비궤양성 소화불량증 환자에서 십이지장위 역류의 역할에 관한 연구

성인경(In Kyung Sung),이종철(Jong Chul Rhee) 대한소화기학회 1995 대한소화기학회지 Vol.27 No.2

N/A Backgieund/Aims: Delayed gastric emptying has been considered primary mechanism for the pathogenesis of non-ulcer dyspepsia(NUD). And duodenogastric reflux(DGR) could be involved in the pathogenesis of non-ulcer dyspepsia. But there is some controversy surrounding the role of DGR in NUD. The objective of the present prospective study was to investigate the prevalence of DGR, a possible correlation between DGR and dyspeptic symptoms and the association between DGR and delayed gastric emptying in NUD patients. Methods: Cholescintigraphy with technetium 99m 0- diisopropyl iminodiacetic acid(DISIDA) was used to study duodenogastric reflux in 105 patients with NUD and in l l normal controls. Also, in order to identify the gasric emptying rate in patients with NUD, a gastric emptying scan using solid test meal(Tc-99m-tin-colloid labeled chicken liver) was performed. Symptoms were quantified using a clinical score. Results: DISIDA scanning revealed abnorma1 findings in l(9%) of l 1 of normal controls and 31(30%) of lOS patients with NUD. The gastric emptying time of solid meal was delayed in 55(52%) of 105 patients with NUD. In the SS patients with delayed GET, DGR positive were lO(l8%) and in the 50 patients with normal GET, DGR positive were 21(42%)(p<0.05). In the 31 patients with DGR positive, patients with delayed gastric emptying were 10(32%), and in the 74 patients with DGR negative, patients with delayed gastric emptying were 45(60%). The mean symptom score was not significantly different between the patients with DGR positive and negative(8.9 ' 3.6 vs 8.3 ' 3.6). The frequency of DGR in total patients with NLJD was about 30%. And the frequency of DGR in patients of NUD with normal GET was 42%, comparing with 9% in controls(p<0.05). Conclusion: Duodenogastric retlux may be involved in the pathogenesis of non-u1cer dyspepsia with normal gastric emptying time. (Korean J Gastroenterol 1995;27:159 - 166)

변비의 분류와 치료

성인경 ( In Kyung Sung ) 대한소화기학회 2008 대한소화기학회지 Vol.51 No.1

Constipation is a common symptom affecting 2-27% of general population in Western countries. According to a population-based study on bowel habits in a Korean community, the prevalence was 16.5% for self-reported constipation and 9.2% for functional constipation. There is a broad range of causes for constipation. There are three subtypes in functional constipation, although overlap is not uncommon. Physiologic studies such as colonic transit test, anorectal manometry, balloon expulsion test, and defecography can be helpful in further evaluating and classifying functional constipation. Slow transit constipation is characterized by prolongation of transit time throughout the colon, caused by either myopathy or neuropathy. Functional defecation disorder is characterized as an inability to initiate defecation following the urge to do so, a feeling of incomplete evacuation, tenesmus, excessive straining or manual evacuation. Normal transit constipation is the most common subtype and characterized by constipation occurring in the presence of normal colonic transit time and normal defecatory function. It is important for clinicians to choose appropriate treatment for constipation which are most efficacious for the individual patient. Most patients with functional constipation respond to laxatives, but a small proportion may be resistant to this treatment. In patients with functional defecation disorder, biofeedback is helpful. Sacral nerve stimulation may be helpful in some patients with slow transit constipation. Patients who are resistant to all the conservative modalities may require surgical intervention. Extensive clinical and physiological preoperative assessment of patients with slow colonic transit time is essential before considering surgery, including an assessment of small bowel motility and identification of coexistent defecatory disorder. (Korean J Gastroenterol 2008;51:4-10)

한국성인에서 S상결장경검사로 관찰된 대장 용종의 빈도와 특성

이화영(Hwa Young Lee),김재준(Jae Jun Kim),김영호(Young Ho Kim),성인경(In Kyung Sung),전성국(Seong Gook Jeon),손희정(Hee Jung Son),이풍렬(Poong Lyunl Rhee),고광철(Kwang Chul Koh),백승운(Seung Woon Paik),이종철(Jong Chul Rhee),오영륜(Y 대한내과학회 1998 대한내과학회지 Vol.55 No.1

N/A Objectives: Colorectal polyps play an integral role in the development of colon cancer. The prevalence of colorectal polyps in Korea was reported to be 5-12%. However, these results were obtained from retrospective studies, in which the subjects were symptomatic patients. Therefore, we performed a prospective study in asymptomatic Korean adults to determine the prevalence, characteristics, and risk factors of colorectal polyps. Methods Flexible sigmoidoscopy was done during the period between August 1994 to November 1995 in 2,985 aymptomatic individuals who visited Samsung Medical Center for health check-ups. Results : 1) Polyps were found in 590 subjects (20.4%) out of 2,985 individuals. The prevalence rate increased with age. 2) In histologic findings of colorectal polyps, there were 369 cases (45.8%) of adenomatous polyps, 245 cases (30.4%) of hyperplastic polyps and 5 cases of carcinomas. 3) Moderate to severe dysplasia was found in 15.4% of adenomatous polyps and the grade of dysplasia increased with polyp size. 4) The prevalence rate of polyps increased according to obesity, blood cholesterol and triglyceride level, the frequency of alcohol consumption and the amount of smoking in cases. Conclusions: Screening by sigmoidoscopy is considered to be beneficial for detection of colorectal polyps in asymptomatic Korean adults, especially in individuals with risk factors such as obesity, heavy smoking and alcohol consumption.

초·중등 수송 기술 교육 관련 연구 동향 분석

김성인(Sung-In Kim),윤지아(Ji-A Yoon) 대한공업교육학회 2022 대한공업교육학회지 Vol.47 No.3

이 연구의 목적은 초․중등 수송 기술 교육에 관련된 연구 논문을 수집 및 분석하여 연구 동향을 파악하고, 향후 연구가 필요한 분야와 방향을 제시하는 것이다. 이를 위해 ‘연구 시기’, ‘연구 대상’, ‘연구 주제’, ‘연구 방법’, ‘연구자 특성’ 의 5개 항목으로 관련 논문을 분석하였으며, 연구의 결과는 다음과 같다. 첫째, 수송 기술 교육 관련 연구는 2002년부터 2022년 2월까지 총 81편의 연구가 이루어졌는데, 이는 생명 기술이나 발명 등 다른 분야에 비해 연구물이 적은 편이다. 둘째, 수송 기술 교육 관련 연구는 주로 초·중·고등학생과 문헌을 대상으로 이루어졌으며, 교사 및 예비 교사를 대상으로 이루어진 연구는 부족한 편이다. 셋째, 수송 기술 교육 관련 연구의 주제는 교수·학습 자료 개발과 교육과정, 교과서가 대부분이었고 교육 평가, 시설 및 설비, 태도와 인식, 교육 철학에 대한 연구는 저조하였다. 교수·학습 자료 개발의 하위 주제를 살펴보면 육상 수송 기술과 신재생에너지에 관한 연구가 많았고 해상 수송 기술과 우주항공 수송 기술, 동력 기관에 관한 연구는 비교적 적은 편이었다. 넷째, 수송 기술 교육 관련 연구의 방법은 문헌 연구와 양적 연구가 대부분이었다. 혼합 연구가 수행된 논문도 일부 있었지만 질적 연구를 활용한 논문은 전무하였다. 다섯째, 수송 기술 교육 관련 연구는 단독 연구자에 의한 논문이 가장 많았으며 2인이 연구한 논문이 그 뒤를 이었다. 연구자는 관련학과 교수와 현직 교사가 대부분이었으며 연구소 소속은 매우 적었고 산업 현장의 전문가는 전무하였다. 이상의 연구 결과를 토대로 향후 초·중등 수송 기술 교육 연구에서는 연구 대상, 연구 주제, 연구 방법의 측면에서 다양성을 추구하여 수송 기술 교육의 개선을 도모해야 할 것이다. 또 급변하는 기술 발전을 반영하기 위해 산업 현장의 전문가, 교사, 교수 등 다양한 연구자가 함께 연구를 이어나갈 필요가 있을 것이다. 나아가 2022 개정 교육과정이 추후 확정되어 개정·고시되면 이 연구의 결과를 토대로 새로운 교육과정에서 수송 기술 교육 연구는 어떤 방향으로 이루어져야 할지 고민할 필요도 있을 것이다. This research is aimed at collecting and analyzing research papers on transportation technology education in elementary and secondary schools, to analyze research trends, and to present the fields that require research in the future and the directions of such researches. The results were as follows: First, a total of 81 researches on transportation technology education were conducted from 2002 to February 2022, which indicated that the outcomes were less than those in biotechnology, invention, and other fields. Second, the research on transportation technology education was carried out on both elementary, middle and high school students, and literature. Meanwhile, less research was conducted on teachers and pre-service teachers. Third, the research was fully conducted on the development of teaching and learning materials, curriculums, and textbooks as its theme, but was poorly conducted on educational evaluation, facility and equipment, attitude and perception, and educational philosophy. Fourth, the research extensively employed literature reviews and quantitative research. Some papers used mixed-method research; however, no paper utilized qualitative research. Fifth, in the research on transportation technology education, most papers were compiled solely by one researcher, and then followed by two researchers. Researchers engaged fully with the relevant department professors and in-service teachers. Based on the above results, more research on transportation technology education in elementary and secondary schools is needed to improve the education on transportation technology by enhancing diversity in the aspects of research subject, theme, and methods. To reflect rapid advances in technology, it is also necessary to continue conducting research along with various researchers, such as professionals in industrial sites, teachers, professors, etc.

비궤양성 소화불량증 환자의 아형분포에 대한 연구

성인경(In Kyung Sung),강인구(In Ku Kang),심승철(Seung Chul Shim),김종필(Jong Pil Kim),이기창(Kee Chang Lee),손정일(Chong Il Sohn),정철헌(Chul Hun Jung),박동일(Dong Il Park),이종철(Jong Chul Rhee) 대한내과학회 1994 대한내과학회지 Vol.46 No.3

N/A Objectives: It has been proposed that patients with non-ulcer dyspepsia can be classified into symptom subgroups. Subgroups were as follows; those with symptoms suggestive of peptic ulceration (ulcerlike dyspepsia), those with gastric stasis (dysmotilitylike dyspepsia), those with gastroesophageal reflux (refluxlike dyspepsia), and the remainder (unspecified dyspepsia). Methods: The study population consisted of 306 patients with non-ulcer dyspepsia admitted to or attending to Hanyang University Hospital from the beginning of Feb. 1990 to the end of August 1992. We evaluated the gastrointestinal symptoms and measured gastric emptying time for 150min using radionuclide scintiscan of an 99mTc-labeled chicken liver. Results: 1) A total of 306 patients with diagnosed to non-ulcer dyspepsia, 54% had dysmotilitylike dyspepsia, 16% had ulcerlike dyspepsia, 2% had refluxlike dyspepsia and 10% had unspecified dyspepsia. 2) A total of 148 non-ulcer dyspepsia patients with normal gastric emptying time, 48% had dysmotilitylike dyspepsia, 19% had ulcerlike dyspepsia, 2% had refluxlike dyspepsia and 10% had unspecified dyspepsia. 3) A total of 158 non-ulcer dyspepsia patients with delayed gastric emptying time, 61% had dysmotilitylike dyspepsia, 14% had ulcerlike dyspepsia, 2% had refluxlike dyspepsia and 9% had unspecified dyspepsia. 4) Dysmotilitylike dyspepia was more commonly present in patients with delayed gastric emptying time than in patients with normal gastric emptying time(p<0.05) 5) There was a slight female predominance (1:1.3 male-female ratio) in non-ulcer dyspepsia patients with normal gastric emptying and peak incidence was 40 to 49 years of age (40%). 6) There was a female predominance (1:1.9 male-female ratio) in non-ulcer dyspepsia patients with delayed gastric emptying and peak incidence was 40 to 49 years of age(42%). 7) A total of non-ulcer dyspepsia patients, 35% had irritable bowel symptoms and the frequency of accompanied irritable bowel symptoms was statistically significant difference between the patients with normal gastric emptying time (46%) and the patients with delayed gastric emptying time (26%)(p<0.01). Conclusion: Among the non-ulcer dyspepsia patients in Korean, dysmotilitylike dyspepsia was most common subgroup and the refluxlike dyspepsia was very rare and 35% had irritable bowel syptoms.

단동 플라스틱 온실의 천창 환기효과와 설치기준 분석

남상운(Sang-Woon Nam),김영식(Young-Shik Kim),고기혁(Gi-Hyuk Ko),성인모(In-Mo Sung) 충남대학교 농업과학연구소 2012 농업과학연구 Vol.39 No.2

Dimensions, operation conditions and improvement items for round roof windows were investigated in arch shape single-span plastic greenhouse with roof vents, and natural ventilation performance was analyzed based on the ventilation theory. Diameter of round roof windows was mostly 60 ㎝, and chimney height projected on roof was average 30 ㎝. Installation space was mostly 5 to 6 m but farmhouse of 10 m and over was 16.7% also. A round roof window which has 60 ㎝ diameter was installed to 6 m space generally and 80 ㎝ diameter was installed to 10 m space, but correct standards did not exist. There were a lot of opinions that ventilation effect of round roof windows is fairly good and user satisfaction is generally excellent. It is problem that there is few effects in summer and that vinyl around each vent tears well and rainwater leaks, and improvement hope item required development of automatic control system. In the wind speed of 0.3 ㎧, it was estimated that natural ventilation rates were 0.69, 0.55, 0.50 and 0.48 volumes per minute in case of 2, 4, 6 and 8 m installation space for round roof windows, respectively. It was analyzed that the ratio of ventilation due to buoyancy out of total ventilation were 65.2, 41.9, 29.9 and 22.8% in case of 2, 4, 6 and 8m installation space, respectively. By the round roof windows installed at space of 6 m, ventilation rate was estimated to 0.5 volumes per minute, and we can expect the increase in ventilation rate of 30%. In order to meet the recommended ventilation rate for summer season, we have to install the round roof windows at space of 1 to 2 m. However, it is difficult to apply those installation space because of falling productivity due to lower light transmittance as well as rising costs. It is estimated that the installation space of 6m is appropriate for spring or fall season. Therefore it is necessary to encourage installing the roof windows in single-span plastic greenhouses.

모틸린에 의한 사람 위 평활근의 수축 기전에 관한 연구

심상군(Sang Goon Shim),이종철(Jong Chul Rhee),이풍렬(Poong Lyul Rhee),최규완(Kyoo Wan Choi),전성국(Sung Kook Jeon),강동묵(Tong Mook Kang),엄대용(Dae Yong Uhm),이종석(Jong Seok Lee),성인경(In Kyung Sung),김현서(Hyun Seo Kim) 대한소화기학회 2002 대한소화기학회지 Vol.39 No.1

Background/Aims: Motilin is an intestinal peptide that stimulates the contraction of gut smooth muscle. A discrepancy exists between the in vivo (neurally mediated) and in vitro (direct action on a smooth muscle receptor) mechanisms of motilin action in many species. We investigated in vitro mechanisms of motilin action on human gastric smooth muscle. Methods: Antral cirular muscle strips of the surgical tissue obtained during gastrectomy, were used to measure contractile force and electrical activity. Dispersed muscle cells were used to measure L-type Ca2+ current and electrical activity. Results: Motilin of 1-100nM contracted smooth muscle in a concentration-dependent manner. Motilin-induced contractions were unaffected by tetrodotoxin or atropine treatment. Nifedipine or Ca2+-free bath solution blocked motilin (10nM)-induced contractions. Low concentration of motilin (1nM) resulted in an increase in acetylcholine (0.1~100M)-induced contractions. By patch clamp recording technique, motilin (1 or 10nM) did not modify the L-type Ca2+ current, but motilin-induced membrane depolarization was detected. Erythromycin also contracted smooth muscle with membrane depolarization but verapamil inhibited the contraction. Conclusions: These results suggest that motilin contracts smooth muscle through a direct action on smooth muscle receptor and Ca2+ influx through the L-type Ca2+ channel, which is due to membrane depolarization, also mediates motilin-induced contractions. (Korean J Gastroenterol 2002;39:4-12)

음주가 한국인 성인의 혈청 항헬리코박터 항체 전환에 미치는 영향에 대한 연구

권현경 ( Hyun Gyung Kwon ),이선영 ( Sun-young Lee ),김지혜 ( Ji Hye Kim ),이상표 ( Sang Pyo Lee ),김정환 ( Jeong Hwan Kim ),성인경 ( In-kyung Sung ),박형석 ( Hyung Seok Park ),심찬섭 ( Chan Sup Shim ) 대한내과학회 2018 대한내과학회지 Vol.93 No.3

목적: 헬리코박터 파일로리 균에 대한 혈청전환의 위험성은 감염된 가족과 거주하거나 상부위장관 내시경 검사를 받으면 상승한다. 우리나라에서는 음주가 혈청전환의 위험요인으로 알려져 있으나, 외국에서는 이와 상반된 연관성을 보인다. 이에 본 연구에서는 한국인에서 혈청전환을 유발하는 위험 요인을 분석하고, 음주량이 혈청전환에 미치는 영향력을 조사하였다. 방법: 혈청 항헬리코박터 파일로리 항체 검사에서 음성을 보인 한국인 성인 중 매년 혈청항체에 대한 추적 검사를 하면서 혈청 펩시노겐 검사와 상부위장관 내시경 검사를 함께 받은 사람을 대상으로 하였다. 위 절제술이나 제균 치료를 받은 사람은 대상에서 제외하였다. 심한 음주자는 일주일에 15잔 이상을 마시는 남자와 8잔 이상을 마시는 여자로 정의하였다. 결과: 항체 음성자 267명 중 26명(9.7%)이 혈청전환을 보였으며, 평균 추적 기간은 39.0 ± 19.1개월이었다. 혈청전환율은 음주량(p = 0.001), 비스테로이드성항염증제 복용력(p =0.015), 높은 체질량지수(p = 0.033), 긴 추적 기간(p = 0.038), 많은 추적 검사 횟수(p = 0.004)와 비례해서 증가하였다. 이중에서 심한 음주자(OR 6.754, 95% CI 1.892-24.102, p = 0.003)와 보통 음주자(OR 4.360, 95% CI 1.130-16.826, p = 0.033)만이 혈청전환의 독립적인 위험 인자로 밝혀졌다. 추적 검사시의 혈청 펩시노겐 II 수치는 혈청전환자(12.0 ± 7.8 ng/mL)가 대조군(9.1 ± 5.3 ng/mL)에 비해서 높았다(p = 0.038). 결론: 한국인에서 음주는 혈청전환과 연관된 주요 위험인자이다. 이는 음주를 줄이고 비위생적 음주 습관을 개선하는 것이 한국인 성인들 사이에서 헬리코박터 파일로리균의 전염을 예방하는데 도움이 될 수 있다는 것을 시사한다. Background/Aims: Helicobacter pylori (H. pylori) seroconversion may develop in seronegative adults. Although a positive correlation has been reported between alcohol consumption and seroconversion in Korea, an inverse correlation has been reported in other countries. The aim of this study was to investigate the risk factors for seroconversion in Korea. Methods: We included Korean adults who were H. pylori-negative negative in their annual serum immunoglobulin G and pepsinogen assays, and in upper gastrointestinal endoscopy. Subjects with a history of H. pylori eradication or gastrectomy were excluded. The criteria for heavy alcohol consumption were ≥ 15 drinks/week for males and ≥ 8 drinks/week for females. Results: Of 267 H. pylori-seronegative subjects, 26 (9.7%) exhibited seroconversion at a mean follow-up time of 39.0 ± 19.1 months. Seroconversion was positively correlated with alcohol consumption (p = 0.001), nonsteroidal anti-inflammatory drug use (p = 0.015), a higher body mass index (p = 0.033), a longer follow-up period (p = 0.038), and a greater number of follow-up tests (p = 0.004). Heavy drinking (odds ratio 6.754, 95% confidence interval 1.892-24.102, p = 0.003) and social drinking (odds ratio 4.360, 95% confidence interval 1.130-16.826, p = 0.033) were independent risk factors for seroconversion. During follow-up, subjects with seroconversion had higher serum levels of pepsinogen II (12.0 ± 7.8 ng/mL) than others (9.1 ± 5.3 ng/mL) (p = 0.038). Conclusions: Alcohol consumption is related to seroconversion in Koreans. H. pylori transmission might be prevented by reducing alcohol consumption and controlling drinking habits. (Korean J Med 2018;93:277-284)

미숙아의 신생아 경련

박주형(Joo Hyung Park),정인아(In Ah Jung),한지윤(Ji Yoon Han),성인경(In Kyung Sung),이주영(Ju Young Lee),윤영아(Young Ah Youn),이인구(In Goo Lee) 대한소아신경학회 2012 대한소아신경학회지 Vol.20 No.3

배 경 : 신생아기에는 뇌의 미성숙으로 인하여 경련이 일생 중 가장 흔히 발생하며, 특히 미숙아에서 경련의 발생 빈도가 높다. 신생아 집중 치료가 발전하면서 미숙아의 생존율이 향상되었지만, 생존한 미숙아들의 신경학적 후유증의 빈도 역시 증가되었다. 이에 저자들은 미숙아로 출생하여 경련을 일으킨 환아들을 대상으로 병력, 임상 양상과 검사 소견을 분석하고 그에 따른 예후를 관찰함으로써 미숙아 경련의 특징과 위험인자들을 알아보고자 하였다. 방 법 : 2009년 3월에서 2012년 2월까지 서울성모병원 신생아 중환자실에 입원한 재태 연령 37주미만으로 출생한 환아 중 경련이 발생한 환아 16명을 대상으로 후향적 조사를 시행하였다. 결 과 : 재태 연령 30주 미만의 환아에서 신생아 경련 발생률이 높았고, 경련의 발생 시기는 생후 1주일 이내가 많았으며, 경련 형태는 비정형적 경련이 많아 일반적인 신생아 경련과 동일하였다. 뇌파검사에서는 75%에서 비정상 소견을 보였는데, 대부분이 간질모양파를 보였고(77.8%) 나머지는 배경파가 억제되어 있었다. 뇌 영상 검사에서는 62.5%에서 이상 소견을 보였는데, 대부분이 뇌실 내 출혈(80%) 이었다. 경련의 위험인자로는 절반의 환아에서 출생 시 가사가 관찰되었고, 주산기 병력을 가진산모인 경우도 43.8%를 차지하고 있었다. 경련을 조절하기 위하여 phenobarbital, phenytoin, 그리고 midazolam을 사용하여 대부분(76.9%)은 조절되었고, 조절 될 때까지의 기간은 평균 4.3±4.2일 이었으나 3명은 사망 시까지 경련이 조절되지 않았다. 항경련제의 투약을 중지할 때까지 걸린 시간은 평균 53.4±28일 이었다. 그리고 추적 관찰 기간 중 경련을 경험한 미숙아의 절반 이상이 정상 발달을 보이고 있었다. 결 론 : 출생 시 가사가 미숙아의 신생아 경련 발생에서 가장 중요한 인자로 생각 되지만 산모의 주산기 병력 역시 신생아 경련 발생과 밀접한 연관성이 있을 것으로 추정된다. 따라서 산모가 주산기 병력이 있는 경우에는 출생 미숙아에 대한 면밀한 관찰과 검사를 통해 경련을 조기에 발견하여 치료할수 있도록 하여야 하며, 이를 위해 뇌파검사가 보다 더 적극적으로 이용되어야 한다. Purpose : Neonatal seizures are the most prominent feature of neonatal neurologic dysfunction, and the lifespan risk for seizures is highest in the neonatal period, especially in preterm infants. This study was aimed to find and analyze the risk factors and clinical profiles of seizures in preterm infants. Methods : Sixteen cases of preterms with seizures were retrospectively reviewed between Mar. 2009 and Feb. 2012. Results : The average gestational age was 30.3±4.1 weeks and 11 patients (68.7%) experienced seizures within 1 week after the birth. Eight cases (50%) had a perinatal asphyxia during the delivery and 7 cases (43.8%) had a history of perinatal maternal illness. Various types of seizures were observed of which subtle seizures were the most common (50%). Electroecephalographies were performed in 12 cases, which showed abnormal findings in 9 cases (75%). Neuroimaging studies were performed in 16 cases and showed abnormal findings in 10 cases (62.5%). Thirteen patients were discharged in the improved state and 3 patients expired. Eight cases had normal outcome, while 3 cases showed developmental delay. Prognosis was unknown in 2 cases due to follow up loss. Conclusion : Neonatal asphyxia is the most important risk factor. Furthermore, infants with a history of perinatal maternal illness appear to be at risk for neonatal seizures. EEG is a sensitive method for assessing seizure activity and prognosis. Monitoring high risk infants with asphyxia and a history of perinatal maternal illness, and early postnatal tracing with EEG is required to detect and manage high risk preterms.

사용현장 데이터를 이용한 군 운용 환경에서의 상용품목 신뢰도 예측

임태진,박준수,고병성,성인철,조문수,김성철,Lim, Tae-Jin,Park, Joon-Soo,Ko, Byoung-Sung,Sung, In-Chul,Cho, Moon-Soo,Kim, Sung-Chul 한국국방경영분석학회 2010 한국국방경영분석학회지 Vol.36 No.1

상용품목을 군용환경에서 적용하면 저비용, 빠른 조달시간, 기술적 발전 등 여러 가지 이점이 있다. 반면에 상용 제품, 표준, 관행 등이 군용 요구조건에 미달됨으로 인하여 신뢰도 및 병참 상의 문제가 발생할 수도 있다. 또한 상용 공급자들은 군용 병참을 지원하는데 필요한 기술적 자료를 제공한 경험이 거의 없을 수도 있다. 보다 많은 회사들이 제품 관련 데이터 수집 시스템을 구축하고 있어 상당한 분량의 사용현장 보증 데이터가 수집되었다. 사용현장 데이터는 전형적으로 주기별 판매량과 클레임 건수로 구성된다. 본 연구에서는 군용환경에서 작동하는 군용설비, 군용환경에서 작동하는 상용설비, 상용환경에서 작동하는 상용설비 등 세 가지 유형의 데이터를 고려하였다. 최대우도 기준 및 최소제곱 기준에 기초한 제품 신뢰도 추정 방법을 제안하고, 각 유형의 데이터에 대한 추정 모형을 구축하고 상용환경에서 군용환경으로 전환하는 신뢰도 변환방법을 제안하였다. 사례연구를 통하여 제안된 방법의 적용 가능성을 검증하였다. Adapting commercial equipments to military operations may provide the advantage of low cost, reduced acquisition time, and technology advancement. On the other hand, it may also offer the opportunity for a reliability and logistics risk because commercial products, standards, and practices may not meet military requirements. In addition to this, commercial vendors have little experience in providing the technical data required to support military deployment logistics. As more companies are equipped with data aquisition systems for their products, considerable amount of field warranty data has been accumulated. Typically, the field data for a given product comprise with the sales volume and the number of the claims for each period. Three types of product data are considered in this study: military designed equipment operating in a military environment, commercial equipment operating in a military environment, and commercial equipment operating in a commercial environment. We construct a estimation model for each type of data and propose an reliability transform method from a commercial environment to a military environment. Parametric methods for estimating the product reliability are proposed based on maximum likelihood criteria and least square criteria. Then a reliability transform procedure for handling different types of data is proposed in a consistent fashion. A case study is investigated to characterize our model based on a real field warranty data set.