• 대한전기학회:학술대회논문집
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• 대한전기학회 1992년도 하계학술대회 논문집 B
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• pp.1182-1184
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• 1992

In case of chopper control is used for the d.c motor In the electric vehicle(EV) in general step down chopper is used for the driving and the step-up chopper is used for the regeneration. Bilateral variable ratio chopper system(BVRCS) formed by parallel combination of upper two chopper methods step-down, step-up and step-up/down chopper operations by duty cycle, circuit element and driving condition. In this paper, BVRCS is proposed for the simulated and experimented control of d.c motor in the EV. By the result of simulation BVRCS represents same driving power compared to the step-down and excellent breaking power compared to the step-up chopper system because of the greater motor current.

• Journal of Chest Surgery
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• 제17권3호
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• pp.511-515
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• 1984

In this study, 213 cases of the spontaneous pneumothorax experienced at the department of thoracic and cardiovascular surgery, Chungnam National University Hospital during from April, 1977, till Dec, 1983 were reviewed. 1.Sex ratio of the studied patients was 7.19;1 showing high incidence male patients. The incidence according to the age group showed that 20.2%, 18.3% of the patients belong to the age group 6th, 5th decade respectively. 2.The etiologic factors were as follows, tuberculous origin in 50.2%, unknown origin in 28.2%, COPD in 3.3%, bullae in 8.5%. The site was right in 47.9% and left in 44.1%, bilateral in 8%. 3.The clinical symptoms were frequently dyspnea in 35%, chest pain in 27.5%. 4.The employed method of treatment were as follow, bed rest with oxygen inhalation in 1.9%, closed thoracostomy in 95.8%, open thoracotomy in 7.98%, which bullectomy was performed in 12 cases and pneumonectomy in 3 cases and lobectomy in 1 case and decortication with simple closure of bleb was performed in remaining 1 case. 5.The duration of closed thoracostomy was longer in tuberculosis, which average duration was 11.28 days. 6.The overall recurrent rate was 12.3%.

• Journal of Chest Surgery
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• 제10권1호
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• pp.53-58
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• 1977

There are many procedures which treat pulmonary tuberculosis. Pneumoperitoneum of those which was begun by Banyai in 1934 is considered effective collapse therapy economically and socially in Korea. The author had studied 30 patients receiving pneumoperitoneum and/or chemotherapy who were moderatedly advanced pulmonary tuberculosis with positive sputum to AFB stain between Apt. 1, 1976 and Oct. 1, 1976. An attempt is to clarify the effects of pneumoperitoneum with chemotherapy [A group: 20 patients] in contrast with chemotherapy alone [B group: 10 patients] for 6 months. The results obtained were as follows: 1] All both groups showed the diminished pulmonary cavity size, but the effect of A group is prominent as 74% rather than 39% of B group. 2] Sputum conversion ratio is 55% in A group, and 20% in B group. 3] In Korea, the moderate amount of air is 1500cc in men, 1000cc in women. 4] Although pneumoperitoneum is in old hands, it is a relatively safe procedure, well tolerated, free from serious complications. 5] The advantages of pneumoperitoneum are evident in the treatment of bilateral lesion, with or without cavity, not too far advanced.

• The Journal of Korean Physical Therapy
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• 제25권4호
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• pp.167-173
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• 2013

Purpose: To obtain the isokinetic normative data of isokinetic laboratory of department of Rehabilitation Medicine in the normal subjects for those twenties of Korea. Methods: A total of 228 volunteers participated in this study and isokinetic evaluation of knee extensors and flexors at speed $60^{\circ}/sec$ BIODEX System 3 Isokinetic Dynamometer was performed in 128 males and 100 females. Results: In the normal subjects for those twenties, Normative data were presented. Absolute muscle strength of knee-extensors and knee-flexors, Relative muscle strength, bilateral muscle strength deficit, and flexor/extensor strength ratio were presented. Conclusion: Those results expect that it will be available for patients with 20's knee diseases to apply as the basic materials for the muscle function improvement of knee extensors and flexors.

• 대한기관식도과학회지
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• 제5권1호
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• pp.68-72
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• 1999

Odontogenic keratocyst is a central destructive lesion of the jaws characterized by a thin, fragile layer of orthokeratinizing or parakeratinizing stratified squamous epithelium. Correlation between the histologic type and the recurrence ratio remains a subject of controversy, and multiple cysts are known to be associated with the nevoid basal cell syndrome. We experienced a case of multiple odontogenic keratocyst in a 25 year-old male patient involving bilateral mandible and maxilla. The cystic mass of the right maxilla was removed by Caldwell-Luc's approach and the right mandibular mass was removed by intraoral approach but the teeth that were impacted in the mandibular bone were remained in order to prevent an iatrogenic fracture.

• 대한기관식도과학회:학술대회논문집
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• 대한기관식도과학회 1981년도 제15차 학술대회연제순서 및 초록
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• pp.40.2-40
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• 1981

이개의 기형은 임상적으로 드문 질환으로, 크게 발육장애와 발육과잉으로 나눈다. 발육장애의 하나인 소이의 발생빈도는 약 6,000 : 1, 남 : 여가 2 : 1, 일측대양측은 대체로 8 : 1의 비율이다. 고도의 기형은 외이도와 중이에 까지 기형을 동반할 수 있다. 최근 저자들은 건강한 24세의 남자에서 청력장애나 기타 수반된 장애가 없는 편측성 소이를 Local flap을 이용한 Rotation flap으로 교정했던 좋은 결과를 얻었기에 문헌적 고찰과 함께 보고하는 바이다.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 2015년도 하계학술대회
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• pp.328-331
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• 2015

본 논문은 EBME(Extended Bilateral Motion Estimation) 알고리듬에서 움직임 벡터들의 방향과 크기를 고려한 알고리듬을 제안하였다. EBME는 높은 연산량을 요구하기 때문에 프레임 내의 x, y방향 각각의 평균 움직임 벡터크기를 이용하여 동적 프레임과 정적프레임을 판단하고, EBME 수행여부를 결정하여 연산량을 줄인다. 또한 동일한 움직임 벡터들의 방향과 크기를 비교하여 MVS(Motion Vector Smoothing)단계 수행여부를 판단함으로써 연산량을 줄인다. 제안하는 알고리듬을 적용한 실험 결과 기존의 EBME 알고리듬에 비해 수행시간은 단축되었으나 PSNR(Peak Signal to Noise Ratio)은 향상 되었다.

• Journal of Chest Surgery
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• 제18권4호
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• pp.582-588
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• 1985

We have observed 165 cases of spontaneous pneumothorax from Aug. 1978 to May. 1985 at the department of Thoracic and Cardiovascular Surgery, School of Medicine, Keimyung University. The ratio of male to female cases were 8.2:1 in male predominance, and the incidence was highest in the adolescence between 21 to 30 year of age. There were 85 patients of primary spontaneous pneumothorax and 80 patients of secondary spontaneous pneumothorax. The etiologic factors of secondary spontaneous pneumothorax were tuberculous origin in 50 cases, chronic bronchitis with emphysematous bullae or blebs in 17 cases, asthma in 10 cases and lung cancer in 3 cases. Closed thoracotomy was performed for reexpansion of collapsed lung in 153 cases, bed rest in 3 cases, needle aspiration in 5 cases and open thoracotomy in 14 cases. Closed thoracotomy was the main therapeutic approach of choice in the great majority of spontaneous pneumothorax with recurrence rate of 21.6%. However, open thoracotomy was undertaken in patients with continuous air leakage, recurrent episodes, bilateral pneumothorax and large visible apical blebs or bullae.

• Journal of Trauma and Injury
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• 제24권1호
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• pp.12-17
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• 2011

Purpose: A rib fracture secondary to blunt thoracic trauma continues to be an important injury with significant complications. Unfortunately, there are no definite treatment guidelines for severe multiple rib fractures. The purpose of this study was to evaluate the result of early operative stabilization and to find the risk factors of surgical fixation in patients with bilateral multiple rib fractures or flail segments. Methods: From December 2005 to December 2008, the medical records of all patients who underwent operative stabilization of ribs for severe multiple rib fractures were reviewed. We investigated patients' demographics, preoperative comorbidities, underlying lung disease, chest trauma, other associated injuries, number of surgical rib fixation, combined operations, perioperative ventilator support, and postoperative complications to find the factors affecting the mortality after surgical treatment. Results: The mean age of the 96 patients who underwent surgical stabilization for bilateral multiple rib fractures or flail segments was 56.7 years (range: 22 to 82 years), and the male-to-female ratio was 3.6:1. Among the 96 patients, 16 patients (16.7%) underwent reoperation under general or epidural anesthesia due to remaining fracture with severe displacement. The surgical mortality of severe multiple rib fractures was 8.3% (8/96), 7 of those 8 patients (87.5%) dying from acute respiratory distress syndrome or sepsis. And the other one patient expired from acute myocardial infarction. The risk factors affecting mortality were liver cirrhosis, chronic obstructive pulmonary disease, concomitant severe head or abdominal injuries, perioperative ventilator care, postoperative bleeding or pneumonia, and tracheostomy. However, age, number of fractured ribs, lung parenchymal injury, pulmonary contusion and combined operations were not significantly related to mortality. Conclusion: In the present study, surgical fixation of ribs could be carried out as a first-line therapeutic option for bilateral rib fractures or flail segments without significant complications if the risk factors associated with mortality were carefully considered. Furthermore, with a view of restoring pulmonary function, as well as chest wall configuration, early operative stabilization of the ribs is more helpful than conventional treatment for patients with severe multiple rib fractures.

• 대한구순구개열학회지
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• 제4권2호
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• pp.51-68
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• 2001

Midfacial hypoplasia in patients with clefts of the lip and palate is considered to be the result of congenital dysmorphogenesis. And cleft lip and palate developes facial deformity, jaw abnormality, speech problem, which is most frequent hereditary deformity in maxillofacial region. So cleft lip and palate is characterized by midface deformity which shaws maxillary anterior nasal septal deviation and deformity. Our study describes congenital correlates of midfacial hypoplasia by examining the displacement of a normal complement of parts, a triangular tissue deficiency low on the lip border on the columellar side, and a linear deficiency and displacement in the line of the bilateral cleft lip. 15 patients with bilateral cleft lip and palate were taken impression before operation, but the patient who had other abnormalities and complications were excluded. Average age is 3.4 months and they were classified into both complete, both incomplete and complete & incomplete group. The obtained results were as follows 1. There were no differences on intercanthal width and canthal width between each of the groups. 2. Both complete group had longer lateral ala length than both incomplete group, but there were no differences between both complete group and complete side of com. & incom. group and both incomplete group and incomplete side of com. & incom. group. 3. Columella length was greater in both incomplete group than in both complete group, but there was no difference between both complete group and complete side of com. & incom. group and both incomplete group and incomplete side of com. & incom. group. 4. Both complete group had longer ala width & ala base width than both incomplete group had. But there were no differences between both complete group and complete side of com. & incom. group and both incomplete group and incomplete side of com. & incom. group. 5. There were no differences between each of the groups on upper lip length, but nose/mouth width ratio was greater in both complete group than in both incomplete group. 6. Pronasale(pm), subnasle(sn), la~rale superioris(ls), stomion(sto) points were located around the central vertical line of face but deviated to incomplete side in com. & incom. group. 7. Nasal tip protrusion was greater in both incomplete group and com. & incom. group than both complete group, but there was no difference between both incomplete group and com. & incom. group.