에멀젼型 液膜에 對한 數式모델 比較硏究

宋東益,崔相俊 慶北大學校 1983 論文集 Vol.36 No.-

Two diffusion-controlled mathematical models for emulsion-type liquid membrane, which were proposed by Lightfoot and Ho, and Ihm and Choi, were simulated by solving numerically the coupled moving boundary value problem using Crank-Nicholson implicit method and were compared with the batch experimental data obtained previously for removal of phenol from waste water. The results have shown that Lightfoot and Ho's model which was based on uniform mass transfer resistance inside the emulsion globules was not in good agreement with the experimental data especially at initial time period, but Ihm and Choi's model considering mass transfer resistances in the outer liquid membrane layer and in the inner reacted zone simulataneously, was fitted well the experimental data for nearly entire time period. Therefor, Ihm and Choi's model taking into consideration the outer mass transfer resistance layer of liquid membrane was thought to be more predictive and more precise than Lightfoot and Ho's one in the emulsion-type liquid membrane.

Platelet-Rich Plasma (PRP)가 토끼 척골의 분절 결손의 치료로 이식된 동종 장관골의 골유합에 미치는 효과

송주현,정진영,강용구,이한용,손문익,서상일 대한골절학회 2003 대한골절학회지 Vol.16 No.3

목적: 골종양 환자나 외상, 골수염, 인공관절 치환술 등의 환자 등의 환자 치료에 많이 사용하는 장관골의 동종 이식에 대한 PRP (Platelet-Rich Plasma)의 효과를 토끼를 이용한 실험으로 알아보고자 하였다. 대상 및 방법: 20마리의 토끼를 대상으로 각각에 일련번호를 붙이고, 각 토끼의 양측 척골에 약 2㎝ 길이의 골편을 얻어 장관골 결손을 만들고 동시에 동종 장관골을 얻어, 홀수 토끼의 척골 골편을 짝수 토끼의 골결손 분위에 이식하고, 반대로 짝수 토끼의 척골 골편을 홀수 토끼의 골결손 분위에 이식하였다. 그 후 각 토끼의 좌측 척골 이식 부위에는 아무런 처치를 하지 않고 대조군으로 삼고, 우측 척골 이식부에는 PRP 0.7cc를 처치하여 실험군으로 삼았다. 술 후 0, 4, 8, 12주에 골이식부에 대한 방사선 촬영을 통하여 골유합 성적을 평가 비교하였다. 결과: 실험군의 척골 분절 결손부에서는 대조군에서보다 동종 분절골 이식부의 골유합이 방사선학적으로 향상된 것을 관찰 할 수 있었다. 결론: 동종 장관골 분절 이식시 PRP를 병용하여 사용할 경우 더욱 효과적인 신생조직 형성을 유도할 수 있으며, 임상에도 유용하게 적용할 수 있으리라 사료된다. Purpose: The purpose of this study was to evaluate the effect of Platelet-Rich Plasma(PRP) on the healing of the allograft for the treatment of the segmental bone defect of the ulna in Rabbits. Materials and Methods: About 2 ㎝-sized segmental bone defects were created on both ulna of twenty rabbits. The rabbits were divided into two groups, even and odd number groups after numbering them from 1 to 20. The segmental bone from the odd numbered animal was transplanted to the even numbered animal, and the even numbered to the odd numbered. The left side of the ulna was grafted with a segmental allograft only. The right side of the ulna was grafted with a segmental allograft and 0.7cc of PRP. Radiographs obtained at 0, 4, 8, and 12 weeks postoperatively were graded for radiologic union. Result: The use of the combination of PRP and segmental allograft demonstrated improved healing on radiographic study compared with that demonstrated after use of allograft alone. Conclusion: The results of the study suggests that the use of the combination of PRP and segmental allograft can be considered as an alternative method to manage the segmental defect of the long bone.

擔體를 包含한 에멀젼型 液膜의 구리이온 促進 傳達에 關한 模寫硏究

宋東益,崔相俊 慶北大學校 1984 論文集 Vol.38 No.-

A mathematical model for facilitated transport simultaneously taken account of both the formation reaction of copper complex at the external aqueous solution and internal diffusion of the complex in the liquid membrane was developed and compared with the experimental data. Overall reaction equilibrium constant was estimated to be 6×10exp(-10) by fitting the model equations to the experimental data. The formation rate of copper complex was confirmed to be nearly first order with respect to the copper ion concentration. More studies on the reaction order of the hydrogen ion concentration, however, seem to be required. First of all, kinetic studies should be performed to obtain more accurate reaction rate equation for the development of the extraction processes in the future.

비 인두암에서 EB-virus의 검출 및 비 인두암과 EB-virus로 전형시킨 B 림프구의 세포유전학적 비교

장성익,김홍태,이인환,최인장,송달원 대한해부학회 1994 Anatomy & Cell Biology Vol.27 No.1

液膜法에 依한 Cu(Ⅱ) 이온의 抽出에 關한 硏究

崔相俊,宋東益 慶北大學校 1984 論文集 Vol.37 No.-

Water in oil (W/O) emulsion was prepared from aqueous hydrochloric acid solution and xylene containing both benzoyl acetone as a carrier and Span 80 as a surfactant. After dispersing W/O emulsion into a third aqueous phase, external buffer solution dissolving copper ion, water in oil in water (W/O/W) emulsion was manufactured. Copper ion extraction was performed using this W/O/W emulsion system. Effects of characteristic of external aqueous solution on emulsion stability were investigated and optimum extraction conditions were determined using the results of extraction experiment. Optimum conditions were as follows; surfactant concentration was 2wt. %, internal aqueous hydrochloric acid concentration 0.3M, carrier concentration 0.02M, stirring speed 200 rpm, pH of external aqueous buffer solution 5.5 and volume ratio of external aqueous buffer solution to emulsion phase 6. When initial copper concentration of external aqueous buffer solution was 500 ppm, copper ion could be removed to 99% from external solution in 30 min.

Air-coupled 트랜스듀서를 이용한 발전설비 배관에서의 유도초음파 모드 규명

박익근,김현묵,김용권,송원준,조용상,장경영,조윤호 한국비파괴검사학회 2004 한국비파괴검사학회지 Vol.24 No.4

발전설비의 중요한 요소인 배관의 효율적인 비파괴검사를 위해, 배관내에 유도초음파를 comb 트랜스듀서를 이용하여 발생시켰으며, 유도초음파를 비접촉 방식으로 수신하기 위해 ACT(air-coupled transducer)를 적용하였다. comb 트랜스듀서의 요소간격과 이론적인 분산선도로부터 발생가능 한 유도초음파 모드가 예측되었다. 또한 예측된 모드를 수신하기 위해 각 모드의 이론적인 위상속도를 이용하여 ACT의 수신 각도를 결정하였다. 수신모드의 특성을 규명하기 위해 웨이블릿 변환과 2D-FFT를 이용한 시간-주파수해석을 수행하여 이론적인 분산선도와 비교한 결과, 수신된 모드는 이론적으로 예측된 모드와 일치하는 것으로 나타났다. In order to inspect the piping effectively, one of the important components in the facility of power plants, the ultrasonic guided wave was generated by a comb transducer and was received in a non-contact fashion by using an air-coupled transducer. The guided wave modes that can be generated by the comb transducer in piping are predicted from the theoretical dispersion curves and the element spacing of a comb transducer. Moreover, to receive the specific modes, the receiving angle of the air-coupled transducer is calculated from Snell's law between the phase velocities of guided waves and the sound velocity of air. The guided wave modes obtained in experiments are identified from the result of time-frequency analysis such as wavelet transform and two-dimensional fast Fourier transform.

大田大學校 大田韓方病院의 中風早期檢診 實態調査

염익환,송인선,유호상,손원택,오민석,송태원 대전대학교 한방병원 2001 惠和醫學 Vol.10 No.1

This study was done to investigate the distribution of disease, which belongs to the people who came to the Daejon Oriental Hospital for the examination of CVA. The results were as follows : 1. It shows the highest ratio in his 40's and in her 50's. 2. The Hypertension patient is 26% and 40's is the highest, by 35%. 3. The Obesity patient is 51% and 50's is the highest, by 57%. 4. The Diabet mellitus patient is 5% and 30's is the highest, by 9%. 5. The Hyperlipidemia patient is 44% and 60's is the highest, by 52%. 6. The Liver disease patient is 18% and 40's, 50's is the highest, by 21%. 7. Abnormal EKG patient is 39% and 60's is the highest, by 57%. 8. 16% patient have abnormalities in brain CT and 70's is the highest, by 42%. 9. 70% patient have abnormalities in C-spine series and 70's is the highest, by 85%. 10. 32% patient have abnormalities in Chest PA and 70's is the highest, by 99%. 11. Soyang type is 32%, Soyum type is 25%, Taeyum type is 43% and Taeyang type is 0%.

강재 슬릿형 댐퍼를 부착한 철근콘크리트조 골조의 거동

신종익,이정한,송한범,강대언,오상훈,차승렬,이용재,김상대,이원호 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)

This study investigates the performance of the reinforced concrete frame with the steel plate slit damper. The test was carried out to investigate the structural behavior between the reinforced concrete bare frame and the reinforced concrete frame with the steel plate slit damper. The test results showed that the energy absorption capacity of the damped-frame was several times larger than that of the bare frame. For the damage by the input energy is concentrated on the steel plate slit damper, the ductilities of the former structure were increased and the damaged frame can be reused after exchange the steel plate slit damper.

글로벌 SCM 환경에서의 통합 생산계획 모델에 관한 연구

정호상,송익수,정봉주 한국로지스틱스학회 2002 로지스틱스연구 Vol.10 No.1

본 논문은 글로벌 SCM(Supply Chain Management) 환경에서 생산 연계 비용의 최소화를 목적으로 하는 생산 계획 수립 알고리즘을 제안한다. 글로벌 SCM환경은 지역적으로 분리된 여러 개의 공장에서 각각 부분품 및 완제품의 생산이 이루어지는 환경이다. 이러한 환경에서 완제품의 주문량 또는 수요 예측량을 만족하지 위해 제품의 BOM(Bill-Of-Material) 구조를 고려하여 각 부분품의 생산계획량을 결정해야 한다. 각 공장에서는 제한된 생산 능력을 가지면, 특정 부분품 또는 완제품을 생산한다. 부분품의 생산은 특정 공정 시간을 가지며 완성된 부분품은 이후 공정을 위해 다른 공장으로의 이동시간을 갖는다. 본 논문의 목적은 공장의 생산능력을 만족시키면서 제품의 공장별 생산 비용, 재고 비용, 공장 간 물류 비용을 최소화 시키는 생산 계획을 수립하는 문제의 해를 구하는 것이다. 본 논문에서는 글로벌 SCM 네트워크를 정의하고, 주어진 네트워크의 생산 계획문제를 혼합 정수 계획법을 이용하여 모델링한다. 효과적으로 문제를 해결하기 위해 계산 시간면에서 효율적인 발견적 기법을 제안하고 실험을 통해 해법의 성능을 검증한다. This paper presents a production planning algorithm for minimizing the costs of production and distribution in Global SCM(Supply Chain Management) environments. In the Global SCM environment, the several local plants produce parts and products. In this environment, we have to decide the production volumes of both parts and products considering the BOM(Bill-Of-Material) structure to meet the fixed order quantity or forecasted demand quantity. Each plant produces the specified parts of product and has a certain production capacity. There exist a fixed production lead time to make products and transportation lead time to move parts to different plants for subsequent processes. The objective of this study is to solve the production planning problem, which minimizes the total costs of production, inventory, and transportation under constraints of production capacity. For this problem, the integrated production planning model was formulated as a mixed integer programming, and an efficient heuristic algorithms was proposed. The experimental investigation shows that the proposed heuristic generates quite good solutions at very low computation costs.

체외충격파 쇄석술의 치료의 성공률과 Hounsfield units 상관관계

김동준,이상익,송동우,정태융 관동대학교 의과학연구소 2006 關東醫大學術誌 Vol.10 No.1