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주택가격 버블과 기준금리 변동의 시사점: 한국과 미국의 비교
김한석,이관영 한국재무관리학회 2022 財務管理硏究 Vol.39 No.2
양적완화에 대한 출구전략을 결정하기 위해서 경기에 큰 영향을 미치는 주택경기상황을 고려해야한다. 주택의 실질가격과 이론적 내재가치를 비교하여 버블이 존재 여부와 주택가격의 추가 상승여부를 가늠해 볼 수 있다. 본 연구는 미국과 한국 주택가격 버블을 실증적으로 비교 분석하여 최근관심을 끌고 있는 출구전략이 주택시장에 미치는 영향에 대하여 논의해 보고자 한다. 한국 주택시장의주택 실질가격은 2000년 이후 상승하여 2007년 1분기에 정점에 도달한 이후 지속적으로 하락하였고2014년 3분기의 저점을 지나 다시 반등한 이후 지속적으로 상승하고 있다. 기준금리의 변화가 주택가격버블을 견인하는 결과는 도출되지 않았다. 다만 국내 기준금리 조정은 주택시장의 수급이 해소되지않은 상황에서는 가격변동의 주요 요인으로 볼 수 있고, 국내 경기가 미국 연방준비제도의 정책금리조정과 주택경기 변화에 후행적 영향을 받는 것으로 나타나 신중한 정책적 고려가 필요한 것으로해석된다.
공기 다단 분무연소기의 NOx 발생특성에 관한 실험적 연구
김한석,안국영,김호근,백승옥,Kim, Han-Seok,An, Guk-Yeong,Kim, Ho-Geun,Baek, Seung-Ok 한국기계연구원 2001 硏究論文集 Vol.31 No.-
An experimental investigation on the reduction of nitrogen oxide emission from swirling, turbulent diffusion flames was conducted using multi air staged combustor, The combustor utilizes swirler to dampen fuel/air mixing, allowing an extended residence time for fuel pyrolysis and fuel-N conversion chemistry in an locally fuel-rich environment prior to burnout. This process also allow to reduce thermal NOx formation to lessen the temperature of reaction zone. The aerodynamic process therefore emulates the conventional staged combustion process, but without the need for the physically separate fuel-rich and -lean stages. Parametric studies on the ratios of each staged air and droplet size were carried out the feasibility of fuel/air mixing for low NOx combustion with diesel and pyridine mixed diesel fuel oil.
폭굉제어기에 의한 수소 . 아세틸렌 산소 혼합가스의 폭굉제어
김한석,문정기 한국산업안전학회 1991 한국안전학회지 Vol.6 No.2
Quenching effects of acetylene and hydrogen into oxygen detonation by using detonation arrester [DA] are studied in this paper. The experiments were carried out in cylinderical shock tube, 5m long, 30㎜ dia., with storchiometric ratio [SR] of each gas and 10-120μCell Size of brass and Stainless Steel of DAs were installed in it. To clarify arresting ability correlation with initial pressure, Pi, critical thickness, Tct, and shapes of supporting panel of DA are also investigated. It is found that -detonation velocities has most dependency on Pi, it shows notable changes around 0.5Kgf/㎠ for hydrogen. 0.5Kgf/㎠ for acetylen respectively, -DA can be safety device able to arrest shock wave of detonation, -over Tct flame transmission might be only the factor has to be considered, -acetylene seems to be much more stronger detonation characteristircs than hydrogen because of reaction heat.
김한석,정병길,김대용,강동효,장성호,Kim, Han-Seok,Jung, Byung-Gil,Kim, Dae-Yong,Kang, Dong-Hyo,Jang, Seong-Ho 한국환경보건학회 2009 한국환경보건학회지 Vol.35 No.3
The main objective of this study was to evaluate the effects on shape and size, compressive strength, water absorption and heavy metals leaching with various weight mixing ratios in waste ash brick products using waste recycling MSWI(Municipal Solid Waste Incinerator) bottom ash, steel slag and waste building material. The manufacturing processes for the waste ash brick consist of screening, mixing, conveyor transmission, compaction.forming, and curing steps of raw materials. The weight mixing ratios of steel slag around bottom ash were adjusted within the ranges of 10% to 30%. The reported results show that the width and thickness of the manufactured waste ash brick could be satisfied with $90{\pm}2mm\;and\;57{\pm}2mm$, respectively which are K.S. standards of products qualities. And in case of length, only 20-Ba50Ss30, 20-Ba60Wb20 and 20-Ba50Wb30 for the mixing ratios could be satisfied with $190{\pm}2mm$ that is K.S. standards of products quality. The compressive strength and water absorption for 20-Ba50Ss30 and 20-Ba70Wb10 were over $8N/mm^2$ and below 15% respectively that are K.S. standards of manufactured waste ash brick. The results of tests for the heavy metals leaching in the all manufactured waste ash bricks are also passed to the wastes management regulations. The cost analysis of 20-Ba50Ss30 is evaluated. The manufacturing cost is evaluated 34.3 won/brick with 8 hours and 20tons of raw material per day. Incinerators with problems in bottom ash disposal can therefore derive significant benefits from the application of waste ash brick production.