• Advances in concrete construction
• /
• 제14권3호
• /
• pp.195-204
• /
• 2022

As a brittle failure mode, punching-shear failure can be widely found in traditional RC slab-column connections, which may lead to the entire collapse of a flat plate structure. In this paper, a novel RC slab-column connection with inner steel truss was proposed to enhance the punching strength. In the proposed connection, steel trusses, each of which was composed of four steel angles and a series of steel strips, were pre-assembled at the periphery of the column capital and behaved as transverse reinforcements. With the aim of exploring the punching behavior of this novel RC slab-column connection, a static punching test was conducted on two full-scaled RC slab specimens, and the crack patterns, failure modes, load-deflection and load-strain responses were thoroughly analyzed to explore the contribution of the applied inner steel trusses to the overall punching behavior. The test results indicated that all the test specimens suffered the typical punching-shear failure, and the higher punching strength and initial stiffness could be found in the specimen with inner steel trusses. The numerical models of tested specimens were analyzed in ABAQUS. These models were verified by comparing the results of the tests with the results of the analyzes, and subsequently the sensitivity of the punching capacity to different parameters was studied. Based on the test results, a modified critical shear crack theory, which could take the contribution of the steel trusses into account, was put forward to predict the punching strength of this novel RC slab-column connection, and the calculated results agreed well with the test results.

• 방사성폐기물학회지
• /
• 제5권1호
• /
• pp.53-64
• /
• 2007

고연소도 경수로사용후핵연료를 이용하여 voloxidation 및 소결 열처리 공정으로부터 세슘의 시간에 따른 방출 거동을 실험적으로 평가하였다. 사용후핵연료 voloxidation 공정에서는 fragment 형태의 시편을 사용하여 최대 $1,500^{\circ}C$의 산화 및 환원 분위기에 따른 세슘 방출 거동을 상호 비교하였으며, 소결 공정에서는 압분체를 이용하여 4% H2/Ar 환원분위기 에서 열처리 온도 변화에 따른 세슘방출 특성 변화를 분석하였다. 산화 분위기에서 fragment 형태의 사용후핵연료로부터 세슘 방출 온도 구간은 $800{\circ}C{\sim}1,200^{\circ}C$였으며, 환원 분위기에서 압분체로부터 방출 온도 구간은 $1,100{\circ}C{\sim}1,400^{\circ}C$로서, 산화에 의한 사용후핵 연료의 분말화가 세슘 방출 거동에 영향을 미치는 것으로 나타났다. 아울러 사용후핵 연료로부터 세슘 방출 거동에 영향을 미치는 주요 인자는 사용후핵 연료내 세슘 화합물의 화학적 형태뿐만 아니라 결정립 및 핵연료 표면으로의 확산 속도에 지배를 받음을 알 수 있었다.

• 한국조경학회지
• /
• 제40권2호
• /
• pp.24-37
• /
• 2012

본 연구에서는 커뮤니티 가든의 다양한 국내외 사례 및 선진 연구동향에 대해서 알아보고, 커뮤니티 가든의 개념에 대해서 참가자그룹이 주체적으로 운영해 나가면서 안전한 먹거리를 생산할 수 있는 커뮤니티의 장의 확보,지역을 활성화해 나가는 새로운 형태의 도시녹지 확보방안, 도시재생운동의 의미로서 정의해 보았다. 나아가 열악한 복지관 환경을 개선하기 위한 목적으로 실험적으로 시도하여 조성한 장애인복지관 옥상의 커뮤니티 가든 사례지를 대상으로 하여 이의 계획 및 공사과정, 파트너십 참여, 사업비용 분담 등의 과정을 고찰하였다. 본 실험적 조성사업의 예산확보를 비롯한 전 과정은 부산그린트러스트와 100만평문화공원조성범시민협의회가 주관 하였다. 공동모금회를 통한 스탠다드챠타드 SC제일은행의 50%의 기금분담과 자원봉사의 참여, 그리고 부산시와 사하구의 행정적 지원, 그 외에 다양한 파트너십에 의한 참여의 시도 및 역할 분담은 커뮤니티 가든 실험적 조성의 핵심이 되었다. 조성된 커뮤니티 가든의 공간은 장애인복지관 이용자들의 먹거리생산, 도시농업체험 프로그램에의 참여,원예치료, 커뮤니티의 장과 문화공간의 제공이란 점에서 성과가 있었다. 나아가 옥상형 커뮤니티 가든은 이동식과 고정식 플랜터를 조합 응용한 저비용형 옥상커뮤니티 가든의 개발이란 점에서 그 의미를 찾을 수 있었다. 본 연구에서 검토한 복지관의 옥상을 활용한 실험적인 커뮤니티 가든 조성사례는 도시환경의 개선, 커뮤니티 장의 확보, 도시재생 및 도시녹지의 확보 측면에서도 유익한 것으로 나타났으며, 이는 앞으로 커뮤니티 가든의 활성화에 기여할 수 있는 기초자료로서 활용될 수 있을 것이다.

• 지능정보연구
• /
• 제29권3호
• /
• pp.287-316
• /
• 2023

최근 전 세계적으로 기업의 환경(Environmental)·사회(Social)·지배구조(Governance)의 비재무적 요소를 고려한 지속가능경영이 필수적으로 요구되면서, 각 기업들은 이에 대응할 수 있는 전략적 방향 수립이 중요해지고 있다. 특히 기업이 속한 산업별로 상이한 ESG 이슈에 대한 이해를 바탕으로 산업과 개별 기업의 특성을 반영한 전략을 개발하고 추진할 수 있어야 할 것이다. 이에 본 연구에서는 금융, 제조, IT 분야별로 나누어 주요 국내 기업들의 ESG 보고서와 관련 뉴스 기사를 이용하여 산업별 ESG 동향과 활동을 비교 분석하였다. 키워드 빈도분석과 토픽 모델링을 활용한 분석 결과, 국내 ESG 선도 기업들의 지속가능경영 활동에서의 산업별 차이를 도출 할 수 있다. 금융 분야에서는 '고객 중심 경영'과 '기후 변화 대응', 제조 분야에서는 '지속가능한 공급망 관리'와 '탄소중립', IT 분야에서는 '기술혁신'과 '디지털 책임'이 강조되었다. ESG 요소별 우선 순위가 높은 활동의 예를 들면, 환경 측면에서는 '에너지 절감과 친환경 활동', 사회 측면에서는 '사회공헌과 상생', 지배구조 측면에서는 '이사회 독립성 강화와 리스크 관리' 등으로 나타났다. 더 나아가 산업별 각 ESG 요소의 핵심 이슈 뿐 아니라 ESG 보고서와 뉴스 기사의 내용 유사성 및 차별점도 확인하였다. 연구의 결과는 산업별 동향을 고려한 ESG 경영 전략 및 정책의 방향성을 제시하고 있으며 이는 산업별 ESG 평가체계 수립에도 도움이 될 것으로 기대한다.

• 한국식품과학회지
• /
• 제24권2호
• /
• pp.171-176
• /
• 1992

더덕(Codonopsis lanceolata)의 휘발성 향기성분을 분석하기 위해 gas co-distillation(GCD), solvent extraction/fractionation(SLF), headspace sampling(HSS) 방법을 사용하여 향기성분을 분리농축하고 분석 비교한 결과 SEF와 HSS 방법으로 얻은 농축물들의 향이 원래의 더덕향과 가장 유사했으며 gas chromatogram들의 양상도 비슷했으나 peak들의 크기에 있어서 차이를 보였다. SEF 농축물에서는 달콤한 향을 기리고 HSS 농축물에서는 풋내를 비교적 강하게 느낄 수 있었으나 GCD 농축물의 경우 일정 증류시간이 지나면 한악취를 느낄 수 있었다. SEF와 HSS 방법은 GCD에 비해서 적은 조작 단계로 손쉽게 빠른 시간내에 분리 농축이 가능했다. 농축한 향기성분은 GC-MS와 극성이 다른 두 column을 사용한 GC-RI system을 이용하여 확인하였다. 특히 GC-RI는 isomer의 확인에 효과적이었으며 극성 FFAP column은 극성 화합물의 확인에 보다 적합했다. 35가지의 향기성분들을 동정하였는데 그중 24개의 성분들은 simultaneous distillation extraction 농축물에서는$^{(5)}$ 확인되지 않았던 향기성분들이다. 화인된 성분들중 trans-2-hexenal, cis-3-hexen-1-ol, trans-2-hexen-1-ol, hexanol은 더덕의 풋내를, 1-octen-3-ol은 신선한 풍미를 그리고 amyl propionate를 비롯한 다수의 에스터 화합물 등은 더덕 특유의 달콤한 향에 복합적으로 작용할 것으로 추정된다.

• 농촌계획
• /
• 제29권3호
• /
• pp.25-37
• /
• 2023

According to the 「Rural Spatial Reconstruction and Regeneration Support Act」, enacted on March 29, 2024, all local governments are required to establish a 'Rural Spatial Reconstruction and Regeneration Plan' (hereinafter referred to as the 'Rural Spatial Plan'). In order for the 'Rural Spatial Plan' to be appropriately established, this study analyzed the supply and demand of spatial data from the perspective of user stakeholders and derived implications for improving rural spatial planning data utilization. In conclusion, three key recommendations come from this result. Firstly, it is necessary to establish an integrated DB for rural spatial planning data. This can solve the problem of low awareness of scattered data-providing websites, reduce the processing time of non-GIS data, and reduce the time required to acquire data by securing the availability of data search and download. In particular, research should be conducted on the establishment of a spatial analysis simulation system to support stakeholders' decision-making, considering that many stakeholders have difficulty in spatial analysis because spatial analysis techniques were not actively used in rural projects before the implementation of the rural agreement system in 2020. Secondly, research on how to improve data acquisition should be conducted in each data sector. The data sector group with the lowest ease of receiving are 'Local Community Domain', 'Changes in Domestic and International Conditions', and 'Provision and Utilization of Daily Life Services'. Lastly, in-depth research is needed on how to raise each rural spatial planning data supply stakeholder to the position of player. Stakeholders of 'University Institutions' and 'Public Enterprises and Research Institutes' should give those who participate in the formulation of rural spatial plans access to the raw data collected for public work. Stakeholders of 'Private company' need to come up with realistic measures to build a data pool centered on consultative bodies between existing private companies and then prepare a step-by-step strategy to fully open it by participating various stakeholders. In order to induce 'Village Residents and Associations' stakeholders to play a leading role as owners and producers of data, personnel should be trained to collect and record data related to the village. In addition, support measures should be prepared to continue these activities.

• 한국환경복원기술학회지
• /
• 제26권4호
• /
• pp.17-34
• /
• 2023

Camera trapping has been used as a non-invasive survey method that minimizes anthropogenic disturbance to ecosystems. Nevertheless, it is labor-intensive and time-consuming, requiring researchers to quantify species and populations. In this study, we aimed to improve the preprocessing of camera trapping data by utilizing an object detection algorithm. Wildlife monitoring using unmanned sensor cameras was conducted in a forested urban forest and a green space on a university campus in Cheonan City, Chungcheongnam-do, Korea. The collected camera trapping data were classified by a researcher to identify the occurrence of species. The data was then used to test the performance of the YOLO-X object detection algorithm for wildlife detection. The camera trapping resulted in 10,500 images of the urban forest and 51,974 images of green spaces on campus. Out of the total 62,474 images, 52,993 images (84.82%) were found to be false positives, while 9,481 images (15.18%) were found to contain wildlife. As a result of wildlife monitoring, 19 species of birds, 5 species of mammals, and 1 species of reptile were observed within the study area. In addition, there were statistically significant differences in the frequency of occurrence of the following species according to the type of urban greenery: Parus varius(t = -3.035, p < 0.01), Parus major(t = 2.112, p < 0.05), Passer montanus(t = 2.112, p < 0.05), Paradoxornis webbianus(t = 2.112, p < 0.05), Turdus hortulorum(t = -4.026, p < 0.001), and Sitta europaea(t = -2.189, p < 0.05). The detection performance of the YOLO-X model for wildlife occurrence was analyzed, and it successfully classified 94.2% of the camera trapping data. In particular, the number of true positive predictions was 7,809 images and the number of false negative predictions was 51,044 images. In this study, the object detection algorithm YOLO-X model was used to detect the presence of wildlife in the camera trapping data. In this study, the YOLO-X model was used with a filter activated to detect 10 specific animal taxa out of the 80 classes trained on the COCO dataset, without any additional training. In future studies, it is necessary to create and apply training data for key occurrence species to make the model suitable for wildlife monitoring.

• Journal of Advanced Marine Engineering and Technology
• /
• 제38권2호
• /
• pp.123-132
• /
• 2014

The maritime sector is advancing with dedicated endeavor to reduce greenhouse gas in addressing issues with regards to global warming. Since 01 January 2013, the International Maritime Organization (IMO) regulation mandatory requirement for Energy Efficiency Design Index (EEDI) has been in place and should be satisfied by newly-built ships of more than 400 gross tonnage and the Ship Energy Efficiency Management Plan (SEEMP) for all ships type. Therefore, compliance to this necessitates planning during the design stage whereas verification can be carried-out through an acceptable method during sea trial. The MEPC-approved 2013 guidance, ISO 15016 and ISO 19019 on EEDI serves the purpose for calculation and verification of attained EEDI value. Individual ships EEDI value should be lower than the required value set by these regulations. The key factors for EEDI verification are power and speed assessment and their synchronization. The shaft power can be measured by telemeter system using strain gage during sea trial. However, calibration of shaft power onboard condition is complicated. Hence, it relies only on proficient technology that operates within the permitted ISO allowance. On the other hand, the ship speed can be measured and calibrated by differential ground positioning system (DGPS). An actual test on a newly-built vessel was carried out to assess the correlation of power and speed. The Energy-efficiency Design Index or Operational Indicator Monitoring System (EDiMS) software developed by the Dynamics Laboratory-Mokpo Maritime University (DL-MMU) and Green Marine Equipment RIS Center (GMERC) of Mokpo Maritime University was utilized for this investigation. In addition, the software can continuously monitor air emission and is a useful tool for inventory and ship energy management plan. This paper introduces the synchronization and identification method between shaft power and ship speed for EEDI verification in accordance with the ISO guidance.

• 농촌계획
• /
• 제22권1호
• /
• pp.1-11
• /
• 2016

The analysis of research trends is used to identify key subject areas, research trends over time, and new discussions in a study field. The purpose of this study is to examine the characteristics of research articles published in the area of rural planning using bibliometric methods. Research articles published in the Journal of Korean Society of Rural Planning "Rural Planning" from 1995 to 2014 were analyzed to determine the annual publications, the number of periodical contributions, the authorship patterns, and popular research subjects and keywords. The results of this study are as follows; (1) The number of research papers and authors has increased over the 20 years periods (1995-2014); (2) The most published authors are associated with the study of rural planning. Seoul National University, Rural Development Administration, and Chonnam National University have highly contributed to the paper publications; (3) The most frequent word in titles is "Rural" for the whole period from 1995 to 2014. The most frequent words are "Village" and "Planning" from 1995-2006, and "Landscape" and "Village" in 2007-2010, and "Village" and "Area" from 2011-2014; and (4) The most used keywords are "Rural amenity", "Rural village", and "Rural landscape" for all of the different time frames.

• 한국환경복원기술학회지
• /
• 제6권2호
• /
• pp.27-38
• /
• 2003

This study aimed to provide basic data for future management of roadside trees by analyzing problems associated with plantation and management of roadside trees through categorization of functions and organizational structure, plantation and management, and management regulations and generating improvement opportunities based on the result of a survey on the awareness of government officials who are directly in charge of managing roadside trees in 31 cities & counties within Kyonggi province. The summary of key results of this study is as follows. First, "roadside tree-related function" is still not considered to be independent. About a half of government officials in charge did not majored in this field and they spent only about "2.09hours", in average, in the roadside tree-related function out of 8 working hours per day. Second, regarding problems and improvement opportunities in roadside tree-related function, lack of time was considered to be the biggest problem in overall management of roadside trees. As for improvement opportunities, "increase of dedicated manpower" and "system development" to facilitate efficient processing were suggested. Third, an annual budget for roadside tree-related affairs was merely 92 million won per city/county. A registry for management of roadside trees was kept manually. As for the roles of roadside trees, improvement of landscape and securing of green area itself were valued highly. Fourth, Ginkgo biloba, Zelkova serrata, and Prunus yedoensis were suggested to be the most appropriate species for roadside tree and Platanus occidentalis, Populus albaglandulosa, Populus euramericana, and Robinia pseudo-acacia were mentioned to be the least appropriate species.