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김민정,김홍기,Kim, Minjeong,Kim, Honggie 한국통계학회 2017 응용통계연구 Vol.30 No.4
Ghosh와 Kim에 의해 소개된 영 변환 모형은 0이 많거나 적을 때 계수형 자료(count data)를 분석하는 모형이다. 이 모형의 산포형태모수는 평균과 분산, 0 확률로 구성되며 ${\mu}$와 ${\sigma}^2$의 관계에 따라 2가지 형태를 가진다. 본 논문에서는 ${\sigma}^2{\geq}{\mu}$일 때, Ghosh와 Kim 영 변환확률 모형의 모수 ${\delta}$에 대한 영향함수를 도출하였다. 도출한 영향함수의 타당성을 검증하기 위해서 인구주택총조사 자료를 이용해 관측치가 제거된 경우에서 영향함수로 도출한 ${\delta}$ 추정치 변화값과 직접 계산한 ${\delta}$ 추정치 변화값을 비교하였다. 그 결과 영향함수는 ${\delta}$의 변화를 매우 정확히 추정하였다. The Ghosh and Kim zero-altered distribution model is used to analyze count data that have too many or too few zeros. The dispersion type parameter ${\delta}$ in the zero-altered distribution model consists of mean, variance and zero probability and has two forms depending on the relation between ${\mu}$ and ${\sigma}^2$. We derived the influence function on ${\delta}$ when ${\sigma}^2{\geq}{\mu}$. To show the validity of the influence function, we used the Census data on the number of births of married women in Korea to compare the estimated changes in ${\delta}$ using this function with those obtained using the direct deletion method. The result proved that the obtained influence function is very accurate in estimating changes in ${\delta}$ when an observation is deleted.
IMPROVING GOODNESS OF FIT IN PRINCIPAL COMPONENT ANALYSIS USING INFLUENCE FUNCTION
Kim, Honggie 충남대학교 기초과학연구소 1994 忠南科學硏究誌 Vol.21 No.1
We introduce influence function in principal component analysis (PCA) derived by Critchley (1985) and show how to use it to improve goodness of fit in two dimensional PC plot. Kim (1992) derived the influence function that measures influence of rows and columns on the eigenvalues obtained in correspondence analysis (CA) of two-way contingency tables. As in principal component analysis, the eigenvalues are of great importance in CA. The goodness of a two dimensional PC plot or correspondence plot is determined by the ratio of the sum of the two largest eigenvalues to the sum of all the eigenvalues. By investigating those observations (rows or columns in CA) with high influence, a PC plot (correspondence plot in CA) may be improved. It is shown how the goodness of fit can be improved using the influence functions and numerical examples are presented.
Influence Function on Tolerance Limit
Kim, Honggie,Lee, Yun Hee,Shin, Hee Sung,Lee, Sounki 한국통계학회 2003 Communications for statistical applications and me Vol.10 No.2
Under normality assumption, the tolerance interval for a future observation is sometimes of great interest in statistics. In this paper, we state the influence function on the standard deviation $\sigma$, and use it to derive the influence function on tolerance limits. Simulation study shows that the two influence functions perform very well.
Synergistic Effects of Terpolymer Regioregularity on the Performance of All-Polymer Solar Cells
Kim, Sang Woo,Kim, Honggi,Lee, Jin-Woo,Lee, Changyeon,Lim, Bogyu,Lee, Jaechol,Lee, Youngu,Kim, Bumjoon J. American Chemical Society 2019 Macromolecules Vol.52 No.2
<P>Random terpolymers with three different monomer units can provide broader light absorption than the most widely used donor-acceptor (D-A) alternating copolymers, but their electrical properties are often sacrificed by the randomly distributed monomers in the polymeric backbone that prevent efficient intermolecular π-π interactions. Here, we report the development of a regioregular terpolymer and demonstrate its importance in enhancing the power conversion efficiency (PCE) of all-polymer solar cells (all-PSCs). To investigate the impact of the monomer sequence and regioregularity in the terpolymer, we designed and synthesized two terpolymers (Ra-(D<SUB>1</SUB>-A-D<SUB>2</SUB>-A) random terpolymer and RR-(D<SUB>1</SUB>-A-D<SUB>2</SUB>-A) regioregular terpolymer) consisting of two electron-donating benzodithiophene (BDT) units with different side chains and one electron-withdrawing fluorinated thieno[3,4-<I>b</I>]thiophene (TT-F) unit. As a reference polymer, we also synthesized the D<SUB>1</SUB>-A alternating copolymer. The RR-(D<SUB>1</SUB>-A-D<SUB>2</SUB>-A) film exhibited stronger π-π stacking and a larger crystallite size than the D<SUB>1</SUB>-A and Ra-(D<SUB>1</SUB>-A-D<SUB>2</SUB>-A) films, resulting in 1 order of magnitude higher hole mobility than those of the other polymers. When blended with the P(NDI2HD-DTAN) polymer acceptor, the RR-(D<SUB>1</SUB>-A-D<SUB>2</SUB>-A)-based all-PSC yielded an outstanding PCE of 6.13%, which was superior to those of the D<SUB>1</SUB>-A-based all-PSCs (4.81%) and Ra-(D<SUB>1</SUB>-A-D<SUB>2</SUB>-A)-based all-PSCs (4.93%). These findings indicate that the synthesis of the regioregular terpolymer is a promising design strategy for the development of high-performance all-PSCs with improved optical and electrical properties.</P> [FIG OMISSION]</BR>
독일 산업ㆍ기술문화재 노르트스테른 폐광산 재생 사례 분석
김홍기(Kim, Honggi),김세용(Kim, Sei-Yong),주범(Chu, Beom) 한국실내디자인학회 2011 한국실내디자인학회논문집 Vol.20 No.5
Industrial/Technological Cultural Properties are closely related to contemporary life, and have played the dominant role as a bridge between the traditional architectural buildings and contemporary architectural buildings, reflecting the overall economical, social and cultural portraits of that time. Nowadays, due to various sprawling developments and new development-oriented urban policies, only a select few Industrial/Technological Cultural Properties are being protected, the rest facing with demolition and damages. In order to better cope with such situation, Korea has officially introduced the Registered Cultural Properties System since 2001, and began acknowledging the historical values of industrial buildings as modern cultural properties. Under this circumstances, purpose of this study is to analyze main project plans of each facility in Abanoned Nordstem Mine Gelsenkirchen in the state of Nordhein-Westfalen, that have been preserved and recycled as office spaces. and to bring out the main features of the plans, so that they can be utilized to find suggestions for Industrial /Technological Cultural Properties Revitalization.
역사적 관광요소와 공동주거를 활용한 마을 프로그램 제안
김홍기(Kim Honggi),김벽연(Kim Byeoukyeoun),전아현(Jeon, Ahyeon),이지은(Lee, Jeeun),조용훈(Cho, Yonghoon) 한국주거학회 2020 한국주거학회 학술대회논문집 Vol.32 No.2
The purpose of this paper is to revitalize the stagnant Anseong by forming a new type of co-residential complex and tourism planning utilizing historical factors. The analysis data needed to write this paper was conducted through a survey for two weeks from April 16, 2020, and through these surveys and analysis of Anseong"s urban structure, it was intended to analyze the current situation in Anseong and the situation in Seongnam Okcheon district to derive appropriate activation directions. The current physical status of Seongnam Okcheon district is as follows. 1) Deteriorated low-rise residential complex 2) Small-scale buildings 3) Lack of cultural facilities 4) lack of rest area. Therefore, to revitalize Seongnam Okcheon district, the following plan is proposed. 1) Restoration project utilizing historical factors 2) Combining new users through youth 3) Proposal of new cohabitation according to users 4) Forming a space for various communities.