• 한국정보전자통신기술학회논문지
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• 제13권5호
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• pp.389-396
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• 2020

본 논문에서는 스마트 농업을 구현하기 위한 재배이력관리 시스템을 개발하여 구현하였으며, 특히 스마트 팜에서 재배하기 힘든 곡물의 재배이력을 관리하는 시스템을 고안하였다. 스마트디바이스를 기반으로 하는 모바일 및 웹 프로그램을 설계하였고, 수집되는 정보는 DB 서버에 저장되어 빅 데이터로 활용이 가능하다. 또한 모바일 장치의 GPS를 적용한 GIS/LBS기반의 전자지도(Vworld map)를 이용하여 실시간 위치정보와 농업활동 정보의 매칭이 가능하다. 현장에서 필요로 하는 재배이력정보 DB를 설계하여 농가, 농민, 재배정보를 관리자가 활용하기 쉽게 개발하였고, 모바일 및 웹 프로그램을 개발하여 현장에서 구현해보았다. 본 시스템은 노동력절감효과와 기후변화와 같은 변수에 대응하여 품질과 안전관리의 능력을 한 단계 높일 것으로 기대된다.

• 한국구조물진단유지관리공학회 논문집
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• 제11권5호
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• pp.99-106
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• 2007

본 연구에서는 건설비용, 노무비 절감, 공기단축 등의 요구에 대응하기 위해, 일체형 및 분절형 PSC 거더의 구조적인 거동을 평가하는데 연구목적을 두었다. 본 논문에서는 동일한 단면을 갖는 총 3개의 실험체를 제작하였으며, 접합부와 긴장재의 양을 주요변수로 하여 모멘트-처짐 거동을 비교 분석하였다. 첫 번째 거더는 거더를 일체로 제작하여 세 개의 강연선을 배치하였고 두 번째 거더는 5개의 분절된 세그먼트로 제작하여 세 개의 강연선을 이용하여 각각의 세그먼트를 접합하였다. 그리고 세 번째 거더는 두 번째 거더와 같이 분절된 거더로써 추가 강연선을 배치하였다. 수행된 실험의 결과를 분석함으로써 일체형 거더와 분절형 거더의 거동 차이를 알 수 있었으며, 수행된 2차원 비선형유한요소해석은 실험결과와 비교하여 모멘트-처짐 곡선을 비교적 잘 예측하였다.

• 사회경제평론
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• 제31권2호
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• pp.105-126
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• 2018

본 논문은 마르크스 가치론의 이시적 단일체계 해석(TSSI)에 대한 두 가지 비판적 논점을 제시한다. 첫째, 일반적인 조건 하에서 마르크스주의 근본정리가 성립함을 보일 수 있는 것은 TSSI가 유일하다라는 TSSI 논자들의 주장과는 달리, 명목이윤 뿐만 아니라 실질이윤에 대한 두 개의 서로 다른 정의를 모두 고려할 경우, 마르크스주의 근본정리가 TSSI 내에서 성립하는지 여부는 결정되지 않는다. 둘째, 오키시오 정리 비판으로 제시된 클리만 (1996)의 수리모형에 대해, 오키시오 정리에서 중요한 요소인 기술변화의 비용절감 여부를 고려하지 않는다는 점이 기존 문헌에서 지적된 바 있는데, 본 논문에선 이를 수리적으로 확인하는 작업을 통해 클리만 모형의 기술변화는 비용절감적이지 않고 따라서 오키시오 정리에 대한 내재적 비판이라고 할 수 없다는 점을 보인다.

• Structural Engineering and Mechanics
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• 제55권6호
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• pp.1139-1155
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• 2015

In this study, a new retrofitting method for improving the seismic performance of reinforced concrete column was presented, in which prestressed steel strips were utilized as retrofitting stuff to confine the reinforced concrete column transversely. In order to figure out the seismic performance of concrete column specimen retrofitted by such prestressed steel strips methods, a series of quasi-static tests of five retrofitted specimens and two unconfined column specimen which acted as control specimens were conducted. Based on the test results, the seismic performance including the failure modes, hysteresis performance, ductility performance, energy dissipation and stiffness degradation of all these specimens were fully investigated and analyzed. And furthermore the influences of some key parameters such as the axial force ratios, shear span ratios and steel strips spacing on seismic performance of those retrofitted reinforced concrete column specimens were also studied. It was shown that the prestressed steel strips provided large transverse confining effect on reinforced concrete column specimens, which resulted in improving the shearing bearing capacity, ductility performance, deformation capacity and energy dissipation performance of retrofitted specimens effectively. In comparison to the specimen which was retrofitted by the carbon fiber reinforced plastics (CFRP) strips method, the seismic performance of the specimens retrofitted by the prestressed steel strips was a bit better, and with much less cost both in material and labor. From this research results, it can be concluded that this new retrofitting method is really useful and has significant advantages both in saving money and time over some other retrofitting methods.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2016년도 추계학술대회
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• pp.485-488
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• 2016

국내 온실용 복합환경제어 기술은 온도, 습도 및 $CO_2$ 등의 환경을 작물재배 기술 및 전문가의 자문을 통하여 환경을 설정하여 하드웨어를 기계적으로 조작하는 단계이다. 이러한 자동화는 노동력 절감 등의 단순효과는 있으나, 실질적인 생산량 증대 및 품질을 개선하기 위하여 식물의 생육, 생리상태를 실시간으로 추적하고 그에 맞게 실시간으로 최적 환경을 제어하는 소프트웨어 기반의 복합환경제어 기술이 필요하다. 따라서 본고는 이러한 복합환경제어기술의 방안제시의 일환으로 국내에서 수행중인 스마트팜 빅데이터 분석 체계와 인공신경망 기술동향을 분석하고, 이를 기반으로 인공신경망을 이용한 시설원예 생산량 예측 방안을 제시하고자 한다.

• 복식문화연구
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• 제27권5호
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• pp.415-432
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• 2019

The purpose of the present study was to generate a list of business ethics components according to business area for small and medium-sized fashion companies. Based on the literature review, 21 components of business ethics components were identified within five business areas. Ten CEOs(Chief Executive Officers) each participated in an in-depth interview, sharing ethical and unethical cases from their own businesses. Constant comparative analysis was used to generate important business ethics components from those cases. In results, important business ethics components for each business area are: 1) using human-friendly materials, strengthening sustainable technologies, using vegan materials, concerning safe process, and reducing waste in the material production and sourcing area, 2) enhancing an efficiency in design, developing recycle/reuse designs, avoiding to copy designs, and using messages for public interest in the product design area, 3) concerning fair-trade, reducing harmful substance, saving energy, and using ethical supply channels in the distribution and logistics area, 4) acquiring certifications, promoting consumer protection, avoiding exaggerative/false advertisements, and promoting social contributions in the management and marketing area, and 5) promoting workers' rights, complying with the law, and investing on employee educations in the labor management area. All of the ethical and unethical cases of the ten companies have involved aspects of the 21 components, thereby enhancing understandings on how each issue is being seriously considered and/or handled in the small and medium-sized fashion companies. Study findings may provide a basis for development of a research model for quantitative studies and/or educational programs related to business ethics in the fashion industry.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제16권12호
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• pp.4008-4023
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• 2022

Since machine learning was introduced into cross-site scripting (XSS) attack detection, many researchers have conducted related studies and achieved significant results, such as saving time and labor costs by not maintaining a rule database, which is required by traditional XSS attack detection methods. However, this topic came across some problems, such as poor generalization ability, significant false negative rate (FNR) and false positive rate (FPR). Moreover, the automatic clustering property of graph convolutional networks (GCN) has attracted the attention of researchers. In the field of natural language process (NLP), the results of graph embedding based on GCN are automatically clustered in space without any training, which means that text data can be classified just by the embedding process based on GCN. Previously, other methods required training with the help of labeled data after embedding to complete data classification. With the help of the GCN auto-clustering feature and labeled data, this research proposes an approach to detect XSS attacks (called GCNXSS) to mine the dependencies between the units that constitute an XSS payload. First, GCNXSS transforms a URL into a word homogeneous graph based on word co-occurrence relationships. Then, GCNXSS inputs the graph into the GCN model for graph embedding and gets the classification results. Experimental results show that GCNXSS achieved successful results with accuracy, precision, recall, F1-score, FNR, FPR, and predicted time scores of 99.97%, 99.75%, 99.97%, 99.86%, 0.03%, 0.03%, and 0.0461ms. Compared with existing methods, GCNXSS has a lower FNR and FPR with stronger generalization ability.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 1996년도 International Conference on Agricultural Machinery Engineering Proceedings
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• pp.1009-1020
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• 1996

Direct-seeded rice can have comparable yield with transplanted rice if its inherent problems can be solved. It is a labor-saving technology and can significantly reduce production cost because seedling nursery , pulling , and transplanting are omitted. Turnaround time between cropping is reduced hence the possibility of a third annual crop. But direct-seeded rice is very vulnerable to pest attack (by birds, rats, and golden snails), desiccation, weed infestation, and prone to lodging resulting to unstable crop establishment and inconsistent yield. These problems can be solved by anaerobic seeding (sowing pre-germinated seeds under the soil). It requires precise seed placement into the soil to optimize its benefits. We developed a four-row anaerobic direct seeder (US $ 200 commercial price) for this purpose . It consist of a structural framework mounted with a drum -hopper metering device, flotation type drivewheels, spring-loaded and adjustable furrow closers, and furrow open rs, and a plastic rainguard. It can sow in line pre-germinated seeds into the soil thus permitting the use of mechanical weeders for a chemical-free weed control. Its performance was comparable with the Japanese two-row anaerobic seeder (costing US$400) in terms of seed placement and crop establishment. It was tested with five cultivars. Seeding rate varied from 38 kg/ha to 80kg/ha. Crop establishment ranged from 64 to 99 percent while grain yield varied from 3.0 t/ha to 5.4t/ha. A six-row anaerobic seeder was also developed and adapted to a powertiller for increased capacity , field efficiency , and easier operation. The anaerobic seeder is useful to farmers shifting to direct seeding to reduce rice production cost and to researchers conducting agronomic studies in direct-seeded rice. Blueprint of the machine is available free of charge from IRRI.

• Structural Engineering and Mechanics
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• 제86권6호
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• pp.715-730
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• 2023

Broad studies have addressed the issue of structural element damage identification, however, rubber bearing, as a key component of load transmission between the superstructure and substructure, is essential to the operational safety of a bridge, which should be paid more attention to its health condition. However, regarding the limitations of the traditional bearing damage detection methods as well as few studies have been conducted on this topic, in this paper, inspired by the model updating-based structural damage identification, a two-stage bearing damage identification method has been proposed. In the first stage, we deduce a novel bearing damage localization indicator, called element relative MSE, to accurately determine the bearing damage location. In the second one, the prior knowledge of bearing damage localization is combined with sailfish optimization (SFO) to perform the bearing damage estimation. In order to validate the feasibility, a numerical example of a 5-span continuous beam is introduced, also the noise robustness has been investigated. Meanwhile, the effectiveness and engineering applicability are further verified based on an experimental simply supported beam and actual engineering of the I-40 Bridge. The obtained results are good, which indicate that the proposed method is not only suitable for simple structures but also can accurately locate the bearing damage site and identify its severity for complex structure. To summarize, the proposed method provides a good guideline for the issue of bridge bearing detection, which could be used to reduce the difficulty of the traditional bearing failure detection approach, further saving labor costs and economic expenses.

• 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.73-79
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• 2017

Rapidly expanding population in the Kingdom of Saudi Arabia has a massive impact to put pressure on the shortage of housing and existing infrastructure. With average population growth rate of 1,9% yearly, the population in Saudi Arabia is projected to increase from 31 million in 2015 to 37 million in 2025. According to the housing ministry, Saudi Arabia needs to provide 3.3 million units to meet the demand in 2025, which is about 300,000 unit a year. In the past 40 years, using the conventional construction method, the Saudi construction industry was only able to build about 150,000 units per year. To meet the demand gap for the housing shortage, a new approach and innovation in construction methods are needed. Industrialized construction as an approach in construction methods has been studied and implemented in some countries that experienced similar corncerns. Industrialized construction can be defined as the implementation of manufacturing methods to construction-related activities to improve quality, reduce cost and project duration. Compared to the conventional construction method, prefabrication as industrialized construction methods has reduced construction labor on-site by 9.5%, construction project duration by 20%, and construction waste by 56%. It improves the quality, durability and cost saving not only for construction project owners, but also construction contractors. This paper discusses the possibility of 'industrialization' of building system in the Kingdom of Saudi Arabia as a solution for the housing shortage. It is an initial part of a study aims to develop a framework to develop industrialized building system in the Kingdom of Saudi Arabia. The is paper based on extensive literature review and case studies.