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하진국 ( Jin Kuk Ha ),이의수 ( Euy Soo Lee ) 한국화학공학회 2005 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.43 No.5
We propose a new optimization framework for the reactive scheduling. The proposed rescheduling scheme is specially focused on how to generate rescheduling results when equipment failure occurs. The approach is based on a continuous-time problem representation that takes into account the schedule in progress, the updated information on the batches still to be processed, the present plant state, the deviations in plant parameters and the time data. To update the predictive scheduling, we used right shift rescheduling and total regeneration when equipment failure occurs. And, a practical solution to the rescheduling problem requires satisfaction of two often confliction measures: the efficiency measure that evaluates the satisfaction of a desired objective function value and the stability measure that evaluates the amount of change between the schedules before and after the disruption. In this paper, the efficiency is measured by the makespan of all jobs in the system. And, the stability is measured by the percentage change in makespan and the modified sequence deviation in the predictive scheduling and rescheduling.
직렬구조의 회분식 공정에서 저장시간제약을 고려한 다품종생산 공정운용 모델개발
하진국,이범석,이인범,이의수 ( Jin Kuk Ha,Bom Sock Lee,In Beum Lee,Euy Soo Lee ) 한국화학공학회 1998 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.36 No.5
The scheduling literature dealing with serial multiproduct systems has focussed on the determination of completion times for the various types of the intermediate storage policies such as UIS, FIS, NIS and ZW. In practical applications, time limitations will exist while storing the intermediate products in the storage vessel due to the time dependent changes of the chemical and physical properites. This paper presents an completion time calculation model for serial multiproduct batch process with storage time constraints. A set of recurrence relations for serial multiproduct processes in ZW and NIS policy is suggested. These results are used to describe an completion time algorithm for the case where NIS and ZW mode is used between pair of processing stages. Finally, these models were extended to treat the more usual case involving both policies in systems. The effectiveness of the proposed model is illustrated with a example.
이서영 ( Suh-young Lee ),하진국 ( Jin-kuk Ha ),이인범 ( In-beum Lee ),이의수 ( Euy Soo Lee ) 한국화학공학회 2020 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.58 No.4
In this study, a mathematical model for optimal operation of the fusion fuel cycle is developed based on scheduling approach. The fusion fuel cycle consists of a system for storing and supplying deuterium and tritium, and receiving and separating process after the fusion reaction. Except that tritium is a radioactive material, most of these processes consist of catalytic reactions and separation process. For these reasons, it is possible to apply scheduling approach which is also widely utilized to chemical plants to derive the optimal operating scenarios. The developed model determined the optimal regeneration cycle to minimize the amount of tritium inside the vacuum pumps. Based on the characteristics of various device in the fusion reactor, the optimal tritium plant operation scenario is evaluated. The formulated model was applied to the actual tokamak scenario and utilized to analyze the fuel flow and balance of ITER fuel cycle.
공정시스템 , 이동현상 , 화학공정안전 : 품질검사를 고려한 제품 저장조의 최적 일정계획
이경범(Gyeong Beom Yi),신동일(Dong Il Sin),이호경(Ho Kyung Lee),이범석(Bom Sock Lee),하진국(Jin Kuk Ha),이의수(Euy Soo Lee) 한국화학공학회 2001 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.39 No.2
The mined integer linear programming model has been developed for the production scheduling of liquid state polymer process such as a Polybutene(PB). The example process is composed of one reactor, twelve storage tanks and two package types. The reactor produces 9 liquid state products. The products are reserved in tanks and then, packaged into drum or isocontainer. The drum products are stored in a warehouse before they are shipped out to customers but the isocontainer products are shipped directly out to customers. Two major products use multiple tanks. Most tanks are dedicated to a certain product but basically any tank can be shared by any product The reactor is operated on block mode. The unique characteristic of this scheduling problem exists on the fact that the product in a tank should be locked for 3-15 days in order to check the quality specifications after run-down from the reactor. The primary objective of scheduling is reducing the number of quality checking processes because it causes great loss in production time and tank utilization. The model is composed of about 1,500-2000 integer variables. The branching priorities are adjusted according to the importance of variables based on current manual scheduling practice and it greatly enhanced the convergence of the mixed integer model.