• 한국공간구조학회논문집
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• 제22권4호
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• pp.39-48
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• 2022

The energy dissipation of inverted V-type eccentric steel braced frames can be achieved through the yielding of a slit link, through yielding of a number of strips between slits when the frame is subjected to inelastic cyclic deformation. On the other hand, the development of seismic resistance system without residual deformation is obtained by applying the superelasdtic shape memory alloy (SMA) material into the brace and link elements. This paper presents results from a systematic three-dimensional nonlinear finite element analysis on the structural behavior of the eccentric bracing systems subjected to cyclic loadings. A wide scope of structural behaviors explains the horizontal stiffness, hysteretic behaviors, and failure modes of the recentering eccentric bracing system. The accurate results presented here serve as benchmark data for comparison with results obtained using modern experimental testing and alternative theoretical approaches.

• 국제초고층학회논문집
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• 제12권2호
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• pp.163-168
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• 2023

Today 55 percent of the population in the world lives in urban areas which is expected to increase to 68 percent by the year 2050. In the cities, high-rise buildings as symbols of the modern cityscape are dominating the skylines, but the data to demonstrate their embodied energy and environmental impacts are scarce, compared to low- or mid-rise buildings. Reducing the embodied energy and environmental impacts of buildings is critical as about 42 percent of primary energy use and 39 percent of the global greenhouse gas (GHG) emissions come from the building sector. However, it is an overlooked area in embodied energy and environmental impacts of high-rise buildings. Life cycle assessment (LCA) is a widely used tool to quantify the embodied energy and environmental impacts of the building sector. LCA combined with Building Information Modeling (BIM) can simplify data acquisition of the building as well as provide both tools with feedback. Several studies recognize that the integration of BIM and LCA can simplify data acquisition of the building as well as provide tools with feedback. This article provides an overview of literature on BIM-based of embodied energy and environmental impacts of high-rise buildings. It also compares with different LCA methodologies. Finally, major strategies to reduce embodied energy and environmental impacts of high-rise buildings, research limitations and trends in the field are covered.

• 한국군사과학기술학회지
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• 제26권3호
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• pp.281-301
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• 2023

The shipboard combat system is a key system for naval combat that supports a command and control process cycle consisting of Detect - Control - Engage in real time to ensure ship viability and conduct combat missions. Modern combat systems were developed on the basis of Open Architecture(OA) to maximize acceptance of latest technology and interoperability between systems, and actively introduced the COTS(Commercial-of-the-shelf). However, as a result of that, vulnerabilities inherent in COTS SW and HW also occurred in the combat system. The importance of combat system cybersecurity is being emphasized but cybersecurity research reflecting the characteristics of the combat system is still lacking in Korea. Therefore, in this paper, we systematically identify combat system threats by applying Data Flow Diagram, Microsoft STRIDE threat modelling methodology. The threats were analyzed using the Attack Tree & Misuse case. Finally we derived the applicable security requirements which can be used at stages of planning and designing combat system and verified security requirements through NIST 800-53 security control items.

• Earthquakes and Structures
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• 제24권2호
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• pp.97-109
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• 2023

This experimental study investigates the effectiveness of applying carbon fiber reinforced polymer (CFRP) jackets for the retrofit of short reinforced concrete (RC) columns with inadequate transverse reinforcement and stirrup spacing to longitudinal rebar diameter equal to 12. RC columns scaled at 1/3, with round and square section, were subjected to axial compression up to failure. A damage scale is introduced for the assessment of the damage severity, which focusses on the extent of buckling of the longitudinal rebars. The damaged specimens were subsequently repaired with unidirectional CFRP jackets without any treatment of the buckled reinforcing bars and were finally re-tested to failure. Test results indicate that CFRP jackets may be effectively applied to rehabilitate RC columns (a) with inadequate transverse reinforcement constructed according to older practices so as to meet modern code requirements, and (b) with moderately buckled bars without the need of previously repairing the reinforcement bars, an application technique which may considerably facilitate the retrofit of earthquake damaged RC columns. Factors for the estimation of the reduced mechanical properties of the repaired specimens compared to the respective values for intact CFRP-jacketed specimens, in relation to the level of damage prior to retrofit, are proposed both for the compressive strength and the average modulus of elasticity. It was determined that the compressive strength of the retrofitted CFRP-jacketed columns is reduced by 90% to 65%, while the average modulus of elasticity is lower by 60% to 25% in respect to similar undamaged columns jacketed with the same layers of CFRP.

• 국제학술발표논문집
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• The 9th International Conference on Construction Engineering and Project Management
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• pp.551-562
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• 2022

The building production system has been analysed by the dichotomy "employer-contractor" relationship, which failed to take into account of the role and function of multiple stakeholders within the life-cycle supply chain. This is further observed in the current conflict resolution model, which, in my argument, struggles to contribute to industrialize the building production and achieve better efficiency and effectiveness as expected. The purpose of this paper is to critically assess the issues of current programme-based conflict resolution model, and discuss alternative models how they can be modelled and applied to the construction projects. The conclusions of findings are; First, the current model is framed around the contracts and dispute resolutions based on the legal concept of "claimant and respondent" where one party(s) advances a claim once and the other(s) objects, as such it fails to reflect the nature of construction projects where multiple stakeholders are involved concurrently and for a long period of life-cycle of buildings. Second, an alternative is "Six-stakeholders model" which represents the multiple stakeholders and clarifies the flow of obligation-liability-monetary relationships among participants for a long period of life-cycle of buildings. Further, with reference to both historical and recent cases, a reflection and insight into pros and cons of programming method is added, especially as to why this method is considered to have become a mandate of the modern construction management, and how academics and practitioners should deal with it more cautiously and prudently.

• 국제학술발표논문집
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• The 7th International Conference on Construction Engineering and Project Management Summit Forum on Sustainable Construction and Management
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• pp.201-209
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• 2017

Facade structure system plays an important role in modern architecture and design. Many contractors start using Building Information Modeling (BIM) to help design and lay-out façade walls in recent years. However, there are still some users refuse to accept BIM on façade construction. Therefore, we employed Technology Acceptance Model (TAM) to assess the users acceptable of BIM work flow, with using a practical case of facade construction in Chongqing Wanda City. The factors that will affect the builder's decision of whether using BIM or not when construct façade, and the relationship among them will be found via this model. Through the analysis using TAM, this research found that the direct factors influencing the completely acceptance of BIM in façade construction is the BIM quality and Result Demonstrating, and the parameter impacting the intuition engendering is the Exterior Condition. Therefore, this paper proposes a more systemic model of BIM acceptance in curtain wall to analyze the user's acceptance. The solution can also offer a reference for future research and construct on façade structure. The acceptance model has the significance that it can help to analyze the reason why users refuse to use BIM in façade construction, thus to help users accept BIM.

• 문화기술의 융합
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• 제9권6호
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• pp.737-742
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• 2023

이 논문은 오스망에 의해 주도된 파리의 변화를 발작과 보들레르의 작품에 등장하는 배회자를 통해서 분석하려는 시도이다. 두 작가의 작품 모두 근대성을 표상하는 배회자가 파리의 시가지, 특히 건축물들을 관조한다. 근대성을 표상함에도 불구하고, 배회자들은 양가적으로 과거의 유산에 빠져있기도 하다. 발작의 『파리의 그릇된 면모』에서 남성 부르주아인 고드프와는 과거의 유산인 오래된 건축물들을 관조하는 배회자이다. 보들레르의 시 「빅토르 위고를 위한 백조」에서 근대의 카루셀을 지나는 배회자는 과거의 파리가 사라진 것을 느낀다. 「파리의 꿈」에서 환영화된 파리는 나폴레옹 3세가 장려한 자본주의적 활동에 의해 형성된 대도시의 이미지를 보여준다. 두 작가의 차이는 근대성이 파리를 어떻게 변모시켰는지를 예시해주고 있다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제18권4호
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• pp.959-979
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• 2024

Rice pest identification is essential in modern agriculture for the health of rice crops. As global rice consumption rises, yields and quality must be maintained. Various methodologies were employed to identify pests, encompassing sensor-based technologies, deep learning, and remote sensing models. Visual inspection by professionals and farmers remains essential, but integrating technology such as satellites, IoT-based sensors, and drones enhances efficiency and accuracy. A computer vision system processes images to detect pests automatically. It gives real-time data for proactive and targeted pest management. With this motive in mind, this research provides a novel farmland fertility algorithm with a deep learning-based automated rice pest detection and classification (FFADL-ARPDC) technique. The FFADL-ARPDC approach classifies rice pests from rice plant images. Before processing, FFADL-ARPDC removes noise and enhances contrast using bilateral filtering (BF). Additionally, rice crop images are processed using the NASNetLarge deep learning architecture to extract image features. The FFA is used for hyperparameter tweaking to optimise the model performance of the NASNetLarge, which aids in enhancing classification performance. Using an Elman recurrent neural network (ERNN), the model accurately categorises 14 types of pests. The FFADL-ARPDC approach is thoroughly evaluated using a benchmark dataset available in the public repository. With an accuracy of 97.58, the FFADL-ARPDC model exceeds existing pest detection methods.

• 한국전통조경학회지
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• 제36권1호
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• pp.20-33
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• 2018

본 연구는 서양인들의 시각에서 조선이 근대화되기 시작한 19세기말 조선의 경관을 조명하는데 목적이 있으며, 서양인들의 경관 관련 기록의 역사적 의미를 도출하고 이에 대한 경관의 유형화 및 그들의 인식을 분석한 결과는 다음과 같다. 첫째, 당시 조선을 방문했던 서양인들은 조선의 역사적, 정치적 상황에 개입되거나 오랜 기간 여행을 통해 조선의 문화를 이해하고 있으며, 이에 대한 설명이 여러 저서에서 공통으로 확인되는 점은 그들의 기록을 통해 당시의 경관을 조명하는 과정이 유의한 것으로 보인다. 둘째, 서양인들의 기록에 나타나는 조선의 경관은 소도시 및 마을, 자연환경, 명승 고적, 근대시설, 경작지 등이 주로 언급되었다. 소도시 및 마을은 허름한 뒷골목과 빼곡히 들어선 가옥들이 주로 언급되고 있으며, 자연경관은 산악경관과 해안 및 하천을 따라 펼쳐지는 다양한 지형경관과 주변식생이 확인되었다. 궁궐과 산성, 사찰 등은 명승 고적의 주요 대상으로 기록되었으며 근대화된 시설에는 외국인 공사관 및 거류지, 교회나 학교 등의 서양식 건축이 언급되고 있었다. 경작지는 낙후되고 방치된 모습이 확인되었으나, 조망구도가 넓어질수록 평화롭고 번창한 분위기의 농촌경관으로 비춰지고 있었다. 셋째, 조선에 대한 당시 서양인들의 인식은 비위생적이고 낙후된 주거환경에 대한 부정적 인식과 빼어난 산수와 수려한 명승고적, 상류층의 주택정원을 대상으로 하는 긍정적 인식이 나타났다. 근대화된 경관에 대해서는 문명화된 경관 개선이라는 점에서 긍정적 인식이 형성되었으며, 전통경관의 훼손 및 이질감에 대한 부정적 인식이 유사한 양상을 보이고 있었다.

• 헤리티지:역사와 과학
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• 제43권1호
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• pp.128-159
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• 2010

국내 명승 지정 추이와 유형 및 변천 그리고 분류상의 제문제를 검토하고 국가 지정 문화재인 명승 총 68건을 대상으로 전래팔경 및 동천구곡 그리고 현대팔경과의 연관성을 추적하여 전래경승적 의미와 가치가 현재에도 유전되고 있음을 밝히고자 한 본 연구의 주요 결과는 다음과 같다. 첫째, 역사 문화경관적 성격을 갖는 명승의 지정이 늘고 있음은 초기 문화재보호법상 지정 사유로 명기된 문화적 활용성 역사성 문학성 사상적 배경 등의 개념을 적극 수용하기 위한 취지로 이해됨에 따라 고정원과 전망점 등 문화적 명소 개념이 명승 지정의 중요 기준으로 자리 잡고 있음은 매우 고무적 현상이다. 둘째, 명승 지정 유형별로 분류하면 '자연경관이 뛰어난 곳'이 30건(44.16%), '저명한 건물 또는 정원 및 중요한 전설지' 21건(30.9%),' 저명한 경관 전망지점' 9건(13.2%) '역사 문화 경관적 가치가 뛰어난 곳' 7건(10.3%) 그리고 '동 식물의 서식지로서 경관이 뛰어난 곳' 1건 순으로 분석되었다. 셋째, 현재 명승 분류기준에 따르면 팔경지로 분류되는 명승은 7건, 동천으로 분류되는 명승은 3건이며 구곡으로 분류되는 명승은 없는 것으로 볼 때, 외형적으로 전체 명승 중 팔경 및 동천구곡으로 분류되는 명승은 도합 10건(14.7%)에 지나지 않는다. 넷째, 문헌자료 및 인터넷 분석에 따른 전래팔경 관련 명승은 46건(67.7%)이고 이 중 경관대상(장)으로 팔경에 포함된 명승은 38건(55.9%), 경관시점(장)으로 팔경에 포함된 명승은 8건(11.8%)으로 집계됨에 따라 총 46건(67.7%)의 명승이 전래팔경과 관련된 명승으로 분석되었다. 다섯째, 동천과 관련된 명승은 8건(11.8%)이었고 구곡과 관련된 명승은 4건(5.9%)이었으며, 총 40건(48.9%)의 명승이 현대팔경으로 설정되어 지역 명소로서의 역활과 관광홍보 콘텐츠로 활용되고 있음을 확인하였다. 여섯째, 전래팔경 및 현대팔경 또는 동천구곡과 관련된 명승은 총 62건(91.2%)으로 외형적 분류와는 달리 지정 명승 대부분은 경관에 내재된 역사적 문화적 의미와 깊숙이 관련되고 있음을 확인하였다.