Ni-Ti file을 이용한 유치의 근관치료

홍상진,홍성수,고승백,이봉규 조선대학교 구강생물학연구소 2002 Oral Biology Research (Oral Biol Res) Vol.26 No.2

The pulpectomy or root canal treatment on primary teeth is to be done when there is evidence of chronic inflammation or necrosis in the radicular pulp. Due to the tortous and ribbon-shaped anatomy of the primary teeth, the instrumentation of endodontic hand files and barbed broaches is not an easy procedure. Recently, Ni-Ti rotary instruments have been developed and has made endodontic treatment easier and faster. This report describes two cases of root canal treatment on primary molars uasing Ni-Ti rotary files. The cevical constricture was eliminated by the crown-down method. as smaller file proceeded unhindered into the apical third of the canal. In addition, the crown-down thenique enhanced the efficacy of the endodontic irrigant. the use of rotary instrumentation for primary teeth seemed to be more effective way to debride the uneven walls of primary teeth.

제주도 위성사진에 의한 지형분포에 따른 반사계수 비교

홍성욱,김흥수 濟州大學校 産業技術硏究所 1997 산업기술연구소논문집 Vol.8 No.2

The goal of this paper is to predict the range of the reflection coefficient on the area which is divided by the satellite photograph in Cheju. We select the sample points on the smooth surface and measure the field strength. The range of the reflection coefficients on the sample area are obtained by the regression analysis as function of the coefficient for incidence angle and the measured field strength. The field strength in the divided area are obtained using this coefficient. The difference between the measured results and theoretical predictions is only within 5dB.

주파수 응답 함수를 이용한 평면 밀링에서의 채터 예측

홍성욱,박중윤,김현수,박재현,박창용 金烏工科大學校 産業技術開發硏究院 1999 産業技術開發硏究 Vol.15 No.-

The present paper investigates the chatter stability of a milling spindle-workpiece system in face milling process. To this end, a new method using frequendy response function is adopted for predicting the chatter vibration. A compliant workpiece is used to make the spindle-workpiece system easily exposed to chatter vibration. The entire experimental procedure, including measurement of frequency response function and cutting coefficients, is demonstrated. The experimental result shows that the chatter stability prediction method using frequendy response function is of great use in face milling process.

자원 제약 조건이 공기-비용 교환 문제에 미치는 영향 분석

홍성준,류한국,유정호,이현수 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1

It has been generally accepted that cost and time are in reverse proportion. But, due to the resource constraints such as resource capacity, resource availability, resource continuity and resource level, time and cost could have unfixed relation and time-cost trade-off curves could take various forms. This study proposes the labor-related constraints affecting the time-cost trade-off problems and analyzes the effects.

시설재배 작물의 적정 시비량 결정을 위한 간이 검정법

홍순달,김기인,강성수 충북대학교 첨단원예기술개발연구센터 2000 연구보고서 Vol.5 No.-

시설재배 토양의 질소공급능력을 예측할 수 있는 질산태 질소의 간이검정법을 개발하기 위하여 실험실 이온 전극법을 기준으로 test strip 측광기법, Hanna specific ion 비색법, Cardy meter법 등 분석방법간에, 그리고 토양수분조건에 따른 시료채취방법을 중량법 이외에 입자밀도법과 용적밀도법을 각각의 분석방법별로 비교 검토하였다. 정밀분석법인 이온전극법과 유사한 신뢰성을 갖는 간이검정법은 test strip 측광기법이었으며 영농현장에서의 활용성을 고려한 시료채취방법은 일정한 용적을 갖는 필름통을 이용한 용적밀도법이 가장 바람직하였다. 따라서 필름통을 이용하여 토양시료를 채취하고 중량은 용적밀도법으로 하는 test strip 측광기에 의한 현장검정법으로 신뢰성있는 토양의 질산태 질소 간이검정법을 개발하였다. 토양의 질산태 질소 함량이 46 mg kg-1에서 345 mg kg-1의 분포를 갖는 12개 시설재배 토양에서 시비수준을 무비구, 검정시비구 및 표준시비구로하여 토마토의 생산력을 검정하고 토양 화학성과의 상호관계 및 회귀관계의 평가로부터 질소 적정시비량 추천모델을 추정하였다. 무비구 토마토의 건물중 및 양분흡수량과 가장 밀접한 상관을 갖는 화학성은 질산태 산소였다. 토양의 질산태 질소 함량과 무비구 토마토의 건물중, 비료효과 및 시비효율의 회귀관계 분석으로부터 토마토 질소 무시비 재배를 위한 질산태 질소의 상한기준은 280 mg kg-1으로 추정되었다. 토양의 질산태 질소가 46, 96, 126 mg kg-1인 3개 토양에서 무비구 검정시비구 및 표준시비구의 3개 시비수준에 대한 건물중 변화관계로부터 토마토 질소 표준시비를 위한 질산태 질소 하한기준은 100 mg kg-1으로 추정되었다. 따라서 토양의 질산태 질소 100 mg kg-1이상에서 280 mg kg-1이하의 토양에 대한 질소 적정시비량은 회귀식 Y(표준시비량에 대한 시비비율, %) = -0.5556 x NO3-N (mg kg-1) + 155.568으로 평가되었다.

보행시 하지체질의 내적일 분석

홍성표,이순호,김희수 忠南大學校體育科學硏究所 1995 體育科學硏究誌 Vol.13 No.1

This study is to represent basic data of biomechanical work of human body which has been data measured precisely and is to see on pathology and abnormal gaits patterns. And 5, 6th grade boys in Taejon city were attended in this experiment. Each student wore 8 landmarks on their lower leg joints and walked for 4 Km/h, 5 Km/h, and 6 Km/h on the treadmill Mechanical energy of lower extremity segment by lower joint (thigh and shank) movement were measured in stance phase and swing phase which were assessed internal work and energy of segment The conclusions were as following; 1. Increasing gait velocity cause toe off in early stage and swing of lower extremity happen early and quickly with angle of shank increasing in swing phase. 2. Children gait velocity grow rapidly above 5km/h, internal work of thigh mechanical energy showed value of work clearly and large. and internal work change represent greater in shank than in thigh 3. The stance period of gait is the period off set by two operated cocontracting muscles, and the later the speed of gait is, the lower the effect of the net torque.

제품디자인에 있어서 인간공학 적용과정에 관한 연구 : Hand-Drill의 손잡이 형태에 빠른 EMG 적용을 중심으로 Focus on EMG Application for the shape of Hand-Drill Grip

홍성수,한정완 한국디자인과학학회 1998 디자인과학연구 Vol.1 No.-

디자인에서의 인간공학의 활용은 그동안 대단히 무질서하고, 난잡하게 적용되었다. 이것은 아직까지 디자인이 미술적 재능이나 경험적, 감각적인 재능의 부산물로 인식되기 때문에 이 시점에서 디자이너는 인간공학 도입의 본래의 취지에 맞게 디자인을 객관적, 정량적인 방법으로 수행해야 할 것이다. 따라서 본 연구는 EMG 시스템을 이용하여 Hand-Drill의 손잡형태가 팔근육에 미치는 영향에 대한 가설을 통하며 Hand-Drill디자인시 보다 객관적인 인간공학적 접근방법을 모색하고 적정각도 및 굵기를 정량적으로 제시하고자 한다. 이를 위해 5명의 신체 건강한 20대 피실험자을 대상으로 Hand-Drill 손잡이 각도 굵기를 독립변수, 팔근육에 미치는 힘을 종속변수로 설정하여 Hand-Drill의 각도와 굵기가 팔근육에 미치는 영향에 대해 조사 분석하였다. 측정된 자료를 통계분석한 결과 각도 0°, 굵기 2.56cm일 때 근육에 미치는 힘이 적게 나타났다. 본 연구의 결과는 제품디자인에 있어서 EMG 신호를 이용하여 각 형태를 인간공학적 방법으로 정량화 하였고, Hand-Drill 디자인에 있어 각도와 굵기에 대한 추천지로 제안 될 수 있다고 본다. 추후에는 진동, 단면적 형태, 무게 등의 독립변수 요인을 추가 확대하여 Hand-Drill 디자인에 응용한다면 더욱 유용하리라 생각된다. Human Factor, a practical science that is an application fields, has been employed and used in industrial importance. But we limited Human Factor on anthrome design work, and have used it as sensible data only. It is necessary that scientific, quantitized and responsib be applied in industrial design. In this paper, I propos design process can be used in EMG system of biom Human Factor with responsible and quantitized characteristics of EMG system is described and the cap application of EMG system of industrial design is pre-experiment. I applied this result to joystick leve hydraulic excavator. In this paper, 1 emphasize that objective aid standa applied to EMG system experiment process and indu process integratively. And I suggest that systematic method be applied to H in industrial design.

體育科 Mat運動의 能力別 學習 適用效果에 關한 硏究

洪盛杓,陣潤洙 忠南大學校體育科學硏究所 1984 體育科學硏究誌 Vol.2 No.1

This study was conducted to see the application effect of learning by ability in Mat exercise. 367 Male middle school students who were second grade were served as subjects. They were divided into control group and experimental group. Control group was hetrogeneous group and experimental group was organized group by ability. After 8 hours' learning of Mat exercise, their motor performance were compared. The following conclusions were obtained; 1. In teaching of Mat exercise in Male middle school, group-organization by ability was more effective than hetrogeneous group-organization. 2. In stepped and systematic teaching materials such as Mat exorcise , effective motor skill improvement is possible through leaching method of group - organization by ability. 3. Especially in the learning of difficult motor events and motor events which need repeated practice and which lack of pre-learning, application effect of learning by ability is big.

GPS 동기신호 수신기 개발 : 중간 주파수단과 데이타 추출

홍성일,이수영,박재운,변건식 동아대학교 공과대학 부설 한국자원개발연구소 1993 硏究報告 Vol.17 No.2

This paper concerns IF-stage and data recovery as a basic study for home products of GPS receiver. Using a transmission simulator, the same data can be received as transmission simulator transmits. Consequently, it is considered that IF-stage and the part of data recovery operate fairly good and attaching microprocessor control and time interval counter to this system will operate better. It can be expected that providing the system with RF-stage and antenna will be complete GPS receiver.

치은섬유모세포 및 치주인대세포에 의한 교원질 수축에 관한 연구

홍영안,김현수,주성숙,신제원 慶熙大學校 齒科大學 1995 慶熙齒大論文集 Vol.17 No.2

The purpose of this in vitro study was to evaluate contraction of the human gingival and periodontal ligament fibroblast in the collagen matrix. The cell cultures were prepared using human gingiva and tooth. The collagen gels were observed daily with an inverted microscope and their area was determined by measuring the diameters of the collagen gel. The configurations of human gingival and periodontal ligament fibroblasts were done by SEM observation. The results as follows; 1. The contraction was found to be proportional to seeding cell without seeding cells, the contraction was not occured. 2. Periodontal ligament fibroblast was shown more fast contraction than gingival fibroblast. 3. The collagen matrix was translucent initially, but with fully contraction, the structure become opaque. 4. The collagen matrix with fibroblast were aggregated to form bundles and reorganized collagen fiber.