• 무역상무연구
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• 제64권
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• pp.187-210
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• 2014

As port functions change to act as an economic catalyst and take on a central position in industries engaged in international trade, port hinterland has become a significant component in international shipping. The success of port hinterland as a strategic base of logistic activities critically depends on location selection factor for international distribution center that links elements of global supply chain management. By examining multi-measurement items empirically, this paper analyzed location selection factor for international logistics distribution center in port hinterland, and evaluated Busan new port hinterland from the user's perspective. Employing exploratory factor analysis, the results revealed that the model structured around five factors incorporating geo-location and accessibility, availability, political supports, cost factors, and quality of business environment is valid and reliable in the context of the location selection factors for logistics distribution center in the context of port hinterland operations. The evaluation of Busan new port hinterland provides useful insights for strategic improvement to accommodate the users' expectation. Further, the model offers both a descriptive and diagnostic strategic management tool for port hinterland development and operations, to guide future improvement.

• Journal of Electrical Engineering and Technology
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• 제7권6호
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• pp.859-868
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• 2012

A new fault location algorithm based on stationary wavelet transform and its verification experiment results are described for HVDC submarine cables in this paper. For wavelet based fault location algorithm, firstly, 4th level approximation coefficients decomposed by wavelet transform function are superimposed by correlation, then the distance to the fault point is calculated by time delay between the first incident signal and the second reflected signal. For the verification of this algorithm, the real experiments based on various fault conditions and return types of fault current are performed at HVDC submarine cable test yard located in KEPCO(Korea Electric Power Corporation) Power Testing Center of South Korea. It proves that the fault location method proposed in this paper is very simple but very quick and accurate for HVDC submarine cable fault location.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 2004년도 추계학술발표회 발표논문집
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• pp.577-578
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• 2004

• 한국콘텐츠학회논문지
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• 제5권5호
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• pp.238-247
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• 2005

IT 관련 기술의 발전은 'Any Time, Any Where, Any Service'를 사용자에게 제공할 수 있는 제반 여건을 마련하였으며, 무선 인터넷 서비스는 인터넷 기반의 서비스를 이동 중에도 이용 가능하도록 하였다. 다양한 무선 콘텐츠 개발로 생활에 다양한 즐거움과 편리함을 제공하였다. 그러나 기존 무선 콘텐츠는 표준화된 환경에서 구축되지 않아 무선 인터넷 플랫폼에 종속적이었다. 따라서 콘텐츠 중복 개발로 인한 자원 낭비, 시간 낭비, 인력 낭비를 초래하고 있다. 본 논문은 JAVA를 이용하여 플랫폼에 독립적이며, WIPI기반 인공어초 검색 콘텐츠를 제안한다. 인공어초시설은 어민 소득 증대의 목적으로 국가가 시행하고 있는 사업이지만, 인공어초시설 위치 정보는 일부 어민들만 알고, 많은 어민들은 인공어초시설 위치조차 모르고 있는 실정이다. 따라서 본 논문은 WIPI 기반 인공어초 검색 콘텐츠를 개발하여 인공어초시설 위치 정보를 모르는 어민들과 조사들에게 인공어초시설 위치정보, 수심, 저질 등의 정보를 제공함으로써 어민들에게는 소득 증대를, 조사들에게는 대어를 낚을 수 있는 기회를 제공하고자 한다.

• 한국건축시공학회지
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• 제21권6호
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• pp.677-687
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• 2021

화재가 발생했을 때, 대피자가 화재 위치와 규모 등의 화재정보, 그리고 출구 위치와 대피자 스스로의 위치를 확인할 수 있다면, 신속하게 대피할 수 있을 것이다. 본 연구에서는 화재정보를 대피자에게 전송하고 대피자의 위치를 확인할 수 있는 시스템을 개발하였다. 선행연구를 통하여 시스템 개발에 필요한 요구사항을 네 가지 도출하였다. 요구사항에는 시스템이 작동하는데 필요한 전력이 크지 않아야 하며, 화재정보를 송·수신하기 위해서 필요한 거리 제한과 추가 장비, 그리고 중앙 서버가 없어도 시스템이 작동할 수 있어야 한다는 것이 포함된다. 이와 같은 요구사항을 기반으로, 본 연구에서는 건물 화재정보를 대피자의 모바일 기기로 전송할 수 있고, 대피자의 위치를 추적할 수 있는 서버 독립형 시스템을 개발하였다. 개발된 시스템은 화재정보를 전송하는 장치와 화재정보를 수신하고 대피자 위치를 추적할 수 있는 모바일 기기의 어플리케이션으로 구성된다. 화재에 의해서 중앙 서버가 손상되어도 대피자는 개발된 시스템을 사용하여 화재 위치와 규모, 출구의 위치와 대파자의 위치를 확인할 수 있으므로, 인명피해를 감소시키는데 기여할 수 있을 것이다. 또한, 실내위치추적에 사용되는 fingerprint 알고리듬의 사용성 향상을 위한 이론적 기초로도 활용될 수 있을 것이다. Fingerprint 사용을 위한 데이터베이스를 구축할 때에 소요되는 노력과 비용을 감소시키는 방법을 제안했기 때문이다.

• 한국연소학회지
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• 제18권1호
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• pp.1-6
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• 2013

Authors' previous works on thermoacoustic(TA) model development showed good results in predicting combustion instability characteristics in a gas turbine combustor. However, they also suggested there were some limitations in growth rate estimation, which might be related with over-simplification of flame structure. As a first trial for improving the model accuracy, the current paper introduces the modified TA model considering the actual flame location in the combustor. The combustor is divided into the unburned and the burned area before and after the flame location, and then acoustic equations are re-organized. The modified TA model results show a better accuracy in predicting the growth rate of instabilities comparing with the previous results. However, obtained results still overestimate the conditions where the combustor goes unstable. Further researches considering heat release distribution through flames are required.

• 전기학회논문지
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• 제65권10호
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• pp.1774-1779
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• 2016

This paper proposes a portable cable fault detection system with automatic fault distinction and distance measurement using time-frequency correlation and reference signal elimination method and automatic fault classification algorithm in order to have more accurate fault determination and location detection than conventional time domain refelectometry (TDR) system despite increased signal attenuation due to the long distance to cable fault location. The performance of the developed system method was validated via an experiment in the test field constructed for the standardized performance test of power cable fault location equipments. The performance evaluation showed that accuracy of the developed system is less than 1.34%. Also, an error of automatic fault type and location by detection of phase and peak value through elimination of the reference signal and normalization of correlation coefficient and automatic fault classification algorithm not occurred.

• 전기학회논문지
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• 제57권2호
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• pp.184-190
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• 2008

The fault location algorithm based on stationary wavelet transform was developed to locate the fault point more accurately. The stationary wavelet transform(SWT) was introduced instead of conventional discrete wavelet transform(DWT) because SWT has redundancy properties which is more useful in noise signal processing. In previous paper, noise cancellation technique based on the correlation of wavelet coefficients at multi-scales was introduced, and the efficiency was also proved in full. In this paper, fault section discrimination and fault location algorithm using noise cancellation technique were tested by ATP simulation on real power cable systems. From these results, the fault can be located even in very difficult and complicated situations such as different inception angle and fault resistance.

• 한국IT서비스학회지
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• 제9권1호
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• pp.127-139
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• 2010

Due to the development of information technology and business related to geographical location of customer, the need for the storage and analysis of geographical location data is increasing rapidly. Geographical location data have a spatio-temporal nature which is different from typical business data. Therefore, different methods of data storage and analysis are required. This paper proposes a multi-dimensional data model and data visualization to analyze geographical location data efficiently and effectively. Purchase order data of an online farm products brokerage business was used to build prototype datamart. RFM scores are calculated to classify customers and geocoding technology is applied to display information on maps, thereby to enhance data visualization.

• 교육녹색환경연구
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• 제11권2호
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• pp.38-50
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• 2012

The purpose of this study was to Improvement proposal on Item and Detailed Method for Education Environment Evaluation, Focused on School Location. This Study are as follows. 1. Research on Location Theory and relation Law 2. Improving research by School Experts(Health&construction& administration) 3. Present a Detailed quantitative assessment criteria 4. Pilot Survey on Education Environment Evaluation So, this result will be used in decision-making-process of land use planning, public land development construction, urban design and city policy.