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장세웅(Jang Se-Woong),이상효(Lee Sang-Hyo),김재준(Kim Jae-Jun) 대한건축학회 2010 대한건축학회논문집 Vol.26 No.8
This study aims to analyze the relationship between the financial crisis of Korean construction companies and macroeconomic fluctuations. In this study, current ratio used an acting variable for liquidity ratio, and debt ratio for leverage ratio. GNI, L, exchange rate, interest, and CPI were used for the macroeconomic variables. VECM consisted of Model 1 and Model 2 to analyze the relationship between current ratio and macroeconomic variables, and between debt ratio and macroeconomic variables, in order to analyze each model through variance decomposition and impulse response function. This study is a useful research to analyze the dynamic relationship between the financial crisis of construction companies and macroeconomic fluctuations. The financial ratios of construction companies are directly used for analysis, making this a more practical analysis than studying the relationship between macroeconomic fluctuations and the comprehensive indexes of construction business. The collected data are limited, as the time series data of current ratio and debt ratio were secured based on the financial statements of the most capable 50 constructions companies in Korea. If the sample companies were divided in future research according to scale, in order to analyze the relation between financial crisis and macroeconomic fluctuation by company scale, a more developed result could be obtained.
장세웅(Jang Se-Woong),이상효(Lee Sang-Hyo),김재준(Kim Jae-Jun) 대한건축학회 2010 대한건축학회논문집 Vol.26 No.3
Investment target such as a stock market may have influence on housing demand and housing price as it works as a motive for asset investment. A stock market and real estate market forms a relationship of either asset synchronization or asset replacement depending on a given circumstance. The amount of working capital may shift due to investment rate of return; or the two indicators may move in the same direction in response to overall market situation. In real estate market, investment demand may vary in different regions. Thus, a stock market and a local real estate market might show various and dynamic relationships. In this study, the dynamic relationship between stock index and local real estate value is examined using VECM(Vector Error Correction Model). For this purpose, stock index was analyzed to measure condition of a stock market. For indicator of local real estate market, the housing sales price index in Gangnam and Gangbuk area in Seoul was used. Concerning time-series analysis of each variable, monthly data from the National Statistical Office and Kookmin Bank was used. The analysis result demonstrated that the real estate value showed varying correlation with stock price in Gangnam and Gangbuk area.
장세웅(Jang Se-Woong),이상효(Lee Sang-Hyo),김재준(Kim Jae-Jun) 대한건축학회 2009 대한건축학회논문집 Vol.25 No.3
Recently, the large-scale apartment buildings such as high-rise residential buildings are actively constructed. And these buildings are located on the main place. Therefore these buildings are cognized as the representative building in each local, because of the relative difference of scale and the location. These cognition factors can cause demand of the apartment buildings. Finally the concentration of purchasing demand causes rising of price of apartment building to have high cognition. The purpose of this paper is to estimate the value of cognition factors within an apartment housing.
장세웅(Jang Se-Woong),김상기(Kim Sang-Ki),이상효(Lee Sang-Hyo),김재준(Kim Jae-Jun) 대한건축학회 2009 대한건축학회논문집 Vol.25 No.10
Because the latest housing construction business shows a downward trend, It is difficult to operating construction company. It means that the change of housing construction business has influence on the stability of construction company because housing construction is forming an great part of the domestic construction. Therefore this paper attempts to analyze on the relation between the stability fluctuation of construction company and the change of housing construction business by using Vector Auto Regression Model. The collected data is limited, as the time series data of current ratio and debt ratio was secured based on the financial statements of the most capable 50 constructions firms in Korea. The result shows that housing construction business have an more effect on the stability of construction company than non-residential and civil construction business.
전지혜 ( Ji Hye Jeon ),정세웅 ( Se Woong Chung ),박형석 ( Hyung Seok Park ),장정렬 ( Jeong Ryeol Jang ) 한국물환경학회 2011 한국물환경학회지 Vol.27 No.4
The objective of this study was to construct and assess the applicability of the EFDC model for Saemangeum Reservoir as a 3D hydrodynamic and water quality modeling tool that is necessary for the effective management of water quality and establishment of conservation measures. The model grids for both reservoir system only and reservoir-ocean system were created using the most recent survey data to compare the effects of different downstream boundary conditions. The model was applied for the simulations of temperature, salinity, water quality variables including chemical oxygen demand (COD), chlorophyll-a (Chl-a), phosphorus and nitrogen species and algal biomass, and validated using the field data obtained in 2008. Although the model reasonably represented the temporal and spatial variations of the state variables in the reservoir with limited boundary forcing data, the salinity level was underestimated in the middle and upstream of the reservoir when the flow data were used at downstream boundaries; Sinsi and Garyuk Gates. In turn, the error caused to increase the bias of water quality simulations, and inaccurate simulation of density flow regime of river inflow during flood events. It is likely because of the loss of momentum of sea water intrusion at downstream boundaries. In contrast to flow boundary conditions, the mixing between sea water and freshwater was well reproduced when open water boundary condition was applied. Thus, it is required to improve the downstream boundary conditions that can accommodate the real operations of the sluice gates.
인접세대의 난방 조건에 따른 공동주택의 난방에너지 사용량 분석에 관한 연구
권경우(Kyung-Woo Kwon),박선효(Sun-Hyo Park),이병권(Byung-Kwon Lee),장세웅(Se-Woong Jang) 대한설비공학회 2012 대한설비공학회 학술발표대회논문집 Vol.2012 No.6
Normally, it is assumed that heating and temperature condition of each household are equal on apartments. That means heat loss to adjacent household is not considered for heating load calculation of each unit. But adjacent walls, including ceiling and floor, have large area and high U-value, it can cause heat loss to adjacent household. So, the purpose of this study is survey of heating energy consumption by adjacent household. Results of this study show that heat loss to adjacent household by heating control and set temperature can cause much heating energy consumption and the code for adjacent insulation is needed.
급기가압 제연시스템의 성능개선을 위한 무지향성 제연댐퍼시스템 개발연구
배상환(Bae, Sang-Hwan),류형규(Ryu, Hyung-Kyou),이병석(Lee, Byung-Seok),장세웅(Jang, Se-Woong) 한국화재소방학회 2012 한국화재소방학회 학술대회 논문집 Vol.2012 No.춘계
본 연구에서는 기존 급기가압 제연의 성능평가를 수행하였고, 이를 기반으로 급기가압제연댐퍼의 기류방향에 따른 방연풍속 확보가 곤란한 점에 착안하여 무지향성 제연댐퍼시스템을 개발하였다. 개발된 무지향성 제연댐퍼를 대상으로 Mockup 실험을 수행한 결과 화재실 출입문과 제연댐퍼의 설치위치와 상관없이 방연풍속 확보가 가능하여 급기가압제연시스템의 성능개선효과가 매우 큰 것으로 나타났다.