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THE PARADOX OF BOARD STRUCTURE CHANGE
Bongjin Kim 한국전략경영학회 2012 전략경영연구 Vol.15 No.2
본 연구는 대리인 이론과 집사 이론에 기반하여 산업 내 규제완화 시 기업이 선택하는 이사회의 구조적인 변화를 검토하고 기업이 채택한 이사회의 구조적 특성이 기업성과에 미치는 영향을 고찰 하였다. 구체적으로 본 연구는 1980년대의 미국 금융 산업의 탈규제 기간 동안에 미국의 은행들을 대상으로 분석한 결과 다소 모순된 결과가 입증되었다. 1981-1992 기간 동안 은행들은 최고경영자와 이사회 의장의 겸직을 증가시키고 이사회의 규모를 축소하는 현상을 보였다. 이러한 변화는 새로운 경쟁환경 하에서 최고 경영자의 자유재량과 권한위임의 중요성을 강조하는 집사이론에 기반하여 설명될 수 있다. 그러나 같은 기간 동안 좋은 성과를 낸 은행들은 아이러니컬하게도 최고경영자와 이사회 의장을 분리한 경우와 큰 규모의 이사회를 가진 은행들이었음이 확인 되었다. 이러한 결과는 불확실한 경쟁환경 하에서 대리인문제의 통제를 강조하는 대리인이론에 기반하여 이해될 수 있다. 더 나아가 이러한 이사회의 구조적 특성과 기업 성과와의 관계는 이사회 구성원들의 소유지분에 따라 조절되는 현상이 입증 되었다. 따라서 본 연구는 기존의 이사회구조와 기업성과의 혼재된 연구결과에 새로운 방향과 설명력을 제시하였다는 점에 그 의의가 있다고 본다. Drawing on both agency and stewardship theories, we examine the changes made to board structures in response to deregulation and the consequences of those observed changes on firm performance. We test the hypotheses using longitudinal data from the U.S. banking industry over the period 1981-1992, a noted era of deregulation. The results yield rather paradoxical outcomes. Changes in board structures appear to follow stewardship theory logic but firm performance is better among banks that appear to rely on agency theory logic. Finally, the results indicate that board equity ownership moderates the relationship between board structures and firm performance within the context of deregulation.
Low-Complexity Parallel QPP Interleaver Based on Permutation Patterns
Bongjin Kim,Injae Yoo,In-Cheol Park IEEE 2013 IEEE transactions on circuits and systems. a publi Vol.60 No.3
<P>In this brief, we present how parallel-interleaved addresses generated by a quadratic permutation polynomial (QPP) interleaver are related to each other and propose a low-complexity parallel QPP interleaver based on the relationship. While a conventional parallel turbo decoder employs a number of interleavers as many as the parallel factor, the proposed method, which benefits from the arithmetic relationship denoted as the permutation pattern (PP), supports the parallel interleaving using only a single interleaver, resulting in a notable reduction of complexity. The strength of the proposed method stems from the fact that the PP is fully determined by only the decoding parameters, such as block size, parallel factor, and QPP coefficients. Experiment results on the Long Term Evolution turbo codes show that the proposed interleaver can significantly reduce the hardware complexity compared with conventional implementations.</P>
Bongjin Lee,Jun-Yeop Lee 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.2
For the release of the nuclear power plant site after the decommissioning, a reliable exposure dose assessment considering the environmental impact of residual radionuclides is essentially required. In this study, the Derived Concentration Guideline Level (DCGL) for the hypothetically contaminated surface soil at the Wolsong nuclear power plant (NPP) unit 1 site was preliminarily calculated by using the RESRAD-OFFSITE computational code and compared with the other case studies. Moreover, radiation exposure dose for local residents and relevant exposure pathways were quantitatively analyzed based on the calculation model established through this work. For the target site modeling, the source term was determined by referring to the previous case studies regarding the nuclear power plant decommissioning, quantification analysis data of pressure tubes of Wolsong NPP unit 1, and radionuclide data estimated by using the MCNP/ORIGEN-2 code. In total, 14 different radioisotopes such as Ag-108m, C-14, Co-60, Cs-134/137, Fe-55, H-3, Nb-93m/94, Ni-63, Sb-125, Sn-121m, Sr-90, and Zr-93 were considered as target radionuclides. In addition, the geological structure model of the Wolsong NPP site was established based on the final safety analysis report of Wolsong NPP unit 1. The distribution coefficients (Kd) were taken from the JAEA-SDB to estimate the migration/retardation behavior of various radionuclides under the groundwater condition of the Wolsong NPP site. In the present work, the DCGL values were calculated according to the site release criterion of 0.1 mSv/yr, which indicates the radiation protection standard for the site release. Moreover, the exposure pathway and sensitivity analyses were conducted to assess the sensitive input parameters remarkably influencing the calculation result. For the evaluation of exposure dose for local residents, a site layout centered around Wolsong NPP unit 4, located in the closest proximity to the residents’ habitation area, was alternatively established and all potential exposure pathways were considered as a comprehensive resident farmer scenario. The results obtained from this study are expected to serve as a preliminary case study for the DCGL values regarding the surface soil at the Wolsong NPP unit 1 site and for evaluating the radiation exposure dose to local residents resulting from the residual radioactivity at the site after the decommissioning.
Bongjin Lee,Hyung Joo Jeong,Yu Hyeon Choi,Chong Won Choi,June Dong Park 대한중환자의학회 2015 Acute and Critical Care Vol.30 No.4
Phacomatosis pigmentovascularis (PPV) is a rare syndrome characterized by concurrent nevus flammeus (capillary malformation) and pigmentary nevus. According to current research, the major pathophysiologic mechanism in PPV is venous dysplasia with resultant compensatory collateral channels and venous hypertension. Arterial involvement is rare. We herein report our experience on renovascular hypertension, intermittent claudication, and severe rhabdomyolysis due to diffuse stenosis of multiple arteries in a patient with PPV type IIb associated with SWS.