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부신 제거 백서에 티타늄 임플랜트 매식후 주위 골형성에 관한 연구
최갑림,김종렬,박봉수,성일용 대한악안면성형재건외과학회 2000 Maxillofacial Plastic Reconstructive Surgery Vol.22 No.3
The use of dental implants has increased tremendously in recent years and is expected to increase even more in the future. The successful outcome of any implant procedure is surely dependent on interrelationship of the various components of an equation that includes biocompatibility of implant material, macroscopic and microscopic nature of the implant surface, the status of implant bed, surgical technique, undisturbed healing phase and subsequent prosthetic design and long-term loading phase. The purpose of this study was to clarify the effects of adrenalectomy on the osseointegration of pure titanium implants. Seventy rats, 11 weeks of age, were divided into two groups : an adrenalectomized group and a control group. Titanium screw implant(diameter, 2.0mm ; length, 3.5mm) was placed into left tibia of 70 rats, 35 in control group and 35 in the experimental group. The rats were sacrificed at different time interval (1, 2, 3, 4, 6, 8, and 12 weeks after implantation) for histopathologic observation, histomorphometric analysis and immunohistochemistry with fibronectin and CD44 antibody. The results obtained from this study were as follows : 1.Histopathogically, findings, newly formed bone was seen at 3 weeks control group and became lamellar bone at 12 weeks. At 6 weeks, lipocytes were observed in bone marrow space. Thickness of regenerated trabecular bone increased till 6 weeks after then, that decreased gradually. 2.By histomorphometric analysis, marrow bone density and contact ratio of marrow bone to implant decreased significantly from 8 to 12 weeks in experimental group compared to control group and also total bone to implant contact ratio decreased significantly from 4 to 12 weeks in experimental group compared to control group. 3.Fibronectin immunoreactivity was very strong at 3 and 4 weeks control group. And after that reduced gradually. But it was continuously strong from 1 to 12 weeks experimental group. 4.CD44 immunoreactivity was very strong in the newly formed osteoblasts at 3 and 4 weeks control group. But it reacted minimally later. However, it reacted continuously strong from 3 to 12 weeks experimental group. From these results, bone to implant contact ratio decreased gradually from 4 weeks in adrenalectomized group compared to control group. CD44 and fibronectin immunoreactivities were strong at all times in adrenalectomized rats. Therefore, it could be stated that immature bone remained continuously for a long time and not readily proceeded into mature status.
최영석,이용갑,주종일 호서대학교 반도체제조장비국산화연구센터 2001 반도체장비학술심포지움 Vol.2001 No.-
본 논문에서는 전산유체해석 기법을 이용하여 저소음 · 고효율 공조기의 입구형상에 대한 유동해석을 하였다.공조기 입구형상을 결정하는 여러 설계변수가 입구와 출구의 유동조건과 유로의 압력손실에 미치는 영향을 평가하였다.이를 바탕으로 입구와 출구유동의 균일성과 압력손실의 최소화를 만족하는 최적의 설계변수를 결정하여 공조기의 최적설계를 달성하였다.
LIMIT THEOREMS FOR PARTIAL SUM PROCESSES OF A GAUSSIAN SEQUENCE
Choi, Yong-Kab,Swang, Kyo-Shin,Moon, Hee-Jin,Kim, Tae-Sung,Baek, Jong-Il Korean Mathematical Society 2004 대한수학회지 Vol.41 No.6
In this paper we establish limsup and liminf theorems for the increments of partial sum processes of a dependent stationary Gaussian sequence.
Large Deviation Probabilities and Related Erdo¨s-Re´nyi Laws
Choi, Yong Kab 慶尙大學校 기초과학연구소 1985 基礎科學硏究所報 Vol.1 No.-
이 論文에서는, 確率變數의 數列 {X_n:n=1,2,…}에 의해 이루어진 實數값을 취하는 確率變數의 一般化된 增分數列 {T_n,k:n=0,1…; K=1,2,…}가 주어질 때 大偏差定理와 이에 관련된 Erdo¨s-Re´nyi 法則의 完全한 형태가 이 二重數列에 대해서 各各 얻어짐을 보여 준다. In this paper, we show that when a generalized increment sequence {T_n,k:n=0,1…; K=1,2,…} of real-valued r.v.s constructed by the sequence {X_n:n=1,2…} of r.v.s is given, the full form of Large deviation theorems and related Erdo¨s-Re´nyi laws is obtained for this double sequence, respectively.
Limit theorems for partial sum processes of a Gaussian Sequence
Yong-Kab Choi, Kyo-Shin Hwang, Hee-Jin Moon, Tae-S 대한수학회 2004 대한수학회지 Vol.41 No.6
In this paper we establish limsup and liminf theoremsfor the increments of partial sum processes of a dependentstationary Gaussian sequence.
SELF-NORMALIZED WEAK LIMIT THEOREMS FOR A ø-MIXING SEQUENCE
Choi, Yong-Kab,Moon, Hee-Jin Korean Mathematical Society 2010 대한수학회보 Vol.47 No.6
Let {$X_j,\;j\geq1$} be a strictly stationary $\phi$-mixing sequence of non-degenerate random variables with $EX_1$ = 0. In this paper, we establish a self-normalized weak invariance principle and a central limit theorem for the sequence {$X_j$} under the condition that L(x) := $EX_1^2I{|X_1|{\leq}x}$ is a slowly varying function at $\infty$, without any higher moment conditions.
LIMSUP RESULTS AND A GENERALIZED UNIFORM LIL FOR AN LPQD SEQUENCE
Choi, Yong-Kab,Hwang, Kyo-Shin,Moon, Hee-Jin Korean Mathematical Society 2012 대한수학회지 Vol.49 No.2
In this paper we establish some limsup results and a generalized uniform law of the iterated logarithm (LIL) for the increments of partial sums of a strictly stationary and linearly positive quadrant dependent (LPQD) sequence of random variables.
Limit results on finite-dimensional gaussian random fields
Choi, Yong-Kab,Hwang, Kyo-Shin,Moon, Hee-Tin Elsevier 2006 COMPUTERS & MATHEMATICS WITH APPLICATIONS - Vol.52 No.3
<P><B>Abstract</B></P><P>In this paper, we establish some limit results on Csörgó-Révész-type increments combined with moduli of continuity for finite-dimensional Gaussian random fields under explicit conditions, via estimating upper bounds of large deviation probabilities on suprema of the finite-dimensional Gaussian random fields.</P>