자기공명영상용 라디오주파수 코일의 제작에 있어서 동조 및 매칭에 영향을 미치는 전기 용량 값들의 실험적 측정

양경승,신용진,김영섭,한재진,이성길,김승국,김영근,지연상 조선대학교 기초과학연구소 2003 自然科學硏究 Vol.26 No.-

Radio frequency coil which is capable of transmit and receive the signal has been used for image production in magnetic resonance imaging(MRI). Tuning and matching characteristic of radio frequency coil is major factor determining the image quality. In experiment the used coil was called a staircase type coil which is simplified the birdcage coil and referred to a simple LC resonant circuit. Because the inductance values of the coils are fixed coil performance was examined by changing of the capacitance values. In this study capacitance values were experimentally determined to increase of-tuning and matching effect in junction of the coil between coil endring and BNC cable to obtain the high quality of image.

만성폐쇄성 폐질환 환자에서 적혈구 항산화효소의 변화

국기용,이만재,조희충,임영국,박일,김원식,이승일,이병래 朝鮮大學校 附設 醫學硏究所 1993 The Medical Journal of Chosun University Vol.18 No.1

Toxic oxygen free radicals have been implicated as important pathologic mediators in many clinical disordesrs. Enhandng the intracellular content of antioxidant enzymes can provide means of limiting biological damage caused by oxygen free radicals. Many investigations have examined the potential of various oxyradical scavengers to modulate oxyradical injury. The oxygen free radicals play a role in the pathogenesis of chronic obstructive pulmonary disease. To investigate the pulmonary oxyradical injury and the protective role of antioxidant enzymes, author measured the amount of thiobarbituric acid reactants, the activiteies of antioxidant enzymes (superoxide dismutase, glutathione peroxidase, and catalase) and the sulfhydryl groups in serum and red blood cells from the chronic obstructive pulmonary disease groups and the normal controls. The thiobarbituric acid reactant in chronic obstructive pulmonary disease groups was increased than the controls in both serum and red blood cells, and the superoxide dismutase activity in red blood cells was no statistically difference in both groups. But, the glutathione peroxidase and catalase activities were lowered in chronic obstructive pulmonary disease groups than the controls. The sulfhydryl groups in serum and red blood cells were no statistically difference in both groups. These results suggest that the increased thiobarbituric acid reactant in chronic obstructive pulmonary disease groups mean oxygen radical toxicity, and the decreased glutathione peroxidase and catalase activities may play a role in cellular injury.

연령증가에 따른 흰쥐 삼차신경절 및 삼차신경감각핵에서의 Neuropeptide Y 면역반응세포의 분포에 관한 연구

김명국,백기석,이승표 대한해부학회 1996 Anatomy & Cell Biology Vol.29 No.6

응급센터에서 기관내 삽관을 시행하지 않은 호흡곤란 환자의 동맥혈 이산화탄소분압과 호기말 이산화탄소분압의 연관성분석

김형국,박승현,오동렬,박규남,이원재,황두영,최승필,이운정,정시경,김세경 大韓應急醫學會 1998 대한응급의학회지 Vol.9 No.4

Background: The end-tidal carbon dioxide tension(ETCO₂) is defined as a partial pressure of carbon dioxide at the end of an exhaled breath. The purpose of this study is to determine the correlation between ETCO₂and arterial carbon dioxide tension(PaO₂) in nonintubated patients with respiratory distress in emergency department(ED). Methods: A prospective non-blind study was performed in ED of our university hospitals. Participants included all nonintubated adult patients with respiratory distress requiring arterial blood gas analysis. ETCO₂was measured with a capnography monitor during tidal volume breathing. ETCO₂were recoreded at the time of arterial blood gas sampling. The correlation between ETCO₂and PaCO₂was analyzed in all patients and in subgroups by simple linear regression. Results: Sixty patients were enrolled. In all patients, ETCO₂was 5.72mmHg lower than PaCO₂and correlated well with PaCO₂(r²=0.716). ETCO₂correlated best with PaCO₂in patients who were either acidotic or non-smoking. Conclusion: ETCO₂correlate well with PaCO₂in nonintubated patients with respiratory distress in ED. ETCO₂may be sufficient to reflect PaCO₂in selected patients and obviate the need for repeat arterial blood gas determination.

암환자 분포의 비교분석

김승국,지연상 광주보건대학 2002 論文集 Vol.27 No.-

This paper is based on the records of researching the patients with cancer in the Chunnam National University Hospital from January 1996 to December 2000 and referred to records of the Headquarters of Korea Central Cancer Registory, Ministry of Health and Welfare, Republic of Korea and National Cancer Center. The results are as the following: 1. Among the total O.P.D 4,246,293 the patients of therapeutic radiology are 136,324 in 3.21% 2. Among the 9,329 cancer patients, stomach cancer patients are 1,480(15.86%), liver cancer patients are 1,227(13.15%), lung cancer patients are 1,079(11.57%). Sexual ratio of male to female appeared 1.45:1. Therefore, male cancer patients are more than female patients. 3. The age distribution of cancer was 2,968(31.81%) by 55∼64 age, 2,172(23.28%) by 65∼74 age, and 1,715(18.38%) by 45∼54age. Therefore, above the 70% of all cancer patients were 45∼75 ages. 4. Among the 9,815 therapeutic radiology patients, 1,755(17.89%) are in the uterus system, 2,772(23.7%)are in the head and neck, 1,519(15.48%) are in the lung. Therefore, the proportion of three kinds of therapeutic radiology patients is about 50%. 5. The occupational distribution of 9,329 cancer patients(95∼2000 year) are 2,181(23.28%) by house wives, 2,165(23.21%) by orderly farmers, 380(4.07%) by businessmen, and 314(3.37%) by salary men. Miners, forest men and soldiers didn't nearly appear. 6. The number of patients of cancer diagnosis 6,862(73.56%) was by the biopsy of primary region, and 1,842(19.74%) by clinical examination. Therefore, those two kinds of methods took a proportion of about 94%. From 1996, the number of deceases in GI, PD has been increasing continuously. The total number in GI was 57(28.64%), in PD was 54(27.14%), and in GS was 11(5.53%). Therefore, those three kinds of deceases took a proportion of about 60%.

카톨릭의과대학 부속산업재해병원

유병국,윤임중,이승한 가톨릭대학산업의학센타 산업의학연구소 1979 韓國의 産業醫學 Vol.18 No.1

For the purpose of obtaining reference materials which may be applied to diagnosis of lead poisoning and absorption by D-penicillamine chelation technique, 4-hour fractionated urinary lead excretion was determined under various dosage schedule on 90 lead workers who were either heavily exposed to or intoxicated with lead. The observation groups consisted of nine groups of ten persons and each group was administered 200㎎, 300㎎ or 400㎎ of oral D-penicillamine, either once daily, twice daily at 12-hour intervals or thrice daily at 6-hour intervals. The resulls were as follows: 1. 24-hour urinary lead excretion increased by 2.3 to 6.0 times after daily oral D-penicillamine of 200∼1,200㎎ as compared with initial excretion. 2. 4-hour fractionated urinary lead excretion reached plateau usually within 0-4 hours after each dose of D-penicillamine, though frequently plateau was observed in 4-8 hour period with single doses of D-PCA. 3. 4-hour fractionated urinary lead excretion showed close association showed close association with initial lead excretion only when three doses of 400㎎ D-penicillamine were administered at 6-hour intervals. No association was noted with initial blood lead, urinary coproporphyrin or δ-amino-levulinic acid levels. 4. Determination of lead in third period 4-hour fractionated urine after 2 doses of 400㎎ D-penicillamine given at 6-hour intervals seems most helpful for diagnosis of lead poisoning and absorption.

건축설계 프로세스별 협력설계 의사결정 지원모델 구성 방안

오승준,신창현,이경국,전재열 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1

In Korea construction project case, architectural construction project is curtailed production because information network process within multidisciplinary isn't smooth. Particularly, the construction is not insufficient about performance, cost and material, construction process, etc. in result various question arises because of design error in construction step. And various mistake is made because communication path within multidisciplinary isn't smooth in architectural design and design change process. Therefore The final object of this study is to propose the establishment method of decision support model for the cooperative design in order to provides improved design coordination and optimize the building system.

고속 밀링 주축용 자기베어링 시스템의 디지털 제어기 설계

노승국,경진호,박종권 한국공작기계학회 2004 한국공작기계학회 춘계학술대회논문집 Vol.2004 No.-

The demand of high speed machining is increasing because the high speed cutting provides high efficiency of process, short process time, improved metal removal capacityand better surface finish. Active magnetic bearings allow much high surface speed than conventional ball bearings and therefore greatly suitable for high speed cutting. The automatic control concept of magnetic bearing system provides ability of intelligent control of spindle system to increase accuracy and flexibility by means of adaptive vibration control. This paper describes a design and development of a milling spindle system which includes built-in motor with power 5.5 kW and maximum speed 70,000rpm, HSK-32C tool holer and active magnetic bearing system. Magnetic actuators are designed for satisfying static load condition. The Performances of manufactured spindle system was examined for its static and dynamic stiffness, load capacity, and rotational accuracy. This spindle was run up to 70,000rpm stably, which is 3.5 million DmN.

賃金制度의 運用實態에 관한 考察

辛承國 龍仁大學校 1995 용인대학교 논문집 Vol.11 No.-

This article's objectives is to analyze the operating conditions of wage system that is included the types of increasing wage, annual wage tirade system, determinant factors of increasing wage, wage structure and wage trend according to age, sex with aims for establishing rational personnel system and accomplishing organization's objectives to enhance firm's competitive power. The major contents is showed three parts as follows I. Introductions II. The operasting conditions of wade system 1. The types of increasing wage and the system of annual wage grade 2. The determinant factors of increasing wage 3. The wage structure and wage trend per demographic factors III. Summary and conclusions In conclusion, there is much deviations between employee and management about personnel system including wage system Accordingly, personnel system should be reflected devices to diminish nutual deviations and adapt firm's environments and consider our traditional thoughts in order to enhance Business effectiveness and employee's motivation.

3축 마이크로 공작기계용 자기예압 공기베어링 스테이지의 정, 동적 특성

노승국,Kornel F. Ehmann,Yoon, Hyung-Suk,박종권 한국공작기계학회 2005 한국공작기계학회 춘계학술대회논문집 Vol.2005 No.-

In this paper, the static and dynamic stiffness of the air bearing stage for micro-micro machine tool are examined experimentally. For stiffness and precision concerns, air bearing stages are adapted for 3-axis micro-milling machine which is size of 200x200 mm². The air bearings in the stage are preloaded by permanent magnets to achieve desired bearing clearance and stiffness for vertical direction. As the stiffness of the air bearing is primary interests, static stiffness test were performed on XY stage in Z direction and Z column in Y direction. Dynamic test were performed on XY stage and Z column, respectively. Both static and dynamic tests were performed in different air pressure conditions. The vertical stiffness of XY stage is about 9N/μm where Y stiffness of Z column is much smaller as 1N/μm because of the large moment generated by Y force on the column.