• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2008년도 추계학술발표대회
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• pp.1280-1283
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• 2008

MOG(Multiplayer Online Game)의 네트워크 성능은 네트워크 부하량과 사용자의 입력에 대한 반응속도로 측정 가능하다. 본 논문은 MOG의 일종인 실시간 전략 시뮬레이션 분야에서 게임 동기화에 이용되는 프레임 잠금(frame lock) 알고리즘과 게임 턴(game turn) 알고리즘을 소개하고 그 성능을 평가한 결과를 제시한다. 또한 동기화 알고리즘들을 쉽게 교체하여 효율적인 평가를 진행할 수 있는 MOG 서버 구조도 제시한다.

• 디지털콘텐츠학회 논문지
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• 제7권2호
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• pp.117-124
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• 2006

본 본문에서는 사용자가 유비쿼터스 흠 네트워크 환경에서 장소를 이동하면서도 끊김없이 연속적인 멀티미디어 컨텐츠 스트림 서비스를 제공받을 수 있는 시스템을 구현하였다. 기존의 멀티미디어 스트리밍 서비스는 사용자를 인식하지 못하고 항상 새로운 세션이 생성됨에 따라 사용자가 기존에 제공받던 멀티미디어를 이어서 보고자 할 때 그 프레임위치를 기억해 놓고 상태바를 재설정 해 주어야하는 불편함이 있었다. 이에 본 연구에서는 위치인식시스템을 사용하여 사용자의 위치를 인식하고 사용자의 이동성을 지원하여 개인의 상황(사용자의 위치, 사용자와 가까운 단말기, 기존에 제공받던 미디어를 이어서 전송받기를 원하는지 여부 등)을 고려한 위치인식을 통한 개인화된 멀티미디어 스트리밍 시스템을 제안하고 구현하였다.

• 한국보육지원학회지
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• 제7권3호
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• pp.143-164
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• 2011

본 연구는 자연친화적 실외 환경에서의 놀이에 나타난 영아들의 경험 세계를 살펴, 그 의미를 도출해 보고 영아를 위한 자연친화적 실외놀이의 활성화 방안을 모색해 보는 계기를 마련하고자 하였다. 이를 위해 연구자는 부산시 동구에 위치한 S어린이집의 별님반과 꽃들반에 재원중인 22개월에서 33개월 사이의 영아 9명을 대상으로 영아들의 실외놀이를 참여관찰하고 원장, 교사와의 심층면담, 그리고 중요한 기록물들에 대한 분석을 포함한 질적 연구방법을 실시하였다. 본 연구의 결과, 영아들에게 자연친화적 실외 환경에서의 놀이 경험은 영아가 보육기관의 실내 공간에서는 제한 받았던 특별하고 다양한 경험 세계를 제공하고 있음을 알 수 있었다. 구체적으로는 첫째, 영아들은 '감각을 깨우는 탐색의 세계'를 경험하고 있었으며 둘째, '정서를 깨우는 소통의 세계'를 경험하고 있었다. 영아가 놀이 경험을 통해 보다 건강한 성장을 한다고 볼 때, 자연친화적 실외 환경은 오늘날 전형적인 인공 놀이터의 틀을 깨고 찾아가기에 충분한 가치를 지닌, 온전하고도 생기 넘치는 살아있는 놀이터라는 점과 영아들이 이러한 공간에서 깊이 몰입하여 놀이를 경험할 수 있도록 충분한 시간을 제공하는 방안이 모색되어야 한다는 점이 제안되었다.

• 한국조경학회지
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• 제34권4호
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• pp.18-36
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• 2006

The purpose of this research was to establish a green-networks from the perfective of landscape ecology in order to improve the function of urban green spaces. The study site was Dalsu-Gu in Daegu City. This research consisted of three phases. In the first phase, field surveys were carried out in order to understand existing distribution pattern of green spaces in the study site. 533 green spaces surveyed in the first phase were classified into 7 patterns and 24 types. The total area of the green spaces in Dalsu-gu was 3,329ha. Specifically the area of the 'urban nature parks' type was 57.49% of the total area of green spaces in Dalsu-gu, and it was expected that 'urban nature parks' type can play important roles in the green-networks in Dalsu-gu. Two analysis with green spaces in 9 types including 'urban nature parks', 'rivers' and 'neighborhood parks' were performed to establish a basic network frame of the green-networks. In the second phase, 'mutual connectivity analysis' and 'mutual matrix analysis' were performed to select core green spaces of a green-networks using 'areas of each green space and a distance between each space' and 'a rate of green spaces and a rate of water permeable pavement'. The results of the second phase indicated that, in mutual connectivity analysis, large green spaces apart from each other were evaluated as having higher mutual connectivity than small green spaces near to each other. In mutual matrix analysis, the green spaces with higher mutual connectivity and the small green spaces near to each other were evaluated as having better mutual matrix. In the last phase, we structured a basic frame of the green-networks in Dalsu-Gu. The results suggested that the basic frame of the green-networks in Dalsu-Gu was composed on four green-network axes and its shape mirrored a cruciform(+) of northwest${\longleftrightarrow}$southeast directions and southwest${\longleftrightarrow}$northeast directions, The Duryu neighborhood park is at the central point of this green-networks.

• 한국지진공학회논문집
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• 제11권5호
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• pp.1-9
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• 2007

본 논문에서는 철근콘크리트 모멘트 골조의 보-기둥 접합부에 대한 비탄성 회전 능력의 성능을 조사한 연구 결과를 하고 있다. 총 91개의 보-기둥 접합부 실험체에 대해 상세히 조사되었으며, 그 중 28개의 실험체는 ACI 318-02의 상세 요구에 기초하여 특수 모멘트 골조 접합부로서 분류되었다. AISC-97 내진 기준에서 철골 모멘트 골조 접합부를 위해 정의된 허용기준이 분류된 철근콘크리트 모멘트 골조의 접합부에 대해 평가하기 위해서 사용되었다. 특수 모멘트 골조 접합부에 대한 설계 상세를 만족하는 28개의 실험체 중 27개의 특수 모멘트 골조 접합부가 충분한 강도를 가지고 있었으며, 급격한 강도 감소 없이 0.03 rad.의 소성 회전에 대해 연성 거동을 발휘할 수 있음을 보여 주었다. 접합부의 전단 강도, 기둥과 보에 대한 휨 강도 비율, 접합부내에서의 횡방향 철근비 등에 대한 제한이 보-기둥 접합부의 만족스런 내진 성능을 보여주는데 중요한 역할을 하였다.

• Structural Engineering and Mechanics
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• 제47권1호
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• pp.59-73
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• 2013

The Xiaolan channel super large bridge is unique in style and with greatest span in the world with a total length of 7686.57 m. The main bridge with spans arranged as 100m+220m+100m is a combined structure composed of prestressed concrete V-shape rigid frame and concrete-filled steel tubular flexible arch. First of all, the author compiles APDL command flow program by using the unit birth-death technique and establishes simulation calculation model in the whole construction process. The creep characteristics of concrete are also taken into account. The force ratio of the suspender, arch and beam is discussed. The authors conduct studies on the three-plate webs's rule of shear stress distribution, the box girder's longitudinal bending normal stress on every construction stage, meanwhile the distribution law of longitudinal bending normal stress and transverse bending normal stress of completed bridge's box girder. Results show that, as a new combined bridge, it is featured by: Girder and arch resist forces together; Moment effects of the structure are mainly presented as compressed arch and tensioned girder; The bridge type brings the girder and arch on resisting forces into full play; Great in vertical stiffness and slender in appearance.

• Journal of Cardiovascular Imaging
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• 제30권4호
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• pp.292-304
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• 2022

BACKGROUND: Calcium is a determinant of paravalvular leakage (PVL) after transcatheter aortic valve implantation (TAVI). This is based on a fixed contrast attenuation value while X-ray attenuation is patient-dependent and without considering frame expansion and PVL location. We examined the role of calcium in (site-specific) PVL after TAVI using a patient-specific contrast attenuation coefficient combined with frame expansion. METHODS: 57 patients were included with baseline CT, post-TAVI transthoracic echocardiography and rotational angiography (R-angio). Calcium load was assessed using a patient-specific contrast attenuation coefficient. Baseline CT and post-TAVI R-angio were fused to assess frame expansion. PVL was assessed by a core lab. RESULTS: Overall, the highest calcium load was at the non-coronary-cusp-region (NCR, 436 mm³) vs. the right-coronary-cusp-region (RCR, 233 mm³) and the left-coronary-cusp-region (LCR, 244 mm³), p < 0.001. Calcium load was higher in patients with vs. without PVL (1,137 vs. 742 mm³, p = 0.012) and was an independent predictor of PVL (odds ratio, 4.83, p = 0.004). PVL was seen most often in the LCR (39% vs. 21% [RCR] and 19% [NCR]). The degree of frame expansion was 71% at the NCR, 70% at the RCR and 74% at the LCR without difference between patients with or without PVL. CONCLUSIONS: Calcium load was higher in patients with PVL and was an independent predictor of PVL. While calcium was predominantly seen at the NCR, PVL was most often at the LCR. These findings indicate that in addition to calcium, specific anatomic features play a role in PVL after TAVI.

• 한국실내디자인학회논문집
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• 제16호
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• pp.175-181
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• 1998

The purpose of this study was to analyze the characteristics of expression and formal principle of universalism in Architectural Composition. Theorical category is to find universal system with the connection between idea of society and tradition in compositional frame the results were as follows : First it is the pursuit of divine. Through Middle Age and Renaissance universalism of principles in Architectural Composition is appeared a numerical order and human proportion with applying of cosmology. Second it is the pursuit of schema. With the simplicity of formal image it represented to the geometrical form for its clearness. Third it is the pursuit of typology. As to play a role of decisive factor in formal construction type represented the model with abstraction of shape.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 추계종합학술대회 논문집(1)
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• pp.109-112
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• 2000

The satellite communications are expected to play an important role to provide broadband multimedia services in the 21st century. According to this requirements, this paper describes the design and implementation of ATM-based high speed satellite modem ASIC chipset. The ASIC chip consists of three main parts, CODEC, Modulator and Demodulator. It supports burst and continuous mode operation with TDMA frame consisted of Reference bursts, Inbound burst, and Traffic burst. The maximum transmission rate is OC-3 (155Mbps) and the maximum operating clock speed is 220MHz. This ASIC chip was implemented with 0.25um CMOS technology.

• 한국통신학회논문지
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• 제22권6호
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• pp.1377-1384
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• 1997

We propose a new scheme to provide the fast forward and reverse(FF/R) functions to users in Video On Demand Service System. The proposed scheme is to use only I and P pictures obtained by sampling MPEG2 bit-steam. New frame raes for FF/R play are specified with parameters of MPEG2 syntrx. Bits of I and P pictures are reduced in three steps: Variable length decoding(VLD), Inverse quantization and Requantization. The proposed scheme is ecnomical in the sense that it can provide FF/R function without any additional requirement on the bandwidth and on the storage media in video server.