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Doherty증폭기를 이용한 Feedforward전력 증폭기의 효율 개선에 관한 연구
이택호,정성찬,박천석,Lee Taek-Ho,Jung Sung-Chan,Park Cheon-Seok 한국전자파학회 2005 한국전자파학회논문지 Vol.16 No.11
본 논문은 피드포워드 전력 증폭기의 효율 개선을 위한 도허티 증폭기의 적용에 관한 연구이다. 성능 분석을 위하여 중심 주파수 2.14 GHz의 WCDMA 4FA신호를 인가하여 평균 출력 전력 15 W에서 측정하였다. 적용한 도허티 증폭기는 동급 class AB 증폭기와 비교하여 고효율 저선형성의 특성을 나타내며 효율 개선을 위하여 피드포워드 전력 증폭기(FPA)의 주 증폭기로 사용되었다. 특성 변화를 분석하기 위해 선형성과 효율 특성이 다른 2가지 종류의 도허티 증폭기를 적용하였으며 각각의 FPA들은 평균 출력 15 W에서 효율은 $2\%$ 이상의 개선을 보였지만 선형성은 1.5 dBc 이상 저하되는 특성을 나타냈다. 저하된 선형성을 개선하기 위하여 부가적으로 오차 루프의 결합 계수(CF)와 오차 증폭기의 용량을 변화시켰다. CF와 오차 증폭기의 용량 변화로 효율 개선과 높은 선형성을 얻을 수 있었고 도허티 증폭기가 35 dBc 이상의 선형성을 유지하면 부가적인 변화 없이 평균 출력 전력 15 W에서 $2\%$ 이상의 효율 개선과 충분한 선형성을 얻을 수 있다. This paper reports an application of Doherty amplifier for efficiency improvement of feedforward power amplifier(FPA). For performance analysis, we measured 15 W average output power using WCDMA 4FA input signal with a center frequency 2.14 GHz. The applied Doherty amplifier presents the characteristics of high efficiency and low linearity in comparison to the class AB amplifier, and it was used as main amplifier of FPA fir efficiency improvement. To analyze the change of characteristic, tow Doherty amplifiers whose linearity and efficiency are different were applied. The applied FPAs are improved about $2\%$ or more performance in efficiency, but decreased in linearity on 15 W average output power. We additionally modified the coupling factor(CF) of the error loop and the error amplifier capacity for linearity improvement. Aa a result, the efficiency improvement and high linearity resulted from the change of CF and error amplifier capacity. However, we think if the linearity of Doherty amplifier were more than 35 dBc, the FPA would improve the performance about $2\%$ or more efficiency and maintain enough linearity.
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학교 밖 청소년의 사회적 낙인이 게임중독에 미치는 영향에 대한 자아존중감의 종단적 매개효과 검증 : 자기회귀교차지연 모형의 적용
이택호 ( Lee Taekho ),이재윤 ( Lee Jaeyoon ) 한국청소년학회 2023 청소년학연구 Vol.30 No.2
본 연구는 학교 밖 청소년들의 사회적 낙인이 게임중독에 미치는 영향에 대한 자아존중감의 종단적 매개효과를 살펴봄으로써 게임중독을 예방할 수 있는 효과적인 개입방안을 모색하고자 하였다. 이를 위하여 학업중단 청소년 패널 조사 2-4차년도 총 3개년도 데이터를 활용하였고, 모든 변수에서 결측치가 없는 381명의 청소년을 대상으로 분석을 실시하였다. 사회적 낙인과 자아존중감, 게임중독 간의 종단적 매개효과를 검증하기 위하여 자기회귀교차지연 분석을 실시하였으며, 연구결과는 다음과 같다. 첫째, 학교 밖 청소년의 사회적 낙인은 자아존중감에 종단적으로 부적인 영향력을 나타냈다. 둘째, 학교 밖 청소년의 자아존중감은 게임중독에 종단적으로 부적인 영향을 나타냈다. 셋째, 종단적 관점에서 학교 밖 청소년의 사회적 낙인이 게임중독에 미치는 영향을 자아존중감이 완전매개하였다. 이와 같은 결과를 바탕으로 학교 밖 청소년의 게임중독을 예방할 수 있는 개입방안을 논의하였다. This study aimed to examine the longitudinal relationship between social stigma and game addiction of out-of-school adolescents and the mediating effect of self-esteem. Three waves of nationally representative data collected from out-of-school adolescents (N= 381, male 56.43%) with a year interval were used. A longitudinal autoregressive cross-lagged analysis was conducted to explore the relationship between social stigma, game addiction, and the self-esteem in Korean adolescents. The results of the study are as follows. First, social stigma had a longitudinal negative influence on self-esteem. Second, self-esteem had a longitudinal negative effect on game addiction. Third, self-esteem completely mediated the effect of the social stigma on game addiction. Through the results of this study, some intervention methods were proposed to prevent out-of-school adolescents from remaining as a group vulnerable to game addiction.
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메탈메쉬 터치스크린 제품의 품질보증시스템 인증을 위한 중소기업 대응방안 연구
이택호 ( Taek-ho Lee ),홍성훈 ( Sung-hoon Hong ),권혁무 ( Hyuck-moo Kwon ),이민구 ( Min-koo Lee ) 대한설비관리학회 2016 대한설비관리학회지 Vol.21 No.3
The purpose of this study is to investigate and systemize the evaluation items and criteria in terms of the product development, the quality, the reliability and the process management of global set makers in order to assure the quality and reliability of the Metal Mesh Touch Screen that PET(polyethylene terephthalate) films are applied. This study also suggests the countermeasures for small and medium enterprises to obtain the certification of the quality assurance system by identifying the quality evaluation items from the stage of product development of global set makers to their production. H company of the U.S, F company of Japan, and S company of South Korea are chosen as representatives.
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Prediction of diabetes occurrence using variable selection and classification methods
Taek-Ho Lee(이택호),Chi-Hyuck Jun(전치혁) 대한산업공학회 2016 대한산업공학회 춘계학술대회논문집 Vol.2016 No.4
Diabetes is one of the major chronic diseases. The death rate from diabetes is more and more increasing, so causing the financial burdens of the nation to increase. Because chronic diseases, if occur, require continuous management and they are hard to be completely cured, it is important to predict its occurrence in advance. Our goal is to make diabetes risk prediction model based on machine learning techniques using database established by Korean National Health Insurance Corporation. The procedure to build the prediction model consists of two phases, i.e., ‘variable selection’ to find significant factors of diabetes and ‘learning classifier’ to learn a statistical risk prediction model. For the former, we apply correlationbased feature selection, minimum redundancy maximum relevance, classification and regression tree (CART) variable importance, and support vector machine (SVM)-recursive feature elimination. On the other hand, we apply logistic regression, linear discriminant analysis, CART, naïve Bayes (NB), and SVM for the latter. For the purpose of comparison, we conducted numerical experiments for the combinations of each variable selection method and classifier. As a result, the variable selection methods give somewhat consistent results. In the result of performance comparison, no significant difference has been observed among 5 classifiers except NB which showed poor performance.
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Prediction of diabetes occurrence using variable selection and classification methods
Taek-Ho Lee(이택호),Chi-Hyuck Jun(전치혁) 한국경영과학회 2016 한국경영과학회 학술대회논문집 Vol.2016 No.4
Diabetes is one of the major chronic diseases. The death rate from diabetes is more and more increasing, so causing the financial burdens of the nation to increase. Because chronic diseases, if occur, require continuous management and they are hard to be completely cured, it is important to predict its occurrence in advance. Our goal is to make diabetes risk prediction model based on machine learning techniques using database established by Korean National Health Insurance Corporation. The procedure to build the prediction model consists of two phases, i.e., ‘variable selection’ to find significant factors of diabetes and ‘learning classifier’ to learn a statistical risk prediction model. For the former, we apply correlationbased feature selection, minimum redundancy maximum relevance, classification and regression tree (CART) variable importance, and support vector machine (SVM)-recursive feature elimination. On the other hand, we apply logistic regression, linear discriminant analysis, CART, naïve Bayes (NB), and SVM for the latter. For the purpose of comparison, we conducted numerical experiments for the combinations of each variable selection method and classifier. As a result, the variable selection methods give somewhat consistent results. In the result of performance comparison, no significant difference has been observed among 5 classifiers except NB which showed poor performance.
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이석영(Seok Young Lee),이택호(Taek Ho Lee),한윤선(Yoon Sun Han) 한국아동복지학회 2015 한국아동복지학 Vol.- No.50
선행연구에서는 폭력비행 피해를 받은 청소년이 가해자로 변할 수 있음을 시사한다. 그러나 오프라인 상의 청소년 피해경험이 사이버 비행에 영향을 주는지, 그리고 어떠한 경로로 영향을 주는지에 대해 구체적으로 밝혀진바가 없다. 따라서, 본 연구는 청소년의 폭력비행 피해가 사이버 비행 가해에 영향을 미치는지, 영향을 미친다면 그 경로에 공격성, 우울, 사회적 위축이 매개효과를 나타내는지 살펴보았다. 본 연구를 위해 한국청소년정책연구원(NYPI)에서 실시하는 한국아동·청소년 패널조사(KCYPS)의 중학교 1학년패널 2차년도(2011) 데이터(N =2,054)를 활용하였으며, 경로분석과 Sobel 검정등을 통해 통계분석을 실시하였다. 연구결과는 다음과 같다. 첫째, 학교 폭력비행 피해는 청소년의 사이버 비행 가해 행동에 영향을 준다. 둘째, 학교폭력 피해 경험이 사이버 비행에 미치는 영향에 있어 사회적 위축을 제외한 공격성, 우울이 모두 부분 매개하는 것으로 나타났다. 오프라인에서의 피해가 온라인상에서 가해로 이어질 가능성은 접근의 용이성과 익명성이라는 온라인 공간의 특성으로 설명할 수 있을 것이다. 그리고 본 연구의 결론에서 폭력비행 피해가 사이버 비행으로 이행되는 경로를 밝히고, 사이버 비행을 예방하기 위한 방안을 제안하였다. Literature suggests that youth victims of violence may subsequently develop into offenders. However, the exact mechanisms through which the victimization of youth offline affects their engaging in delinquent behavior online are relatively unknown. Thus, this study examined the relationship between violence victimization and cyber delinquency, investigated the mediating role of aggression, depression, and social withdrawal in this relationship. Data were obtained from the second wave of the middle school student cohort (N =2,054) of the Korean Children-Youth Panel Survey (KCYPS). Main analyses involved simple regression analysis, multivariate regression using path analysis and the Sobel test. The major findings are as follows: First, violence victimization was found to have a positive association with cyber delinquency. Second, the relationship between violence victimization and cyber delinquency was partially mediated by aggression and depression, but not by social withdrawal. The significant link between offline victimization and online perpetration may be explained by the unique features of online space that is easily accessible to anyone and preserves anonymity of the offender. The findings from this study highlight the importance of providing interventions for youth who are victims of violence and have symtoms of aggression and depression to prevent further cyber delinquency.
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하규수,이택호,이승원,김기학,Ha, Kyu-Soo,Rhee, Taik-Ho,Lee, Seung-Weon,Kim, Ki-Hak 한국벤처창업학회 2006 벤처창업연구 Vol.1 No.1
This paper introduced successful case studies of the EIP (Entrepreneurship Intensive Programs) programs that are planed by 5MBA (Small and Medium Business Administration) and executed by Hoseo University and Jinju National University in 2004. Therefore, the illustrations and examples used in this paper are based on the EIP programs of those schools. Currently there are five graduate schools for Entrepreneurship educations that are originated from the EIP program models and those graduateschools are actively and successfully working. The purpose of this paper is to find out the diffusing strategies of the Entrepreneurship spirits and Entrepreneurship Education programs after careful analysis and review of the EIP programs. The main factors of the Success of the EIP are as follows. First, there were excellent modules of the education process. Second, there were firm and clear goals of the education. Three, there were differentiated contents of the entrepreneurship education programs. Four. each and every education performance was monitored. Five, during the programs, real start-up cases were actually handled and students had many opportunities to present their cases. However, there were some shortcomings to improve and change of the entrepreneurship education. First of all, it was very difficult to make proper education formation that is fit in the purpose of the program. Second, motivating students to find out their own business opportunities so as to turn them into real business was not satisfactory or easy. Third, there were some limitations in distributing and executing the EIP budgets. Therefore, to improve the efficiency of the Entrepreneurship education, following expanding strategies should be complemented. First, continuous redesigning of the entrepreneurship education programs is very important. Second, the specialization of the contents of the entrepreneurship education programs is essential. Third, there should be some discretionary room for the management of the entrepreneurship programs. Fourth, it is also important activating the entrepreneurship networks among schools of the entrepreneurship education. Finally, it is necessary to give some incentives and motivations based on the proper performance evaluation system.
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