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뇌종양 환자의 제왕절개술을 위한 전신마취 : 증례 보고 A case report
이헌근,전세현,손주태,신일우,정영균 대한마취과학회 2002 Korean Journal of Anesthesiology Vol.43 No.4
A 28-year-old primigravida at 33 weeks gestation was referred to our hospital because of aggravation of seizures which occurred intermittently for the past 2 years. A brain magnetic resonance imaging scan taken at 33 weeks gestation showed a large brain tumor (7 × 5 × 4 cm) in the left high frontal lobe. She had a cesarean section under general anesthesia at 38 weeks and 1 day gestation. General anesthesia was induced with thiopental 250 mg, succinyleholine 75 mg and lidocaine 60 mg after a vecuronium 0.8 mg intravenous injection. The hyperventilation and mannitol used to reduce increased intracranial pressure (ICP) in this patient may be harmful and detrimental to the fetus before delivery. Achieving both ICP control and fetal well being at the same time during a cesarean section can be challenging to anesthesiologists. We report the anesthetic management of a cesarean section in a patient with a large brain tumor. (Korean J Anesthesiol 2002; 43: 515~519)
대청호소수의 조류여과 및 인 제거를 위한 패각입자 응용
이연의,왕창근,정현상 忠南大學校 環境問題硏究所 1999 環境硏究 Vol.17 No.-
The purpose of this study is to develop new phosphorus removal technology which is not producing sludge, not adding chemicals, and easy to operate. This study was based on precipitation mechanism and was performed to see phosphorus removal efficiency of various clamshells serving as surface precipitation media. The results obtained from this study are following ; The batch tests performed with Daechung Lake water using the clamshell granules showed good removal efficiencies of phosphorus (up to 70%), chlorophyll a (up to 80%), turbidity (up to 80%), and total organic carbon (up to 50%) in the first stage. The removal efficiency decreased during repeated operation because of clogging of the clamshells void, but the removal efficiency was recovered after backwash with air and water. Judging from the results from this research, this technology can be applied for prevention of eutrophication and algal bloom in the lakes.
개구부 폭과 깊이 변화에 따른 철근콘크리트 깊은 보의 파괴모드 및 내력 평가에 관한 연구
양근혁,이영호,은희창,정헌수 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)
The purpose of this study is to investigate the failure mode and the shear strength of reinforced concrete deep beams with rectangular openings. Fourteen deep beams which shear span-to-depth ratio(a/h) is 0.5 were tested and an equation to predict the ultimate shear strength of deep beams with rectangular openings was established by the test results.
구속된 고강도 콘크리트 기둥의 휨 거동에 관한 실험적 연구
양근혁,이영호,곽노현,정헌수 중앙대학교 기술과학연구소 1998 기술과학연구소 논문집 Vol.28 No.-
본 실험적 연구의 목적은 콘크리트 강도, 띠근 배근형태, 띠근 량, 축하중비가 축하증과 횡하증을 받는 구속된 콘크리트 기둥의 휨 내력과 연성에 미치는 영향을 팡가하기 위한 것이다. 구속된 기둥의 휨 거동을 시험하기 위하여 200×200×800mm 크기의 시험체 14개를 2축 하중하에서 실험하였다. 시험결과로서, 저축력에서 콘크리트 구속으로 인한 휨 강도의 증가는 비교적 작게 있지만, 고축력에서 콘크리트 구속으로 인한 휨 강도 증가는 크게 있다. 그리고, 고축력, 고강도 콘크리트에서 내부 cross-ties가 있으면 휨 연성의 증가가 보였으며, 구속된 콘크리트 기둥의 연성은 단순한 띠근 량보다는 구속지수에 관계되었다. The purpose of this experimental study was to investigate the effects of concrete strength, the configuration of lateral ties, the amount of lateral ties, and level of axial loads on flexural strength and ductility of confined of reinforced concrete columns subjected to combined axial and lateral loads. To simulate the flexural behavior of confined columns, fourteen reinforced concrete columns, 200×200×800mm, were tested under bi-axial loads. Test results indicate that for low axial load levels, the enhancement of the flexural strength due to concrete confinement is relatively small, but that for high axial load levels, the enhancement of the flexural strength due to concrete confinement can be very high. Considerable enhancement of ductility was observed in columns confined by cross-ties, even for high strength concrete columns and under high axial loads. Ductility of confined columns are found to be more related to confinement index (ρ??f??/??) than the amount of lateral ties(ρ??)
상계치 이론을 이용한 장방형 개구부를 갖는 철근콘크리트 깊은 보의 전단내력 평가
양근혁,이영호,은희창,정헌수 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)
The purpose of this study is to evaluate the failure plane and the shear capacity of reinforced concrete deep beams with rectangular openings using upper bound theorem. A numerical optimization procedure programmed to obtain the minimum value of the shear capacity by adjusting the position of the instantaneous center according to various potential failure planes. The predictions obtained from the proposed method are in good agreement with experimental results.
미세 골절 진달을 위한 초음파 C-scan의 활용 가능성
박원근,최민주,이원흠,이윤준,이헌주,강창익,박전홍 제주대학교 공과대학 첨단기술연구소 2001 尖端技術硏究所論文集 Vol.12 No.2
The study examines the medical potential of an ultrasonic C-scanning technique and for diagnosis of the fatigue induced micro-fractures of the bone. In general, it is not easy to detect the microfracture by a simple radiological technique. In the study, the microfractures were made on the tibia taken from pigs using a three point bending. Comparison was made between the ultrasonic C-scan images (25 MHz) and X-ray images of the bones with the micro-fractures, It was found that the micro-fractures invisible on the X-ray images were observed on the ultrasonic images. It is proposed further in-vitro and in-vivo studies making the ultrasonic C-scan technique clinically useful for the diagnosis of the fatigued induced micro-fractures of the bone which are not possible to detect by the conventional radiological method.
좌새골하정맥을 통하여 중심정맥도관 삽입 3 일 후에 발생한 상대정맥천공과 우흉수 : 증례 보고 A case report
조형찬,손주태,최준영,신일우,이헌근,정영균 대한마취과학회 2002 Korean Journal of Anesthesiology Vol.43 No.4
A 67-year-old male patient had coronary artery bypass graft. Before the induction of general anesthesia, 16 gauge central venous catheter was inserted via left subclavian vein. Initial chest anteroposterior (AP) radiograph showed adequate position, and the central venous pressure measurement through it was satisfactory. This patient's progress was satisfactory, and he was extubated on the second postoperative day. Daily chest AP radiograph had been unremarkable until the third postoperative day, when a right-sided pleural effusion was seen. A day later, the patient complained severe chest pain and dyspnea. We suspected perforation of superior vena cava wall by tip of central venous catheter on the chest computerized tomograph (CT). The injection of radiopaque dye through the central venous catheter confirmed spillage into the mediastinum on the chest CT. Right chest tube was inserted. The patient's condition dramatically improved after chest tube insertion. (Korean J Anesthesiol 2002; 43: 525~530)