EER 및 PBG를 이용한 전력 증폭기의 효율 및 선형성 개선에 관한 연구

이종민,서철헌,Lee, Chong-Min,Seo, Chul-Hun 한국전자파학회 2007 한국전자파학회논문지 Vol.18 No.6

본 논문에서는 EER(Envelope Elimination and Restoration) 구조를 응용하여 전력 증폭기의 효율을 극대화 하였으며, EER구조의 취약점인 선형성을 PBG 구조를 이용하여 개선하였다. 고효율을 얻기 위해 class-F급 전력 증폭기를 설계하였으며 포락선 검파기를 이용하여 전력 증폭기의 구동 전력을 조절하였다. 또한, 정합 회로의 비정합에 의한 고조파 성분들을 PBG 구조를 이용하여 제거함으로써 높은 선형성을 얻었다. 본 논문에서 제안한 EER 구조를 응용한 전력 증폭기 구조는 적응형 바이어스를 이용한 Doherty 전력 증폭기에 비해 PAE(Power Added Efficiency)가 34.64% 개선되었고, 일반적인 Doherty 증폭기에 비해 3차 IMD가 6.65 dB 이상 개선되었다. In this paper, the efficiency of power amplifier has been maximized by the application of EER structure, and the linearity has been improved by using PBG structure. This paper has proposed a design of power amplifier in class-F to get the PAE, and to control dynamic power using envelope detector. PBG structure gets high-linearity by removing harmonics arisen from the mismatching of matching circuit. The PAE and the 3rd order IMD have been improved 34.64%, 6.65 dB compared with those of conventional Doherty amplifier, respectively.

블레이크의 『순수와 경험의 노래』 연구

이종민 ( Lee Chong-min ) 대한영어영문학회 2003 영어영문학연구 Vol.29 No.1

The aim of this essay is to investigate multi-dimensional meaning of some poems in William Blake's Songs of Innocence & of Experience. The primary background of this kind of investigation is what is called ‘Doctrine of the States,’ which becomes more concrete in Blake's later epics. States are stages of error, which the Divine Mercy creates so that the State, not the Individual in it, shall be blamed, and the Individual can be forgiven. Each speaker of each song is not alway Blake the poet. Blake is a kind of stage director who manages the speaker behind the scene. He does not directly represent the states of Innocence or of Experience, but tries to show “the Contrary States of Human Souls.” To understand this deliberate strategy of the prophet-poet and the various ironical and symbolic meanings behind it, the reader should cultivate his own imagination and intuition. Only then he can escape from the Newtonian vision which Blake does his best to avoid. < Chonbuk National University >

미국 방송압력단체들의 행태 연구

이종민(Chong min Lee) 한국방송학회 2000 한국방송학보 Vol.14 No.3

Critical mass theory as a central theme of collective action theory is applied to the process by which groups and individuals attempt to influence the content of network television programs. Analysis of the makeup and actions of pressure groups identifies two distinct production functions which are each related to a specific type of pressure group. The actions(i.e., institutionalized and informal strategy) of groups representing homogeneous subpopulations may be described as a decelerating production function, in which those taking initial action have the strongest effect, with subsequent contributions reflecting disproportionately smaller payoffs. On the other hand, the actions(i.e., boycott strategy) of groups reflecting broader concerns are described as an accelerating production function in which the initial actions of the group lead to progressively larger payoffs. In either case, the key to influencing program content is the achievement of a "critical mass" of interest and resources from individuals.

Message Framing Effects Revisited

Lee, Chong-min(이종민) 한국광고홍보학회 2008 광고연구 Vol.0 No.78

부당표시광고의 유형화 연구

이종민(Chong Min Lee),김지선(Ji Sun Kim) 한국광고홍보학회 2002 한국광고홍보학보 Vol.4 No.2

스크린 광고에 대한 침입성 수준이 기억과 태도에 미치는 영향 : 에티켓 광고와 일반 스크린 광고 간의 비교

이종민(Chong-Min Lee),한광석(Kwang-Seek Han) 한국옥외광고학회 2009 OOH광고학연구 Vol.6 No.4

본 연구의 목적은 극장광고의 대표적인 유형인 스크린 광고의 효과를 실증적으로 분석하기 위한 것이다. 국내 스크린 광고의 대표적인 유형은 일반 스크린 광고(30초)와 에티켓 광고(30초)로 분류된다. 이러한 스크린 광고는 타 매체에 비해 기억 효과와 광고 효과가 상대적으로 높은 것으로 알려져 있으나 상당한 비용을 지불하고 영화를 즐기려고 극장을 방문한 관객들은 영화 상영 이전의 광고 노출 자체가 침입적이라고 느껴 불편함을 유발한다. 이에 본 연구는 스크린 광고의 침입성 수준(고침입/ 저침입)과 광고 유형(일반 스크린광고/ 에티켓 광고)에 따라 광고 기억과 광고태도, 브랜드 태도, 구매의도에 어떠한 차이가 발생하는지를 실험을 통해 검증하였다. 연구결과, 침입성 수준에 따른 기억 효과에 대한 차이는 존재하지 않았으나 고침입 조건에서 일반 스크린 광고보다 에티켓 광고의 기억 효과가 높은 것으로 나타났다. 또한 광고태도, 브랜드 태도, 구매의도에 있어서는 고침입 조건보다 저침입 조건에서 태도와 구매 의도가 긍정적으로 나타났으며 모두 일관되게 일반 스크린 광고보다는 에티켓 광고의 효과가 긍정적이었다. The objective of this study is to analyze substantially the effects of Screen Advertising which is a representative type of advertising at movie theater. The representative type of Screen Advertising in Korea is categorized into Screen Advertising in general(30 seconds) and Etiquette Advertising (30 seconds), This Screen Advertising is known to be relatively higher in memory effects and advertising effects as compared to other media, but causes discomforts from the audiences who pay considerable costs to visit the theater to enjoy a movie but feel the advertising exposure itself before playing a movie to be intrusive. Thus this study has verified through experiments what differences are produced in Advertising Memory, Attitude toward advertising, Attitude toward brand, and Purchase Intention according to the level of intrusiveness of Screen Advertising (high intrusiveness / low intrusiveness) and the types of advertising(Screen Advertising in general/Etiquette Advertising). The study has resultantly shown higher effects of memory on Screen Advertising under the conditions of high intrusiveness than the conditions of low intrusiveness in case of Memory Effects, but no difference between Screen Advertising in general and Etiquette Advertising under the conditions of high intrusiveness. However, it has shown positive attitude and purchase intention under the conditions of low intrusiveness than the conditions of high intrusiveness over Attitude toward advertising, Attitude toward brand, and Purchase Intention; and consistently positive effects in Etiquette Advertising than Screen Advertising in general over the whole.

수화사용 청각장애인의 작업기억특성

이종민(Chong Min Lee),김영욱(Young Wook Kim) 한국언어청각임상학회 2003 Communication Sciences and Disorders Vol.8 No.3

The purpose of this study is to investigate how different the results are of the memory method of sign language in phonologically similar tasks of articulatory suppression task and digit span task among the three groups of the deaf, the deaf oral, and hearing(sign language interpreters) through immediate serial recall test. To investigate how those in each group use sign language based on code, I divided them into deaf, deaf oral, hearing adults and measured phonological similarity effects, articulatory suppression effects, digit span effects using lists of Korean sign language stimuli. The results were as follows. As for the phonological similarity effect, there were significant differences between the deaf adults, the oral deaf adults, and the hearing interpreters. All three groups were worse in recalling the phonologically similar lists than the dissimilar lists. As for the articulatory suppression effect, there were also significant differences between the three groups. The oral deaf group and the normally hearing group did better in recalling the lists in the suppressed condition than in the unsuppressed condition. However, the deaf group did worse in recalling in the suppressed condition than in the un suppressed condition. The span of working memory was measured first in the forward recall condition and then in the backward recall condition. There were also significant differences between the three groups in the digit recall. We can conclude that the deaf subjects who participated in this study differ from both the oral deaf and the hearing subjects in the way they remember signs. Furthermore, it shows that the deaf signers would form a visual-linguistic code for the signs while the hearing and the oral deaf subjects would undergo visual-pictorial processes. 이 연구에서는 수화를 능숙하게 사용하는 수화사용 청각장애인, 구화사용 청각장애인, 건청인을 대상으로 음운유사과제, 조음억제과제, 숫자폭과제의 즉시계열회상검사를 통해 작업기억에서 수화 단서를 부호로 회상하는 특징들의 차이를 밝히는 데 있다. 이를 위해 수화에 능숙한 수화사용 청각장애인, 구화사용 청각장애인, 건청인 집단으로 나누어 수화단어 자극을 사용하여 음운유사성효과와 조음억제효과를 측정하고, 작업기억용량을 측정하기 위해 숫자폭과제를 실시하였다. 그 결과 수화사용 청각장애인, 구화사용 청각장애인, 건청인 집단 모두 음운이 유사하지 않은 수화항목과 비교하여 음운이 유사한 수화항목에서 회상수행이 저하되었다. 조음억제효과에서는 구화사용 청각장애인, 건청인 집단 모두 손으로 조음을 통제한 결과 조음을 억제하지 않았을 때보다 조음을 억제하였을 때 수화항목의 회상수행이 증가하였다. 그러나 농인 집단의 경우 조음을 억제하지 않았을 때보다 조음을 억제하였을 때 오히려 수화항목의 회상수행이 저하되었다. 숫자폭과제에서는 상대적으로 건청인, 구화사용 청각장애인 집단은 작업기억용량이 높게 나타났으며, 수화사용 청각장애인은 상대적으로 작업기억용량이 낮은 것으로 나타났다. 이러한 결과들은 본 연구에 참여한 수화사용 청각장애인들은 수화를 시각적-언어적(visual-linguistic)처리과정으로 부호화하지만, 건청인과 구화사용 청각장애인은 수화를 시각적-그림(visual- pictorial)처리과정의 일반적인 형식으로 부호한다고 할 수 있다. 즉, 작업기억에서 수화를 기억하는 방법이 다른 것으로 나타났다.

문제 해결에 기반한 발음수업의 개선에 관한 연구

이종민 ( Chong Min Lee ) 전북대학교 인문학연구소 2014 건지인문학 Vol.12 No.-

This paper aims at raising up the new perspective on the teaching of English pronunciation. Since the communicative approach has been emphasized in Korea, the issue of how to improve the pronunciation skills has been neglected without any special intention. When the performance test is scheduled to be implemented, the problematization of pronunciation has been brought up in the middle school classrooms. The Korean teachers of English should understand the articulatory operations of vocal organs and be aware that the student learners have needed as many chances as shown in the immersion classes. Even the high school English teachers should not neglect the oral reading with accuracy, because the students have been good listeners. It has also been statistically illustrated that the meaning-centered communicative approach has given some negative effects on the form-focused techniques in the pronunciation instruction.

부당광고의 효과적인 심결을 위한 방법론 연구

이종민(Lee, Chong-Min),이종연(Lee, Jong-Yeon) 한국광고홍보학회 2003 광고연구 Vol.0 No.58

엘리어트의 INFERNO : THE FOUR QUARTETS를 통해 본 THE WASTE LAND

이종민(Chong Min Lee) 전북대학교 인문학연구소 1989 인문논총 Vol.19 No.-