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운전절차 합성을 위한 제약조건 전파 기반의 통합 프레임워크
황규석,허보경 한국화학공학회 2001 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.39 No.3
화학공장의 운전절차 자동 합성은 공장 안전을 향상시킬 뿐 아니라 설계 비용을 줄여 주지만 기존 방법들은 조작에 의한 공정상태의 변화를 모사하는 방법, 운전목표 달성에 필요한 조작과 중간목표의 선택 방법에 많은 한계를 가지고 있다. 따라서 본 연구에서는 목표사이의 복잡한 상호작용으로 인한 조작선택의 어려움을 해결하고 공정지식을 보다 효과적으로 표현하기 위해 필요한 제약조건 전파 기반의 통합 프레임워크를 제안하였다. 제안된 방법론은 중간목표사이의 상호작용이 매우 심한 공정에 적용하여 그 유효성을 입증하였다. The automatic synthesis of operating procedures for chemical plants improves plant safety and reduces design costs. However, the existing operating procedure synthesis techniques have limitations in simulating a change of process states by the operation and selecting operations and subgoals needed to achieve the operational goal. So in this study, we have proposed the integrated framework based on constraint propagation to resolve problems about operation selection due to subgoal interaction among subgoals and to effectively use the process knowledge. The proposed methodology has been successfully applied to the process with serious subgoal interaction.
황규석,허보경,안대명 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.6
보일러 플랜트의 운전관리 미숙(오조작, 오판단)으로 인해 발생하는 shutdown을 예방하기 위한 운전 지원용 전문가 시스템을 개발하였다. 본 연구에서는 대상공정 과 거동에 대한 symbolic modeling을 실시하고, 조작에 비한 공정상태 변화의 모사방법과 상황 의존적인 문제를 해결하는 방법을 제안하였다. 또한, 위험상황과 운전상황의 인식에 필요한 지식 을 일반화하여, 오판단과 오조작으로 인한 보일러의 이상상태를 조작에 미리 앞서서 예측할 수 있는 방법을 제시하였다. 개발된 시스템을 실제 공성에 적용하여 제시한 방법이 유용한 것임을 검증하였다. An operation aiding expert system is developed for preventing an unexpected shutdown caused by operation errors or misjudgements in boiler plants. Based on symbolic model about the plant structure and the behavior characteristics, the change of process states is simulated. And the method for solving context-dependent problem is suggested. With generalized knowledges for the recognition of operational situations and hazardous conditions, a strategy is suggested for anticipating accidents caused by operation errors or misjudgements in advance. By the results of the application of this system to the real plant, it is shown that the methodology suggested in this study is useful.
화학공정의 위험상태 인식을 위한 지식 표현에 관한 연구
황규석,안대명 한국산업안전학회 1996 한국안전학회지 Vol.11 No.3
A system was developed that could predict hazardous states for safe operation of chemical plants. This system aimed to prevent hazards of chemical processes from misoperation before real operation. In this study, a data base was organized which consisted of all hazards in the chemical processes. The structure of process was represented by signed direct graph(SDG) of NODEs and ARCs. Each NODE and ARC have property variables ; connected structure and state of processes etc. The hazards that could be occurred in processes were divided into two classes ; one is by operation of unit and the other is by hazardous materials. Using Hazardous States Transition Network, we could recognize transition progress of process states.
황규석,김병훈,안준형,강보안,Yeon-Hum Yun,Young-Sun Jeon 한양대학교 세라믹연구소 2004 Journal of Ceramic Processing Research Vol.5 No.2
Glass-ceramics showing a high mechanical strength reinforced by whisker-type wollastonite crystals were prepared by a milling and heat-treatment process using various glass waste and shells as starting materials. In order to blend the starting materials and to accelerate the interaction between the glass and shell during annealing, mechanical milling using a disk-type mill was employed. Formation of whisker-type β-wollastonite crystals was observed in the glass matrix using a X-ray diffraction analysis and a field emission-scanning electron microscope. On increasing the annealing temperature from 800oC and 900oC to 1000oC, the compressive strength of the specimens increased.
황규석,윤정한,김치균,윤연흠 한국자원리싸이클링학회 2004 資源 리싸이클링 Vol.13 No.1
Wollastonite-type glass ceramics were prepared by milling and firing at various temperatures using an automobile waste glass and waste shell as starting materials. Powder mixture ground by disk-type ball mill for 3 hours was pressed into a disk. The pressed specimen was fired at 850C, 950C and 1050C for 1 hour in air. From FE-SEM observation, with an increase of the firing temperature from 850C to 1050C, whisker-type phase was grown to about 10 m in length. Specimen fired at 1050C showed the formation of well-crystallized whisker-type wollastonite grains and the highest compressive strength.
스핀코팅으로 금속물질을 도핑한 TiO<sub>2</sub>박막의 광학적 특성
황규석,김재민,정주현,Hwang, Kyu-Seong,Kim, Jai-Min,Jung, Ju-Hyun 한국안광학회 2007 한국안광학회지 Vol.12 No.1
Ti-나프텐산염과 금속을 출발원료로 사용하고, 스핀코팅-열분해법을 이용하여 실리카 유리위에 박막을 제조하였다. 도포된 박막은 $500^{\circ}C$ 공기에서 10min동안 열처리하였다. 이를 5회 코팅한 박막은 마지막으로 공기에서 $600^{\circ}C$에서 30min으로 하였다. 박막의 특성을 분석하기 위하여 X-선 회절 분석, 전자현미경, UV스펙트럼을 이용하여 분석하였다. 밴드갭에서 가장 큰 장파장 쪽으로 이동은 Fe을 도핑한 $TiO_2$ 박막이었다. Metal-doped $TiO_2$ thin films were prepared on soda-lime-silica glass substrates by using a spin coating-pyrolysis process. As-deposited films were prefired at $500^{\circ}C$ or 10 min in air. Five-coated films were finally annealed at $600^{\circ}C$ for 30 min in air. High resolution X-ray diffraction, field emission scanning electron microscope and UV spectrophotometer were used to analyze film's property. The largest red shift in optical energy gap is obtained in the Fe-doped $TiO_2$ film.
졸-겔법을 이용한 $(Ba_{1-x}Sr_x)TiO_3$ 박막의 제조 및 특성
황규석,김병훈 한국세라믹학회 1995 한국세라믹학회지 Vol.32 No.4
In this study, to prepare the dielectric (Ba, Sr)TiO3 thin films by the sol-gel process, Titaminum (IV) sio-propoxide (Ti[OCH(CH3)2]4), Ba and Sr acetate were used for sol and thin films were prepared by dip-coating process. Stability of sol decreased with the increase of Sr, and thickness of thin films were obtained 0.13~0.17${\mu}{\textrm}{m}$ by 1 coating cycle. Transmittance of amorphous thin films heated at 500 and 55$0^{\circ}C$ was very good, and crystallization tendency of thin films according to heat-treatment temperature and crystallization characteristics of thin films heated at 11$0^{\circ}C$ for 3 hrs were analysed. As a result, good perovskite structure was obtained higher than 100$0^{\circ}C$, and tetragonality of thin film was decreased but pyrochlore was formed with increasing Sr. In case of addition to substitute 0.4mol% Sr for Ba, dielectric constant was 288 and loss factor (tan $\delta$) was 0.04.
Adsorption of carbon dioxide onto PDA-CP-MS41 adsorbent
황규석,박상욱,Lina Han,박대원,오광중,김성수 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.1
Carbon dioxide was adsorbed onto mesoporous adsorbent of PDA-CP-MS41, which was synthesized by CP-MS41 with propylene diamine, in a laboratory-scale packed-bed. Experiments were carried out at different adsorption temperatures (30-60 oC), amounts of adsorbent (1-3 g), and flow rates of nitrogen (15-60 cm3/min) to obtain the breakthrough curves of CO2. These curves were tested by the deactivation model, which combined the adsorption of CO2and the deactivation of adsorbent particles. The adsorption rate constant and the deactivation rate constant were evaluated through analysis of the experimental breakthrough data using a nonlinear least squares technique. The experimental breakthrough data were fitted very well to the deactivation model than the adsorption isotherm models in the literature.