• 한국컴퓨터정보학회논문지
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• 제6권4호
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• pp.125-130
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• 2001

이 논문에서는 2개의 OTA를 이용하여 전압제어 이득을 갖는 증폭기의 설계에 대하여 연구하였다. 이를 위하여 먼저 선형동작을 할 수 있는 OTA를 설계하였으며, 설계된OTA 2개를 이용하여 증폭기를 구성하였다. 이 설계에서 OTA는 open-loop로 사용되었다. 컴퓨터 시뮬레이션 결과 설계된 OTA와 증폭기의 특성은 이론 값과 매우 잘 일치하였다. 또한 이 회로는 선형성이 우수하며 저잡음 광대역 증폭기로 동작시킬 수 있다.

• 한국정보통신설비학회:학술대회논문집
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• 한국정보통신설비학회 2008년도 정보통신설비 학술대회
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• pp.21-24
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• 2008

In this paper, Designed Quadrature hybrid coupler apply Open-PI equivalent transmission line. Using the proposed structure we achieve significant size reduction with the same results of conventional quadrature hybrid coupler at 912MHz. The measured frequency responses agree well with simulated one.

• 한국항해항만학회지
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• 제33권5호
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• pp.369-374
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• 2009

최근 워터프런트의 개방성과 자연환경을 만끽하기 위한 중요한 공간으로서 오픈스페이스와 이에 연계된 노천카페 및 야외레스토랑의 계획이 많아지고 있다. 그러나 워터프런트는 낮은 기온, 강풍, 강한 일사 등 도심 및 내륙지역과는 다른 기후특성을 가지고 있기 때문에 노천카페, 야외레스토랑 등을 계획할 때에는 대상 워터프런트의 기후특성, 특히 풍환경에 대한 검토가 필요하다. 본 연구는 부산의 대표적 워터프론트인 해운대, 수영만, 광안리 지역을 대상으로 오픈스페이스와 노천카페 및 야외레스토랑 계획을 위한 워터프런트의 풍환경에 대해 검토하였다. 검토경과를 요약하면 아래와 같다. 1)해운대-광안리까지의 워터프런트는 야외레스토랑 등에 적합한 지역이다. 2)3월말에서 11월 까지가 야외레스토랑 등을 이용하기에 적합한 시기이다.

• 한국지반공학회논문집
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• 제18권4호
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• pp.199-206
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• 2002

개단말뚝의 지지력은 관내토증분비(IFR)에 의해 정량화 될 수 있는 말뚝의 폐색정도에 큰 영향을 받는다. 그러나 대부분의 지지력 산정식들은 IFR에 따른 지지력의 변화를 고려하지 못하고 있는 실정이다. 본 연구에서는 모형말뚝시험의 결과에 근거하여 IFR을 이용한 개단말뚝의 지지력산정식을 제안하였다. 또한 자갈질 모래지반에서 각종 계측기가 부착된 실대형 개단말뚝을 이용하여 말뚝재하시험을 수행하였으며, 말뚝이 타입되는 동안 말뚝의 IFR을 연속적으로 측정하였다. 그리고 본 연구의 일부로 수행된 실대형 말뚝시험의 결과를 포함한 두 가지 경우의 말뚝재하시험 결과를 이용하여 새로 제안된 지지력산정식의 정확성을 평가하였다. 말뚝의 지지력에 대한 측정치와 예측치의 비교를 통하여 본 연구에서 제안된 지지력산정식은 만족스러운 예측결과를 주는 것으로 나타났다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권2호
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• pp.1089-1104
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• 2017

We have developed an information management tool for the EDISON (EDucation-research Integration through Simulation On the Net) open platform. EDISON is, at present, a web-based simulation service for education and research in five computational areas, namely, nanophysics, fluid dynamics, chemistry, structural dynamics, and computer aided optimal design. The EDISON open platform consists of three tiers: EDISON application framework, EDISON middleware, and EDISON infra-resources. The platform provides web portals for education and research in areas such as computational fluid dynamics, computational chemistry, computational nanophysics, computational structural dynamics, and computer aided optimal design along with user service. The main purpose of this research is to test the behavior of the release version of the EDISON Open-Platform under normal operating conditions. This management tool has been implemented using the RESTful API designed in EDISON middleware. The intention is to check co-operation between the middleware and the infrastructure. Suggested tools include User management, Simulation and Job management, and Simulation software (i.e., solver) testing. Finally, it is considered meaningful to develop a management tool that is not supported in other web-based online simulation services.

• 한국CDE학회논문집
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• 제16권2호
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• pp.92-103
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• 2011

The construction industry consists of various and massive architectural information as an architectural process includes a variety of design stages with cooperation of many disciplines. A Building Information Modeling (BIM) serves as a shared knowledge resource for information about a facility forming a reliable basis for decisions during its life-cycle from inception onward. building SMART has developed Industry Foundation Classes (IFC) standard for interoperability of BIM based information. Several software tools are already IFC-compliant. However, there are a lot of problems related to efficient interoperability of software owing to the lack of guide regarding the software usage and insufficiency IFC interfaces of software. The purpose of this study is to suggest efficient IFC support interface development methodologies of existing IFC certified software. The scope of this study is interoperability test for open BIM based quality assurance. To achieve this purpose, the authors have classified subject of open BIM based quality assurance and investigated IFC certification process and certified software. In addition, the authors have exported and imported via IFC files using different IFC interfaces in the software for interoperability of architectural objects and their properties. Finally, the authors have suggested IFC support interface development methodologies and hereafter direction for efficient interoperability of IFC certified software based on open BIM.

• 한국유체기계학회 논문집
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• 제5권4호
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• pp.11-18
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• 2002

A turbopump system composed of two pumps and one turbine is considered. The turbine composed of a nozzle and a rotor is used to drive the pumps while gas passes through the nozzle and potential energy is converted to kinetic energy, which forces the rotor blades to spin. In this study, an aerodynamic design of turbine system is investigated with some pre-determined design requirements (i.e., pressure ratio, rotational speed, required power, etc.) following Liquid Rocket Engine (L.R.E.) system specifications. For simplicity of turbine system, impulse-type rotor blades for open-type L.R.E. have been chosen. Usually, the open-type turbine system requires low mass flow-rate compared to close-type system. In this study, a partial admission nozzle is adopted to maximize the efficiency of the open-type turbine system. A design methodology of turbine system was introduced. Especially, partial admission nozzle was designed by means of simple empirical correlations between efficiency and configuration of the nozzle. Finally, a turbine system design is presented for a 10 ton thrust level of L.R.E.

• Structural Engineering and Mechanics
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• 제54권1호
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• pp.19-33
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• 2015

Open ground storey (OGS) buildings are characterized by the sudden reduction of stiffness in the ground storey with respect to the upper infilled storeys. During earthquakes, this vertical irregularity may result in accumulated damage in the ground storey members of OGS buildings without much damage in the upper storeys. Hence, the structural design of OGS buildings needs special attention. The present study suggests a modification of existing displacement-based design (DBD) procedure by proposing a new lateral load distribution. The increased demands of ground storey members of OGS buildings are estimated based on non-linear time history analysis results of four sets of bare and OGS frames having four to ten storey heights. The relationship between the increased demand and the relative stiffness of ground storey (with respect to upper storeys) is taken as the criterion for developing the expression for the design lateral load. It is also observed that under far-field earthquakes, there is a decrease in the ground storey drift of OGS frames as the height of the frame increases, whereas there is no such reduction when these frames are subjected to near-field earthquakes.

• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2014년도 제49차 동계학술대회논문집 22권1호
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• pp.127-130
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• 2014

여행지에서 제공하고 있는 스탬프 투어링 서비스는 여행객들에게 특별한 기념이 되어주고 있지만, 스탬프를 받기 위한 장소를 찾기 어려운 점과 여행지의 주변 정보를 얻기 위해서는 여행자의 별도의 노력이 필요하다는 단점이 있다. 이러한 문제를 해결하기 위해 유명 관광지 및 추천 명소 등에 NFC 태그를 설치하고 간단한 태깅만으로 스탬프를 수집할 수 있는 어플리케이션을 제안한다. 또한 이 어플리케이션에 저장되는 정보와 평가를 이용해 사용자별 맞춤 여행 코스를 제공하고 사용자가 좀 더 편리하고 재미있는 여행을 즐길 수 있도록 돕고자 한다.

• 디지털산업정보학회논문지
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• 제15권3호
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• pp.1-14
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• 2019

The 4th Industrial Revolution, intelligent automobile application technology is evolving beyond the limit of the mobile device to a variety of application software and multi-media collective technology with big data-based AI(artificial intelligence) technology. with the recent commercialization of 5G mobile communication service, artificial intelligent automobile technology, which is a fusion of automobile and IT technology, is evolving into more intelligent automobile service technology, and each multimedia platform service and application developed in such distributed environment is being developed Accordingly, application software technology developed with a single system SoC of a portable terminal device through various service technologies is absolutely required. In this paper, smart device design for ontology design of intelligent automobile open platform enables to design intelligent automobile middleware software design technology such as Android based SVC Codec and real time video and graphics processing that is not expressed in single ASIC application software technology as SoC based application designWe have experimented in smart device environment through researches, and newly designed service functions of various terminal devices provided as open platforms and application solutions in SoC environment and applied standardized interface analysis technique and proved this experiment.