• 한국방재학회:학술대회논문집
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• 2011.02a
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• pp.32-32
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• 2011

최근 국내외에서 친환경건축물에 관한 관심이 매우 높아짐으로 인해 콘크리트의 물량을 절감하여 이산화탄소량을 줄이는 중공슬래브는 다양한 형태로 세계적으로 개발이 되고 있는 추세이다. 특히 이방향 중공슬래브는 환경적인 측면에서 이방향 중공슬래브는 중공부 생성에 재생플라스틱을 활용하여 폐자원을 재사용하고, 콘크리트와 철근의 사용량 절감에 따른 화석에너지 및 이산화탄소 발생량을 감소한다는 장점이 있다. 또한 시스템 측면에서 이방향 중공슬래브는 기존의 철근콘크리트 플랫플레이트 바닥구조 시스템의 자중을 절감하여 구조체를 경량화 시키고, 이에 따라 장스팬 구현이 가능하며, 단열효과가 뛰어나다. 이와 같이 이방향 중공슬래브는 장점이 많지만 플랫플레이트 슬래브의 취약점인 뚫림전단 파괴에 주의해야 한다. 이에 본 연구에서는 선행으로 실시된 이방향 중공슬래브-기둥 접합부 뚫림전단 성능평가 실험을 바탕으로 하여 경량체가 이방향 중공슬래브-기둥 접합부 뚫림전단 성능에 미치는 영향을 살펴보기 위해 범용 유한요소해석 프로그램인 ABAQUS를 사용하여 경량체량 및 위치를 주요변수로 한 해석적인 변화를 검토하였다. 본 연구를 통해 경량체가 삽입된 이방향 중공슬래브의 뚫림전단 성능에 대해, 해석결과 경량체 량과 위치에 따라 최대 뚫림전단강도는 기준 실험체에 비해 74.3%, 73%의 강도저하를 나타내는 것으로 알 수 있었다. 이는 실험상의 강도저하 값인 84.1%, 56.4%와 다소 차이가 있으며, 해석에서 중공부 주위의 응력집중 현상이 제대로 반영되지 않은 것으로 판단된다. 또한 이방향 슬래브에 경량체를 삽입 할 경우 경량체가 시작하는 부분에서 응력이 급격히 감소하는 현상이 나타났으며, 이러한 급격한 응력감소는 기둥 주위 위험단면의 변화를 가져오는 것으로 추정된다. 즉, 위험단면의 변화는 기둥으로부터 경량체 사이의 거리에 따라 달라지며, 위험단면 내의 콘크리트 단면 손실은 뚫림전단 강도를 감소시킨다. 본 연구에서는 이방향 중공슬래브의 뚫림전단강도를 산정할 수 있는 근사식을 제안하였으며, 보다 정확한 이방향 중공슬래브의 뚫림전단강도의 산정식을 위해서는 위험단면의 변화와 콘크리트 단면손실로 인한 전단강도 저하의 관계에 대한 추가적인 연구가 필요하다.

• Korean Journal of Microbiology
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• v.30 no.6
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• pp.466-471
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• 1992

To determine the site at which -1 ribosomal frameshifting occurs within the gag-pro overlap of HTL V-I. DNA fragment corresponding to a portion of the gene overlap was cloned into a SP6 vector. The resultant plasmid harbors the hybrid gene consisting of a synthetic gene encoding 5 amino acids derived from chick prelysozyme including the initiator methionine plus 141 nucleotides of gag-pro overlapping region followed by Staphylococcus aurcus protein A gene fragment. In vitro transcription by SP6 RNA polymerase with this DNA template made an abundant amount of single species mRNA. Cell-free translation programmed with the RNA transcribed in vitro yielded a polypeptide of 21 kDal in size. which could be purified into homogeneity by IgG-Sepharose affinity chromatography. In vitro system described in this study must be useful for rapid purification and sequencing of the Gag-Pro transframe protein. allowing to determine the exact frameshift site on mRNA and to identify the tRNA involved in frameshifting event for the expression of pro gene.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.43 no.1 s.343
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• pp.71-78
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• 2006

An NoC (Networks-on-Chip) is an emerging design paradigm intended to cope with a future SoC containing numerous built-in cores. In an NoC, the test strategy is very significant for its practicality and feasibility. Among existing test issues, TAM architecture and test scheduling will particularly dominate the overall test performance. In this paper, we address an efficient NoC test scheduling algorithm based on a rectangle packing approach used for an SoC test. In order to adopt the rectangle packing solution as an NoC test scheduling algorithm we design the configuration about test resources and test methods suitable for an NoC structure. Experimental results using some ITC'02 benchmark circuits show the proposed algorithm can reduce the overall test time by up to $55\%$ in comparison with previous works.

• Journal of the Korea Society of Computer and Information
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• v.12 no.6
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• pp.41-48
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• 2007

Since the advent of object-oriented(OO) technology, research and development projects have fumed out that OO technology could importantly contribute in productivity and reusability improvement. There are various research areas related to OO technology And two of major research fields in this areas are concerned in issues for CASE tools and component-based technologies. This paper discusses a trial of applying component-based technology to a CASE tool. This paper proposes the design and implementation issues obtained while we have incrementally developed OODesigner, an OO CASE tool, with compound document support functionality based on COM/OLE technology. As OODesigner with OLE container/server functionality has interoperability with other application programs of Windows system, it can provide more powerful documentation environment than other CASE tools. OODesigner can be used not only to design UML diagrams. but also enables us to make more expressive documentation cooperatively with various kinds of OLE-enabled software like Recorder and Excel. Therefore powerful and consistent documentation activity can be achieved with the tool.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.16 no.10
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• pp.2280-2286
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• 2012

In this paper, we propose a novel nonlinear 3D image correlator using a fast computational integral imaging reconstruction (CIIR) method. In order to implement the fast CIIR method, the magnification process was eliminated. In the proposed correlator, elemental images of the reference and target objects are picked up by lenslet arrays. Using these elemental images, reference and target plane images are reconstructed on the output plane by means of the proposed fast CIIR method. Then, through nonlinear cross-correlations between the reconstructed reference and the target plane images, the pattern recognition can be performed from the correlation outputs. Nonlinear correlation operation can improve the recognition of 3D objects. To show the feasibility of the proposed method, some preliminary experiments are carried out and the results are presented by comparing the conventional method.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2013.10a
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• pp.32-33
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• 2013

In the past, the scenario of VTS simulator was made by instructor's manual operation using waypoint definition of target ship. but in this study, we use automatic scenario creation technology with AIS data and Port-MIS data. The created VTS simaulator scenario also can be modified, added, and saved by instructor's manual operation. VTS simulator display target ship on the Electronic Navigation Chart based on S-57 format. A instructor can easily open this scenario and start, pause, stop operation wirth VTS simulator. A new modification also can be applied immediately to current scenario and can be saved new scenario file. VTS simulator using this technology can create many scenarios for a specific purpose and can be easily used for various application fields.

• 한국HCI학회:학술대회논문집
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• 2007.02b
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• pp.489-496
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• 2007

u-러닝(u-learning) 체제의 도입은, 다양한 형태의 원격교육을 지원하기 위한 교수-학습 시스템 및 모형을 요구하며, 이에 따라 유무선 인터넷을 이용한 u-러닝 시스템이 지속적으로 개발 적용되어 왔다. 하지만, 현재 운영되고 있는 대부분의 원격교육시스템은 교수자와 학습자간의 지속적인 쌍방향 상호작용 유지의 어려움, 시스템 구축을 위한 경제적 부담, 시스템 운영에 투입되는 교수자의 기술적 소양 부족 등의 문제점을 안고 있다. 이러한 문제점을 해결하기 위해서는 다음 항목에 대한 제고가 필요하다. 첫째, 효율적인 쌍방향 상호작용은 학습자 행동에 대한 지속적인 모니터링 및 피드백, 그리고 교수자의 상시 접속 상태 유지를 전제로 한다. 이는 사이버 교사(cyber tutor)를 이용하는 지능형 학습에 대한 논의로 이어진다. 둘째, 구현될 시스템은 경제성과 재사용성 측면이 고려되어야 하며, 이는 기존의 학교 현장의 인프라를 활용하는 u-러닝 개념의 학습 환경, 즉 이동성 네트워크 구조에 대한 설계가 요구된다. 셋째, 시스템의 직접적인 운영 주체인 일선 교사들의 기술적 소양을 고려할 때, 시스템 구축 및 사용상의 편리성, 학습 진행을 위한 보조적 지원 장치 등이 충분히 전제되어야 한다. 이에 본 연구에서는, 이동성과 내재성의 u-러닝 개념을 포함하고, 지능형 가상 교수자(cyber tutor)에 의한 블랜디드 학습(blended learning)을 도입하며, 사용자의 기술적, 경제적 부담의 제거가 가능한 지능형 u-러닝시스템을 개발하였다. 본 연구에 의해 개발된 시스템은 기존의 네트워크 인프라와 u-러닝의 개념을 통합하는 네트워크 구조, 원격학습을 지원하는 네트워크 화이트보드, 학습 과정의 저장과 해석을 지원하는 스크립트 인터프리터, 학습자 반응에 대한 피드백을 자동 제공할 수 있는 지능형 인터프리터로 구성되었다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.33 no.4A
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• pp.335-341
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• 2008

The SDR(Software Defined Radio) system for hardware and software must be an open structure to various system standards. It should also provide a capability of distributed processing, object-orientedness, and software controllability. It implies that the software to be used in the SDR system should provide the openness such that it can operate independently of a given hardware platform. In order to achieve these goals, the SDR system tends to modularization for increasing hardware reuse and design flexibility, which provides the system reconfigurability. In this paper, we implemented a base station with proposed an open architecture of a Smart Antenna Base Station(SABS) and Smart Antenna APIs[10] operating in SDR network in such a way that the architecture itself is suitable for the entire system to maintain the openness, object-orientedness, and software controllability.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39A no.1
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• pp.1-11
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• 2014

In this paper we propose a system for vehicle detection and tracking which has the ability to learn on-line appearance changes of vehicles being tracked. The proposed system uses feature-based tracking method to estimate rapidly and robustly the motion of the newly detected vehicles between consecutive frames. Simultaneously, the system trains an online vehicle detector for the tracked vehicles. If the tracker fails, it is re-initialized by the detection of the online vehicle detector. An improved vehicle appearance model update rule is presented to increase a tracking performance and a speed of the proposed system. Performance of the proposed system is evaluated on the dataset acquired on various driving environment. In particular, the experimental results proved that the performance of the vehicle tracking is significantly improved under bad conditions such as entering a tunnel and passing rain.

• Journal of the Korean Recycled Construction Resources Institute
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• v.4 no.1
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• pp.1-9
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• 2016

While the amount of construction waste has not been changed much in discharge for last 10 years, the recycled resources refined from construction waste have been mainly applied to low-leveled one such as reclamation, back-fill, road base or subbase and so on. Thus this study addresses the applicability of recycled fine aggregate as a replaceable material in precast concrete. To evaluate the possibility, both of dry and wet processes were adopted as well as steam curing, widely used in the field for rapid producing. Most important experimental parameters were driven through preliminary experiments and were evaluated in terms of concrete properties. It is found from aggregate-replacement tests that all of consistency and strengths of concrete were decreased as the ratio of recycled fine aggregate increased, and the amount of decrease can be estimated using proposed equations. Though the recycled fine aggregate showed a decrease of concrete properties more or less, the applicability in large volume as a constituent of precast product was well noted from experimental results.