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가상 건축 엔지니어링 응용을 위한 네트워크 공유작업 엔진의 구현
송경준,고동일,김종성,맹성현,Song, Gyeong-Jun,Go, Dong-Il,Kim, Jong-Seong,Maeng, Seong-Hyeon 한국정보과학회 2001 정보과학회논문지 : 시스템 및 이론 Vol.28 No.12
웹의 보급과 이에 따른 인터넷의 폭발적 확산은 컴퓨터와 네트워크를 핵심 매개로 하는 공동작업과 이에 따른 공동 문제해결의 출현을 가능하게 했으며 3차원 그래픽 기술의 발달과 함께 3차원 가상환경을 바탕으로 한 공동작업 응용이 출현하였다. 가상 건축 엔지니어링은 이런 3차원 가상환경 기반 공동작업 응용의 하나로 여러 설계자가 설계한 건축 설계 도면을 가상 공간에서 미리 통합하여 실현함으로써 발생할수 있는 오류를 사전에 발견하여 인적, 물적, 시간적 낭비를 막는 것을 그 목적으로 한다. 이 논문에서는 가상 건축 엔지니어링 응용을 제작하는데 고려해야 할 문제점을 정의하고 이를 해결하기 위해 구현된 Share 협동작업 엔진에 대해 설명한다. Share 협동작업 엔진은 새로운 Share 분산 네트워크 구조를 제안하여 네트워크 참여 개체를 관리하여 가상공동작업의 3차원 객체의 실시간 동기화를 지원하며, 파라메터기반 3차원 가상 객체 표현 기술을 이용하여 네트워크 대역폭 사용을 최소화하여 확장성을 향상시킨다. 또한 본 논문에서는 이를 바탕으로 실제로 제작된 가상 건축 엔지니어링 2000 (VAE2000) 서비스에 대해 설명하며 시뮬레이션과 실제 시연을 통해 이의 유용성을 증명한다. Recently, the advent of World-Wide-Web(WWW) and the explosive popularity of the Internet gave birth to collaborative applications which were enabled by computers and networks as their primary media. The progress of 3D computer graphics enabled collaborative application with 3D virtual environments or distributed virtual environments. In this paper, we explain our implementation of the Share collaboration engine which is for collaboration applications based on a distributed virtual environment. We introduce Virtual Architectural Engineering 2000 (VAE2000) that is our pilot application implemented with the Share collaboration engine. The Share collaboration engine proposes a new Share network architecture for management of participants, and it provides some synchronization methods for 3D objects in virtual collaboration. VAE2000 is an experimental application that tries to prevent wastes of human, material and time resources in networked virtual collaboration.
송경준,천성빈,신중호,이중의,서길준,윤여규 대한응급의학회 2003 대한응급의학회지 Vol.14 No.1
Purpose: There is a continuing debate about whether small bowel obstruction (SBO) is best managed operatively or nonoperatively. There is also no definite criteria for physician to decide to operate patient with SBO. This retrospective study was designed to determine the factors influencing the treatment modality of SBO. Methods: A clinical analysis was applied to 95 patients with SBO who were admitted to the emergency department of Seoul National University Hospital from January, 2000 to December, 2001. The patients were divided into the operative and non-operative treatment groups according to the treatment modality. We compared parameters such as age, sex, the etiology of SBO, the history of previous SBO, the history of previous operation due to SBO, time period from onset of symptoms to admission, and symptoms and signs between two groups. Results: Among 95 cases, the operative management was performed in 21 cases and the non-operative treatment in 74 cases. There was no significant difference in the distribution of age and sex between two groups. The most common etiology of SBO was adhesion due to previous operation. In the operative treatment group, 12 (57.1%) cases had the history of previous operation because of SBO, which showed a significant difference compared to the nonoperative treatment group (p<0.001). The major symptoms and signs were abdominal pain, vomiting, abdominal tenderness, hyperperistalsis, leukocytosis, tachycardia, rebound tenderness and fever. Of these symptoms and signs, rebound tenderness was only more common in the operative group than in the non-operative group (p<0.001). Conclusion: At the time of admission to the emergency department, the rebound tenderness in patients with SBO is an important factor to consider the early operative intervention.