• 한국정보과학회논문지:시스템및이론
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• 제33권11호
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• pp.810-819
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• 2006

본 논문에서는 네트워크 통신에서 혼잡으로 인한 패킷의 손실을 최소화하기 위하여 새로운 버퍼 모델인 적응적인 이중 버퍼 모델을 제안한다. 이는 제약된 메모리 환경에서 송수신 버퍼가 서로의 여유 공간을 공유하여 패킷의 손실을 최대한 줄일 수 있는 버퍼 모델이다. 또한 리스트와 비슷한 성능을 지니는 본 버퍼 모델은 자유 리스트를 사용한 버퍼와 달리 메모리 누수로 인한 버블(bubbles) 현상을 방지하므로 제한된 환경의 네트워크 버퍼에 적용할 수 있으며 배열을 사용하는 경우와 비교 할 때 최대 100% 성능 향상을 기대할 수 있다.

• International Journal of Human Ecology
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• 제5권1호
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• pp.23-34
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• 2004

This paper outlines the findings of a consumer survey conducted in 1996 and 2001 by the University of Bonn, Germany, across 15 European countries. The survey involved a sample of 3,300 respondents in 1996 and around 11,000 respondents in 2001, throughout all 15 EU countries. Children and adolescents between the ages of 10 and 17 were surveyed on their consumption habits and their attitudes towards the environment. The paper outlines the key findings on "the process of socialization with money". Children come to appreciate the importance of money even before their first day at school. Even young children know you sometimes need cash to fulfil dreams. But the chance to experiment with money for real only comes when children first receive pocket money, usually from their parents. Later, in adolescence, consumer pressure starts to make an impact and it becomes more difficult to make ends meet. Spare time or holiday jobs help top up pocket money and enable adolescents to keep out of debt. This paper reports on a long term comparative study throughout the European Union among children and adolescents, analysed by country, age group and gender. The paper discusses the places young consumers can turn to in trying to fulfil their growing consumer needs. It also examines how much money is at their disposal. It then concludes by considering the influence of "financial socialization" on how young people deal with money.

• 전기학회논문지
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• 제66권7호
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• pp.1007-1016
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• 2017

This paper aims to analyze the safety evaluation of the existing transformer for the 0.85 millions of public rental apartments as EVs(Electric Vehicles) increase in order to overcome the environment pollution issue and maintain sustainable development. It is analyzed that the 56.4% capacity of power transformer could secure as EV charging infrastructure, based on the analysis of respective utilization patterns of the housing and power transformer. The acceptable number of EVs is 0.04~0.06 per household from the spare capacity of the power transformer. It is analyzed that EV stock is prospected less than 0.03 per household in 2030, considering the condition of the public rental apartments residents and the growth rate of EVs according to practical scenario. The power demand for EVs is within the allowable capacity range of the power transformer, so the research shows that there is no problem in the stability of the existing transformer until 2030.

• 정보처리학회논문지A
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• 제19A권3호
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• pp.155-160
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• 2012

본 논문은 기능성 게임의 주요소인 재미와 학습 그리고 본인의 게임 점수 향상을 통한 성취감 배양을 통해 언제 어디에서나 자투리 시간을 활용하여 수열 문제 학습 능력을 향상시킬 수 있는 스마트폰 기반의 수열 퀴즈 어플리케이션을 설계하였다. 또한 최근 대중화된 유비쿼터스 환경에서 기능성 게임을 통한 수열 문제에 대한 학습 효과를 검증하기 위해 여러 종류의 수열 문제들로 구성된 기능성 게임을 아이폰과 안드로이드 환경 기반으로 구현하고, 수열 게임 사용자들의 점수 기록을 바탕으로 사회통계학적 분류에 따른 게임 사용자 특성 및 학습 효과를 분석하였다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권5호
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• pp.1951-1972
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• 2018

Wi-Fi Access Point (AP) optimization approaches are used in indoor positioning systems for signal coverage enhancement, as well as positioning precision improvement. Although the huge power consumption of the AP optimization forms a serious problem due to the signal coverage requirement for large-scale indoor environment, the conventional approaches treat the problem of power consumption independent from the design of indoor positioning systems. This paper proposes a new Fast Water-filling algorithm Group Power Constraint (FWA-GPC) based Wi-Fi AP optimization approach for indoor positioning in which the power consumed by the AP optimization is significantly considered. This paper has three contributions. First, it is not restricted to conventional concept of one AP for one candidate AP location, but considered spare APs once the active APs break off. Second, it utilizes the concept of water-filling model from adaptive channel power allocation to calculate the number of APs for each candidate AP location by maximizing the location fingerprint discrimination. Third, it uses a fast version, namely Fast Water-filling algorithm, to search for the optimal solution efficiently. The experimental results conducted in two typical indoor Wi-Fi environments prove that the proposed FWA-GPC performs better than the conventional AP optimization approaches.

• 의학교육논단
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• 제22권3호
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• pp.198-206
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• 2020

This study aimed to identify needed improvements to current evaluation methods in medical school computer-based test (CBT) programs and test environments. To that end, an analysis of the importance and satisfaction was conducted through a survey of 3rd and 4th year medical students who had sufficient experience with CBT programs. Importance performance analysis methodology using the correlation coefficient was applied to assess average satisfaction and importance. The first quadrant (keep up the good work) was a factor of review and time management and test facilities among the conveniences of the CBT program. The second quadrant (concentrate here) was a factor of the convenience of the CBT program and computer monitor and chair factor within the test facilities. The third quadrant (low priority) was a factor of cheating and computer failure. The fourth quadrant (possible overkill) was the location, spacing, and temperature factors of the test facilities. Improvements are needed to reduce 'eye fatigue' and help students focus and understand the questions in the CBT programs. It is necessary to improve computer monitors, desks and chairs, and consider the subject's body type and manager in order to cope with computer breakdown and peripheral failures. Spare computers are needed. These findings are meaningful in that they have been able to identify factors that require improvement in the CBT program and test environment resulting from changes in assessment tools.

• 한국인터넷방송통신학회논문지
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• 제10권3호
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• pp.75-82
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• 2010

한국의 DTV 서비스는 채널 14~51 (470 MHz~698 MHz)에 할당이 계획되어 있다, 이에 본 논문은 DTV 서비스가 채널 51 (692 MHz~698 MHz), CDMA 서비스가 채널 52 (698 MHz~704 MHz)에 할당된다고 가정한 후, Minimum Coupling Loss (MCL) 방법을 이용하여 보호 이격 거리를 산출하고 Spectrum Engineering Advanced Monte Carlo Analysis Tool (SEAMCAT)을 이용하여 5 % 간섭 확률을 만족하는 보호대역을 산출하였다. 그 결과 698.625 MHz에서 DTV 송신기와 CDMA Base Station (BS) 수신기 사이에서 665.67 km의 보호 이격 거리가 산출되었고 최악 경우인 Rural 지역에서 DTV 송신기와 CDMA Mobile Station (MS) 수신기 사이에서 5 MHz의 보호 대역이 산출되었다. 또한 CDMA MS 송신기와 DTV 수신기 사이에서는 심각한 간섭 현상이 발생되지 않았고 최악 경우의 Urban 지역에서도 CDMA BS 송신기와 DTV 수신기 사이에서 6.25 MHz의 보호 대역이 산출되었다. 위의 분석 결과는 이후 DTV 서비스의 할당 이전에 선행되어야하는 DTV와 다른 통신 시스템간 간섭 고려에 유용한 기준을 제공할 것으로 기대된다.

• 디지털콘텐츠학회 논문지
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• 제5권1호
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• pp.22-27
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• 2004

밀폐 및 차폐 공간을 갖는 핫셀에서 사용후핵연료와 같은 고방사선 물질을 취급하고 있으며, 핵주기시설에서 마스터-슬레이브 매니퓰레이터는 원격취급장비로서 널리 사용되고 있다. 본 연구에서는 차세대관리공정의 디지털 목업을 구축하고 원격유지보수를 위한 매니퓰레이터의 작업영역 및 작업분석을 수행하였다. 실제 환경과 동일한 가상 작업환경을 갖는 디지털 목업은 3차원 그래픽으로 모델링된 공정장치 및 원격 취급장비들로 구성된다. 모델링된 매니퓰레이터는 기구학 및 동작범위에 대한 속성을 부여되고 외부 입력장치는 space ball을 사용하여 매니퓰레이터의 동작을 구현하였다. 또한 Tele-operation 인터페이스를 사용하여 6축 외부 입력장치와 연계한 시스템을 개발하였으며 외부 입력에 따른 매니퓰레이터의 동작에 대한 동기는 만족할 만한 응답을 보였다. 이는 가상환경에서 작업자 교육을 위한 시스템 개발에 유용할 것이다.

• 시큐리티연구
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• 제6호
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• pp.47-65
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• 2003

In Korea, Private security companies has steadily grown and amounts to 2,051 places as of November 30, 2002. Private security in korea is carrying out firm name role assignment to have held the police and public peace environment change factors for a standard faithfully, and protects social a little property that is a basic purpose, and it is spare no efforts in loss prevention. In spite of numeral increase of private security companies, private security companies have many problem. Moreover, they mostly did not have any remarkable in-house expertises in their own business under tough conditions. Under the unfavorable circumstances including insufficient investment and education in private security guard, there have been actually little further studies on private security business in practices. So this study mainly focused on addressing the installation security business managed by authorized companies, which amount to 96%(1,963 companies) of total 2,051 domestic security companies. Furthermore, the study formulated and modeled a series of business procedures in private security companies. A series of business procedures of private security companies can be modeled as follows : Setting of a business scope and aim market ${\Rightarrow}$ Marketing, Contact from customers(On-line or Off-line) ${\Rightarrow}$ Diagnosis of security target ${\Rightarrow}$ Submission of security operational plan ${\Rightarrow}$ Estimation of security operational plan ${\cdot}$ decision ${\Rightarrow}$ Contract ${\Rightarrow}$ Employment, selection of security guards ${\Rightarrow}$ Nomination of security guard instructors ${\Rightarrow}$ Education & training of security guards ${\Rightarrow}$ subscribe to insurance of damage liability ${\Rightarrow}$ Commitment and placement of security guards ${\Rightarrow}$ Establishment and preparation of security planning ${\Rightarrow}$ Field management and procurement of relevant security service.

• 복식
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• 제56권7호
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• pp.105-120
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• 2006

Today's radical change of environment and technology spreaded high-technology art by cutting across a general idea of art, expressed machine aesthetic in fashion style by influencing materials and production processes of fashion. The purpose of this research is to take another look at the value and the importance of ornaments in terms of fashion design, to overcome the negative aspect of Technology Fashion by designing Retro Technology Fashion that harmonizes reason with sensibilities through floral patterns. The results of this study are as followings. 1. If Retro technology Fashion was analyzed by time and space element that are postmodernism techniques, there are Ethnic Technology Fashion that are based on space and historical Technology Fashion that are based on time. In terms of spare element, there is the hybrid of revival of exotic folklore with Technology fashion. In terms of time element, there is the hybrid of costumes of before 20th Century with Technology Fashion. It means unifying detail or silhouette of costumes of ancient time to modern time wit Technology Fashion. For another time element, the hybrid of retro fashion after 20th Century with Technology Fashion. The retro nostalgia is revived by the floral patterns or silhouette of Hippie fashion unified with Technology Fashion. 2. Based on above research, Retro Technology Fashion with floral pattern on CAD were designed. As the results, for Ethno Fashion that is spatial retro, 'Asian Technology fashion' was designed with bright colors, China collar that are oriental, and vinyl material. For historical Technology fashion that are based on time, 'Space Middle Age' was designed with tight silhouette, party colored pants and plastic material.