Three-Arm Branch $90^{\circ}$ Hybrid Coupler를 이용한 평형증폭기 설계에 대한 연구

김선숙,서철헌,Kim, Seon-Sook,Seo, Chul-Hun 대한전자공학회 2006 電子工學會論文誌-TC (Telecommunications) Vol.43 No.2

본 논문에서는 중심주파수가 2GHz인 광대역 평형증폭기를 설계 및 제작 하였다. 본 논문에서는 $90^{\circ}$ Hybrid Branch-Line Coupler 와 Three-Arm Branch $90^{\circ}$ Hybrid Coupler의 특성을 비교하여, 광대역 특성을 나타내는 Three-Arm Branch $90^{\circ}$ Hybrid Coupler를 이용한 평형증폭기를 설계 및 제작하였으며, 제안된 증폭기는 대역폭이 480MHz이며, VSWR은 1.06 이하이고, 이득은 15.47dB의 특성을 보였다. In this paper, broadband balanced amplifier has been realized with Three-Arm Branch $90^{\circ}$ Hybrid Coupler at center frequency 2GHz. $90^{\circ}$ Hybrid Branch-Line Coupler has been compared with Three-Arm Branch $90^{\circ}$ Hybrid Coupler. The bandwidth VSWR and gain or proposed amplifier have been 480MHz, 1.06 and 15.47dB, respectively.

스커트 길이와 주가 지수 상관 이론인 헴라인 지수(Hemline index) 이론을 중심으로 한 패션 이론 검증 연구-1980~2013년을 중심으로-

김선숙 ( Seon Sook Kim ) 한국의류학회 2014 한국의류학회지 Vol.38 No.4

This study verified the ‘Hemline Index’ theory by George (1926) and established a new fashion theory frame to forecast future fashion cycles of skirts by analyzing the past fashion cycle of skirts through a dia-chronic method. Skirt pictures from 1980-2013 (the post-industrialized period of Korea) were analyzed and representative skirt styles, the fashion cycle of skirts and relation between skirt style, length, width and stock index were identified. A total of 1496 pictures in fashion magazine published over 34 years were selected and analyzed using PASW 18.0. The results were: For 34 years, representative skirts styles were mini skirt, midi skirt and long skirt. Fashion trend cycles of skirt length decreased for 10 years and the fashion cycle showed a trend to shorten. Skirt length & stock index related negatively and skirt length & skirt width rela-ted positively. All relations revealed significant results. Finally, the ‘Hemline Index’ theory of George (1926)was verified. Fashion marketers can develop successful and suitable products using a fashion cycle theory based on the results of this study.

소비 성향 척도 개발 및 소비성향 집단의 마케팅 커뮤니케이션 반응의 차이

김선숙 ( Seon Sook Kim ) 한국의류산업학회 2012 한국의류산업학회지 Vol.14 No.3

This study presents a marketing communication strategy from the aspect of new consumption orientation. Consumer preference on ads media, on-line ads media, and WOM usage were examined for new consumption orientation groups. This study was executed in a question survey format. A total of 182 questionnaires were obtained and data were analyzed by PASW 18.0 and AMOS 7. The results were as follows. First, 8 types of consumption orientation factors were revealed; ``impulsive purchase``, ``promotion oriented``, ``social contribution``, ``passive conformity``, ``innovative``, ``conspicuous``, ``rational``, and ``environmental conservation``, Then 4 groups were formed, ``Rational & Positive``, ``Conspicuous Conforming``, ``Positive Social Interested`` and ``Low Price Oriented``, Second, communication responses were analyzed through consumption orientation groups. The ``Rational & Positive`` group responded positively to every type of advertising media (especially new media). The ``Conspicuous Conforming`` and ``Positive Social Interested`` groups preferred traditional media such as TV, radio, and magazines; in addition, the ``Low Price Oriented`` group liked only online banner ads. For WOM preference, the ``Rational & Positive`` and ``Positive Social Interested`` group preferred verbal consumer information like WOM. In distribution types, the just ``Positive Social Interested`` group revealed a significant result for internet shopping malls. The results from this study will help establish marketing communication strategies based on the features of consumption orientation.

일 고급형 실버타운 거주 노인의 건강증진행위 실천 유형별 관련변인 탐색

김선숙(Kim, Seon-Sook),송준아(Song, Jun-Ah) 한국노년학회 2012 한국노년학 Vol.32 No.1

본 연구는 고급형 실버타운 거주 노인의 건강증진행위 실천 정도 및 유형을 파악하고, 그 유형에 따른 인구학적 특성과 관련 제 변인의 관계를 규명하며 각각의 유형에 영향을 미치는 변인을 탐색하고자 시행된 서술적 조사연구이다. 연구의 대상자는 서울시내에 소재한 일개 고급형 실버타운에 1개월 이상 거주한 만 60세 이상 노인으로서 연구참여 동의서에 서명하고 설문조사에 모두 응답한 170명이었다. 실버타운 거주 노인의 건강증진행위 실천 평균 점수는 3.05점(SD=.54)으로 나타났고, 군집분석 결과 소극적 건강증진행위 실천군(M=2.75점)과 적극적 건강증진행위 실천군(M=3.29점)의 2가지 유형으로 나타났다. 건강증진행위 실천 관련 제 변인 중 지각된 자기효능감, 지각된 유익성, 지각된 장애성, 우울, 주관적 건강상태는 유형에 따라 통계적으로 유의한 차이를 나타냈으나, 인구학적 특성 관련 변인은 통계적으로 유의한 차이가 없었다. 단계적 다중회귀분석 결과, 소극적 건강증진행위 실천군에서는 지각된 유익성(β=.50, R²=.25)이, 적극적 건강증진행위 실천군에서는 지각된 자기효능감(β=.38, R²=.30)과 지각된 장애성(β=-.20, R²=.30)이 노인의 건강증진행위 실천에 영향을 미치는 변인으로 나타났다. 본 연구결과를 바탕으로 볼 때 고급형 실버타운 거주 노인의 건강증진행위 실천을 증진하기 위해서는 우선 먼저 노인의 건강증진행위 실천 유형을 파악할 필요가 있으며, 파악된 유형에 가장 적합한 프로그램과 전략을 활용하는 것이 보다 효율적일 수 있을 것으로 사료된다. 특히, 건강증진행위 실천의 유익성을 적극적으로 홍보하고, 자기효능감을 증진시킬 수 있는 다양한 프로그램을 개발하는 방안이 도움이 될 수 있을 것이며, 따라서 추 후 이를 위한 구체적인 중재 프로그램 개발 연구가 필요함을 제언하는 바이다. The purpose of this study was to identify the types of health promotion behavior practice (HPBP) of retirement community residents in Korea and investigate the factors relative to their HPBP. The sample of this study consisted of 170 older adults in a retirement community located in the city of Seoul. Data was collected by a structured questionnaire that included demographic information, the Health Promotion Lifestyle Profile (HPLP), Self-Efficacy, the Perceived Benefit, the Perceived Barrier, Depression, and Subjective Health Status. For the analysis of data, Descriptive statistics, cluster analysis, Chi-square test, t-test, and Stepwise Multiple Regression were used for the statistical with the SPSS and the SAS program. The results were as following: 1)The mean score of the HPLP was 3.05(SD=.54). 2) HPBP was classified into two types based on the results of cluster analysis. Type I was named "passive HPBP group" (2.75±.29) and type II "active HPBP group"(3.29±.25). 3) Stepwise multiple regression analyses showed that only perceived benefit(β=.50, R²=25) was a significant factor predicting participants' HPBP of the passive HPBP group, while perceived self-efficacy(β=.38, R²=30) and perceived barrier (β=-.20, R²=30),were for the active HPBP group. The limitation, implication of this study and future tasks for the older adults were discussed.

패션 주기 이론 구성을 위한 팬츠 스타일 트렌드 분석-1967~2012년을 대상으로-

김선숙 ( Seon Sook Kim ) 한국의류학회 2013 한국의류학회지 Vol.37 No.6

This study establishes a fashion theory frame to forecast future fashion cycles of pants through analyzing past fashion cycles of pants through a diachronic method. Pants pictures from 1967-2012, post-industrialized period of Korea were analyzed. Representative pant styles, fashion cycles of pants and the relation of pant styles, length and width were identified. The total of 1006 pictures in fashion magazine published over 46 years were selected and analyzed using PASW 18.0 (statistical program). The results are as follows. For 46 years, representative pant styles were skinny, regular and bell-bottom. The first cycle period was from 1969 to 1992 and lasted 24 years. The second cycle period was from 1993 to 2003 and lasted 11 years. The third cycle is ongoing as of 2004. Fashion cycles have shown a general trend to be shortened. The relation between pant styles, length and width revealed related results; in addition, pant length and width changed significantly in a similar orientation. Fashion marketers can develop successful products using fashion cycle theory from these results.

인터넷 의류 상품 구매자의 유형화에 관한 탐색적 연구

김선숙(Seon-Sook Kim),이은영(Eun-Young Rhee) 한국유통학회 1999 流通硏究 Vol.4 No.2

라이프스타일 집단유형화에 따른 패션 광고매체 선호도

김선숙 ( Seon Sook Kim ) 대한가정학회 2011 Family and Environment Research Vol.49 No.8

This study aimed to present marketing communication strategy for lifestyle groups. Consumers` preference on advertisement media/information source, advertisement appeal types, and on-line media use were examined by lifestyle groups. This study was executed by web survey and off-line survey. A total of 141 data was obtained and data were analyzed by PASW 18.0. Results were as follows: First, 4 types of lifestyle groups were made up by holistic approach; ``price oriented``, ``traditional symbolic``, ``positive life``, and ``open mind enjoyment``. ``Positive life type`` preferred every type of ads media. ``Traditional symbolic type`` liked magazine and ``price oriented type`` and ``open mind enjoyment type`` thought off-line store display more important. For ads appeal types, ``positive life type`` preferred social oriented appeal type. Every group except ``price oriented type`` preferred emotional appeal type and especially ``open mind enjoyment type`` liked the most emotional ads appeal type.

보문 : 전통 문화 가치관 특성에 따른 전통 디자인의 선호 및 구매 의도, 전통 디자인의 선호 스타일 이미지

김선숙 ( Seon Sook Kim ),김지영 ( Ji Young Kim ),고은주 ( Eun Ju Ko ) 한국의류학회 2010 한국의류학회지 Vol.34 No.7

Single FET와 Class-F급을 이용한 이중대역 고효율 전력증폭기 설계

김선숙(Seon sook Kim),서철헌(Chulhun Seo) 대한전자공학회 2008 電子工學會論文誌-TC (Telecommunications) Vol.45 No.1

본 논문에서는 단일 FET를 이용하여 2.14㎓/5.2㎓ 이중대역 고효율 Class F 전력증폭기를 설계 구현하였다. 전송선로를 이용하여 초기의 정합값을 적절히 이동시켜 하나의 능동소자로 2.14㎓/5.2㎓의 이중대역에서 동작되는 전력증폭기를 설계하였으며, 2.14㎓에서 32.65㏈m의 출력과 11㏈의 출력이득 36%의 전력효율을, 5.2㎓에서 7㏈의 출력이득의 특성을 보였다. 고조파를 제어 회로를 설계하여 증폭기의 출력단에 추가 하여 Class F로 동작하는 이중대역 전력증폭기를 설계 하였다. 이중대역 Class F 전력증폭기는 2.14㎓에서 9.9㏈의 출력이득과 30㏈m의 출력, 55%의 전력효율을 가졌으며, 5.2㎓에서 11.7㏈의 출력이득을 갖는 특성을 보였다. 고조파 제어 회로를 이용한 이중대역 Class F 전력증폭기가 전력효율을 향상시킴을 보였다. In this paper, high efficient class F power amplifier with dual band has been realized. Dual band power amplifier have used modify stub matching for single FET, center frequency 2.14㎓ and 5.2㎓ respectively. Dual band amplifier is 32.65㏈m output power, gain 11㏈ and PAE 36% at the 2.14㎓, 7㏈ gain at the 5.2㎓. Design of a dual band class F power amplifier using harmonic control circuit. The measured are 9.9㏈ gain, 30㏈m output power and PAE 55% at the 2.14㎓, 11.7㏈ gain at the 5.2㎓. This paper is being used the load-pull method and it maximizes output power and it is using the only one transistor in the paper. As a result, this research will obtain a dual band high PAE power amplifier.

Single FET와 CRLH 전송선을 이용한 이중대역 고효율 전력증폭기 설계

김선숙(Seon sook Kim),서철현(Chulhun Seo) 대한전자공학회 2010 電子工學會論文誌-TC (Telecommunications) Vol.47 No.2

본 논문에서는 단일 FET와 composite right/left-handed (CRLH) 전송선을 이용하여 2.14㎓/5.2㎓ 이중대역 고효율 전력 증폭기를 설계 구현하였다. 전송선로를 이용하여 초기의 정합값을 적절히 이동시켜 하나의 능동소자로 2.14㎓/5.2㎓의 이중대역에서 동작되는 전력증폭기를 설계하였다. 이중 대역에서 모든 고조파 성분을 조절하는 것은 매우 어렵기 때문에, CRLH 전송 선로를 이용하여 이중 대역에서 고효율 특성을 얻도록 오직 2차, 3차 고조파 성분만을 조절하였다. 또한, 이중 대역에서의 출력특성이 균형을 이루도록 하였다. 전력증폭기의 측정된 출력 전력은 각각 2.14 ㎓에서 28.56 ㏈m, 5.2 ㎓에서 29 ㏈m이다. 이 지점에서 얻은 전력 효율, PAE는 2.14 ㎓에서 65.824 %, 5.2 ㎓에서 69.86 %이다. In this paper, high efficient power amplifier with dual band has been realized. Dual band power amplifier have used modify stub matching for single FET, center frequency 2.14㎓ and 5.2㎓ respectively. The dual-band operation of the CRLH TL is achieved by the frequency offset and the nonlinear phase slope of the CRLH TL for the matching network of the power amplifier. Because the control of the all harmonic components is very difficult in dual-band, we have managed only the second- and third-harmonics to obtain the high efficiency with the CRLH TL in dual-band. Dual-band characteristics in the output has to balance. Two operating frequencies are chosen at 2.14 ㎓ and 5.2 ㎓ in this work. The measured results show that the output power of 28.56 ㏈m and 29 ㏈m was obtained at 2.14 ㎓ and 5.2 ㎓, respectively. At this point, we have obtained the power-added efficiency (PAE) of 65.824 % and 69.86 % at two operation frequencies, respectively.