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The value of cash holdings, corporate governance, and ownership disparity
Dongwook Seo,Hohyun Kim,Seung Hun Han 한국경영학회 2016 한국경영학회 통합학술발표논문집 Vol.2016 No.8
This study examines the effect of business group, ownership disparity, and corporate governance on the value of excess cash using the business group (chaebols) data in Korea. Through the Fama and French (1998), we find that Korean chaebol firms have significantly higher value of excess cash compared to the non-chaebol firms, but the ownership disparity between cash flow right and control right of the controlling shareholders decreases the value of excess cash in chaebol firms. However, corporate governance enhances the value of excess cash in the whole samples of chaebol- and non-affiliated firms, and it also alleviates the negative effect of the ownership disparity in the value of excess cash of chaebol-affiliated firms. More specifically, we find that independency of the board of directors and audit committee enhance the value of excess cash in business group, and mitigates the negative effect of ownership disparity by controlling shareholders on the effect of excess cash on the frim value. Finally, we find that the impact of the use of excess cash on operating performance is significantly positive, and this positive effect is enhanced by corporate governance.
Seo, Dongwook,Lee, Si Un,Oh, Chang Wan,Kwon, O-Ki,Ban, Seung Pil,Kim, Tackeun,Byoun, Hyoung Soo,Kim, Young Deok,Lee, Yongjae,Won, Yu Deok,Bang, Jae Seung The Korean Neurosurgical Society 2019 Journal of Korean neurosurgical society Vol.62 No.6
Objective : To analyze the angiographic features and clinical course, including treatment outcomes and the natural course, of fusiform middle cerebral artery aneurysms (FMCAAs) according to their location, size, and configuration. Methods : We reviewed the literature on adult cases of FMCAAs published from 1980 to 2018; from 25 papers, 112 FMCAA cases, for which the location, size, and configuration could be identified, were included in this study. Additionally, 33 FMCAA cases in our hospital were included, from which 16 were assigned to the observation group. Thus, a total of 145 adult FMCAA cases were included. We classified the FMCAAs according to their location (l-type 1, beginning from prebifurcation; l-type 2, beginning from bifurcation; l-type 3, beginning from postbifurcation), size (small, <10 mm; large, ${\geq}10mm$; giant, ${\geq}25mm$), and configuration (c-type 1, classic dissecting aneurysm; c-type 2, segmental ectasia; c-type 3, dolichoectatic dissecting aneurysm). Results : The c-type 3 was more commonly diagnosed with ischemic symptoms (31.8%) than hemorrhage (13.6%), while 40.9% were found accidentally. In contrast, c-type 2 was more commonly diagnosed with hemorrhagic symptoms (14.9%) than ischemic symptoms (10.6%), and 72.3% were accidentally discovered. According to location, ischemic symptoms and hemorrhage were the most frequent symptoms in l-type 1 (28.6%) and l-type 3 (34.6%), respectively. Most of l-type 2 FMCAAs were found incidentally (68.4%). Based on the size of FMCAAs, only 11.1% of small aneurysms were found to be hemorrhagic, while 18.9% and 26.0% of large and giant aneurysms were hemorrhagic, respectively. Although four aneurysms of the 16 FMCAAs in the observation group increased in size and one aneurysm decreased in size during the observation period, no rupture was seen in any case and there were no significant predictors of aneurysm enlargement. Of 104 FMCAAs treated, 14 cases (13.5%) were aggravated than before surgery and all the aggravated cases were l-type 1. Conclusion : While ischemic symptoms occurred more frequently in l-type 1 and c-type 3, hemorrhagic rather than ischemic symptoms occurred more frequently in l-type 3 and c-type 2. In case of l-type 1 FMCAAs, more caution is required in determining the treatment due to the relatively high complication rate.
Seo, Young-ju,Park, Seongmin,Kang, Hyery,Ahn, Yun-Ho,Lim, Dongwook,Kim, Se-Joon,Lee, Jaehyoung,Lee, Joo Yong,Ahn, Taewoong,Seo, Yongwon,Lee, Huen Elsevier 2016 APPLIED ENERGY Vol.178 No.-
<P>A replacement technique has been regarded as a promising strategy for both CH4 exploitation from gas hydrates and CO2 sequestration into deep-ocean reservoirs. Most research has been focused on replacement reactions that occur in sI hydrates due to their prevalence in natural gas hydrates. However, sII hydrates in nature have been also discovered in some regions, and the replacement mechanism in sII hydrates significantly differs from that in sI hydrates. In this study, we have intensively investigated the replacement reaction of sII (C3H8 + CH4) hydrate by externally injecting CO2/N-2 (50:50) gas mixture with a primary focus on powder X-ray diffraction, Raman spectroscopy, NMR spectroscopy, and gas chromatography analyses. In particular, it was firstly confirmed that there was no structural transformation during the replacement of C3H8 + CH4 hydrate with CO2/N-2 gas injection, indicating that sll hydrate decomposition followed by sI hydrate formation did not occur. Furthermore, the cage-specific replacement pattern of the C3H8 + CH4 hydrate revealed that CH4 replacement with N-2 in the small cages of slI was more significant than C3H8 replacement with CO2 in the large cages of sII. The total extent of the replacement for the C3H8 + CH4 hydrate was cross-checked by NMR and GC analyses and found to be approximately 54%. Compared to the replacement for CH4 hydrate with CO2/N-2 gas, the lower extent of the replacement for the C3H8 + CH4 hydrate with CO2/N-2 gas was attributable to the persistent presence of C3H8 in the large cages and the lower content of N-2 in the feed gas. The structural sustainability and cage-specific replacement observed in the C3H8 + CH4 hydrate with external CO2/N-2 gas will have significant implications for suggesting target gas hydrate reservoirs and understanding the precise nature of guest exchange in gas hydrates for both safe natural gas production and long-term CO2 sequestration. (C) 2016 Elsevier Ltd. All rights reserved.</P>
서동욱(Seo Dongwook) 서강대학교 철학연구소 2021 철학논집 Vol.64 No.-
데리다의 사상은 크게 문자론과 타자론 두 영역으로 나눌 수 있다. 이 논문은 이 두 영역이 별개가 아니라 하나의 통일적인 해체론으로 이해되어야 함을밝힌다. 단적으로 문자론과 타자론이 보이고자 하는 것은 주체의 순수한 자기의식은 그 의식 외재적인 이질적인 것, 즉 문자와 타자의 개입을 통해서 성립한다는 것이다. 이 논문은 이런 문자론과 타자론의 통일성을 배경으로 데리다의 해체론이 가지는 정치적 의미를 드러낸다. 이러한 작업은 데리다 해체론의 정치적 의미를 부정적으로 평가하는 아감벤의 논의에 대한 비판을 경유해서 이루어진다. Derrida s philosophy can be divided into two main areas: the grammatology and the theory of the Other. This paper reveals that these two areas should be understood as a unified theory of deconstruction, not separate. In short, what the grammatology and the theory of the Other wants to show is that the pure self-consciousness of the subject is established by the intervention of the heterogeneous elements, namely, écriture and the Other. In addition, this paper clarifies the political meaning of Derrida s theory of deconstruction based on the unity of the grammatology and the theory of the Other. This work is done by carrying out criticism against Agamben s argument, which negatively evaluates the political significance of Derrida s deconstruction.
서동욱 이화여자대학교 한국문화연구원 2016 한국문화연구 Vol.30 No.-
이 논문은 청춘의 시간성을 규명하는 것을 목적으로 한다. 심리학, 교육학 등 인간의 연령대를 연구 대상으로 삼는 학문은 연령과 관련된 객관적․ 학문적 개념을 가지고 있다. 가령 ‘사춘기(puberty)’ 개념이 대표적일 것이다. 그러나 청춘이나 젊음이라는 말은 학문적으로 객관적인 내포와 외연을 지니지 않는다. 청춘이라는 말은 학문의 필요상 고안된 규약적 개념이 아니기 때문이다. 오히려 청춘은 화용론적인 차원에서 접근될 수 있는 말이다. 보다 구체적으로 청춘은 주체가 스스로의 정체성을 확립하는 실천에 사용되는 말이다. 이 정체성의 확립은 시간적인 차원에서 이루어진다. 청춘이라는 말을 통해 주체가 스스로의 정체성을 확립할 때 주체는 ‘상실된 시간으로서의 청춘’과 관계한다. 노년 역시 청춘의 상실이 실체화하는 방식으로 이해될 수 있으며, 이런 점에서 청춘은 주체가 시간을 질서 짓는 방식이라 할 수 있다. 이런 논의의 연장선에서 이 논문은 ‘회춘’이라는 주제 역시 다룬다. 노년의 시간을 특징짓는 한 방식인 회춘은 ‘반복’ 개념을 통해 그 의의가 밝혀진다. The purpose of this study is to elucidate the temporality of ‘youth (Chungcheun;靑春;literally, springtime).’ The East-Asian word Chungcheun is, like a French expression printemps de la vie, of ordinary languages rather than of scientific notions. This means that the Chungcheun can be recognized only on the pragmatic ways of its usages. Specifically, this word is used as a function by which the subject constitutes its own identity with regards to the temporal dimensions, the past and the future. More concretely, the subject relates its identity to the Chungcheun as the loss of the passed times. After this investigation, the meaning of ‘old age’ as time for the ‘rejuvenation’ is also examined by means of the concept of the ‘repetition.’
ORiginal Article : Endoscopic Management of Bile Leakage after Liver Transplantation
( Dongwook Oh ),( Sung Koo Lee ),( Tae Jun Song ),( Do Hyun Park ),( Sang Soo Lee ),( Dong Wan Seo ),( Myung Hwan Kim ) The Editorial Office of Gut and Liver 2015 Gut and Liver Vol.9 No.3
Background/Aims: Endoscopic retrograde cholangiopancreatography (ERCP) can be an effective treatment for bile leakage after liver transplantation. We evaluated the efficacy of endoscopic treatment in liver transplantation in patients who developed bile leaks. Methods: Forty-two patients who developed bile leaks after liver transplantation were included in the study. If a bile leak was observed on ERCP, a sphincterotomy was performed, and a nasobiliary catheter was then inserted. If a bile leak was accompanied by a bile duct stricture, either the stricture was dilated with balloons, followed by nasobiliary catheter insertion across the bile duct stricture, or endoscopic retrograde biliary drainage was performed. Results: In the bile leakage alone group (22 patients), endoscopic treatment was technically successful in 19 (86.4%) and clinically successful in 17 (77.3%) cases. Among the 20 patients with bile leaks with bile duct strictures, endoscopic treatment was technically successful in 13 (65.0%) and clinically successful in 10 (50.0%) cases. Among the 42 patients who underwent ERCP, technical success was achieved in 32 (76.2%) cases and clinical success was achieved in 27 (64.3%) cases. Conclusions: ERCP is an effective and safe therapeutic modality for bile leaks after liver transplantation. ERCP should be considered as an initial therapeutic modality in post-liver transplantation patients. (Gut Liver 2015;9:417-423)