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박동원,Park, Dong-Won 배재대학교 자연과학연구소 1995 自然科學論文集 Vol.7 No.-
실 시간 처리 시스템에서의 시간제약 조건을 충족시키는 바람직한 수단으로 근사값 계산 방안이 제안되었지만, 이에 대한 근본적 이론연구는 깊이 고찰되어 있지 않은 형편이다. 이에 본 논문에서는 실제 응용그로그램에서의 근사값 계산 방안의 체택 당위성을 판단할 수 있는 이론적 결정 방법을 제시하였다. 이로써 실시간에서의 시스템 예측도와 대응능력을 높여, 효과적인 자원관리와 제약조건을 충족시킬 수 있도록 한다. Imprecise computation has been suggested as a promising model of real-time computing in order to deal with timing constraints imposed by the environment. However, the theoretical foundation of the technique has not been fully explored. To address this, a decision-theoretic foundation of imprecise computation is proposed. The main benefit of such a treatment is that it enables the qualitative assumptions underlying imprecise computation techniques to be explicitly stated in a formal way. The theoretical foundation laid out in this paper, hence, will not only enable the justification of using imprecise computation techniques for a real-time application, but will also facilitate the development of extended techniques for more complexs real-time systems.
박동원,안성옥,Park, Dong-Won,Ahn, Sung-Og 배재대학교 공학연구소 1997 공학논문집 Vol.2 No.1
실시간 분산처리 시스템 개발을 위한 설계 동향을 분석한 바, 기존의 실시간 분산처리 시스템은 통신, 근사치 계산, 객체지향 패러다임, 멀티프로세서 하드웨어, 동적 시간 처리 및 에러 용인 등의 특성을 반영하여 설계되고 있다. 이러한 주요 설계 요소들의 장점, 단점을 분석하여 차세대 실시간 시스템 개발을 위한 방안을 논의하였다. In this paper, we examine design trends in the development of distributed real-time system. Many real-time systems developed over the last ten years share common characteristics including use of communications, imprecise computations, the object-oriented paradigm, multiprocessor node hardware, dynamic time-driven scheduling and the inclusion of fault tolerance mechanisms. By examining the major design decisions made in previous systems, the best attributes of these systems can be coalesced together to form the "ideal" real-time system. This paper examines such a system and the advantages and disadvantages of the design decisions involved.
박동원,마밍,안성옥,Kulwinder Singh 한국컴퓨터교육학회 2005 컴퓨터교육학회 논문지 Vol.8 No.1
In this paper we present a novel approach for image retrieval using color and edge information. We take into account the HSI (Hue, Saturation and Intensity) color space instead of RGB space, which emphasizes more on visual perception. In our system colors in an image are clustered into a small number of representative colors. The color feature descriptor consists of the representative colors and their percentages in the image. An improved cumulative color histogram distance measure is defined for this descriptor. And also, we have developed an efficient edge detection technique as an optional feature to our retrieval system in order to surmount the weakness of color feature. During the query processing, both the features (color, edge information) could be integrated for image retrieval as well as a standalone entity, by specifying it in a certain proportion. The content-based retrieval system is tested to be effective in terms of retrieval and scalability through experimental results and precision-recall analysis. 본 논문에서는 칼라와 에지 정보를 이용한 내용기반 영상검색 기법을 제안하였다.기존의 RGB 공간 정보를 이용하기 보다는,시각적 인식에 보다 중점을 둔 HSI칼라 공간에서 고찰하였다. 비슷한 류의 색을 대표색으로 통합 표현하여, 개선된 칼라 정보 이용법을 본 연구에서 제안하였다. 또한 칼라 정보만을 이용했을 때의 시스템 성능상의 결점을 보완하기 위하여, 효율적인 에지 디텍션 기법을 함께 사용하였다. 칼라와 에지 기법을 통합함에 있어서, 각각의 기법에 적절한 가중치를 배분함으로써 시스템 성능을 실험적으로 향상시켰다.
박동원,장수일,Park, Dong-Weon,Chang, Soo-Il 대한소아외과학회 1997 소아외과 Vol.3 No.2
Appendiceal perforation is uncommon in the neonate. Diess reported the first case in 1908. Approximately 111 additional cases have been reported since that time. However, with exclusion of neonatal appendicitis associated with inguinal or umbilical hernias, necrotizing enterocolitis, meconium plug, and Hirschsprung's disease, there are only 36 cases of primary neonatal appendicitis. We treated a 12 days old boy with perforation of the appendix. The infant was 3000 g at birth and had a normal spontaneous vaginal delivary at 35 weeks of gestation. The mother was 31-year-old and had premature rupture of membrane. After normal feeding for the first 5 days of life, the infant had emesis of undigested milk, decreased activity and jaundice. The baby was admitted to the Pediatrics. Progressive abdominal distension, fever, decreased activity, and vomitting developed over the next six days. Erect abdominal radiography showed pneumoperitoneum. At exploratory laparotomy, a $0.8{\times}0.6$ cm sized perforation was noted at antime-senteric border of midportion of the appendix. Trasmural inflammation and the presence of ganglion cells were noticed on histology.
한계전류형 YSZ 산소센서의 산소감응 특성에 미치는 고체전해질 결정성 및 확산장벽 두께의 영향
박동원,김대용,이동림 대한금속재료학회(대한금속학회) 1997 대한금속·재료학회지 Vol.35 No.3
The limiting current type oxygen sensor is known for excellent characteristics at the low temperatures and throughout the wide oxygen concentration range. In this study, 3 ㏖% Y₂O₃ doped poly-crystal and 15 ㏖% Y₂O₃ doped single-crystal zirconia were used as the solid electrolyte of limiting current type oxygen sensors. The limiting current of the sensor using polycrystalline YSZ was observed over the oxygen concentration range of up to 62.5% and at a temperature range of 560℃∼720℃ in O₂-N₂ mixtures. The sensor using single crystal-YSZ had lower operating voltage than the sensor with polycrystalline YSZ probably due to its low electrolytic resistance.
박동원,이성식,최대웅,신군섭 한국공업화학회 1998 응용화학 Vol.2 No.1
Extraction by hollow fibers are fast compared with conventional extractional equipment because of the large surface area per volume, and the feeds can be contacted at high speed and two flows are completely independent, so there no problems withlaoding, flooding and channeling. In this paper, it was investigated the flow rate of aqueous and organic solution by using the hollow fiber membrane. It is known that the mass transfer is done as the flow rate of aqueous phase increase. For the system with high distribution ratio, effect of the distribution ratio on mass transfer was weak in system in the hollow fiber membrane.