Pt-Co 합금박막형 측온저항체 온도센서의 제작과 그 특성

홍석우,최영규,정귀상 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1

We made Pt-Co alloy resistance patterns on the Al_(2)O_(3) substrates by lift-off method and investigated the physical and electrical characteristics of these films under various conditions (the input power, working vacuum, annealing temperature, thickness of thin films) and also after annealing these films. The TCR value of Pt-Co alloy thin films was measured with various thickness of thin films and annealing conditions. The optimum TCR value is gained under conditions 3000Å of thin films thickness and 1000°C of annealing temperature. These results indicate that Pt-Co alloy thin films have potentiality for the high resolution RTD temperature sensors.

頭蓋低의 屈曲度에 따른 각 骨格要素의 適應樣相에 關한 硏究

任洪錫,車敬石 대한치과교정학회 1992 대한치과교정학회지 Vol.22 No.1

This study was performed to define the adaptation patterns of each skeletal components to the flexures of cranial bases, using 91 males from the ages of 17 to 36 and 64 females from the ages of 16 to 34, without orthodontic or prosthetic treatment experiences and with pleasant profiles as subjects. The conclusions are as follow: 1. When considering the changes of flexure of cranial base(Ba-SE-FMN) in both sexes, changes in the anterior cranial base angle to the PM Vertical line (SE-FMN/PMV) were greater than the changes in the posterior cranial base angle to the PM Vertical line(Ba-SE/PMV). Subsequently the nasomaxillary complex showed antero-superior rotating effect as the cranial base angles were increased and postero-inferior rotating effect as they were decreased. 2. Horizontal mandibular angle (Ba-SE-Me) was increased in both sexes as cranial base angle increases(Ba-SE-FMN) and it decreased as the latter was decreases. There by indicating compensatory effects. 3. Maxillary angle(SE-FMN-A) was decreased in both sexes as cranial base angle(Ba-SE-FMN) increases and it increased as the latter was decreased. There by indicating compensatory effects. 4. Mandibular ramus angle to posterior cranial base was decreased in both sexes as cranial base angle increases. There by indicating compensatory effect to anteriorly displaced maxilla and the mandibular ramus angle was increased as the cranial base angle decreases. There by indicating compensatory effect to posteriorly displace maxilla. 5. The length of posterior upper facial height was decreased in both sexes as the cranial base angle increases and it increased as the latter was decreased.

수술후 소아에서 발생한 간염 : 1예 보고 1 case report

문현석,양홍석,진홍용 중앙대부설한국의과학연구소 1986 한국의과학 Vol.18 No.1

제어 입력에 시간 지연을 갖는 선형 시스템의 견실한 H∞ 제어기 설계

류석환,김홍락 대구대학교 과학기술연구소 1997 科學技術硏究 Vol.4 No.1

In this paper, a solution of the H∞ control problem for linear uncertain systems with input time delay is presented. An H∞ norm bounded condition is obtained as a sufficient condition for linear uncertain systems with input time delay. Based upon this sufficient condition, a robust H∞ controller design method which involves the solutions of linear matrix inequalities is developed. A numerical example is solved in order to illustrate the efficacy of the suggested design method.

대향분사 성층연소에 의한 미연탄화수소의 저감

김홍석 조선대학교 환경연구소 1994 環境公害硏究 Vol.11 No.-

The direct injection stratified charge engine is considered to be an alternative to the conventional spark ignition engines. However, its actual utilization is prevented by high emission of unburnted hydrocarbons during light load operation. In order to solve this problem, an opposed injection stratified charge system with a pair of fuel injectors was examined using a pancake-type constant volume bomb. Unburnted hydrocarbons were reduced greatly as compared with the basic DISC system with a single fuel injector. This effect may be due to the promoted fuel-air mixing and to the increase the flame propagation velocity leaving less amount of over-lean mixture.

마이크로머신용 유리기판의 미세가공

정귀상,홍석우,김순철 東西大學校 1998 동서논문집 Vol.4 No.-

Electro Discharge Machining(EDM) is a so-call nonconventional machining technique. This paper presents the experimental results of an EDM technique for the fabircation of microholes on #7440 pyrex glass substrates. With various applied voltages and various concentration of NaOH or KOH solution, the glass substrates have been microdrilled using the copper electrodes of which diameters are 250 ㎛ 새 450 ㎛. The machined throughholes have been observed the top diameter, the bottom diameter and machining time have been measured. EDM in NaOH solution causes the fabrication to have better the surface condition, higher selective of electrode, lower concentration of solution with respect to EDM in KOH solution machined fabrication.

비글개에서 분만 후 자궁수복의 연속적 초음파상

손형원, 김홍석, 김형진, 김일화, 이기창, 이청산, 강현구 충북대학교 동물의학연구소 2006 Journal of Biomedical and Translational Research Vol.7 No.2

본문참고

백금-코발트 합금박막을 이용한 측온저항체 온도센서의 제작

정귀상,홍석우,박정도 東西大學校 1998 동서논문집 Vol.4 No.-

Platinum-Cobalt alloy thin films were deposited on Al₂O₃substrates by r.f. cosputtering for RTD temperature sensors. We made Pt-Co alloy resistance patterms on the Al₂O₃substrates by lift-off method and investigated the physical and electrical characteristics of these films under various conditions (the input power, working vacuum, annealing temperature, thickness of thin films) and also after annealing these films. At input power of Pt: 44 W/㎠, Co: 6.91 W/㎠, working vacuum of 10 mTorr and annealing conditions of 1000℃ and 60 min, the resistivity and sheet resistivity of Pt-Co thin films was 15 μΩ·cm and 0.5 Ω/□, respectively. The TCR value of Pt-Co alloy thin films was measured with various thickness of thin films and annealing conditions. The optimum TCR value is gained under conditions 3000 A of thin films thickness and 1000℃ of annealing temperature. These results indecate that Pt-Co alloy thin films have potentiality for the high resolution RTD temperature sensors.

폐모세포종 : 1례보고 A Case Report

최영호,서홍주,임영혁,김정중,박성강,이석기,임진수,김은규 조선대학교 2001 The Medical Journal of Chosun University Vol.26 No.2

Pulmonary blastoma is a very rare primary neoplasm of the lung. We experienced a case of pulmonary blastoma in a 40 years old man. The mediobasal segmentectomy of the right lower lobe was performed. The patient was discharge on the postoperative days 6. There is no evidence of recurrence or metastasis on followup study during 7 months period after operation.

단백뇨를 보이는 사구체 질환 및 당뇨병성 신병증에서의 Lp(a)

권태환,김준홍,조성,김석재,김용림,조동규,백미영 경북대학교 병원 1998 경북대학교병원의학연구소논문집 Vol.2 No.1

Background: Recently there has been evidences that serum Lp(a), an independent risk factor to atherosclerotic cardiovascular diseases, were increased in proteinuric disorders such as nephrotic syndrome and diabetic nephropathy. Methods: We intended to search of altered concentrations of Lp(a) in proteinuric disorder measuring serum Lp(a) concentrations with ELISA in 44 glomerulonephritic patients(25 nephrotic syndrome(NS), 19 non-nephrotic range proteinuric glomerulonephritis(GN), 25 diabetic nephropathy patients(DN), and 31 healthy controls(HC). Also, we compared Lp(a) concentration between glomerulonephritis patients and diabetic nephropathy patients with proteinuria of similar degree. Results: 1) There were significantly increased levels of total choesterol, triglyceride, and LDL-cholesterol in Ns compared to GN, DN, HC. 2) There were significantly increased concentrations of serum Lp(a) in NS compared to HC, but no signiicant difference in serum Lp(a) among NS, GN, and DN. 3) There was no significant difference in serum Lp(a) concentrations between NS & DN with 24 hour urine protein greater than 3.0g. 4) There was no significant difference in serum Lp(a) concentration between GN with 24 hour urine protein greater than 0.5g and less than 1.5g and DN with proteinuria of simial degree. 5) In glomerulonephritis patients, there was negative correlation between serum Lp(a) concentration and serum albumin level but correlation with 24 hour urinary protein, total cholesterol, Ldl-cholesterol, and HDL-cholesterol was not shown. In diabetic nephropathy, there was no significant correlation among serum Lp(a) concentration and all parameters including serum albumin, 24 hour urinary protein, and other lipid profiles. Conclusion: The present study confirmed that patients with nephrotic syndrome of diverse etiologies have makedly increased plasma level of Lp(a), in conjunction with other lipid abnormalities. However, this study shows no difference in Lp(a) concentrations between diabetic nephropathy and glomerulonephritis with similar degree of proteinuria.