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박수강,최낙일,백형래,임양수,이기용,신사현 조선대학교 에너지.자원신기술연구소 1998 에너지·자원신기술연구소 논문지 Vol.20 No.1
A single phase induction motor(SPIM) with two windings, main and auxiliary, is probably the most widely used motor in the world due to their ruggedness, low maintenance and simplicity of construction There are several ways of starting single phase motors The most popular arrangements is centrifugal switch An auxiliary winding connected in series with a capacitor, is brought into the circuit during starting The closing and opening of the switch must be speed dependant The switch meets the speed requirements, but it also has many drawback random switching, arcing, many models necessary for different speeds and shaft diameters, space required inside the motors and limited lifetime to name some of them. In this paper, the starting current of single phase induction motor was detected by a small detector and determined TRIAC gate signal. The strategy of current control is based on limited main and auxiliary current angle during starting period in the closed-loop control. The experimental result show the motor's starting characteristics of the proposal starting system and are compared with centrifugal switch starting motor.
고객만족에 대한 은행서비스 품질속성의 비대칭적 영향력 분석
백인기 ( In Gie Baek ),전영호 ( Young Ho Chun ),이춘선 ( Chun Seon Lee ),최영락 ( Young Lak Choi ) 한국품질경영학회 2011 품질경영학회지 Vol.39 No.1
The paper presents the results of a study on the determinants of customer satisfaction for a retail bank using the data of 2009 NCSI(National Customer Satisfaction Index, KPC). In doing so, it uses a revised version of the traditional analyses based on derived measures of attribute importance. The need for a revised methodology is prompted by the insights of the two- and three-factor theories of customer satisfaction, such as Kano`s framework. Indeed, the evidence from 1635 customers of 6 Korean banks confirms an asymmetric relationship between attribute performances and overall customer satisfaction. The results from both a traditional and our revised approach are compared. While this approach can be applied across different industries, it should not be assumed that the numerical results presented in the paper apply to contexts with substantially different underlying characteristics. General trends and practical implications for banking services are reported in the conclusions.
Role of reactive thrombocytosis after primary cytoreductive surgery in advanced ovarian cancer
( Seung Hun Baek ),( Joseph J. Noh ),( Jung In Shim ),( Jun Hyeok Kang ),( Soo Young Jeong ),( Chel Hun Choi ),( Tae-joong Kim ),( Jeong-won Lee ),( Byoung-gie Kim ),( Duk-soo Bae ),( Yoo-young Lee ) 대한산부인과학회 2020 대한산부인과학회 학술대회 Vol.106 No.-
Objective: Surgery induced thrombocytosis occurs frequently in various disease. We investigated the incidence of reactive thrombocytosis after maximal cytoreductive surgery in epithelial ovarian cancer and its role on survival. Methods: An electronic chart review was performed of advanced epithelial ovarian cancer patients who had primary cytoreductive surgery from January 1, 2012, and December 31, 2017. Besides from known clinical prognostic factors, serum platelet counts at various time points including before surgery, during peri-operative period, and on each cycle of adjuvant chemotherapy were collected. Results: 474 patients were eligible for the analysis. Median age was 55 years (18 -88) and pretreatment CA 125 was 1519.2 U/mL (5.5-16719). 401 patients (84.6%) were FIGO Stage III and serous histology was most common (405 patients, 85.4%). 79 patients (22.6%) had splenectomy and optimal cytoreduction (residual < 1cm) was achieved at 326 patients (68.8%). Thrombocytosis was observed in 273 patients (57.6%) patients in the entire cohort. Especially, higher platelet counts were observed in patients with splenectomy compared without splenectomy (e.g. on post-operative day 12, p<0.001). Subgroup of patients who still had thrombocytosis during adjuvant chemotherapy showed poorer survivals than the others. In particular, thrombocytosis on 5th cycle of adjuvant chemotherapy showed most significant impact on overall survival (HR; 1.871, 95%CI; 1.034-3.386, p=0.038) among various time points in multivariate analysis. In a logistic regression model, splenectomy (p<0.001) and optimal cytoreduction (p=0.025) significantly attributed to thrombocytosis on 5th cycle. Conclusion: Our findings suggest that reactive thrombocytosis after primary cytoreductive surgery is associated with poor survival in advanced ovarian cancer, particularly when splenectomy was performed and thrombocytosis was observed during adjuvant chemotherapy. New approaches to increase oncological outcomes are needed for this subgroup of patients.
The Role of Postsplenectomy Reactive Thrombocytosis in Advanced Epithelial Ovarian Cancer
( Seung Hoon Baek ),( Jun Hyeok Kang ),( Soo Young Jeong ),( Myeong Seon Kim ),( E Sun Paik ),( Yoo-young Lee ),( Chel Hun Choi ),( Tae-joong Kim ),( Jeong-won Lee ),( Byoung-gie Kim ),( Duk-soo Bae ) 대한산부인과학회 2019 대한산부인과학회 학술대회 Vol.105 No.-
Objective: Thrombocytosis as part of paraneoplastic syndrome has been associated with poor ovarian cancer survivals. During maximal cytoreductive surgery in advanced ovarian cancer, about 30% of patients has splenectomy to achieve optimal cytoreduction. About 75% of individuals without myeloproliferative disorders develops thrombocytosis after splenectomy in general population. However, the incidence of thrombocytosis after splenectomy and its role on survival in advanced epithelial ovarian cancer is still unclear. Methods: This is a retrospective cohort study using data from Samsung Comprehensive Cancer Center, Seoul, Korea (January 1, 2012, and December 31, 2017). We identified patients who were diagnosed with advanced epithelial ovarian cancer and had splenectomy during primary debulking surgery. Results: Eighty nine patients were eligible for this study. Median age was 55 years (33-79) and pretreatment CA 125 was 870.3 U/mL (8.8-16719). 74.2% (66/89) and 25.8% (23/89) was FIGO stage IIIC and IV, respectively. 56% of patients showed thrombocytosis on postoperative day 7 after splenectomy. Preoperative platelet count was 307 K/μL (121-671) and postsplenecomty platelet count on day 7 was significantly increased at 502 K/μL with a range of 116-1029 K/μL (P < 0.001), which is 70% increase on average. When we divide the entire cohort into two groups (< 70% increase, group 1 vs. ≥ 70% increase, group 2), there is no difference in progression free survival (P = 0.584) and overall survival (P = 0.700). In multivariate analysis adjusting stage, level of residual disease, CA 125, and age, platelet counts changes after splenectomy did not affect the survival outcomes (PFS; HR 1.027 95%CI 0.637 - 1.656, OS; HR 1.328 95%CI 0.654 - 2.695). No difference in thromboembolic events was also observed between groups. Conclusion: As opposed to thrombocytosis related with paraneoplastic syndrome, postsplenectomy reactive thrombocytosis does not affect survival outcomes in advanced epithelial ovarian cancer.
홍인기 ( In Gie Hong ),백종배 ( Jong Bae Baek ) 한국안전학회(구 한국산업안전학회) 2016 한국안전학회지 Vol.31 No.2
The purpose of this study was to investigate the factors that influence safety rule violation at work. Semi-structured interviews were conducted with 337 participants from nine manufacturing plants. The results of the content analysis revealed the following six categories: Individual characteristics, safety commitment, safety support and resources, safety competence and communication, production pressure, and problems with rules. Among the 14 factors in the six categories above, indirect accident experience in the individual characteristics category and no action for complying with laws in the problems with rules category had not been identified in previous studies. However, some factors, such as age, peer pressure, pay type, the lowering of risk, a masculine way of working, and supervisor position were not found in this study. The implications and limitations are discussed.
신경망을 이용한 정성적 자료의 정량적 정보로의 변환에 관한 연구
전영호,백인기 弘益大學校 科學技術硏究所 1998 科學技術硏究論文集 Vol.9 No.2
제품의 개발은 설계단계에서부터 소비자의 요구를 철저히 반영하여 최종 제품이 소비자에게 인도될 때까지 발생할 수 있는 손실을 최소화할 수 있어야 하며, 이는 애매하고 추상적으로 표현되는 소비자의 제품에 대한 정성적 평가를 정량적 정보로 변환하는 과정중에 발생할 수 있는 문제점을 최소화함으로써 달성될 수 있다. 본 연구는 대상선정, 의미차별화척도를 이용한 설문, 제품평가자의 성향분석, 성향분석결과에 의한 신경망 훈련자료 구축을 통해 각 소비자의 제품에 대한 평가, 즉 정성적 자료를 정량적으로 변환함으로써 정성적 자료와 정량적 정보간의 차이를 극소화할 수 있는 방안을 수립하고자 한다.
홍인기 ( In Gie Hong ),백종배 ( Jong Bae Baek ) 한국안전학회(구 한국산업안전학회) 2016 한국안전학회지 Vol.31 No.1
The purpose of this study is to identify issues for an effective safety culture assessment by conducting a case study of an electronics manufacturing plant in Korea. Cooper’s safety culture model was used as the assessment method, and Fleming and Hudson’s safety culture maturity models were applied as assessment criteria. The results of the safety culture assessment showed that there needs to be a design optimized for study purposes. For example, the correlation between the questionnaire survey and in-depth interview needs to be analyzed. The result of the behavior monitoring should show the relationships with other dimensions. A safety culture maturity model has to be developed to customize the study factors and questions.