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이재홍,이재홍,조정은 한국증권학회 2016 Asia-Pacific Journal of Financial Studies Vol.45 No.2
This study examines the effects of controlling shareholders’ ownership–control wedge on firms’ overinvestment practices. In addition, it further investigates the incentive effects of controlling shareholders’ cash flow rights on firms’ overinvestment. We find a non-monotonic relation between controlling shareholders’ ownership–control wedge and a firm’s overinvestment. Specifically, the relation between controlling shareholders’ wedge and overinvestment is significant for certain wedge levels. Thus we conclude that controlling shareholders with certain levels of wedge expropriate minority shareholders’ benefits since the marginal benefit exceeds the marginal cost. We also document that cash flow rights are effective to reduce a firm’s overinvestment to certain levels.
이재홍,고재민,윤선주 한국산업경영학회 2020 經營硏究 Vol.35 No.2
This study investigates how the earnings forecast behavior of a financial analyst is influenced by a stock price crash in a peer firm. The additional influence including the individual characteristics of the analyst‘s industrial expertise and the comparability of the financial statement was also observed. As a result, in cases where a stock price crash occurs in a peer firm, the information transfer effect could be observed. Also, the magnitude of the information transfer effect showed that the higher the industrial expertise of the financial analyst, the higher the comparability of the financial statements, and the larger the firm that experienced stock price crash, the greater the effect would be.
D2EHPA 및 Dithizone 에 의한 납의 추출평형
이재홍,남세종 한국화학공학회 1990 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.28 No.3
납 수용액으로부터 di(2-ethylhexyl) phosphoric acid(D₂EHPA)-carbon tetrachloride와 diphenylthiocarbazone(dithizone)-chloroform을 사용한 추출평형을 측정하였다. D₂EHPA일 때 적용한계 부하비 0.05 이하에서 추출화학종은 PbR₂(RH)₂이고 평형상수는 3.0×10^(-3)이었으며, 추출제 dithizone일 때 적용한계 부하비 0.03 이하에서 추출화학종은 Pb(Dz)₂이고 평형상수는 1.2×10^(-1)이었다. 한계 부하비를 넘으면 추출화학종과 평형상수는 D₂EHPA일 때 (PbR₂)_n(RH)₂, 6×10^(-3)이고 dithizone일 때[Pb(Dz)₂]_n, 2.2[㎥/㏖]로 각각 변하였다. 식초산 완충용액을 수용액상에 가하면 추출상수는 다소 감소하였고 유기상에 계면활성제 Span #80을 첨가하면 평형상수는 약간 증가하였다. Measurements of the extraction equilibrium of lead acetate aqueous solution with di(2-ethylhexyl) phosphoric acid (D₂EHPA) in carbon tetrachloride, and diphenylthiocarbazone (dithizone) in chloroform were carried out at 25℃. Over the range of loading ratios less then 0.05 for D₂EHPA and 0.03 for dithizone, the extracted organic metal species and equilibrium constants were found to PbR₂(RH)₂. 3.0×10^(-3) for D₂ZEHPA and to Pb(Dz)₂. 1.2×10^(-1) for dithizone. Upon increasing the loading ratio above the threshold value, the extracted chemical species and equilibrium constants were estimated to (PbR₂)_n(RH)₂. 6×10^(-3) for D₂EHPA, and to [Pb(Dz)₂]_n, 2.2[㎥/㏖] for dithizone. The equilibrium constants were found to decrease upon adding of acetic buffers, and to a little increase by addition of Span#80.
이재홍,정성념 대한구강악안면임플란트학회 2021 대한구강악안면임프란트학회지 Vol.25 No.4
Purpose: Various bone graft materials are currently used for guided bone regeneration (GBR), but data are lacking on the superiority of one biomaterial relative to the other. In addition, achieving successful bone augmentation remains challenging. When used in GBR, block bone substitutes show better augmentation stability of the bone than particulated bone substitutes. Recently developed softtype block bone substitutes are widely used in clinical practice. Materials and Methods: This study enrolled 12 patients who underwent implant placement with GBR in the mandibular anterior region between September 2016 and May 2021 in the Department of Periodontology, Daejeon Dental Hospital, Wonkwang University. GBR was performed using demineralized porcine bone mineral with 10% collagen (DPBM-C; LegoGraft®) and a resorbable collagen membrane (Bio-Gide® or Ossix Plus®). The surgical site was sutured with 4-0 e-PTFE (Biotex®) and 5-0 nylon (Monosof®) by using modified horizontal mattress and interrupted suture methods. Stitch-out was performed two weeks af ter the operation, and reentry surgery was performed within four to six months after the implant surgery. Results: There was a significant decrease in bone thickness after five months of implant surgery with GBR compared with the decrease immediately after surgery. However, bone gains of more than 1.5 mm were observed at all measurement sites compared with those at baseline. Conclusion: GBR performed using demineralized porcine bone mineral with 10% collagen in combination with a resorbable collagen membrane is an effective and favorable treatment modality for peri-implant dehiscence defects in terms of clinical and radiographic outcomes during the healing period.
이재홍 한국디지털스토리텔링학회 2010 디지털스토리텔링연구 Vol.5 No.-
오늘날 인류 삶의 모든 분야로 확대되고 있는 공유, 개방, 참여의 웹2.0의 철학과 정신은 정치, 경제, 경영, 심리학, 철학, 저널리즘 등에 이르는 다양한 분야에서 논의되고 있다. 정치학이나 사회학에서 많이 차용되고 있는 정보의 공유, 개방, 참여의 정신은 소셜 네트워크(social network), 블로그, UCC와 같은 개인 중심의 매체에서 활성화되어 언론이나 저널리즘 등과 같은 분야에서 아주 섬세하게 연구되어 왔다.1) 최근에는 특히 IT산업 변혁의 중심에 서 있는 스마트폰 분야에서 이러한 논의와 연구들이 활발하게 이루어지고 있다. 일반적으로 디지털 카메라, mp3, 동영상 플레이어 등과 같은 기능과 온라인 어플리케이션을 통하여 다양한 콘텐츠를 이용할 수 있는 작은 컴퓨터 기능이 탑재된 휴대 전화(mobile phone)를 스마트폰(smart phone)이라고 한다. 특히 스마트폰의 대명사처럼 여겨지던 ‘블랙 베리(Black Berry)’의 아성을 무너뜨리며 급성장하는 아이폰 시리즈의 거침없는 행진은 미국의 정보통신기술(ICT) 시장의 지각 변동을 일으키고 있으며, 이러한 현상들은 우리의 IT산업에까지도 크게 영향을 미치고 있다. 지난 6월 24일, 한국에서는 삼성이 ‘갤럭시S’를 출시하였고, 그보다 하루 전날인 23일, 미국에서는 애플이 ‘아이폰4’를 출시하였다. 한국과 미국에서는 두 스마트폰을 구입하기 위한 열기가 대단하다는 소식이 연일 이어지고 있다. 모바일 폰 시장의 무한 경쟁시대를 예고하는 서막이 열린 것이다.