• Journal of Welding and Joining
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• 제33권6호
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• pp.13-20
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• 2015

Many automotive companies are endeavoring to improve the quality of resistance spot welding by updating body-in-white (BIW) production line with adaptive control spot welding system to compensate the process disturbances such as gap, electrode wear, oxidized surfaces, poor fit up and adhesive etc. Most of the commercial adaptive weld controllers require proper "Initial Welding Schedule" or "Reference weld" to achieve compensation in welding parameters during real time welding. In this study, the compensation of a commercial adaptive weld controller had been observed and analyzed thoroughly for various process disturbances to find optimal initial welding schedule. It was observed that 90 percent of the expulsion current in constant current control as reference welding schedule conferred the maximum button diameter in adaptive control welding. Finally, effects of each disturbance in combined field disturbances system with adaptive control had also been confirmed with the design of experiment (DOE) by minitab(R)16 for combined disturbances situation and suitability of optimum initial weld current had also established with real body part validation test.

• 전기학회논문지
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• 제63권12호
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• pp.1627-1636
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• 2014

In real-time electricity price environment, the energy management system can provide the significant advantage to the residential, commercial and industrial customers since it can reduce the electricity charge by controlling the load operation effectively in response to time-varying price. However, the earlier studies for load management mainly focus on the residential and commercial customers except for the industrial customers because most of load operations in industrial sector are intimately related with production schedule. So, it is possible that the inappropriate control of loads in industrial sector causes huge economic loss. In this paper, therefore, we propose load control algorithm for factory energy management system(F-EMS) to achieve not only minimizing the electricity charges but also maintaining production efficiency by considering characteristics of load operation and production schedule. Considering characteristics of load operation and production schedule, the proposed load control algorithm can reflect the various characteristics of specific industrial customer and control their loads within the range that the production efficiency is maintained. Simulation results show that the proposed load control algorithm for F-EMS leads to significant reduction in the electricity charges and peak power in industrial sector.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1996년도 한국자동제어학술회의논문집(국내학술편); 포항공과대학교, 포항; 24-26 Oct. 1996
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• pp.1028-1031
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• 1996

Dynamic scheduling is very important in constructing CIM and improving productivity of chemical processing systems. Computation at the scheduling level requires mostly a long time to generate an optimal schedule, so it is difficult to immediately respond to actual process events in real-time. To solve these problems, we developed dynamic scheduling algorithms such as DSMM(Dynamic Shift Modification Method), PUOM(Parallel Unit Operation Method) and UVVM(Unit Validity Verification Method). Their main functions are to minimize the effects of unexpected disturbances such as process time variations and unit failure, to predict a makespan of the updated dynamic schedule and to modify schedule desirably in real-time responding to process time variations. As a result, the algorithms generate a new pertinent schedule in real-time which is close to the original schedule but provides an efficient way of responding to the variation of process environment. Examples in a shampoo production batch process illustrate the efficiency of the algorithms.

• 한국식물병리학회지
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• 제10권4호
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• pp.284-291
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• 1994

In order to establish an appropriate spray schedule to reduce the infection, 11 kinds of chemicals were tested for their properties on the inhibition of spore germination at the surface of apple fruits and the duration of the inhibitory effect after spray of each chemical was examined from late June to early September with basically 10 day intervals. Actual control efficacy of each chemical by the 8 successive spray and the patterns of waterborne spore dispersals during that periods were also examined. Combining those results with the meteorological observation data, actual control efficacy of each chemical in the given periods could be estimated. It was revealed that folpet, Brodeaux mixture, mancozeb, oxine copper and imminoctadine-triacetate could be used at any time during the possible infection periods. Captan and dithianon could also be used except the rainy season due to the short duration of inhibitory efficacy against spore germination under heavy rain. However, the usefulness of propineb, benomyl and chlorothalonil against the apple white rot could not be demonstrated in this experiment. Thiram, even though has not been used for apple white rot, can also be used before or after the rainy season to control not only white rot but also alternaria blotch.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2002년도 학술대회지
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• pp.498-503
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• 2002

건설 프로젝트의 자원관리는 공사원가의 절감, 건축물의 공정 및 품질확보에 직접적으로 관계되어 이외의 공사관리 요소와 함께 매우 중요한 요소를 차지하고 있다. 하지만 자원소요계획은 공사초기에 수립되고 고려요소가 다양하여 전사적 차원의 자원소요계획을 수립하기에는 한계가 있고, 관리자간의 정보의 단절로 실적정보관리가 불가능하다. 건설공사의 유기적 관리를 위해서는 각 관리 부분의 체계적 구성이 필요하며, 각 관리간의 사업수행정보와 실적자료의 주기적인 갱신으로 이루어져야 한다. 건설프로젝트관리체계에 맞추어 핵심 관리 요소는 비용과 일정정보라 할 수 있으며, 자원소요계획은 비용${\cdot}$일정 통합관리의 실적 데이터를 이용하여 자원소요계획의 근거를 명확히 하고, 발주속성과의 연계성 분석을 통하여 발주시점을 명확히 할 필요가 있다. 본 논문에서는 비용${\cdot}$일정 통합관리의 실적데이터 정보와 자원소요계획의 연계방안을 통하여, 자재소요산출방법과 자재별 발주속성을 고려한 자원관리체계를 제시한다.

• 식물병연구
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• 제11권1호
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• pp.39-42
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• 2005

Sphaerotheca aphanis var. aphanis에 의한 딸기 흰가루 병은 수확기에 발생하여 국내에서 가장 큰 문제가 되고 있는 중요한 병해이다. 딸기 흰가루병은 초기에 적절히 방제하지 않았으 경우 급격히 전반되어 방제가 어렵기 때문에 재배초기의 적절한 약제처리가 흰가루병 방제에 필수적이다. 이 연구는 효과적인 수확기 흰가루병 방제를 위한 최적의 약제처리시기를 밝혀내고자 감수성 품종인 'Akihime'와 'Dochiodome'를 대상으로 개화 전 약제 처리체계에 따른 방제효과를 비교, 분석하였다. Strobilulin 계통의 azoxystrobin과 kresoxim-methyl 및 유기동제인 DBEDC를 처리시기와 방법을 달리하여 딸기 수확기까지 처리하였다. 여러 가지 처리조합 가운데 딸기 묘를 정식 전 DBEDC에 침지 처리한 후 개화 전 멀칭시기에 kresoximmethyl 엽면살포하는 방법이 흰가루병 방제에 가장 효과적이었다. 이 방제체계는 촉성재배시 수확기 흰가루병 방제에서 처리시기의 중요성을 제시할 뿐만 아니라 재배자에게도 저농약 재배방법을 제공하고 경영비도 감소시켜 줄 것이다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1993년도 한국자동제어학술회의논문집(국내학술편); Seoul National University, Seoul; 20-22 Oct. 1993
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• pp.613-618
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• 1993

This paper presents the aircraft autopilot system with a pre-designed gain schedule. It is mainly consisted of the parameter estimation end the autopilot system design. For off-line parameter estimation, leastsquare methods are investigated. The design of a controller is done in frequenced domain using classical control method and it is designed to satisfy the predetermined requirement such as time constant and transient response. Finally, it is compared with a optimal regulator.

• 제어로봇시스템학회논문지
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• 제11권2호
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• pp.167-174
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• 2005

This paper experimentally validates the efficacy of scheduling method that satisfies the performance requirement of periodic data in the Foundation Fieldbus. The scheduling method allocates periodic data traffic to a bandwidth-limited fieldbus medium. The scheduling method generates schedule list that records schedule starting time and schedule period of each periodic data. This study developed an experimental model of a Foundation Fieldbus network system. Using the experimental model, this study showed that the scheduling method can be easily implemented in a practical Foundation Fieldbus network system. The results obtained from the experimental evaluation showed that the scheduling method restricts the delay of periodic data to a pre-specified bound.

• 한국건설관리학회논문집
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• 제1권4호
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• pp.82-90
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• 2000

낙후된 국내 건설관리기술을 선진화$\cdot$합리화하기 위한 방안 중의 하나로 공정-공사비 통합관리가 많은 주목을 받고 있다. 정부에서도 공정과 공사비의 통합관리의 필요성을 인식하고 이의 도입을 적극검토하고 있다 실제로 해외공사를 통해서 양성된 국내 공정관리 전문가들의 노력으로 최근 일부 공공기관의 건설사업에서는 공정-공사비 통합관리를 부분적으로 활용하고 있는 상황이다. 그러나 그 기법 및 전산모델이 이론에 국한된 것이거나 국내의 특수한 여건을 수용하지 못하는 것이 대부분이기 때문에 활용에 많은 어려움이 있으며 국내 건설환경에 완전하게 정착되지 못하고 있다. 본 연구의 목적은 통합관리의 정착을 지연시키는 국내의 특수한 여건 및 문제점을 파악하고 이를 토대로 국내 건설현장에서 적용할 수 있도록 공정-공사비 통합모델의 개선방안을 제시하는 것이다.

• 생물정신의학
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• 제6권2호
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• pp.240-245
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• 1999

Object : This study was designed to evaluate the effects of olanzapine on the schedule-induced polydipsia(SIP) which is one of animal model of obsessive-compulsive disorder in rats. We administered olanzapine as a serotonin and dopamine blocking agent, fluoxetine as a selective serotonin reuptake inhibitor, and haloperidol for the dopamine antagonist to rats which showed schedule-induced polydipsic behavior. Methods : Spraque-Dawley rats weighing 200-250gm were individually housed and maintained and allowed free access to water. The rats were placed on a restricted diet. To induce polydipsia, rats were placed in the cage where a pellet dispenser automatically dispensed 90mg pellets on a fixed-time 60 seconds(FT-60s) feeding schedule over 150 minute test session per day. Water was available at all times in the cage. After 4 weeks of daily exposure to the FT 60s feeding schedule, experimental rats met a predetermined criterion for polydipsic behavior(greater than 3 times of water per session on average). 5 groups of rats were administered olanzapine(3mg/kg, i.p), olanzapine(10mg/kg, i.p), fluoxetine(5mg/kg, i.p.), haloperidol(0.1mg/kg, i.p.), and vehicle(1cc/kg, i.p.) for 3 weeks. The rats were tested once a week to access schedule induced polydipsic behavior. Water bottles were weighed before and after the 150-minute test session. The chronic effects of administration of experimental drugs on schedule induced polydipsic behavior were analyzed with ANOVA and Scheffe test as a posthoc comparison. In order to measure water consumption in non-polydipsic food-deprived rats, a separate group of rats(N=8) were individually housed and given a single bolus(14.5gm) of food per day which maintained them at their average body weight. Results and Conclusion : The results were as follows ; 1) After 4 weeks of scheduled feeding procedure, the experimental group showed significant differences than the bolus control in the amount of water consumption as compared with their average water intakes for 4 weeks. At the same periods, there were no differences between the experimental group and the bolus control in the body weight. 2) The fluoxetine group showed significant decrease in the amount of water intake over the 3 weeks of drug treatment as compared with their average amount of polydipsic water intakes. The olanzapine 3mg group showed significant decrease in the amount of water intake at 3rd weeks of drug treatment as compared with their average amount of polydipsic water intakes. The olanzapine 10mg group showed significant decrease in the amount of water intake at 2nd and 3rd weeks of drug treatment as compared with their average amount of polydipsic water intakes. However, the haloperidol group and the vehicle control group showed no changes of amounts of water intake for 3 weeks of treatment as compared with their average amount of polydipsic water intakes. 3) The fluoxetine group showed significantly lower amounts of water intake than the haloperidol group at 2nd weeks of drug treatment. And also the fluoxetine group showed significantly lower amounts of water intake than the haloperidol group and the vehicle control at 3rd weeks of drug treatment. The olanzapine 3mg group and the olanzapine 10mg group showed significantly lower amounts of water intake than the haloperidol group and the vehicle control at 3rd weeks of drug treatment. Above findings suggest that the fixed time feeding procedure for schedule-induced polydipsia as an animal model of obsessive compulsive disorder was effective to the evaluation of pharmacological challenge study. The authors assume that the serotonin hypothesis and the serotonin-dopamine interaction hypothesis are preferred to the dopamine hypothesis in the biological etiology of obsessive-compulsive disorder.