• 교육시설 논문지
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• 제22권2호
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• pp.15-22
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• 2015

The latest educational curriculum in Korea started in 1997, and the 'Departmentalized Classroom System', which is a distinguishing modern concept compared with conventional pedagogy, has already been used in several high schools since 2009 and will be expanded to all middle school and high schools by 2014. However, most Korean schools are not yet physically ready to implement the new system. Moreover, despite many trials during the last three years, the characteristic and architectural function of a place called 'Home-base' is still vague and has caused many controversial arguments. In fact, a large number of home-base designs failed to accomplish their original task and there are counter evidences that shows reality was quite different over architect's personal and subjective radical plan. Therefore, this study seeks to introduce and objective scientific method based on an mathematical model of an optimized algorithm for planning a home-base area in a school design. The algorithm developed in this study is designed to determine the most efficient location for a home-base area to minimize the distance students typically need to walk.

• 한국정보처리학회논문지
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• 제7권2호
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• pp.426-436
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• 2000

이동 통신환경에서 이동노드들은 기지국(base station)을 통하여 통신하므로, 기지국은 트래픽의 발신지 및 착신지로서 데이터 트래픽, 위치정보 트래픽 등과 같이 처리비용이 다른 이종의 트래픽을 발생한다. 그러데, 하나의 위치 정보 서버는 물리적으로 제한된 용량으르 다지므로 여러 대의 위치정보 서버를 분산시켜 구축할 필요가 있는데, 이때 기지국을 최적으로 클러스터링하고 각 클러스터마다 하나의 위치정보서버를 할당해야 한다. 본 논문에서는 기지국이 선형으로 배열된 이동 통신망에서, 서로간에 다양한 형태의 트래픽을 발생하는 n개의 기지국이 주어졌을 때, 전체 네트워크에 대한 통신비용을 최소화하기 위하여 이들을 m($1{\le}m{\le}n$) 개의 인접한 클러스터(disjoint cluster)로 분리하는 문제를 고려한다. 이를 위하여, 본 논문에서는 주어진 트래픽이 클러스터 내부에서 발생할 때와 클러스트간에 발생할 때의 통신비용 차이를 반영한 상대비용(relative cost) 개념을 도입하여 O($mm^2$)의 동적 프로그래밍(dynamic programming) 알고리즘을 제시한다. 또한 이 알고리즘은 하나의 클러스터에 대한 크기제한과 전체 네트워크에 허락된 총 통신비용이 제악조건으로 주어질 경우, 같은 계산시간 내에 모든 유효한 클러스터를 찾아 낼 수 있음을 보인다.

• IEIE Transactions on Smart Processing and Computing
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• 제1권2호
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• pp.117-124
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• 2012

A client collaboration (CC) system is proposed for a user relay system. The proposed scheme focuses on the management of transmit power and leakage interference. In the proposed CC system, edge users transmit signals to the masters considered as user relays. The masters relay the signals of the edge users to the base station using the resource blocks (RBs) that are assigned to the edge users. The leakage interference and power consumption were analyzed in the CC system. In addition, an optimal master location problem was formulated based on the signal-to-leakage-plus-noise ratio (SLNR). Because the optimal master location problem is quite complex, a sub-optimal master location problem was proposed and a closed-form sub-optimal master location was obtained. The edge users generate smaller leakage interference and power consumption in the proposed CC system compared to the system without the CC. The numerical results showed that the edge users generate smaller leakage interference and power consumption in the proposed CC system compared to the system without the CC, and the average throughput increases.

• 한국주거학회논문집
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• 제10권2호
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• pp.213-222
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• 1999

This study, from conditions connected with water in Feng-Shui theory, is to find out their influence of the location and spatial composition of the studied villages, Hawei and Yangdong, and then to offer the result as basic data for the study of the traditional village in the future. The study method is to analyze topography by the map and present state of villages studied, to interprete them on the base of location, spatial composition, and chi, and then to analyze the relevancy of Feng-Shui theory of them. The result of the study are to be following: Houses of Hawei village are situated on the inside of a winding stream of waterway, while those of Yang dong village are located on the outside of a winding stream of waterway. In case of Hawei village, showed the close interrelation between the distribution of present houses and running speed of waterway by positin. Judging from the location, orientation and surroundings of mountains and waterway, topographical composition of Hawei village is Duk su guk, but that of Yang dong village is Juang feng guk. Comparing with Yang dong and Hawei in location and spatial composition, the conditions of waterway as being locational factor, for example, the geomancy of situation, orientation, and phisical phenomena(lenth, width, and depth of waterway in front of village) of waterway, are more importantly considered in Hawei village being situated on even land than in Yang dong located at the foot of the mountain.

• 한국시스템다이내믹스연구
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• 제8권1호
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• pp.67-95
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• 2007

This paper focuses on prototype management models of location conflict concerned with crematory facilities in Korea. Using causal loops and stock-flow diagrams, it examines behavioral patterns of key variables, which would contribute to developing objective evaluation criteria. After a series of simulation works, the paper finds that the top priority should be given to how to improve neighboring residents' perception, ahead of specific compensation issues. Otherwise, they are open to vicious cycles or impasse. Juxtaposing individual cases together, Pusan and Cheongju examples which experienced the extreme confrontation in the initial stage could succeed in resolving crematory location conflict, especially between local residents and the public authorities, as the latter has repeatedly guaranteed to the former higher standards of participation. The opposite was almost true for Seoul and Ulsan cases, both of which were drawn into a crematory location whirlpool, incrementally losing resident's participation base. These results imply that the proposed management models would enhance mutual understanding among major stake-holders in relatively a shorter time, not to mention the overall cost.

• 한국공작기계학회논문집
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• 제15권5호
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• pp.104-113
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• 2006

The main objective of this study is to investigate the effect of compounded welding by using acoustic emission (AE) signals and doing a source location for weld heat affected zone (HAZ) through tensile testing. This study was carried out an SWS 490A high strength steel for electric shield metal arc welding, SMAW; $CO_2$ gas metal arc welding, GMAW($CO_2$); and gas tungsten arc welding, GTAW/TIG. Data displays are based on the measured parameters of the AE signals, along with environmental variables such as time and load. For instance, Gutenberg-Richter magnitude-frequency relationship (G-R MFR) offers useful b-value in data analysis. Namely event identification, source location gives the X- and Y-coordinates of the AE source. And K-means clustering analysis by Euclidean distance confirmed that was powerful to source location. Generally, strength of welded metal zone was stronger than strength of base metal. As the result, confirmed certainly that fracture is produced in HAZ instead of welded metal zone from source location.

• 제어로봇시스템학회논문지
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• 제14권8호
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• pp.752-759
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• 2008

In this paper, we propose a high accurate geo-location system based on a single base station, where its location is obtained by Time-of-Arrival(ToA) and Direction-of-Arrival(DoA) of the radio signal. For estimating accurate ToA and DoA information, a MUltiple SIgnal Classification(MUSIC) is adopted. However, the estimation of ToA and DoA using MUSIC algorithm is a time-consuming process. The position tracking bias is occurred by the time delay caused by the estimation process. In order to mitigate the bias error, we propose the estimation method of the position tracking bias and compensate the location error produced by the time delay using the position tracking bias mitigation. For accurate self-localization of mobile robot, the Unscented Kalman Filter(UKF) with position tracking bias is applied. The simulation results show the efficiency and accuracy of the proposed geo-location system and the enhanced performance when the Unscented Kalman Filter is adopted for mobile robot application.

• 디지털콘텐츠학회 논문지
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• 제12권4호
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• pp.611-618
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• 2011

본 논문은 XML(eXtensible Markup Language) 파싱(parsing)기법을 이용한 안드로이드 기반의 날씨 정보 어플리케이션의 설계 및 구현에 관한 사항이다. GPS 위치 프로바이더와 XML 파싱기법 이용하여 현재 위치에 따라 날씨 정보가 변하게 된다. 또한 알람 시스템을 이용하여 어플리케이션의 접속과 종료에 상관없이 알람 이벤트가 발생 될 때의 시간을 기준으로 날씨 정보를 음성(English)으로 출력한다. 모든 어플리케이션에서 사용자 인터페이스는 앱의 첫 인상이 중요하기 때문에 복잡하지 않고, 단순한 방법으로 사용자 인터페이스 설계를 하였다.

• 산업기술연구
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• 제28권A호
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• pp.97-104
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• 2008

Recently, interests on positioning system for location-based services have been significantly increased. Many indoor environment systems using fingerprint scheme have been designed to take more accuracy of positioning, but they are inefficient in adapting to change of environments. In this paper, we focus on a client-based positioning system over WLAN for decreasing installation cost and adapting to change of environments. In the proposed system, APs with stable RSSI are selected as base APs independently for each reference point. Experimental results show that proposed system expands service area approximately 20% much than traditional systems using K-NN algorithm and needs only 20% modification process to fingerprint data compare with traditional systems whenever environment conditions are changed.

• Journal of Welding and Joining
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• 제4권1호
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• pp.40-46
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• 1986

This investigation studied the toughness variations in the narrow gap weldment with the notch location. Specimens with the notch at the center of the weld metal showed the lowest toughness. As the location of notchmoves to fusion line, the impact properties improve reaching a maximum at the fusion boundaries. This improvement in toughness can be explained by the microstructural feature showing in the narrow gap weldment. "one pass/layer" technique performed in narrow gap welding results in the increased proportion of refined structure as approaching to fusion boundary from weld center and thus leave 100% refined structure along the fusion boundary. HAZ also shows 100% refined structure with respect to base metal structure accompanied with the significant suppression of ductile-brittle transition temperature.mperature.