SINGULAR INTEGRALS ON CERTAIN ORLICZ CLASSES AND ZYGMUND SPACES

KIM, DOHIE,CHO, YONG-KUM,KIM, MIRAN,KOH, DOOWON 中央大學校 基礎科學硏究所 1998 基礎科學硏究所 論文集 Vol.12 No.-

In this paper we consider the original versions of Calderon-Zygmund singular integrals and set up a list of boundedness properties on certain Orlicz classes as wel as Zygmund spaces L log L and ??.

IRM SIZE AND BOOK-TO-MARKET FACTORS IN KOREAN STOCK RETURNS

Seokchin Kim,Jiyoung Kim,Doowon Bae 한국로고스경영학회 2007 한국로고스경영학회 학술발표대회논문집 Vol.2007 No.7월_2

This study examines the effect of firm size and BE/ME (Book equity-to-Market equity ratios) factors, and tests Fama and French (1993) three-factor model in Korean stock market. In addition, we also investigate the effect of the new-listing bias and survivorship bias on the expected stock returns. Our study examines 96 monthly data on common stocks listed in Korean Stock Exchange from January 1990 to December 1997. These samples have December fiscal year ending and we except for financial or institutional firm. The systematic risk for an individual stock, beta (β), is estimated through the market model using 24 monthly returns just before the composition of portfolio. The sample consists of 452 firms listed on KSRI from 1990 to 1997 (sample A), 558 firms include of 106 newly listed firms for estimation periods (sample B), 494 include of 42 delisted firms (sample C), and 600 include of these all firms (sample D). The sample C has not bias but the sample A is affected by the survivorship bias, the sample B has the new-listing bias and the survivorship bias, and sample D is affected by the new-listing bias. The number of firms in sample B, C and D changed every year. Each firm is allocated to 25 portfolios sorted based on their firm size and BE/ME. According to the results of cross-sectional regressions, firm size have a significant negative (-) sign in sample A and C, but not significant in the sample Band D. That is, there is size effect and new listing bias is serious enough to offset the size effect but the effect of survivorship bias is insignificant. On the other hand, BE/ME have a significant positive (+) sign in all the samples BE/ME effect is robust about the survivor and new-listing biases and β is not significant. According to the result of time series analysis, market factor, firm size and BE/ME factor appear all to be significant variables explaining stock returns, which suggests that the three-factor model is useful in explaining expected stock returns. The significance of the three-factor model appears to be somewhat affected by new listing bias and the effect of survivorship bias was negligible.

Crystallite에 따른 Ag plating 분석

이두원(Doowon Lee),김현호(Hyunhoo Kim),박효민(Hyomin Park),박성은(Seongun Park),탁성주(Seongjoo Tak),김동환(Donghwan Kim) 한국신재생에너지학회 2012 한국신재생에너지학회 학술대회논문집 Vol.2012 No.06

Firm Size and Book-to-Market Factors in Korean Stock Returns

Seokchin Kim,Jiyoung Kim,Doowon Bae 한국로고스경영학회 2007 한국로고스경영학회 학술발표대회논문집 Vol.2007 No.7월

This study examines the effect of firm size and BE/ME (Book equity-to- Market equity ratios) factors, and tests Fama and French (993) three - factor model in Korean stock market. In addition. we also investigate the effect of the new-listing bias and survivorship bias on the expected stock returns. Our study examines 96 monthly data on common stocks listed in Korean Stock Exchange from January 1990 to December 1997. These samples have December fiscal year ending and we except for financial or institutional firm. The systematic risk for an individual stock, beta (β). is estimated through the market model using 24 monthly returns just before the composition of portfolio. The sample consists of 452 firms listed on KSRI from 1990 to 1997 (sample A), 558 firms include of 106 newly listed firms for estimation periods (sample B). 494 include of 42 delisted firms (sample C). and 600 include of these all firms (smaple D). The sample C has not bias but the sample A is affected by the survivorship bias, the sample B has the new-listing bias and the survivorship bias. and sample D is affected by the new-listing bias. The number of firms in sample B. C and D changed every year. Each firm is allocated to 25 portfolios sorted based on their firm size and BE/ME. According to the results of cross- sectional regressions. firm size have a significant negative (-) sign in sample A and C, but not significant in the sample Band D. That is. there is size effect and new listing bias is serious enough to offset the size effect but the effect of survivorship bias is insignificant. On the other hand, BE/ME have a significant positive (+) sign in all the samples BE/ME effect is robust about the survivor and new-listing biases and ;9 is not significant. According to the result of time series analysis, market factor. firm size and BE/ME factor appear all to be significant variables explaining stock returns. which suggests that the three-factor model is useful in explaining expected stock returns. The significance of the three-factor model appears to be somewhat affected by new listing bias and the effect of survivorship bias was negligible.

가소성 경량기포콘크리트의 배합비 변화에 따른 공학적 특성

서두원(Seo Doowon),김혜양(Kim Hyeyang),김경민(Kim Kyungmin),천병식(Chun Byungsik) 한국지반환경공학회 2010 한국지반환경공학회논문집 Vol.11 No.4

구조물 뒤채움재로서 하중경감을 위해 사용되는 경량기포콘크리트는 기포의 소포작용에 의해 체적이 감소하여 재주입하는 문제점이 있다. 따라서 본 연구에서는 체적의 감소 문제를 보완하고자 가소제를 첨가한 가소성 경량기포콘크리트를 제작하였고, 공학적 특성을 실험적으로 규명하고자 하였다. 가소성 경량기포콘크리트의 공학적 특성을 파악하기 위해 배합요소들의 변화에 따른 일축압축강도, 단위중량, flow, pH, 투수시험에 대한 연구를 진행하였다. 실험결과로부터 가소제의 첨가에 따른 공학적 특성을 비교분석하였고, 에트링자이트의 생성으로 인하여 flow값에 가장 큰 영향을 주는 것으로 나타났다. 가소제의 적정 첨가량은 2~2.4%정도가 적당할 것으로 판단되며, 구조물 배면의 충전재료로 사용하여 하중 경감측면과 재료의 과도한 유동성에 의한 안정성 증가에 큰 효과가 있을 것으로 판단된다. The lightweight foamed concrete is used to reduce the weight of the backfill material. When it is applied, the volume is often contracted due to segregation, necessitating re-injection. In this study, it was manufactured a new lightweight foamed concrete by adding plasticizer and tested the engineering properties of the material. The tests included unconfined compressive strength test, unit weight test, flow test, pH test, and permeability test. The plasticizer is shown to have an important influence on the flow. It was shown that 2~2.4% of plasticizer was adequate. The new material was shown to have positive influence on the flow and reduction of weight when applied to the backfill of the structures.

Change in Interfacial Dzyaloshinskii-Moriya interaction due to Ruthenium spacer

Jiyoung Lee,Ye Eun Kim,Doowon Kim,Han Sol Kim,Young Keun Kim 한국자기학회 2023 한국자기학회 학술연구발표회 논문개요집 Vol.33 No.1

3차원 공간 탐색을 위한 헬리콥터 조종사 메타포어와 그 구현

김영경(Young-Kyoung Kim),정문렬(Moon-Ryul Jung),백두원(Doowon Paik),김동현(Dong-Hyun Kim) 한국컴퓨터그래픽스학회 1997 컴퓨터그래픽스학회논문지 Vol.3 No.1

Improved yield in molecular electronic devices using amino-style molecules

구자룡,Sang-Woo Pyo,Jun-Ho Kim,Doowon Gong,So-Young Kim,Ji Hoon Seo,Young Kwan Kim 한국물리학회 2007 Current Applied Physics Vol.7 No.4

Molecular electronic devices were fabricated with amino-style derivatives as redox-active components. These molecules are amphi-philic to allow monolayer formation by the LangmuirBlodgett (LB) method, and this LB monolayer is inserted between two metal elec-trodes. On measuring the currentvoltage (IV) characteristics, it was found that the Al/amino style LB monolayer/Al devices showremarkable hysteresis and switching behavior, so that they can be used as memory devices at ambient conditions, when an aluminumoxide layer exists on the bottom electrode. From the results ofIV measurements, we acquired values of the switching voltage and somearea of the device and by inserting a Ti protecting layer between the top metal electrode and the amino style LB monolayer.

실내건축 공사원가 관리 시스템 개발에 관한 연구

金億,徐枓源 弘益大學校 科學技術硏究所 2003 科學技術硏究論文集 Vol.14 No.-

This study aims at the development of a cost management tool in building interior projects. For this study cost elements are defined in terms of break-down interior works which consist of materials and labors. A data model for cost elements was developed, and a relational database is used to realize cost data management based upon this data model. Data input and output are achieved by Internet from both wired PC and wireless mobile phone. This tool can timely display a number of needed reports for cost management that identifies cash flow and predicts budget for break-down works in interior projects.

대구국제임베디드컨퍼런스의 경제적 파급효과

김석진,도영호,배두원 경북대학교 경제경영연구소 2007 經商論集 Vol.34 No.2

본 논문은 『2007 대구국제임베디드컨퍼런스』가 대구 · 경북 경제에 미치는 영향을 연구하였다. 본 연구는 국제회의와 전시박람회를 겸한 컨퍼런스가 지역 경제에 미치는 파급효과를 국내 처음으로 분석한 점에서 그 의의가 있다고 하겠다. 컨퍼런스 기간 동안 5억 1천만 원의 계약이 체결되었으며 대략 9억 5천만 원의 계약이 체결될 것으로 조사되었다. 산업연관분석과 지역산업연관표를 이용하여 이미 발생한 최종수요(참가자 · 주최자 지출액, 성사된 계약액)와 향후에 발생할 최종수요(계약 체결액의 기댓값)로 나누어 파급효과를 살펴보았다. 추정결과 컨퍼런스로 인해 각 산업부문에 파급되는 생산유발효과는 약 27억 1천만 원이었고 생산활동으로 인한 부가 가치유발효과는 약 9억 2천만 원이었다. This paper exammes the economic effects of 『2007 Daegu international Embedded Conference』. The study is significant in that it first investigates how much this conference with international meetings and expositions affects the economy of the Daegu and Gyeongbuk region. An interindustry analysis and a regional input/output table are employed for evaluating the economic spill-over effects. We divide the final demand into the expected part which is the expected contract amount and the realized part which consists of the already fixed contract amount and expenditures of the organizer and participants. The amount of around 0.51 billion won is already contracted and the additional amount of about 0.95 billion won are expected to be contracted due to this conference. Thus, it is estimated that this conference would induce the output of 2.71 billion won and the value-added of 0.92 billion won for the Daegu and Gyeongbuk region.