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Seonyoung Shim(심선영) 한국전략경영학회 2009 전략경영연구 Vol.12 No.2
온라인 채널은 증권 거래를 비롯한 금융 서비스에 매우 유용한 채널이다. 이러한 유용성은 온라인 증권사들의 비즈니스 기회를 확대함과 동시에 증권사간 경쟁을 심화시켜 왔다. 고객을 유인하기 위한 온라인 증권사의 대표적 경쟁 수단으로 낮은 수수료와 양질의 온라인 거래 시스템을 제공을 들 수 있다. 하지만, 두 전략의 실증적 효과에 대한 종합적 고찰은 찾아보기 어렵다. 따라서 본 논문에서는 8년간의 패널 데이터를 활용하여 저수수료 및 고품질의 서비스 전략이 온라인 증권사의 시장 점유율에 미치는 영향을 살펴본다. 연구의 결과는 온라인 거래 시스템 품질을 주요 변수로 부각하면서 맹목적 수수료 인하 전략의 허실을 지적한다. 따라서 이 연구는 온라인 증권거래를 비롯한 온라인 서비스 기업의 전략 수립에 있어 서비스 품질을 중요성을 시사한다. 또한 거래수수료 뿐만 아니라 이자 수익이 증권사의 성과에 주요한 요소임도 밝힘으로써, 전체 수익 증대를 위한 전략 모색에 시사점을 제공한다. The effectiveness of online medium to brokerage service not only delivers business opportunities but also intensifies competition between online brokerages. Although low price and high quality have received great attention as means of significant customer attraction strategies, there is a paucity of empirical study that investigates these two factors together in the online brokerage area. Hence we utilize price and quality as the lens to examine the determinants of online brokerage’s market share and empirically investigate the effects using firm level panel data spanning 8 years. Our study gives an important warning on the online brokerages’ reckless adoption of commission discount strategy. The quality of the trading system shows the central and dominant contribution to market share. The growing importance of interest revenue in the online brokerage business is also confirmed by our study. Our study delivers valuable implications for online brokerages as well as various e-commerce firms.
Design of a low-power real-time wavelet CODEC circuit
Seonyoung Lee,조경순 한국물리학회 2005 Current Applied Physics Vol.5 No.4
This paper presents the architecture and design of a CODEC circuit that can compress and reconstruct 4:2:2 color VGA videoimages using two-dimensional DWT. For real-time operation and low-power consumption, we modied the traditional Mallat’ssub-band coding method to reduce the amount of computation required in two-dimensional DWT. Using the modied method,two-dimensional DWT can be performed by two sets of one-dimensional DWT operations regardless of the number of decom-position levels. We adopted the systolic array architecture to design the circuit implementing our method. Our low-power real-timeCODEC circuit was designed using Verilog HDL and fabricated as a VLSI chip using 0.35l m 3.3 V CMOS standard cell process.We made a simple DVR system using our CODEC chip to store and retrieve the video image data to and from the hard disk, andobserved successful real-time operations..
( Seonyoung Kim ),( Seok-seong Kang ),( Soo-im Choi ),( Gun-hee Kim ),( Jee-young Imm ) 한국미생물 · 생명공학회 2019 Journal of microbiology and biotechnology Vol.29 No.1
Ecklonia cava, an edible marine brown alga (Laminariaceae), is a rich source of bioactive compounds such as fucoidan and phlorotannins. Ecklonia cava extract (ECE) was prepared using 70% ethanol extraction and ECE contained 67% and 10.6% of total phlorotannins and dieckol, respectively. ECE treatment significantly inhibited receptor activator of nuclear factor-κB ligand (RANKL)-induced osteoclast differentiation of RAW 264.7 cells and pit formation in bone resorption assay (p <0.05). Moreover, it suppressed RANKL-induced NF-κB and mitogen-activated protein kinase signaling in a dose dependent manner. Downregulated osteoclast-specific gene (tartrate-resistant acid phosphatase, cathepsin K, and matrix metalloproteinase-9) expression and osteoclast proliferative transcriptional factors (nuclear factor of activated T cells-1 and c-fos) confirmed ECE-mediated suppression of osteoclastogenesis. ECE treatment (100 μg/ml) increased heme oxygenase-1 expression by 2.5-fold and decreased intercellular reactive oxygen species production during osteoclastogenesis. The effective inhibition of RANKL-stimulated osteoclast differentiation and oxidative stress by ECE suggest that ECE has therapeutic potential in alleviating osteoclast-associated disorders.
Seonyoung Lee,Won Kim 대한신경정신의학회 2014 PSYCHIATRY INVESTIGATION Vol.11 No.1
Objective-Rumination is a negative coping strategy defined as repetitive and passive focusing on negative feelings such as depression. The Ruminative Response Scale (RRS) is a widely-used instrument to measure rumination, but there is continuing argument about the construct validity of the RRS, because of probable overlap between the measurement of depression and that of rumination. The RRS-Revised (RRS-R), which removed 12 items of the RRS, is suggested as a more valid instrument for measuring rumination. Therefore, we translated RRS-R into Korean and explored the reliability, validity and factor structure in patients with major depressive disorders. Methods-Seventy-nine patients with major depressive disorder took the Korean version of RRS, RRS-R, State Trait Anxiety Inventory, Beck Depression Inventory and Penn State Worry Questionnaire. We performed exploratory factor analysis of RRS-R, and tested construct validity, internal reliability and test-retest reliability. Results-The internal and test-retest reliability of RRS-R was high. Factor analysis revealed that RRS-R is composed of two factors. ‘Brooding’ factor explained 56.6% and ‘Reflection’ factor explained 12.5%. RRS-R, especially ‘Brooding factor’, was highly correlated with other clinical symptoms such as depression, anxiety and worry. Conclusion-In this study, we find out the RRS-R is more reliable and valid than the original RRS in Korean patients with depression because the RRS-R is free from the debate about the overlap of item with BDI. We also revealed that ‘Brooding’ is highly correlated with depressive symptoms. RRS-R may be a useful instrument to explore the implication of ‘Brooding’ in depression.
Pre and Post Evaluations on IT Platform Migration to Open Systems
Seonyoung Shim,Eunjin Kim 한국데이타베이스학회 2008 Journal of information technology applications & m Vol.15 No.3
IT platform migration to open systems (IPMO) bears a great deal of risk over all the associated processes, in terms of a major IT investment. Hence it requires empirical data and references for decision making. Although there have been a number of published papers encouraging or discouraging IPMO, the studies that deliver useful empirical evidence for IPMO decisions are rare. The obvious first step to resolve this problem would be to gain lessons from the organizations who experienced IPMO. Based on the Delphi study, we examine both the pre and post evaluations on IPMO benefits and risks and analyze the underlying reasons of different evaluations from different stages. Our results identify the most important factor the organizations should seriously consider, and which factor is easy to neglect at the ex-ante appraisal stage.
An Area-Efficient Integrated Architecture of Transform Circuit for WMV9/MPEG-4/H.264 Video Decoder
Seonyoung Lee,Kyeongsoon Cho 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
This paper proposes the new circuit architecture to integrate the IDCT operations of three most popular video compression standards: WMV9, MPEG-4 and H.264. The core of the proposed architecture is the concept of the delta coefficient matrix which exploits the similarities of the IDCT coefficients of WMV9, MPEG-4 and H.264. We implemented the integrated IDCT circuit based on this architecture using only adders and shifters, verified its operation on the FPGA board and synthesized the gate-level circuit using 130㎚ standard cell library. The synthesized circuit has 45,814 logic gates and its maximum operating frequency is 123.1㎒.