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朴海壽,姜東淑 中央醫學社 1964 中央醫學 Vol.7 No.3
Airway obstruction is one of the few real emergencies in medical practice. The history of tracheotomy is long and still it remains as one of the most important life saving procedure in case of asphyxia. This article report the result of clinical studies on 92 cases of tracheotomy performed at the E. N. T. Clinic, Inchon Methodist hospital, Inchon, Korea, covering-a three years period from January, 1960 to December, 1962. Among 719 E. N. T. operations, tracheotomy cases were 92 (12.6 per cent). This was surprisingly high number in frequency, 58 (63 per cent) of these cases were male and 34 (37 per cent) were female. Approximately two third of the cases were between one and five years of age (58.6 per cent), and youngest was 13 months and oldest was 58 year-old. Majority of the cases occurred in winter time while none case occurred in August and September. Analysis of the causative disease revealed more than two third of the cases were laryngeal or pharyngeal diphtheria, and none diphtheric acute laryngitis, laryngeal abscess, laryngeal edema, retropharyngeal abscess, intoxication, foreign body, Ludwig's angina, laryngeal cancer, laryngeal papilloma were next in order. Decannulation could be performed within one week in the most of diphtheria cases. The complication rate was 16.3 per cent (15 cases), and following postoperative complications were seen: cervical subcutaneous emphysema in four cases, mediastinal emphysema in one case, pneumothorax in one case, postoperative hemorrhage in two cases, pulmonary. atelectasis in three cases, and possible pneumonia in one case. As a permanent complication hoarseness developed in one case, caused by protracted perichondritis, which occurred following severe laryngeal abscess. The mortality rate was 8.6 per cent: 8 cases were died during or after operation. Three caes who died during operation visited the hospital with almost exhausted state because of imminent asphyxia. Among five cases, who died after operation, one death occurred due to extensive mediastinal emphysema with pneumothorax, one due to reobstruction of the airway, two due to cardiac failure(diphtheria cases), and one due to unknown cause. Following warnings summarized: 1) Tracheotomy should never be underestimated as a simple and easy surgical procedure, this is especially true in children and emrgency situation, 2) Unless temporary adequate airway is being provided general anesthesia. must be avoided even routine premedication such as administration of sedatives or narcotics. 3) Policy of watch and wait until last minutes should be condemned: tracheotomy should be done as elective rather than emergency. 4) In case of impending asphyxia emergency establishment of airway, such as introduction of bronchoscope, Mosher's life saving tube, or endotracheal tube, is considered to be very wise way to perform uneventful tracheotomy, it is, however, almost impossible to do so in some occasions. In such instances emergency tracheotomy is mandatory. 5) Surgeon should familiar with both orderly tracheotomy and emergency tracheotomy technic. 6) As Jackson recommended authors emphasize that tracheotomy should be done as low as possible, this is particularly so in younger age group to pervent decannulation difficulty. 7) Aftercare cf tracheotomized case is not easy. Doctor and nurses should always keep in mind that reobstruction of the airway can be happened by various causes, Regulation of the room temperature and humidity seems to be very important in keeping airway free from crust formation.
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박해수,박양병 대한산업공학회 2008 대한산업공학회 추계학술대회논문집 Vol.2008 No.11
최근, 일본 등 선진국의 소매 유통분야에서 인터넷 망을 이용하여 실시간으로 재고파악이 가능한 스마트 자동판매기(smart vending machine system: SVMS)의 보급이 점차 확대되고 있으며, 국내에서도 스마트 자동판매기의 사용이 본격화 될 것으로 예상된다. 자동판매기의 실시간 재고 파악이 가능하게 되면, 공급자는 자동판매기의 재고보충계획을 실시간 재고수준을 토대로 보다 최적에 가깝게 수립할 수 있어 불필요한 재고와 품절 감축함으로써 공급사슬의 판매수익을 늘릴 수 있을 것으로 예상된다. 본 논문에서는 컴퓨터 시뮬레이션을 이용하여 일반 자동판매기에 대한 스마트 자동판매기의 운영 효과를 평가한다. 자동판매기 운영에는 제품 저장공간크기 결정, 재고보충계획, 차량경로결정을 포함하며, 이들의 의사결정을 위해 2단계 휴리스틱 해법을 개발한다. 제품 저장공간크기 결정에는 품절 시 고객의 제품 대체현상을 반영한다.
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발계측 자료에 기초한 신골 할출 시스템의 검증에 관한 연구
박해수,Park, Hae-Soo 대한인간공학회 2007 大韓人間工學會誌 Vol.26 No.1
Shoe's size and shape are determined by the last that takes shape of foot because last is the mold of shoe in development and manufacturing process. Then adaptation between foot and shoe is dependent on the last. In mass shoe production, model size is developed in the first place, other sized lasts are made through the grading process based on model size. The most important factor in grading system is grading deviation that must be same amount induced from foot measuring database. At present, most of the last manufacturing companies in korea using 260mm as a standard foot model size. When length grading deviation is 5mm, the ball girth grading deviation is 3.7mm and the ball width grading deviation is 1.2mm. I verified existing grading system by comparing grading results with foot measuring data. Also, I proposed reasonable grading deviation and application method of grading system. From the analysis of foot measuring database, reasonable grading deviations are 1.22mm in ball width and 0.84mm in ankle height in case of length grading deviation is 5mm. I confirmed that the current grading system is very accurate. When we grade last from 230mm to 290mm by current grading system based on model size 260mm, there is grading error over 1mm in the front outside area of foot. This error level of 1mm is no problem in normal walking shoe's last, but it induces adaptation problems in sports and special purposed shoe's last. Therefore using of three standard model size is recommended in grading men's last for reducing grading deviation error under the level of 1mm. It is specifically described as 235mm in 225-245mm, 260mm in 250-270mm, 285mm in 275-295mm. According to the above recommended grading system, it is enough to measure only three foot sizes in case of foot measuring project for men's last development.
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박해수,박양병 대한산업공학회 2009 대한산업공학회 추계학술대회논문집 Vol.2009 No.10
자동판매기 시스템을 운영하는데 있어 제품별 보관함 수와 보충주기의 결정은 자동판매기의 총수익에 영향을 미치는 중요한 의사결정문제이다. 왜냐하면, 이들은 자동판매기에서 품절과 재고유지비, 그리고 수송비에 직접인 영향을 미치기 때문이다. 본 논문에서는 자동판매기 고객의 재고부족 시 수요대체와 포기 현상이 존재하는 상황에서 계획기간 동안의 총수익을 최대화하는 자동판매기의 제품별 보관함 수와 보충주기를 동시에 결정하는 수리모형을 구축하고, 이를 토대로 휴리스틱 해법을 제안한다. 그리고 간단한 예제에 대한 시뮬레이션을 통하여 해법의 성능을 평가한다.
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