• 산업경영시스템학회지
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• 제24권66호
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• pp.37-45
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• 2001

Because the structure of the economy is being changed from product-oriented and company-centered economy to service-oriented and customer-centered economy, and the market competition is varying with the competition of non-price factors, the importance for customer service of logistics system is being increased. Thus, the level of customer service should be represented as an element of the logistics decision and the facility location decision. The level of customer service provided by logistics system has an effect on customers\` purchase decisions, hence on the market demand. That is, the market demand is elastic for customer service as it is influenced by product price. Considering the effect of customer service on demand, this study develops the market area which each facility will serve. That area is circular, and distance norm is considered Euclidean and Rectilinear (or Manhattan) distance norm. The market demand for product at a particular area is affected by the level of customer service that facility provides, and the relationship between the market demand and the level of customer service is represented with a mathematical function.

• 한국HCI학회:학술대회논문집
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• 한국HCI학회 2008년도 학술대회 1부
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• pp.674-678
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• 2008

본 논문은 WBAN(Wireless Body Area Network) 환경에 기반한 스마트 오브젝트(Smart Object)의 개발에 대한 논문이다. 다양한 기능을 가진 컴퓨팅 디바이스를 장착한 스마트 오브젝트가 많이 개발되면서, 사용자에게 가중되는 소지품으로써의 수많은 기기, 도구들을 사용자가 하나하나 관리하기에는 역부족이므로, 이를 분류하고 관리함으로써 사용자는 단순히 자신들이 가진 스마트 오브젝트의 기능만을 활용하게 해주는 스마트 오브젝트의 개인 네트워크 화하는 기기의 필요성이 증대된 가운데, 이러한 형태의 오브젝트를 개발함에 있어 어떠한 기술들이 필요하고 어떠한 요소들을 갖춰 설계 해 나가야 할지에 대한 최적화된 설계 기준을 분석하고 개발 방향을 제시하고자 한다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2002년도 Proceedings of International Symposium on Remote Sensing
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• pp.308-311
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• 2002

Radar interferometric phase is sensitive to both ground topography and coherent surface displacement. The basic tactics of differential interferometric synthetic aperture radar (DInSAR) technique are to separate the two effects. Applications of DInSAR to Duk-Po area in Busan were studied. In the study area, an abrupt subsidence, possibly caused by sub-way construction, was observed by JERS-1 SAR interferometry. Differential interferograms were generated using twenty-three JERS-1 SAR data acquired between April 24, 1992, and August 7, 1998. Because the area is relatively flat with little topographic relief the topographic effects were not removed. A phase filtering and interferogram techniques were applied to increase fringe clarity as well as to decrease decorrelation error. The stacking improves the quality of interferograms especially when the displacement is discontinuous. The interferograms clearly show the evidence of subsidence along Duk-Po subway railroad. These results demonstrate that the interferogram stacking technique can improve the detectability of radar interferometry to an abrupt displacement and DInSAR is useful to geological engineering applications.

• Journal of Electrical Engineering and Technology
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• 제4권4호
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• pp.451-456
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• 2009

Through the development of phasor measurement units (PMU), various aspects of power system dynamic behavior could be monitored and diagnosed. Monitoring dynamic voltage stability has become one of the achievements we can obtain from PMUs. It is very important to select the most appropriate method for the Korea Electric Power Corporation (KEPCO) system since there are many voltage stability indices. In this paper, we propose an advanced WAVI (Wide Area Voltage Stability) that is well suited for the purposes of monitoring the dynamic voltage stability of KEPCO's PMU installation plan. The salient features of the proposed index are: i) it uses only PMU measurements without coupling with EMS data; ii) it is computationally unburdened and can be applied to real-time situations. The proposed index is applied to the KEPCO test system and the results show that it successfully predicts voltage instability through comparative studies.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2004년도 춘계학술대회 논문집
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• pp.522-527
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• 2004

Nowadays, becoming wide area is going on over Seoul Metropolitan area. But urban railway, very important traffic facilities, is operated in normal operating position and it gives cause to week the function of commuting long distance. This paper is focus on studying the feasibility of rapid operation system in Seoul Metropolitan area through comparing the present state of urban railway in Seoul Metropolitan area with a case of the advanced facilities in developed country. And we develop rapid operation system in general aspect through only consideration of operation planning without improvement of facilities. Also, we come up with new concept of rapid operation system through investigation of limits of the preceding researches

• International Journal of Oral Biology
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• 제34권3호
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• pp.123-129
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• 2009

Taste is associated with hedonic evaluation as well as recognition of quality and intensity. Taste information is sent to the cortical gustatory area in a chemotopical manner to be processed for discrimination of taste quality. It is also conveyed to the reward system and feeding center via the prefrontal cortices. The amygdala, which receives taste inputs, also influences reward and feeding. In terms of neuroactive substances, palatability is closely related to benzodiazepine derivatives and $\beta$-endorphin, both of which facilitate consumption of food and fluid. The reward system contains the ventral tegmental area, nucleus accumbens and ventral pallidum and finally sends information to the lateral hypothalamic area, the feeding center. The dopaminergic system originating from the ventral tegmental area mediates the motivation to consume palatable food. The actual ingestive behavior is promoted by the orexigenic neuropeptides from the hypothalamus. Even palatable food can become aversive and avoided as a consequence of postingestional unpleasant experience such as malaise. The brain mechanism of these aspects of taste is elucidated.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1987년도 정기총회 및 창립40주년기념 학술대회 학회본부
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• pp.154-156
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• 1987

An important aspects of power system design involves consideration of service reliability requirements of load to be supplied and service reliability provided by any proposed system. This paper shows the investigation of the 1984 KEPCO service reliability to the large electric consumer whose contracted maximum demand is over 500 kw. 68 customers of the total 111 investigated are located in Myungdong area and Yuido in Seoul. Of the customers are included hotel Lotte, Giobo and Seoul national University Hospital. The average service reliability of Myungdong area customers is 316min/yr/customer and about 7 times/yr/customer, and 160 min, 6 times for Yuido. Which the service reliability the interruption and the interruption frequency which caused by the customers receiving facilities were showed. The investigation is telling that the service reliability of the underground distribution area are very superior to the other area reliability. The investigated reliability seem not appropriate to be improved by change of distribution System as well as equipments and facilities improvement in the near future.

• 한국조경학회지
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• 제18권3호통권39호
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• pp.85-97
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• 1990

To understand the parks and leisure recreation environments of United States, some major areas are studied with the brief history of R & P area. development Those are 1) National Park System and National Park Service 2) ORRRC and BOR 3) Education of the Recreation & Park professions. Some findings of this study can be summarized as follows : 1. In United States, R & P area has been developed on the firm base of 'Publicity'. Central Park as a public park, National Park Service and Bureau of Outdoor Recreation as Federal organization have led this concept. 2. Major recreational resources - natural, cultural and historical etc-have converged into National Park System. On that, conservation and recreation use of those resources are possible in balance. 3. Establishment of the R & P area in the early stage made a great contribution to educate professionals. And this situation has been so helpful for balanced development of the area.

• Journal of Chest Surgery
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• 제47권3호
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• pp.201-210
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• 2014

During the last decade the role of minimally invasive surgery has been increased, especially with the introduction of the robotic system in the surgical field. The most important advantages of robotic system are represented by the wristed instrumentation and the depth perception, which can overcome the limitation of traditional thoracoscopy. However, some data still exist in literature with regard to robotic lobectomy. The majority of papers are focused on its safety and feasibility, but further studies with long follow-ups are necessary in order to assess the oncologic outcomes. We reviewed the literature on robotic lobectomy, with the main aim to better define the role of robotic system in the clinical practice.

• 한국지리정보학회지
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• 제26권3호
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• pp.65-84
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• 2023

지자체 차원의 균형발전 계획을 수립하기 위해서는 현 상태의 도시공간구조를 파악해야 한다. 특히 중심지는 균형발전의 핵심 요소이므로 그 위치와 규모를 정확히 판단하는 것이 필요하다. 따라서 본 연구는 부산시를 대상으로 중심지 체계를 식별하고 중심지의 기능을 누릴 수 있는 중심지의 영향권에서 소외되는 지역을 도출하고자 하였다. 중심지 체계 식별을 위해 부산시 전역에 대해 4개 지표(지가, 생활인구, 카드 소비, 상업 용도 건축물)를 활용하여 중심지 면적 지수를 산출하고 Getis-Ord Gi*와 DBSCAN 분석을 수행하였다. 식별된 중심지에 대해서는 위계를 구분하고 위계별 네트워크 분석을 통해 영향권을 도출하였다. 분석 결과 중심지는 서면, 중앙, 연산, 장산, 해운대, 덕천, 동래, 대연, 사상, 부산대, 부산역, 사직 총 12곳으로 나타났다. 중심지 영향권 소외지역은 대부분 동부산권역과 서부산권역에서 나타났으며 노후 공업지역과 주거지역, 신도시 일부에서도 도출되었다. 본 연구는 기존 연구에서 다루지 않았던 머신러닝 방법론을 적용하여 기존 계획상 중심지와 실제 데이터 간 차이를 밝히고 중심지 위치와 소외지역을 식별하였다는 점에서 의의가 있다.