호기성 생물막 여과법을 이용한 제지산업 폐수의 처리 특성

이태진,오중교,이용택,정두식 경희대학교 환경연구소 1995 環境硏究 論文集 Vol.6 No.-

This work researched the treatment characterization of paper mill waste water for Biological Aerated Filter (BAF)system. BAF process is ideal for reclamation and reuse of wastewater. It features excellent removal of organic matter and SS, Especially. it is easy maintain and achieves energe-saving and space-conservation when compared to conventionnal activated sludge method. This study resulted that upflow BAF system showed superior treatment efficiency to downflow one. The removal efficiencies of BOD, COD, SS were 85%, 80, 90%, respectively.

순환식 중공사막 접촉기를 이용한 이산화탄소의 분리 및 회수

이용희,이용택 忠南大學校 産業技術硏究所 1998 산업기술연구논문집 Vol.13 No.2

To investigate separation and collection behavior of CO₂by circulatory hollow fiber membrane contactors, pemeation experiments for absorption and desorption were carried out with various system parameters: absorption of CO₂in one membrane contactor and desorption of CO₂in another membrane contactor. Pure water and potassium carbonate aqueous solutions were used as an absorbent. The pemeation rate of CO₂increase either with the increment of the flow rate of absorbent or with the increment of the gas flow rate. The pemeation rate of CO₂increases with the increment of the degree of the vacuum in the desorption contactor. The pemeation rate of CO₂is found to be 11.54×10 moles/sec at 50 torr and 6.65×10 moles/sec at 100 torr. It is noted that the liquid absorbent could be circulated and reused after desorption of carbon dioxide. As the number of recirculation fo the absorbent increases, the desorption rate decreases and converges.

유전율이 다른 두 마이크로스트립 기판 접합에 의한 불연속의 해석 : 3차원 유한차분-시간영역 방법에 의한 접근

이용택,전중창,심재륜,김태수 위덕대학교 부설 전자기술연구소 1999 전자기술연구소 논문집 : 위덕대 Vol.3 No.1

본 논문에서는 3차원 유한차분 시간영역 방법을 사용하여 유전율이 서로 다른 마이크로스트립 기판의 접합 불연속 효과를 해석하였다. 본 논문에서 구현된 FDTD 알고리듬의 정확성을 검증하기 위해서, step-in-width 불연속 해석 결과를 상용 CAD 소프트웨어 시뮬레이션 결과와 비교였으며, 18 GHz까지의 주파수 범위에서 두 결과가 잘 일치하였다. 유전율이 서로 다르더라도 특성 임피던스가 동일하도록 도체 폭이 조절되면 반사계수가 -33 dB이하로 매우 낮아지며, 유전율이 서로 다르면서 도체 폭이 균일 한 경우에는 step-in-width 불연속 효과와 비슷한 결과가 얻어졌다. 유전율이 서로 다른 마이크로스트립 기판 접합에 의한 불연속 효과는 마이크로파 회로 모듈 패키징(packaging), 안테나 피더(feeder) 등의 설계에 적용될 수 있다. In this paper, we have analysed the junction of microstrip substrates having different permittivities using the 3-dimensional finite-difference time-domain (FDTD) method The accuracy of the FDTD application is validated by the comparison between FDTD results and commercial CAD software simulation results for a conventional step-in-width discontinuity. The FDTD results for the junction of microstrip substrates having different permittivities reveal that the reflection coefficient can be very small as below -33 dB only if the widths of metal strips are adjusted so that characteristic impedances of both sides are uniform. Also, it is shown that the junction with a uniform strip width has a similar characteristics as a step-in-width discontinuity. The simulation results presented at this paper can be applied to microwave circuit packaging and antenna feeder circuits.

졸-겔법에 의한 Mullite 코팅막의 제조 및 특성에 관한 연구

이용택,최영우,양중식 慶熙大學校 材料科學技術硏究所 1997 材料科學技術硏究論集 Vol.10 No.-

출발원료로 알루미늄 세크 부톡사이드(ASB)와 테트라 에톡시실란(TEOS)을 사용하는 졸-겔법에 의해 뮬라이트 조성의 졸 용액을 제조하고, 지지체 표면위에 침지 시간의 변화에 따라 코팅을 실시하였다. 그 결과 뮬라이트 결정화를 위해서는 1,300℃이상의 열처리 조건으로 균열 없는 뮬라이트 코팅막을 제조하는 것이 가능하였으며 침지시간에 따라 코팅막의 두께가 선형적으로 증가하고 평균 기공의 크기는 20∼30Å까지 기공 제어가 가능하였다. Optimal Mullite sol was synthesized by sol-gel process using Aluminium sec-butoxide(ASB), Tetraethoxy-silane(TEOS) and then, Mullite films were dip-coated with various holding time in sol bath and heat-treated at 1300℃ above for crystallization. The thickness of coated film increased linearly with holding time in sol bath and average pore size was controllable within 20-30Å.

초생재배에 관한 연구

이용하,정삼택 慶北大學校 生産技術硏究所 1970 生産技術 Vol.4 No.-

The results of sod culture from 1968 to 1969 can be summarized as follows: 1) In weed plot, the average soil temperature was 21.2℃ under the Roll's janet tree while the average temperature of orchard grass plot was 22.3℃. Red clover plots under and immediately surrounding Jonathan tree had the highest average soil temperature. The average temperature was 2-3℃ lower during the second year than the first year. The temperature of the control plot was 1 to 2℃ higher than that of the sod plot. The soil moisture content beneath Roll's janet tree was 49.0%, while the moisture content beneath Jonathan tree was 44.4%, both of which represent an 8% increase over last year. At the same time the orchard grass plot had a higher soil moisture content than both Roll's janet and Jonathan. 2) The fresh weight of the sod produced was the highest in the Ladino clover plot at Roll's janet and Jonathan orchards, whose sod fresh weight were 110.6Kgr and 113.7Kgr respectively. The fresh weight increased three times this year over last year. 3) Shoot elongation was the longest in the Ladino clover plot at 86.1㎝ while the control plot which showed the longest elongation in 1968 was retarded severely in 1969. 4) Due to the cutting of the sod, N.P. and K were increased but after one month the total content of N.P.and K decreased because of absorption of these elements by the tree. 5) Organic materials were highest in the Ladino clover plot of both the Roll's janet and Jonathan orchards, 1.82% and 2.28%, about 0.5-1.0% higher than the control plot. * Sod culture was better than clean-tillage culture for the following reasons. 1) The soil temperature of the sod plot was higher than the control plot by 1-2℃. 2) The sod plot contained 8% more moisture than control plot. 3) Shoot elongation of the sod plot was longer than that of the control plot. 4) There was more N.P. and K in the sod plot than control plot. 5) There was 0.5-1.0% more organic materials in the sod plot than in the control plot. * Comparision of the results between the sod and weed plot: 1) The sod plot was 2-3% higher in moisture content than the weed plot. 2) The sod plot produced 10-30kgr more weight of sod than the weed plot. 3) Shoot elongation of the sod plot was 5-8㎝ longer than the weed plot. 4) N.P. and K elements were 0.5-1.0% higher in the sod plot than in the weed plot. 5) Accumulation of organic materials in the soil was 0.5-1.0% higher in the sod plot than in the weed plot.

경막내 척수 섬유지방성 과오종 치험 1례 - 증 례 보 고 -

이용근,조준,문창택,장상근 대한신경외과학회 1998 Journal of Korean neurosurgical society Vol.27 No.10

원격탐사 데이터의 분석을 통한 레이다 클러터 모델 연구

이용택,전중창,김태수 위덕대학교 부설 전자기술연구소 1999 전자기술연구소 논문집 : 위덕대 Vol.3 No.1

본 논문에서는 주파수, 입사각, 전파 편향 등에 따른 클러터 데이터를 수집하고 이를 바탕으로, 이론적, 실험적 클러터 모델과 원격탐사 모델을 비교 분석하였다. 그리고 육지와 바다에 대한 원격탐사 모델을 클러터 영역으로 extrapolation하여 클러터 모델로의 적용 가능성을 제시하였다. 검토된 원격탐사 모델 중에서 선형적 데이터 피팅 특성을 갖는 Moore 모델은 low grazing angle에서 세부 표적별로 상세한 클러터 특성을 예측하는데 사용될 수 있으며, 해양에서는 균일한 바다 특성으로 인하여 그대로 사용될 수 있음을 보였다. 원격탐사 데이터베이스를 클러터 영역까지 적용하기 위해서는 단순한 data-fitting만으로는 불충분하며, 지구 곡률 반경의 영향, 지형 거칠기 효과, 대기 상태 등의 물리적 해석이 뒷받침되어야 한다. In this paper, we have comparatively analysed the radar clutter models and remote sensing models based on the collection of available remote sensing data base. The possibility of extrapolation of remote sensing models onto the radar clutter region is presented to obtain simplified clutter models, taking the advantage of abundant data base of remote sensing field. Moore model, linear data-fitting model, is found to be used in predicting clutter characteristics for detailed land targets and ocean clutter return even in low grazing angle. The application of remote sensing models for radar clutter models requires the explanation of various physical effects of, for examples, the earth curvature, earth roughness, the state of atmosphere.

고함수성 하이드로겔의 합성과 팽윤거동에 관한 연구

이용택 慶熙大學校 材料科學技術硏究所 1992 材料科學技術硏究論集 Vol.5 No.-

Highly swollen hydrogels which is a material having a good absorbability in a body is interesting in the field of a biomedical application. In particular, the gel obtains water to make a volume change that its magnitude depends on the composition of aqueous sloution. In order to synthesize a hydrogel and to find a moderate application, it is very important to inverstigate quantitatively the swelling-collapsing behavior of the gel. This study, therefore, was derived the swelling equation from Flory-Huggins swelling theory, and then the swelling-collapsing behavior of hydrogel on pH was predicted through quantitative analysis of the results of computer simulation. Polymethacylic acid hydrogel was prepared at various synthetic condition, that is, concentration of crosslinker and intiator. The swelling phenomena were tested in various ionic strength and pH of aqueous solution followed by comparison with the theoretical estimation.

세라믹막을 이용한 포도당 농축

이수은,이시철,이용택 경희대학교 산학협력기술연구원 1999 산학협력기술연구논문집 Vol.5 No.-

Aqueous glucose solution was concentrated using ceramic membrane in this study, the effects of volumetric concentration factor(VCF) were investigated on the change of flux and the transmembrane pressure(TMP). VCF was increased with the increase in operating time. The permeate flux was reduced as VCF became higher. The permeate flux was sharply decreased at about 18 of VCF, and the flux was not increased any more even in increase of TMP

소아의 상완골 원위부 과간 골절

이우석,정환용,김우식,김용찬,전택수,김남현,김규태 대한골절학회 2004 대한골절학회지 Vol.17 No.4

상완골 원위부 과간 골절은 소아에서는 매우 드물게 발생되는 골절로 대부분 주관절의 굴곡상태로 주관절 후방부에 직접적인 충격에 의해 발생하는 것으로 보고되고 있다. 전위가 없거나 경미한 경우 도수적 정복술 혹은 도수적 정복술 후 경피적 핀고정술을 시행하며, 전위가 심한 골절이거나 도수적 정복술이 불가능한 경우 관혈적 정복술 후 핀고정술을 시행하는 것으로 알려져 있다. 저자들은 전위된 상완골 원위부 과간 골절 환아 2예에서 각각 도수적 정복술과 관혈적 정복술 후 K 강선 고정술을 시행하여 만족한 결과를 얻었기에 보고하는 바이다. Intercondylar fractures of the distal humerus are very rare in children. The pattern of the fracture would suggest that the mechanism of injury involves a fall directly on the flexed elbow. Most agree that the undisplaced fracture can be managed conservatively. With increasing displacement and comminution, the opinions tend to differ. We suggest that closed reduction with percutaneous K wire pinning and open reduction with percutaneous K wire pinning offer a satisfactory methods by which to treat displaced intercondylar fracture in children.