Earticle

The purpose of this study is to examine the effects of housing policy and monetary policy implemented to the change rate of housing price by four housing types. Based on monthly data from January 2005 to December 2015, empirical results show that inclining key interest rates and the restrictive housing policy tend to accelerate the change rate of housing price unlike stated by the theory. In particular, the effect of the key interest rates reflected in housing types differently. In the case of single housing, the monetary policy occured the opposite effects unlike total housing. Housing policy shows significant results in all types of housing. The apartment housing and the villa housing were reacting to changes in supply policy of housing unlike single housing. No wonder that apartment housing with 60.4 percent of total housing units are preferred as policy measures. However, single housing and villa housing should also be taken into consideration in housing policy measures because other types except apartment housing are occupied by a total of 43.5 percent of the population, and the price of housing on the personal properties can be regarded as the whole asset of every household.

Recently, various building integrated wind power (BIWP) systems have been developed to produce energy by wind power generators installed in buildings. A BIWP does not require a support to position the wind turbine at the required installation height, and it has the advantage of high energy efficiency because the energy produced by the turbine can be used directly within the building, rather than being sent a far distance. In this study, a computational fluid dynamics (CFD) analysis was conducted to examine the wind speed variations occurring due to changes in the building corner morphology, with the goal of using these changes to increase the wind speed and improve the power generation efficiency of a wind turbine installed between two buildings. Round building corners increased the wind velocity by 2–4%, whereas corner cuts increased it by up to 1.5%, when compared to the basic rectangular corner. These shape changes were more advantageous with shorter distances between the buildings.

The development of green building certification systems is moving towards specialization and customization to adapt to the needs of specific building types; such is the case for healthcare facilities, which having conditions to be taken into consideration. Particularly for healthcare facilities, the indoor environment is primordial as it is directly impacting the health and well-being of the occupants within the building. The Green Standard for Energy and Environmental Design (G-SEED) is the green building certification developed by the Korean government. While it has gone thorough major revisions in September 2016, the healthcare facilities building type remained as being evaluated as a 'General Building' without any consideration for its function and any modified evaluation criteria. International green building certification programs such as LEED and BREEAM already have in place a distinct evaluation system for healthcare facilities. In Korea, the population is rapidly aging, and the demand for the construction of healthcare facilities is on the rise. Healthcare facilities are generally complex in function and are large energy consumers, consideration for green building design, such as energy and water efficiency will be essential. In parallel, the design of healthcare facilities will need to be mindful of the use by a variety of occupants, including medical staff, visitors and patients. In other words, the healthcare facilities would need to improve its “indoor environment” in order to optimize the well-being, comfort and health of the occupants, which could be physical or mental. This paper studies the Korean G-SEED certification and its relevance to healthcare facilities and attempts to define the future needs to be addressed in its implementation. Research methodology consists of literature review, comparative analysis of G-SEED with international certification programs (LEED and BREEAM) by assessing the relevance of “indoor environment” for healthcare facilities. Preliminary results of the study suggest discrepancies between the performed evaluation and the actual needs, and improvement measures to the evaluation of “indoor environment” in these facilities are proposed.

Attention is recently being drawn to new-type belite-rich portland cements, which have high percentage of C2S content from 40 to 70% and appropriate specific surface area from 3000 to more than 4000cm2/g. Though belite-rich cement or low heat portland cement is characterized by the low hydration heat and low rate of strength development. This paper presents a hydration model that describes the evolution of cement paste microstructure as a function of the changing the degree of hydration. The coefficients for the hydration model are determined with an artificial neural network technique. Using the proposed model, this paper predicts the adiabatic temperature rise of concrete and heat evolution rate of paste made with different belite amount. The agreement between simulation and experimental results proves that the hydration model is quite effective and potentially useful.

Free-vibration response of structures includes informations their inherent dynamic characteristics such as natural frequency and damping ratio. Especially, viscous and friction damping cause free-vibation response of structures to logarithmic and linear decrement, respectively. This paper proposes simultaneous estimation of viscous damping ratio and friction coefficient by using free-vibration response that inherently includes dynamic characteristics of structures. The viscous damping ratio and friction coefficient are estimated from the successive two peaks in both displacement and acceleration free-vibration response of single-degree-of-freedom(SDOF) system with both damping. The proposed method of simultaneous estimating of viscous damping ratio and friction coefficient using free-vibration response of structures was verified by numerical simulation of an assumed SDOF system.

Dimming control is required when daylight is to be introduced into the room. In this case, the work surface illuminance must be sensed in real time and fed back. However, when the illuminance sensor is installed on the work surface, it is difficult to use the work surface, and it is difficult to accurately detect the illuminance by residents or objects. In order to solve the inconvenience of installation of the work surface illuminance sensor, the illuminance sensor is attached to the ceiling to feedback control the work surface illuminance. At that time, the relationship between the work surface illuminance and the ceiling illuminance is required, but there have been few studies related to this in Korea and abroad. The research propose and analyze a method to simultaneously measure and analyze the illuminance distributions of work surface and ceiling. The research installed 45 illuminance detectors in combination with Arduino, illuminance sensor and radio system to measure the illuminance of the ceiling. In the model building (3,840W×5,980D×2,570H) of this research, the reflectance of the ceiling material, wallpaper and flooring were 79.9, 83.4 and 40.4% respectively and the lighting equipment was 5,700K, 50W, 1,280L×320W, 4,000lm, lighting efficiency 80lm/W, LED 3Set. In this research, average illuminance of work surface and ceiling were 560 and 202lx, respectively, and average illuminance ratio(ceiling/work surface) was 0.37 on the basis of work surface illuminance. It is necessary to further study the relationship between the ceiling and work surface illuminance ratio with the reflectance of the wall.

Plant projects are increasing with the development of construction projects. Between 2011 and 2012, it had the best results, and its overseas expansion is on the rise. As construction companies and plant businesses develop, they face more risk factors. Risk factors have a potential personality and are difficult to predict when and where they will occur. Preliminary studies and past reports show that to reduce risk factors, you must deal with the initial parts of the project. The risk management process for each prior study is based on different methods, and the criteria and items are also different for each plant company. Accordingly, this study analyzed the risk management processes considered during the plant project stage and proposed the risk management process at the plant winning phase by compiling the expert opinions in the risk - related advance study process and past case analysis. Application to the current projects has led to a review to see if actual use is possible.

Busan area has many hill housings because of its geographical features and historical background. It can be assumed that the hill housing in Busan has a distinct characteristic because of its own conditions. The purpose of this study is to classify the types of hill housing based on the site of Moolmangol village in Busan and to investigate the site condition of the hill housing quantitatively and analytically from a topographic and spatial-configurational perspective. For this study, we defined the criteria for the classification of hill housing types according to the relationship of the housing with the access road and/or the way of entering into the housing, and set up three descriptive variables for the site condition of the housing. Through field survey, all of the housings in Moolmangool village were classified by the classification criteria and the three descriptive variables were calculated for each housing. Statistical analysis such as independence test and correlation test between classification types and ANOVA, T-test between classification types and the descriptive variables were carried out. Finally, we analyzed the site condition of the hill housing through the analysis results.