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다채널 지표토양 CO2 농도 모니터링(SCM) 시스템 개발 및적용성 평가 연구
성기성,유순영,최병영,박진영,한래희,김정찬,박권규,채기탁 한국지하수토양환경학회 2015 지하수토양환경 Vol.20 No.1
Monitoring of CO2 release through the ground surface is essential to confirm the safety of carbon storage projects. Weconducted a feasibility study of the multi-channel surface-soil CO2-concentration monitoring (SCM) system as a soil CO2monitoring tool with a small scale injection test. The background concentrations showed the distinct diurnal variation. Thenegative relation of CO2 with temperature and the low CO2 concentrations during the day imply that surface-soil CO2depends on photosynthesis and respiration. After 4.2 kg of CO2 injection (1 m depth for 29 minutes), surface-soil CO2concentrations increased in the all five chambers, which were located less than 2.8 m of distance from each other. The CO2concentrations seem to be recovered to the background around 4 hours after the injection ended. To determine the leakage,the data from Chamber 2 and 5 with low increase rates were used for statistical analyses. Coefficient of variation for 30minutes (CV30min.) is efficient to determine a leakage signal, with reflecting the fast change in CO2 concentrations. Consequently, SCM and CV30min could be applied for an efficient monitoring tool to detect CO2 release through theground surface. Also, this study provides ideas for establishing action steps after leakage detection.
대리문제에 의한 기업의 경영자지분율의 결정요인에 관한 연구
성기성 인하대학교 산업경제연구소 1997 경상논집 Vol.11 No.2
This study investigates the determinants of managerial stock ownership in the firm within the framework of agency theory through the examination of six variables- dividend pay out ratio, debt, ratio, institutional stock ownership, firm size, growth rate, and business risk. The results reveals that managerial common stock ownership is inversely related to the firm's dividend payout ratio and debt level as predicted. This study also hypothesizes that the managerial ownership is inversely related to the extent of monitoring by institutional investors. Consistent with this hypothesis, institutional stock ownership is found to be negatively related to the managerial equity holdings in the firm. However, this study suggests that both the firm size and the business risk have statistically insignificant impact on managerial stock ownership in the firm
기업의 경영자지분율과 레버리지의 동시적 결정요인에 관한 연구
성기성 인하대학교 산업경제연구소 1998 경상논집 Vol.12 No.2
This study investigates the determinants of managerial stock ownership and corporate leverage simultaneously within the framework of agency theory. For this purpose six variables - corporate leverage, institutional stock ownership, growth rate, business risk, firm size, and dividend payout ratio - are selected for managerial stock ownership. And also six variables - managerial stock ownership, institutional stock ownership, growth rate, business risk, depreciation ratio, and firm size - are selected for corporate leverage. The result reveals that both the corporate leverage and the dividend payout ratio are found to be negatively related to the managerial stock ownership in the firm as predicted. However, this study shows that the other variables selected for managerial stock ownership have statistically insignificant impact on the determination of managerial stock ownership. In the case of corporate leverage, this study reveals that both the managerial stock ownership and the institutional stock ownership are found to be negatively related to the corporate leverage ratio. The three variables - business risk, depreciation ratio, and firm size - are found to have positive relationships with corporate leverage as predicted
다채널 지표토양 CO<sub>2</sub> 농도 모니터링(SCM) 시스템 개발 및 적용성 평가 연구
성기성,유순영,최병영,박진영,한래희,김정찬,박권규,채기탁,Sung, Ki-Sung,Yu, Soonyoung,Choi, Byoung-Young,Park, Jinyoung,Han, Raehee,Kim, Jeong-Chan,Park, Kwon Gyu,Chae, Gitak 한국지하수토양환경학회 2015 지하수토양환경 Vol.20 No.1
Monitoring of $CO_2$ release through the ground surface is essential to confirm the safety of carbon storage projects. We conducted a feasibility study of the multi-channel surface-soil $CO_2$-concentration monitoring (SCM) system as a soil $CO_2$ monitoring tool with a small scale injection test. The background concentrations showed the distinct diurnal variation. The negative relation of $CO_2$ with temperature and the low $CO_2$ concentrations during the day imply that surface-soil $CO_2$ depends on photosynthesis and respiration. After 4.2 kg of $CO_2$ injection (1 m depth for 29 minutes), surface-soil $CO_2$ concentrations increased in the all five chambers, which were located less than 2.8 m of distance from each other. The $CO_2$ concentrations seem to be recovered to the background around 4 hours after the injection ended. To determine the leakage, the data from Chamber 2 and 5 with low increase rates were used for statistical analyses. Coefficient of variation for 30 minutes ($CV_{30min}$.) is efficient to determine a leakage signal, with reflecting the fast change in $CO_2$ concentrations. Consequently, SCM and $CV_{30min}$ could be applied for an efficient monitoring tool to detect $CO_2$ release through the ground surface. Also, this study provides ideas for establishing action steps after leakage detection.
성기성(Gi Seong Seong),강만수(Man Su Kang),석영기(Yeung Ki Suk) 한국콘텐츠학회 2014 한국콘텐츠학회논문지 Vol.14 No.6
한국의 이동통신시장은 이미 경쟁이 치열한 성숙기에 진입했으며, 최근 LTE서비스가 출시되면서 여러 요인으로 인해 이동통신 시장구조가 급격히 변동하고 있다. 따라서 본 연구의 목적은 이러한 시장상황에서 이동통신서비스 이용고객의 상표전환의향 및 상표전환행동이 어떠한 영향이 있는지를 증명하고, 그 시사점을 제시하고자 하였다. 연구결과, 미래창조과학부가 제공하는 전체 스마트폰 가입자 비율과 본 연구가 제시하는 현재 시장점유율은 일치하는 것으로 나타났다. 스마트폰 이용고객의 잠재고객유지율은 SKT > KT > LGU+ 순으로 높게 나타났으며, 이용통신사 전환 선호도도 SKT, KT, LGU+ 순으로 조사 되었다. 본 연구에서 조사된 자료와 상표전환행렬을 활용한 향후 스마트폰 시장의 최종 시장점유율은 SKT 63.65%, KT 21.99%, LGU+ 14.36%로 추정 되었다. 또한 잠재고객유지율이 1년 전에 비하여 큰 폭으로 하락한 것으로 나타나, 스마트폰 시장은 당분간 변동이 심할 것으로 예측되었다. In the Korean mobile market, the mobile phone has reach the stage of maturity in terms of demand. Since the long-term evolution(LTE) service was introduced in 2011, there have been drastic changes in the market structure. The purpose of this paper is to examine the user intension of brand switching, to analyse the market share among 3 major mobile service companies using the brand switching matrix and to provide some insights. The results show that the smartphone subscriber rate provided by Ministry of Science, ICT and Future Planning agrees with the market share by brand switching matrix of this study. The potential rate of costumer retention would be arranges in order of SKT>KT>LGU+. The preference of mobile service company on switch be inorder of SKT>KT>LGU+. The future market share be SKT 63.55%, KT 21.99%, LGU+ 14.36%. The potential rate of costumer retention fell sharply over the past year, suggesting the drastic fluctuations in market share for a while.