정헌 고인석 교수 정년퇴임기념호 / 경희한약개발연구소편 : 신석의 간장독작용과 감초의 해독에 관한 연구

류경수(Kyung Soo Ryu),김명회(Myung Hoe Kim) 경희대학교 동서약학연구소 1986 경희약대 논문집 Vol.14 No.-

신·재생에너지 자원으로 유기성 폐기물 재활용

김경회 대구대학교 산업기술연구소 2014 産業技術硏究 Vol.25 No.1

In view of new·renewable energy and the recycling of waste resources, this SIG study suggests that fry-drying technique using boiling heat transfer can convert yearly increasing organic wastes to solidified fuel source. Solidified fuel from organic wastes can be produced from lab-scale batch reactor and pilot-scale continuous process, its calorific value shows good quality ranging from 5,000 to 5,500 ㎉/㎏ and the advantage of low cost fuel can also be made through mass production.

健康資本模型에 의한 家計 保健醫療費 支出의 時系列分析 : A Health Capital Approach 價格彈力性과 支出彈力性의 推定

李會京,孔文基 韓國計量經濟學會 1997 계량경제학보 Vol.8 No.-

본 論文은 家計 保健醫療費 支出의 결정과정을 生涯週期이론에 근거한 健康資本모형으로서 분석한다. Grossman의 모형을 일반화시킨 消費支出과 保健醫療費 支出의 동시결정모형은 不安定한 시계열 간에 장기적으로 안정적인 관계인 共積分制約이 존재함을 함의하며, 共積分回歸분석을 통해 保健醫療費 支出의 價格彈力性과 支出彈力性을 추정할 수 있다. 韓國의 도시가계 조사 자료를 이용한 실증분석결과, 家計 保健醫療費 支出은 健康資本모형에 의하여 설명될 수 있으며, 비탄력적인 價格彈力性과 支出彈力性을 얻었다. 특히 1970년대 후반부터 안정적인 값을 나타내는 彈力性값은 全國民醫療保險制度下에서의 超過需要와 誘因需要의가능성, 家計部門에 비해 상대적으로 낮은 公共部門의 역할 등에 기인하는 것으로 추정된다.

강건 설계를 이용한 전자제품 신뢰성 향상방법

김경모,이지수,신호균 金烏工科大學校 1997 論文集 Vol.18 No.-

Reliability is one of the important quality factor in electronic products. As it is time-consuming to estimate mean time to failure, it has not been integrated in the process of product design. In this study, we propose a method which can optimize the product with respect to robustness design and can estimate mean time to failure of electronic products by only one experimentation. This proposed method can quarantee quality improvement by making the life time of the designed products robust to customer's environment. We explaine the detailed steps of this proposed method through a case study.

구강악안면영역의 3차원 CT 영상 재형성시 역치 및 불투명도에 대한 연구

최문경,이삼선,허경회,이원진,최순철 대한구강악안면방사선학회 2009 Imaging Science in Dentistry Vol.39 No.1

Purpose : This study was designed to determine a proper threshold value and opacity in three-dimensional CT volume rendering of oral and maxillofacial area. Materials and Methods : Three-dimensional CT data obtained from 50 persons who were done orthognatic surgery in department of oral and maxillofacial radiology of Seoul National University retrospectively. 12 volume rendering post-processing protocols of combination of threshold (100HU, 150HU, 221HU, 270HU) and opacity (58%, 80%, 90%) were applied. Five observers independently evaluated image quality using a five-point range scale. The results were analyzed by receiver operating characteristic curves, ANOVA and Kappa value. And three oromaxillofacial surgeons chose the all images that they thought proper clinically in the all of images. Results : Analysis using ROC curves revealed the area under each curve which indicated a diagnostic accuracy. The highest diagnostic accuracy appear with 100HU and 58% opacity. and the lowest diagnostic accuracy appear with 221HU and 58% opacity that are being used protocol in department of oral and maxillofacial radiology of Seoul National University. But, no statistically significant difference was noted between any of the protocols. And the number of proper images clinically that chosen by three oromaxillofacial surgeons is the largest in the cases of protocol 8 (221HU, opacity 80%) and protocol 11 (270HU, opacity 80%) in one after the other. Conclusion : Threshold and opacity in volume rendering can be controled easily and these can be causes of making an diagnostic accuracy. So we need to select proper values of these factors.

경정배양에 의한 카네이션(Dianthus caryophyllus L.)의 기내증식과 순화

양회형,조경철,김광수,황인택 全南大學校 農業科學技術硏究所 1999 農業科學技術硏究 Vol.34 No.-

본 실험은 카네이션의 경정배양을 통한 기내증식체계를 확립하고 기내증식과정 중 발생하는 투명묘의 발생을 억제하기 위하여 실시하였으며, 발근과 순화과정을 통합함으로써 그에 따르는 경비와 노동력을 절감할 수 있는 방안을 마련하는 한편, 기내에서 얻은 묘를 직접 재배에 이용할 수 있는 방법을 개발하기 위하여 실시하였다. 경정배양에서 생존율은 Benzyladenine (BA) 또는 Kinetin (KI) 0.1㎎/ℓ 첨가한 모든 배지에서 80%이상이었으나 그 이상의 농도에서는 농도가 증가할수록 생존율이 감소하였으며, Naphthaleneacetic acid (NAA) 또는 Indoleacetic acid (LAA) 0.1㎎/ℓ 혼합첨가시에는 2.0㎎/ℓ까지는 농도에 관계없이 모든 처리구에서 생존율이 75%이상이었다. 경정배양에서 얻은 신초의 증식배양에서 LAA나 NAA의 첨가에 관계없이 KI보다 BA를 첨가하면 신초발육이 더 좋았다. MS배지의 무기염류를 4배로 첨가한 4MS배지에서는 신초가 모두 고사하였고, 1 MS배지에서 신초의 발육이 가장 좋았다. Sucrose 무첨가 배지에서 신초의 발육이 가장 좋았다. Sucrose 무첨가 배지에서 신초의 발육은 거의 이루어지지 않았고, sucrose 20㎎/ℓ첨가배지에서 신초의 발육이 가장 좋았다. 한천보다 겔라이트 첨가배지에서 신초의 발육이 좋았다. 배지 pH는 5.0에서 신초의 발육이 가장 양호하였다. 투명화묘의 발생은 경정배양과 계대배양 전과정에서 발생하였고, 한천 또는 겔라이트의 농도를 높여주었을때에 억제되었다. 발근 및 순화단계에서 신초의 발육과 근형성은 sand, vermiculite배지에서 보다 perlite배지에서 더 좋았다. This study was carried out to establish a system for clonal multiplication and preventing vitrification in shoot tip culture of carnation. Combining the two steps of rooting and acclimatization, it may possibly reduce the cost and save the labor for clonal propagation. In addition, the plantlets raised by this one step rooting and acclimatization could be directly transferred to soil. The survival rate was over 80% in the media containing 0.1㎎/ℓ benzyl-adenin (BA) or kinetin (KI), but decreased as the concentration increased. When auxins were added in combination with cytokinins, the survival rate was over 75% regardless of the cytokinin concentration up to 2.0㎎/ℓ. When the in vitro shoots were subcultured, shoot development was better in the media containing BA than those containing KI regardless of addition of indoleacetic acid (LAA) of α-naphthalene acetic acid (NAA). Shoot development was the best in the standard MS medium(1xMS), while all the shoots on the medium containing 4 times the inorganic salts of MS medium(4xMS) died. Shoot development in MS medium free of sugar was not noticed. The MS medium containing 20g/ℓsucrose resulted in the best shoot growth. Shoot development was better on the media containing gelrite than those containing agar. The MS medium at pH 5.0 favored the shoot development. Vitrification of shoots occurred during the initial shoot culture as well as during the subculture of the in vitro shoots, but it was suppressed when the concentration of gelrite or agar in the media was increased. As the substrate for rooting and acclimatization of the in vitro shoots, perlite was better than sand or vermiculite.

일부지역의 암발생 특성에 관한 조사연구(2)

민경진,강희양 韓國保健敎育學會 1991 보건교육건강증진학회지 Vol.8 No.1

Cerebrovascular disease have been replaced by neoplasm as first cause of death on 1980's. So, many epidemiological studies on cancer have been reported. However, most of them were performed on bests of biopy data or of histological examination. We had reported that valuable results could be obtained from surgical data for cancer patients, previously. In this paper, 5,103 surgically treated cancer patients in Daegu-Kyungbuk area during 1985-1989 were analyzed in terms of sex age and organ. Mean age on male cancer patients was increased, but in the case of female, the trend of age distribution is inverse to other reports. It is considered as regional specificity to cancer incidence and it is due to higher frequency of breast and uterine cervical cancer than other areas. Especially, in the case of breast cancer, the mean age of patients was 30's and be considered as most dangerous cancer to female.

갈바니식 산소센서의 납 산화전극 재료

이경재,박면용,조동희,정성숙,박선영 建國大學校基礎科學硏究所 1993 理學論集 Vol.18 No.-

갈바니식 산소센서용 산화음극재료의 연구에 순수한 납, 납-안티몬, 납-안티몬-주석, 납-칼슘의 합금을 사용하였다. 그중에서 납-안티몬 합금이 4M 수산화나트륨 용액중에서 가장 큰 포화전위를 5분안에 나타냈다. 4M 수산화나트륨 용액에 소량의 피로갈롤을 첨가하면 2분안에 포화전위에 도달하는 빠른 응답을 나타냈다. The pure lead, lead-antimony, lead-calcium and lead-antimony-tin aollys have been studied to use as an anodic materials of galvanic oxygen sensors. Among tested materials lead-antimony alloy was shown the highest saturated potential in 4M potassium hydroxide solution and in five minutes. Pyrogallol solution in 4M potassium hydroxide was shown rapid response to be reached the saturated potential in two minutes.

BPDA-MDA Polyimide 표면특성 평가

김경회,김혜숙 한국공업화학회 2005 응용화학 Vol.9 No.1

The behavior of dielectric material and manufacturing process of polyimide can be optimized by understanding relationship between surface chemistry and the wettability of polyimide. A general and useful method to predict the wettability of polyimide is to measure contact angle, which provides the information on surface tension, morphology and heterogeneity of the surface of polyimide. This research improves the existed repetitive and inexact method of measuring contact angle, and the improved measurement of contact angle can be reproducible and exact by capturing the image of the sessile drop on BPDA-MDA polyimide film and analyzing the image quantitatively. All nonpolar liquids of alkane homologues easily spread on the the surface of BDPA-MDA polyimide. On the other hand, polar or hydrogen-bonding liquids form a certain angle on the surface of BPDA-MDA polyimide. Critical surface tension of BPDA-MDA polyimide estimated from Zisman plot is smaller than that calculated from the plot of 1+cosθ vs. 1/γ_(L)^(0.5) plot or the plot of log (1+cosθ ) vs. logγ_(L) plot.

돼지 하악골의 micro-CT 영상에서 추출한 3차원 골미세구조와 골강도 사이의 상관관계

허경회,박무순,이원진,허민석,이삼선,최순철 대한구강악안면방사선학회 2005 Imaging Science in Dentistry Vol.35 No.3

Purpose : To investigate the relationship between three-dimensional (3D) bone imaging parameters and trabecular strength in the mandible. Materials and Methods : Bone specimens were obtained from the mandibles of five male pigs weighing around 110 kg each. Of those, 43 samples were selected for 3D analysis and measured by micro-computed tomography. The five morphometric parameters were trabecular thickness (Tb.Th), bone specific surface (BS/BV), percent bone volume (BV/TV), structure model index (SMI) and degree of anisotropy (DA). Through destructive mechanical testing, strength parameters were obtained. Results : BV/TV, SMI, BS/BV, and Tb.Th showed significant correlations with strength parameters. DA did not show any correlation with the other parameters. In multiple linear regression analysis, BV/TV alone explained 43% of the variance in Young’s modulus. By stepwise inclusion of SMI, the variance in the Young’s modulus was better explained up to 52%. Conclusions : Predicting trabecular strength in the mandible through architectural analysis would be possible. Further study is needed to establish the tendency and variety of trabecular architecture and strength according to the locations within the mandible.