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Denbigh 반응계 최적화 문제의 Discrete Maximum Principle 에 의한 재고
손병진,권영수,남궁식 한국화학공학회 1966 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.4 No.2
The problem of an optimum temperature sequence in stirred tank reactors was proposed by Denbigh and then discussed from the dynamic programming point of view by Aris, is here reconsidered by means of the discrete maximum principle. The general method is given to deal with Denbigh's problems for any numerical examples by means of this principles. For the same numerical example as Aris', the solutions, not only for the case without the physical restrictions imposed on temperature and holding times, but also for the case with them, are given for single reactor, two reactor and three reactor system, and compared with Aris' solutions. The solutions are solved analytically for single reactor and two reactor system. The comment on Aris' paper for the policies under the restrictions is given.
Optimal design of a composite space shield based on numerical simulations
손병진,유정훈,이민형 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.12
In this study, optimal design of a stuffed Whipple shield is proposed by using numerical simulations and new penetration criterion. Thetarget model was selected based on the shield model used in the Columbus module of the international space station. Because experimentalresults can be obtained only in the low velocity region below 7 km/s, it is required to derive the Ballistic limit curve (BLC) in the highvelocity region above 7 km/s by numerical simulation. AUTODYN-2D, the commercial hydro-code package, was used to simulate thenonlinear transient analysis for the hypervelocity impact. The Smoothed particle hydrodynamics (SPH) method was applied to projectileand bumper modeling to represent the debris cloud generated after the impact. Numerical simulation model and selected material propertieswere validated through a quantitative comparison between numerical and experimental results. A new criterion to determine whetherthe penetration occurs or not is proposed from kinetic energy analysis by numerical simulation in the velocity region over 7 km/s. The parameteroptimization process was performed to improve the protection ability at a specific condition through the Design of experiment(DOE) method and the Response surface methodology (RSM). The performance of the proposed optimal design was numerically verified.
Stabilization Splint Fabrication using CAD/CAM and 3D Printing
손병진,김욱,김재홍,백우봉 대한안면통증∙구강내과학회 2019 Journal of Oral Medicine and Pain Vol.44 No.2
A conservative treatment approach to temporomandibular disorder (TMD) is recommended as the first line of management, usually with a stabilization splint. Recently, computer-aided design/computer-aided manufacturing and three-dimensional printer has been widely used in the dentistry since several years ago. The authors apply digital dentistry in oral medicine fields to make stabilization splint for TMD treatment.