• Journal of the Korean Association of Geographic Information Studies
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• v.26 no.3
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• pp.85-96
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• 2023

This study developed and evaluated a safe route guidance service for electric personal assistive mobility device used mainly by the mobility impaired people to improve their mobility. Thirteen underlying factors affecting the mobility of electric personal assistive mobility device have been derived through a survey with the mobility impaired people and employees in related organizations in Busan Metropolitan City. After assigning safety scores to individual factors and identifying the relevant factors along routes of interest with an object detection AI model, the safe route for electric personal assistive mobility device was provided through an optimal path-finding algorithm. As a result of comparing the general route of T-map and the recommended route of this study for the identical routes, the latter had relatively fewer obstacles and the gentler slope than the former, implicating that the recommended route is safer than the general one. As future works, it is necessary to enhance the function of a route guidance service based on the real-time location of users and to conduct spot investigations to evaluate and verify its social acceptability.

• Proceedings of the Korean Information Science Society Conference
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• 2004.10c
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• pp.265-267
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• 2004

애드 혹 네트워크에서 이동 모델은 가장 중요한 요인 중 하나이다. 또한 실험의 어려움 때문에 시뮬레이션을 통한 성능 명가가 애드 혹 네트워크에서는 꼭 필요하다. 하지만 현재 존재하는 애드 혹 네트워크 시뮬레이션에서는 3 차원 이동 환경이 전혀 고려되지 않은 이동 모델을 사용하고 있다. 즉 현재의 시뮬레이션 이동 모델은 3차원에서 이동 하는 실제의 이동 형태를 정확하게 반영 못하고 있다. 본 논문에서는 장애물 까지 포함하는 좀더 현실적인 3차원 이동 모델을 제시하고, 그것의 시뮬레이션 방법을 제시 한다. 3DMG를 통해 3차원 이동 정보와 장애물 정보를 만들고, 그러한 정보를 Glomosim 시뮬레이션 툴에 입력하여, 3차원 이동 모델에 따른 시뮬레이션이 가능하게 만들었다. 또한 본 논문에서는 이러한 방법에 의한 예제 시뮬레이션을 보여주며, 이를 통해 3차원 이동 모델의 효과를 보여준다.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.05a
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• pp.285-286
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• 2001

양식장에서 빈번하게 발생할 수 있는 스트레스 요인은 인위적 및 환경적 요인으로 나뉘어지며, 어류의 성장과 항상성 유지에 상당한 영향을 미치는 것으로 알려져 있다(Pickering, 1992). 인위적 스트레스 요인중 성장차이가 나는 어류를 같은 크기의 그룹으로 조절하는 선별작업은 양식장에서 피할 수 없는 관리사항의 하나이며, 빈번하고도 난잡한 선별작업은 어류에게 상당한 스트레스 요인으로 작용할 것이다. (중략)

• Proceedings of the Korean Information Science Society Conference
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• 1998.10a
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• pp.276-278
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• 1998

본 연구에서는 이동 컴퓨팅 환경에서 TCP프로토콜의 전송성능 저하요인을 분석하고 이에 따른 적응적인 정책을 수입해 효율적인 프로토콜을 제시한다. 이동 컴퓨팅환경에서 TCP 패킷을 크기에 따라 벌크데이터와 인터액티브데이터로 나누고, 무선링크의 상태에 따라 안전 상태와 위험 상태로 나누어 각각의 특성을 고려한 TCP의 전송성능 향상방법을 제시하였다. 본 연구에서 제안된 정책은 모의 실험 환경을 통해 성능향상을 검증했으며, 실제 이동 컴퓨터환경에서 무선 네트워크와 유선 네트워크사이의 중간 호스트인 기지국에 적용시킬수 있다.

• Proceedings of the Korea Multimedia Society Conference
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• 2002.11b
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• pp.617-621
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• 2002

현재 잘 갖추어진 정보통신 인프라에서 이동통신사들이 제공하는 서비스들이 각기 다른 무선 마크업 언어를 사용하고 있어 하나의 컨텐츠를 제공하기 위해서는 각 이동통신사별로 별도의 추가 개발이 이루어져야 하는 등 서비스 발전에 장애 요인이 존재한다. 본 연구에서는 이러한 국내외 무선 인터넷의 현실을 고려하여 무선 인터넷 컨텐츠의 생산성 향상 또는 서비스의 질적 향상을 위하여 유무선 인터넷 컨텐츠들을 이동 단말기들에 적합하도록 변환 작성하여 전송해주는 프럭시(proxy)를 개발하였다. 본 연구의 특징은 metaXML로 정의된 중간 언어를 채택하여 서로 다른 마크업 언어로 작성된 컨텐츠들을 효과적으로 변환할 수 있다.

• Proceedings of the Korean Information Science Society Conference
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• 2000.04a
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• pp.214-216
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• 2000

분산 네트워크 환경에서 단절점의 존재는 신뢰성을 떨어뜨리는 주요한 요인이며, 통신 트래픽의 부하가 집중될 수 있는 지점이다. 본 논문에서는 분산 이동 컴퓨팅 환경을 갖는 네트워크상에서 분산 깊이 우선 탐색 방법을 이용하여 단절점을 찾는 효율적인 방법을 제안 한다. 시작 노드는 단절점을 발견하기 위한 이동 에이전트를 인접한 노드에 보내고, 파견된 이동 에이전트는 네트워크상의 각 노드들을 차례로 방문하여 깊이 우선 번호를 기본으로 하여 단절점을 찾게 된다.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.19 no.12
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• pp.1394-1401
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• 2008

This work investigates the effects of vibration on the passive intermodulation distortion characteristics of base station antennas for 800 MHz CDMA mobile communication systems. In general, base station antennas are located at high positions such as on building rooftops or iron towers. Thus the antennas are always affected by random vibrations, coming from various natural environmental factors such as rain and wind, or from living environmental factors such as vehicles and trains passing by. The measured intermodulation distortion characteristics before and after vibration accelerated degradation test show that vibrations are indeed the main cause for the intermodulation distortion performances of such antennas. To minimize the effects of vibrations, a new antenna design isptoposed that has an improved tolerance for vibrations. Experimental results show that the proposed antenna design dramatically reduces the degradation of the intermodulation distortion more than 35 dB.

• The Journal of the Korea Contents Association
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• v.12 no.1
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• pp.500-507
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• 2012

The purpose of this study was to investigate the effects of medicine ball throwing for weight shift training, that make improvements on golf physical fitness and performance. This training was related to physical fitness and golf performance in beginner golfer, undergraduates 20 males(10 exercise groups, 10 control groups) during 10 weeks. Variables were strength, flexibility, headspeed and distance. Training course were devided 2 sessions. In 1 to 5 weeks, using 3kg medicine ball, in 5 to 10 weeks, using 5kg medicine ball. Throwing method imitated golf swing, address, backswing, follow-through by throwing medicine ball. The Results were as follows; Medicine ball throwing for weight shift training showed significant difference in strength, flexibility, headspeed and distance in Exercise Group statistically. In conclusion, Medicine ball throwing for weight shift training improved strength, flexibility, headspeed and distance. So, it could be considered very effective training method as warming-up and main exercise.

• Journal of the Society of Disaster Information
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• v.16 no.3
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• pp.479-492
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• 2020

Purpose: The purpose of this study is to analyze the impact of regional characteristics on population movement on the Seoul metropolitan areas. Method: To this end, 66 basic entities in the Seoul metropolitan area were divided into three regions by analyzing the demographic movement data from 2010 to 2016 and the factors for determining population movement within and between regions were identified by applying a stepwise regression technique. Result: The major analysis confirmed that the increase in the number of apartments in all areas of the Seoul metropolitan area, the increase in the number of single-family homes, the increase in the number of employees, the increase in manufacturers, the growth rate of knowledge, culture, and leisure industries, the increase rate of GRDP, and the opening of new subway stations. In particular, the growth rate of the number of apartments, the growth rate of the knowledge, culture and leisure industries, the increase rate of GRDP, and the opening of new subway stations played a positive role in increasing population inflow. Conclusion: The result showed that by region, the growth rate of knowledge, culture and leisure industries contributed greatly to the inflow of population in the first region, and that the opening of new subway stations and the increase of GRDPs were the main factors. The increase in the number of apartments and subway stations were the main factors in the three areas.

• Korea Trade Review
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• v.42 no.1
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• pp.1-25
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• 2017

By applying the AHP(Analytic Hierarchy Process), we have analyzed the importance and the order for priorities to the management risk factors of Korean SMEs & Venture companies in China. The major management risk factors of manufacturing companies were the rise in labor costs followed by fierce competition in the marketplace, problems involved with human resource management and the rise in the cost of materials. In the case of companies manufacturing electronic products, the rise of labor costs and alteration in government's tax policy were seen as the main risk factors. In the case of chemical product manufacturing companies, the reinforcement of environmental protection law and in automobile component manufacturing companies, apart from the rise in labor cost, the increase in raw materials costs were analyzed as the main risk factors. While considering the time period, the main risk factors of the companies that entered China in the 1990's were fierce competition and alteration in government's tax policy and for the companies that entered China in the 2000's, increase in raw material cost, the rise in labor cost etc were analyzed to be the main risk management factors.