IEEE 1394 Device 기반의 멀티미디어 서비스 환경 동향 분석

송정환,김광훈 경기대학교 1999 論文集 Vol.43 No.2

최근 반도체 기술의 발달과 컴퓨터 및 통신기술의 향상으로 주변의 TV, Audio, Video를 일컫는 일반 가전제품들이 점차적으로 사라지고 모든 기능이 컴퓨터와 결합된 새로운 형태의 다양한 멀티미디어 제품들이 안방은 물론, 사무실까지 점차적으로 차지하고 있다. 특히, 국제적 표준 기술을 바탕으로 주변기기간의 초고속의 데이터 전송을 가능하게 하는 IEEE 1394 Device의 등장은 이러한 일반가전제품과 컴퓨터와의 통합을 활성화시키는 계기가 되었다. 국내에서의 연구 및 개발 상황은 아직 미흡하지만 몇몇의 주요 가전 및 컴퓨터 제품 제작회사들을 중심으로 그에 대한 관심과 준비가 서서히 일어나고 있다. 본 논문에서는 IEEE 1394 Device 기반 기술에 대한 연구 및 개발 내용을 알아봄으로써 이와 관련된 멀티미디어 서비스 기술은 어떠한 방향으로 진전될 것이며, 그에 대한 한국의 대응방안은 어떻게 진전되고 있는가를 멀티미디어 서비스 환경을 중심으로 분석하였다.

좌심방에 발생한 원발성 미분류 방추세포 육종 1례

조정환,홍그루,송인욱,손창우,정선영,남종호,김미진 영남대학교 의과대학 2009 Yeungnam University Journal of Medicine Vol.26 No.2

八味地黃湯 煎湯液의 投與가 마우스의 自然致死 細胞의 活性度 및 免疫反應에 미치는 影響

朱松竹,李彦政,吳昇煥 圓光大學校 韓醫學硏究所 1992 원광한의학 Vol.2 No.1

This study was done to know the effects of Palmijihwangtang(八味地黃湯) on the cytotoxic activity of NK cells, the phagocytic activity of macrophages, the antibody production of B cells, and delayed-type hypersensitivity reaction by T cells in the mouse. The results were as follows. 1. The administration of Palmijihwangtang enhanced the cytotoxic activity of NK cells against YAC-1 cells. 2. The administration on Palmijihwangtang increased the production of reactive oxygen intermediate(ROI) production from macrophages without any effect on phagocytic activity. 3. The administration of Palmijihwangtang decreased the delayed-type hypersensitivity against dinitrochlorobenzene without affecting T cell subtypes. 4. The administration of Palmijihwangtang increased the antibody production against sheep red blood cells. The above results suggest that Palmijihwangtang could be used for the prevention and treatment of the diseases caused by the abnormalties of the body's immune functions.

토끼에서 Etofenprox와 Spinosad 합제의 국소자극성 시험

황윤환,김명석,송인배,박병권,양승호,임용현,송치용,안성한,남현수,임정교,정상일,명노일,윤효인 忠南大學校 獸醫科大學 附設 動物醫科學硏究所 2008 動物醫科學硏究誌 Vol.15 No.1

This study was performed to evaluation the skin and eye irritation of etofenprox 8% and spinosad 4% combination in male New Zealand White rabbits. In skin irritation test, the combination of etofenprox and spinosad did not showed any change of body weight but caused slight skin irritation with the P.I.I. (primary irritation index) value 0.25. The etofenprox and spinosad combination showed severe eye irritation 1 h, 24 h, 48 h, and 72 h after ocular treatment, having the A.O.I. (acute ocular irritation) value of 37.3. Therefore, these result indicated that the combination of etofenprox and spinosad might be irritant formulation on eye and skin.

個人所藏 銀製葡萄獸禽文小甁에 관한 硏究

서정호,송현정,김대환 공주대학교 문화재보존과학연구소 2004 문화재과학기술 Vol.3 No.1

銀製葡萄獸禽文小甁 新例는 통일신라의 대표적인 문양으로 구성된 것이며, 그 제작기법이 우수하고 예술성도 뛰어나 금속세공기술 연구에 있어서 중요한 자료이다. 또한 출토사례가 많지 않아 매우 희귀한 예라고 할 수 있다. 이 병은 개인 소장품으로 출토당시부터 어깨부 한쪽이 부식되어 박락되어 있었다. 장기 보존을 위해서나 전시를 위해서는 추가 부식을 방지하기 위한 保存方案이 필요하다. 유물의 내부구조와 상태를 파악한 후에 유물이 최대한 원형을 유지할 수 있도록 적절한 처리가 이루어져야 할 것이다. The new case of Silver Bottle is composed of representative design of Unified Silla, and because the production technique is superior and the artistic as well, it is the important material for the study of metalwork technique. And it is the rare case, for there aren‘t many excavated cases. This bottle is personal possession and one side of shoulder is corroded and exfoliated at the time of excavation. For the long-term preservation or display, conservation method which prevents additional corrosion is needed. After catching the inner structure and state, proper treatment should be done in order that remains can retain its original form.

선형 및 비선형 초음파를 이용한 1Cr-1Mo-0.25V의 열화평가에 관한 연구

김정표,석창성,송성진,김영환 한국비파괴검사학회 2001 한국비파괴검사학회지 Vol.21 No.5

초음파법은 산업설비의 열화 정도나 결함을 평가하기 용이한 비파괴적 방법이다. 본 연구에서는 1Cr-1Mo-0.25V을 630°C에서 등온열화처리하여 4개의 시편을 준비하였다. 이를 사용하여 초음파의 속도, 감쇠계수를 측정하여 재료의 열화를 평가하였으며, 배진동의 발생효률을 나타내는 비선형파라미터를 이용하여 재료의 열화정도를 평가하였다. 감쇠계수와 비선형파라미터는 열화가 진행될수록 증가하였으며, 특히 1,820 시간 열화시편의 배진동 진폭은 원시시편의 배진동 진폭과 비교시 20dB이상 증가하였다. 그러나 열화정도에 따른 속도의 변화는 거의 없는 것으로 나타났다. 본 연구결과에서 감쇠계수와 비손형파라미터는 재질 열화에 민감하게 반응하는 파라미터였으며, 재질 열화도를 평가하기에 적절한 파라미터인 것으로 사료된다. Ultrasonic is a powerful nondestructive technique for getting the information of flaws and material properties of in-services facilities. We prepared 4 different 1Cr-1Mo-0.25V specimens by isothermal aging at 630°C. We evaluated material degradation using ultrasonic parameters, velocity, attenuation and harmonic generation. Attenuation and nonlinear parameter derived from harmonic generation efficiency increased as degradation. Especially the second harmonic of the fundamental wave in the 1,820 h aging material was observed to exceed 20 dB more than that in the un-aged material. But velocity remained virtually the same for all specimens. We concluded that nonlinear parameter and attenuation are sensitive to material degradation, but velocity was not. It'll be a good parameter for evaluating the material degradation.

차체용 드로우 다이의 블랭크 홀더 굽힘 변형 해석

인정제,신용승,김헌영,김재우,송명환,박진수 한국공작기계학회 2000 한국공작기계학회 추계학술대회논문집 Vol.2000 No.-

The contact forces between die components for the drawing of large size automotive panels introduce elastic deflections of the die components. Due to the deflections, the gap between blank holder and die varies locally resulting in nonuniform material flow. Such a nonuniform die gap usually requires correcting operation, so called die spotting, which is time consuming trial and error process. To reduce the die spotting time, the optimization of the blank holder bending deflection is needed. In this paper, we implemented an analysis procedure to predict the blank holder deflection. The analysis procedure and design of experiments techniques are applied to the optimization of balance block heights. The optimization results can be used as guidelines in actual die spotting process.

FEM을 이용한 선삭가공 절삭조건의 영향 분석

임세환,송춘삼,홍석관,강정진,김주현 한국공작기계학회 2007 한국공작기계학회 추계학술대회논문집 Vol.2007 No.-

A plane strain finite element model is developed to simulate turning with continuous chip formation using adaptive remeshing during the thermal-mechanical coupled analysis. Comparisons between the experimental and simulation results for cutting forces are performed to validate FE analysis results. Influences of machining parameters such as depth of cut, cutting speed and feed rate on cuting force and shear angle are analyzed by Taguchi method. The more depth of cut and feed rate result in the increase of cutting forces, but the rates of increase are decrease due to the larger shear angle. As the cutting speed increases, von Mises stress of workpiece near the tool tip decreases because the strength of specimen decreases at high temperature above 500℃. This thermal effect on cutting force is negligible because the affected area is very localized and the average values of von Mises stress in the shear plane are the same among the diverse cutting parameters.

부유대역 용융응고법으로 제조된 YBa_2Cu_3O_x 산화물초전도체의 미세구조와 전기적 특성

노태형,송정환,장규철,한이섭,김소정,구본급,김호기 대전산업대학교 반도체기술연구소 2000 半導體技術硏究所報 Vol.2 No.-

The YBa_2Cu_3O_x-20 wt% Y_2BaCuO_5 composition designed in YBCO system was synthesized by solid state reaction method. The optimum condition of hot zone temperature and growth rate in floating-zone melt were 1080 ℃ and 2.5 mm/hour, respectively. In samples growth as these condition, the low angel boundaries in grain direction and small amount of amorphous phase known as decreasing characteristics of superconducting materials between grain boundaries in microstructure are investigated by polarized light microscopy on the whole. The critical current density(Jc) at 77k of sample using powder fabricated with no CeO_2 and doped 5 wt%CeO_2 were 8,000 A/㎠(Jc : 561A) and 12,000 A/㎠(Jc: 826A) at 0 T by direct current transport method, respectively.

서식지 단편화에 의한 야생동물의 차량충돌 피해

김우룡,안현철,송재철,이정환 진주산업대학교 농업기술연구소 2001 農業技術硏究所報 Vol.14 No.-

This study was focused on the damage and fragmentation of habitat of human activities and roadkill of animals by vehicles in the Gyeongsangnam-do Province. The goal of the Eco-bridge project is to maintain a nearly contiguous green network for wildlife. Because of existing roadways, dam, cities, farm land, recreation and leisure town, etc. in the habitat are divided into some patches. Before the construction of Ecobridge, we must know to the states of wild animals in which distribution, damage, roadkill and reserve area, etc. And then, We surveyed from monitoring and random observations that Korean wild boar, Korean water deer, Korean hare, Korean racoon dog, Siberian wease and Chinese Roe Deer have used corridors in habitats. 16 species were distributed in Gyeongsangnamdo. Most of them were found at forest, stream, road and cultivated land etc. by killed body, foot scar. To process this survey, the wild animal were sacrificed by the roadkill which were Korean water deer are 12 case, Korean racoon dog 20 case, Korean wild boar 1 case and Korean Squirrel 24 case in the road, respectively. In this paper, we are obtained the results what role ecobridge may have for the protection of threatened species and fragmentation of habitats.