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이강산 한국산학기술학회 2022 한국산학기술학회논문지 Vol.23 No.8
Various manufacturing companies are performing FMEA for Reliability Assurance. FMEA provides a means of preventing possible failures during product development and manufacture. Risk is calculated by multiplying severity, occurrence, and detectability. However, the relative importance of these factors depends on industry, product, and process. In this paper, the relative importance of severity, occurrence, and detection of military pyrotechnics produced by ㅇㅇ Corporation were calculated using AHP. In addition, a case application of FMEA was applied to the manufacture of an electric detonator. As a result, the relative importance of these factors was ranked in descending order as; severity, occurrence, and detection. Furthermore, the study shows that factor priorities derived by FMEA and FMEA plus AHP differ. 다양한 제조업 분야에서는 제품의 신뢰성 보증을 위해 FMEA를 수행하고 있다. FMEA는 제품의 개발 및 공정에서 발생할 수 있는 고장을 구조화하여 사전에 방지하는 방법이다. FMEA에서는 고장의 위험 수준을 파악하기 위해 심각도, 발생도, 검출도 항목을 곱해서 위험 우선순위를 산정한다. 그러나 산업별/제품별/공정별로 심각도, 발생도, 검출도의 상대적 중요도가 모두 다를 수 있다. 본 논문에서는 ㈜ㅇㅇ에서 생산 중인 군수용 화공품 분야에 대한 심각도, 발생도, 검출도의 상대중요도를 산출하였고, 이를 위해 AHP를 활용하였다. 또한, 군수용 화공품의 일종인 전기식 뇌관의 제조공정 FMEA에 사례적용을 실시하였다. 연구 결과 군수용 화공품 제조 공정 분야에서는 심각도, 발생도, 검출도 순으로 높은 상대중요도를 나타냈다. 또한 사례적용 결과 기존 FMEA 수행을 통해 도출된 위험 우선순위와 AHP가 적용된 FMEA를 통해 도출된 우선순위가 다르다는 것을 확인할 수 있었다.
이강산,신동엽 한국인사ㆍ조직학회 2010 한국인사ㆍ조직학회 발표논문집 Vol.2010 No.1
The current paper employs a macro organization theory perspective to explain one of the most representative market phenomena; i.e. price formation. Specifically, we empirically examine the effects of a social variable frequently studied in the organization theory literature ? i.e. status - as a signal on the price formation of cultural products the qualities of which are hard to ascertain in advance, using an original data-set of fine art auctions. We predict that when there is a high level of uncertainty about the quality of a product, the market performance of the product will be affected significantly by social factors that may serve as quality signals, such as the status position of its producer. However, we predict that status among lay consumers and status among professional experts will have different signaling effects on price formation in markets. According to the results of our empirical study that analyzed the records of all the artworks traded at a major Korean auction company, 1998-2007, the price of an artwork sold at an auction as a market performance was found to be affected positively by the market status of the artist. We also found that high market status reduces the negative effect of professional status on prices. General implications are discussed.
이강산,함운철 제어로봇시스템학회 2016 제어로봇시스템학회 각 지부별 자료집 Vol.2016 No.01
In this paper, we shows procedure making PAT image reconstruction using CPU and CUDA based on paper who written by K.P.Kostli.
대장암 진단을 받은 75세 이상의 환자군에서의 복강경 수술의 유용성
이강산,김영완,김주희,권현준,김익용 대한내시경복강경외과학회 2012 Journal of Minimally Invasive Surgery Vol.15 No.4
Purpose: Colorectal resection for elderly patients is associated with significant morbidity and mortality. It is still unclear whether or not laparoscopic colorectal resection (Lap CR) is indicated in elderly patients. The aim of this study is to evaluate the outcome of colonic surgery in elderly patients and to assess the feasibility and safety of laparoscopic colorectal surgery in elderly patients. Methods: Patient characteristics and perioperative and pathologic data on 295 patients who underwent Lap CR for cancer from Jan. 2004 to Aug. 2011 were prospectively collected. Exclusion criteria were emergency and palliative bypass surgery. Outcomes for elderly patients (≥75 years) were compared with those of younger patients (<75 years). Results: In comparison of 257 younger patients (<75 years, median age 61 years), 38 elderly patients (≥75 years, median age 79 years) showed a greater proportion off emale gender (52.6% vs. 37.0%, p=0.065) and American Society of Anesthesiologists score 2∼3 (97.3% vs.42.0%, p<0.001). No differences in tumor location, median operative time, conversion rate, duration of hospital stay, and perioperative complications (23.7% vs. 30.0%, p=0.427) were observed between the two groups. Distributions of American Joint Committee on Cancer stages and number of harvested lymph nodes were comparable between groups. Conclusion: Although elderly patients are more likely to be affected by co morbidities, postoperative outcome in this group after Lap CR is comparable with that of younger patients. Use of Lap CR in elderly patients is safe, and is associated with a low morbidity. It should be also regarded as the optimal approach for very elderly patients.
이강산,손종렬,박영옥 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
We fabricated and compared two high-temperature and high-pressure dust collector models: theconventional direct inletmodel, where a round gas inlet pipe is connected to the bottom of the collectorat a right angle; and the inertial inlet model, where a rectangular gas inlet pipe is tangentially connected. Their effects on the filtration performance of a ceramic candle filter were tested at 800 8C and 3 atmandcompared. The inertial inlet model showed a slower increase in pressure drop as the filtering processprogressed owing to the reduced dust load on the filter. The average cleaning interval was 4–7 timeslonger than that of the direct inletmodel. The residual pressure drop increased in direct proportion to thefiltration velocity and was about twice that of the inertial inlet model. The inertial inlet maintained ahigher cleaning efficiency during operation than the direct inlet. The overall collection efficiency wasover 99.999% with the inertial inlet model, allowing for slight variations according to the filtrationvelocity, and that of the direct inlet method was over 99.9% under the same conditions.