• Journal of the Korean Mathematical Society
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• v.35 no.1
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• pp.115-126
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• 1998

We study the optimal control problem of system governed by retarded functional differential $$ x'(t) = A_0 x(t) + A_1 x(t - h) + \\ulcorner\ulcorner\ulcorner_{-h}^{0} a(s)A_2 x(t + s)ds + B_0 u(t) $$ in Hilbert space H. After the fundamental facts of retarded system and the description of condition so called a weak backward uniqueness property are established, the technically important maximal principle and the bang-bang principle are given. its corresponding linear system.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 2004.04a
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• pp.215-218
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• 2004

This paper is about a study of development on multi crusher system. This system use the principle of the Yeon-Ja-Bang-A. This system consists of the power part and the power transmit part, the Yeon-Ja Stone part, the crusher part, an input part, an output part. The advantage of this system decrease about working hours and installation aera.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.20 no.8
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• pp.534-540
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• 2008

In this paper, the optimal bang-bang control problem of an air-conditioning system with slab thermal storage was formulated by gradient method. Furthermore, the numeric solution obtained by gradient method algorithm was compared with the analytic solution obtained on the basis of maximum principle. The control variable is changed uncontinuously at the start time of thermal storage operation in an analytic solution. On the other hand, it is showed as a continuous solution in a numeric solution. The numeric solution reproduces the analytic solution when a tolerance for convergence is applied severely. It is conceivable that gradient method is effective in the analysis of the optimal bang-bang control of the large-scale system like an air-conditioning system with slab thermal storage.

• Journal of Korean Medical classics
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• v.33 no.4
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• pp.57-66
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• 2020

Objectives : This study aims to grasp the principle of the Won Bang supplementation and draining method as mentioned in the 『Lingshu·Guanneng』 and the 『Suwen·Bazhengshenminlun』, which have contrasting properties. Methods : The texts in each chapter were analyzed to understand the supplementation and draining principle that matches the meanings of round[won,員] and angular[bang, 方]. Especially in the case of the chapter 「Bazhengshenminlun」, a hypothesis was drawn upon the relationship between the abstract explanation of the round[won,員] and angular[bang, 方] and the actual manipulation technique. This hypothesis was tested against other texts and annotations for further discussion. Results & Conclusions : The expressions 'bang[angular, 方]' and 'won[round,員]' refer to the same meanings in both chapters, as 'to be upright' and 'to be smooth,' respectively. The difference between the two chapters is that in the 『Lingshu·Guanneng』 the standard for Won Bang is the needler's movements, while in the 『Suwen·Bazhengshenminlun』, it is the patient's breathing. Moreover, while in the former the subjects of supplementation and draining are clearly divided into healthy qi and exterior pathogenic qi, in the latter the subject of manipulation is the deficiency and excessiveness caused by deviation of the healthy qi, thus making the subject of both supplementation and draining healthy qi. Based on these findings, we can conclude that the supplementation and draining of needling is divided into two methods; separating the healthy and pathogenic qi and manipulating the deficiency and excessiveness of healthy qi within the body.

• The Journal of Korean Medical History
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• v.15 no.2
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• pp.117-134
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• 2002

"Gup Yu Bang" is the first Korean book that specialized in pediatrics. It was written by Jo Jeong-jun on the 25th year of King Young Jo in the Choson dynasty. He quoted a lot of information from "Yi-Hak-Yip-Mun" by Yi-cheon in the Myung dynasty and "Xiao Er Yao Zheag Zhi Jue" by Qian Yi in the Song dynasty, but he added his own opinions and clinical experiences to the book. In addition to that, the book explains not only symptoms and prescriptions but also the etiology and pathology of children's diseases. In particular, he showed a great deal of creativity in his book called "Dong Bang Six Fu's Qi Principle" After studying "Gup Yu Bang", I have drawn the following conclusions. 1. Prevention is more important than treatment in pediatrics. 2. When we make a diagnosis, facial inspection has priority. 3. In terms of treatmemt, Wu zang is a general rule. Therefore, we should focus on Wu zang and Pi Wei. 4. The following terms definition symptom cause prescription clinical example prevention are to be explained with reference to the nature or symptoms of the disease. 5. We can see that smallpox was more widspread than the measles in the period of King Young Jo. 6. Even though he was influenced by "Yi-Hak-Yip-Mun", "Xiao Er Yao Zheag Zhi Jue", and "Dong eui bo gam", his own explanation is clearer in his book called "Gup Yu Bang" which is based on his own clinical experiences. 7. "Gup Yu Bang" is a practical and experiential book.

• The Transactions of the Korean Institute of Electrical Engineers
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• v.33 no.3
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• pp.91-99
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• 1984

Time-optimal control for dmping a one-dimensional xenon-induced spatial power oscillations in pressurized water reactor is studied. Linearized system equations describing the spatial xenon oscillations have been derived based on lambda mode analysis. Optimal control strategies, eventually bang-bang controls, have been drawn applying Pontryagins Minimum Principle, subject to a band constraint on available contros strength. Validity of the linearized system equations and optimal control strategies derived has been demonstrated through conputer simulations which incorporate the finite difference method for one dimensional axial geometry, for the soulution of the two-group neutron diffusion equations. The results obtained through computer simulations show that xenon-induced transients can be suppressed successfully with bang-bang control.

• The Journal of Korean Medicine Ophthalmology and Otolaryngology and Dermatology
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• v.24 no.2
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• pp.96-103
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• 2011

Objective : The purpose of this study is to know the effect of Ko-Bang(古方) on nummular eczema. Methods : We decided the treatment principle through the abdominal examination and symptoms. We gave Ko-Bang to the patient and observed the progress. We used visual analogue scale(VAS). Results : After the treatment the grade of VAS was decreased and the symptoms of nummular eczema were significantly improved. Conclusion : After the treatment of Hwanggijakyakgyejigoju-Tang(黃耆芍藥桂枝苦酒湯), the symptoms of nummular eczema were disappeared and Ko-Bang was effective on the treatment of intractable skin diseases.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2018.05a
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• pp.29-30
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• 2018

• Journal of the Korean Operations Research and Management Science Society
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• v.3 no.2
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• pp.91-93
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• 1978

A methodology which can be employed to obtain an optimal preventive maintenance policy that maximizes the total machine running time over the specified working period is proposed. A system considered is comprised of m machines and r

• Korean Journal of Pharmacognosy
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• v.15 no.4
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• pp.173-175
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• 1984

Fractionation of methanolic extract of Asarum sieboldii monitoring by bioassay resulted in the isolation of methyleugenol as a spasmolytic principle. Its $pD'_2$ value was 4.3.