• 한국화재소방학회논문지
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• 제30권5호
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• pp.18-25
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• 2016

국내 성능위주설계 방법 및 기준에서는 다양한 입력 데이터들에 대한 입력 규정이 따로 마련되어있지 않으며, 설계자별로 인용하는 근거 데이터가 상이하여 피난허용시간과 피난완료시간에 많은 차이를 보이고 있다. 이는 성능위주 화재와 피난 시뮬레이션에 대한 신뢰도 문제와도 직결되고 있다. 시뮬레이션에 입력되는 다양한 데이터들을 표준화함으로서 설계자의 경험이나 기술능력에 무관하게 동일한 위험도의 건물에서는 동일한 결과가 도출되어야 한다. 또한 그 위험도 합당한 소방 방재설비가 설치되고 유사한 성능위주 대상 건물에서는 개연성 있는 초기투자비용이 소요됨으로서 효율적이고 효과적인 안전 확보가 이루어져야 할 것으로 판단된다.

• 국제학술발표논문집
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• The 5th International Conference on Construction Engineering and Project Management
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• pp.279-286
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• 2013

This paper introduces a new method for identification of building energy performance problems. The presented method is based on automated analysis and visualization of deviations between actual and expected energy performance of the building using EPAR (Energy Performance Augmented Reality) models. For generating EPAR models, during building inspections, energy auditors collect a large number of digital and thermal imagery using a consumer-level single thermal camera that has a built-in digital lens. Based on a pipeline of image-based 3D reconstruction algorithms built on GPU and multi-core CPU architecture, 3D geometrical and thermal point cloud models of the building under inspection are automatically generated and integrated. Then, the resulting actual 3D spatio-thermal model and the expected energy performance model simulated using computational fluid dynamics (CFD) analysis are superimposed within an augmented reality environment. Based on the resulting EPAR models which jointly visualize the actual and expected energy performance of the building under inspection, two new algorithms are introduced for quick and reliable identification of potential performance problems: 1) 3D thermal mesh modeling using k-d trees and nearest neighbor searching to automate calculation of temperature deviations; and 2) automated visualization of performance deviations using a metaphor based on traffic light colors. The proposed EPAR v2.0 modeling method is validated on several interior locations of a residential building and an instructional facility. Our empirical observations show that the automated energy performance analysis using EPAR models enables performance deviations to be rapidly and accurately identified. The visualization of performance deviations in 3D enables auditors to easily identify potential building performance problems. Rather than manually analyzing thermal imagery, auditors can focus on other important tasks such as evaluating possible remedial alternatives.

• 한국도로학회논문집
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• 제15권4호
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• pp.43-51
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• 2013

PURPOSES : The main purposes of this study are to examine the influences of polyethylene wax-based WMA additive on the optimum asphalt content of warm-recycled asphalt mixture based on the Marshall mix design and to evaluate performance of warm-recycled asphalt mixture containing 30% RAP with polyethylene wax-based WMA additive. METHODS: Physical and rheological properties of the residual asphalt were evaluated in terms of penetration, softening point, ductility and performance grade (PG) in order to examine the effects of polyethylene wax-based WMA additive on the residual asphalt. Also, To evaluate performance characteristics of the warm-recycled asphalt mixtures using polyethylene wax-based WMA additive along with a control hot-recycled asphalt mixture, indirect tensile strength test, modified Lottman test, dynamic immersion test, wheel tracking test and dynamic modulus test were conduced in the laboratory. RESULTS : Based on the limited laboratory test results, polyethylene wax-based WMA additive is effective to decrease mixing and compacting temperatures without compromising the volumetric characteristics of warm-recycled asphalt mixtures compared to hot-recycled asphalt mixture. Also, it doesn't affect the optimum asphalt content on recycled-asphalt mixture. All performance test results show that the performance of warm-recycled asphalt mixture using polyethylene wax-based WMA additive is similar to that of a control hot-recycled asphalt mixture. CONCLUSIONS: Overall, the performance of warm-recycled asphalt mixture using polyethylene wax-based WMA additive is comparable to hot-recycled asphalt mixture.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 2004년도 춘계공동학술대회 논문집
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• pp.163-166
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• 2004

This paper proposes decomposition-based approach for developing the evaluation factors of performance measures and designing performance measures in manufacturing system. In this paper, the evaluation factors are designed by design decomposition approach and the design process of performance measures is based on the manufacturing system design decomposition.

• 경영과학
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• 제21권2호
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• pp.167-189
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• 2004

Cooperative and integrative partnerships between buyers and suppliers are very important for effective operations. Such partnerships should be based on various information technologies developed in recent years. Therefore, we investigated the relationship among IT performance, IT infrastructure and supply chain performance in buyer-supplier linkage using exploratory examination. This analysis is based on survey results of buyer-supplier practitioners in Korean electronics industry. Specifically, we used factor analysis, correlation analysis, and regression analysis. Major findings are as follows. First. buyers' IT performance contributed to enhance their operational & financial performance, and satisfaction. Second, buyers' IT infrastructure improved their financial performance and satisfaction but showed mixed effects on operational performance. Third, suppliers' operational performance enhanced buyers' operational & financial performance, and satisfaction. Fourth, suppliers' IT performance strengthened their operational & financial performance, and satisfaction. Fifth, suppliers' IT infrastructure showed positive relationships with operational performance and satisfaction.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2008년도 춘계 학술발표회 제20권1호
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• pp.125-128
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• 2008

오늘날 많은 연구기관에서 구조물 설계에 관한 연구가 수행되고 있는 가운데 내진분야에서 처음으로 구조물에 대한 성능기반설계에 대한 기본개념이 제시되었다. 이후 여러 연구기관에서 성능기반설계를 수행하기 위해 사용자와 설계자 간의 의사소통을 원활히 이루어지게 하기 위해 요구성능에 대한 기준을 정립를 하였다. 성능기반설계는 구조물이 위치하게 될 지역적 특성이나 구조물의 특성에 따라 구조물에 발생될 수 있는 위험에 대한 정확한 분석과 구조물에 대한 사회적 경제적 환경적 영향에 대한 분석을 통하여 구조물에 요구되는 요구성능에 맞추어 구조물을 설계하여 공용기간동안 구조물에 대한 안전을 보장하는 설계방법이다. 구조물에 대한 정확한 요구성능을 파악하기 위해 성능수준 및 성능목표에 대한 정의가 필요하여 본 연구에서 성능기반설계를 수행하기 위해 ATC-40(2002), FEMA-273(1997), Eurocode(1998)에서의 요구성능기준에 관한 기초자료를 조사하였다.

• Earthquakes and Structures
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• 제22권1호
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• pp.95-107
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• 2022

This paper introduces a novel, rigorous, and efficient probabilistic methodology for the performance-based optimal design (PBOD) of semi-active tuned mass damper (SATMD) for seismically excited nonlinear structures. The proposed methodology is consistent with the modern performance-based earthquake engineering framework and aims to design reliable control systems. To this end, an optimization problem has been defined which considers the parameters of control systems as design variables and minimization of the probability of exceeding a targeted structural performance level during the lifetime as an objective function with a constraint on the failure probability of stroke length damage state associated with mass damper mechanism. The effectiveness of the proposed methodology is illustrated through a numerical example of performance analysis of an eight-story nonlinear shear building frame with hysteretic bilinear behavior. The SATMD with variable stiffness and damping have been designed separately with different mass ratios. Their performance has been compared with that of uncontrolled structure and the structure controlled with passive TMD in terms of probabilistic demand curves, response hazard curves, fragility curves, and exceedance probability of performance levels during the lifetime. Numerical results show the effectiveness, simplicity, and reliability of the proposed PBOD method in designing SATMD with variable stiffness and damping for the nonlinear frames where they have reduced the exceedance probability of the structure up to 49% and 44%, respectively.

• Smart Structures and Systems
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• 제32권4호
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• pp.207-218
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• 2023

Real-time monitoring of the behavior of reinforced soil retaining wall (RSW) is required for safety checks. In this study, a targetless displacement measurement technology (TDMT) consisting of an image registration module and a displacement calculation module was proposed to monitor the behavior of RSW, in which facing displacement and settlement typically occur. Laboratory and field experiments were conducted to compare the measuring performance of natural target (NT) with the performance of artificial target (AT). Feature count- and location-based performance metrics and displacement calculation performance were analyzed to determine their correlations. The results of laboratory and field experiments showed that the feature location-based performance metric was more relevant to the displacement calculation performance than the feature count-based performance metric. The mean relative errors of the TDMT were less than 1.69 % and 5.50 % for the laboratory and field experiments, respectively. The proposed TDMT can accurately monitor the behavior of RSW for real-time safety checks.

• International Journal of Advanced Culture Technology
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• 제12권1호
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• pp.190-201
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• 2024

This study examined the effect of the distance Infection Control Education Program (ICEP), developed based on the ADDIE model, on infection control knowledge, attitude, and performance among care workers in long-term care facilities nationwide. The program, developed based on the ADDIE model, was applied to 173 care workers directly responsible for nursing care of elderly residents in lomg-term care facilities. The distance ICEP for care workers was conducted through the website and lasted 30 minutes for each of the eight topics. To determine the effectiveness of the education, infection control knowledge, attitude, performance, and satisfaction were surveyed before and four weeks after the program. Differences in infection control knowledge, attitude, and performance before and after the distance ICEP were assessed by a t-test. A significant difference was observed in knowledge and infection control performance after the distance ICEP was administered to care workers. In the sub-domains of infection control performance, overall understanding of infection, regular infection control education, infection control by special pathogen (multidrug-resistant bacteria, tuberculosis, tick-borne infectious diseases), and detailed infection control education by infection site (pressure ulcers and urinary tract infections) were significantly improved. Infection control knowledge and performance improved through the distance ICEP applied to care workers. Satisfaction also displayed high scores on most items and indicated that it was helpful for infection control in facilities, confirming the effectiveness of infection control education. Based on the survey of care workers nationwide, the infection education program can be effectively used for care workers in the future.

• 한국화재소방학회논문지
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• 제33권5호
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• pp.155-162
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• 2019

우리나라에서는 건축물의 화재안전을 확보하기 위해 관련 법령을 개정하여 2011년 이후 대규모 특정소방대상물을 대상으로 성능위주설계를 시행하고 있다. 하지만 아직 우리나라 성능위주설계는 기존의 방식과 비교해보았을 때 화재·피난 시뮬레이션을 통한 인명안전성평가가 추가된 수준에 그치고 있다. 성능위주설계 의무화 이전부터 관련 연구 또한 지속적으로 이루어져 왔으나 주로 행정·제도적 개선방안이나 컴퓨터 시뮬레이션에 치우쳐 소방시설의 설계나 시공 등과 관련된 내용에 대해서는 상대적으로 아쉬움이 큰 것도 사실이다. 이에 본 연구에서는 실제 시행 초기단계인 2016년까지 전국적으로 수행된 91편의 성능위주설계 사전심의도서를 수집하여 소방시설에 대한 성능위주설계 현황을 분석하여 문제점을 도출하였다. 그 결과, 소화설비를 제외한 소방시설들은 성능위주설계가 제대로 이루어지지 않고 있었고, 설계자들은 기존의 법규위주설계에 비해 추가적으로 해당설비를 더 설치하거나 업그레이드된 성능을 가진 상위설비를 설치하면 성능위주설계를 수행하였다는 판단을 하고 있는 것으로 나타났다.