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유동주,허 웅,김근이,이호재,임현수 明知大學校 産業技術硏究所 1992 産業技術硏究所論文集 Vol.11 No.-
In this paper, we implemented a pulse oximeter system which is measured oxygen saturation coefficient of a human blood in vivc We use the Beer-Lambert Law to measure the percentage of hemoglobin is oxygen saturation. The oximeter sensor are consisted of two LED(RED and INFRARED LED) and a single photodiode. The photodiode measures lights which transmitted through the tissue from two light source alternately, We calculated a ratio of light transmittance between two LEDs and then, it applied for the oxygen saturation coefficient calculation to formula. As a result, the oxygen saturation coefficient that measured from normal conditions men was 96.43[%]
주유철,이동민,양종태,신병철,임태영,서정균,정기영,최동헌,김원,조영신,고희관 조선대학교 2001 The Medical Journal of Chosun University Vol.26 No.2
Background and Objectives : Palindromic rheumatism (PR) is known to be triggered without any obviously inciting events in most patients, although, in a few cases, attacks have been noted to relate to another events such as weather change, childbirth, ingestion of certain foods, or over-exercise. The aim of this study was to characterize the triggering factors on palindromic attacks. Materials and Methods : We evaluated sixty-four patients with PR for the presence of triggering factors and the relationship between attacks and triggering factors by interview of patients. We considered that there was an probable association between episodes and PR, if episodes within 24 hours prior to PR had triggered at least 50% of all attacks and a definite association between episodes and PR, if episodes within 24 hours prior to PR had triggered 100% of all attacks. Results : In 15 patients (35.9%), there was a possible association between episodes of PR and initiating events. In 8 patients (12.5%), there was a definite association between episodes of PR and initiating events. The triggering factors were physical over-activity including exercise (19/64: 29.7%), foods, such as rawfish, crab, and chicken, including alcohol (19/96: 19.8%). However, there were no difference between the groups with and without the triggering factor in sex ratio, duration and onset of PR, the positive rate of rheumatoid factor and involved sites. Conclusion : Our observations showed that PR was triggered by physical over-activity more than in previous reports and hypersensitivity to foods was a causative factor in some patients with PR. However, patients with triggering factors had a similiar clinical profile to patients without triggering factors.
멀티미디어 스트림 처리를 위한 효율적인 프록시 캐슁 기법
元裕憲,朴淳東,尹鐵柱 弘益大學校 科學技術硏究所 2000 科學技術硏究論文集 Vol.11 No.-
The growth of the internet in the past few years has led to network congestion and server overloading. Use of proxy cache solve this problem. Despite success of proxy cache in the internet, proxy cache is not efficient for multimedia stream such as video and audio. In this paper, we propose a new proxy cache policy and a efficient cache replacement algorithm for multimedia stream. We expect that a new proxy cache policy is efficient for multimedia stream.
광섬유 방사선 센서와 EBT 필름을 이용한 심부선량 백분율 측정 및 비교
조동현,장경원,유욱재,신상훈,이봉수,문주현,박병기 제주대학교 방사선응용과학연구소 2008 방사선응용과학연구소논문집 Vol.22 No.-
In this study, fiber-optic sensor is fabricated to measure PDD of CLINAC. As a scintillating light generated by a high energy X-ray from the medical LINAC is measured using photo diode amp system, It is expected that a high-resolution, real-time fiber-optic dosimeter for medical LINAC can be developed.
세라믹 브라켓과 교정용 접착제에 따른 전단 결합 강도의 비교 연구
이주원,유동환,김상철 대한치과교정학회 1997 대한치과교정학회지 Vol.27 No.2
여러 세라믹 브라켓과 접착제에 따른 전단 결합 강도를 비교하기 위하여, 영구 소구치 48개를 대상으로 베이스의 유지 형태가 다른 3종의 세라믹 브라켓을 광중합과 화학 중합을 포함한 3종의 교정용 접착제를 사용하여 접착하고 전단 결합 강도와 파절 양상을 관찰한 결과, 화학 중합형 레진으로 접착한 경우 광중합형으로 접착한 경우보다 결합강도가 높았으며, 화학적 결합을 하는 Starfire 브라켓이, 기계적 결합을 하는 Transcend나, 복합형 결합인 Fascination 보다 전단 결합 강도가 낮았다. Transcend는 주로 법랑질과 레진(E/R)에서, Fascination은 법랑질, 레진, 브라켓 베이스에 혼합(COMB)되어 파절되며, Starfire는 레진과 브라켓 베이스(R/B)에서 파절이 나타났다. The purpose of this study was to evaluate the shear bond strength of three kinds of different ceramic brackets with three different bonding adhesives. 5 specimens for each combination were tested for shear bond strength using Instron and for fracture site using SEM. And 3 specimens were cross-sectioned for SEM examination of bonding pattern between bracket, resin and enamel surface. The results were as follows 1. The shear bond strength of chemical curing adhesives were higher than that of light curing adhesives. 2. The shear bond strength of Starfire bracket, chemical-bonded type, was lower than that of Transcend bracket, mechanical-bonded type, and Fascination bracket, combined type. 3. Fracture site of each bracket and tooth surface was examined under a light optical stereoscopic microscope, Transcend groups were mainly at the E/R interface. Fascination groups were mainly at the COMB interface and Starfire groups were mainly at the R/B interface.
이상민,유동우,이용진,변근주 연세대학교 산업기술연구소 1992 논문집 Vol.24 No.1
Polymer-Impregnated Concrete(PIC) is a new polymer-concrete composite material which consists of basic cement concrete and polymer. The mechanical properties and behavior of PIC depend on the type of polymers and the impregnation techniques. In general, the polymer impregnation can improve the strength, durability and ductility of normal concrete. The objective of this study is to develop the analytical procedure for analyzing the structural responses of polymer-impregnated concrete flexural members with different polymer loading by using finite element method on the basis of experimental results.