• 유기물자원화
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• 제12권3호
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• pp.126-133
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• 2004

본 연구는 복합형공정을 이용한 고농도 양돈폐수의 유기물 및 질소 인 제거율을 검토하기 위한 것으로 단일 SBR공정과 복합형 공정을 각각 Run I(SBR), Run II(Struvite Tank - SBR)로 명명하고 고도처리 반응기의 유무에 따른 각 Run별 처리효율을 비교하였다. 각 Run별 유기물 제거율을 살펴보면 Run I의 경우 TS 제거율은 43%, VS 제거율은 39%, SS 제거율은 88%, COD 제거율은 70%이고 Run II의 TS 제거율은 52%, VS 제거율은 52%, SS 제거율은 88%, COD 제거율은 82 %으로 struvite tank가 설치된 Run II의 유기물 제거율이 더 높았다. 또한 각 Run별 암모니아와 T-P제거효율은 Struvite Tank를 설치한 Run II의 암모니아와 T-P의 제거율이 각각 90%와 57%로, Run I의 56 %와 49%보다 효율이높았다. 특히 암모니아의 경우 Run II가 Run I 보다 매우 높은 효율을 보였으며, Struvite Tank의 설치가 질소와 인의 제거에 매우 효율적인 공정임을 알 수 있었다. 따라서 본 실험 결과 고도처리반응기(Struvite Tank)와 SBR(Sequencing Batch Reactor)을 조합한 복합형 공정이 고농도의 양돈폐수처리에 매우 적합한 공정으로 판단되어진다.

• 전기학회논문지P
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• 제66권3호
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• pp.110-116
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• 2017

System to automate the trial-run of energy storage system for frequency regulation was developed and demonstrated. Basic strategy was developed on the basis of trial-run procedure and verified in the computer simulation tool. The algorithm was developed and coded for 4MW trial-run automation system. 4MW trial-run automation system was connected to 4MW energy storage system for frequency regulation in Jocheon substation of Jeju city and demonstrated. 24MW trial-run automation system was developed on the basis of 4MW trial-run automation system and verified by operation system for 24MW energy storage system for frequency regulation. The operation system has own simulation model of energy storage system and power system. The verification was performed to improve the system in the view of user. 24MW trial-run automation system was demonstrated in 32MW Ul-san and 36MW Non-gong energy storage system. All tests of trial-run was done by manual and first they ware taken 1 week with no trial-run automation system. The manual trial-run tests were taken by maximum three times. Trial-run test by trial-run automation system was taken 2 days. The system helps reduce the trial-run test period and improve the accuracy of tests.

• 품질경영학회지
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• 제38권2호
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• pp.190-201
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• 2010

This research proposes a method for designing VSI (Variable Sampling Interval) control charts with supplementary run rules. The basic idea is to apply various run rules and the VSI scheme to a control chart in order to increase the sensitivity. The sampling process of the VSI run rules chart is constructed by Markov chain approach. A procedure for designing the VSI run rules chart is proposed based on Lorenzen and Vance's model. Sensitivity study shows that the VSI run rules charts outperform the FSI (Fixed Sampling Interval) run rules charts for wide range of process mean shifts. A major advantage of the VSI run rules chart over other charts such as CUSUM, EWMA, and adaptive charts is it's simplicity in implementation. Some useful guidelines are proposed based on the sensitivity study.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2004년도 추계학술대회 논문집
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• pp.92-96
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• 2004

In this paper, polishing method using bonded magnetic abrasive particle has been applied to the micro mold polishing. Through process control using the Run-to-Run control, it tried to form the surface roughness In order to grasp the influence of the surface roughness which is reached by selection of control factor and the factor, a design of experiment was been processed. The study is processed with a purpose of to embody and to maintain the surface roughness of nano scale by the basis of an influence between a control factor and the factors which has been selected in this way. As a result, the result of the process control converged at a target value of surface roughness Ra 10nm and Rmax 50nm

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.519-524
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• 2005

A numerical process to simulate SiO2 dry etching with inductively coupled C2F6 plasmas has been constructed using a commercial CFD code as a first step to design a run-to-run control system. The simulator was tuned to reasonably predict the reactive ion etching behavior and used to investigate the effects of plasma operating variables on the etch rate and uniformity. The relationship between the operating variables and the etching characteristics was mathematically modeled through linear regression for future run-to-run control system design.

• KSBB Journal
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• 제14권5호
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• pp.621-627
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• 1999

용량 450 L의 음식물 쓰레기 퇴비화 장치를 설계하여, 유입공기량, 교반, 접종 조건에 변화를 주어 퇴비화 장치의 성능을 실험하였다. RUN 1은 1일 2회 5분간 교반하고, 유입공기량을 22.7 L/min로 고정하였다. RUN 2, 3에서는 지속적으로 교반하고, 유입공기량은 퇴비내부의 온도를 5$0^{\circ}C$ 이상 유지하고, 또 산소농도를 7 mol% 이하로 떨어지지 않도록 10 L/min, 15 L/min, 20 L/min으로 수시로 조절하였다. RUN 3는 접종효과를 보기 위하여 퇴비에 완성된 퇴비를 10 wt% 접종하여 RUN 1, 2와 비교하였다. 지속적으로 교반하고, 온도와 산소 농도에 따라 유입공기량을 조절한 RUN 2와 3에서 RUN 1보다 더 빠른 퇴비화가 이루어졌다 .그리고, $CO_2$농도와 휘발성 유기물 감소에서는 접종한 RUN 3가 RUN 1, 2보다 높았으나, C/N 비, pH 변화, 미생물 개체수에서는 뚜렷한 접종효과가 나타나지 않았다.

• 한국공작기계학회논문집
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• 제18권1호
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• pp.22-28
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• 2009

In order to optimize the polishing process, Run to Run control scheme has been applied to the micro mold polishing in this study. Also, to fully understand the effect of parameters on the surface roughness a design of experiment is performed. By linear approximation of main factors such as gap and rotational speed of micro quill, EWMA (Exponential Weighted Moving Average) gradual mode controller is adopted as a optimizing tool. Consequently, the process converged quickly at a target value of surface roughness Ra 10nm and Rmax 50nm, and was hardly affected by unwanted process noises like initial surface quality and wear of magnetic abrasives.

• 대한환경공학회지
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• 제34권7호
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• pp.467-472
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• 2012

본 연구는 도광판이 Chlorella vulgaris (C. vulgaris)의 증식률에 미치는 영향을 알아보고자 하였다. 각 조건에서의 효율을 평가하기 위하여 C. vulgaris (FC-16) (3~$8{\mu}m$)를 Jaworski's Medium에 온도 $22^{\circ}C$에서 15일 증식시킨 뒤, 광원을 도광판 + LED (Run 1), 형광등 (Run 2) 그리고 LED (Run 3) 로 나누어 바이오매스의 증식률에 미치는 영향을 실험하였다. 실험결과, C. vulgaris의 비증식속도는 Run 1이 Run 2에 비해 14배 그리고 Run 3에 비해 5배 높은 비증식속도를 나타내었다. 11일을 증식시킨 후 C. vulgaris의 평균바이오매스를 비교한 결과 Run 1은 11.79 g/L를 나타내어 Run 2에 비해 30배 그리고 Run 3에 비해 6.5배나 많은 바이오매스를 나타내었다. 도광판을 사용할 경우 빛의 균일한 분포를 증가시키고 그림자 효과를 저해시켜 바이오매스의 증식률이 도광판을 사용하지 않은 반응기에 비해 월등히 높았음을 알 수 있었다.

• 노동경제논집
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• 제21권2호
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• pp.17-46
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• 1998

In this paper, I pursue an empirical analysis of different patterns of employment and wage adjustments to demand changes for the US and Japan. Analyzed are the data in the 70's and 80's, the period that the two countries are believed to show most conspicuous diverging patterns. Using the framework of cointegration and error correction, I establish that in the US it is employment level, while in Japan it is wages, that is more responsive to output fluctuations both in the long run and the short run. All the comparisons on the long run relationships are estimated and tested based on the system cointegrating regressions, and the transition from the short run to the long run responses are investigated using impulse response analysis of the error correction models. I also study differences across genders and establishment sizes within each country. For males and females in Japan, the adjustments are significantly different both in the long run and the short run, but for the firms of different sizes they diverge only in the short run. In contrast to some of the earlier work, the gender effect turns out to be insignificant in the US.

• 한국산림과학회지
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• 제98권2호
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• pp.148-155
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• 2009

The objective of this study is to know market structures of softwood logs being imported to South Korea from log producing countries. Import demand of softwood logs imported to South Korea from America, New Zealand and Chile is fixed as a function of log prices, the lagged dependent variable and output. On the basis of the adaptive expectations model, linear regression models that the explanatory variables included and the lagged dependent variable were estimated by Seemingly Unrelated Regression Equations (SURE). The short-run and long-run own price elasticity of America's softwood log import demand is -1.738 and -4.250 respectively. Then long-run elasticity is much higher than short-run elasticity. Short-run and long-run crosselasticity of New Zealand's softwood log import demand with respect to American's softwood log import price are inelastic at 0.505 and 0.883 respectively. Short-run and long-run cross-elasticity of Chile's softwood log import demands with respect to American's softwood log import prices were highly elastic at 2.442 and 4.462 respectively. Long-run elasticity was almost twice as high as short-run elasticity.