Jacket Anchor 공법을 이용한 지반 Anchor 소개

이규상,김만수,Lee, Gyu-Sang,Kim, Man-Su 한국건축구조기술사회 2006 건축구조 Vol.13 No.3

항공유 오염 지역에서 주입정과 회수트렌치를 이용한 원위치 토양세정법 현장 적용

이규상,김양빈,장재선,엄재연,송성호,김을영,Lee, Gyu-Sang,Kim, Yang-Bin,Jang, Jae-Sun,Um, Jae-Yeon,Song, Sung-Ho,Kim, Eul-Young 한국지하수토양환경학회 2012 지하수토양환경 Vol.17 No.1

This study reports a surfactant-enhanced in-situ remediation treatment at a test site which is located in a hilly terrain. The leakage oils from a storage tank situated on the top of the hill contaminated soils and groundwater in the lower elevation. Sixteen vertical injection wells (11 m deep) were installed at the top of the hill to introduce 0.1-0.5 vol.% of non-ionic Tween-80 surfactant. The contaminated area that required remediation treatment was about $1,650\;m^2$. Two cycles of injecting surfactant solution followed by water were repeated over approximately 7.5 months: first cycle with 0.5 month of surfactant injection followed by 3 months of water injection, and second cycle with 1 month of surfactant followed by 3 months of water injection. The seasonal fluctuation in groundwater table was also considered in the selection of periods for surfactant and water injection. The results showed that the initial Total Petroleum Hydrocarbon (TPH) concentration of 1,041 mg/kg (maximum 3,605 mg/kg) was reduced significantly down to 76.6 mg/kg in average. After 2nd surfactant injection process finished, average TPH concentration of soils was reduced to 7.5% compared to initial concentration. Also, average BTEX concentration of soils was reduced to 10.8%. This resultes show that the surfactant enhanced in-situ remediation processes can be applicable to LNAPL contaminated site in field scale.

지하암반 냉동저장고 주변의 온도분포 예측을 위한 수치해석

이규상(Gyu-Sang Lee),이정인(Chung-In Lee) 한국암반공학회 2004 터널과지하공간 Vol.14 No.4

지하암반 냉동저장고 주변의 온도분포를 예측하기 위하여, FLAC을 이용한 2차원 및 3차원 수치해석을 수행하였다. 수치해석 수행 시 암반 열물성에 대한 지하수 및 동결잠열의 영향을 고려하였으며, 2차원 및 3차원 수치해석 결과와 5년간의 지하암반 온도계측 자료를 비교하였다. 2차원 수치해석 결과 실험실 물성을 이용한 경우는 계측 결과와 큰 오차를 나타내었으며, 지하수 부피비 20% 및 동결잠열을 고려한 수치해석 결과가 계측 결과와 가장 작은 오차를 나타내었다. 하지만, 냉동기 가동시간이 증가하면서 지표면으로의 열 유동의 영향으로 커지는 오차는 커지는 경향을 나타내었다. 지표면의 영향을 고려하는 3차원 수치모델을 정립하여 수치해석을 수행한 결과, 지하수 및 동결잠열의 영향을 고려한 수치모델이 계측 결과가 잘 일치하는 경향을 나타내었다. To predict the temperature distribution around a underground rock storage cavern, two- and three-dimensional numerical analysis using FLAC was conducted. The effects of groundwater and latent heat on thermal properties were considered in numerical calculation. The temperature estimated by FLAC are compared with the temperature measured for 5-year operation at Gonjiam storage cavern. Estimated and measured temperatures showed great discrepancy when thermal properties from laboratory tests were used and showed good agreement when the effects from 20% of volumetric water fraction and latent heat were considered. However, the discrepancy still increased with operation time due to the heat flow from ground surface. Three-dimensional numerical models were established to closely approximate the boundary condition of the test site, and numerical results better agreement when groundwater and latent heat effects were considered.

곤지암 지하암반 저장고 온도계측 결과 분석

이규상(Gyu-Sang Lee),이정인(Chung-In Lee) 한국암반공학회 2005 터널과지하공간 Vol.15 No.3

경기도 광주군에 건설된 상업적 규모의 지하임반 저장고인 ‘곤지암 지하암반 저장고’ 에 대한 약 7년간 운영중에 측정된 결과를 분석하였다. 운영 초기에 투입되었던 에너지와 저장고 주변의 온도가 안정화된 이후의 에너지를 비교하여 에너지 소비의 변화경향을 분석하였다. 초기 냉동기 설계에 필요한 용량과 저장고 운영에 필요한 냉동기 용량을 비교하여 초기 냉동시스템 설계 시 고려할 점에 대해 논하였다. 7년간 암반 내 지중온도 변화 양상을 분석하여, 암반 내 지하수가 동결될 때에 소요되는 추가적인 에너지에 대해 논하고, 현재 암반온도 분포 상황을 초기의 온도분포를 예측한 FLAC 수치해석 결과와 비교하였다. 냉동기 가동시간에 따른 투입된 열유량과, 2차원, 3차원 수치해석에 의한 열유량을 비교하여 수치해석에 의한 열유량 예측의 정확성에 대해 논하였다. The decreasing pattern of underground temperature measured at 'Gonjiam cold storage cavern' during 7 years which was the first commercial scale underground food storage cavern in Korea was analyzed. The variation of energy consumption was discussed by comparing the consumed energy at the initial operation stage with that at later stage, when the temperature distribution reached a stabilized condition. The point to be considered at the design stage was also discussed by comparing the required refrigerator capacity at the initial operation stage with that at later stage. The extra energy to freeze the groundwater contained in pore space was discussed by analyzing the changing pattern of the rock temperature. The variation of measured rock temperature was compared with the estimated temperature using a numerical code, FLAC. The accuracy of the numerical estimation was discussed by comparing the heat flux measured by the operation time of the refrigerator with that estimated numerically.

혼합전략에 따른 계획 및 통제시스템의 이용이 조직성과에 미치는 영향

이규상 ( Gyu-sang Lee ),이상완 ( Sang-wan Lee ),김순기 ( Soon-kee Kim ) 한국회계학회 2016 회계저널 Vol.25 No.4

본 연구는 제조기업을 대상으로 혼합전략이라는 상황요인과 PCS의 상호작용적 이용, 그리고 조직성과 간의 관계를 검증했다. 최근 기업들은 다양해진 고객의 요구 만족과 경쟁우위의 달성을 통한 조직성과의 증진을 위해 전략적 다각화를 꾀하고 있는 추세이다. 하지만 관리회계연구의 관심은 여전히 순수전략에 머물러 있다. 따라서 본 연구는 혼합전략에 초점을 맞추어, 그에 적합한 PCS 이용방식의 지원이 조직성과에 미치는 영향에 대해 검증하였다. 전략적 우선순위를 기반으로 원가우위전략, 차별화전략, 그리고 혼합전략을 분류하여 PCS의 이용방식과 관계를 분석한 결과, 순수전략에 비해 혼합전략에서 PCS를 더욱 상호작용적으로 이용함을 밝혔다. 또한 혼합전략과 PCS의 상호작용적 이용방식 간 정합성이 장기적 성과로 간주되는 비재무성과를 증진시키는 것으로 나타났다. 추가적으로 전략적 상황요인에 기반한 PCS의 설계에 있어 기존 선행연구들이 제시하지 못한 차별화전략과 혼합전략 간 차이의 존재 및 그에 따른 조직성과에 대한 효과성의 실증적 증거를 제시하였다. 즉, 혼합전략에서 PCS의 상호작용적 이용정도는 차별화전략에서의 그 이용정도보다 높음을 제시하고, 이는 비재무성과의 증진으로 나타남을 실증적으로 검증한 것이다. Management accounting research based on contingency theory asserts that there is no only MCS fits for whole contingency factors. Therefore, MCS should be designed to be appropriate for firms`` situation. In this research, we posit that organizational performance can be improved when the designed MCS suits for the organizational circumstances. In recent years, firms tend to pursue diversification of strategies for improvement of organizational performance through satisfying customers`` needs and achieving competitive priorities. Thus, firms try to take a mixed strategy, which makes use of diverse strategic priorities. However, management accounting research mostly focused on archetypal strategies conventionally in terms of their effect of designing or using MCS. In addition, these research examined the only association PMS with differentiation strategy which is proxied by limited strategy and MCS. In the stream of strategy research, necessity of research on the mixed strategy is emphasized as firms choose a variety of strategies rather only one archetypal strategy to deal with dynamic business environments nowadays. Nevertheless, these prior studies has not illuminated the importance of the fit between mixed strategy and use of MCS. Furthermore, they rarely present the empirical evidences on how the fit between mixed strategy and use of MCS affect organizational performance. In this respect, this research defines the form of strategy with strategic priorities focusing on mixed strategy, and examines the association of mixed strategy as contingency factor, interactive use of PCS, and organizational performance for manufacturing firms. The results of this study are summarized as follows. The firm which take mixed strategy are likely to use the PCS more interactively compared to those under archetypal strategy. Also, when the PCS is used interactively, the difference of non-financial performance between firms with only one archetypal strategy and those with mixed strategy seems to get bigger. This result implies that interactive use of PCS is appropriate for mixed strategy which makes firms`` situation more complicated, and fitness of mixed strategy and interactive use of PCS improves the organizational performance, partially. Additionally, in the aspects of designing PCS, this study suggest that differences between differentiation and mixed strategy, and effect to organizational performance which could not be examined in prior researches. That is, we examine that the degree of interactive use of PCS in mixed strategy is higher than differentiation strategy, and it makes the improvement of organizational performance. The contribution of this study to management accounting research is threefold. First, our study measured the mixed strategy empirically by using strategic priorities. This point can suggest expanded sight to prior research which measured the strategy conventionally with low cost and differentiation or prospector and defender by proxy. Second, results of this study contribute to the design of PCS literature by verifying the level of distinction of interactive use between differentiation and mixed strategy. Existed research has limitation that it cannot illuminate the importance of interactive use of PCS in firms making use of mixed strategy, but only emphasizing it in firms making use of differentiation strategy. Third, our study suggested the empirical evidence which the fitness of mixed strategy and interactive use of PCS could be effective to organizational performance positively. Existed research only had emphasized the alignment of strategy and control system in the aspect of MCS design, but it overlooked the effect of fitness to organizational performance. The results of this study are subject to a number of limitations as follow. First, the total number of samples is too small. Thus, the sample number of each strategic clusters is small, too. It makes the limitation that the representativeness of each strategic cluster is hard to being defined. Second, a cross-sectional study can only provide presumptive evidence about causality. Alternative methods may provide more information about directional relationship. Third, methodologically speaking, as a mixed strategy can be defined diversely, it can be measured by alternatively. That is, mixed strategy is defined by using a form of archetypal strategy. It can be measured by using strategic priorities of prospector and defender by proxy. Thus, expanded research which is measured the mixed strategy being based on it. This point can be applied to defining or measuring the MCS by alternative proxies.

금속성 안료 사출성형 제품의 불순물 혼입에 관한 연구

이규상(Gyu-Sang Lee),손병훈(Byung-Hun Son),진동현(Dong-Hyun Jin),곽재섭(Jae-Seob Kwak) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11

Injection molding process is widely used for producing most plastic products. In order to make a metal-colored plastic product especially in modern luxury home alliances, metallic pigments which are mixed to a basic resin material for injection molding are available. However, the process control for the metal-colored plastic product is extremely difficult due to non-uniform melt flow of the metallic resin pigments. In this study, the effect of process parameters on a quality of the metal-colored plastic product is evaluated. A rapid mold cooling method by a compressed cryogenic fluid is also proposed to decrease undesired compound contents within a plastic product.

제주도 표선유역의 물수지 평가를 위한 지하수 유동 모델링

송성호 ( Sung Ho Song ),이규상 ( Gyu Sang Lee ),안중기 ( Jung Gi An ),전선금 ( Sun Geum Jeon ),이명재 ( Myung Jae Yi ) 한국환경과학회 2015 한국환경과학회지 Vol.24 No.4

To estimate water balance of Pyosun watershed in Jeju Island, a three-dimensional finite difference model MODFLOW was applied. Moreover, the accuracy of groundwater flow modeling was evaluated through the comparison of the recharge rate by flow modeling and the existing one from water balance model. The modeling result under the steady-state condition indicates that groundwater flow direction was from Mt. Halla to the South Sea and groundwater gradient was gradually lowered depending on the elevation. Annual recharge rate by the groundwater flow modeling in Pyosun watershed was calculated to 236 million m3/year and it was found to be very low as compared to the recharge rate 238 million m3/year by the existing water balance model. Therefore, groundwater flow modeling turned out to be useful to estimate the recharge rate in Pyosun watershed and it would be available to make groundwater management policy for watershed in the future.

해수침투지역에서 1차원 전기비저항 탐사 자료의 공간분석

송성호,이규상,김진성,성백욱,박남식,홍성훈,Song Sung-Ho,Lee Gyu-Sang,Kim Jin-Sung,Seong Baek-Uk,Park Namsik,Hong Sung-Hun 한국관개배수위원회 2005 한국관개배수논문집 Vol.12 No.1

Although experimental analysis for groundwater sample at wells located systematically are very effective to delineate seawater intrusion region at coastal area, this method is restricted in few wells and time. We have conducted electrical resistivity soun

특별세션 : 유출특성을 고려한 제주도 표선유역 산간지역의 물수지 분석

송성호 ( Sung Ho Song ),안중기 ( Jung Gi Ahn ),이규상 ( Gyu Sang Lee ) 대한지질공학회 2014 대한지질공학회 학술발표회논문집 Vol.2014 No.1

유출특성을 고려한 산지지역의 물수지 평가 -제주도 표선유역을 중심으로-

송성호 ( Sung Ho Song ),안중기 ( Jung Gi An ),이규상 ( Gyu Sang Lee ) 한국환경과학회 2015 한국환경과학회지 Vol.24 No.4

The grid-based water balance of watershed scale was assessed in the mountainous area of Pyosun catchment in Jeju Island after analyzing precipitation, evapotranspiration, and runoff from January 2008 to December 2013. The existing results of direct runoff, evapotranspirtion, and groundwater recharge comparing to precipitation were presented 22.0%, 25.6%, and 52.4%, respectively, in Pyosun catchment. However, this study indicated each component shows 14.5%, 24.2%, and 61.0%, respectively, in the mountainous area of Pyosun catchment. Therefore, groundwater recharge rate in the mountainous area appears higher than 10% comparing to the overall catchment. It would be analyzed that the amount of direct runoff is relatively small. Moreover, this difference could be generated because of the spatial discontinuities in the process of estimating the total amount of precipitation in the mountainous area. Therefore, the grid-based spatial analysis to maximize the spatial continuity would be useful for providing a more reasonable result when the total amount of water resources are evaluated in mountainous areas in the future.