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朴鍾烈 영남이공대학 1981 論文集 Vol.10 No.-
It is one of the weak point of cement mold that, at low temperture, delay of coagulating rreaction of cement comes to lengthen out the strip time. So it is necessisary using hardening accelerator in winter. In order to improve the slowhardening of cement sand, Cacl_2·NaOH·Al Powder can be added as hardening accelerator. At 5℃ sand temperature, strip time of ordinary portland cement sand was 12hours. But adding CaCl_2(2%) or NaOH(1%) shortened strip time to less then 3 hours. NaOH was more efficient accelerator than CaCl_2. Its addition amount was small and it accelerated not only coagulating reaction but also hardening reaction of cement. Al powder was so excellent accelerator that adding small amount (0.1%) with NaOH (1%) shortened strip time to 1 hour. But it is difficult to use Al powder because bench life was too short to establish molding time. Then it can be efficiently used under intense cold atmosphere with NaOH to shorten strip time.
Three Step Iterative Algorithms for Generalized Quasivariational Inclusions
박종열,정재욱 대한수학회 2004 대한수학회보 Vol.41 No.1
In this paper, we suggest and analyze some new classesof three step iterative algorithms for solving generalizedquasivariational inclusions by using the properties of proximalmaps. Our results include the Ishikawa, Mann iterations forsolving variational inclusions(inequalities) as special cases. Theresults obtained in this paper represent an improvement andsignificant refinement of previously known results [3, 5-8, 10,14-18].
박종열,김정애 대한수학회 2005 대한수학회지 Vol.42 No.6
In this article we prove the existence of the solution to themixed problem for Euler-Bernoulli beam equation with memorycondition at the boundary and we study the asymptotic behavior ofthe corresponding solutions. We proved that the energy decay withthe same rate of decay of the relaxation function, that is, theenergy decays exponentially when the relaxation function decayexponentially and polynomially when the relaxation function decay polynomially.
朴鍾烈,趙光濟 경북대학교 교육대학원 1987 논문집 Vol.19 No.-
Systems Analysis Models have been recognized as most effective tools which can analyze and examine the complex educational Systems. The purpose of this study is to examine the System Analysis Models of Educational Administration, and to construct the Comprehensive Systems Analysis Models of Educational Administration which can analyze and describe Korean Educational Administration System it terms of organizational level. The Educational Administration System as hierarchy may be divided into four subsystem such as Educational Policy System, Educational Management System, School Management System, and Classroom Management System. The Contents of 4 Systems Analysis Models of Educational Policy were developed by Easton, Campbell, Dror, and Sharkansky, 3 Systems Analysis Models of Educational Management, by Kaufman, Owens, and Kim Jong-Chul, 3 Systems Analysis Models of School Management, by Kimbrough, Hoy & Miskel, Lipham & Hoeh, and 2Systems Analysis Models of Classroom Management, by Lemlech, and Kim Se-Kee, respectively, were examined in this study. On the basis of examined contents of above Systems Analysis Models, These writers attempted to construct a Systems Analysis Model of Educational Administration in terms of organizational level. (See figure 14) The model, Comprehesive Model for Systems Analysis of Educational Administration, may be used as an useful Systems Analysis Model in order to adapt and analyze for Korean Educational Administration System.
Design of High Performance Full-Swing BiCMOS Logic Circuit
박종열,한석붕,Park, Jong-Ryul,Han, Seok-Bung The Institute of Electronics and Information Engin 1993 전자공학회논문지-B Vol.30 No.1
This paper proposes a High Performance Full-Swing BiCMOS (HiF-BiCMOS) circuit which improves on the conventional BiCMOS circuit. The HiF-BiCMOS circuit has all the merits of the conventional BiCMOS circuit and can realize full-swing logic operation. Especially, the speed of full-swing logic operation is much faster than that of conventional full-swing BiCMOS circuit. And the number of transistors added in the HiF-BiCMOS for full-swing logic operation is constant regardless of the number of logic gate inputs. The HiF-BiCMOS circui has high stability to variation of environment factors such as temperature. Also, it has a preamorphized Si layer was changed into the perfect crystal Si after the RTA. Remarkable scalability for power supply voltage according to the development of VLSI technology. The power dissipation of HiF-BiCMOS is very small and hardly increases about a large fanout. Though the Spice simulation, the validity of the proposed circuit design is proved.
Optimal control problems for the semilinear second order evolution equations
박종열,박선혜 대한수학회 2003 대한수학회지 Vol.40 No.5
In this paper, we study the optimal control for the dampedsemilinear hyperbolic systems with unknown parameters(C(t)y')'+A_2(t,q)y'+A_1(t,q)y=f(t,q,y,u).We will prove the existence of weak solution of this system andis to find the optimal control pair (bar{q},bar{u})inQ_{tau}times {mathcal U}_{ad} such that inf_{uin {mathcalU}_{ad}}sup_{qin Q_{tau}}J(q,u)=J(bar{q},bar{u}).