불소가 첨가된 실리콘 산화막의 다층금속절연 특성에 관한 연구

權大赫,南基泓,吳相光 慶一大學校 1997 論文集 Vol.14 No.2

The characteristics of fluorinated silicon oxide (SiOF) films prepared by plasma enhanced chemical vapor deposition(PECVD) were discussed. The deposition of these films was carried out in the temperature range of 80 - 220℃ in a conventional parallel plate plasma reactor with 〈 ±3% uniformity by flowing 2 sccm of disilane (Si₂H6), 100 sccm of nitrous oxide (N₂O), and 20 sccm of tetrafluoromethane (CF₄). AS the deposition temperature increased from 80 to 220℃, the deposition rate of the films increased from 16.7 to 18.4 nm/min; meanwhile, the etch rate decreased from 2.69 to 1.48 nm/sec. The refractive index was 1.46 regardless of the deposition temperature. The Fourier transform infrared (FTIR) spectra of the films showed decreasing Si-O stretching wave number with increasing full width at half maximum (FWHM) as deposition temperature increased. The high frequency capacitance-voltage (C-V) measurements of the metal-oxide-semiconductor (MOS) capacitors fabricated using the films showed increasing effective oxide charge density and decreasing dielectric constant with increasing deposition temperature. Deposition temperature of 180℃ resulted in films with the smallest dielectric constant of 3.75. These films showed an average breakdown strength of 9.14 MV/cm with 77.5% of the MOS capacitors having breakdown field strength ≥9.5 MV/cm

Rabson Mendenhall syndrome의 치험 증례 : A CASE REPORT

권장혁,박기태 大韓小兒齒科學會 2004 大韓小兒齒科學會誌 Vol.31 No.3

Rabson Mendenhall syndrome은 Rabson과 Mendenhall에 의해 1955년 처음 발표된 증후군으로서, 심한 insulin resistance를 보이는 희귀한 상염색체 열성 유전성 질환이다. Insulin receptor의 돌연변이나 insulin이 작용하는 다른 target cell의 결함에 의해 나타나며, 일반적인 증상으로는 흑색가시세포종(acanthosis nigricans), 다모증(hypertrichosis), 손발톱 비대 (onychauxis), 성장 지체 (growth retardation), 성 조숙(precocious puberty), 생식기의 비대, 팽만된 복부(protuberant abdomen), 건성 피부(xerotic skin) 등이 나타난다. 악안면 영역에서는 치아의 이형성, 거친 얼굴의 피부, 하악 전돌, 균열 혀 (fissured tongue)와 같은 특징적 증상이 나타난다. 이에 본 증례에서는 Rabson Mendenhall syndrome으로 본원에 내원한 4세 환아에게 관찰된 치과적 특징들에 관하여 보고하는 바이다. Rabson-Mendenhall syndrome(RMS) is first characterized in 1955 by Rabson and btendenhall. RMS is a rare autosomal recessive variant with insulin resistance. This is due to insulin receptor mutations or other target-cell defects in insulin action. General findings include acanthosis nigricans, hypertrichosis, onychauxis, growth retardation, precocious puberty genital enlargement, protuberant abdomen and xerotic skin. Characteristic oral and maxillofacial findings include dental dysplasia, coarse facial skin, prognathic jaw and fissured tongue. In this case report, dental characteristics of a 4-year old boy with Rabson-Mendenhall syndrome are described.

웹 환경에서 대구시립 공공도서관의 GIS구축을 위한 GUI 개발

부기동,남인길,권혁동 대구대학교 과학기술연구소 1999 科學技術硏究 Vol.6 No.2

This paper develops a GUI for GIS construction of Taegu City Library. This study proposes an easy method to develope GUIs which enables openGIS in the web environment. For a case study of Taegu City Library, the study constructs its GUI which performs map overlaying, referencing attribute tables, graph analysis, drawing up of thematic map.

임신 생식관련인자와 비만위험

장기홍,권혁찬,이득주,유희석,이은주,한인권 대한비만학회 1995 The Korean journal of obesity Vol.4 No.1

It is thought Omt there is a close relationship between obesity and pregnancy, but there are not any concrete studies in Korea. Therefore, a retrospective study was conducted to evaluate how factors surrounding pregnancies affect the body mass index. 385 women who had no history of disease or medication as a cause of obesity were randomly selected, and factors vlated to pregnancy vi ere compared between a normal body mass index group and a group where the body mass index was more thsn one standard deviation from the average. The average age of the study group was 44,25 years(S.SS) and the average body mass index was 23.09 kg/m2(3.00). 4 the obese group the average age was statistically higher, the level of education was statistically lower, but there was no statistica] difference with regard to smoking, alcohol consumption and exercise. Age showed to be statistically significant positive correiation with body mass index, but the level of education showed negative correlation. The age of first pregnancy, age of first delivery, and the mterval between menarche and first pregnancy showed statistieally significant negative correlation with the body mass index, whereas the duration of lactation, total number of pregnancies showed statistically significant positive correlation with body mass index. There was statistical1y significant more deliveries in the group where the body mass index was more than one standard deviation frvm the average, the risk for obesity was 2.5 times higher in women who had three or more deliveries compared to those who had less than three deliveries, and the risk was 1.5 times higher in women who had their first delivery before the age of 25 years compared to those over the age of 25 years. But other factors were found not to be different between the two study group and were independent of age, level of education, aleohol consumption and smoking. It can be seen from these results that pregnancy related factors are related to obesity, and that especially age, level of education, alcohol consumption and smoking independantly increase the risk for obesity. Also those women who have had more than three deliveries or who had their first pregnancy before the age of 25 years were at risk, and there should be a formulative plan for these women. It is hoped that in-depth study of pregnancy factors contributing to obesity be determined with further study and research.

뇌자도 측정을 위한 저잡음 Nb SQUID 센서의 설계 및 제작

이용호,권혁찬,김진목,이상길,임청무,박용기,박종철 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1

We report on the design, fabrication and performances of a low-noise Nb SQUID sensor for neuromagnetic measurements. The main features of the developed sensor are i) large flux-to-voltage transfer, making the SQUID readout electronics simple, and ii) use of the integrated planar pickup coil to eliminate the environmental magnetic field noises. The magnetic field noise of the developed SQUID sensor is below 5 fT/√Hz at 100 Hz, which is low enough to be used in neuromagnetic measurements.

초음파 어레이를 이용한 이동 로봇의 장애물 회피에 관한 연구

김병남,권오상,김기호,이응혁 建陽大學校 1999 建陽論叢 Vol.- No.7

For mobile robot, the navigation effectiveness can be improved by providing autonomy, but this autonomy requires the mobile robot to detect unknown obstacles and avoid collisions while moving it toward the target. This paper presents an effective method for autonomous navigation of the mobile robot in structured environments. This method uses ultrasonic sensor array to detect obstacles and utilizes force relationship between the obstacles and target for avoiding collisions. Accuracy of sensory data produced by ultrasonic sensors is improved by employing error eliminating rapid ultrasonic firing (EERUF) technique. Navigation algorithm controlling both the velocity and steering simultaneously is developed, implemented to the mobile robot and tested on the floor filled with the cluttered obstacles. It is verified that from the results of the field tests the mobile robot can move at a maximum speed of 0.66 m/sec without any collisions.

유치열기 정상교합아동의 측모두부방사선 계측연구

김지연,권장혁,김경호,박기태 大韓小兒齒科學會 2005 大韓小兒齒科學會誌 Vol.32 No.4

본 연구의 목적은 유치열기 부정교합의 진단자료로 사용할 수 있는 정상 계측치를 알아보는 것이다. 4세에서 6세 사이 유치열기 정상교합아동 32명의 측모두부방사선 계측사진 및 안모사진을 이용하여 악골 및 연조직의 전후방적, 수직적 관계를 분석하였다. 수평적인 골격성 계측항목 중 SNA는 83°,SNB는 78.72°,ANB는 5.28°를 나타내어 하악골이 상악골에 비해 후방에 위치하고 있었으며 수직적인 골격성 계측항목 중 Gonial angle은 127°를 나타내어 성인에 비하여 High angle pattern을 보였다. 연조직 분석에서는 성인에 비해 convex한 soft tissue profile이 관찰되었다. 치성 계측항목 중 U1 to SN은 91.04°, IMPA는 86.57°를 나타내어 성인에 비해 reteroclination된 상하악 유중절치가 관찰되었다. 정상교합아동의 골격성분석에서 여자가 남자에 비하여 평균 나이가 많음에도 불구하고 linear measurement는 전제적으로 남자가 여자보다 큰 수치를 보였다. The present study was designed to formulate cephalometric norms of normal occlusion for usage in orthodontic diagnosis of malocclusion in Korean children. Thirty two children, aged 4 to 6. with normal occlusion were chosen for this study. Sagittal and vertical relations were analyzed using lateral cephapogram and clinical photos and the measurements were compared with those of adults. On skeletal sagittal analysis, the mean values of the SNA and SNB angles were 83°and 78.72°. It showed that the mandible was retrognathic and retropositioned in comparison to those angle pattern in children and reduction of gonial angle due to counterclockwise rotation of the mandible. On dental analysis. the mean values of the U1 to SN and IMPA were 91.04° and 86.57°, This showed retroclined upper and lower deciduous teeth in comparison to adults. For values. the linear values were generally greater in males than females.

ZnO 압전박막을 이용한 FET형 압력센서의 특성

양규석,권대혁,남기홍,손병기 경북대학교 센서기술연구소 1994 센서技術學術大會論文集 Vol.5 No.1

A new FET type pressure sensor has been investigated to overcome the problems of the conventional silicon piezoresistive and capacitive pressure sensor. The PSFET( pressure sensitive field effect transistor) is a new FET type pressure sensor which the operation theory is combined with the field effect of MOSFET and the piezoelectric effect of piezoelectric thin films. This sensor can overcome the fabrication problems of conventional silicon pressure sensors and realize productivity, standardization, miniaturization, integration because the whole fab. process is compatible to the planar technology. A ZnO thin film as a piezoelectric material, 5000Å thick, was deposited on a FET gate by RF magnetron sputtering and the optimum deposition condition was 300℃ substrate temperature, 5mtorr working pressure, Ar ambient and 140watt RF power, respectively. And the device was annealed at 400℃, O_(2) ambient for 1 hour to obtain a better C-axis poling structure. The fabricated PSFET device showed piezoelectric voltage(40mV/kgf/cd) and sensitivity (21μA/kgf/cm^(2)) according to an applied pressure(1kgf/cm^(2)~4kgf/cm^(2)).

淸上補下湯이 Allergy喘息의 呼吸樣狀과 氣管粘膜의 好酸球變化에 미치는 影響

李珩九,鄭昇杞,鄭熙才,權赫星 慶熙大學校韓醫科大學韓醫學硏究所 1999 慶熙韓醫大論文集 Vol.22 No.1

To find out the effects or Chungsangboha-tang on allergic asthma. We had checked change of respiratory pattern, frequency ratio of abnormal respiratory rate, change of eosinophilic infiltration in tracheal mucosa in experimental animal which was evoked allergic asthma then got the following results. 1. There was no significant difference in individual respiratory pattern between sample group which was treated with Chungsangboha-tang and control group. 2. To compare with control group, statistically sample group was showed significant decrease(p<0.05) frequency ratio of abnormal repiratory rate which was mean of expiratory respiration difficulty. 3. To compare with control group, statistically sample group, which was treated with Chungsangboha-tang, showed significant decrease(p<0.05) eosinophilic infiltration in tracheal mucosa.

절수에 의한 Mongolian Gerbil 장기중량변화에 관한 분석연구

김무강,이기훈,이강이,송치원,이경열,권효정,박미선,정승혁,이행연,김명철 충남대학교 수의과대학 동물의과학연구소 2000 動物醫科學硏究誌 Vol.8 No.-

In this study, authors measured the each organ weight of the long term water deprived Mongolian gerbil, after then we calculated the mean, standard deviation, variance coefficient of the real measured organ weight and induced the organ weight change quantity, rate of quantity, deviation between measured and theological organ weight, deviation rate, sum of deviation rate, organ weight change rate, rate of organ weight by the mathematical formula. The results obtained as follow 1. The weight of the brains, lung, and testis were abruptly decreased after water deprived until the 5th day, after then slowly decreased until the 20th day. 2. The weight of the heart was decreased gradually from the first day until the 20th day. 3. The weight of the liver was abruptly decreased until the 10th day, after then the more slowly decreased until the 20th day. 4. The weight of the thymus, spleen, kidney, and pancreas were abruptly decreased until the 15th day, after then increased slowly until 20th day but the weight of the kidney was abruptly increased from the 10th day. 5. The organ weight change rate and the rate of the each day organ weight were very diversified.