• 한국식물생명공학회:학술대회논문집
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• 한국식물생명공학회 2003년도 추계학술대회 발표논문 초록집
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• pp.109-109
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• 2003

• 한국대기환경학회지
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• 제13권4호
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• pp.257-267
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• 1997

This study focuses on the health risk assessment of airborne volatile organic compounds (VOCs) in a petrochemical complex, with several emphases on a risk assessment method. The first emphasis is on the importance of hazard identification to determine the likely carcinogenic potential of a VOC. Without considering this type of information, a direct comparison of the carcinogenic risks of two pollutants is meaningless. Therefore, wer suggest that this type of information be prepared and be listed with the estimate of cancer risk in parallel. The second emphasis is on the selection of a better dose-response model to estimate unit risk or cancer potency factor of a carcinogenic VOC. Finally, probilistic risk assessment method is discussed and recommended to use within a comparison of conventional point-estimate method. A health risk assessment has also been carried out. For non-carcinogenic risk, even the highest hazard index for carbon tetrachloride is estimated to be less than 1 with the other VOCs less than 0.03. However, the lifetime cancer risk from the inhalation of airborne VOCs is estimated to be about $2.6 \times 10^{-4}$ which is higher than the risk standard of $10^{-6}$ or even $10^{-5}$. Therefore, the investigation into domestic petrochemical complexes should be strengthened to obtain more fine long-term airborne VOC data.

• 폴리머
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• 제38권4호
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• pp.449-456
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• 2014

Ternary blends of poly(L-lactic acid) (PLLA), poly(${\varepsilon}$-caprolactone) (PCL) and polyethylene oxide (PEO) were produced with different concentrations of components via melt blending. By leaching the PEO from the samples by water, porous materials were obtained with potential application for bio scaffolds. Sample porosity was evaluated by calculating the ratio of porous scaffold density (${\rho}^*$) to the non-porous material density (${\rho}_s$). Highest porosity (51.42%) was related to the samples containing 50 wt%. of PEO. Scanning electron microscopy (SEM) studies showed the best porosity resulted by decreasing PLLA/PCL ratio at constant concentration of PEO. Crystallization behavior of the ternary blend samples was studied using differential scanning calorimetry (DSC). Results revealed that the crystallinity of PLLA was improved by addition of PEO and PCL to the samples. The porosity plays a key role in governing the compression properties. Mechanical properties are presented by Gibson-Ashby model.

• 대한기계학회논문집B
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• 제26권11호
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• pp.1578-1584
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• 2002

Combustion stability is one of the most important factors that must be considered in burning of heavy fuel oil, especially low-grade oil. This paper describes the combustion characteristics of petrochemical process by- product in the combustion furnace of heavy fuel oil. Main experimental parameters were combustion load, excess 02, fuel preheating temperature and air/fuel ratio. The capacity of CRF(combustion research facility) used in this study was 1.0 ton/hr and the burner is steam jet type suitable far heavy oil combustion and manufactured by UNIGAS in Italy. The fuel used in this experiment were 0.5 B-C, petrochemical process by-product and 3 kinds of 0.5 B-C/process by-product mixtures. The combustion stability was monitored and exhaust gases such as CO, NOx, SOx and particulates were measured with the excess $O_2$ and combustion load. The main purpose of this study is to clarify whether process by-product can be used as a boiler fuel or not in consideration of flame stability and emission properties.

• Journal of Plant Biotechnology
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• 제4권2호
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• pp.53-58
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• 2002

Adverse environmental conditions such as drought, high salt and cold/freezing are major factors that reduces crop productivity worldwide. According to a survey, 50-80% of the maximum potential yield is lost by these "environmental or abiotic stresses", which is approximately ten times higher than the loss by biotic stresses. Thus, improving stress-tolerance of crop plants is an important way to improve agricultural productivity, In order to develop such stress-tolerant crop plants, we set out to identify key stress signaling components that can be used to develop commercially viable crop varieties with enhanced stress tolerance. Our primary focus so far has been on the identification of transcription factors that regulate stress responsive gene expression, especially those involved in ABA-mediated stress response. Be sessile, plants have the unique capability to adapt themselves to the abiotic stresses. This adaptive capability is largely dependent on the plant hormone abscisic acid (ABA), whose level increases under various stress conditions, triggering adaptive response. Central to the response is ABA-regulated gene expression, which ultimately leads to physiological changes at the whole plant level. Thus, once identified, it would be possible to enhance stress tolerance of crop plants by manipulating the expression of the factors that mediate ABA-dependent stress response. Here, we present our work on the isolation and functional characterization of the transcription factors.n factors.

• Korean Chemical Engineering Research
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• 제45권1호
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• pp.25-31
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• 2007

석유화학단지내에서 석유화학공장과 정유공장과 같은 산업현장에서는 상당량의 수소가 부산물로 발생되고 있으나, 이는 대부분 자체적으로 연료로 사용되고 있다. 그러나 연료로 사용되는 상당량의 수소를 에너지원의 원료나 기타 공정의 원료로 재활용할 경우, 현재보다 수소의 가치를 높여서 사용할 수 있다. 본 연구에서는 석유화학단지내 공장간 수소 재활용 네트워크를 설계하였다. 수소 핀치 분석을 통하여 교환망 구성에 필요한 최소의 수소 요구 및 정제량을 파악하고, 네트워크 구성에 필요한 비용과 기타 제약 조건으로 최적화 문제를 구성하여 공급처(source)와 수요처(sink) 공장간에 최적으로 수소를 재활용하기 위한 네트워크를 설계하였다.

• Steel and Composite Structures
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• 제49권4호
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• pp.407-417
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• 2023

After a disaster like the catastrophic earthquake, the government have to use rapid assessment of the condition (or damage) of bridges, buildings and other infrastructures is mandatory for rapid feedbacks, rescue and post-event management. Many domain schemes based on the measured vibration computations, including least squares estimation and neural fuzzy logic control, have been studied and found to be effective for online/offline monitoring of structural damage. Traditional strategies require all external stimulus data (input data) which have been measured available, but this may not be the generalized for all structures. In this article, a new method with unknown inputs (excitations) is provided to identify structural matrix such as stiffness, mass, damping and other nonlinear parts, unknown disturbances for example. An analytical solution is thus constructed and presented because the solution in the existing literature has not been available. The goals of this paper are towards access to adequate, safe and affordable housing and basic services, promotion of inclusive and sustainable urbanization and participation, implementation of sustainable and disaster-resilient buildings, sustainable human settlement planning and manage. Simulation results of linear and nonlinear structures show that the proposed method is able to identify structural parameters and their changes due to damage and unknown excitations. Therefore, the goal is believed to achieved in the near future by the ongoing development of AI and control theory.

• 한국융합학회논문지
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• 제8권12호
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• pp.307-315
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• 2017

본 연구는 우리나라 석유화학산업의 미래 전략 수립을 목적으로 미래이슈 발굴을 위한 탐색적 프로세스와 분석을 진행하였다. 연구방법으로서 문헌조사와 함께 STEPPER 분석기법을 활용하여 국내 업계, 학계, 연구계 등 대표적인 전문가들을 대상으로 심층적인 설문조사를 병행함으로써 융합적 시각에서 한국 석유화학산업의 이머징 이슈를 도출했다. 또한 2040년까지 새롭게 떠오르고 있는 트렌드와 이머징 이슈들을 미래이슈분석기법과 전문가 인터뷰를 통해 추출하였다. 이를 통해 미래에도 적용 가능한 변화요인으로서 국제유가 변화, 중국경제 전망, 그리고 미래핵심소재 개발 등 3개 요인들을 확정하였다. 향후 이러한 연구 프로세스를 기반으로 석유화학산업 뿐만 아니라 철강, 자동차, 조선 등 다양한 산업의 미래 시나리오 전략을 위한 연구가 가능할 것이다.

• 폴리머
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• 제34권1호
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• pp.69-73
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• 2010

Effects of reaction time and temperature on the isomerization and dehydrobromination reactions of brominated butyl rubber were investigated. The structural composition of brominated butyl rubber was determined by Fourier transform infrared spectroscopy (FT-IR) and proton nuclear magnetic resonance spectroscopy($^1H$-NMR), Density functional theory (DFT) was used to study on the isomerization and dehydrobromination mechanisms of model compounds. The geometries for model compounds of 3-bromo-5,5,7,7-tetramethyl-2(2',2',4',4'-tetramethyl)pentyl-1-octylene (3BrOE), 1-bromo-5,5,7,7-tetramethyl-2(2',2',4',4'-tetramethyl)pentyl-2-octylene (1Br2OE) and 5,5,7,7-tetramethyl-2(2',2', 4',4'-tetramethyl)pentyl-1,3-octadiene (CD) had been optimized by using density functional theory at B3LYP/3-21G and B3LYP/6-31G levels. The predicted energy of 3BrOE lies higher than that of 1Br2OE which suggests that 1Br2OE configuration is more stable than the 3BrOE configuration. Compared with the energy barrier, the pathway of dehydrobromination is less competitive than that of isomerization. This is qualitatively consistent with the experimental results.

• 한국항만경제학회지
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• 제31권1호
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• pp.127-145
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• 2015

석유화학산업은 대규모 설비 투자비용이 소요되는 자본 및 기술집약적 장치산업으로 공급사슬 내 구성원 간의 협력과 통합을 통한 경쟁력 강화를 추구하고 있어 입지선정시 공급업체와 생산업체, 고객의 지리적 위치와 연결성을 고려한 물류요인이 중요해지고 있다. 따라서 본 연구에서는 다중적 의사결정 기준을 반영하여 입지 선정요인의 상대적 중요성을 평가하고 그 중에서 물류요인의 중요성의 분석 및 국내 주요플랜트 입지 후보지를 평가하는 것을 목적으로 한다. 본 연구는 석유화학플랜트 입지선정 요인의 우선순위를 연구함에 있어 물류적 요인이 다른 산업경제학적인 요인과 비교하여 어떠한 중요성을 가지는지 분석한 연구로서 의의가 있다. 또한 도출된 상대적 중요성을 바탕으로 현재 석유화학단지의 입지를 평가했다는데 의의가 있다. 이는 석유화학기업들이 향후 플랜트 입지를 신규로 선정할 경우 물류적인 요인을 중요하게 고려해야 할 것이며, 정부나 지방자치 단체가 석유화학단지를 조성하거나 유치할 경우 물류비, 물류연계성과 같은 물류적인 기반이 확보되어야 한다는 시사점을 제공할 수 있다.