외상성 간손상과 비장손상시 CT분류의 의의

정준영,이창현,김현정,도호석,이삼범,도병수 大韓應急醫學會 1997 대한응급의학회지 Vol.8 No.1

The Organ Injury Scaling Committee of the American Association for the Surgery of Trauma recently published a consensus classification of hepatic and splenic injuries. The hepatic and splenic injury scales, based on parenchymal laceration and intrahepatic hematoma, include grade 1 to 6 and grade 1 to 5 respectively, representing the least to most severe injury. Forty-eight patients with hepatic and splenic injury were evaluate by abdominal CT from January 1995 to May 1996 and we compared abdominal CT grading with operative grading. Four CT grades did not correlate with operative finding. CT grading showed a sensitivity of 80%, specificity 80% in regard to operative grading. We conclude that 1) CT is an accurate technique to determine the extent of hepatic and splenic injury. 2) CT grading of hepatic and splenic trauma has a high correlation with operative grading.

급성흉통으로 내원한 환자에서 심근경색증을 조기 발견하기 위한 TROP-T?Rapid Assay의 유용성

정준영,이창현,김현정,도호석,이삼범,도병수 대한응급의학회 1996 대한응급의학회지 Vol.7 No.2

Study Objectives : In the past, measurement of cardiac enzymes(i.e. CK and/or CK-MB, GOT, LDH)and myoglobin, cardiac specific serum troponin-T were widely used for the diagnosis of acute myocardial infarction, but it need a long time and have low specificity. Thus new diagnostic modality, TROP-T?? Rapid Assay, is very easy and rapid qualitative methods, is needed for the early detection of acute myocardial infarction. Methods : Total CK, GOT, LDH, myoglobin and serum troponin-T activities were measured in patients presenting with acute chest pain at the emergency department and at the same time TROP-T? Rapid Assay was done. Final diagnosis and diagnostic usefulness was evaluated. Results : Overall diagnotic sensitivity and specificity of initial results were as follows; TROP-T? Rapid Assay, 77.3, 100.0; myoglobin, 63.6, 70.4; CK, 95.5, 96.3; GOT, 86.4, 96.3; LDH, 90.9, 92.6; serum troponin-T, 86.4, 96.3, respectively. Conclusion : The TROP-T?? Rapid Assay is simple method and has a short time and nearly same sensitivity and specificity compared to other cardiac enzymes. Thus this is considered useful method in the early detection of acute myocardial infarction at emergency department.

SrTiO₃ 박막의 유전특성에 미치는 Ti층의 영향

정천옥,김병인,김창석 조선대학교 에너지.자원신기술연구소 2001 에너지·자원신기술연구소 논문지 Vol.23 No.2

This study makes SrTiO₃with nonpolarity among ferroelectrics by RF sputtering as dielectric layer, produces thin film of Si+SrTiO₃and Si+Ti+SrTiO₃of MOS structure using Ti as buffer layer, measures and examines the electrical features with optical refractive index, absorption coefficient, electric permittivity, photon energy and as a result, ferroelectrics oscillation occurrs by the interaction within a film by light temperature and the absorption coefficient of thin film with Ti as buffer layer is increased. It is found that the peak of electric permittivity value of Ti+SrTiO₃thin film has low values and is appeared late and as dipole which is found in dielectric is shown, the experiment satisfies the theory. In the nature of electric permittivity by photon energy, imaginary value is higher and current variation slope of thin film of thickness SrTiO₃has lower values in reverse bias.

광자에너지에 의한 TiN-Oxide 박막의 유전율 특성

정천옥,김병인,김창석 조선대학교 에너지.자원신기술연구소 2001 에너지·자원신기술연구소 논문지 Vol.23 No.2

VLSI require thinner dielectric film and also larger capacitance. Most of such VLS I have MOS structures. For the research on this requirement, MOS capacitors were fabricated on the silicon wafer in four different thickness groups by RF sputtering method and investigated on their electrical and optical characteristics by photon energy variation. SiO film is used as the insulating layer and TIN film is chosen as the barrier against the diffusion of Al which is the terminal connected by ohmic contact because TIN has the advantageous properties such as good thermal stability and very low diffusion rate in spite of it's relatively low specific resistance.

일정축력 및 반복 횡하중을 받는 철골철근콘크리트 기둥의 내력과 변형성능

정수영,연길환,임경택,윤석천,한병찬 忠南大學校 産業技術硏究所 1995 산업기술연구논문집 Vol.10 No.2

An experimental investigation was conducted to investigate the strength and deformation capacity of Wide Flange Steel Encased Reinforced Concrete(SRC) Columns subjected to constant axial compression and cyclic lateral loading conditions. Six one-third scale specimens were tested, each consisting of a structural steel size encased in reinforced concrete. The parameters studied in the test program included the effects of B/t ratios of encased steel(=13, 18, 23), ratios of axial force(=1/3, 1/6). As a result, capacity prediction based on superimposing the moment-axial-load interaction surfaces of the steel shape and reinforced concrete produced good results; the average of the experimental-to-predicted capacity ratio being equal to 0.99∼1.20. The observed hysteretic behavior of the test specimens indicated that adequated ductility can be achieved and the concrete core must be inhibited to buckling of wide flange.

2인과 3인의 기본 심페소생술 비교

정준영,이창현,김현정,도호석,이삼범,도병수 大韓應急醫學會 1997 대한응급의학회지 Vol.8 No.1

Study objectives: To compare the quality of CPR provided by medical students and pre-EMTs perfoming three-rescuer CPR with that achieved by same students trained to provide standard two-rescuer CPR and to find the most effective method of resuscitation and to educate this methods to students. Material and methods: From July 1 to September 30, 1996, we had trained 60 groups consisted of the medical students, students of EMS technology and pre-EMT. Each group practiced two-rescuer CPR and three-rescuer CPR for 120 minutes with Resusci? Anne and perfomed CPR for at least 3 minutes without feedback. To eliminate any visual cues of perfomance the mannequin's recorder was hidden. Each actions were recorded by Resusci? skillmeter and Laerdal printer. To compare the quality of two-rescuer CPR and three-rescuer CPR, we analyzed the data by SPSS with paired t-test. Results: Three-rescuer teams delivered a mean minute ventilation and a mean minute cardiac compression substantially greater than that produced by two-rescuer teams(11.30±1.85 vs 9.09±2.22, p<0.001; 99.22±12.42 vs 95.12±15.75, p<0.001). Three-rescuer teams produce the more correct actions in chest compression and ventilation(93.84±7.56% vs 83.49±16.94%, 90.90±9.33% vs 77.00±17.06%). Conclusion: Three-rescuers can produce better CPR than two rescuers when a bag-valve-mask devices is used and the technique is easily learned and readily retrained, so we think that repeated education and training of this CPR methods to students is needed.

SrTiO_3 박막의 유전특성에 미치는 Ti층의 영향

정천옥,김병인,김창석 조선대학교 동력자원연구소 1997 動力資源硏究所誌 Vol.19 No.1

This study makes SrTiO₃ with nonpolarity among ferroelectrics by RF sputtering as dielectric layer, produces thin film of Si/SrTiO₃ and Si/Ti/SrTiO₃ of MOS structure using Ti as buffer layer, measures and examines the electrical features with optical refractive index, absorption coefficient, electric permittivity, photon energy and as a result, ferroelectrics oscillation occurrs by the interaction within a film by light temperature and the absorption coefficient of thin film with Ti as buffer layer is increased. It is found that the peak of electric permittivity value of Ti/SrTiO₃ thin film has low values and is appeared late and as dipole which is found in dielectric is shown, the experiment satisfies the theory. In the nature of electric permittivity by photon energy, imaginary value is higher and current variation slope of thin film of thickness SrTiO₃ has lower values in reverse bias.

광자에너지에 의한 TiN-Oxide 박막의 유전율 특성

정천옥,김병인,김창석 조선대학교 생산기술연구소 1997 生産技術硏究 Vol.19 No.1

VLSI require thinner dielectric film and also larger capacitance. Most of such VLSI have MOS structures. For the research on this requirement, MOS capacitors were fabricated on the silicon wafer in four different thickness groups by RF sputtering method and investigated on their electrical and optical characteristics by photon energy variation. SiO film is used as the insulating layer and TiN film is chosen as the barrier against the diffusion of Al which is the terminal connected by ohmic contact because TiN has the advantageous properties such as good thermal stability and very low diffusion rate in spite of it's relatively low specific resistance.

SiO/TiN 박막의 증착두께에 따른 유전율 특성

김창석,이우선,정천옥,김병인 조선대학교 에너지.자원신기술연구소 2001 에너지·자원신기술연구소 논문지 Vol.23 No.2

In these days, the thinner film of dielectric materials is required while it's capacitance is required to be still large at the VLSI process. Most of such VLSI have MOS structures. For the research on this requirement, MOS capacitors were fabricated on the silicon wafer in four different thickness groups by RF sputtering method. SiO of the SiO/TiN film is used as the insulating layer and TIN is chosen as the barrier against the diffusion of Al which is the terminal connected by ohmic contact because TIN has the advantageous properties such as good thermal stability and very low diffusion rate in spite of it's relatively low specific resistance. In this study their electrical and optical characteristics are investigated to find refractive index, absorption coefficient and Permittivity.

흰쥐의 발치아에 이식된 태아 치아싹의 발육

최병재,장석철,정한성,이제호,김성오 大韓小兒齒科學會 2006 大韓小兒齒科學會誌 Vol.33 No.1

정상적인 치열의 형성 및 치아의 생성과정을 분석하고 실제로 임상에 적용하기 위해 치아의 발생과정을 연구하는 것은 매우 중요하다. 본 연구는 이식된 태아 치아싹의 석회화가 가능하고 정상적인 구조로 발육할 수 있는지 밝히기 위해, 그리고 악골 자체가 새로운 이식 공여부로 사용가능한지 알기 위해 흰쥐의 발치와에 치아싹을 이식하여 치아의 형성을 살펴보고자 하였다. 이를 위하여 성숙한 흰쥐의 상악 제 1구치를 발거한 발치와에 13.5일된 태아쥐의 치아싹을 이식한 후 4,8주 후에 희생하여 조직학적 및 방사선학적으로 관찰하여 다음과 같은 결과를 얻었다. 1. 이식된 치아싹에서 상아질과 백악질, 치수, 치주인대의 소견을 갖는 석회화된 조직이 형성되었다. 2. 형성된 경조직 및 연조직은 정상적인 치아형성과정에 비해 발육이 늦었으며 유착 및 골양상아질(osteodentin)과 같은 비정상적 조직이 관찰되었다. 3. 석회화된 조직은 8주내에 악궁으로 맹출하는 소견이 관찰되지 않았다. The developmental process of a tooth is being presented as an important study subject to analyze formation of normal dental arch and tooth. The purpose of this study was to see the formation of tooth from a tooth bud transplanted in a white rat regarding that the jawbone could be used as a new donor site of a trasplant. The first molar of a matured white rat was extracted and the tooth bud of a 13.5 day rat embryo was transplanted. The histological and radiographical results after 4 and 8 weeks respectively are as the following. 1. Calcification in dentin, cementum, pulp and periodontal ligament was formed from the tooth bud transplanted in the alveolar socket. 2. The development of hard and soft tissue was delayed compared to the normal tooth formation and abnormal histologic features such as ankylosis and osteodentin were found. 3. The formed hard tissue did not erupt into the jaw within 8 weeks.