cells for location area that minimizes total signaling traffic on radio channels. From our analysis results, we show that the optimal number of cells for location area is between 4 and 6 in most cases, and our cell-by-cell distance-based location registration scheme has less signaling traffic than optimal ring-by-ring distance-based location registration scheme where optimal distance threshold is 2 (thus the optimal number of cells for location area is 7).

• 한국융합학회논문지
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• 제8권12호
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• pp.343-349
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• 2017

본 연구는 산업단지 입지요인을 선행연구를 중심으로 종합적으로 검토하여 본 연구 목적에 맞게 연구모델을 개발과 관련변수를 투입하여 실증 분석을 실시하였다. 본 연구에서는 입지결정요인을 기반시설의 안정화와 산업자원의 접근도 그리고 매개변수인 주거 근린환경요인군의 세 가지 요인 군으로 대별하여 산업입지결정요인과의 관계정도를 분석하였다. 본 연구 분석을 위해 연구모형에 근거하여 설정된 가설을 통해 구조방정식 모형의 경로분석을 통해 가설을 분석하였다. 분석결과 독립변수인 기반시설요인군의 교통과 산업기반시설 요인과 자원접근 요인인 노농과 생산자원 접근성 모두 산업입지에 영향관계에 있는 것으로 분석되었다. 또한 매개변수인 근린환경요인과 산업입지결정요인간의 분석에서도 통계적으로 유의한 상관관계가 있는 것으로 분석되었다. 본 연구 결과는 지속적으로 추진되고 있는 국가 및 지방 자치단체의 산업단지 개발에 있어서 산업기반시설의 구축과 산업단지 개발 사업에 유용한 지침을 제공할 수 있을 것으로 기대된다.

• 산업기술연구
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• 제21권B호
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• pp.85-89
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• 2001

In this paper, we analyze a time-based update method in location management and calculate the optimal time-interval. The probability that an MT is j rings away from the center cell is obtained by computer programming. And using these values, an exact analysis is made for the time-based location management cost. From the result, when the time-based method is applied to location update, we can get the optimal time-interval which minimizes the location management cost.

• 산업공학
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• 제22권2호
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• pp.185-191
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• 2009

In this study, we propose an improved group location tracking scheme (GLS) called integrated GLS (IGLS) which, in addition to the group location registration of the GLS, sends an integrated group registration message to a virtual visitor location register (VVLR) instead of sending an individual group registration message. This integrated procedure of proposed scheme leads registration cost of group registration and group location registration to be reduced significantly. Numerical results demonstrate that our proposed IGLS outperforms conventional GLS and delayed GLS (dGLS). The IGLS can be applied effectively on public transportation systems such as subway, train and bus.

• 대한안전경영과학회지
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• 제13권1호
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• pp.107-114
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• 2011

Location-Based Service(LBS) is a service that provides a variety of convenience in life using location information that can be obtained by mobile communication network or satellite signal. In order to provide LBS precisely and efficiently, we need the location determination technology, platform technology and server technology. In this study, we studied on how we can reduce the error on location determination of objects such people and things. Fingerprint location determination method was applied to this study because it can be used at current wireless communication infrastructure and less influenced by a variety of noisy environment than other location determination methods. We converted the probability value to logarithmic scale value because using the sum of k probability values is not suitable to be applied to weight determination. In order to confirm the performance of suggested method, we developed location determination test program with Visual Basic 6.0 and performed the test. According to indoor and outdoor test results, the suggested stochastic method reduced the distance error by 17%, 18% and 9% respectively at indoor environment and 25%, 11% and 4% at outdoor environment compared with deterministic NN, kNN and kWNN fingerprint methods.

• 국토계획
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• 제54권7호
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• pp.58-69
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• 2019

This study suggested the necessity of introducing the future-oriented new industrial complex as a way to enhance the competitiveness of the industrial complex in response to the industrial ecosystem change caused by the 4th industrial revolution. To evaluate the location suitability for the new industrial complex, location indices were developed in this study. The flexibility of location and connectivity to neighboring areas of the future-oriented new industrial complexes were the focused subjects of this study. In-depth expert consultation and Delphi survey were conducted to construct an index system and to measure the indices. Afterwards, the AHP analysis was conducted to elucidate the weighting by indicators. As a result, the indicators of industrial innovation environment were the most important in the major category. In addition, the convenience of workers, especially urban environment, was analyzed as an important factor for success of the future-oriented new industrial complex. The indicators which are closely related to the concept and purpose of the future-oriented new industrial complex turned out to have the higher weight compared to other indicators. From the point of view of the developers of the industrial complexes or tenant companies, the implications for deriving suitable locations for development of industrial complexes among urban under-utilized sites are suggested. Furthermore, It is expected that the government will be able to apply the development system to stimulate the development of these new industrial complexes and to prepare guidelines for selecting locations.

• 대한산업공학회지
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• 제7권2호
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• pp.19-26
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• 1981

A special case of the probabilistic multi-location problem is studied in a two-echelon logistic system for deteriorating items. The objective is to determine the location of the minimum number of supply centers among a discrete set of location sites of supply centers, such that the probability each retailer being covered by some supply center is not less than a specified value. A logistic cost is introduced as performance measure of the system, and leads us to analyze the impact of deterioration rate on the location problem. The results obtained from numerical examples are discussed, which provides effective guidelines that can be used for the logistic managerial decisions.

• 지역연구
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• 제10권1호
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• pp.19-37
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• 1994

The past studies on the change of industrial location can be reinterpreted as spatial determinism, decision making process determinism and industrial sturcure determinism according to the view of the mutual operation between the economic activity and spatial structure. From the point of the industrial structure determinism which focuses on the fact that the locational type of production activity can be differenciated by the structural change of industry itself, it is proper to explain the change of industrial location not only by spatial condition but also by containing the fundamental changing causes for the reorganization of the spatial condition. One of the most important changing causes for reorganizing economic space is industrial technology. This study aims to explain the spatialization process of industrial technology and consists of the process of suggesting the hypothesis that the spatialization process is differentiated according to the production organization as the user of industrial technology and the user of industrial technology and the production system as using method. In other words, this study attempts to internalize the technology variable, which has been treated as external in the past studies on the industrial location, as an independent one and consider the production organization and production system as a paramenter, so that it can represent 'conceptual framework' for explaining the change of industrial location.

• 한국산학기술학회논문지
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• 제15권7호
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• pp.4562-4572
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• 2014

최근 스마트폰의 위치 기반 서비스는 급속도로 성장하는 모바일 기술 중 하나이다. 본 논문에서는 모바일에서 위치 기반 서비스를 사용할 때 특정한 위치에 따라 위치 기반 서비스의 주기를 변경시키기 위한 기법을 제안한다. 이를 통해 위치 기반 서비스의 주기를 위치에 따라 커스터마이제이션 할 수 있으며, 결과적으로 일정한 주기로 위치 기반 서비스를 이용할 때보다 모바일 자원의 낭비를 줄일 수 있는 프로세스를 제안한다.

• 산업경영시스템학회지
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• 제8권12호
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• pp.1-6
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• 1985

The purpose of this study is to consider the criteria for decision-making of facility location in view of Minimax. As an illustration of the location of storerooms in a manufacturing plant that minimizes the maximum distance workers must travel to reach a storeroom, the number and variety of location problems that can be formulated appropriately as minimax problems are sizable. A minimax solution can be interpreted as a grease the squeaky wheel solution In solving a minimax location problem, costs other than the maximum cost are not considered.