피압수가 존재하는 연약점토지반 내에 연직배수재의 관입깊이에 따라 압밀거동에 미치는 영향

정성교,진현식,백승훈 동아대학교 건설기술연구소 1999 硏究報告 Vol.22 No.2

In the Yangsan area developed for housing complex the soft clay deposited as about 20 to 40 meters in thickness and there was the Artesian pressure of about 20kPa under the clay stratum. To investigate the consolidation behaviour due to partially or fully penetrating vertical drains in the clay layer, a finite element analysis was carried out in this study. As a result of analysis, it was shown that the consolidation rate and the final settlement for the case of fully penetrating vertical drains were faster and less than of partially penetration, respectively.

말기신부전 환자에서 심혈관계 합병증 예측인자로서의 호모시스테인의 의의

정종훈,신병철,김현리 朝鮮大學校 附設 醫學硏究所 2008 The Medical Journal of Chosun University Vol.33 No.2

Backgroud: Thromboembolic phenomena are major cause of morbidity and mortality in patients with end-stage renal disease (ESRD). In the last years, the accumulation of evidence coming from studies in patients with chronic renal failure have demonstrated an increased relative risk of coronary artery disease (CAD) in association with hyperhomocysteinemia. We elucidate the effects of homocysteine on diagnostic marker of cardiovascular risk factor of patients with ESRD. Methods: One hundred thirty-three patients were enrolled in the study performed at a Chosun university hospital. Ninety patients were on dialysis (58 hemodialyzed patients and 32 peritoneal dialyzed patients). Hyperhomocysteinemia was defined as a fasting plasma homocysteine level more than 15 μmol/L. Results: A total 71 patients (53.4%) had hyperhomocysteinemia. The prevalence of hyperhomocysteinemia was 60.3%, 46.9%, 48.8% among hemodialysis, peritoneal dialysis and kidney transplantation, respectively. CAD was present in 40.6% of patients (54 patients). The mean homocysteine concentration was 22.35 ± 5.94 μmol/L and 15.07 ± 5.45 μmol/L in patient with (n=54) and without (n=79) CAD, respectively (p<0.01). There was significant difference including age, serum creatinine, cardiac troponin-T (cTn-T), homocysteine level, total cholesterol, CRP in the two group (p<0.05). Plasma homocysteine concentration showed significant positive correlations with age (r= 0.261, p<0.05), cTn-T (r= 0.244, p<0.05), CRP (r= 0.422, p<0.01) in overall and negative correlations with hemoglobin (r= -0.240, p<0.05) in dialysis patients. Conclusion: Hyperhomocysteinemia, elevation of cTn-T, and elevation of CRP were diagnostic markers of ischemic heart disease of ESRD patients undergoing hemodialysis and peritoneal dialysis. The homocysteine is more potential diagnostic marker than cTn-T and CK-MB in ischemic heart disease with ESRD patients.

파킨슨씨병 환자에 있어서 자가부신수질 이식술

정상섭,박상근,오성훈,김선호,윤도흠,박정수,양우익,최인준,안영수,김경환,박창일,김진수,이현철 대한신경외과학회 1988 Journal of Korean neurosurgical society Vol.17 No.6

Recent experimental studies and clinical cases have suggested that grafting tissue from the adrenal medulla into the brain may alleviate the symptoms of Parkinson's disease. Autologous adrenal medullary grafts into the striatum was performed stereotactically in two patients with Parkinson's disease. Both patients were bedridden preoperatively, but 4 months after the surgery both became ambulatory and one was even capable of returning to his job. Even though the number of cases was small⑵ and the follow-up period was short, this study shows that adrenal medullary transplantation into the striatum may have some beneficial effects in patient with Parkinson's disease. Further experimental and clinical trials are necessary to see whether this procedure will be a recommendable surgical treatment for patients suffering from Parkinson's disease.

판형 열교환기의 열유동 해석

玄淸男,李相勳 홍익대학교 산업기술연구소 2002 産業技術 Vol.12 No.-

In this study, the heat transfer coefficient and heat stress and the flow characteristics according to the shape of pipe interior in Plate Heat Exchanger is studied by a numerical method using Design-Space. One of the most common heat exchangers that is mainly attached in vehicles is studied. Analysis is performed by comparing the results for plate heat exchangers with those for cylinder heat exchangers. In order to increase the effectiveness of heat exchangers, thermal conductiom, material, and thermal stresses in plate heat exchangers are investigated.

한국 전통 발효식품 중의 Ethyl Carbamate 정량

정현정,권훈정 동아시아식생활학회 1997 동아시아식생활학회지 Vol.7 No.1

Diet is generally accepted as one of the important factors in human cancer development. Ethyl carbarmate has been associated with cancer for several decades and mainly found in the fermented beverages and foodstuff. The relationship between ethyl carbarmate and the human health cannot be ignored especially in the areas where fermented foods consists of regular food consumption. To investigate the ethyl carbamate exposure level in Korean population, commercial fermented food samples were collected from local markets in Seoul area and home-made varieties were collected throughout the country. Following partial purification, the concentration of ethyl carbamate was determined by GC/MS. The concentration of ethyl carbamate ranged to 70 ppb in soysauce, to 10 ppb in soybean paste, and to 5 ppb in vinegars. Korean traditional alcoholic beverages showed small amount of ethyl carbarmate. The estimated daily exposure of Korean population was 0~1900ng/day. It would be prudent to put efforts to minimize the formation of ethyl carbamate since the risk from the higher range exposure cannot be ignored.

문신치료의 실험적 연구

張忠鉉,李斗炯,陳世勳 大韓成形外科學會 1987 Archives of Plastic Surgery Vol.14 No.1

In general social opinions of developed cultural state, tattoos induced psychological and social problems. Since Hellenic times, the removal of unwanted tattoos has been a challenge: for example, salabrasion, dermabrasion, LASER surgery, skin graft and cryosugery, etc. But the availability of manay methods for the removal of tattoos appears to indicate that there is no one absolute method. So we studied macroscopical color changes and microscopical histological changes in tattooed rabbits and rats, and overtattooed rabbits and rats. The results were as following: 1. Inflammatory reactions was nearly almost disapperared within 3 weeks. 2. The major fade―out of tattooed color was occurred from post―tattooing 5 days to 3 weeks. 3. Dye particle was located mainly in upper & mid dermis and it was not relafted with tattooing depth. 4. Masking effect of black colored tattoos was definitely improved in the overtattooing group. But complete masking was impossible.

상아질 접착제의 중합 시간 조절에 따른 복합레진의 중합 수축 방향의 변화

배지현,오명환,김창근,손호현,엄정문,조병훈,권혁춘 대한치과보존학회 2001 Restorative Dentistry & Endodontics Vol.26 No.4

The purpose of this study was to evaluate the effect of adhesive curing timing on the direction of polymerization shrinkage of light-curing composite resin. In this study, the curing times of adhesive and composite resin were measured by differential scanning calorimeter(DSC). 28 extracted human molars were embedded in clear resin and box-type cavities were prepared. Based on DSC data. the experimental teeth were divided into 4 groups. Group 1: no bond: Group 2: late curing: Group 3: Intermediate curing: Group 4: Early curing. After treating with adhesive, the buccal cavities were filled with Z-100 hybrid composite resin and the lingual ones were filled with AEliteflo flowable composite resin. The depressions at the surface were measured by surface profilometer, then the specimens were embedded in clear resin and sectioned. Impressions were obtained and used to get epoxy resin replicas. The epoxy replicas were gold-coated and observed under SEM. Average Maximum Gap(AMG), Gap Proportion(GP), Average Marginal Index(AMI) were used to compare the shrinkage gap of each group. The results were statistically analyzed using the Kruskal-Wallis One Way ANOVA, Student-Newman-Keuls method. The results of this study were as follows. 1. Average Maximum Gap. Gap Proportion, Average Marginal Index and depression at the surface of Z-100 hybride composite resin were smailer than those of AEliteflo flowable composite resin(P(0.05) 2. When the bonding between composite resin and tooth structure was strong, the shrinkage gap was small, and depression at the surface was deep(P<0.05). 3. In the well-bonded group. light-curing composite resin shrank toward bonded cavity wall. not toward light source. The result suggested that the direction of polumerization shrinkage was affected by the quality of bonding in the dentin-resin interface. The strong was the bonding between composite resin and tooth structure, the smaller was the gap and the deeper was the depression at the surface. Then the flow to compensate the polymerization shrinkage proceeded from surface to bonded cavity wall.

우리나라 하수 및 폐수 처리 슬러지의 유기인계 살충제의 함량

홍기훈,이강영,정창수,이현경 한국환경과학회 2006 한국환경과학회지 Vol.15 No.3

유동성 및 응축성 복합레진의 점탄성에 관한 유변학적 연구

조병훈,이인복,권혁춘,손호현,엄정문 대한치과보존학회 2000 Restorative Dentistry & Endodontics Vol.25 No.3

The purpose of this investigation was to observe the viscoelastic properties of five commercial flowable(Aeliteflo, Flow it, Revolution, Tetric flow, Compoglass flow) , three conventional hybrid(Z-100,Z-250,P-60) and two condensable(Synergy compact, SureFil) resin composites. A dynamic oscillatory shear test was done to evaluate the storage shear' modulus (G' ) , loss shear modulus(G") , loss tangent(tan δ) and complex viscosity(η* ) of the resin composites as a function of frequency dynamic frequency sweep test from 0.01 to 100 rad/s at 25℃ - by using Advanced Rheometric Exparusion SystemtARES) . To investigate the effect On the viscosity of resin composites of filler volume fraction, the filler weight % and volume % were measured by means of Archimedes' principle using a pyknometer. The results were as follows 1.The complex viscosity η* of flowable resins was lower than that of hybrid resins and significant differences were observed between brands. The complex viscosity η* of condensable resins was higher than that of hybrid resins. The order of complex viscosity η* at ω = 10 rad/s was as follows. Surefil, Synergy compact, P-60, Z-250, Z-100. Aeliteflo, Tetric flow, Compoglass flow, Flow it, Revolution. The relative complex viscosity of flowable resins compared to Z-100 was 0.04-0.56 but Surefil was 30.4 times higher than that of Z-100. 2.The storage shear modulus G' and the loss shear modulus G" of flowable resins were lower than those of hybrid resins but those of condensable resins were higher. The patterns of the change of loss tangent, tan δ of resin composites with increasing frequency were significantly different between brands.The phase angles,δ, ranged from 30.2-78.1˚at ω = 10 rad/s. 3.A11 composite resins represent pseudoplastic nature with increasing shear rate. 4.The complex shear modulus G* and the phase angle δ was represented by the frequency domain phaser form, G*( ω )= G* eIδ = G*〈 δ. The locus Of frequency domain phaser plots in a complex plane was a valuable method that represent the viscoelastic properties of composite resins. 5.There was no direct linear correlationship but a weak positive relation was observed between filler volume % or weight % and the viscosity of the resin composites.

施肥條件이 사탕무의 生育과 Betacyanin 含量에 미치는 影響

金度勳,朴賢眞,金賢勍,鄭大守 東亞大學校生命資源科學大學附設 農業資原硏究所 1996 農業生命資援硏究 Vol.5 No.1

사탕무의 生育과 betacyanin 含量의 變化에 대한 施肥條件의 影響을 알아보기 위하여 室素 0, 10, 15 및 20㎏/10a와 加里 0, 10, 15 및 20㎏/10a 處理하여 試驗한 結果는 다음과 같다. 草長과 葉數는 室素 15㎏/10a 處理區까지는 增加되었으나, 20㎏/10a 處理區에서는 오히려 減少되었으며, 根直徑과 根長도 室素 施用量의 增加에 따른 有意的인 差異가 認定되었다. 그리고 根重은 無處理區에 비해 室素 處理區에서 增加되었으나, 室素 處理區間에는 큰 差異를 나타내지 않았다. Betacyanin 含量은 室素 15㎏/10a와 加里 20㎏/10a 處理區에서 0.126%로 가장 높았고, 生育段階別로는 파종후 110日에 가장 높은 含量을 나타내었다. These experiments were carried out to investigate the effect of nitrogen and potassium application on growth and betacyanin content of sugar beet. The experiments were respectively treated with 0, 10, 15 or 20㎏/10a nitrogen and 0, 10, 15 or 20㎏/10a of postassium, and the results were summarized as fellows. Plant height and number of leaves were increased by 15㎏/10a of nitrogen, otherwise; it was decreased by 20㎏/10a of nitrogen. There were significant differences root diameter and root length by increament of nitrogen application. Root weight was progressively increased by nitrogen treatments compared to the control, although there was no significant differences among the amount of nitrogen treatments. Betacyanin content was high 0.126% in the plot treated with 15㎏/10a of nitrogen and 20㎏/10a of potassium respectively. For the growth stage the corresponding value showed the highest level at the 110th day after seeding.