• Structural Engineering and Mechanics
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• 제6권3호
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• pp.259-274
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• 1998

The test results from non-destructive and destructive field testing of a three-span deteriorated reinforced concrete slab bridge are used as a vehicle to examine the reliability of available tools for finite-element analysis of in-situ structures. Issues related to geometric modeling of members and connections, material models, and failure criteria are discussed. The results indicate that current material models and failure criteria are adequate, although lack of inelastic out-of-plane shear response in most nonlinear shell elements is a major shortcoming that needs to be resolved. With proper geometric modeling, it is possible to adequately correlate the measured global, regional, and local responses at all limit states. However, modeling of less understood mechanisms, such as slab-abutment connections, may need to be finalized through a system identification technique. In absence of the experimental data necessary for this purpose, upper and lower bounds of only global responses can be computed reliably. The studies reaffirm that success of finite-element models has to be assessed collectively with reference to all responses and not just a few global measurements.

• 국제학술발표논문집
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• The 6th International Conference on Construction Engineering and Project Management
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• pp.532-536
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• 2015

This paper presents an automated computer vision-based system to update BIM data by leveraging multi-modal visual data collected from existing buildings under inspection. Currently, visual inspections are conducted for building envelopes or mechanical systems, and auditors analyze energy-related contextual information to examine if their performance is maintained as expected by the design. By translating 3D surface thermal profiles into energy performance metrics such as actual R-values at point-level and by mapping such properties to the associated BIM elements using XML Document Object Model (DOM), the proposed method shortens the energy performance modeling gap between the architectural information in the as-designed BIM and the as-is building condition, which improve the reliability of building energy analysis. The experimental results on existing buildings show that (1) the point-level thermography-based thermal resistance measurement can be automatically matched with the associated BIM elements; and (2) their corresponding thermal properties are automatically updated in gbXML schema. This paper provides practitioners with insight to uncover the fundamentals of how multi-modal visual data can be used to improve the accuracy of building energy modeling for retrofit analysis. Open research challenges and lessons learned from real-world case studies are discussed in detail.

• 전자통신동향분석
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• 제14권4호통권58호
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• pp.1-9
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• 1999

In this paper, we summarize the lessons learned from the applications of the software reliability engineering to a large-scale software project. The considered software is the software system of the TDX-10 ISDN switching system. The considered software consists of many components, called functional blocks. These functional blocks serve as the unit of coding and test. The software is continuing to be developed by adding new functional blocks. We are mainly concerned with the analysis of the effects of these software components to software reliability and with the analysis of the reliability evolution. We analyze the static characteristics of the software related to software reliability using failure data collected during system test. We also discussed a pattern which represents a local and global growth of the software reliability as version evolves. To find the pattern of software of the TDX-10 ISDN system, we apply the S-shaped model to a collection of failure data sets of each evolutionary version and the Goel-Okumoto (G-O) model to a grouped overall failure data set. We expect this pattern analysis will be helpful to plan and manage necessary human/resources for a new similar software project which is developed under the same developing circumstances by estimating the total software failures with respect to its size and time.

• 보건행정학회지
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• 제31권3호
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• pp.312-327
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• 2021

Background: Infection prevention and control (IPC) to manage healthcare-associated infection (HCAI) has emerged as one of the most significant public health issues in Korea. The purpose of this study is to draw implications in IPC policies by analyzing the context, process, and major actors in policy development and comparatively analyzing IPC policy contents of Korea with three other countries. Additionally, IPC policies were analyzed in the context of coronavirus disease 2019 (COVID-19) to provide implications for future pandemics and HCAI events. Methods: This study incorporates a qualitative approach based on document and content analysis, applying codes and thematic categorization. IPC policy contents are comparatively analyzed by adopting the concept model, developed by the World Health Organization, which consists of core components of IPC structure at the national and facility level. Results: National IPC policies were developed within a complex social and political context, through the involvement of various stakeholders. IPC policies in Korea place a high emphasis on establishing IPC programs and built environments in healthcare facilities, whereas there were potentials for improvement in policies involving patients and promoting a safety culture. IPC policies, which currently focus on general hospitals and certain functions of hospitals, should further be expanded to target all healthcare facilities and functions, to ensure more efficient and sustainable IPC responses in the current and future disease outbreaks. Conclusion: IPC is a complex policy arena and lessons learned from the analysis of existing policies in the context of COVID-19 should provide valuable strategic implications for future policies.

• 한국과학교육학회지
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• 제24권5호
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• pp.902-915
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• 2004

과학교육 매체로서 연극의 활용가능성을 탐색하기 위해 초등학생의 수준에 적절한 과학 연극 두 편을 개발하고, 개발된 과학 연극을 학교 현장에서 지도함으로써 과학 연극을 통한 과학 교수 학습의 효과를 살펴보았다. 개발한 연극은 미국의 원자폭탄 개발을 다룬 '맨해튼 계획'과 혈액형의 유전 방법을 다룬 '엄마, 난 O형 이래요' 두 가지로 전자는 과학 논쟁 연극이고, 후자는 과학 개념 연극이다. 또한 6단계로 구성된 과학 연극 수업 모형과 지도 교사를 위한 지도안을 구성하였다. 과학 개념 연극은 3학년 학생을 대상으로 실시하였고, 과학 논쟁 연극은 5학년 학생을 대상으로 실시하였다. 지도 교사는 연극 수업의 준비, 실시과정에서 일지를 통해 학급에서 일어났었던 일과 이에 대한 자신의 생각을 정리하였으며, 과학 연극 수업은 비디오로 녹화 분석되었다. 또 과학 연극에 대한 학생의 반응을 알아보기 위해 일부 학생을 대상으로 면담을 실시하고, 전체 학생을 대상으로 설문을 실시하였다. 면담은 연극 참여 학생 일부와 관람 학생 일부를 대상으로 지도 교사가 연극 수업 직후 비형식적 방법으로 실시하였다. 수업 직후 실시된 설문에서는 과학 연극 수업에 대한 반응을 5점 척도로 조사하고(4문항), 수업 전후의 생각을 비교하게 하거나 수업을 통해 알게 된 내용을 쓰도록 하였다. 연구 결과 두 과학 연극 수업에 대한 학생들과 지도교사의 반응은 매우 긍정적이었으며, '맨해튼 계획' 보다는 '엄마, 난 O형 이래요' 가, 남학생보다는 여학생이 좀 더 긍정적인 반응을 보였으며 또 다른 과학 연극 수업을 기 대하기도 하였다. '엄마, 난 O형 이래요' 의 경우 연극에서 다룬 과학 지식의 내용을 대부분의 학생들(93%)이 잘 이해했으며, '맨해튼 계획' 의 경우 연극 관람 후, 원자폭탄의 사회적 이용에 대한 보다 다양한 책임 소재를 인식하였다. 그러나 핵의 위력(위험성)과 원자폭탄의 피해 상황을 부각하여 인식하는 경향도 발견되었다. 이러한 결과는 과학 연극 수업시, 주제와 관련된 학습 활동이나 토론 등을 보다 적극적으로 계획하고 실시하는 것이 필요함을 시사한다. 한편 지도 교사는 연극이라는 형식이 매우 새롭고 다른 수업 방법으로 다루기 어려운 내용을 지도할 수 있음을 인식하였으며 과학 연극 수업에 학생들의 흥미와 참여도가 높은 것에 대해 만족해했다. 그러나 두 경우 모두 이러한 과학 연극 수업이 정규 수업 외에 교사가 별도의 시간을 할애하여 준비해야 한다는 점에서 어려움이 있음을 지적하였다.

• 한국지반신소재학회논문집
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• 제4권1호
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• pp.17-25
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• 2005

본 논문에서는 옹벽 시공 완료 후 여름철 집중강우로 인해 붕괴된 보강토 옹벽 사고사례에 대한 원인 분석을 실시하였다. 사고 원인의 명확한 규명을 위해 붕괴된 옹벽의 현장조사 및 실내시험, 현 설계법에 근거한 안정성평가, 강우의 침투해석 및 suction을 고려한 사면안정해석을 실시하였고, 그 결과 현장조건을 제대로 반영하지 못한 부적합한 설계와 불량한 뒤채움 흙의 사용, 단기간의 집중호우로 인한 suction의 감소 및 전단강도의 감소가 붕괴의 주원인인 것으로 나타났다.

• 국제학술발표논문집
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• The 9th International Conference on Construction Engineering and Project Management
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• pp.721-727
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• 2022

Construction safety remains an ongoing concern, and project managers have been increasingly forced to cope with myriad uncertainties related to human operations on construction sites and the lack of a skilled workforce in hazardous circumstances. Various construction fatality monitoring systems have been widely proposed as alternatives to overcome these difficulties and to improve safety management performance. In this study, we propose an intelligent, automatic control system that can proactively protect workers using both the analysis of big data of past safety accidents, as well as the real-time detection of worker non-compliance in using personal protective equipment (PPE) on a construction site. These data are obtained using computer vision technology and data analytics, which are integrated and reinforced by lessons learned from the analysis of big data of safety accidents that occurred in the last 10 years. The system offers data-informed recommendations for high-risk workers, and proactively eliminates the possibility of safety accidents. As an illustrative case, we selected a pilot project and applied the proposed system to workers in uncontrolled environments. Decreases in workers PPE non-compliance rates, improvements in variable compliance rates, reductions in severe fatalities through guidelines that are customized according to the worker, and accelerations in safety performance achievements are expected.

• 통상정보연구
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• 제12권1호
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• pp.203-224
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• 2010

With the launching WTO, the world economy has been changing new competitive environment. Agricultural exports should be pursued actively in the market of opening era to develop the foreign agricultural product market and to improve the domestic agribusiness quality and strengthen its competitiveness. The purpose of this is paper is to understand agricultural export status of Korea to detect challenges and matter for improvement, to find new measures of export strategy for the foreign market, recent emerging export promotion with high potential growth, and to increase Korea agricultural export to new world market by using a new method. The profit and loss status is volatile since the agricultural export is in its infancy. However, we have learned lessons from previous success and failure that prior analyzing of agricultural export feasibility, phased-in expansion of agri-food export volume, connection of agri-food export and agri-food market policy. In relation to this, this paper introduces Efficient and Effective Utilization of Communal Facilities in agri-food export. Consequently, First, Export promotion scheme for agri-food is to precise analysis of import countries and to collection agri-food export procedure and agri-food market system. Second, In order to expand export agricultural products to new world market, we need to direct 3rd support program to enhancing competitiveness in expanding export of agricultural export.

• 지식경영연구
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• 제16권2호
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• pp.91-111
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• 2015

Social media marketing has gained attention from marketers due to the growing number of social media users. Marketers around the globe have a serious concern over how to utilize social media as a successful marketing tool. Many of them show a lack of understanding of the essential feature of social media and effective social media marketing strategies, which brings about a higher chance of social media marketing failures. Analyzing the failure cases of social media marketing is vital because it provides rich insights for marketing experts who have difficulty in developing effective social media marketing strategies. Therefore, this study conducted multiple case studies by selecting five failure cases of social media marketing which we defined as paradigmatic social media marketing failures which happened in the last five years in South Korea. From the case studies, we derived five successful social media marketing strategies. This study has a theoretical implication because it is the first to suggest effective social media marketing strategies based on the analysis on social media marketing failure cases. It also has a practical implication since it proposes specific social media marketing strategies which can help facilitate successful social media marketing.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2003년도 추계학술대회 논문집(II)
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• pp.305-310
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• 2003

This study is intended to outline the lessons that can be learned from European experience of the opportunities and challenges involved in operating train ferries to carry freight. The study considers the various train ferry routes that have operated over recent years in Europe, examines their characteristics, and then proceeds to evaluate the economic viability of train ferries in general. On the basis of this analysis, we have attempted to outline the conditions that appear to be required under which Train Ferries may be competitive. This study shows that long crossing train ferries in Europe have survived where the adjacent railway systems handle a significant volume of domestic traffic and do themselves playa serious role in the transport industry. There is no reason to suppose railway wagons cannot be carried economically over long distances. Experience in Western Europe is that they are best operated as mixed road trailer and rail wagon services. Only the lower deck need carry railway wagons, which greatly simplifies loading and the physical construction of the ship. Existing road based ro-ro ferries can be adapted to become rail ferries. It is, however, essential that there is commercial clarity as to the responsibility for ensuring the overall service is viable. To that end, the ferry company is responsible for marketing the service and managing relationships between the two railway authorities.