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변재영 대한영상의학회 1990 대한영상의학회지 Vol.26 No.2
Hemangiomas of the gastrointestinal tract are rare lesions, and hemangiomas of the esophagus are extremely rare. Govoni, reviewing the literature until 1982, found only 57 cases of hemangiomas of the esophagus. We report a case of esophageal cavernous hemagioma found in a 41-year-old Korean man who had occasional dysphagia and therapeutic approach are reviewed and discussed.
소규모 전문박물관의 전시연출에 관한 연구 -선거박물관 건립계획을 중심으로-
변재영 한국문화공간건축학회 2010 한국문화공간건축학회논문집 Vol.- No.31
In the past two decades, museums have seen rapid changes in terms of the application of information technology, which has been used to represent their collections in new ways. In recent years, the rapid growth of small scale specialized museum has become a serious concern for museum visitors and designers. A museum is a building or institution which houses and cares for a collection of artifacts and other objects of scientific, artistic, or historical importance and makes them available for public viewing through exhibits that may be permanent or temporary. New technologies are beginning to cause significant changes in the way museums perform their functions and in the way they are perceived by the public. The paradigm of museums shifts from artifact-centered to experience-centered. Museums have recently developed a strong interest in technology, as they are more than ever before in the orbit of cultural industries. They look at technology as a possible partner which can help archive a balance between culture and education as well as help them be more effective in conveying story and meaning. This study explores the theory of preliminary planning for the Museum of Elections which will be built in next few years, and deals with preliminary studies such as the definition and function of a specialized museum, changes on museums according to the times, changes in the paradigms of museums, the meaning, characteristics, technology etc, in order to establish an understanding of small scale specialized museums and technologies such as interactive media.
IEEE 802.11에서 멀티미디어 QoS 보장을 위한 무선 측정 기반 TFRC 기법
변재영,Pyun Jae young 한국통신학회 2005 韓國通信學會論文誌 Vol.30 No.4B
본 논문에서는 first-hop 무선 채널을 갖는 무-유선망에서 채널 특성에 따라 코딩 비트율을 조절할 수 있는 동적 TCP-friendly 비트율 제어방식 (TFRC)을 제안한다. 제안되는 비트율 제어 기법은 무선망을 통해 전송되는 멀티미디어 플로우의 QoS 성능 저하 현상을 피하기 위해 패킷 손실 통계자료를 이용한 새로운 무선 손실 구별 알고리즘을 사용하고 있다. 이 알고리즘은 무-유선망에서 TCP 플로우와 함께 백본 대역폭을 공유하는 동안 TCP-friendly하도록 비트율을 생성한다. 실험 결과를 통해 제안하는 비트율 제어방식의 시스템은 TFRC 흐름 제어에서 무선 손실의 영향을 제거하고 신뢰성이 낮은 무선 링크에 의해서 발생되는 비디오 스트림의 갑작스런 품질 저하 현상을 상당히 줄일 수 있음을 알 수 있다. In this paper, a dynamic TCP-friendly rate control (TFRC) is proposed to adjust the coding rates according to the channel characteristics of the wireless-to-wired network consisting of wireless first-hop channel. To avoid the throughput degradation of multimedia flows traveling through wireless lint the proposed rate control system employs a new wireless loss differentiation algorithm (LDA) using packet loss statistics. This method can produce the TCP-friendly rates while sharing the backbone bandwidth with TCP flows over the wireless-to-wired network. Experimental results show that the proposed rate control system can eliminate the effect of wireless losses in flow control of TFRC and substantially reduce the abrupt quality degradation of the video streaming caused by the unreliable wireless link status.
Fundamental Behavior Analysis of SCM440 Steel on Friction and Wear
변재영,이창주,장준수,최원식 한국기계가공학회 2016 한국기계가공학회지 Vol.15 No.1
Due to the increased use of power caused by industrial development, the importance of improving wear and friction in the contact region has emerged. Except for some parts, such as brakes or clutches and friction, seals and precision mechanical parts (e.g., pistons, bearings, valves, and cams) are important engine components that require low friction characteristics. In this study, the experimental method used to determine the friction characteristics was based on the type of rpm with the pin-on-disc test device, the element analysis program ANSYS was used to analyze the surfaces of the two metals rubbing together, and physical formation FEM models were used to study the properties and wear. The friction coefficient of variation was unsafe, but at the start of wear, it converged to a stable friction coefficient that increased after a certain slip away.