• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 E
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• pp.2377-2379
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• 1999

In order to analyze failure rates of underground transmission power cable systems in Korea, the survey has been performed for the failure cases of cables, joints, and terminations in CV, OF and POF cable systems which occurred from 1983 to 1998. During 16 years, the failure cases due to trips of the systems were 47 among the total 108 cases, These 47 cases could be divided into internal reasons(manufacture/installation, corrosion and degradation) of 16 cases and external reasons (external mechanical damages, lightning, fire. etc.) of 31 cases. For the 154 kV cable systems during 12 years from 1987 to 1998, total failure rate was 0.0057 [case/100C-km/year] and internal reason failure rate was 0.0020 [case/100C-km/Year], which is similar to those of foreign countries. Also, the many cases of internal reason failures occurred in the early stage after the operations due to incorrect installations. This implies that the installation process is very important and some diagnostic tests such as PD measurement are needed besides after laying test.

• 품질경영학회지
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• 제47권3호
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• pp.641-659
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• 2019

Purpose: Recently, the managing customer complaints properly has emerged as key source of competitive advantage in the large distribution industry. Effective customer complaint management helps firms minimize service failures and incense the capability to respond to customer's needs. Despite this importance, the in-depth prior study of a firm's service failures is very limited. Therefore, the actual service failure cases of large discount stores in Korea were analyzed in this study, and the types of service failures that occur at the service interface were identified. Method: Specifically, a total of 48,307 cases of customer complaints that have occurred in the past three years were collected from 1 January 2016 to 31 December 2018. Using 7 dimensions of service marketing mix. we have classified and analyzed systematically the service failure cases collected. Results: Among the cases of service failures, 34,921 (72.3%) cases were involved with the product factor, followed by 6,152 (12.7%) cases with person factor and 5,392 (11.2%) cases with process factor. Conclusion: By linking the main causes of service failure with the service marketing mix variables, this research presented a more systematic analytic model and verified by applying it to large domestic distribution company. Understanding the main factors affecting customer complaints n the large distribution industry can provide managers useful information and insight who want to achieve an effective customer complaint management.

• Journal of Chest Surgery
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• 제14권4호
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• pp.319-323
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• 1981

To clarify the clinical spectrum of non-oliguric acute renal failure, we undertook a retrospective study of 16 cases of acute renal failure following trauma and surgery, 6 of whom were non-oliguric throughout their periods of azotemia. With the clinical symptoms, BUN, creatinine and some urinary diagnostic indexes, we analyzed the differences between non-oliguric and oliguric renal failure. And the results were: 1. The nonoliguric form [10 cases] was more common than oliguric [6 cases], especially post-traumatic failure. 2. The both types belonged to parenchymal renal failure by the U/P UN ratio and urinary Na concentration [Vertal, 1967]. 3. The non-oliguric form was lesser severe in urinary diagnostic indexes and clinically. The non-oliguric renal failure has better clinical course and prognosis, the failure to diagnose it is as dangerous as the failure oliguric renal failure.

• Journal of Chest Surgery
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• 제22권1호
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• pp.123-133
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• 1989

A clinical evaluation was done on 182 cases of chest trauma which experienced at the Department of Thoracic and Cardiovascular Surgery, National Medical Center, from Sep. 1980 to Dec. 1987. 1] Of 182 cases, 125 cases resulted from non-penetrating chest trauma and 57 cases from penetrating wound. 2] The ratio of male to female was 4.87:1, and age groups between 3rd and 6th decade were 71.9%. 3] The most common causes of chest trauma were traffic accident in non-penetrating and stab wound by knife in penetrating cases. 4] Left thorax was the preferred site of chest injury. 5] The incidences of hemothorax, pneumothorax, and hemopneumothorax were 69.6% in non-penetrating and 91% in penetrating. 6] Rib fractures between 4th rib and 8th rib were 68.8% of total rib fracture cases and left side was preferred site. 7] Methods of treatment were conservative management in 24.7%, closed thoracostomy in 54.9%, open thoracotomy in 14.3%, and etc. 8] The incidence of complications, were 11.5% of total cases, and they were atelectasis [8 cases], empyema [3 cases], pneumonia [3 cases], acute renal failure [2 cases], lung abscess [1 case], and etc. 9] The overall mortality was 6%, and causes of death were hypovolemic shock, renal failure, hepatic failure, respiratory failure, septic shock, and etc.

• Journal of Chest Surgery
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• 제19권1호
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• pp.92-100
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• 1986

Results of reoperation for tissue valve failure were presented with review of current knowledge. Through January 1986, 19 patients required reoperation: 18 had undergone mitral, 2 aortic, and 1 tricuspid valve. Primary tissue failure was the main cause of tissue valve failure: it occurred in 18 valves [15 mitral, 2 aortic, and 1 tricuspid] at a mean postoperative interval of 54-25 months [range 29-120]. During the same period, 2 patients required reoperation for prosthetic valve endocarditis, 1 for paravalvular leakage. The types of valves failed were 12 lonescu-Shiley valves, 5 Hancock valves, and 1 Carpentier-Edwards valve. All 6 patients younger than 15 years of age at first operation had been implanted with lonescu-Shiley valves and failed after a mean interval of 35 months. In contrast, 11 patients older than 15 years had been implanted with 5 Hancock, 6 lonescu-Shiley, and 1 Carpentier-Edwards valve initially, and eventually failed after mean intervals of 81, 53, 47 months each other. The kinds of valves used at reoperation were 8 lonescu-Shiley, 4 Bjork-Shiley, and 6 St. Jude Medical valves for primary tissue failure cases and 3 lonescu-Shiley valves for the other 3 cases. Overall mortality at reoperation was 10%: 5.6% for primary tissue failure, 50% for prosthetic valve endocarditis. In 15 cases [all mitral] primary tissue failure were caused by calcification associated with or without leaflet destruction or fibrous ingrowth, and in 2 cases [all aortic] caused by cusp perforation and tearing without any evidence of calcification. In conclusion: 1 primary tissue failure is the main cause of reoperation in patients with tissue valve failure; 2. the majority of the failed valves is in mitral position; 3. leaflet calcification is the leading pathology of primary tissue failure; 4, reoperation for tissue valve failure may be a major concern, although the mortality is low; 5. the limited durability of tissue valve suggests its use be restricted to selected cases.

• Asian Journal of Innovation and Policy
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• 제3권1호
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• pp.25-49
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• 2014

We wanted to show the different group dynamics of factors for success and failure cases for technology commercialization in small technology-based firms. Existing studies are based on product level, project level, division level or firm level. We deal with technology level, and at small-technology-based firms. This is a longitudinal case study based on 8 cases from Korea. Our study on technology level is a first trial in success and failure studies unlike all existing studies. As a first step, we introduced new categories and factors such as technology attributes and CEO reflecting data, and especially a new concept of launch readiness level. Finally, we adopted correspondence analysis to show the group dynamics. The results are as follows; Technology factors are the most important factors. Second, resource-based factors are more critical in failure cases than success cases and technology factors are more critical to success.

• 대한한방부인과학회지
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• 제29권1호
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• pp.116-126
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• 2016

Objectives: The purpose of these cases is to report the effects of oriental medicine on two patients with premature ovarian failure. Methods: Two patients who had amenorrhea and hot flashes caused by premature ovarian failure were treated by oriental medicine such as herb medication. We estimated the effects of treatments by follow-up measurements of serum hormone level, menstrual cycle and symptoms. Besides, follicle and endometrium were checked by ultrasonography for academic research.Results After treatments, their symptoms of premature ovarian failure were improved and the menstrual cycle resumed. And the level of serum Follicle Stimulating Hormone decreased and the level of serum E₂ increased.Conclusions Two cases shows that oriental medicine has effects on patients with premature ovarian failure by follow-up measurements of serum hormone level, menstrual cycle and symptoms.

• Clinical and Experimental Reproductive Medicine
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• 제21권2호
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• pp.221-226
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• 1994

Copper T 380A intrauterine devices were inserted to nine thousand and nine hundred twenty women by 51 KAVS-member physicians since January 1, 1993 through December 31, 1993. This study was undertaken for the clinical analysis on a total of 9,920 women wearing Copper T 380A to grasp the effectivness as well as the expulsion rate due to a various side effects. The following features were the results of the study: 1. During the twelve months period, from January 1993 to December 1993, the largest number of IUD insertion per one physician is 740 cases and the smallest number 60 cases, the mean 195 cases. 2. After insertion of Copper T 380A, a total of 117 cases were removed the IUD;81 cases(0.8%) were due to extensive bleeding and 36 cases(O.36%) were due to pain. The pregnancy failure rate represented comparatively lower rate, 0.08% (8 cases) and the expulsion rate was 0.06%(6 cases). 3. The removal rate of Copper T 380A was different by physicians. The highest removal rate for bleeding was 3.13% and 13 physicians(25.5%) did not experience any bleeding cases. 4. For the removal rate for pain, 30 physicians(58.8%) did not experience any removal of IUD due to pain while 21 physicians(41.2%) removed IUD due to pain: 17 physiciansC33.4 %) had 0.1-1.5% of removal rate and 4 physiciansC7.0%) had 1.6-2.1% of removal rate. 5. A total of 43 physicians(84.3 %) did not experience any pregnancy failure case while 8 (15.7%) physicians was experienced pregnancy failure rate. Four physicians(7.8%) had 0.1-0.5% of pregnancy failure rate and 4 physicians had 0.6-1.0% of pregnancy failure rate. 6. Expulsion rate showed comparatively lower, 0.06% in this study. A total of 45 physicians (88.2%) did not experience any expulsion cases while 6 physicians(11.7%) had expulsion rate with the highest expulsion rate of 2.0%.

• 지식경영연구
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• 제16권2호
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• pp.91-111
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• 2015

Social media marketing has gained attention from marketers due to the growing number of social media users. Marketers around the globe have a serious concern over how to utilize social media as a successful marketing tool. Many of them show a lack of understanding of the essential feature of social media and effective social media marketing strategies, which brings about a higher chance of social media marketing failures. Analyzing the failure cases of social media marketing is vital because it provides rich insights for marketing experts who have difficulty in developing effective social media marketing strategies. Therefore, this study conducted multiple case studies by selecting five failure cases of social media marketing which we defined as paradigmatic social media marketing failures which happened in the last five years in South Korea. From the case studies, we derived five successful social media marketing strategies. This study has a theoretical implication because it is the first to suggest effective social media marketing strategies based on the analysis on social media marketing failure cases. It also has a practical implication since it proposes specific social media marketing strategies which can help facilitate successful social media marketing.

• 정보처리학회논문지:소프트웨어 및 데이터공학
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• 제9권11호
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• pp.357-366
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• 2020

항공기 탑재 소프트웨어의 비중 및 복잡성 증가에 따라, 소프트웨어 고장으로 인한 임무수행이나 기능 실패 및 성능 미달 등의 위험요인 또한 증가하고 있다. 항공기 탑재 소프트웨어처럼 미션 크리티컬 도메인의 대규모 소프트웨어에서 최소한의 기간과 비용으로 유지보수를 진행하기 위해서는 요구사항 추적관리가 필수적이다. 하지만, 개발업체에서는 개발비용이나 개발일정 등의 여러 사유로 인해 요구사항 추적관리 지침을 정확히 준수하지 못하고 있으며, 체계적으로 추적성 수립 활동을 수행하기란 쉽지 않다. 논문에서는 체계적인 추적성 수립 활동의 부재에 따른 요구사항 추적성 실패사례가 실제로 존재하는지 항공분야 소프트웨어의 실제 시험사례를 요구사항 추적성 관점에서 분석하고, 추적성 실패사례의 유형과 사안 경중에 따른 위험을 확인한다. 총 7개의 항공기 탑재 소프트웨어를 대상으로 분석을 진행한 결과, 실패사례는 총 3가지 유형인 요구사항 누락, 요구사항-시험절차 연계부족, 시험절차 누락으로 나눌 수 있었다. 실패사례는 총 18건으로 각 유형별 6건씩 있었으며, 각 사안에 따른 Risk는 High, Middle, Low 순으로 각각 1건, 13건, 4건으로 중간 수준의 위험이 가장 많았다.