• General Article

    Identifying drivers and barriers to green remodeling projects from the perspective of project participants
    Suryeon Kim, Yonghan Ahn and Jitaek Lim
    Green remodeling is becoming popular as it reduces greenhouse gas emissions in the existing building stock and improves the quality of the ... + READ MORE
    Green remodeling is becoming popular as it reduces greenhouse gas emissions in the existing building stock and improves the quality of the indoor environment. South Korean government is encouraging this trend by introducing green remodeling policies and incentives. To achieve successful implementations of green remodeling approaches, smooth cooperation among the various participants (i.e., design companies, construction companies, and consulting companies), with everyone understanding each requirement and what is expected of them, as well as support policies that take into account the characteristics of each participant are needed. Thus, this study aimed to examine the major drivers and barriers of green remodeling projects in South Korea for the main project participants. To achieve the research objectives, this study employed a questionnaire survey aimed at experienced practitioners. The survey results were analyzed by exploratory factor analysis and multivariate analysis of variance (MANOVA). As a result, four main drivers for the activation of green remodeling projects were identified: (1) environmental impacts, (2) social factors, (3) economic effects, and (4) occupants’ satisfaction. There were five barriers: (1) lack of technology, (2) uncertainty, (3) lack of social acceptability, (4) economic feasibility, and (5) government policies. Design and construction companies regarded occupants’ satisfaction as the most important driver factor while consulting companies thought social factors were the most important. For the barrier factors, all the participant groups considered economic feasibility to be the most important. These results can theoretically support the idea that adequate regulations, standards, and supporting policies are needed to promote green remodeling projects. Identifying the targets and main concerns of project participants will help boost technical development, promote collaboration, and establish effective processes. Municipalities interested in promoting green remodeling projects will find this study useful. - COLLAPSE
    December 2020
  • General Article

    Approximate analytical solution for free axial vibration of a cracked cantilever beam
    Hillal Ayas, Mokhtar Touati and Mohamed Chabaat
    In this paper, free vibration analysis of a cracked cantilever bar by an Approximate Analytical approach is investigated. The crack is modeled ... + READ MORE
    In this paper, free vibration analysis of a cracked cantilever bar by an Approximate Analytical approach is investigated. The crack is modeled by an equivalent axial spring with stiffness Kx according to Castigliano’s theorem. The effect of different crack depth ratio on the longitudinal frequencies and mode shapes in the cracked bar has been analyzed. It is shown that an increase in the crack depth ratio produces a decrease in the fundamental longitudinal natural frequency of a cracked bar. On the other hand, approximate analytical results indicate that the variation of a normalized longitudinal natural frequency with respect to the crack depth ratio give comparable results with those obtained from the numerical solution of an analytical equation of a cracked beam. - COLLAPSE
    December 2020
  • General Article

    A study on the prediction of thermal comfort for residuals using LSTM deep learning model
    Jongnam Ho, Jaeyoun Cho, Hyunkyu Shin, Joosung Lee, Woojae Kim and Yonghan Ahn
    Recently, the demand for thermal comfort of occupants in the building is increasing, and various studies to improve comfort are being actively ... + READ MORE
    Recently, the demand for thermal comfort of occupants in the building is increasing, and various studies to improve comfort are being actively conducted, but the studies predicted using time-series data are insufficient. Therefore, this study used time-series data to control temperature changes in an indoor space through an LSTM model to measure and predict the occupant’s body temperature and humidity data, and temperature and humidity data of individual and common spaces. Actual thermal comfort values and predicted values were compared and analyzed through various indicators, and the performance of the model was evaluated. As a result, when the actual thermal comfort is expressed from -3 to +3 on a 7-point scale, the MSE is within the range of 0.13, MAE is within the range of 0.25 to 0.28, and RMSE is within the range of 0.36 to 0.37. Therefore, these results were analyzed that the LSTM model can predict the thermal comfort of occupants. - COLLAPSE
    December 2020
  • General Article

    Development of guideline for safe decommissioning of concrete structures for nuclear facilities based on a comparative analysis with the previous asbestos dismantlement studies
    Hankwang Cho, Sojeong Seong and Yonghan Ahn
    The need to develop procedures and safety assessments for decommissioning is emerging as more nuclear power plants worldwide are planning closures for ... + READ MORE
    The need to develop procedures and safety assessments for decommissioning is emerging as more nuclear power plants worldwide are planning closures for safety, political, and social reasons. However, due to the lack of empirical examples and data related to the decommissioning of nuclear power plants, it is not easy to develop and verify the procedures and safety assessments for decommissioning. Therefore, countries with little or no nuclear decommissioning experience should establish a strategy to conduct safe decommissioning through the analysis of existing cases. While most of the guidelines for the decommissioning of nuclear facilities focus on radiological risks, they are relatively negligent in handling non-radioactive risk factors. As nuclear decommissioning has many similar characteristics to the dismantling of concrete structures, a proper decommissioning plan considering those risk factors should be formulated to protect workers and prevent accidents. Thus, this study aimed to develop procedures for the safe decommissioning of concrete structures in nuclear facilities, taking into account not only radiological risks but also structural hazards. In this study, we proposed the basic guidelines for avoiding the safety risks with the decommissioning process of radioactive concrete structures in nuclear facilities through the comparison with asbestos dismantling that had similar processes from the preparation stage to the disposal stage and systematic management through many empirical cases. And we verified their validity through expert interviews. - COLLAPSE
    December 2020
  • General Article

    Integrated approach of ANN and Taguchi algorithms for soils swelling estimation
    Nawal Dounane and Habib Trouzine
    Soils swelling behavior is one of the most damaging geohazard in the world. It can cause engineering problems such as damage to ... + READ MORE
    Soils swelling behavior is one of the most damaging geohazard in the world. It can cause engineering problems such as damage to foundations, buildings and infrastructure. The prediction of this type of soilis a very complex issue that depends on geological, environmental and structural factors alongside many others. Classical statistical methods adopted to predict vertical movements of soils require numerous long and expensive experiments. This paper explores the effects and interactions of clay content and plasticity index factors on the swelling potential and pressure estimates. The analysis was conducted using Taguchi’s L9 (32) orthogonal array, and back-propagation ANN was used to complete the design. Results indicate that integrating the Taguchi method and the network (ANN) approach is very efficient and accurate in predicting soil swelling as well as determining the effects and optimal conditions of different parameters. Analysis of variance (ANOVA) of the proposed integrated approach indicated that the plasticity index significance is about 91.66% and 95.77% respectively, for the estimation of swelling potential and swelling pressure. - COLLAPSE
    December 2020
  • General Article

    Comparison of subjective and objective thermal comfort of residuals according to office setting temperature changes
    Jaeyoun Cho, Joosung Lee, Woojae Kim and Hyunkyu Shin
    The purpose of this study was to compare the subjective thermal comfort level using the human skin temperature and humidity and the ... + READ MORE
    The purpose of this study was to compare the subjective thermal comfort level using the human skin temperature and humidity and the occupant questionnaire and the objective thermal comfort level using a PMV measuring device. To do this, the indoor temperature was changed to the set temperature of the system air conditioner, and the indoor temperature and humidity was measured using a general commercial temperature and humidity sensor and the thermal comfort was measured through a questionnaire. As a result, there were subjects who showed different objective and subjective comfort levels. This indicates that the temperature and humidity of each occupant is different from the indoor temperature and humidity, and it is necessary to measure the temperature and humidity of each occupant rather than the temperature and humidity of the space unit. - COLLAPSE
    December 2020
  • General Article

    Developing risk breakdown structure for nuclear power plant decommissioning projects in Korea focusing on radioactive concrete dismantle
    Hyosoo Moon, Byeol Kim, Joosung Lee, Hankwang Cho, Sangjun Hwang and Yonghan Ahn
    The number of nuclear power plants (NPPs) preparing for dismantling under permanent suspension owing to environmental problems or end of designed lifespan ... + READ MORE
    The number of nuclear power plants (NPPs) preparing for dismantling under permanent suspension owing to environmental problems or end of designed lifespan is increasing worldwide. In NPP decommissioning, structural and job risk analysis and management, considering the characteristics of radioactive contamination, are critical because they are directly related to the safety of workers. However, structural disasters and job risk factors that may present during decommissioning work are not largely addressed compared to the risk of dismantling facilities such as nuclear reactor dismantling. Furthermore, characterizing NPP decommissioning is difficult owing to the unsophisticated work breakdown structure. Thus, risk breakdown structure (RBS) for risk analysis is not systematically established because risk factors are not classified according to the specified dismantling work characteristics. Therefore, the purpose of this study is to establish an RBS reflecting the characteristics of the NPP dismantling work according to structural/job as a primary step for risk analysis and management. Each work’s risk factor is analyzed based on similarity to the construction-dismantling work, targeting the cutting work when dismantling the radioactive concrete structure, which presents the most significant risk, and derives the risk factors by matching them with structural and human damage factors. The RBS model established in this study is expected to be used as primary data for risk analysis and the safety evaluation of NPP dismantling works in the future. - COLLAPSE
    December 2020
  • General Article

    The polarization of environmental issues in the United States and the role of political trust in mitigating conservatives’ attitudes to environmental spending
    Jaeyoung Lim
    Environmental issues once had bipartisan support in the United States (US) from not just liberal presidents, but also conservative presidents such as ... + READ MORE
    Environmental issues once had bipartisan support in the United States (US) from not just liberal presidents, but also conservative presidents such as Roosevelt and Nixon who transformed the public’s perceptions of such matters. However, this consensus was short-lived and since the early 1970s, broad political support has waned, and the issue has become polarized. In this context, environmental issues pose an ideological risk to conservatives. However, political trust can act as a mechanism to alleviate their environmental antagonisms. Based on the existing literature and pooled data from three General Social Surveys (GSS), this study finds that political trust can moderate the relationship between conservatives and their attitudes to environmental spending. Conservatives are negatively associated with attitudes to environmental spending but depending on the level of political trust could support it. - COLLAPSE
    December 2020
Journal Informaiton International Journal of Sustainable Building Technology and Urban Development International Journal of Sustainable Building Technology and Urban Development
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