공개키 기반 구조에서의 고속 인증 경로 탐색 서버의 설계 및 구현

이주남,유종덕,이구연 江原大學校 産業技術硏究所 2001 産業技術硏究 Vol.21 No.B

In the field of secure information systems including electronic commerces, public key infrastructure(PKI) is widely used for secure services. The more PKI domains are established, the more needs are required for cross-domain certifications. Furthermore, each country has many certificate authorities(CA) which require more complex cross certification. We may need a fast algorithm in order to find the possible certification paths. This will be more indispensible in the growing PKI systems. We designed and implemented the high-speed certification path discovery algorithm. Also, we investigated the feature of operation of the system.

플라이애쉬 콘크리트의 特性에 미치는 굵은 骨材 最大値數의 影響에 관한 實驗的 硏究

김덕현,유영주,이상수,송하영,김을용 한밭대학교 2004 한밭대학교 논문집 Vol.21 No.-

In this study, the experiment was carried out to investigate and analyze the influence of coarse aggregate's maximum size and Fly Ash replacements ratio on the properties of concrete. The main experimental variables were water/cement ratio 45 and 65(%), maximum size of coarse aggregate 15, 25 and 40(mm), Fly Ash replacements ratio 0, 10, 20(%). According to the test results, the principal conclusions are summarized as follows. 1) The slump and flow of fresh concrete were found to be higher in the order of maximum size of coarse aggregate 15, 25 and 40(mm), also in the order of Fly Ash replacements ratio 0, 10, 20(%). 2) The compressive strength of hardened concrete were found to be lower in the order of maximum size of coarse aggregate 15, 25 and 40(mm). While, Fly Ash replacements ratio increases in age 7days, showed tendency that compressive strength increases together. but, age 28, 56(day) were showed opposite tendency.

경골 원위부 골절 고정용 혼성 외고정 장치의 생역학적 분석 : 유한요소 방법을 이용한 연구

정덕영,김봉주,유석배,오종건 대한골절학회 2004 대한골절학회지 Vol.17 No.2

Emulsion型 液體膜에 의한 Toluene과 n-Heptane 混合物의 分離

金周德,鄭泰秀 成均館大學校 科學技術硏究所 1989 論文集 Vol.40 No.1

In the separation of toluene-n-heptane mixture by emulsion-type liquid membrane, studied were the effects of the following factors on the separation factor: surfactant concentration, stirring speed in emulsification, glycerol concentration and volume ratio of solvent to feed. The separation factor of toluene reached a maximum value at the surfactant concentration of 0.6 weight percent and contact time of 10 minutes. The separation factor increased with increasing stirring speed in emulsification, giving the greatest value at the contact time of 10 minutes. The separation factor of toluene reached a maximum value at the glycerol concentration of 0.6 weight percent and contact time of 10 minutes. The separation factor increased with increasing stirring speed in emulsification, giving the greatest value at the contact time of 10 minutes. The separation factor of toluene reached a maximum Value at the glycerol concentration of 30 weight percent. When the volume ratio of solvent to feed is equal to three, the permeation of toluene reached a maximum value.

마취 위험성이 높은 고령의 환자에서 엔더정을 이용한 대퇴 전자간 골절 치료

신주용,고덕환,김동옥,김동헌 대한골절학회 2004 대한골절학회지 Vol.17 No.2

대퇴골 전자간 골절을 동반한 고령의 환자에서 시행한 슬관절 전치환술

고덕환,김동헌,김규현,신주용,양준호 건국대학교 의과학연구소 2001 건국의과학학술지 Vol.11 No.-

Purpose: To analyze the clinical results of total knee arthroplasty In elderly patients who had arthritic knees and intertrochanteric fractures. Materials and Methods: From fan 1992 to March 1999, 27 cases of the patients with arthritic knees and associated intertrochanteric fractures were treated by total knee arthroplasties and we evaluated the patients by Knee Score of American Knee Society. Results: Flexion contracture was improved from 10.3 degree to 5.2 degree, KSS score was improved from 57.4 points to 78.6 points, authors' evaluation system score was improved from 50.3 points to 73.2 points. Conclusion: In elderly patients with arthritic knees and associated intertrochanteric fractures, total knee arthroplasty seemed to decrease the rehabilitation time and allow earl weight bearing, so provide an improvement in quality of life.

고령의 불안정성 대퇴 전자간 골절시 대퇴거 대치형 주대를 이용한 양극성 고관절 반치환술

고덕환,김규현,신주용,임신우,김동현 대한골절학회 2003 대한골절학회지 Vol.16 No.1

목 적 : 고령의 대퇴골 전자간 불안정성 분쇄골절시 대퇴거 대치형 주대를 사용하여 인공관절 치환술을 시행한 후 수술 시간, 보행 시기, 및 그 기능적 결과와 합병증을 분석하고자 하였다. 대상 및 방법 : 1991년 8월부터 2001년 1월까지 본원에서 대퇴 전자간 불안정성 분쇄골절로 수술받은 75세 이상 환자중 대퇴거 대치형 주대를 이용한 양극성 고관절 반치환술을 시행받은 후 2년 이상 추시가 가능하였던 환자 20례를 대상으로 하였다. 결 과 : 수술 시간은 평균 45분이었고, 임상적 결과 분석에서 Harris Hip Score는 평균 84.7점이었다. 사각보행의 시기는 평균 8일이었으며, 전체중 부하는 평균 6.9주였다. 합병증으로 수술부위 감염 2례, 고도의 대퇴부 동통 1례 및 탈구 1례가 발생하였다. 결 론 : 고령의 환자에서 발생한 대퇴 전자간 불안정성 분쇄 골절의 치료에 있어서 대퇴거 대치형 주대를 이용한 양극성 고관절 반치환술은 비교적 조기 체중부하와 기능적 회복이 가능하고 낮은 합병증으로 좋은 치료법의 하나로 사료된다. Purpose : The purpose of this paper is to analyze the operating time, timing of ambulation, functional results and complications using the calcar replacement stem for the severely comminuted unstable intertrochanteric fractures in the eldertly patients. Materials and Methods : From August 1991 through January 2001, 20 elderly patients over the 75 year old patients had undergone bipolar hemiarthroplasty with calcar replacement stem for the treatment of unstable intertrichanteric fractures. Results : The mean operating time was 45 minutes and mean Harris Hip Score was 84.7. Ambulation with walker was started at post-operative 8 days and full weight bearing was 6.9 weeks, each. Complications were 2 cases of wound infection, 1 case of severe thigh pain and 1 case of dislocation. Conclusion : Early ambulation, functional restoration and decrease of the complications with bipolar hemiarthroplasty using calcar replacement stem for severely comminuted unstable intertrochanteric fractures in elderly patients, therefore this methods seems to be one of the effective treatments.

釜山의 山村. 金城洞에 對한 地理學的 硏究

崔德柱 釜山敎育大學 1976 부산교육대학 논문집 Vol.12 No.2

Geunsung-Dong named Samsung-Ri in old times is located, at the altitude of 300-400 meters, on the side of Mt. Geumjung. The village has various mountainous characteristics. The climate of the village usually somewhat chilly all the year round except summer. The villagers chiefly cultivate rice-fields, but they always have a bad harvest becfause of the unfavourable weather. So they are mostly in want of food. In fact they have lived in the village since the Castle of Geumjungsan was built about 300 yers ago. The village which belongs to Busan city is famous for its traditional ancient houses. 1. In this village the growing of vegetables and the cattle raising will promise well for the future. 2. Many years ago, in this village were there many villagers who illegally made rice wine and yeast at home. 3. The number of visitors chiefly composed of mountaineers and barkeepers has gradually increased in this village. 4. The houses of this village which are low and surrounded by the stone walls resemble those of Jeju island. 5. Though buses regularly run in the direction of Dongrae, the village is still situated inconveniently. 6. The city of Busan has the plan of developing the villge as one of the sights of Busan. 7. The development of the village must be made under the preservation of natural surroundings and for the benefit of the villagers.

3 상유동층에서의 유동특성 및 물질전달에 관한 연구

김주봉,설수덕,장상목 동아대학교 공과대학 부설 한국자원개발연구소 1985 硏究報告 Vol.9 No.2

This study has been carried out to determine the hydrodynamic characteristics and mass transfer coefficient of NaOH solution in the three-phase fluidized bed. The effects of the superficial gas velocity, superficial liquid velocity, and the material of particles on the minimum fluidized velocity, phase holdup, volumetric liquid phase mass transfer coefficient and interfacial area were investigated The results were as follows, 1. The minimum fluidized velocity decreased with the superficial gas velocity. 2. The solid hold-up decreased with the superficial liquid velocity and gas velocity 3. The volumetric liquid phase mass transfer coefficient and interfacial area was increased with the superficial gas velocity, while was not effected by the superficial liquid velocity

이미지 검색을 위한 관심영역의 오소추출과 데이터 변환 연구

강문주,양동일,김덕은,최형진 강원대학교 정보통신연구소 2006 정보통신논문지 Vol.10 No.-

In this paper we designed the content-based image system. It discovers the characteristic value of color area for the existing image, when any user establishes the special interesting region for the question images. And we designed the system to be able to search the similar image of the interesting region, compared with the table that saved the characteristic value of moment which is unchangeable for the size and the rotation of from. In this paper, we suggest th image search model based on neural network. This is able to seek for the aimed image through the feedback to search the nonlinear relations by th method of searching content-based image using SOM neural network. We make use of the Precision and the recall that are used for the system evaluation using the similar matching method in general. As a result of the evaluation of the content-based image system, we can reduce the time and memory to find out the feature value of the image that is meaningless in the general images.