Screen Printing Method로 제작된 CdS 막의 광전도도

정해문,박철수 木浦大學校基礎科學硏究所 1985 基礎科學硏究誌 Vol.3 No.-

Photoconductive CdS films doped with CI were prepared by screen printing and sintering of CdS paste. The CdS paste consists of CdS, CdCl₂, and propylene glycol. The results of X-ray measurements showed that these samples belong to hexagonal structure, and the lattice constant were a=4.13A, c=6.71A. The spectral response of photoconductivity has two maxima. The one photoconductivity peak was observed at 524nm and the other broad peak at larger wavelength region at 285K. As the temperature decreases, the energy position of the maximum due to band absorption shifts towards shorter wavelength, and give a temperature coefficient of photoconductivity band peak of about ??. The rise and decay time of the photocontivity were 0.8ms and 0.7ms.

컴포넌트 기반의 건강관리 시스템 개발을 위한 UI 툴

정호진;주문일;박광호;박태향;김희철 인제대학교 2012 仁濟論叢 Vol.27 No.1

Component-based systems are generally known as useful for maintenance and extension. However, there are a number of difficult aspects in designing them, and skillful knowledge of component-based design is strongly requested. Against the problem, this paper presents a User Interface tool that helps to develop component-based healthcare systems more easily and effectively. This UI tool has been developed, aiming at enabling easier and faster development of such systems. Further it supports standardization and interoperability. We expect that use of the UI tool helps to add, delete, change medical contents, and maintain related systems with less effort and better performance.

선천성 대사 이상 환아에서 발생한 대사 위기의 복막 투석 치료 효과

강정혜,이동환,문철,김은미 순천향의학연구소 1996 Journal of Soonchunhyang Medical Science Vol.2 No.2

Purpose : We have evaluated the outcomes of peritoneal dialysis in patients with metabolic crises caused by in born error of metabolism. Methods : There are 6 patients(8 episodes, 4 males and 2 females) who had inherited inborn errors of metabolism and were admitted to the department of pediatrics, Shoonchunhyang university hospital in Seoul from December 1991 to December 1994. The technique of dialysis is discribed, in short: A Tenckhoff catheter was inserted surgically in all patients through the lateral abdominal wall. Commerically available dialysate solutions(Peritosol, Korea Green Cross Co.) was applied to 5 patients(7 cases) with hyperammonemia. In a patient with propionic acidemia, we used a special custiom made dialysate that replaces lactate by bicarbonate. Results : 1) The mean age was 5.3 months old. There were 6 patients with 8 episodes. Six cases had Ornithin transcarbamylase deficiency. The remaining cases are Multiple carboxylase deficiency and Propionic acidemia (Table 1) 2) In 7 cases with hyperammonemia, mean levels of pre and post 24hrs peritoneal dialysis serum ammonia were 1000.2±310.9 ㎍/dl and 388.8 ±156.7 ㎍/dl at 24 hours respectively. Time on serum ammonia levels reached below 300 ㎍/dl was 88.7 ±39.6 ㎍/dl hours. 3) Four out of seven cases were a recorvert of mental status. Each episode of serum ammonia mean levels was 388.8 ±156.7 ㎍/dl after 19.7 ±5.8 hours of peritoneal dialysis (Table 3). 4) Peak serum ammonia levels of the survived group reached 1356.5 ㎍/dl, higher than the expired group of 847.5 ㎍/dl and time period of starting peritoneal dialysis after onset of the survived group was 15.5 hours earlier than the expired group of 23 hours(P>0.05)(Table 4). 5) 3 out of 7 cases of hyperammonemia died. The cause if death were 3 brain edema, 1 hyperkalemla and 1 intracranlal hemorrhage. 6) In onecase with Multiple carboxylase deficiency, serum ammonia level was normalized after 12 hours of peritoneal dialysis. The reduction of serum levels of the branched amino acid was also observed. 7) In a case of Propionic acidemia with severe metabolic acidosis, the prior serum bicarbonate level was 8 mmol/L and was increased up to 18 mmol/L by peritoneal dialysis lasting 19 hours. 8) Among 8 cases, complications of peritoneal dialysis were 5 hypoalbuminemia, 4 hyoercalcemia, 4 hyperglycemia and leakage of peritoneal dialysate. Conclusions : In cases of hyperammonemia, survival rate is 57.1%. They are showed excellant efficacy of treatment of peritoneal dialysis for metabolic crises. In a case of propinic acidemia is fastly corrected by peritoneal dialysis. But unfortunally clinical manifestations is not improved. Therefore, further studies is required with treatment of severe metabolic acidic conditions.

학생들이 사용한 엔진 구동형 Ni-Ti file systems의 근관 성형 효율 비교

강문성,김현철,허복,박정길 大韓齒科保存學會 2006 Restorative Dentistry & Endodontics Vol.31 No.1

본 연구의 목적은 학생들이 사용한 세 가지 Ni-Ti 파일의 성형효율을 비교하고, 각 파일의 사용 경험 유무에 따른 차이를 비교하여 치과대학생을 위한 교육에 적합한 종류를 선택하는데 도움을 얻고자하는 것이다. Ni-Ti 파일 사용 경험이 없는 학생 50명과 Ni-Ti 파일을 사용한 근관치료 경력이 2년 이상인 경험자 10명이 세 종류의 Ni-Ti file - ProFile^(®) (PF), HeroShaper^(®) (HS), K3™ (K3) -을 사용하여 180개의 근관 모형을 성형하였다. 근관성형 시간 및 기구 변형, 근관 이형성을 조사하고 성형 전후 상을 중첩하여 근관 삭제폭, 근관변위량과 중심변위율을 1, 3, 5 ㎜에서 분석하였다. 1. 근관 성형시간은 HS군이 가장 빨랐으며, 총 삭제량은 모든 지점에서 K3군이 다른 군보다 컸다 (P<0.05). 2. 세 군 모두 1, 3 ㎜에서 외측 변이를 보였고, 1 ㎜ 지점에서 PF군이 가장 안정적이었다 (P< 0.05). 3. 중심변위율은 1, 3 ㎜에서 HS, PF군이 K3군보다 작았다. 5 ㎜ 지점에서 PF군이 가장 작았고, PF군 3 ㎜에서 학생은 경험자보다 유의하게 작았다 (P < 0.05). The purpose of this study was to compare the shaping ability of three Ni-Ti file systems used by dental students or the experts and consequently to aid in choosing a proper systems for educational courses of dental students and beginners. Fifty students and ten dentists who have clinical experience over two years prepared 180 simulated root canals in resin blocks with three Ni-Ti systems: ProFile^(®) (PF), HeroShaper^(®) (HS), K3™ (K3). After preparation, the Ni-Ti files were evaluated for distortion and canal preparation time was recorded. The images of pre- and post-instrumented canals were scanned and superimposed. Amounts of increased canal widths,deviation, and centering ratio were calculated at apical 1, 3 and 5 ㎜ levels and statistical analysis was performed. The results were as follows: 1. HS showed the shortest preparation time and instrumented canal width in K3 was significantly larger than other groups (P< 0.05). 2. At 1 and 3 ㎜ levels, all groups had outward deviation. In student group, at the 1 ㎜ level, PF had the least deviation (P< 0.05). 3. In the centering ratio, the PF had the best centering ability compared to the others at 5 ㎜ level. At 1 and 3 ㎜ level, HS and PF had better abilities than K3. Student group had better ratio than the expert at 3 ㎜ level with PF (P<0.05). Based on the results, it is surmised that the ProFile^(®) is the safest and most ideal instrument for students and beginners.〔J Kor Acad Cons Dent 31(1):1-10, 2006〕

치성감염에 의해 발생된 후측인두부 및 종격동 농양

이승호,정종철,김건중,정주성,유선열,박문성,김창룡 大韓顎顔面成形再建外科學會 1996 Maxillofacial Plastic Reconstructive Surgery Vol.18 No.4

Odontogenic infections are usually locally confined, self-limiting processes. However, under certain circumstances, they may break through the bony, muscular, and mucosal barriers and spread into contiguous fascial spaces or planes far from the initial site of involvement, resulting in severn life-threatening complications, such as retropharyngeal spread, suppurative mediastinal extension, airway obstruction, pleuropulmonary suppuration, and hematogenous dissemination to distant organs. The mortality arte for mediastinitis from odontogenic infection ranges from 40% to 60%. Therefore rapid evalution and treatment is essential with a combination of life support, antibiotic therapy, and surgical intervention. Recently, we experienced three cases of retropharyngeal and mediastinal abscesses secondary to odonogenic infections. In all patients, early diagnosis was possible by CT scanning and physical examination. The prognosis was good in all patients by using urgent aggressive surgical and antibiotic therapy.

다층 구조를 이용한 PCS용 위상배열 안테나에 대한 연구

이태윤,장정필,윤영중,문철 연세대학교 산업기술연구소 1996 논문집 Vol.28 No.2

본 논문에서는 PCS 주파수대(1.8~2.0 GHz)에서 사용하기 위한 4-bits 위상천이기를 이용한 다층구조형 슬롯결합 능동 위상배열 안테나를 설계 ·제작하여 그 특성을 고찰하였다. 4-bits 위상천이기는 PIN다이오드를 이용하여 30˚ 및 60˚ 부하선로형 위상천이기와 90˚ 및 180˚ 반사형 위상천이기로 구성되었다. 안테나의 효율 및 대역폭을 개선하기 위하여 슬롯결합형 급전구조를 사용해 방사소자인 4개의 마이크로스트립 구형 패치 안테나와 이에 대한 위상천이기를 서로 다른 기판에 설계하여 -25˚~+25˚까지 빔의 주사를 확인하였다. 다층구조형 슬롯결합 급전구조는 가역정리를 이용한 full-wave모멘트법을 이용하여 해석하였다 . In this paper, the slot-coupled active phased array with the multilayer structures for the PCS frequency band(1.8-2.0GHz) is designed and fabricated by using the 4-bits phase shifters and its operating characteristics are analyzed. The 4-bits phase shifer with PIN diodes consists of 30˚ and 60˚ loaded-line phase shifters and 90˚ and 180˚ reflection type phase shifters. The 4-element microstrip rectangular patch antennas and the phase shifters are printed on the separate dielectric substrates by using the slot-coupled feed structure to improve the bandwidth and the efficiency of antenna. The designed phased array antenna shows the scanning angle in the range of ±25˚ The slot-coupled feed structure on the multilayers in analyzed with the full-wave moment method by using the reciprocal theorem.

스포츠 소비자의 가치관과 스포츠 선호종목의 관계

장호중,김지은,김정묵,정철규,박순문 한국스포츠리서치 2003 한국 스포츠 리서치 Vol.20 No.1

The purpose of this study is to examine the relationship between The Relationship between and Sports Preference Event and Value of Sports consumers. To achieve this purpose, the subjects were selected by cluster random sampling of adults in sports facilities, in Seoul, in 2001 at present. There were 414 male, 360 female used for the analysis. The total was 774. Data were collected by employing a questionnaire. The variables of this analysis were conducted value, sports items, demographic characteristics. The survey questionnaires were used to collect the data. The questionnaire for the formalization factor of a Value of Sports consumers by Kim(1996). The collected data analyzed statistic program SPSS Windows 10.0 Version. The statistical analysis are descriptive statistics analysis, factor analysis, one-way ANOVA, crosstabs, discriminant analysis. Through this process, the study has reached the following conclusions. First, value of sport consumers, sports event, are partly different by demographic characteristics. Second, Value of Sports consumers are influence of Sports Preference Event.

폐기종과 만성기관지염의 흡연습관 차이

문영철 ( Mun Yeong Cheol ),유성근 ( Yu Seong Geun ),박혜정 ( Park Hye Jeong ),신경철 ( Sin Gyeong Cheol ),정진홍 ( Jeong Jin Hong ),이관호 ( Lee Gwan Ho ),이정철 ( Lee Jeong Cheol ) 대한결핵 및 호흡기학회 2001 Tuberculosis and Respiratory Diseases Vol.50 No.6

Metal–Insulator–Semiconductor Diode Consisting of Two-Dimensional Nanomaterials

Jeong, Hyun,Oh, Hye Min,Bang, Seungho,Jeong, Hyeon Jun,An, Sung-Jin,Han, Gang Hee,Kim, Hyun,Yun, Seok Joon,Kim, Ki Kang,Park, Jin Cheol,Lee, Young Hee,Lerondel, Gilles,Jeong, Mun Seok American Chemical Society 2016 NANO LETTERS Vol.16 No.3

<P>We present a novel metal-insulator-semiconductor (MIS) diode consisting of graphene, hexagonal BN, and monolayer MoS2 for application in ultrathin nano electronics. The MIS heterojunction structure was fabricated by vertically stacking layered materials using a simple wet chemical transfer method. The stacking of each layer was confirmed by confocal scanning Raman spectroscopy and device performance was evaluated using current versus voltage (I-V) and photocurrent measurements. We clearly observed better current rectification and much higher current flow in the MIS diode than in the p-n junction and the metal-semiconductor diodes made of layered materials. The I-V characteristic curve of the MIS diode indicates that current flows mainly across interfaces as a result of carrier tunneling. Moreover, we observed considerably high photocurrent from the MIS diode under visible light illumination.</P>

Synthesis of Superconductor $YBa_{2}Cu_{4}O_{8}$ by Pyrolysis of EDTA Complex

Jeong Cheol-Mo,Mun Seung-Ho,Kang Cheol-Hwa,Lee Cheol-Eui,Yom Sang-Seop,Kim Keon Korean Chemical Society 1992 Bulletin of the Korean Chemical Society Vol.13 No.6

The superconducting $YBa_2Cu_4O_8$ was synthesized in oxygen condition at 1 atm. The starting material with 1 : 2 : 4 composition was obtained by pyrolysis of EDTA complex, which was converted to 1-2-3 phase during densification, followed by the 1-2-4 phase recovery at $810^{\circ}C$ . The phase presents were identified by XRD, TG, DTA and AC magnetic susceptibility. Our data indicated that considerable amounts of 1-2-4 phase formed but with the 1 : 2 : 3 phase or possibly 2-4-7 as visible. As the P($O_2$) increased with temperature, impurity peak, CuO ($2{\Theta}$ = 38.8), gradually decrease, and we conclude that the 1-2-4 phase is predominant bulk superconductor under the high oxygen pressure.