• 한국구조물진단유지관리공학회 논문집
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• 제22권3호
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• pp.53-59
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• 2018

본 논문에서는 재활용 필름을 사용한 친환경 그리드형 보강재와 사전에 충진재의 혼입을 통해 분산성을 향상시킨 섬유를 도로 포장층에 복합적으로 적용한 공법의 현장 적용성을 분석하였다. 그리드형 보강재를 구성하고 있는 필름은 폐기된 PE수지를 재활용하여 친환경성을 강조하였고, 아스콘 혼입 섬유는 아스콘 충진재의 사전 혼입을 통한 섬유의 분산성을 확보한 것이다. 복합 섬유를 혼입한 교량 포장층을 시공함에 있어 발생할 수 있는 제반 상황을 사전에 인지할 수 있도록, Mock Up 포장층에 대한 기본적인 성능 분석을 실시하였다. 분석 결과, 친환경 그리드 보강재와 분산성 섬유를 함유한 포장층에서 강도 및 응력, 처짐 저항성에서 모두 기능성이 향상된 것을 확인할 수 있었다. 그러므로, 섬유 실제 현장 적용시 친환경성 재료 도입과 더불어 안전성 측면에도 효율적인 공법이라고 판단된다.

• 한국지하수토양환경학회지:지하수토양환경
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• 제20권2호
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• pp.10-21
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• 2015

The present study introduces a novel numerical approach for solving dispersion dominated problems with Cauchy boundary condition in an Eulerian-Lagrangian scheme. The study reveals the incapability of traditional Neuman approach to address the dispersion dominated problems with Cauchy boundary condition, even though it can produce reliable solution in the advection dominated regime. Also, the proposed numerical approach is applied to a real field problem of radioactive contaminant migration from radioactive waste repository which is a major current waste management issue. The performance of the proposed numerical approach is evaluated by comparing the results with numerical solutions of traditional FDM (Finite Difference Method), Neuman approach, and the analytical solution. The results show that the proposed numerical approach yields better and reliable solution for dispersion dominated regime, specifically for Peclet Numbers of less than 0.1. The proposed numerical approach is validated by applying to a real field problem of radioactive contaminant migration from radioactive waste repository of varying Peclet Number from 0.003 to 34.5. The numerical results of Neuman approach overestimates the concentration value with an order of 100 than the proposed approach during the assessment of radioactive contaminant transport from nuclear waste repository. The overestimation of concentration value could be due to the assumption that dispersion is negligible. Also our application problem confirms the existence of real field situation with advection dominated condition and dispersion dominated condition simultaneously as well as the significance or advantage of the proposed approach in the real field problem.

• 한국기후변화학회지
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• 제9권1호
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• pp.59-67
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• 2018

In this study, the $N_2O$, emitted from combustion facility, were analyzed by using simulated gas and field samples to find out how long samples can be stored in Tedlar bag. According to the results of the experiment using simulated gases (1 ppm, 5 ppm, 10 ppm) in Tedlar bag, After 144hr, $N_2O$ concentration of simulated gases changed that 1 ppm is 5.3%, 5 ppm is 12.8%, and 10ppm is 10.5%. The higher initial concentration of simulated gas was, the larger rate of $N_2O$ concentration was changed. In case of high concentration samples, it need to be careful when it was analyzed after 144 hr. Stability evaluation in Tedlar bag was carried out through field samples such as combustion facility of bituminous coal, B-C oil and LNG. The concentration rate of field samples, which is under 1 ppm of average initial concentration, was evaluated using statistical method. As a result, $N_2O$ concentrations were changed to field samples in the bag even when 96 hr had passed. And after sampling, it is necessary that sample analysis should be quickly as soon as possible.

• 한국도시환경학회지
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• 제18권4호
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• pp.465-471
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• 2018

본 연구에서는 축산계 현장정밀조사를 통해 정부공식 자료로 사용되고 있는 전국오염원조사 결과의 정확성을 확인하고 이에 기초하여 합리적인 가축분뇨관리방안을 제시하였다. 양쪽의 조사결과는 가축사육시설수에서 17.7%, 젓소사육두수에서 39.6%, 돼지분뇨 처리방법에서 41.6%로 가장 큰 차이를 나타냈다. 가축분뇨처리에서 가장 문제가 되고 있는 돼지의 경우가 가장 큰 차이를 보이는 주요 이유는 농경지 단위면적당 퇴비 사용량에 대한 법적 기준이 없어 개별처리 대상 농경지(과수원 포함)의 상당수가 위탁처리비의 절감을 위해 가축분뇨 매립장의 역할을 하고 있기 때문인 것으로 추정할 수 있다. 한편 하천인근의 농경지에 야적되어 있는 방치축분의 67%가 비가림 시설이 없어 비가 올 경우에 방치축분 더미가 그대로 하천으로 흘러 들어갈 수 있었다.

• 인간식물환경학회지
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• 제24권4호
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• pp.441-450
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• 2021

Background and objective: The purpose of study is to analyze the three-dimensional (3D) structure by creating a 3D model for green spaces in a park using unmanned aerial vehicle (UAV) images. Methods: After producing a digital surface model (DSM) and a digital terrain model (DTM) using UAV images taken in Mureung Park in Chuncheon-si, we generated a digital tree height model (DHM). In addition, we used the mean shift algorithm to test the classification accuracy, and obtain accurate tree height and volume measures through field survey. Results: Most of the tree species planted in Mureung Park were Pinus koraiensis, followed by Pinus densiflora, and Zelkova serrata, and most of the shrubs planted were Rhododendron yedoense, followed by Buxus microphylla, and Spiraea prunifolia. The average height of trees measured at the site was 7.8 m, and the average height estimated by the model was 7.5 m, showing a difference of about 0.3 m. As a result of the t-test, there was no significant difference between height values of the field survey data and the model. The estimated green coverage and volume of the study site using the UAV were 5,019 m² and 14,897 m³, respectively, and the green coverage and volume measured through the field survey were 6,339 m² and 17,167 m³. It was analyzed that the green coverage showed a difference of about 21% and the volume showed a difference of about 13%. Conclusion: The UAV equipped with RTK (Real-Time Kinematic) and GNSS (Global Navigation Satellite System) modules used in this study could collect information on tree height, green coverage, and volume with relatively high accuracy within a short period of time. This could serve as an alternative to overcome the limitations of time and cost in previous field surveys using remote sensing techniques.

• 시스템엔지니어링학술지
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• 제20권1호
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• pp.1-15
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• 2024

This study attempted to analyze whether the government's regulatory innovation efforts affect the continued operation of new products and new service-based businesses, such as regulatory compliance and response efforts, despite the perception of regulatory difficulties as business barriers for firms in new industries. Previous studies on the impact of regulations on companies in new industries were a limit to obtaining implications for regulatory issues and characteristics of each field due to the simplification of regulatory indicators and the establishment of field integration. To compensate for this, this study focused on the field of AI and DATA services, and subdivided regulatory issues to indicate practical inconvenience as variables, and model fit and hypothesis verification were performed by applying Structural Equation Model analysis based on the survey results of related companies. As a result, in the field of AI and DATA services, "Perceived regulatory irrationality" and "Perceived government regulatory innovation efforts" significantly affect the "Regulatory environment satisfaction" of the regulated, and "Perceived regulatory irrationality" and "Regulatory environment satisfaction" affect "Regulatory response efforts for companies in new industries to continue their businesses." The significance of this study is that it conducted research on the factors affecting the continuity of business of companies in the AI and DATA service sector by linking the analysis of the impact relationship between satisfaction and continuous use intention, which have been mainly used in the "Policy Acceptance Model" and "IT service sector," to "efforts for companies to continue their business in a new industrial regulatory environment." In addition, by presenting a new empirical model for new industry regulations, it is expected to be meaningful as it can provide a research foundation that can obtain practical implications in related fields.

• 한국실내디자인학회논문집
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• 제27호
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• pp.168-175
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• 2001

This study focuses to enhance the general understanding on the new approach and to provide a clue for a new paradigm in man-made physical and residential environment of the 21st Century. Through case analysis, this study aims to examine the characteristics of digital culture itself and of its physical and residential environment and to ultimately forecast the changeability of physical and residential environment prompted by the new digital wave. Without having precedent study about digital culture related to environmental issues, this study aimed to analyze the effect of digital culture in the field of physical environment and residential environment, and to forecast the changability in those fields. On the other hand, this study also atoned to be applicable in construction of a new paradigm in designing physical & residential environment in the near future, so as to contribute to the development of a new environment which will eventually improve the quality of human life.

• 한국조경학회지
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• 제34권1호
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• pp.37-47
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• 2006

Environment-friendly agriculture has not only the simple purpose producing foods but also the key roles of conserving rural environments, landscapes and sustainable land uses. In addition, environment-friendly agricultural areas and their landscapes are important factors representing uniqueness of rural areas. For these reasons, this study investigates the landscapes formed through environment-friendly agriculture and evaluates the economic values of the landscapes using CRM(contingent ranking method) which has been known as one of the practical methods in the field of environmental economics. Based upon a scenario that government introduces the ratio of environment-friendly agriculture to evaluate economic values, a survey was performed with 1,088 of rural residents throughout the country. The results of this study indicate that the economic value for conservation and maintenance of environment-friendly agriculture landscapes is 480 won per household/month/1% environment-friendly agriculture, and this can be converted into 829 hundred million won per 1% environment-friendly agriculture nationally.

• 자동차안전학회지
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• 제15권1호
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• pp.16-26
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• 2023

Recently, the importance of simulation in a virtual driving environment as well as real road-based tests for autonomous vehicle testing is increasing. Real road tests are being actively conducted at K-City, an autonomous driving test bed located at the Korea Automobile Safety Test & Research Institute of the Transportation Safety Authority. In addition, the need to advance the K-City virtual driving environment and build a virtual environment similar to the autonomous driving system test environment in real road tests is increasing. In this study, for K-City of Korea Automobile Safety Test & Research Institute, using detailed drawings and actual field data, K-City virtual driving environment was advanced, and similarity verification was verified through comparative analysis with actual K-City.

• 한국건설순환자원학회지
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• 제9권4호
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• pp.42-47
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• 2014