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성능평가기법을 활용한 타당성조사 정책적 분석단계의 정량적 의사결정모델 개발 - 복수대안의 타당성 평가를 중심으로 -
임용수,송헌영,정한기,정민철,공정식,Lim, Yong-Soo,Song, Hyun-Young,Jeong, Han-Kee,Jeong, Min-Chul,Kong, Jung-Sik 한국건설관리학회 2011 한국건설관리학회 논문집 Vol.12 No.2
사회간접자본(SOC)은 국가 산업부문과 국민경제에 매우 큰 영향을 끼치는 생산요소로 이에 대한 투자는 경제성장에 있어 필수적이며, 국가 경쟁력을 결정하는 주요 요소이다. 이러한 중요성을 인식하여 정부에서는 지난 1999년부터 예비타당성조사 제도를 도입하여 SOC 사업시행 유 무를 검토하고 있으나 과학적 투자평가방법의 미비, 조사 결과의 신뢰성 저하 등 근본적인 문제가 끊임없이 제기되고 있다. 이를 개선하고자 수행된 주요기관의 선행연구는 대부분 수요추정 및 경제성 분석 중심으로 진행되었고, 예비타당성조사의 주요 단계인 정책적 분석에 대한 연구진행은 아직 미흡한 실정이다. 이에 본 논문에서는 관련 학문과의 적절한 융합과 조화가 요구되는 (예비)타당성조사의 정책적 분석단계에 대하여 현행 전문가의 경험과 관련 자료에 의한 정성적 평가를 개선하고자 가치공학(VE)의 성능평가기법을 활용한 정량적 의사결정모델을 개발 제안하여 분석결과의 정량화를 유도하고 체계적 분석절차에 의한 전략적 판단도구로의 활용과 신규투자사업 목표에 대한 정책적 측면의 가치향상에 기여하고자 한다. As an impactive factor on industries and national economy, The Social Overhead Capital(SOC) is major factor to determine the national competitiveness and the investment of SOC is essential for its economic growth. Accordingly, introduction of the preliminary feasibility study and establishment of legal institutionalization and evaluation system has been carried out and reviewed since 1999. Nevertheless of these efforts, basic problems such as lack of scientific method for investment evaluation and loss of effectiveness on feasibility studies are continuously being brought up. Moreover, as the preliminary study to improve the mentioned problems is mainly focused on the economic and estimated demand analysis, the study of policy analysis, the most important phase during a feasibility study, is still insufficient. Therefore, in this paper, a quantitative decision-making model, to which the performance assessment method of Value Engineering(VE) is applied, is developed and proposed to improve the policy analysis of (preliminary) feasibility study that requires combining with relative studies, to induce quantitative analysis method, and to contribute the improvement of value on the political aspect for SOC investment goals and use as a strategic decision-making method by systematic analysis.
이용진,이수연,송헌영,이재윤,최재진,김원범 한국자원공학회 2021 한국자원공학회지 Vol.58 No.6
In case of the paraffin deposition in the producing oil fields, the flow assurance can be deteriorated leading to decrease in production and inefficient field operation. In this study, to inhibit the paraffin deposition in advance, a customized chemical product was developed by blending the chemical components that can interfere the crystalline growth and disperse the paraffin components in crude oil for the Kazakhstan field. The performance of the product was verified using pour point measurement and cold finger test. Futhermore, by optimizing the performance of the inhibitor through flow simulation the complete product was successfully developed displaying over 90% inhibition rate per 1,000 ppm as targeted. The processes of the development and performance evaluation of the customized product for inhibiting paraffin deposition are presented in this study. 생산유전 현장에서 파라핀 침적이 발생할 경우, 유동안정성이 악화되어, 생산량 저하 및 비효율적인 현장운영 등의 문제를 초래하게 된다. 본 연구에서는 카자흐스탄 지역의 유전 현장 시설물에 파라핀이 침적되는 것을 사전에 억제하기 위해, 문제유정의 원유를 대상으로 원유 내 파라핀 성분의 결정성장을 방해하고 분산시킬 수 있는 화학성분을 조합하여 맞춤형 화학제품을 개발하였다. 개발된 제품의 성능은 유동점 측정, cold finger 실험을 통해 검증하였고, 유동모사시험을 진행하며 억제제의 성능을 최적화함으로써, 개발목표치인 1,000 ppm당 90%이상 억제율을 발휘하는 억제제 시제품을 완성하였다. 이에 파라핀의 침적을 억제하는 맞춤형 화학제품의 개발과 성능평가 과정을 기술하였다.
지반 함몰 복구용 저강도·고유동 충전재로서 기포콘크리트 연구 및 현장적용
마영,김범석,우양이,정경헌,송헌영,Ma, Young,Kim, Beom-Seok,Woo, Yang-Yi,Jung, Kyung-Hun,Song, Hun-Young 한국자원리싸이클링학회 2020 資源 리싸이클링 Vol.29 No.1
The objectives of this study were to identify the optimal mix of foam concrete with the low-strength and high-flow for the repairing ground subsidence situation emergently by utilizing a large amount of industrial by-products and evaluate the possibility by applying it to the site. The factors of the experiment were the mixing ratio of mixing water and a foaming agent and the mixing ratio of foam over paste volume. The optimal mix identified by the experiment was applied to the field and basic properties were evaluated. The results of the experiment showed that the optimal mixing ratio of mixing water and the foaming agent was 10%. Moreover, when the mixing ratio of pre-foam over paste volume was 170%, it satisfied the target. However, to ensure stable quality when applying to the field, the foam mixing ratio was set 140% for the field application. The field application test of foam concrete with the low-strength and high-flow using an eco-friendly binder satisfied all target performances. Therefore, the possibility of using it as a mixture and construction method for a ground repair system is confirmed. However, there was a quality deviation between the upper part and the lower part due to the separation between foam and paste. Consequently, further studies are needed to improve it.
CSA를 사용한 친환경 지반보수용 현장 기포콘크리트의 기초 특성 검토
우양이,박근배,마영,송헌영,Woo, Yang-Yi,Park, Keun-Bae,Ma, Young,Song, Hun-Young 한국자원리싸이클링학회 2020 資源 리싸이클링 Vol.29 No.1
This study aimed to develop a foam concrete material for a ground repair system that has low strength and low fluidity by using an eco-friendly binder, which substitutes industrial by-products for more than 90% of cement. Basic properties were evaluated after substituting a small amount of calcium sulfo aluminate (CSA) for the binder to improve the sinking depth rate and volume change, commonly found when it had a large amount of industrial by-products. The substitution rates of CSA for the eco-friendly binder used for the foam concrete were 2.5, 5, and 10%. Fresh properties, hardened properties, pore structure, and hydrates were analyzed. Experimental results showed that using only 2.5% of CSA could improve the deep sinking depth which occurred when using an eco-friendly binder. As a result, the weight difference between the upper, middle, and lower parts of cast specimens was improved even after being hardened. The addition of CSA also contributed to the formation of small, uniformly sized closed pores and improved initial strength. However, when the proportion of CSA increased, the long-term strength decreased. However, it satisfied the target strength when 5% or less of CSA was used. The results of this study revealed that it was possible to manufacture foam concrete with low strength and high fluidity for repairing ground satisfying target qualities by adding 2.5% of CSA to the eco-friendly binder containing a large amount of industrial by-products.