퇴행성 요추 병변에서 척추경 나사를 이용한 요천추유합의 결과

김진혁,이상민,정의룡 인제대학교 백병원 2002 仁濟醫學 Vol.23 No.5

Objective: To evaluate the efficacy of lumbosacral fusion with bilateral bicortical S1 pedicle screw fixation without anterior support on the basis of the fusion levels in degenerative lumbosacral disease. Materials and Methods: Seventy three patients were treated with posterior decompression and posterolateral fusion with bilateral bicortical S1 pedicle screw fixation. Their results were analyzed retrospectively with minimum 2-year follow-up. Postoperative anteroposterior and lateral radiographs were analyzed for S1 screw loosening, fixation failure and lumbosacral fusion. Medical records were analyzed for postoperative low back pain and complications. Results: S1 screw loosening was 1(6.3%) in 2 level fixations, 3(14.3%) in 3 levels, 7(5O.0%) in 4 levels and 13(86.7%) in more than 5 levels. Fixation failure was 1(4.8%) in 3 levels fixation, 1(7.1%) in 4 levels, 5(33.3%) in more than 5 levels. Non-union was suspected in 30 patients(41.1%), 1(14.3%) in mono-level fixation, 2(12.5%) in 2 levels, 8(38%) in 3 levels, 9(64%) in 4 levels and 10(67%) in more than 5 levels. Postoperative sustained low back pain was 1 in 3 levels fixation, 2 in 4 levels and 7 in more than 5 levels. Postoperative complications were detected in more than 3 level fixations ; hematoma in 2, wound infection in 6, progressive kyphosis in 2. Conclusion: Lumbosacral fixation with bilateral bicortical S1 pedicle screw could not provide satisfactory outcome in long level fusion especially in more than 4 levels fusion of degenerative lumbar disease.

척추경 나사 고정 및 후방 유합술만으로 치료한 Andersson 병변 : Andersson 병변 Andersson lesion

김진혁,이상민,정의룡 인제대학교 백병원 2002 仁濟醫學 Vol.23 No.5

A60-year-old female patient with Andersson lesion is presented. Andersson lesion or spondylodiscitis in ankylosing spondylitis is a rare but well-known condition defined as an erosive and sclerotic process involving the intervertebral disc and adjacent vertebral bodies. The causes of this condition are not well understood. The Andersson lesion is often painful, and needs surgical treatment. The patient underwent segmental pedicle screw fixation and posterior fusion without any anterior procedure. The clinical features are presented with leterature review.

자기 성장 훈련이 자아 개념에 미치는 효과

金赫坤,李壽進 순천대학 학생생활연구소 1997 學生生活硏究 Vol.16 No.-

원격조작에 의한 작업대상물 강성과 마찰 특성의 동정

권혁조,전지명,김진옥,문일동,오재윤 전북대학교 공학연구원 ( 구 전북대학교 공업기술연구소 ) 2002 工學硏究 Vol.33 No.-

This study performs a workpiece stiffness and frictional characteristic identification experiments by teleoperation. Experiments are performed using a bilateral force feedback teleoperation system. It is composed of a master manipulator, the slave manipulator equipped with a force/torque sensor, and a real-time control system. To control the teleoperation system, a position-force controller is developed. The slave manipulator is controlled by the master manipulator's position command and the master manipulator is controlled by the force information from the slave manipulator. This study presents a method to find the slave manipulator's stiffness. And, this study presents a method to compute the workpiece stiffness based on the measured pressing force and deflection at the slave manipulator. Also, this study performs a workpiece frictional characteristic identification experiments. In the experiments, the slave manipulator rubs a workpiece with an arbitrary pressing force. While the slave manipulator rubs a workpiece, a vertical force and a frictional force are measured and the ratio of a frictional force to a vertical force is considered as a frictional characteristic.

후방 도달 반척추 절제술을 이용한 선천성 측만증의 치료

김진혁,이상민,정의룡 인제대학교 백병원 2002 仁濟醫學 Vol.23 No.5

Objectives: To evaluate the surgical outcomes of congenital scoliosis with hemivertebra corrected by posterior vertebral column resection after a minimum follow up of 2years. Materials & Methods: Thirty five congenital scoliosis cases(20 males and 15 females) subjected to posterior vertebral column resection and without any previous operative intervention were analyzed. They were analyzed for deformity correction and complications. The mean age at operation was 14.6 year-old(range 2.6~35) and mean follow-up was 3.1 years(range 2.0~4.5). The preoperative index curve was 44.5±15.8° in coronal plane, and 22.7±35.9° in sagittal plane. Results: The total number of resected vertebrae were 36 : 17 in thoracic and 19 in lumbar. The deformity correction was 57.0% with 19.0±10.6° in the coronal plane and 69.0% with 7.0±14.9° in the sagittal plane. Mean operation time was 222.7±54.9 minutes with a total perioerative transfusion of 1992.0 ㎖. Complications were encountered in 3 patients(8.6%) : 1 hematoma and cauda equina syndrome, 1 fixation failures and 1 transient posterior cord syndrome. Conclusion: Posterior vertebral column resection in congenital scoliosis with hemivertebra is an effective method compared to anterior-posterior two stage hemivertebra resection. It could offer satisfactory correction of deformity and restoration of spinal balance.

실존주의 사상과 현대 영미문학 : 현대 실존 해석학과 포스트모던 문학까지

이상혁,양병현,최진영,현중식 中央大學校 人文科學硏究所 1998 人文學硏究 Vol.27 No.-

He 원자의 가장 낮은 들뜬 상태 에너지의 수치 계산

차혁렬,양해정,김미정,정진,양회룡,최승평,장차익 조선대학교 기초과학연구소 1999 自然科學硏究 Vol.22 No.1

The one-electron theory of atoms, molecules, and crystals have enjoyed a wide success in many branches of physics. This theory provides a physically appealing description of the electronic structure of many-electron systems. In addition, this theory gives a convenient basis for performing the detailed calculation on specific many-electron systems. In such calculations, it is usually necessary to introduce many simplified assumptions in order to make a progress. Since the principal computational difficulty supposed by the Hartree-Fock equations is the treatment of the exchange term, it would be very desirable to simplify the treatment of these terms by using Slater's average of the exchange potential. The first order correction of energy in the lowest excited states of He atom is calculated by using the unperturbed wave function obtained with the Hartree-Fock-Slater approximation and compared with the result obtained by the simple analytical method. The numerical results agrees with an experimental results for the lowest excited states of He atom with tolerance 3.22%, 2.16%, 2.94% and 3.41%. These results show that the numerical analysis can be applied to other multielectron atoms with the personal computer.

일일초 세포생장에 촉진물질이 미치는 영향에 관한 연구

김린주,정욱진,권혁민,김두회 明知大學校 産業技術硏究所 1996 産業技術硏究所論文集 Vol.15 No.-

The effects of fatty acids related with elicitation mechanism were investigated in cell suspension cultures of Catharanthus roseus. The specific growth rate in control culture was 0,17 to 2.0 day-¹ and the cell doubling time(td) showed 3.5 to 4 days. The highest specific growth rate was obtained when the inoculum was added at 4g FCW, compared with 2 and 3 g FCW inoculum. The suspension cells were cultured at various concentrations of fatty acids and fatty acid was added at different culture time. The addition of methyl jasmonate among fatty acids only showed the slight promoting effect on cell growth but others did not show any increasing effect. The best injection period of fatty acid to promote the cell growth was the inoculation time.

고도 성인 흉부 측만증에서 시행한 후방 척주절제술

정의룡,김진혁,이상민 인제대학교 백병원 2002 仁濟醫學 Vol.23 No.5

Objective : To report the result of one stage posterior vertebral column resection(PVCR) in treating severe adult thoracic scoliosis Materials and Methods : Thirteen patients(average age 30.2 years) with thoracic scoliosis were treated with PVCR. Their results were retrospectively reviewed after a minimum follow-up of 2 years for deformity correction and complications. Etiological diagnoses were neglected idiopathic in 6, congenital in 4 and others in 3. The average preoperative scoliosis was 96°(range: 70∼143) with less than 25% flexibility. The average preoperative trunk shift was 2.Ocm(range: O∼6.0) and the shoulder height difference was 2.1 cm(range: O∼8.0). The procedure consisted of a posterior midline approach, segmental pedicle screw fixation of the index curve, resection of the posterior elements, bilateral rib heads and vertebral bodies with adjacent discs, anterior column reconstruction with a structural graft or chip bones, and correction of the deformity by derotation and cantilever method. Results : Total 17 thoracic vertebrae were resected. The most common resection was T8 in 5 patients. The mean operative time was 387 minutes with an average blood loss of 4864 ml. At latest follow up, the index curve was corrected to 36(range: 15∼78) showing a correction of 63%. The loss of correction was 4%. The trunk shift and the shoulder height difference were improved to 0.4cm(range: O∼1.4) and 0.4cm (range: O∼1.0), respectively. One paraplegia occurred in scoliosis with Beal's syndrome, who had a preoperative neurologic deficit. Conclusion: One stage posterior vertebral column resection could be performed safely and effectively for severe adult thoracic scoliosis, even though technically demanding and involves possible risk for major complications.

구내 표준 방사선사진을 이용한 구내방사선촬영기의 선질 평가

이상섭,권혁락,심우현,오승현,이지연,전국진,김기덕,박창서 대한구강악안면방사선학회 2000 Imaging Science in Dentistry Vol.30 No.3

Purpose : This study was to evaluate the beam quality of intraoral X-ray equipments used at Yonsei University Dental Hospital (YUDH) using the half value layer (HVL) and the characteristic curve of intraoral standard X-ray film. Materials and Methods : The study was done using the intraoral X-ray equipments used at each clinical department at YUDH. Aluminum filter was used to determine the HVL. Intraoral standard film was used to get the characteristic curve of each intraoral X-ray equipment. Results : Most of the HVLs of intraoral X-ray equipments were higher than the least recommended thickness, but the REX 601 model used at the operative dentistry department and the X-707 model used at the pediatric dentistry department had HVLs lower than the recommended thickness. The slopes of the characteristic curves of films taken using the PANPAS 601 model and REX 601 model at operative dentistry department, the X-705 model of prosthodontic dentistry department, and the REX601 model at the student clinic were relatively low. Conclusion : HVL and the characteristic curve of X-ray film can be used to evaluate the beam quality of intraoral X-ray equipment. In order to get the best X-ray films with the least radiation exposure to patients and best diagnostic information in clinical dentistry, X-ray equipment should be managed in the planned and organized fashion. (Korean J Oral Maxillofac Radiol 2000; 30: 183-188)