고속 가공기 스핀들의 진동에 관한 실험적 연구

최영호,김광영,최병오,Choe, Yeong-Ho,Kim, Gwang-Yeong,Choe, Byeong-O 한국기계연구원 2001 硏究論文集 Vol.31 No.-

In this paper, the critical vibration limits of a spindle unit for a high speed ball pen tip processing machine are studied. The vibration of the spindle is measured by FFT, and the influence of the vibration amplitude due to unbalance, bearing deflect, bite, and timing belts tension is analyzed. The critical vibration limits of the spindle is determined by the X, and Z directional vibrations of the spindle. Both FET and RMS values can be used to analyze the vibration characteristics of the spindle. From experimental results the limit line can be drawn for the spindle. The RMS value for the vibration limit is 3 G.

비례 압력제어 기술

최영호,윤소남,김도우,Choe, Yeong-Ho,Yun, So-Nam,Kim, Do-U 재료연구소 2002 機械와 材料 Vol.14 No.2

개심술시 장시간 대동맥 차단 [200 분]: 3례 보고

최영호,장정수,이종국,Choe, Yeong-Ho,Jang, Jeong-Su,Lee, Jong-Guk 대한흉부심장혈관외과학회 1983 Journal of Chest Surgery (J Chest Surg) Vol.16 No.3

Three cases of multiple cardiac valve replacement were done in March 1983 at the department of thoracic and cardiovascular surgery, Chosun University College of Medicine. The patients were moderately symptomatic in all cases, and belonged to the class II and III of the NYHA functional criteria. The diseased valved were replaced with Bjork--Shiley, Ionescu-shiley valve prosthesis under cardiopulmonary bypass using hemodilution technique. The kind of cardioplegic solution used in our institute were Young and GIKs solution with core surface cooling. The average cardiopulmonary bypass time was 251.6 minutes and the average aortic cross clamping time was 223 minutes for aortic and mitral valve replacement. There was no operative morality.

물류센터의 시스템화

최영호,Choe, Yeong-Ho 한국물류협회 2005 물류혁신 컨퍼런스 Vol.13 No.3

식도 질환의 외과적 치료 및 분석

최영호,조성준,조원민,김광택,Choe, Yeong-Ho,Jo, Seong-Jun,Jo, Won-Min,Kim, Gwang-Taek 대한흉부심장혈관외과학회 1996 Journal of Chest Surgery (J Chest Surg) Vol.29 No.10

A clinical study was performed on 152 cases of surgical esophageal disease treated by the Department of Thoracic & Cardiovascular Surgery of Korea University Hospital from Jan. 1989 through July 1994. The most common esophageal disease was cancer which was seen in 73 cases (48%) among 152 cases. All were treated surgically' 52 patients (71%) were managed by curative or palliative resection with reconstruction and feeding gastrostomy or jejunostomy, otherwise Celestine tube insertion was performed on the remaining 21 patients for palliatio'n. Esophageal leiomyoma occurred in 6 cases(3.9%), among them 1 case was performed with trio recoscopic enucleation . Achalasia were in 7 cases (4.6%) and was treated with modified Heller's m otomy and with Belsey Mark IV operation. Diverticulum were in 11 cases (7.2%). Esophageal stricture occurred in 20 cases (14.1 %) and 17 of 20 cases were managed with bypass surgery. Esophageal perforation was seen in 20 cases, its cause was instrumental trauma in 7 cases, stab wound in 4 cases, foreign body in 4 cases, spontaneous perforation in 3 cases, and others 1 case Other disease including congenital lesion was seen In 1 Scases. 고려대학교 흉부외과학 교실에서는 최근 5년간(1989년 1월∼1994년 7월) 외과적 치료를 시행했던 152례의 식도환자를 대상으로 악성 종양, 양성 종양, 운동성 장애 질환(식도 게실 및 무이완증), 협착, 천공 및 선천성 질환으로 분류 임상분석을 시도하였다. 가장 많았던 질환은 악성종양이며 총 73례로, 전체환자의 48%를 차지하였다. 이중 71%인 52례의 경우에서 식도의 절제 및 재건술을 시도하였고, 나머지 경우에 있어서 위루 성형술, 공장루 성형술 및 식 도관 삽입을 시행하였다. 남녀 비는 남:여 65.8이 었으며, 평균나이는 58.7세였다 이중 합병증으로 인한 병원내 사망례는 5례로 7.8%이며, 합병증으로는 문합부 누출이 가장 많았다. 양성종양은 모두 평활근종으로 6례 (3.9%)였으며, 이중 1례의 경우 흉강경을 이용한 적출술을 시행하였다. 운동성 질환중 식도무이완증(Achalasia)이로(4.6%), 변형된 Hello이 근절개술을 시행하였고, 3례는 Belsey Mark IV 수술을 동반하였다. 게실은 11례 (7.2%)였다 식도협착은 20례 (14.1%)로 대부분이 부식제 섭취에 의한 협착이었으며, 이중 17례에서 위나 대장을 이용한 재 건술을 시행하였다. 식도천공은 20례 (14.1%)였으며 이중 내시경등에 의한 외부손상례가 가장 많았고(15례), 수술방법으로는 천공부위의 일차봉합이 가장 많았고(8례), 6례의 경우 격리 우회술을 시행하였으며, 이중 사망례는 없었다 선천성질환이 6례 (3.9%)였고,나머지 기관-식도루등의 기타질환이 9례(5.9%)였다.

ESCO Column 1 - 그린 빌딩 설계기법과 기술 - 친환경 건축의 바른 길

최영호,Choe, Yeong-Ho 에너지절약전문기업협회 2010 esco Vol.64 No.-

친환경 건축물은 자연친화적인 건물을 실현해 사용에너지를 최소화하고 탄소배출을 줄이는 것을 목표로 한다. 에너지사용을 먼저 줄인 후 그 다음 신재생에너지로 필요한 에너지를 충당해야 한다는 것. 때문에 친환경 건축 설계기법으로 최적향 선택과 에너지효율화를 높일 수 있는 외피시스템, 고성능 단열재, 고 단열 창호, 폐열회수환기시스템 등이 거론되고 있다. 친환경 건축의 바른 길을 위해 숙지해야 할 요소를 짚어보았다.

서평 : 광뢰후종(히로세 고조), 『인국』 (동경 : 근대 문예사, 1997)

최영호 ( Choe Yeong Ho ) 한일민족문제학회 2003 한일민족문제연구 Vol.5 No.-

고효율 양자점 발광소자를 위한 양자점 나노구조체 제어

임재훈,최영호,Im, Jae-Hun,Choe, Yeong-Ho 한국정보디스플레이학회 2019 인포메이션 디스플레이 Vol.20 No.1

양자점 발광소자 기술은 지난 20여년 동안 급격한 발전이 이루어졌으며, 이는 양자점 발광체 및 소자기술 전반에 대한 집중적인 연구의 결과로 생각할 수 있다. 그러나 양자점 발광소자기술의 상용화를 위해서 해결해야 할 문제는 소재(예: 무중금속 양자점 구현, 대량생산 등) 및 소자(예: 수명문제, 대면적 프린팅문제, 효율저하문제)에 걸쳐 산적해 있다. 본 기고문에서는 이상의 다양한 문제 중 양자점 발광소자의 효율저하문제를 집중적으로 다루었다. 비록 양자점 나노구조체의 제어 및 발광소자 연구가 여전히 카드뮴 기반 양자점을 바탕으로 한 기초연구영역에 머물러 있지만, 향후 친환경 양자점 합성기술이 본격적으로 발전하게 된다면 우수한 효율과 안정성을 보이는 양자점 발광소자가 구현되리라 기대된다.

늑간 신경 냉동요법에 의한 개흉술후 흉부 동통 관리

김욱진,최영호,김형묵,Kim, Uk-Jin,Choe, Yeong-Ho,Kim, Hyeong-Muk 대한흉부심장혈관외과학회 1991 Journal of Chest Surgery (J Chest Surg) Vol.24 No.1

Post-thoracotomy pain is so severe that lead to postoperative complications, such as sputum retention, segmental or lobar atelectasis, pneumonia, hypoxia, respiratory failure due to the patient`s inability to cough, deep breathing and movement. Many authors have been trying to reduce the post-thoracotomy pain, but there is no method of complete satisfaction. In 1974, Nelson and associates introduced the intercostal nerve block using the cryoprobe. The application of cold directly to the nerves causes localized destruction of the axons while preserving the endoneurium and connective tissue, thereby introducing a temporary pain block and able to complete regeneration of intercostal nerves. One hundred and two patients, who undergoing axillary or posterolateral thoracotomy at the Department of Thoracic and Cardiovascular Surgery in Korea University Medical Center between April 1990 and August 1990, were evaluated the effects of cryoanalgesia for the post-thoracotomy pain reduction. The patients were divided into two groups: Group A, control, the patients without the cryoanalgesia[No.=50], Group B, trial, the patients with cryoanalgesia[No.=52]. Before the thorax closed, in the group A, local anesthetics, 2% lidocaine 3cc, were injected to the intercostal nerves[one level with the thoracotomy, one cranial and caudal intercostal level and level of drainage tube insertion]. In the group B, cryoprobe was directly applied for 1 minute at the same level. Postoperative analgesic effects were evaluated by the scoring system which made arbitrary by author: The pain score 0 to 4, The limitation of motion score 0 to 3, The analgesics consumption score 0 to 3, The total score, the sum of above score, 0 to 10. For the evaluation of immediate analgesic effects, the score were evaluated at the operative day, the first postoperative day, the second postoperative day, and the seventh postoperative day. The effects of incision type, and rib cut to the post-thoracotomy pain were also evaluated. The results were as follows; 1. The intercostal block with cryoanalgesia reduced the immediate postoperative pain significantly compare with control group. 2. The intercostal block with cryoanalgesia improved the motion of the operation side significantly compare with control group. 3. The intercostal block with cryoanalgesia reduced the analgesics requirements at the immediate postoperative periods significantly. 4. The intercostal block with cryoanalgesia lowered the total score significantly compare with control group. 5. The intercostal block with cryoanalgesia were more effective to the mid-axillary incision than to the posterolateral incision 6. The intercostal block with cryoanalgesia were more effective to the patients without rib cut than to the patients with rib cut. 7. No specific complication need to be treated were not occurred during follow-up.

심장 파열 수술치험 10례에 대한 분석

손영상,최영호,김학제,Son, Yeong-Sang,Choe, Yeong-Ho,Kim, Hak-Je 대한흉부심장혈관외과학회 1995 Journal of Chest Surgery (J Chest Surg) Vol.28 No.11

From January, 1990 to December, 1994, we have operated 10 patients with cardiac rupture. The patients are divided into two groups according to their clinical manifestation ; five patients in each hemorrhage and tamponade group. The patients in both groups could maintain their vital signs with closed thoracostomy and fluid resuscitation. The effect of pericardiocentesis was especially dramatic in three patients of tamponade group. The average time from injury to admission was 101 minutes and that of the patients who came our hospital via one or two other hospitals was 170 minutes comparing 31 minutes of those who came directly. The average time from admission to operation was 211 minutes. Considering 98 minutes for the diagnosis and preoperative management and another 30 minutes for the preparation for operation, operations were delayed by 83 minutes to get permission. We conclude that this delaying time for transport and operation of heart-ruptured patients should be shortened in order to manage them more effectively.