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打擊速度 및 溫度變化가 豫크랙을 가진 衝擊試驗片의 動的破壞靭性에 미치는 影響
兪在煥,李敬奉,金重吉,李致雨,吳世旭 慶南大學校 附設 工業技術硏究所 1989 硏究論文集 Vol.7 No.-
計裝化衝擊試驗에서 打擊速度와 溫度의 變化가 豫크랙을 揷入한 衝擊試驗片의 動的破壞靭性에 미치는 影響을 考察한 結果 다음을 알 수 있었다. 豫크랙을 揷入한 試驗片이 V-노치 試驗片에 比하여 實驗値의 分散度가 적으며 0℃以下의 溫度領域에서 動的破壞靭性의 有效性이 있었다. 또한 打擊速度와 實驗溫度의 影響은 溫度가 速度보다 훨씬 上廻하는 傾向이었다. The effect of various impact velocity and temperature on dynamic fracture toughness is tested with precracked Charpy specimen, and conclude following results. Precracked specimen has less dispersion of test results than V-notched specimen, unstable crack initiation load didn't agreed to maximum load at room temperature but at 0℃ below, thus, the availability of dynamic fracture toughness is relatively high. Comparing V-notched specimen, the precracked Charpy specimen represented lower shelf of temperature different. But, at this time, the absorbed energy is estimated equivalently. With the decrease of temperature, the reduction of fracture toughness was obvious, but the effect of impact velocity didn't appear.
유재우 江南大學校産學技術硏究所 1996 산학기술연구소논문집 Vol.- No.2
TQM이란 모든 활동을 통하여 품질의 향상을 지향하는 목표를 갖고 있다. 품질관리의 기법들은 많은 분야를 걸쳐 다양한 기법들이 개발되었으나 이를 주도하고 있는 가장 중요한 요소라고 할 수 있는 조직과 작업의 측면에서의 연구는 상대적으로 빈약하여 전무한 실정이다. 경영의 측면에서 인적자원의 효과적인 관리를 통하여 목표에 도달할 수 있는 새로운 개념을 도입하여 이를 설명한다.
유진호,손준영,안재환,박성우,김명수,장혁수 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.-
ATM(Asynchronous Transfer Mode) is a transmission technique for the B-lSDN(Broadband Integrated Service Digital Network). Congestion problems are unavoidable in the ATM networks, since various traffic typos coexist in the networks. The preventive congestion control algorithm is widely used for the real time traffics such as voice and video. The reactive congestion control algorithm works well for the non-real time traffic within a short distance. A mixed traffic control algorithm is proposed, which works either preventively or reactively based on traffic types. The proposed algorithm sets a high and low threshold value at the output buffers and modifies the EPRCA(Enhanced Proportion Rate Control Algorithm) to control loss-sensitive cells. Delay-sensitive cells are handled by the priority control and the UPC(Usage Parameter Control) algorithm. The performance analysis shows that the proposed traffic control algorithm works well for both the VBR(Variab1e Bit Rate) and ABR(Available Bit Rate) traffic with small buffers
유인술,김준식,진재우,이철주,민영기,조준필 대한응급의학회 1995 대한응급의학회지 Vol.6 No.2
We need the constitute of Emergency medical system that connect prehospital care of inhospital care effectively for optimal treatment of emergency patient. The analysis of actual condition of our emergency medical system, through study of mortality case in emergency medical center will be a aid to the constitute. The authors performed a review on the records of 60 cases who died in Ajou university Emergency medical center during management, since June 1994 to september 1995. Among the 60 patient, 72% were male and 28% were female. In nontrauma patient, 6th decade was many, in trauma patients, 3rd and 5th decade was many. Among the 60 patient, 33% were traumatic cases, 66% were nontraumatic cases. Among the traumatic patients, more than half of the cases were due to motor vehicle accidents. The most frequent time interval from onset of emergent situation to arreving at emergency center was more than 2 hours. The most common transfer method was by 119 ambulance. In most cases, prehospital treatments were not taken. In most cases, initial mental status was comatose, and systolic blood pressure was less than 60 mmHg. Most cardiovascular resuscitation was done in 30 min. to an hour. In cases as traffic accident of ischemic heart disease, where rapid transportation of the patient is critical for the patient's survival, however, in most cases it took more than two hours to bring such patients to hospital, and first aid treatment before arrival to hospital was rare. No prehospital treatment was done to nearly all patient. In many cases the patient was already in under coma or shock state. The inhospital care at emergency center was made relatively quickly and adequately. The mean duration of cardiopulmonary resustation was 30min to one hour. From this study, we could notice the poor quality of prehospital care in the region ,near Ajou university hospital, and we came to know that the improvement of quality of prehospital care was the most important factor to reduce the motality of emergency department patient. that is, in the treatment of emergency patients, weak points has been revealed in the pre-hospital treatment, the improvement of which is important factor for the survival of emergency patients.
유재우 江南大學校産學技術硏究所 2004 산학기술연구소논문집 Vol.- No.18
이 논문은 산업체의 중요한 데이터로 활용되고 있는 인체치수의 검정방법에 대하여 서술하였다. 인체치수는 일반적으로 평균과 표준편차, 그리고 1%., 5%., 50%., 90%., 95%.의 값을 활용하고 있다. 그러나 인체치수는 그 특성상 보편적으로 일정한 범위 내에서 분포하며, 인체치수의 측정과 입력과정에서 생겨나는 측정의 오류와 입력의 오류에 의하여 데이터 전체에 치명적인 영향을 미치게 된다. 이러한 데이터의 검정을 위하여 개별적인 데이터를 하나하나 검정을 하더라도 정확히 오류를 찾아내기 어려울 뿐만 아니라, 검정을 위해 엄청난 시간을 필요로 한다. 따라서 여기서 제시되는 방법은 인체치수의 비례 및 상호관계를 바탕으로 데이터의 검정을 위한 관계식과 인체치수간의 상관과 회귀관계를 활용하여 체계적으로 이를 검정하는 방법을 제시하였다. 이를 통하여 방대한 양의 데이터를 빠른 시간에 정확히 검정함으로써 데이터의 신뢰성을 높이는데 기여하였다.