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김기정,이연희 서원대학교 학생생활연구소 1999 학생생활연구 Vol.17 No.-
This study is aimed to evaluate the effects of career exploration program on career decision level and identity of college students. Main activities of the program was consisted of 8 weeks sessions. Equivalent control group pretest-posttest design was employed for this study. 38 college students voluntarily participated in the group counseling of career exploration. Another 20 students were selected for the control group of this study design. Career Decision Scale(19 items) and Career Identity Scale(18 items) were administered to both of the experimental and the control groups before and after the 8 weeks treatments. The differences of posttest scores and pretest scores of the experimental group in both of Career Decision Scale and Career Identity Scale were compared with the those of control group in two scales. The results of the comparison showed that the differences(program effects) of experimental group in both scales were higher than those of control group. In conclusion, the career exploration program had significant effects on the career decision and identity of college students.
정은욱,지삼룡,이영태,박지훈,김동기,제인수,채두근,박성재,박은택,이연재,이상혁,설상영,정정명 白中央醫療院 2005 仁濟醫學 Vol.26 No.1
Afferent loop syndrome is an uncommon complication of a gastrectomy and Billroth Ⅱ reconstruction. It may cause symtoms at any time from the first postoperative day to many years after the gastrectomy. Afferent loop syndrome is characterized by abdominal pain, vomiting and elevation of serum amylase. Thus, it is difficult to differentiate afferent loop syndrome from other cause of acute pancreatitis. However, the history of gastrectomy can be an important clue for diagnosing afferent loop syndrome. We experienced one case of chronic afferent loop syndrome with acute pancreatitis. After appropriate management, the abdominal pain disappeared and serum amylase level decreased. We report this case with a review of relevant literatures.
The least-squares meshfree method for rigid-plasticity with frictional contact
Kwon, Kie-Chan,Youn, Sung-Kie Elsevier 2006 International journal of solids and structures Vol.43 No.25
<P><B>Abstract</B></P><P>The least-squares meshfree method (LSMFM) for rigid-plasticity based on <I>J</I><SUB>2</SUB>-flow rule and infinitesimal theory is proposed. In the least-squares formulation the squared residuals of the constitutive and equilibrium equations are minimized. Those residuals are represented in a form of first-order differential system using the velocity and stress components as nodal unknowns and thus the proposed formulation is a mixed-type method. Also the penalty scheme for the enforcement of the boundary and frictional contact conditions is devised and the reshaping of nodal supports is introduced to avoid the difficulties due to the severe local deformation near the contact interface. The proposed method does not require any structure of extrinsic cells for the construction of shape functions, the treatment of incompressibility, the integration of variational formulation and the reconstruction of approximation. Through some numerical examples of metal forming processes, the validity and effectiveness of the method are discussed.</P>
Topology optimization using spline finite element method and trimmed surfaces
Sung-Kie Youn,Yu-Deok Seo,Hyun-Jung Kim 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.3
In the present work, a new topology optimization based on spline finite element method(FEM) and trimmed spline surfaces is proposed. For a new topology optimization based on spline FEM, trimming techniques are employed to represent arbitrary complex topologies in spline surfaces. Trimmed surface analysis which uses trimming information of trimmed surfaces for numerical analysis is employed to treat topologically complex spline surfaces. The boundaries are optimized by changing the positions of control points of the surface and those of trimming curves. As a reasonable measure for topological change, the selection criteria, which are defined by the ratio of the sensitivity on an objective function to that on a constraint, are employed for creation of a new inner front. Inner front merging algorithm is also implemented for high topological flexibility in the proposed approach. The proposed spline based topology optimization is demonstrated by applying some benchmarking problems.
Estradiol과 Medroxyprogesterone Acetate가 골아세포의 성장에 미치는 영향
김기석 ( Kie Suk Kim ),민부기 ( Bu Kie Min ),홍기연 ( Gi Youn Hong ),박승택 ( Seung Taek Park ),이승필 ( Seung Phil Lee ),김인숙 ( In Suk Kim ) 대한폐경학회 2001 대한폐경학회지 Vol.7 No.1
N/A This study was designed to clarify the hormonal effect on the growth of osteoblast. And the osteoblasts from neonatal mouse were cultured in the medium at various concentrations of 17β-estradiol(EST), medroxyprogesterone acetate(MPA) in addition 10nM of dexamethasone(DMS) and alcohol for 48 hours. And in order to detect the response of osteoblast on the those hormones, the alkaline phosphatase(ALP) activity also was measured. 1. At 48 hours after culture of osteoblasts in media at various concentrations of hormones, EST has an effect on increasing of the cell number in fashion of dose dependent, whereas MPA did not increase the cell number. 2. Dexametasone significantly promoted differentiation of osteoblasts does dependently with increasing of ALP activity. 3. In osteoblasts culture in media supplemented with alcohol in the absence of 10nM DMS, EST increased significantly ALP activity, while decreased ALP activity of osteoblast in the presence of DMS, 4. In culture of osteoblasts treated with alcohol in the absence of 10nM DMS, MPA did not show any change of ALP activity. But in the presence of DMS, MPA decreased ALP activity of osteoblast. 5. EST plus MPA stimulated the ALP activity in osteoblasts treated with alcohol in the absence of DMS. While, in the cells treated with DMS, they synergistically decreased ALP activity.
인간 난관세포와의 체외 공동배양과정에서 혈소판 활성요소가 생쥐배의 발달에 미치는영향
민부기,김기석,이희섭,홍기연,김흥곤,신무철,이찬근,최은하,Min, Bu-Kie,Kim, Kie-Seok,Lee, Hee-Sup,Hong, Kie-Youn,Kim, Heung-Gon,Shin, Mu-Cheol,Lee, Chan-Kun,Choi, Eun-Ha 대한생식의학회 1996 Clinical and Experimental Reproductive Medicine Vol.23 No.1
There are a number of problems during the process of culture in vitro on fertilization and embryo development compared to those on in vivo counterparts. And the platelet activating factor (PAF), which is found not only in mammalian spermatozoa but also preembryos, is implicated on reproductive process. To improve the environment of culture on in vitro fertilization and embryo development, coculture using salpingeal epithelial cells has been considered to accept the better result on pregnancy rate. This study was designed to determine if two different culture systems, coculture alone and PAF treated coculture, are positive or negative influence on process of in vitro fertilization and embryo culture in mouse. The cell cleavage rate reached to 2-4 cell stage at 24 hours of culture is 56.81% (50/88) and 48.21%(54/112) respectively, in PAF treated group which is added PAF on coculture and in coculture group. But the rate of cells cleavage was similar in both group after 48 hours of culture. The rate of unfertilization after insemination of oocytes was higher in coculture group(55..53%) than in PAF treated group(42.37%). And in assessment of undeveped embryos, the rate of equalized cell block was similar on both, coculture alone (35.3%)and PAF treated coculture(35.5%). while unequalized cell block was higher rate in PAF treated coculture(19.4%) than coculture alone (11.8%). But the rate of cytoplasmic degeneration of undeveloped embryos was significantly higher in PAF treated coculture than coculture alone. In conclusion, we have observed that PAF treated coculture is superior in the rates of in vitro fertilization and early embryo cell cleavage compared to those in coculture alone, but there is no difference on the rates of embryo develpments, cell degeneration, cell quality in both PAF treated coculture and coculture alone when the embryo cells were continuosly cultured for 48 hours or more.