Model Predictive Control (MPC)-Based Supervisory Control and Design of Off-Gas Recovery Plant with Periodic Disturbances from Parallel Batch Reactors

Ryu, Hyuncheol,Lee, Jong Min American Chemical Society 2016 INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH - Vol.55 No.11

<P>This paper proposes a plantwide control structure and a model predictive control (MPC) scheme for the effective separation of off-gas from a polysilicon plant with periodic disturbances in the feed. The target process studied in this work produces 10 000 MT of polysilicon per year with 28 chemical vapor deposition (CVD) reactors. CVD reaction kinetic models were constructed, and their parameters were identified using a genetic algorithm. Aspen Dynamics was used to model the off-gas recovery process and implement proportional-integral (PI) controllers for regulating the inventory levels. A centralized supervisory layer based on MPC, to minimize the fluctuation of the recovered concentration, was linked with regulatory controllers through a MATLAB/SIMULINK environment. Using a rigorous plantwide dynamic model, four cased were studied with different control schemes with and without buffer tanks. The proposed control strategy showed better performance, compared with fully decentralized classical proportional integral derivative (PID) schemes. It is thus expected that the developed control strategy will be able to achieve the design of batch-continuous processes with periodic disturbances. The benefits of using the multivariable MPC approach as a supervisory layer are shown and analyzed using Aspen Plus, Aspen Dynamics, and MATLAB/SIMULINK.</P>

이종 구조에서 위치의 함수로 표시된 효과질량을 포함하는 Schrodinger 방정식을 위치에 무관한 효과질량을 포함하는 방정식으로 변환하는 방법 및 그 응용

이병호,이욱,Lee, Byoung-Ho,Lee, Wook 대한전자공학회 1996 전자공학회논문지-A Vol.33 No.7

a simpel coordinate transformaton method is suggested that converts Schr$\"{o}$dinger's equation involving a position-dependent effective mass in a heterostructure to an equation involving a positon-independent effective mass. This method enables the conceptual study of the effect of the positon-dependent effective mass inserted between the divergence operator and the gradient operator in Schr$\"{o}$dinger's equation. It is also shown that the characteristics such as a transmission coefficient in various heterostructures involving a position-dependent effective masses can be obtained iwth ease by the suggested method.

우루과이라운드 농산물 협상과 농축산물 수입개방 전망

이병호,Lee, Byeong-Ho 대한양돈협회 1991 養豚 Vol.13 No.1

학술논문 - 피로 및 피로균열전파 - : 온도 , 변형율 속도 , 및 분위기가 ASME SA508 Cl . 3 강의 저주파 피로 거동에 미치는 영향

이병호,김인섭 ( Byung Ho Lee,In Sup Kim ) 대한금속재료학회 ( 구 대한금속학회 ) 1993 재료강도 심포지엄 Vol.- No.-

皇龍寺 49萬소斤 巨鐘은 어디로

이병호,Lee, Byung-Ho 한국음향학회 1997 韓國音響學會誌 Vol.16 No.6

작금에 皇龍寺 49萬소斤 巨鐘의 행방이 문제가 되는 것은, 최근 경주시가 그 종을 찾아서, 우리 민족 문화의 국보를 되살리고, 이를 경주 황룡사 종루에 복원하면 그 종소리와 더불어 영원할 것이라는 데 있다. 그리하여 해군에서도 최신 장비를 동원하여 그 종이 빠졌다는 동해구를 뒤지고 있다. 그러나, 그 종은 고려 숙종조에 녹여 져서 신종으로 만들어 졌다는 것이 三國遺事 卷三, 皇龍寺 鐘條에 나와 있다는 것을 발견했다. 그리고, 그것을 기준으로 계산해 보니 皇龍寺 巨鐘: 무게 41.0 ton, 높이 3.14 m, 구경 2.44 m 皇龍寺 新鐘: 무게 7.4 ton, 높이 2.07 m, 구경 1.61 m임이 드러났고 종의 收率(종의 무게/입증)이 聖德大王 神鐘은 34.7 %, 皇龍寺 巨鐘은 13.6 % 임을 알았다. 그리고, 1103년에 皇龍寺 新鐘(7.4 ton)이 원 황룡사 거종이 달려있던 자리에 매달려 있다가, 1238년 11월에, 몽고 제3차 침입군에 의하여 황룡사 전체는 타 버리고, 그 新鐘은 지금의 ④번 國道의 course를 따라 토함산맥 제일 낮은 고개를 넘어, 보문양북면 大鐘川동해구로 끌려가서 동해구에서 몽고행 배에 싣다가 그 곳에 빠뜨렸다고 보여진다. 이번에 잘하면 해군이 7.4 ton의 황룡사 신종을 건질 수 있을런지 모른다. Recently, the search for the whereabout of the huge Bell Imperial-Dragon-Temple becomes a great issue. If it happens to be found out and ringing at the original location of the Bell in Kyungjoo City, the Bell might be a great national treasure and lasting to the eternity with her beautiful sound. The Bell was so huge that the total weight of the raw material put into crucibles was 497,581 Kun (289 tons), the shoulder weight 10.3 Chuk (3.14 m) and the maximum thickness 9 Chon (27.4 cm). The Bell was erected in 754 in Shilla Dynasty and was assumed to be lost during the war time by the 3rd invasion of Mongolians (1235~8). However, the author found out that the huge Bell was recast into a new small Bell (8.1 ton) in 1103 by the people of Koryu Dynasty and then the new small Bell was hung in the same position as in the original huge Bell. 135 years later, the new small Bell was carried out by Mongolian forces as a spoil of war from Kyungjoo to the Bay Tonghaegoo, through the saddle point of Mountain Toham, Yangbuk and Riber Great Bell. At the bay, Mongolian forces wished to bring back the Bell to Mongolia by a ship, but they dropped the Bell into the sea by accident. So, if this was the case, the bell at the seabed may be the new small bell (7.4 ton) but not the original huge Bell (41.0 ton) For the evaluation of missing data of the two bells, the author sets up two equations relating all the dimensions and their weights, which seems to be a useful guide to the design of bells. The results of the evaluation of the Bells are as follows. The huge Bell The new small Bell Weight 41.0 ton 7.4 ton Shoulder ht. 3.14 m 2.07 m Mouth diameter 2.468 m 1.546 m Max. thickness 27.4 cm (9 Chon) 11.9 cm (3.9 Chon)

LSI의 Layout CAD에 관한 연구 -자동 배치 프로그램 개발-

이병호,정정화,임인칠,Lee, Byeong-Ho,Jeong, Jeong-Hwa,Im, In-Chil 대한전자공학회 1984 전자공학회지 Vol.21 No.4

본 논문에서는 LSI layout의 배치 프로그램을 개발하고 그 실험 결과에 관해 논하였다. 100% 결선율 달성을 위해 가상 기선 경로법으로는 실제의 배선에 가까운 알고리즘을 도입하여 채널 밀도 계산에 반영하였다. 목적함수로는 총배선장의 최소화, 통과선수의 최소화, 최대 채널 밀도의 최소화를 동시에 산출 가능한 함수를 도입하였다. 제안된 가상배선경로 계산 알고리즘은 O(n2)으로 계산시간이 매우 바르고 최소배선장에 근사한 배선상태를 나타내므로 배치 문제에 적용하기에 매우 적합하다. 이 알고리즘을 사용하여 자동 배치 프로그램을 개발하고 작성된 프로그램의 실험결과를 통하여 제안된 알고리즘의 유용성을 보였다. A placement program in LSI layout is developed and the results of test are discussed in this paper. In order to achieve 100% wiring, this paper introduces, as a virtual routing method, an algorithm which is close to the real routing. This algorithm is reflected to calculate the channel density. An object function is introduced to achieve minimization of total wire length, number of cuts, and maximum channel density simultaneously. The time complexity for the proposed virtual routing algorithm is O(n2). The time required for the algorithm is very short. This algorithm represents the routing state which is close to minimum wire length. So this algorithm is very proper to the application of placement problem. An auto-placement program is developed by the use of this algorithm. The efficiency of the proposed algorithm is shown in the test of the developed program.

골프장 유출수가 하류수계에 미치는 영향

이병호,김성득,조홍제,조태규,Lee, Byoung Ho,Kim, Seong Deuk,Cho, Hong Je,Cho, Tae Kyu 대한토목학회 1992 대한토목학회논문집 Vol.12 No.3

골프장에서 사용하는 농약에의한 오염 정도에 대해 많은 논쟁이 되고 있다. 이의 연구를 위해 기존의 골프장과 관련된 저수지와 하류수계에 대해 6개월 간에 걸쳐 조사하였다. 그중엔 부영양화에 관련된 수질항목들, 중금속, 농약, 그리고 수중 생태계 등의 전반적인 수질의 결과를 조사수계에 속한 골프장과 관련지어 분석하였다. 골프장으로부터 유출된 농약등의 오염이 조사수계의 수중 생태계에 미치는 영향은 심각한 정도가 아닌 것으로 나타났다. 골프장으로부터 유출되는 잔류농약의 분해를 돕기 위한 댐내에서는 수중 생태계가 잘 보전 돼있었고 전형적인 먹이의 연쇄가 확립돼 있었다. 일반적인 인식과는 달리 가축 축사와 논으로부터 유출되는 오염이 수계에 훨씬 더 약 영향을 미치는 것으로 나타났다. There has been a great deal of controversy in the views on the impact of the pesticide pollution from the golf courses. The stream and reservoir associated with a existing golf course were investigated. The parameters include the ones related with eutrophication, heavy metals, pesticides. and aquatic ecological conditions. It was found that the impact on the aquatic ecosystem by the pollution from the golf course was not so serious. An aquatic ecological food chain was well established in the reservoir which belongs to the golf course. In contradiction to the general recognition, the livestock farming and agricultural farming gave much more adverse impacts on the stream than the golf course.

욕조의 보온성능연구

이병호,서정일,Lee, Byung-Ho,Suh, Jung-Il 대한설비공학회 1981 설비저널 Vol.10 No.1

In this paper, a new performance equation of bath tubs has been derived, which is very characteristically illuminating and in good agreement with experiments : $$T=T_{\infty}+(T_0-T_{\infty})e-\frac{k(A'_f+A_0)}{Mc_{P{\Delta}x}t$$, where $T_{\infty}$ is the temperature of the bathroom, $T_0$ that of the bathwater at t=0, k the overall heat conductivity of the tub- wall, $A'_f$ the equivalent surface area to the wall, $A_0$ the submerged area of the tub-wall, M mass of the bath-water, $C_p$ the specific heat of the bathwater and ${\Delta}x$ the thickness of the tub-wall. Here the equivalent-free surface area is written as $$A'_f=mA_f,\;m=const.(1-{\phi})^{0.88}$$ : where m is a numerical factor which is determined by a simple experiment and some calculation, {\phi}$ the relative humidity and $A_f$ the real free-surface area. From this study, it has been clarified that cooling of bath-water is mainly due to mass-transfer through evaporation from the free surface and conductive heat loss through the tub-wall is minor, which rather gaily mock at common sense. The effect of keeping bathwater warn by increase of the tub-wall thickness is also analyzed by a new idea of the thickness gain factor.

집적영상과 체적형 3D 디스플레이 기술

이병호,Lee, Byeong-Ho 한국정보디스플레이학회 2005 인포메이션 디스플레이 Vol.6 No.6

Gate Array의 Global Routing 기법

이병호,정정화,임인칠,Lee, Byeong-Ho,Jeong, Jeong-Hwa,Im, In-Chil 대한전자공학회 1985 전자공학회지 Vol.22 No.3

본 논문에서는 VLSI layout CAD에 있어서의 새로운 그로발 라우팅(global routing) 기법을 제안하고 이에 관하여 논하였다. 종래의 그로발 라우터에서는 핀의 위치를 모두 셀의 중앙에 두었기 때문에 신호선의 채널 사용량을 정확히 산출할 수 없었다. 그 결과 디테일드 라우팅 (detailed routing)시 배선량 overflow가 발생하여 100% 결선을 저해하는 많은 요인을 내포하고 있었다. 본 논문에서는 이러한 문제점을 모두 보완하기 위하여 핀순서를 고려한 새로운 방법의 그로발 라우팅 알고리즘을 제안하였다. 이 알고리즘을 사용하여 그로발 라우터를 실현하고, 계산기상의 실험 결과를 통하여 제안한 알고리즘의 유용성을 보였다. A new glut bel routing technique for gate array is described in this paper. In former global routers the position of pins is considered to be in the center of the cell. So it is impossible to exactly estimate the number of signal lines passing through each channel. As a result, an overflow occurs and the overflow violates 100% wiring in detailed routing pro-cesses. Besides this, there are some problems in former global routers, for example, design time and cost, etc. This paper proposed a new algorithm in which pins ordering is considered to solve these problems. Using this algorithm, a global router is developed. Program experiments show the efficiency of the proposed algorithm.