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이상율(Lee Sang Yul) 한국지역지리학회 2003 한국지역지리학회지 Vol.9 No.4
본 연구는 대구시 도심의 토지이용 변화와 재개발의 실태를 파악하고, 도심 공간의 쇠퇴가 토지이용에 어떻게 반영되고 있는지를 고찰하였다. 1980년대 이래 우리나라의 대도시가 겪는 공통의 현상으로서 도심의 쇠퇴는 인구뿐만 아니라 경제활동에서도 영향을 미치고 있다. 이 같은 도심의 공동화 현상과 관련하여 도심에서 토지이용을 크게 용도지역과 실제 토지이용의 측면에서 중심상업지구와 주거지역에서 변화를 파악하였다. 그 결과 중심상업지역은 중심상점가에서 상업적인 기능이 강화되고, 업무적 기능은 정체 혹은 쇠퇴로 나타나는데 비해 주거용 토지이용은 다른 용도지역과 혼합되어 나타나지만 실제 개발은 필지 규모의 제약 때문에 도심 공간의 효율화에 저해가 되는 것으로 밝혀진다. 아울러 건축물에 기초한 토지이용 전환의 정도에 의해 주거용도의 변화를 뒷받침하고 있다. 끝으로 도시재개발 사업의 일환으로서 도심재개발 사업을 살펴보고, 현재의 문제점과 그 과정을 기술하였다. This study on land use and regeneration of urban central district in Daegu investigates the current trend of those changes, and examines the change of urban core on land use. Since the 1980s large cities in Korea have experienced the decline of spatial economic activities as well as population. Such urban decline has a relation with land use which can be classified with urban land use district and actual land use. This study tried to capture urban land use in three aspects downtown business, residence, and the change of land use conversion. Based on land use. Also, this study has reviewed urban renewal projects in Daegu, especially urban core renewal projects, and discussed the problems of the projects.
탄소섬유강화플라스틱CFRP의 인장하중하에서의 파괴거동에 따른 음향방출신호 특성에 관한 연구
이경원 ( Kyung Won Lee ),이상윤 ( Sang Yun Lee ),남준영 ( Jun Young Nam ),이종오 ( Jong Oh Lee ),이상율 ( Sang Yul Lee ),이보영 ( Bo Young Lee ) 한국항공운항학회 2010 한국항공운항학회지 Vol.18 No.4
Recently, aerospace structures have lightweight trend in order to reduce the cost of fuel and system, Carbon Fiber Reinforced Plastic (CFRP) can give the ability to reduce weight at 20~50% as the substitution of metal alloy, and there are advantages such as high Non-rigid, specific strength and anti-corrosion, but it is difficult to prove its destruction properties due to heterogeneous structure and anisotropy. In this study we designed specimen, inducing distinguishing destructions of material (for example, matrix crack, fiber breakage, and delamination) by using the Carbon Fiber Reinforced Plastic (CFRP) which is used in a real aircraft, to apply acoustic emission technique to aerospace structures. And we gained data via tensile testing and acoustic emission technique, from which each fault signal was classified respectively by using AE parameters and waveform.
용액 플라즈마 공정을 이용하여 제조된 금 나노유체의 특성평가
허용강,이상율,Heo, Yong-Kang,Lee, Sang-Yul 한국분말야금학회 2010 한국분말재료학회지 (KPMI) Vol.17 No.4
In the present work, water-based gold nanofluids were synthesized by the solution plasma processing (SPP). The size distribution and the shape of gold nanoparticles in the nanofluids were investigated using high resolution transmission electron microscopy (HR-TEM). The dispersion stability of gold nanofluids was characterized using zeta potential, as well. The thermal properties of gold nanofluids were measured by utilizing lambda measurement device. Nanofluids containing nanoparticles with $64.0{\pm}42.1\;nm{\sim}18.10{\pm}5.0\;nm$ in diameter were successfully synthesized. As diameter of nanoparticles decreased, dispersion stability of nanofluids increased and the enhanced ratio of thermal conductivity increased. The nanofluid with nanoparticles of $18.10\;{\pm}\;5.0\;nm$ in diameter showed approximately 3% improvement in thermal conductivity measurement and this could be due to the enhanced Brownian movement.
이종훈,배종욱,이상율,Lee, Jong-Hun,Bae, Jong-Uk,Lee, Sang-Yul 한국기계연구원 1998 硏究論文集 Vol.28 No.-
The wear and oxidation resistance of two phase nickel aluminides was investigated. Wear tests of various heat-treated specimens at room temperature and at $500^{\circ}C$ were performed under no lubricant condition in air by using a ball-on-disk type tribotester. Isothermal oxidation tests were made at $1100^{\circ}C$ in air flowing at the rate of 70cc/min and at $1000^{\circ}C$ in air by using TGA. Experimental results from wear tests showed that nickel aluminide with a higher content of Al had an improved wear resistance at both temperatures. Also the examination of the wear tracks after wear test at both room temperature and $500^{\circ}C$ indicated that regardless of the alloy compositions the wear tracks of the two phase nickel aluminides showed an abrasive type wear The improved oxidation resistance observed in the Ni-34at%Al alloy could to be attributed to the microstructural difference between the aluminides. An accelerated oxidation along the thin layer of $Ni_3AL$ along the grain boundary observed in the microstructure of the Ni-32at%Al aluminide could be attributed to the poor oxidation resistance.
초강인 AISI 4340 강의 부식 저항성 향상 및 응력부식균열
홍원식,박경순,이상율,김광배,Hong, Won-Sik,Park, Gyeong-Sun,Lee, Sang-Yul,Kim, Gwang-Bae 한국재료학회 1996 한국재료학회지 Vol.6 No.9
초강인 AISI 4340강을 85$0^{\circ}C$에서 2시간 동안 오스테나이징 처리 후 수냉하고, 250, 400, $600^{\circ}C$에서 각각 2시간 동안 템퍼링 처리를 하였다. AISI 4340강의 인장 특성은 상온에서 측정되었다. AISI 4340강 위에 니켈 전해도금된 것과 도금되지 않은 시편의 분극 특성이 3.5wt%NaCI 수용액과 인공해수에서 측정되었다. AISI 4340강위에 니켈 전해도금된 시편은 500mV(vs. Ag/AgCI)이하의 전위에서 부식 저항이 크게 향상되었다. 그러나 1A/$\textrm{cm}^2$의 전류밀도에서 30분 이상 니켈 전해도금된 시편은 도금층에 불순물과 기공이 형성되었기 때문에 AISI 4340강의 부식 저항은 감소되었다. AISI 4340강의 수소취화형 응력부식균열을 여러 작용 응력과 음극인가전력에서 U-bend 시편을 이용하여 IN 3.5 wt% NaCI 수용액에서 조사되었고, 수소취화형 응력부식균열 거동은 주사전자현미경으로 조사되었다.
기판바이어스 전압이 나노복합구조 CrZrSiN 박막의 기계적 물성에 미치는 영향에 관한 연구
김규성 ( Kyu Sung Kim ),김회근 ( Hoe Kun Kim ),라정현 ( Joung Hyun La ),김광배 ( Kwang Bae Kim ),이상율 ( Sang Yul Lee ) 대한금속재료학회(구 대한금속학회) 2015 대한금속·재료학회지 Vol.53 No.8
Nanocomposite CrZrSiN thin films were deposited with various substrate bias voltages from 0 to -200 V using unbalanced magnetron sputtering. The crystalline structure, microhardness, microstructure, and adhesion properties of the CrZrSiN thin films were evaluated by X-ray diffraction, Fischer scope, field-emission scanning electron microscopy, and a scratch tester. The surface roughness and deposition rate decreased with an increase in the substrate bias voltage. The substrate bias voltage increased and the hardness increased to 36 GPa at -100 V, then decreased to 32 GPa as the substrate bias voltage further increased to -200V. The CrZrSiN thin films maintained their hardness up to 800℃ while the hardness of CrZrN film decreased rapidly over 500℃. The critical load (Lc3) increased from 8 N to 35 N up to a substrate bias voltage of -100 V, while the critical load decreased to 8 N with further increase of the substrate bias voltage. (Received February 07, 2015)