노후공동주택의 거주성능평가요소에 관한 연구

이병태,현택수,정의용 대한건축학회 2004 대한건축학회논문집 Vol.20 No.2

This study aims to propose the comprehensive evaluation of Performance multi-family housing. Most of the existing studies for the reproduction have evaluated the deterioration by the safety of structure. Therefore those pass over the functional factors which is important for the evaluation of residential qualities. This study represents that the reproduction renovation should not be secured the safety of structure but established the quality of life. And questionnaire asking expert's opinion also supplemented. As a result, the item for examination and the weight for evaluation are suggested in functional deterioration. The results of this study are summarized as follows: 1. Existent redevelopment criteria are not appropriate to decide the environmental comfort, the vital function of housing and the residential management finance. 2. The future criteria have to evaluate the existing environmental comfort, be reconstructed to put first general deterioration. 3. Evaluation elements was extracted throughout the document research. evaluation elements analysis system was separated in residential area, suburb of dwellings, community, and housing complexity environmental assesment. 4. Each category of influence ratio was extracted to assess total deterioration throughout the expert question survey. 5. Each category analysed : ① 0~30%: function is good (unnecessary to improve) ② 31~40%: average (necessary of partial improvement) ③ 41~59%: bad (necessary of total improvement) ④ 60~100%: the worst (unable to improve throughout the repair)

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.

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.

Study on Microstructure and Mechanical Properties of the Al–25Cr–5Si (at%) Alloy Powder Using Gas-Atomization and SPS Process

Yong‑Ho Kim,Hyo‑Sang Yoo,Jeong‑Han Lee,Ik‑Hyun Oh,Hyun‑Kuk Park,Hyeon‑Taek Son 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.7

In order to investigate the microstructure and mechanical properties on Al–25Cr–5Si (at%) alloy, a mixed powder with pureelements and an alloy powder using a gas atomization process were used. Fine and high purity Al–25Cr–5Si (at%) alloypowder was successfully prepared by gas atomization and densified using a spark plasma sintering (SPS) process. The overallpowder size distribution of the mixed Al, Cr, and Si elemental powders was in the range of 10–15 μm. The atomized Al–Cr–Sialloy powder was fine and spherical in morphology and difficult to be formed by intermetallic formation. Densification wasclearly confirmed at 1000 °C, with almost isolated pores formed, by clear removal of pores between particles, deformationof particles, an increase in the number of contacts, and a change in size between particles. As a result of XRD analysis ofthe sintered compacts, single phase was observed using the mixed powder, but the compact using gas atomization remainedthe alloy phase even at the process temperature. The Vickers hardness of the compacts by mixed powder was observed at59.70 Hv and the compact using gas atomized powders on the temperature 1000 °C of the Vickers hardness increased to702.6 Hv. The compressive yield strength of the compact with mixed powder was 195.24 MPa and the compressive strengthof the compact with gas atomized powder increased to 802.07 MPa. It is considered not to be decomposed by the AlCrSi,Al13Cr4Si4and Al8Cr5phases sintering process, resulting from the improvement of mechanical properties.

설계추진단계별 설계VE의 효율적 적용 방안

이승훈,서용칠,구교진,현창택 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1

The purpose of this study is to propose an efficient design-VE job plan and applicable methods in each phase of design process. This is for more effective and practical use of VE in design phase. This study focuses on differences of the VE target selection phase and function analysis phase in each phase of design process. In the phase of preliminary design, conceptual sketch, size, use, or major spaces of project are selected for VE target and function assessment step is skipped because present cost and function cost cannot be produced easily in early in early phase of design. At the end of preliminary design phase, function review phase is added which consists of function satisfactory indices review step and unsatisfactory function removal step.

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.

쇄골 골절에서 지연성 상완 신경총 마비 : 1예 보고 A Case Report

이우석,정환용,전택수,김용상,김남현 대한골절학회 2003 대한골절학회지 Vol.16 No.2

상완 신경총 마비는 쇄골 골절 후에 매우 드물게 발생하며, 대부분 많은 가골 형성을 동반한 쇄골의 중간1/3 부위 골절 불유합에서 발생한다. 골절의 치유 과정에서 과형성된 가골이 상완 신경총을 압박할 수 있으며, 감압술고 불유합에 대한 수술적 치료를 필요로 한다. 이에 저자들은 쇄골 골절 후 불유합과 과도한 가골 형성에 의해 발생된 지연성 상완 신경총 마비 환자를 치험 하였기에 보고하는 바이다. The brachial plexus palsies secondary to nonunion of the clavicle fracture are extremely rare. The nonunions are hypertrophic and usually in the middle third of the clavicle. Hypertrophic callus produced healing process will cause a compression of the neurovascular bundle. This lesion requires operative treatment for decompression of the brachial plexus and internal fixation of nonunion. We present a case of delayed brachial plexus palsy due to nonunion and excessive callus formation of a clavicular fracture.

포트폴리오 收支論的 國際收支 調整 理論小考

李鐘燮,林龍澤 군산대학교 산업개발연구소 1987 産業開發硏究 Vol.6 No.-

고정상세포분리기의 개발 및 Cyclosporin A 생산을 위한 고정화 연속배양공정에의 적용

이태호,박성관,장용근,전계택 한국미생물생명공학회 ( 구 한국산업미생물학회 ) 1996 한국미생물·생명공학회지 Vol.24 No.6

균사형성 미생물인 고정상곰팡이의 연속배양공정에 필수적인 효율적인 고정상세포분리기를 개발하고 이를 실제로 면역억제제인 cyclosporin A(CyA) 연속생산공정에 적용하였다. 점성이 큰 고분자인 carboxymethyl cellulose 용액을 이용한 실험에서 개발된 고정상 세포분리기는 분리능이 우수하여 고점도·고유속의 경우에도 고정성담체가 거의 유실되지 않았다. 이는 고정상세포분리기내에 설치된 공기유출관과 분리관의 역할에 기인하는 것으로 보인다. 또한 실제 곰팡이 세포를 이용한 고정상 연속배양(IPRS)의 경우 고정상세포분리기를 설치함으로써 담체밀도의 감소와 배양액내의 고농도(10g/l) 현탁 곰팡이 세포의 존재에도 불구하고 안정한 조업가능성을 보였다. 고정상 연속배양의 높은 희석속도에도 불구하고 균체 및 CyA의 생산성이 높게 나타났으며, 담체가 반응기 밖으로 거의 유출되지 않은 점으로 보아 고정상세포분리기의 우수한 성능 및 조업안정성을 확인할 수 있었다. We have developed an efficient immobilized cell separator for continuous operation of immobilized fungal cell cultures, and applied this separator to actual fermentation process for the production of cyclosporin A (CyA), a powerful immunosuppressant. In the experiments employing highly viscous polymer (carboxymethyl cellulose) solution, the decantor showed good separating performances at high solution viscosites and fast dilution rates. Air duct and cylindrical separator installed inside the decantor turned out to play key roles for the efficient separation of the immobilized cells. By installing the decantor in an immobilized perfusion reactor system (IPRS), continuous immobilized culture was stably carried out even at high dilution rate for a long period, leading to high productivities of free cells and CyA. Almost no immobilized biomass existed in effuluent stream of the IPRS, demonstrating the effectiveness of the decantor system for a long-term continuous fermentation. It was noteworthy that we could obtain these results despite of the unfavorable fermentation conditions, i.e., reduced density of the biosupports caused by overgrowth of cells inside the bead particles and existence of high density of suspended fungal ells (10 g/l) in the fermentation broth.

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