洛東江 河口의 土質特性에 관한 調査硏究

이영대,인교동 釜慶大學校 2000 釜慶大學校 論文集 Vol.5 No.-

Data obtained from the subsurface exploration in Nak-dong river basin have been analyzed to characterize the general patterns of the soil strata and soil characteristics of soft ground. The soft soil is widely distributed over the entire plain adjacent to the Nak-dong river including the deltaic area in the mouth of a river. The soft clay layer is located below the top sand layer and it is sometimes found below the bottom sand layer in some restricted areas. The physical characteristics in the alluvial layer exhibited a widely scattered distribution and no clear pattern. The natural water content increased from the surface and reached it maximum value at the depth of 20m and thereafter it tended to decrease with depth. The unit weight showed a similar pattern to the natural water content. The soil was classified as CL or CH according to the unified soil classification system. The mechanical characteristics showed a tendency to increase with depth whereas the undrained shear strengths did not. The distribution of sensitivities of the soft clay showed no relation with depth. The values of overconsolidation ratio were distributed widely depending on the site but most of them were concentrated between 0.8 and 1.0 The values of compression index ranged between 0.2 and 1.2 but they showed great differences in the same area.

약물 유해반응 보고지침 -임상시험의 안전성에 관한 정보 관리지침 -

지동현,김훈교,배진우,손동렬,김인범,전용관,박혜연 大韓臨床藥理學會 1998 臨床藥理學會誌 Vol.6 No.2

TEOS/O₂플라즈마 반응기에서 미립자 성장에 대한 실험적 분석

김동주,김교선 江原大學校 産業技術硏究所 2001 産業技術硏究 Vol.21 No.B

A study on the particle growth in TEOS/O2 plasma was performed, and particle size and its distribution was measured by the electrical aerosol analyzer (EAA), light scattering particle size analyzer and the particle size was also determined by SEM, the effects of process variables such as total gas flow rate, reactor pressure, supplied power and initial reactant concentration on the particle growth were investigated. From the EAA results, the particle size distribution is divided into three groups of the cluster size and the small and large size particles. The particle size distribution measured by the light scattering particle size analyzer becomes bimodal, because the cluster size particles smaller than 20nm in diameter cannot be detected by the light scattering particle size analyzer. The size of particles measured by the light scattering particle size analyzer is in good agreements with those by the SEM. Also we could understand that the particle formation is very sensitive to the changes of reactor pressure and reactant concentration. As the total gas flow rate increases, the particle size deceases because of the shorter residence time. As the reactor pressure, or the reactant concentration increases, the particle concentration increases and the particles grow more quickly by the faster coagulation between particles.

지체장애인의 운동 참가 수준이 신체적 자기개념에 미치는 영향

구교만,김경숙,안동영 한국스포츠리서치 2005 한국 스포츠 리서치 Vol.16 No.2

The purpose of this study was to effect of sport participation level on physical self-concept of physical disabilities. The subjects of this study were selected by the stratified random cluster sampling method from physical disabilities corporation. welfare facilities. welfare center in Seoul or Kyonggydo. The data for this study are collected from 176 questionnaires which are answered by the disabled. The questionnaires of this study were used PSDQ(Physical Self-Description Questionnaire) invented by Marth & Richards(1991). which were translated by Yong-kuk Kim. The statistical methods utilized in this study for analyzing the collected data were descriptive statistics, analysis of variance, multiple correlation analysis, one-way ANOVA. From the analyses of data, this study reached following conclusions: Firstly. physical self-concept of physical disabilities were different along with intensive sport participation. Secondly. physical self-concept of physical disabilities were different along with long sport participation.

Turbo-PROLOG를 이용한 전문가시스템 쉘의 원형개발

이동만,서창교,이영숙 慶北大學校出版部 1993 經商論集 Vol.21 No.3

세균독소로 자극시킨 사람 섬유아 세포에서의 Interleukin-6와 Interleukin-8의 생성

정인교,양동규,홍시영,이성근,김욱규,김광혁,김종렬 大韓顎顔面成形再建外科學會 1999 Maxillofacial Plastic Reconstructive Surgery Vol.21 No.4

Cytokines are hormone-like proteins which mediate and regulate inflammatory and immune responses. Interleukin-6 (IL-6) is involved in the final differentiation of B cells into antibody-producing cells. Interleukin-8 (IL-8) is a neutrophil chemotactic factor that plays an important role in the recruitment of neutrophil to inflammatory loci. Inflammatory mediators by cells in the gingiva have been implicated in the initiation and progression of periodontitis and oral infection. The purpose of this study was conducted to investigate the effect of lipopolysaccharide (LPS), staphylococcus enterotoxin B (SEB) on production ofIL-6 and IL-8 by human gingival and facial dermal fibroblasts. Primary cultured human gingival and facial dermal fibroblasts were incubated with LPS(0.01, 0.1, 1.0㎍/ml), SEB (0.01, 0.1, 1.0㎍/ml) or LPS (0.1㎍/ml) plus SEB (0.1㎍/ml). Culture supernatants were collected at 24, 48, and 72 hrs and assessed for IL-6 and IL-8 production by enzyme-linked immunosorbent assay. IL-6 production in gingival fibroblasts stimulated with LPS was higher than that with SEB. IL-6 production by double exposure with LPS plus SEB was amplified in comparison with single exposure of LPS or SEB. IL-6 production in facial demal fibroblasts was increased only by stimulation with a high concertration of LPS (1.0㎍/ml). Its production in facial dermal fibroblasts by exposure with SEB was decreased in comparison with control, nontreated cells. Therefore, gingival fibroblasts showed higher sensitivity than facial dermal fibroblasts in response to low concentration of LPS. Also, IL-6 production by double exposure with LPS plus SEB was amplified in comparison with single exposure of LPS or SEB.IL-6 production in facial dermal fibroblasts was increased only by stimulation with a high concentration of LPS(1.0㎍/ml). Its production in facial dermal fibroblasts by exposure with SEB was decreased in comparison with control, nontreated cells. Therefore, gingival fibroblasts showed higher sensitvity than facial dermal fibroblasts in response to low concentration of LPS. Also, IL-6 production by double exposure with LPS plus SEB was amplified in comparison with single exposure of LPS or SEB. IL-8 production in gingival fibroblasts was enhanced greatly only by stimulation of high concentration of LPS (1.0㎍/ml). That by exposure with SEB was increased only in 24 hrs cultivation. IL-8 production by double exposure with LPS plus SEB was amplified in comparison with single exposure of LPS or SEB. IL-8 production in facial dermal fibroblasts was decreased by LPS and increased only in 48 hrs cultivation by SEB. IL-8 production by double exposure with LPS plus SEB was enhanced only in 48 hrs cultivation in comparison with single exposure of LPS or SEB. therefore, IL-6 and IL-8 production were released at various quantities according to bacterial toxin applied and site of fibroblast harvested. These results suggest that gingival fibroblasts may be concerned with IL-6 and IL-8 related inflammatory response more than facial dermal fibroblasts.

타이타늄의 표면개질에 따른 표면형태의 변화

손동환,김도균,김교한 대한치과기재학회 1998 대한치과재료학회지 Vol.25 No.2

The present study was investigated on the morphologic changes of Ti surface by the immersion in Hanks' solution and aqueous solutions containing calcium and phosphate ions in turns and the surface of the treated specimens were characterized by using SEM and XRD. Amounts of calcium phosphate apatite were increased by when immersed in aqueous solution containing calcium and phosphate after Hanks' solutes than when immersed in Hanks' solution only. Needle and plate-like apatites were observed when immersed in the solutions of weak acid and neutral condition, while granular multiple layers were seen in the solutions of weak alkali condition. The precipitations of calcium phosphate on Ti surface were increased by dilution in weak acid and weak alkali solution. On the other hand, amounts of precipitates in neutral solution were increased in non-diluted and 2 times diluted solution than 5 times diluted solution. The results of XRD showed that only Ti peaks were detected in N, Al conditions while peaks of brushite in A2, A3, B1, B2, B3, C1 conditions and peaks of synthetic hydroxyapatite were seen in C2, C3 conditions. For the precipitation of bioactive apatite, immersion in alkali solution is favorable by immersion method rather than neutral or acid solution.

실란 펄스 플라즈마 공정에서의 화학농도 변화

김동주,김교선 江原大學校 産業技術硏究所 2005 産業技術硏究 Vol.25 No.A

We investigated numerically the evolutions of several chemical species which are important for film growth and particle generation in the pulsed SiH₄ plasmas. During the plasma-on, the SiH_(x) concentration increases with time mainly by the generation reaction from SiH₄, but, during the plasma-off, decreases because of the hydrogen adsorption reaction. During the plasma-on, the concentrations of negative ions increase with time by the polymerization reactions of negative ions and those become almost zero in the sheath regions because of the electrostatic repulsion. During the plasma-off, the concentrations of negative ions decrease with time by the neutralization reactions with positive ions and some negative ions can diffuse toward the sheath regions because there is no electric field inside the reactor. The polymerized negative ions of higher mass can be reduced successfully by using the pulsed plasma process.

공정 변수 변화에 따른 실란 플라즈마내 음이온 특성

김교선,김동주 江原大學校 産業技術硏究所 1995 産業技術硏究 Vol.15 No.-

We have studied the generation and behavior of negative ions in silane plasmas. The negative ions were formed by homogeneous reaction in silane plasma and the behavior of negative ions were predicted by solving the model equations. The concentration profiles of negative ions were shown as a function of reactor length and time. The effects of process variables such as reactor pressure, flow rate and electrical field strengths on the behavior of negative ions were analyzed.

TiO₂가 코팅된 Polyethylene 입자를 이용한 페놀과 톨루엔의 광분해

김동주,최상근,조준형,김교선 江原大學校 産業技術硏究所 2004 産業技術硏究 Vol.24 No.B

The photodegradation of phenol and toluene with the Ti0₂-coated polyethylene (PE) particles were investigated in the slurry type photocatalytic reactor, changing the Ti0₂ particle sizes, initial phenol and toluene concentrations, and the oxygen flow rate. The nano-sized Ti0₂ photocatalyst particles were prepared by the diffusion flame reactor and they were coated onto PE particles by using the hybridization system for the efficient recollection of Ti0₂- coated particles after photodegradation experiments. The degradation efficiencies of phenol and toluene with the Ti0₂-coated PE particles were more than 90% after photodegradation of 80 minutes for most cases. The efficiencies of photodegradation with the Ti0₂-coated PE particles were found to be lower than those by the pure Ti0₂ particles by 50%, because of the decrease in specific surface area of Ti0₂ particles in PE particles.