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Digital Vision Based Concrete Compressive Strength Evaluating Model Using Deep Convolutional Neural Network

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Computers, Materials & Continua 2019年第9期61卷 911-928页

作者： Hyun Kyu Shin yong han ahn Sang Hyo Lee Ha Young Kim Architectural Engineering Hanyang UniversityERICAAnsan-si15588Korea School of Architecture and Architectural Engineering Hanyang UniversityERICAAnsan-si15588Korea Division of Architecture and Civil Engineering Kangwon National UniversitySamcheok-si25913Korea Graduate School of Information Yonsei UniversitySeoul-si03722Korea.

Compressive strength of concrete is a significant factor to assess building structure health and ***,various methods have been developed to evaluate the compressive strength of concrete ***,previous methods have several challenges in costly,time-consuming,and *** address these drawbacks,this paper proposed a digital vision based concrete compressive strength evaluating model using deep convolutional neural network(DCNN).The proposed model presented an alternative approach to evaluating the concrete strength and contributed to improving efficiency and *** model was developed with 4,000 digital images and 61,996 images extracted from video recordings collected from concrete *** experimental results indicated a root mean square error(RMSE)value of 3.56(MPa),demonstrating a strong feasibility that the proposed model can be utilized to predict the concrete strength with digital images of their surfaces and advantages to overcome the previous *** experiment contributed to provide the basis that could be extended to future research with image analysis technique and artificial neural network in the diagnosis of concrete building structures.

关键词： Concrete compressive strength deep learning deep convolutional neural network image-based evaluation building maintenance and management

GREEN LUXURY:A CASE STUDY OF TWO GREEN HOTELS

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Journal of Green Building 2013年第1期8卷 90-119页

作者： yong han ahn Annie R.Pearce Western Carolina University Myers-Lawson School of Construction Virginia Tech

The hotel industry is beginning to implement green design and construction practices,saving energy,water,and resources and thus helping to preserve the *** addition,green building practices also can provide healthy and comfortable indoor environments to hotel occupants including guests and ***,there is the potential for conflict between green building practices and hotel guests’satisfaction and comfort,as the conservation of resources could detract from the quality of a guest’s visitor *** study adopted a case study approach to identify and analyze green design and construction practices that create a green and luxurious environment without damaging the hotels’financial *** in-depth literature review was conducted to identify green design and construction practices,design features of premium hotels,and major design conflicts between the twin goals of green building and a luxurious hotel *** LEED platinum hotels(the Proximity Hotel and the Bardessono Hotel,both in the United States)were selected and data collected on their green design and construction practices,luxurious design features,and operation and maintenance practices from multiple sources,including the owner,designer,contractor,engineer,and LEED *** the perspective of the entire lifecycle of the building,this data was analyzed to identify green design and construction practices that not only provide a green,luxurious environment but also enhance the hotels’financial strength.

关键词： green building green design and construction practice hotel industry case study

THE GREENING OF AFFORDABLE HOUSING THROUGH PUBLIC AND PRIVATE PARTNERSHIPS: DEVELOPMENT OF A MODEL FOR GREEN AFFORDABLE HOUSING

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Journal of Green Building 2014年第1期9卷 93-112页

作者： yong han ahn Yuhong Wang Kang Hee Lee Myung Hwa Jeon Department of Construction Management Western Carolina University Department of Civil and Environmental Engineering Hong Kong Polytechnic University Department of Architectural Engineering Andong National University Technology Development Department POSCO A&C Co.Ltd.

The trend towards affordable, green housing highlights the need for a Green Affordable Housing (GAH) model that produces durable dwellings that are not significantly more expensive to build, cheaper to operate, healthier for their occupants, and more environmentally sound. The model should also reduce the risk of poverty for those with low and moderate incomes, be close to public transportation, and support a neighborhood that is healthy, walkable and connected to the broader community and natural environment. This case study utilized detailed interviews with occupants, town officials, a developer, and a design builder to explore how green building strategies could be applied in real-world communities with the help of a Community Development Block Grant (CDBG) from the U.S. Department of Housing and Urban Development (HUD) and contributions from other funding bodies. Focusing on the Roanoke and Lee Street housing project in Blacksburg, Virginia (VA), this study demonstrated how green building strategies can be integrated into affordable housing with help from public programs and incentives to provide houses that are more durable, no more expensive to build, cheaper to operate, healthier, more environmentally sound and less risky for their occupants. The new framework includes ways to deal with neighborhood issues such as the deterioration of housing stock and infrastructure to support the creation of a vital and healthy neighborhood with improved public services and community spirit, as well as providing an integrated design process framework that enables stakeholders to work together to achieve the goal of building green and affordable housing.

关键词： affordable housing green building public and private partnership integrated design process

THE SYSTEMATIC COURSE DEVELOPMENT PROCESS:Building a Course in Sustainable Construction for Students in the U.S.A.

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Journal of Green Building 2009年第1期4卷 169-182页

作者： yong han ahn Hyuksoo Kwon Annie R.Pearce John G.Wells Myers-Lawson School of Construction Virginia Tech Virginia Tech Curriculum and Instruction Virginia Tech

The construction industry actively adopts the concept of sustainability to not only minimize the impact on the environment but also increase social and economic benefits through accepting sustainable design and construction *** growing trend in sustainable construction requires both new knowledge and new skills for sustainability,in addition to conventional knowledge,such as scheduling,estimating,contracting,*** to this paradigm change in the construction industry,construction programs in the *** offer sustainable construction courses in order to teach sustainable knowledge,technologies and skills to their students before their entrance into *** purpose of this study is to develop a sustainable construction course designed for university construction programs using a systematic course development approach divided into three stages including preparation,development,and *** course described in this paper is used to illustrate the systematic development process and can serve as an example for faculty at other universities on how to use such a *** the preparation stage,a syllabus review is conducted in order to recognize and evaluate current sustainable construction courses offered by construction *** addition,in-depth literature review is performed to identify current trends in sustainable construction courses and related *** development stage consists of:creating the framework for a sustainable construction course,choosing the goals and objectives for this course,choosing the contents of the course,organizing the chosen contents of the course,and planning the course *** the improvement stage,the proposed course is improved,reviewed,and evaluated by experts from both the construction industry and academia through a detailed feedback *** this systematically developed sustainable construction course,students in construction programs can learn basic knowledge of sustainability and the

关键词： sustainable construction construction education course development systematic approach

DESIGNING SUSTAINABLE LEARNING ENVIRONMENTS:LOWERING ENERGY CONSUMPTION IN A K-12 FACILITY

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Journal of Green Building 2011年第4期6卷 112-137页

作者： yong han ahn Young Oh Choi Bae Won Koh Annie R.Pearce LEED AP Construction Management East Carolina University Cheongju University South Korea AIA&LEED AP Myers Lawson School of Construction Virginia Tech

The construction industry is embracing sustainable building practices that boost the“triple bottom line”,namely the building’s ecological,social,and financial *** more than 55 million US students spend a significant part of their day in K-12 schools,it is vital that these facilities should provide healthy,comfortable,and productive learning *** we present an in-depth literature review of how educational facilities affect student school performance,comfort,and health,and we examine the role of sustainable design and construction strategies in influencing the physical learning environment in *** barriers to implementing sustainable strategies are examined,particularly the first cost premium of a sustainable building.A systematic decision strategy is described that incorporates sustainable design strategies,lowering energy consumption and improving indoor environments.A case study describes the process of incorporating sustainable strategies in a K-12 education facility in North Carolina to lower annual energy consumption and greenhouse gas *** to reduce the first cost premium and minimize operating costs over the facility’s life while providing healthy and comfortable learning environments for students and teachers are *** case study school also functions as an experimental learning tool for teaching sustainability to K-12 students,having the potential to improve their attitudes and behavior with respect to sustainability.

关键词： sustainable design and construction K-12 facilities energy consumption greenhouse gas emission

Modeling Energy Generation by Grid Connected Photovoltaic Systems in the United States

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Journal of Building Construction and Planning Research 2013年第2期1卷 39-44页

作者： Robert E. Steffen Sung Joon Suk yong han ahn George Ford Department of Construction Management Western Carolina University Cullowhee USA

This article presents the results of an analysis of hourly data obtained from forty-three photovoltaic (PV) systems installed in North America. Energy data collected from these systems were organized according to monthly output in an effort to identify factors which are effective in predicting energy generation. Independent variables such as system capacity, shading, longitude, latitude, seasonal variation, and orientation were considered. Multiple regression analysis was used to quantify the kilowatt-hours that can be expected from a change in the independent variables. Results show that all six independent variables are significant predictors which can be used in a regression model to estimate system output with a high level of confidence. The analysis shows that approximately 83% of the variation in the amount of energy generated monthly by the forty-three solar panels is explained by the independent variables and the derived equation. Results of the study may prove helpful to solar panel system users who may need to consider less than optimum conditions during a PV panel installation and service life.

关键词： Solar Energy Photovoltaic System Regression Analysis

GREEN CONSTRUCTION:CONTRACTOR EXPERIENCES,EXPECTATIONS,AND PERCEPTIONS

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Journal of Green Building 2007年第3期2卷 106-122页

作者： yong han ahn Annie R.Pearce Myers-Lawson School of Construction Virginia Tech Myers Lawson School of Construction Virginia Tech

As the benefits of green building continue to change the Architecture/Engineering/Construction industry and the num-ber of green projects rises in the United States due to market changes,more constructionfirms are gaining experience with this new way of building and changing their expectations for new hires from degree-granting construction *** paper documents a baseline study of contractor experiences,expectations,and perceptions associated with green building conducted in Fall *** study was based on detailed survey results from 87 different companies re-cruiting from three major university construction programs in the eastern United States(Auburn,Purdue,and Virginia Tech).The survey collected data regarding current experience levels and capabilities of companies with regard to green construction,corporate expectations of new hires in terms of green construction knowledge and skills,and respondent ex-pectations and perceptions about the future of the industry with regard to green *** of this study sup-port the growing importance of green building as a component of the whole construction market and provide a bench-mark against which to measure future changes in the industry over time.

关键词： companies industry construction

Prominent cycling reversibility and kinetics enabled by CaTiO3 protective layer on Zn metal for aqueous Zn-ion batteries

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Journal of Energy Chemistry 2025年第1期100卷 245-258页

作者： Gaeun Lee yong Nam ahn Seongjoon So Chanwoo Park Jong-Seong Bae Taehyun Park Il Tae Kim Jaehyun Hur School of Chemical Biological and Battery Engineering Gachon University Seongnam Busan Center Korea Basic Science Institute

Aqueous Zn-ion batteries （AZIBs） have received considerable attention owing to their various advantages such as safety,low cost,simple battery assembly conditions,and high ionic ***,they still suffer from serious problems,including uncontrollable dendrite growth,corrosion,hydrogen evolution reaction （HER） from water decomposition,electrode passivation,and unexpected *** creation of a uniform artificial nanocrystal layer on the Zn anode surface is a promising strategy for resolving these ***,we propose the use of a perovskite CaTiO3（CTO） protective layer on Zn（CTO@Zn） as a promising approach for improving the performance of *** CTO artificial layer provides an efficient pathway for Zn ion diffusion towards the Zn metal because of the high dielectric constant （εr=180） and ferroelectric characteristics that enable the alignment of dipole moments and redistribute the Zn2+ions in the CTO *** avoiding the direct contact of the Zn anode with the electrolyte solution,the uneven dendrite growth,corrosion,parasitic side reactions,and HER are mitigated,while CTO retains its mechanical and chemical robustness during ***,CTO@Zn demonstrates an improved lifespan in a symmetric cell configuration compared with bare ***@Zn shows steady overpotential （～68 m V） for 1500 h at 1 mA cm-2/0.5 mA h cm-2,excelling bare ***,when paired with the V2O5-C cathode,the CTO@Zn//V2O5-C full battery delivers 148.4 mA h g-1（based on the mass of the cathode） after 300 *** study provides new insights into Zn metal anodes and the development of high-performance AZIBs.

关键词： Perovskite

Crystallization Modulation and Holistic Passivation Enables Efficient Two‑Terminal Perovskite/CuIn(Ga)Se_(2)Tandem Solar Cells

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Nano-Micro Letters 2025年第1期17卷 205-215页

作者： Cong Geng Kuanxiang Zhang Changhua Wang Chung Hsien Wu Jiwen Jiang Fei Long Liyuan han Qifeng han Yi‑Bing Cheng yong Peng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070People’s Republic of China Triumph Photovoltaic Materials Co. Ltd.No.1001 Yannan AvenueHigh‑Tech Development DistrictBengbuAnhui 233000People’s Republic of China College of Materials Science and Engineering Guilin University of TechnologyGuilin 541004People’s Republic of China State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai 200240People’s Republic of China

Two-terminal(2-T)perovskite(PVK)/CuIn(Ga)Se_(2)(CIGS)tandem solar cells(TSCs)have been considered as an ideal tandem cell because of their best bandgap matching regarding to Shockley–Queisser(S–Q)***,the nature of the irregular rough morphology of commercial CIGS prevents people from improving tandem device *** this paper,D-homoserine lactone hydrochloride is proven to improve coverage of PVK materials on irregular rough CIGS surfaces and also passivate bulk defects by modulating the growth of PVK *** addition,the minority carriers near the PVK/C60 interface and the incompletely passivated trap states caused interface recombination.A surface reconstruction with 2-thiopheneethylammonium iodide and N,N-dimethylformamide assisted passivates the defect sites located at the surface and grain ***,LiF is used to create this field effect,repelling hole carriers away from the PVK and C60 interface and thus reducing *** a result,a 2-T PVK/CIGS tandem yielded a power conversion efficiency of 24.6%(0.16 cm^(2)),one of the highest results for 2-T PVK/CIGS TSCs to our *** validation underscores the potential of our methodology in achieving superior performance in PVK/CIGS tandem solar cells.

关键词： PVK/CIGS TSCs Irregular rough surfaces Modulating the growth PVK/C60 interface recombination