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이상훈,정기택,박재구,류경근 漢陽大學校 環境工學硏究所 1997 環境科學論文集 Vol.18 No.-
무기질 담채에 대한 폐수증 미생물의 흡착 메카니즘에 대하여 두 입자간의 물리화학적 상호작용을 설명하는 DLVO이론을 도입하여 검토하였다. 실험에 사용된 흡착제는 평균입도가 약40㎛ 정도인 규석, 고령토, 석회석질의 입자 및 다공성의 벌크상 소재를 이용하였다. 시간에 따른 미생물 흡착량(biofilm mass)은 반응전후의 담체(carrier)의 질량차로 구하였으며, 이에따른 폐수중의 COD제거율을 측정·평가하였다. 실험결과 폐수중의 COD제거율은 석회석, 고령토, 담체의 순으로 높게 나타났으며, 이는 담체의 표면전위(ζ-potential) 및 표면구조에따른 미생물 흡착량 변화에 기인 하는 것으로 생각된다. The mechanisms of adsorption of microorganisms to inorganic solid surfaces are studied with DLVO theory of describing physico-chemical interaction between two particles. Average size of 40㎛ of silica, kaolin, limestone powders and porous materials are utilized as adsorbent. Biofilm mass is estimated by the weight difference of carrier before and after the interaction with microorganisms. Also, COD removal rates in wastewater based on biofilm mss are discussed. As a result COD removal rate is higher in order of limestone, kaolin, and silica. This fact is considered that 5-potentials and surface structures of carriers cause change in adsorption capacity of microorganisms.
박병천,이성길,이용택 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.-
Epoxy resin based upon the N,N'-diglycidylaniline was modified with poly(amic acid)(PAA). Prior to aromatic amine cure, the possible reactions in the epoxy resin/PAA blends were investigated used FT-IR and inherent viscosity techniques with the addition of 4,4'-diamino-3,3'-diethyldicyclohexylmethane(3DCM) as hardener. PI-modified epoxy(GAYA) blends were prepared by IPNs method. IR, TGA, DSC, DMA, TMA and UTM are used to measured the thermal and mechanical properties. Thermal stability increasing with increasing PAA content in blends. Lowering Tgs with increasing PAA content in blends are observed except for the blend modified with thermoplastic. Improvement of the impact strengths in J/M in the range 920∼2,412 are observed for blends and the improvement of the impact strength is closely related to the content of PAA in blends. A rough surface was observed by SEM examination on the propagation surface of the impact specimen, while a smooth surface is observed on the unmodified epoxy specimen. The morphological observations suggest the PAA segment may act as a toughening agent in the epoxy networks, thus contributing to the impact improvement of the blends.
박종호,이성노,이은모,신완순,이택상,길경섭 충남대학교 공업교육연구소 2000 論文集 Vol.23 No.1
The aerodynamic study of jetvane type TVC(Thrust Vector Control) were conducted using supersonic cold-flow system. The use of TVC Systems in particular jet vanes, are currently being researched for use in air launch, ship launch, underwater launch and high altitude maneuvering of tactical missiles and rockets. The necessity to generate control forces to rapidly change the course of the missile is frequently required when traditional, exterior aerodynamic surfaces are unable to produce these forces, when the flow over the control surface is insufficient. This situation can occur at launch, or high angles of attack of the control surfaces. Jetvanes performed well at all altitudes and environmental conditions, and jet vanes are extremely effective at deflection angles up to as high as 30 degrees, make them ideal for the launch and maneuver applications. In this study, aerodynamic performance test of jetvane type TVC was conducted, and The effect of shape and deflection angle of various types of jetvanes are investigated
Timoshenko 보 이론을 이용한 층상균열이 있는 보의 진동해석 및 비파괴적 평가
韓秉基,李晟熙,柳澤仁 弘益大學校 科學技術硏究所 1994 科學技術硏究論文集 Vol.5 No.-
A study of the natural vibrations of Timoshenko beam with a split is presented. An analytic model, based on the transverse and longitudinal vibration of beams is employed to determine the natural frequencies. The variations of natural frequencies with the changes of size and location of laminar tear are plotted for several thickness ratio. A specific example are given to show the effects of rotary inertia, and shear deformation on the natural frequencies of the beam with a split. A new skill for the presentation of relationship between the size and location of laminar tear and natural frequencies is presented.
姜贊泳,柳擇仁,朴鳳賢,李晟熙,韓秉基 弘益大學校 科學技術硏究所 1998 科學技術硏究論文集 Vol.9 No.1
Vibration analysis of through-the-width-split beams for predicting buckling load is investigated based on Euler-Bernoulli beam theory. In split region, each segment is considered as a solid beam. In this region, recurrence equations relating integration constants for adjacent interior regions are established by satisfying continuity conditions at junctions of interior regions. The results of present study are compared with those of experiment and their results give good agreement with each other. From the result, it was shown that local buckling phenomena could appear in fundamental mode, however, there exists load carrying capacity after this phenomena.
Oxalic Acid Production in Submerged Culture of Aspegillus niger F22
Sang Il Lee,Keon Jin Lee,Sanghyun Ha,Hyun Jung Gwak,Ae Ri Han,Ho Hyun Chun,Young Bae Chung,Hyeong Hwan Kim,Jin-Cheol Kim,Teak Soo Shin,Hae Woong Park 한국응용곤충학회 2016 한국응용곤충학회 학술대회논문집 Vol.2016 No.04
Oxalic acid has a nematicidal activity against the root-knot nematode Meloidogyne incognita. High producer of oxalic acid was isolated, and then named as Aspergillus niger F22. Oxalic acid production was investigated under various temperatures from 20 – 33oC and rotational speeds in 5 L jar fermenters. Yield of oxalic acid increased with decreasing temperature. The highest yield was obtained at 23oC, showing the yield of oxalic acid of 8.7 g/L, whereas oxalic acid production was least at 33oC. At 20oC, the yield was lower than that of 23oC. At a rotational speed of 300 rpm, serious oxygen depletion was present from 48 - 72 h, resulting in low productivity of 26.2 mg /L·h. When a rotational speed was set at 600 rpm, dissolved oxygen tension was over 40% and oxalic acid production increased up to approximately 55%. Viscosity during the culture differed with temperatures. Viscosity increased with the increment of temperatures. When A. niger F22 was cultured at 23oC, viscosity was 810 cP, which was favorable for oxalic acid production.
Introduction to the MSC DCSU Operation
LEE, JONG TAE,LEE, SANG GYU,LEE, SANG TEAK 대한원격탐사학회 2001 International Symposium on Remote Sensing Vol.17 No.1
KARI is developing the MSC(Multi-Spectral Camera) instrument as a KOMPSAT-II payload which has mission of earth observing with 1 m GSD requirement. Because of the bandwidth-constrained telecommunication channel, realtime compression device is needed to send a lot of data from payload instruments directly to the ground station. And to perform playback mission some storage unit is also needed. In MSC system DCSU(Data Compression and Storage Unit) is used for those purpose. In this paper the functions of the DCSU and its operational concepts are described.