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.

매복 하악 견치의 자가이식술을 이용한 치험례

홍성수,이상호,김동필 大韓小兒齒科學會 1997 大韓小兒齒科學會誌 Vol.24 No.3

Autotransplantation is the transplantation of embeded, impacted, or unerupted tooth, into extraction socket or surgically prepared socket in the same individual. Clinically, successful autotransplantation must show radiolucent space(preiodontal ligament space) between transplanted tooth and supporting bone, lamina dura, no root resorption, no ankylosis, no inflammatory change, and physiologic tooth mobility. It is important that procedure is atraumatic, and the instruments should not contact the root surface during procedure. We performed autotransplantation of impacted mandibular canine that transversely located beneath the apices of the mandibular incisors with uncompletely developed apex. In radiographs and clinical evaluation, this transplant showed successful clinical finding except irregularity of mesial root surface after 14 months. It is concluded that transplantation of canine with 1/2∼3/4 root development provides a good chance of pulp survival, limited risk of root resorption and ensures sufficient final length, and is thus recommended.

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.

대학생들의 氣에 대한 의식 조사 연구

홍성균,이성수,안규동,이병국 순천향대학교 산업의학연구소 2001 순천향산업의학 Vol.7 No.1

Ki is emerging and getting popular as a new alternative therapy in new millenium. The purpose of this study was to investigate the understanding and experience of the Ki therapy for college students. 320(Male=138, Female=182) students were participate in this study. Study subjects were answered with prepared 8 questions for their personal opinion and experience about Ki therapy. Study variables about personal information such as sex, blood type, religion, health status, personality, parent's religion, parent' occupation and parent educational level were also collected. The results of this study were as follows; 1 Among all study students (n=320), 89% of students answered positively in the existence of Ki, whereas only 11% answered negatively. 2. Among all study students (n=320), 13% (n=41) of students had a chance to have a Ki therapy and among 41 students 93% of them had experienced real Ki in any kind of form. 3. Among 41 Ki experienced students, 32% of students felt a feeling of floating and flying, 25% of students felt a feeling of pulling from the back and 21% of students felt a feeling of warming and comfortable, 10% of students felt refreshment and 5% of students felt a feeling of dizziness, whereas only 7% of students did not feel anything from Ki therapy. 4. While 53% of students among 41 Ki experienced students experienced their Ki in Ki training center, 31% and 6% of students experienced in college or university and other place, respectively. 5. Among all study students, 89% of students thought that Ki therapy was useful and wanted to have Ki therapy in case of medical attention, whereas only 11 % of students did not want Ki therapy. 6. Among study students with positive thinking about Ki therapy, 24% and 23% of students thought Ki therapy useful for (endocrine and skin diseases) and chronic adult diseases such as hypertension, cardiac disease, diabetes and obesity, respectively, whereas 21% and 18% of study students thought Ki therapy useful for neuropsychiatric disease and digestive diseases, respectively. 7. Regarding to the reason of attraction of Ki therapy compared with other treatment methods, 51% of students answered that Ki therapy gave comfortable and easiness to mind and 42% of students answered that it did not need any kind of injection or medicine.

무선데이터 손실을 최소화하기 위한 실내 무선환경 분석

홍성욱,김흥수 濟州大學校 情報通信硏究所 1999 情報通信硏究所論文集 Vol.2 No.-

In order to minimize the loss of wireless data, an indoor radio environment is analyzed. As received signal is composed of multipath wave being caused by various media. the factors of signal fluctuation are studied by using the electrical characteristics of media. An equation which is a function of the electrical characteristics is derived by using the polarizations of antenna and the reflection theory. We take the strength of waves in corridor and between the two floors. and compare the measured data with the theoretical data.

제주시 지역 마이크로셀 환경에서의 전파 특성

홍성욱,김흥수 濟州大學校工科大學産業技術硏究所 1995 尖端技術硏究所論文集 Vol.6 No.-

In the mobile radio communication system, we must study wave propagation characteristics for microcell and picocell environments because the conventional cellular environment is changing to microcell and picocell. In this paper, sample areas are selected to study propagation in variety of environment including the width of road, the built-up density and the height of building at Cheju city area. Sample area is separated two zones by break point at which the slope of the signal strength is changed. The location of the break point is calculated on first Fresnel zone clearance for antenna height variation. The slope and the standard deviation of the signal strength is obtained by the regression analysis. The break point distance can be used to define the size of microcell and to design of microcellular system.

암센서용 TiO2/Au/CNT 나노복합물의 전기화학적 검출

홍성미, 김홍일, 김한주, Wang, Xuemei, 박수길 충북대학교 건설기술연구소 2008 충북대학교 건설기술연구소 논문집 Vol.27 No.1

Demand of rapid detection for cancer, it is necessary that high sensitivity, specificity, low cost, and simple method. CNT and metal nano materials are widely used to elecate efficient. CNT have various advantage, and can be composed with metal nano materials. Especially, Titanium oxide and gold nano particles are focused on sensor for detection of cancer, it can elecate electron transition feeiciency between electrode surface and target materials, and biological functionalization of CNT. It means that nano material is composed each other. In this study, electrodes are considered materialsd and their chracteristic for cancer sensor.

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.

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.

Niwaella multifasciata Wakiya et Mori (Cobitidae)의 附屬骨格

成娟濟,楊洪準,南明模,蔡秉洙 경북대학교 과학교육연구소 1988 科學敎育硏究誌 Vol.12 No.-

The appendicular skeleton of Niwaella multifasciata was described as a part of systematic study of Cobitidae. In the pectoral girdle, posttemporal was sigmoid form, and upper and lower arms of cleithrum had an angle of 105°, the length of lower arm was one-third of upper one. The scapular had a foramen in the center, and actionst was consisted in three pairs of bone. Postcleithrum was absent. Pelvic girdle was consisted in a pair of innominatium and three pairs of basiost. In the pterygiophore, dorsal fin was supported by three interneural spine and thirteen basiost, and interneural spine was located between the neura니 spin of the 27-31th vertebrae. Anal fin was supported by five interhemal spine and nine basiost, interneural spine was located between the hemal spine of the 42-45th vertebras.