대기시간을 이용한 적응형 멀티미디어 동기화 기법

이기성,이근왕,이종찬,오해석,Lee, Gi-Seong,Lee, Geun-Wang,Lee, Jong-Chan,O, Hae-Seok 한국정보처리학회 2000 정보처리학회논문지 Vol.7 No.2

Real-time application programs have constraints which need to be met between media-data. These constraints represents the delay time ad quality of service between media-data to be presented. In order to efficiently describe the delay time and quality of service, a new synchronization mechanism is needed. Proposed paper is a dynamic synchronization that minimized the effects of adaptive transmission delay time. That is, the method meets the requirements of synchronization between media-dat by handling dynamically the adaptive waiting time resulted from variations of delay time. In addition, the mechanism has interval adjustment using maximum delay jitter time. This paper decreases the data loss resulted from variation of delay time and from loss time of media-data by means of applying delay jitter in order to deal with synchronization interval adjustment. Plus, the mechanism adaptively manages the waiting time of smoothing buffer, which leads to minimize the gap from the variation of delay time. The proposed paper is suitable to the system which requires the guarantee of high quality of service and mechanism improves quality of services such as decrease of loss rate, increase of playout rate.

출판학 연구 동향 및 특성에 관한 논문 - 한국출판학연구(1982~2006)를 중심으로 : 출판학 연구 동향 및 특성에 관한 논문

이기성(Lee Ki-Sung) 한국출판학회 2006 한국출판학연구 Vol.0 No.51

‘출판학 연구 동향 및 특성에 관한 논문―한국출판학연구(1982~2006)를 중심으로’ 연구 논문은 1982년도부터 2006년 6월 통권 제50호까지 한국출판학연구에 실린 272건의 논문을 분석한 것이다. 본 논문은 서론, 선행 연구 검토, 최종 매체별 구분, 출판 분야 및 단계별 구분, 언어 문자별 구분, 필자별 논문 구분, 결론의 7개 내용으로 구성되었다. 출판에 관한 분류 방법에 대하여는 민병덕 교수, 이기성 교수, 남석순 교수, 이종국 교수, 팽건염 교수, 기륜성남 교수 등 여러 학자가 이미 연구한 바 있다. 필자는 매체별 분류, 분야별 분류, 단계별 분류, 언어 문자별 분류의 4가지를 하나의 같은 범주 내에서 구분하는 것이 아니라 각기 다른 위치(차원)에서 구분하는 것이므로 논문이나 출판물은 하나이지만, 이것을 각기 4가지씩으로 분류하는 방법을 2000년도에 제안한 바 있다. 첫 번째 : 최종 매체(media)에 의한 논문 구분(① 종이 매체, ② 전자 매체(비종이 매체), ③ 공용의 3가지), 두 번째 : 분야(field)에 의한 논문 구분(① 교과서류, ② 단행본류, ③ 잡지류, ④ 신문류, ⑤ 일반), 세 번째 : 단계(step)에 의한 논문 구분(① 기획, ② 편집, ③ 제작, ④ 마케팅, ⑤ 총괄), 네 번째 : 언어(language) 문자에 의한 논문 구분(① 한국어, ② 영어, ③ 중국어, ④ 일본어, ⑤ 기타 문자) 결론적으로 첫째, 출판학이나 출판 산업을 분석하려면 2차원 이상으로 분류하는 방법(멀티차원분석법)이 필요하다. 둘째, 제작 단계와 편집 단계의 논문이 매우 필요하다. 셋째, 출판 관련 논문을 작성하는 필자가 절대적으로 부족하다. This study is divided into 7 parts ; Introduction, Classification systems, Classification -based on output media, Classification -based on publication fields and steps, Classification -based on language and letters, Classification -based on authors, and Conclusion. Theses given in the collection of learned papers of Studies of Korean Publishing Science have been issued from 1982 to 2006 are two hundred and seventy two. Many scholars have suggested the way of analyzing the publications and publishing industry. Professor B.D. Min’s method : General remark, Selection, Production, Distribution, Managing, and History. Professor K.S. Lee’s method : Divided with final output Media, Divide with publication Field(contnents), Divided with publication production Step, and Divided with typeset Language and letters. Professor S.S. Nam’s method : Theory of publishing, Education, Production, Circulation, Reception, Environment, Industry, Electronic Publishing, Law, and International Publishing. Professor J.G. Lee’s method : Theory, Copyright/Morals, Editing/Production, Textbook, Book, Magazine, Electronic Publishing, Management/Industry, Circumstances, International Publishing, and Reading/Reader. In this study, I propose the analyzing publications and publishing industry is not only one dimension but also more than two dimensions according to the angles of vision. The first dimension is divided into 3 sections based on output media, such as Paper, Electron(non-paper), and altogether. The second dimension is divided into 5 sections based on publishing field, such as Textbook, Book, Magazine, Newspaper, and General(the others). The third dimension is divided into 5 sections based on production step, such as Planning, Editing, Production, Marketing, and General(basis). The fourth dimension is also divided into 5 sections based on language and letters, such as Korean character, English, Chinese, Japanese, and the others. Multi Dimension Analysis(MDA) which is using more than two dimensions is the most suitable way of analyzing the publications and the theses related to publishing.

연구개발과 국내외 특허 활용

이기성,Lee, Gi-Seong 한국전자정보통신산업진흥회 1985 電子振興 Vol.5 No.7

전자출판과 컴퓨터

이기성,Lee, Gi-Seong 대한출판문화협회 1988 출판저널 Vol.16 No.-

이방성 손상모델을 이용한 콘크리트 구성방정식의 도출

이기성,변근주,Lee, Ki Seong,Byun, Keun Joo 대한토목학회 1994 대한토목학회논문집 Vol.14 No.4

콘크리트는 초기부터 미세균열을 포함하고 있으며 이들의 성장과 전파에 의해 파손이 발생한다. 이와같은 과정을 손상이라 한다. 연속체 손상역학의 개념을 소개하고 열역학 법칙으로부터 자유에너지함수와 소산포텐셜을 가정하여 이차텐서로 나타낸 손상모델의 전개법칙과 구성방정식을 제안하였다. 구성방정식은 탄성과 손상 및 소성을 고려하도록 하였다. 도출된 모델을 이용하여 단조하중에 의한 일축과 이축응력을 받는 콘크리트에 적용하여 그 타당성을 검정하였다. Concrete contains numerous microcracks initially. The growth and propagation of microcracks cause failure of concrete. These processings are termed as "damage". The concepts of the continuum damage mechanics are presented and the damage evolution law and constitutive equation are derived by using the Helmholz free energy and the dissipation potential by means of the thermodynamic principles. The constitutive equation includes the effects of elasticity, damage and plasticity of concrete. The proposed model successfully predicts the nonlinear behavior of concrete subject to monotonic uniaxial and biaxial loadings.

질화규소-질화붕소 복합재료의 준소성 특성

이기성,이승건,김도경,Lee, Gi-Seong,Lee, Seung-Geon,Kim-kim, Do-Gyeong 한국재료학회 1998 한국재료학회지 Vol.8 No.3

질화규소-질화붕소 복합재료의 접촉하중에 의한 손상거동을 질화붕소 첨가량의 함수로 고찰하였다. Indentation응력-변형율 곡선은 선형성을 벗어나 소성 특성을 갖는 재료임이 밝혀졌으며, 재료 표면으로 부터의 ring이나 cone형상의 균열 대신 표면하부에 전단응력에 의한 마이크로 크기의 준소성 변형 영역이 넓게 형성되어 손상저항성이 높은 재료로의 활용이 기대되었다. 이 때 마이크로 파괴와 연관된 shear faults가 이 재료의 소성을 갖도록 하는데 중요한 역할을 하였다. 질화붕소의 첨가량이 증가함에 따라 질화규소-질화붕소 재료는 보다 soft해지고 준소성의 특성을 나타내었다. The nature, degree, and evolution of contact damage from Hertzian contacts in silicon nitride-boron nitride composites($Si_3N_4-BN$) are investigated as a function of boron nitride content. The strong deviations of indentation stress-strain from elastic response indicate exceptional plasticity in $Si_3N_4-BN$. The absence of ring cracks or cone cracks on the surfaces is observed, indicating a high damage tolerance. Subsurface quasi- plastic deformation by shear stress is considerable and microdamage is widely distributed within the region below the contact. Shear faults associated with local microfailures play a precursor role in plasticity of this material. When boron nitride content increases, $Si_3N_4-BN$ becomes softer and more quasi-plastic.

Pseudomonas sp. strain #A1에서 C-P 화합물 분해 유전자의 Cloning

이기성,조홍범,김수기,Lee, Ki-Sung,Cho, Hong-Bum,Kim, Soo-Ki 배재대학교 자연과학연구소 1999 自然科學論文集 Vol.11 No.1

C-P 화합물(Pn; phosphonate)의 일종인 glyphosate(GPS)를 인산원으로 이용하는 Pseudomonas sp. strain #A1으로부터 GPS 분해 유전자 및 2-aminoethylphosphonate(AEPn), methyl-phosphonate(MPn)와 같은 Pn의 분해 유전자를 클로닝하였다. Mini-Mu plasmid를 이용한 in vivo molecular cloning 결과 약 10-19 Kb의 $AEPn^+$ clones, 10 Kb의 $MPn^+$ clones, 12-18 Kb의 $GPS^+$ clone들을 얻었으며 E. coli의 $\Delta phn$ mutants에 transformation 하였을 때 각각의 Pn에 대한 다양한 phenotype을 나타냈다. 따라서 Pseudomonas sp. strain #A1에서는 적어도 3종류의 Pn 분해대사 경로를 갖고 있는 것으로 예측된다. 뿐만 아니라, 각각의 phn clone($AEPn^+$, $MPn^+$, $GPS^+$)들은 PHO regulon의 조절유전자 phoBR에 의존하여 발현하였다. C-P compounds(Pn; phosphonate) such as glyphosate(GPS), aminoethylphosphonate(AEPn) and methyl-phosphonate(MPn) biodegrading genes were cloned from Pseudomonas sp. strain #A1 Which assimilated GPS as sole phosphorous source. Carrying out the in vivo molecular cloning by means of Mini-Mu plasmid, the size of clones($AEPn^+$, $MPn^+$, $GPS^+$) for the gene to degrade C=P compounds are 10-19Kb, 10Kb, and 12-18 Kb, respectively. Moreover, they expressed the phenotype for each Pn when they were transformed into $\Delta phn$ mutants. Hence, it is postulated that Pseudomonas sp.#A1 has three kind of Pn degradative pathway, separately. The phn clones($AEPn^+$, $MPn^+$, $GPS^+$) are verified as the members of PHO regulon because of their phoBR-dependent characteristics.

금강수역내에서 분리된 몇 종의 Ampicillin 내성균의 β-Lactamase 발현양상

이기성,고동규,최원창,문영길,박영식,최청일,최영길 ( Ki Sung Lee,Dong Kyu Ko,Won Chang Choi,Yong Keel Mun,Young Sik Park,Chung Il Choi,Yong Keel Choi ) 한국환경생물학회 1994 환경생물 : 환경생물학회지 Vol.12 No.1

In order to characterize the bacterial β-lactamase types occurred in Kum river area, this research was designed to analyze with identification upon ampicillin (Amp) resistant bacteria, and was investigated into relationships between β-lactamase expression (inducibility) and growth phase under ampicillin shift and with restriction patterns of R-plasmids. As the identification result upon 4 strains of Amp resistant bacteria, KL 601 is identified as Pasteurella maltocida, KL 602 as Enterobacter agglomerans, KL 609 as Pseudomonas maltophilia and KL 611 as Acinetobactor calcoaceticus, respectively. In order to investigate Amp effect upon growth, when the Amp resistant bacteria were cultivated in nutrient liquid LB medium, in LB medium added with Amp, or in LB medium in the manner of Amp shift, the changes in growth rate and lag phase could not be observed. However, upon the prototrophic strains, KL 602 and KL 609, examining Amp effect upon these two strains in minimal GM63 liquid media, even though there was no change of maximum growth yield, the latent lag phase become very lengthened. In nutrient medium, β-lactamase activities of these 4 strains were metabolically regulated in accordance with growth phase, on the other hand, in minimal medium were differently regulated in accordance with growth phase and with strains. It could be postulated that KL 609 strain has the M.W.24,000, β-lactamase type which E. coli comprise, however, that KL 601, KL 602 and KL 611 have the M.W.35,000, β-lactamase type which E. cloacae or C. freundii comprise. Through the whole growth phase, since Amp did not affect to phosholipid metabolism, there is no change in phospholipid compisition upon Amp effect. Main phospholipid are the phosphatidyl glycerol and cardiolipin in all 4 Amp resistant strains. So, it was very significant that there were no changes in phospholipid composition and in growth rate upon nutrient medium under Amp stress. In order to recognize whether Amp resistant strains comprise the plasmid or not, preparation of plasmids and restriction digestion with Bam H1 were carried out, KL 601 strain has about 30 Kb of plasmid, KL 609 and KL 611 strain have about 25 Kb of plasmid and KL 602 does not have the plasmid, however. Hence, it will be predicted strongly that β-lactamase gene in KL 602 might be encoded chromosomally. Moreover, considering the results upon the changes of β-lactamase acticity, upon β-lactamase inducibility and upon changes of periplasmic protein profile under Amp stress, its prediction is very recognizable.

A Study on the Multiple Trial of Unrelated Question Models

이기성,홍기학,Lee, Gi-Sung,Hong, Ki-Hak 한국데이터정보과학회 2002 한국데이터정보과학회지 Vol.13 No.1

In this paper, we proposed multiple trial unrelated question models that more efficient by reducing the variance of the estimate than single trial unrelated question models investigated by Greenberg et al.'s (1969) and Kim et al.'s (1992) an d Lee & Hong's (1998).

층화 가법 양적속성 확률화응답모형

이기성,안승철,홍기학,손창균,Lee, Gi-Sung,Ahn, Seung-Chul,Hong, Ki-Hak,Son, Chang-Kyoon 한국통계학회 2014 응용통계연구 Vol.27 No.2

본 논문에서는 사회적으로나 개인적으로 매우 민감한 조사에서 조사하고자 하는 모집단이 여러 개의 층으로 구성되어 있고, 각 층이 양적인 속성으로 되어 있는 경우에 Himmelfarb-Edgell의 가법 모형과 Gjestvang-Singh의 가법 모형에 단순임의추출법 대신에 층화추출법을 적용한 층화 가법 양적속성 확률화응답모형을 제안하였다. 제안한 두 모형으로부터 각 층의 양적속성에 대한 모평균의 추정뿐만 아니라 모집단 전체 모평균에 대한 추정을 할 수 있는 이론적 체계를 마련하였다. 그리고 제안한 두 모형에서 비례배분과 최적배분 문제를 다루었으며, 각 배분법에 따른 분산식을 도출하였다. 마지막으로 두 층화 가법 양적속성 확률화응답모형들 간의 효율성을 비교해 본 결과 Gjestvang-Singh의 층화 가법 모형이 Himmelfarb-Edgell의 층화 가법 모형보다 효율적으로 나타났고, 특히 hh값이 작을수록 즉, 제시한 모형의 특성이 직접질문에 가까워질수록 Gjestvang-Singh의 층화 가법 모형의 효율성이 커짐을 알 수 있었다. For a sensitive survey in which the population is composed by several strata with quantitative attributes, we present an additive stratified quantitative attribute randomized response model which applied stratified random sampling instead of simple random sampling to the models of Himmelfarb-Edgell's additive quantitative attribute model and Gjestvang-Singh's. We also establish theoretical grounds to estimate the stratum mean of sensitive quantitative attributes as well as the over all mean. We deal with the proportional and optimal allocation problems in each suggested model and compare the relative efficiency of the suggested two models; subsequently, Himmelfarb-Edgell's model is more efficient than Gjestvang-Singh's model under the condition of stratified random sampling.