치아 석회화과정과 골성숙단계의 상호연관성에 관한 연구

차대식,차경석 대한치과교정학회 1994 대한치과교정학회지 Vol.24 No.4

This study was conducted on 342 patients(male 157,female 185)aged 8 to 15 years old, who visited Dankook University Dental Hospital. Pre-orthodontic treatment orthopantomograms were used to assess the dental calcification stages of mandibular 3rd molar, 2nd molar 2nd premolar and lst premolar by 8 stages.(by Demirjian) Hand-wrist radiogrms were used to evaluate the skeletal maturity in 11 stages.(by Fishman) Following results were obtained after investigating the correlationship between dental calcification and skeletal maturity. 1. Chronologic age showed high correlation to dental calcification and skeletal maturity. 2. Dental calcification and skeletal maturity showed high correlation and no statistical difference was observed between male and female. 3. SMI stages 1 to 4 showed high statiscal significance to mandibular 2nd molar, 2nd premolar and 1st premolar. SMI stages 5 to 8 showed high stastical significance to mandibular 2nd molar, 2nd premolar. SMI stages 9 to 11 showed high statistical significance to mandibular 3rd molar.

열형광선량계에 관한 연구

채건식,김영국,손인호,노경석 경남대학교 신소재연구소 1995 論文集 Vol.5 No.-

본 연구에서는 CaSO₄에 활성체로 전이원소인 Tm, Dy, V, Mo을 첨가하여 CaSO₄ : Tm, Dy, V, Mo 열형광에를 제작하였다. 주 peak는 불순물의 농도와 온도에 따라 CaSO₄ : Tm, Dy, V, Mo의 열형광 glow curve에서 구하였다. 활성화에너지는 peak shape 법으로 구하였는데 각각의 불순물에서 1.5eV, 1.25eV, 0.8eV, 1.17eV를 얻었다. 그리고 CaSO₄: Tm, Dy, V, Mo 열형광체는 peak shape 법으로 분석해 본 결과가 모두 2차 발광이었다. CaSO₄: V, Mo 열형광체가 X-선에 가장 감도가 좋았으며, 1-100 Rad의 X-선을 조사하였을 때 열형광감도는 선량의존성을 보였다. The principle of dose measurement by thermoluminescent dosimeter(TLD) was investigated. CaSO₄:Tm. Dy. V. Mo thermoluminescent phosphor has been prepared by sintering the CaSO₄after doping the transition elements Tm, Dy. V. Mo. The maximum peaks are found in the measured CaSO4 Tm. Dy. V. Mo TL glow curve at impurity mol% and annealing temperature. The activation energy of main peak has been estimated by the peak shape method. The estimated activation energies are 1.5 eV. 1.25 eV. 0.8 eV. and 1.17 eV. respectively. The thermoluminescence process in CaSO₄: Tm. Dy. V. Mo are found t o the 2nd order when the main peak of the glow curve is analyzed by the peak shape method. CaSO₄: V. Mo thermolunescent phosphor is the most sensitive to X-rays among the other materials. The dose responses of CaSO₄: Tm. Dy. V. Mo TLD are linear up to 1 - 1000 Rad of X-rays.

교육사회학의 연구 동향 분석

김경식,권민석,김병규,박형진,송승면,황정희 경북대학교 사범대학부속 중등교육연구소 2005 중등교육연구 Vol.53 No.3

한국, 일본, 미국, 영국의 교육사회학 학술지 논문을 주제별 내용분석을 통해 각각의 하위개념을 도출하고 개념의 유사성의 정도에 따라 다시 상위개념으로 분류하여 교육사회학의 주요 연구영역을 탐색하였다. 학술지에서 가장 많이 다루어진 영역은 교육과 평등/지위획득, 교육정책과 제도, 교육사회학의 성격/이론, 학교사회와 학업성취, 페미니스트(여성), 청소년 문제와 문화, 교사교육/교직사회, 공교육의 문제/교육개혁 등의 순으로 나타났다. 특히 교육정책과 제도 문제는 한국과 일본에서, 교육사회학의 발달과 정체성 문제는 영국에서, 학업성취 관련 내용은 미국에서 가장 많이 다루어졌다. The purpose of this study was to explore the research trend in sociology of education. To conduct the purpose of this study, the Korean Journal of Sociology of Education(KJSE), the Journal of Educational Sociology(JES), Sociology of Education(SOE), and Bitish Journal of Sociology of Education(BJSE)'s articles were analyzed. The findings of this study were as follows: First, though the major categories(major domains) of research areas were a few differences among nations, they were education & equality, educational policy, sociology of education theory, school society & academic achievement, feminism, adolescent problem & culture, teacher education, school crisis & education reform, course education, sociology of curriculum, and etc. Second, the most frequent research area was the educational policy & system problems in Korea and Japan; the development and identity of sociology of education in Britain; The school society & academic achievement in U.S.A.

Mg₂SiO₄: Tb, Nd, Dy 열형광선량계에서 활성제 농도가 Glow Curve에 미치는 영향

노경석,채근식,오재근,김영국,이은숙,설정식,손인호 慶南大學校 附設 基礎科學硏究所 1996 硏究論文集 Vol.8 No.-

The Mg₂SiO₄: Tb, Nd, Dy thermoluminescent phospher has been prepared by sintering Mg₂SiO₄after doping the transition elements Tb, Nd and Dy. The heating rate is 10℃/sec at this thermoluminescent phospher are heated. From the results of this study, the following conclusions were obtained. The maximum peaks are found in the measured Mg₂SiO₄: Tb, Nd, Dy, and TL glow curve at 289℃, 252℃ and 220℃ when the 1wt.% ∼ 5wt.%. Glow curve of TLD increased TL intensity and temperature of peak appears to the high temperature when the heating rate is 10℃/sec∼25℃/sec. The activation energy of the main peak has been estimated by the peak shape method. The estimated activation energies are 1.26 eV, 0.53 eV and 0.80 eV respectively. The thermoluminiscence process in Mg₂SiO₄: Tb, Nd, Dy are found to the 2nd order when the main peak of the glow curve is analyzed by peak shape method. The Mg₂SiO₄: Tb thermoluminescent phosphor is the most sensitive to X-rays among the other materials. The dose responses of Mg₂SiO₄: Tb, Dy TLD are linear up to intensity of X-ray.

Angle씨 Ⅲ급 부정교합자의 Activator치료 전후 head posture변화에 관한 연구

서형식,차경석 대한치과교정학회 1994 대한치과교정학회지 Vol.24 No.2

This study was carried out to research the adaptation patterns of head posture after activator therapy in functional class Ⅲ malocclusion patents. For this purpose, 29 functional class Ⅲ malocclusion patients, from the ages of 8 to 13 years old, were used. 1. Increse in capacity of oral cavity capacity were found in all the samples, but craniocervical angulation were varied into incresed group and decreased group after therapy. 2. Head posture exhibited the compensatory adaptation in the relative growth increments of the vertical dimension, ALFH and PLFH. 1) A group with more PLFH and less sagittal angle showed relatively small growth increment in PLFH during the treatment period, thus craniocervical angulation was increased. 2) A group with less PLFH and more sagittal angle showed relatively great growth incrmenet in PLFH during the treatment period, thus craniocervical angulation was decreased.

경피적 담낭루 설치술의 안전성과 유용성 : 해부학적 접근경로 및 시술방법을 중심으로 Evaluation of Complication with Regard to the Access Route and Technique

신경숙,조준식,신병석 충남대학교 의학연구소 2003 충남의대잡지 Vol.30 No.2

Our purpose was to evaluate the safety and feasibility of percutaneous cholecystostomy with regard to access route(transperitoneal vs transhepatic) and technique in patients of acute cholecystitis. In 139 consecutive patients(80 male, 59 female mean age; 67years) with acute cholecystits, medical records about percutaneous cholecystostomy (approach route, technique, used device and complication) were reviewed, retrospectively. In all patients, the procedure were performed under ultrasound guidance for GB puncture and fluoroscopy control for catheter manipulation. In 136 of 139 patients, percutaneous cholecystostomy was technically successful (98%). In three cases, successful second trial after initial failure was performed. The procedure was performed by meansof a transhepatic(n=63) or a transperitoneal(n=76) access route. During procedure, seldinger technique was performed(transhepatic approach, n=63, transperitoneal approach, n=62) in 125 patients, while in the remaining 14 patients the procedure were performed using troca technique with transperitoneal approach. Chiba needle(20G, MDtech, Denmark, n=22), JELCO needle(16G, Johnson & Johnson, USA, n= 67), Secalon catehter(16G, Ohmeda, UK, n=36) were used for initial puncture of GB. Only minor complications such as abdominal pain(n=16), hemorrhage(n=2), referred pain(n=4) occurred in 21cases(15%). Abdominal pain is more frequent in transhepatic approach(18%) than in transperitoneal approach(7%), but not statistically significant(p=0.061). Overall complication rate is lower in transperitoneal approach(8B) than in transhepatic approach(24%)(p=0.016). According to puncture needle, there is no significant difference in complication rate between Chiba needle(18%) and 16G needle(Jelco needle and Secalon catheter, 16%). In Conclusion, percutaneous cholecystostomy has proved to be safe and effective treatment for patients with acute cholecystitis.

진행위암의 수술전 병기결정에서 문맥기 나선식 CT의 유용성 : Usefulness of Helical CT during the Portal Venous Phase

조준식,신경숙 충남대학교 의과대학 지역사회의학연구소 1998 충남의대잡지 Vol.25 No.2

The purpose of this study was to evaluate the effect of helical CT during the portal venous phase after oral ingestion of water in the preoperative staging of advanced gastric carcinomas. Of the patients underwent helical CT scanning for preoperative staging of gastric carcinoma, 70 patients with pathologically proved advanced gastric carcinomas were selected in this study. The patients ingested 600-800m1 of water as a oral contrast agent before CT scanning. A total 130150ml of nonionic contrast material was administered at the rate of 4ml/s. We obtained portal venous phase images at 60 s and equilibrium phase images at 3 min after the start of bolus administration of intravenous contrast material. Two-phase CT findings were prospectively evaluated and correlated with histopathologic findings according to TNM classification. The primary tumors were detected on CT scans in 69 (98.5%) of 70 cases. The accuracy of CT for T staging was 74.3% (52 of 70 cases). T staging was understaged in 13 cases (18.6%) and overstaged in five (7.1%). The accuracy for N staging was 67.1% (47 of 70 cases). N staging was understaged in 16 cases (22.9%) and overstaged in seven (10%). Our results suggest that helical CT during the portal venous phase can improve the accuracy of CT in the preoperative staging of advanced gastric carcinomas.

전압제어 GIC를 이용한 대역 및 고역통과 필터의 특성 비교

송명석,노경호,김왕식,박종연 강원대학교 정보통신연구소 2004 정보통신논문지 Vol.8 No.-

In this paper, we have presented comparative characteristics of band-pass filter and high-pass filter using VCGIC(Voltage Controlled Genenalized Impedance Converter), which are the non-linearized VCR(Voltage Controlled Resistance) and the linearized VCR. We concluded that the linearized VCGIC circuit has the wide dynamic range and the improved linearity.

토끼 눈물샘에서 Nitric Oxide Synthase의 면역조직화학적 연구

박경호,이석호,고정식,안의태,박대균 순천향의학연구소 2004 Journal of Soonchunhyang Medical Science Vol.10 No.1

Endogenous nitric oxide(NO) has been known to regulate many physiological and pathological process, especially the salivary secretion and glandular blood flow. However, nitric oxide synthase(NOS) responsible for NO synthesis has not been well studied in rabbit lacrimal gland. The present study was performed to investigate the distribution of nitric oxide synthase isoforms(endothelial, neuronal, and inducible NOS). Immunohistochemistry, using monoclonal mouse anti-endothelial NOS, anti-neuronal NOS, and anti-inducible NOS, was performed in inferior lacrimal of the rabbit. Endothelial NOS(eNOS)-positive immunoreactivities were observed in arterial endothelia, intralobular ducts and interlobular ducts of the inferior lacrimal gland of the rabbit. eNOS-positive immunoreactivities were most prominent in the interlobular and intralobular ducts. Immunoreactivities were well concentrated in cytoplasm of columnar epithelial duct cells. However, weak eNOS-positive immunoreactivity was observed in the intercalated ducts and vascular endothelial cells. Neuronal NOS(nNOS)-positive immunoreactivity was seen in the nerve fibers of inferior lacrimal gland. nNOS-positive immunoreactivy was not detected in duct systems or in acinar cells. Inducible NOS-positive immunoreactivity was not seen. Especially, the expression of the nNOS in the nerves of lacrimal gland suggest that NO may play a role in modulating tear production. These results reveal the presence of eNOS and nNOS in the lacrimal gland of the rabbit, which may be related with regulation of the glandular secretion and blood flow through the gland.

위에 생긴 이소성 췌장의 진단에 있어 경구 조영제로 물을 사용한 후 조영증강 역동적 CT의 가치

조준식,신경숙 충남대학교 의과대학 지역사회의학연구소 1997 충남의대잡지 Vol.24 No.2

To describe the usual and unusual CT findings of heterotopic pancreatic of the stomach and to evaluate the usefulness of dynamic contrast-enhanced CT with water as an oral contrast agent in diagnosing heterotopic pancreas We retrospectively reviewed CT findings in 10 patients with pathologically proved gastric heterotopic pancreas by operation (n=9) or endoscopic resection (n=1). In three patients, conventional CT with diluted Gastrografin solution as an oral contrast agent was performed. In seven patients, two-phase dynamic CT scans after ingestion of 600-800 ml of water were obtained in the early phase and equilibrium phase. Dynamic CT findings of heterotopic pancreas were correlated with histopathologic findings. All 10 heterotopic pancreatic rests were detected with conventional CT or dynamic CT. In seven cases who underwent dynamic CT after ingestion of water, highly enhanced mucosal layers overlying the lesions were identified and all lesions were well delineated in the submucosal layer In four of these seven cases, heterotopic pancreas showed high enhancement similar to that of adjacent normal pancreatic enhancement in the early phase of dynamic CT. The usual CT findings of gastric heterotopic pancreas were oval-shaped submucosal masses (<3cm) in the gastric antrum. The unusual CT findings were infiltrating heterotopic pancreas into the muscle layer in one, cystic dilatation of heterotopic pancreatic ducts in two, and malignant change with mucin secreting cystadencoarcinoma in one. Gastric heterotopic pancreas usually showed oval-shaped submucosal masses (<3cm) in the gastric antrum with high enhancement similar the that of pancreatic enhancment in the early phase of dynamic CT. Our results suggest that contrast-enhanced dynamic CT after ingestion of water may be helpful in diagnosing gastric heterotopic pancreas.