• 대한통합의학회지
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• 제4권3호
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• pp.61-68
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• 2016

Purpose : The purpose of this study was to examine the differences in sit-to-stand movement and static standing balance between young adults and older adults Methods : Thirty young adults and thirty older adults participated in this study. The Good Balance System was used to assess participants' sit-to-stand movement and static standing balance. The sit-to-stand movement was measured as mediolateral and anterioposterior displacement of the centre of pressure (mm/s) while sit-to-stand on a force platform, and time required to complete a sit-to-stand movement on a force platform. The static standing balance was measured as mediolateral and anterioposterior displacement of the center of pressure (mm/s) and velocity moment (mm2/s) while standing on a force platform with opened eyes and with closed eyes. Result : A significant difference was found in the mediolateral and anterioposterior center of pressure displacement and the time required to complete a sit-to-stand movement of the two groups (p<.05). A significant difference between the groups was found as to mediolateral centre of pressure displacement and the velocity moment when standing with opened eyes and with closed eyes (p<.05). Conclusion : In conclusion, older adults showed decreased sit-to-stand movement and static standing balance ability compared to the young adult. Clinicians should consider sit-to-stand and balance training for older adult.

• 한국멀티미디어학회논문지
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• 제18권12호
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• pp.1586-1593
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• 2015

Calligraphy contents(shortly called, CalliContents) depict the feature of communication media with artistic sentences or drawings before being processed into digital contents to become printed advertisement, visual design and entertainment products. As a fast growing business model, they can be applied to every single scope of all fields these days and each application case presented excellent effects to grab consumers' attention immediately. In this paper, we designed and produced an emotional bi-directional recommendation DIY calligraphy contents platform to consume created cultural contents and boost personalized contents industry that meets consumer's needs through both wired and wireless-based software with convergence of artistic and emotional calligraphy contents and ICT. For this works, we established for DIY calligraphy consumers a foundation of a virtuous circle of the CalliContents where various CalliContents are provided in on and offline environment and a third party target is opened at the CalliContents platform

• 한국정보전자통신기술학회논문지
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• 제11권6호
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• pp.658-663
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• 2018

본 논문에서는 콘텐츠 큐레이션 플랫폼의 성능평가 알고리즘을 제안하였다. 성능평가는 초기조건과 종료조건을 설정하고, 4개의 파라미터를 측정하여 수행하였다. 성능평가에 사용되는 파라미터는 서비스 응답속도, 응답결과 정확도, 분석결과 정밀도, 분석결과 재현율이다. 제안한 성능평가 알고리즘의 유효성을 확인하기 위해 118,738건의 데이터베이스를 직접 구축한 후, 인터넷에서 콘텐츠를 오픈하여 이를 클릭한 사용자 행위를 기반으로 실험을 수행하였다. 실험에 사용된 페이지 뷰는 6,975,365건이었다, 실험결과, 4개의 파라미터를 이용하면 콘텐츠 큐레이션 플랫폼의 종합평가와 단위 평가가 객관적으로 수행될 수 있음을 확인하였다.

• 전기학회논문지P
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• 제59권2호
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• pp.158-162
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• 2010

PSD is automatically opened and closed when subway train arrive on the station. This system was designed to control electric automatic system. These doors will provide passenger safety, energy saving and a good environment in subway. The monitoring and control systems of PSD are configured so that they can be operated in automatic mode in connection with ATO through the composite control panel in the station control room. The objective of this paper is to obtain high reliability that is essential for monitoring and control systems of PSD. The power supply is based on protection circuit using DC power bridge from two UPS. Also, stable communication system consists of CAN communication line redundancy and RF cross protection algorithm. Monitoring state display results show the validity of the proposed high reliability monitoring and control systems of PSD.

• International Journal of Naval Architecture and Ocean Engineering
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• 제5권4호
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• pp.625-634
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• 2013

Energy is a direct restriction to the working life of an underwater mooring platform (UMP). In this paper, a vertical axis water turbine (VAWT) is designed to supply energy for UMPs. The VAWT has several controlled blades, which can be opened or closed by inside plunger pumps. Two-dimensional transient numerical studies are presented to determine the operating performance and power output of the turbine under low ocean current velocity. A standard k-${\varepsilon}$ turbulence model is used to perform the transient simulations. The influence of structural parameters, including foil section profile, foil chord length and rotor diameter, on the turbine performance are investigated over a range of tip-speed-ratios (TSRs). It was found that turbine with three unit length NACA0015 foils generated a maximum averaged coefficient of power, 0.1, at TSR = 2.

• 한국정보과학회논문지:시스템및이론
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• 제36권5호
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• pp.387-395
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• 2009

OSGi 서비스 플랫폼 환경에서는 개방된 게이트웨이에 대한 정당하지 않은 사용자의 침입과 허가되지 않은 자원의 접근과 같은 보안 취약성이 발생하므로 보안 아키텍처의 구축이 필수적이다. 본 논문에서는 OSGi 서비스 플랫폼 환경의 하드웨어적인 제약을 고려하여 대칭키를 이용한 자동화된 사용자 인증과 서비스 번들 인증 기법을 제안한다. OSGi 플랫폼 환경은 디바이스들의 입력 수단에 제약이 있으므로 패스워드 입력 과정을 생략하고 MAC address와 암호화된 식별자를 사용한 자동화된 사용자 인증 메커니즘을 연구하였다. 또한 서비스 번들을 위한 인증 메커니즘에는 대칭키를 이용하여 연산이 빠르고 시간 정보와 발급 정보가 담긴 티켓을 이용하여 안전한 인증 과정을 거칠 수 있도록 하였다. 이러한 두 가지 인증 메커니즘을 바탕으로 자원의 제약성을 해소하여 사용자와 관리자의 편의성을 높이고 패스워드 입력 대기 시간의 생략과 보안 인증에 필요한 연산을 줄여 OSGi 서비스 플랫폼 환경에서 효과가 있다고 분석하였다.

• 기술사
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• 제27권2호
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• pp.42-54
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• 1994

Nowadays communication network is steadily changing from a main body of telephone to a network which is creating new services such as multimedia etc. Jhis article introduces a bud of new service and new network which are able to sustain the above service. Including Korea, world advanced countries have been digitatizing their network with N-ISDN (narrowband ISDN) by e.g. 64K b/s and 1.5M b/s. New service by N-ISDN are extraordinary, though it can not solve all kinds of services. To solve these problems, a solving platform should be constituted. B-ISDN(broadband ISDN), as a platform has to be built to deal with almost all uinds of services, whatever the communication speed, communication mode or communication quality may be. Korea Telecommunication Authority(KTA) opened the narrowband ISDN(N-ISDN) at the end of 1993. This was one step previous opening of the broadband ISDN(B-ISDN) service scheduled to be rendered in 2001. B-ISDN, receiving and transmitting by far more information with high speed than the N-NSDN does, is one of G-7 Progects which the Korean government is driving foreward to raise the national scientific power to seven advan ced countries. This is also linked with an extremely high speed information network scheduled to be built by the Ministry of Communications in 2015.

• Journal of Platform Technology
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• 제8권1호
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• pp.33-40
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• 2020

본 연구의 목적은 교양 ICT활용 과정의 서술형 강의 평가에 대해 텍스트 마이닝의 토픽모델링 분석을 실시하여 수강생의 강의 선택 요인과 강의에 대한 긍정적·부정적 요소 파악을 하고자 하는데 있다. 이를 위해 M 대학교의 2019년 2학기에 개설된 ICT활용 과정 강의에 대해 '강의를 신청한 이유', '강의에서 개선되어야 할 점'과 '강의에서 좋았던 점'에 대한 데이터 전처리부터 키워드 빈도 분석, 워드 클라우드 시각화 및 토픽 모델링 분석을 실시하였다. 연구결과 M 대학의 2019년 2학기 ICT활용 과정은 자격증 취득을 위해 강의를 신청하며, 동시에 자격증을 취득할 수 있어 강의가 좋았다는 긍정적 분석을 알 수 있다. 부정적 요소로 강의실 사용 환경 불편에 대한 것을 알 수 있다.

• Journal of East Asia Management
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• 제1권1호
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• pp.65-87
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• 2020

In recent years, with the rapid development of network live streaming, with the popularization of mobile Internet and mobile terminal equipment, the live streaming industry has ushered in great development. A sudden outbreak of the COVID-19 makes the PC end live streaming which has been developed for many years enter a new era, giving birth to the rapid development of mobile end live streaming. Not only because of the expansion of the live streaming industry market, the rise of the trend of the national live streaming, but also because the mobile live streaming is more and more valued by the brand, becoming an important tool for brand communication and product promotion. It is because of its unique communication characteristics that some scholars believe that the era of precision marketing has been opened by live network. Mobile live from the initial fans to reward and promote the brand, to now in the form of live marketing, consumers can "buy while watching". The time period from the understanding of the goods to the final completion of the purchase behavior has been greatly shortened. It is conducive to improving sales volume and brand awareness. Marketing communication through mobile live platform has become a popular way of brand marketing. This paper mainly studies the current situation, methods, problems and development strategies of brand marketing activities with the help of live streaming platform under the background of mobile internet. Taking Tmall live streaming platform as an example, this paper analyzes several ways of brand marketing with the help of live streaming and some universal characteristics of live streaming marketing by using the relevant theories of marketing. In view of the problems existing in live streaming brand marketing, it puts forward relevant Improvement measures. First of all, the paper puts forward the innovation in content and form. Second, the paper suggests that we should make full use of new technologies such as AR and VR to effectively combine with mobile live broadcasting. Third, the paper explores the integration of multiple channels to create intelligent marketing, and further optimize the live interface of mobile terminals. Finally, the paper emphasizes that the government departments and the platform itself should jointly supervise the mobile network live streaming platform and establish a good live broadcasting environment for mobile terminals. With the help of mobile live streaming, the marketing mode has an important impact on the promotion of brand marketing. How to make better use of this business mode and accurately use mobile live broadcast to promote brand marketing, so that enterprises can create greater profits, is also of profound research significance.

• 한국HCI학회:학술대회논문집
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• 한국HCI학회 2009년도 학술대회
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• pp.654-659
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• 2009

최근 웹을 기반으로 하는 소프트웨어가 발전하면서, 웹을 통한 서비스가 점차 증가하고 있다. 이것 때문에 많은 연구기관과 보고서들이 웹을 소프트웨어의 플랫폼이라고 부르고 있다. 이렇게 웹 기술이 발전하는 동안 Wireless Sensor Network(WSN)의 미들웨어와 응용 서비스는 데스크탑의 운영체제 기반에서 개발되었다. 그래서 WSN의 기술은 데스크탑 어플리케이션의 한계점을 가지고 있다. 그리고 센서 노드의 하드웨어와 밀접한 관련이 있는 강 결합(Tightly-Coupled) 구조 때문에 WSN의 통합, 응용 서비스 배포, 유지보수 관리 등에 어려움이 있다. 이와 다르게 Web 은 약 결합(Loosely-Coupled)이고 개방된 시스템이기 때문에 Web Service 나 Rich Internet Application(RIA)는 이러한 한계점을 해결할 수 있도록 도와준다. 특히 RIA는 웹 어플리케이션이지만 데스크탑 어플리케이션과 비슷한 사용자환경과 다양한 통신방법을 제공하기 때문에 WSN 응용서비스의 플랫폼이 될 수 있다. 본 연구에서 WSN의 연결성과 접근성을 인터넷으로 확장시키고 RIA를 적용하여 실시간 메시지 시스템을 제안한다.