• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2004.04a
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• pp.35-38
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• 2004

부틸알데히드로 오염된 대상 부지에 Biosparging 공법의 현장 적용을 위해 적정 공기 주입 압력 조건을 도출한 결과, 주 오염층인 자갈질 모래층에 공기주입 가능 파괴압력(Pe)는 약 300mmAq로 측정되었으며 4,500mmAq 압력 조건에서는 용존 산소농도의 영향 반경이 약 3 m로 나타났다. 위의 조건을 적용하여 약 150일간 운전한 결과, 영양물질을 투입하지 않은 초기 90일 동안 최고농도 대비 약 90%가 저감되었으며 그 이후에 영양물질을 투입하여 초기 최고 농도 대비 96%가 저감되어 복원목표치인 50ppm을 모든 지역에서 만족시켰다. 또한 생분해 반응속도가 k=0.03/day로 나타나 휘발성이 낮고 생분 해도가 뛰어난 부틸알데히드로 오염된 자갈질 모래층에 Biosparging공법이 성공적으로 적용된 사례이다.

• Survey Research
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• v.11 no.3
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• pp.115-137
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• 2010

This article challenges necessity for applications of ethnography principles to marketing research in the field. Since ethnography collects in-depth data about consumers' experiences and behavioral patterns, it can provide useful informations for marketers' decision making. Therefore this study introduces ethnography principles that need to be applied to marketing research, summarizes its usage values in the fields, and introduces case projects that were conducted under the guideline of ethnography principles. Finally, this study identifies the reasons why marketers hesitate using ethnography when they conduct marketing research and provides suggestions for more active applications of ethnography in the field.

• Proceedings of the Korean Society of Disaster Information Conference
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• 2022.10a
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• pp.307-308
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• 2022

본 논문에서는 현장에서 발생된 점토에 양질토사를 혼합하여 노상 및 노체에 대한 쌓기 재료로 사용하기 위한 기초 연구로서 사용적합성 여부를 실험하여 분석하였다. 본 연구와 같은 방법을 현장에 적용할 경우에 공사비 절감이 가능할 것으로 판단된다.

• Journal of the Korean GEO-environmental Society
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• v.20 no.2
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• pp.19-28
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• 2019

Grounds of the western coast of the Korean Peninsular are mostly composed of soft and cohesive soils, and it is necessary to carry out soil improvement before construction. The CGS (Compaction Grouting System) method has been commonly applied for the purpose of not only improving soft ground but also serving as the pile foundation of a bridge. In this paper, the CGS method was applied to the Incheon International Airport facility site, which consists of reclaimed landfill and soft clay soil, so as to evaluate the applicability of this soil improvement method to soft clay ground formations. Futhermore, results of construction were intensively studied along with a series of field experiments and theoretical consideration. The cone penetration tests were performed to assess the ground improvement effect of the CGS method. Consequently, the application of CGS method led to an increase in soil strength enough to be used as the pile foundation to support the bridge at the site. In addition, the size of the upper grout-bulb was estimated by adopting the cavity expansion theory and compared with that of actual grout bulb exhumed in the field. Therefore, it is proved that the cavity expansion theory can be utilized to predict and evaluate the improvement of soft ground.

• Journal of Korean Society of Environmental Engineers
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• v.38 no.7
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• pp.387-394
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• 2016

Commercial 28 algae removal technologies that have been applied in domestic rivers and lakes with green tide were investigated, analyzed and classified. The classification of algae removal technologies was based on the three criteria (i.e., principle, flow rate of water body, and application period). Also, algae removal technologies were evaluated in terms of cost effectiveness, field applicability, effect durability, and eco friendliness. From the analysis results, technologies using physical, chemical, biological, and convergent controls were 32.2%, 25%, 21.4%, and 21.4%, respectively. The 75% of technologies have been applied to stagnant water body (${\leq}0.2m/s$). Also, algae harvesting ship with dissolved air flotation, conveyor belt and filtration processes and natural floating coagulant were found to have better field applicability, compared to other technologies. However, proper algae removal technology in specific rivers and lakes should be chosen after the evaluation of long-term pilot scale field test. Also, development of energy and resource recovery technologies from algae biomass is warranted.

• Journal of the Korea Institute of Building Construction
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• v.21 no.1
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• pp.79-86
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• 2021

On the construction site, there exists frequently a high likelihood that a fire accident can lead to a large-scale disaster. In the previous studies, the diverse outcomes have been focused on the improvement of relative statutes and tried to realize the suppression and confrontation of the fire accidents. In this study, the limitations on the site were identified through prior research reviews, and the fire risk assessment checklist was proposed through the analysis of the massive accident cases. The checklist was divided into the prevention and minimization steps and developed into 16 categories of total risk factors. According to the results from the cases applied in this study, if the installation status is checked, such as removing combustibles, and broadcasting facilities for evacuation are installed, it is expected that the casualties will be minimized or zeroed. By developing a fire risk assessment checklist, this study provides the implications of the theoretical and realistic fire accident prevention, and supports the ways to minimize the damage resulted from the fire accidents on construction sites. In the further, deriving universe and common items about repeated occurrences of a work type will be needed as a subsequent research.

• Journal of the Korean GEO-environmental Society
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• v.13 no.8
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• pp.5-13
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• 2012

This research have investigated the application and the injection effect of the alkaline silicasol grouting materia (which is) recently developed. To compare the engineering characteristics of the alkaline silicasol which is formed with 3D-gel and the sodium silicate, it have studied the strength and environmental effects through the laboratory test, and field application was investigated with a review of the injection effect and waterproof through the field test. As a result of the laboratory test, unconfined compression strength of alkaline silicasol was 5 times more than sodium silicate. As a result of the leaching test, a total amount of the eluviated elements was very small, it considered the environment-friendly material. As a result of the field test, considerable reduction of the coefficient of permeability at the hydraulic layer was confirmed, and it could secure that the coefficient of permeability showed a lower than standard value of $10^{-5}cm/sec$.

• Journal of The Korean Association of Information Education
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• v.21 no.3
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• pp.267-275
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• 2017

The purpose of this study is to analyze the teachers' perceptions about the various evaluation methods used in SW education and to find ways to improve the usefulness of the field. To do this, we surveyed the teachers who were educated about SW education evaluation. As a result of the study, it was recognized that the use of output, portfolio, and observation evaluation in SW education class is suitable for evaluating Computational Thinking(CT) and useful for field application. On the other hand, paper and self-evaluation are useful for field application, but they are relatively inadequate to evaluate CT. Portfolio, design, and interview evaluations are good for measuring CT, but they are difficult to apply to the field. Also, evaluation criteria, evaluation factors, and strategies were found to be difficult to apply. Therefore, we suggest the necessary measures to apply SW education evaluation method more effectively.

• 전기의세계
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• v.42 no.4
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• pp.19-28
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• 1993

본고에서 언급한 내용은 대부분이 우리나라의 케이블 관련 연구 및 운용현장에서는 전혀 적용하지 않고 있는 기술로서 다른 분야의 활발한 연구사황과는 달리 국내의 전력케이블 분야에 대한 컴퓨터 적용기술은 매우 낙후되어 있다고 할 수 밖에 없다. 이는 케이블의 제조 및 포설과 이에 관련된 여러가지 시험에도 연구해야 할 분야가 많고 각종 Data도 부족하여 컴퓨터 적용까지는 많은 거리감이 있을지도 모르지만 또한 고전압분야의 각종 관련시험만으로 족하다는 연구 안주경향도 문제라고 할 수 있다. 이제 국내에서도 전력케이블 연구회도 조직되어 본격적인 연구의 협력체제에 들어갔고 이 분야의 연구인력과 사용자 등 관련자도 증가하고 있으므로 하루가 다르게 발달하고 여러가지 효용성을 제공하고 있는 컴퓨터를 이용한 관련기술을 전력케이블에 적용하여 실제 현장에서의 전력케이블 운전에 크게 기여하게 될 것을 기대한다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2021.07a
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• pp.407-408
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• 2021

본 연구의 목적은 Havruta 학습법 적용을 통해 학습자들 스스로 수업방식을 채택해보고 가지고 있는 지식의 공유를 통해 현장실무 교과과정에 적용하고 개선 방안을 모색하고자 하였다. 연구내용으로 첫째, 논쟁 중심 유형에서는 기술적 가치의 종류를 이해하고 그 중 어떠한 가치가 현장실무에 가장 부합하다고 생각하는지에 관한 논쟁, 둘째, 짝가르치기 유형으로 '아젠다 구축모형'중 '외부주도모형'에 대해 짝에게 가르칠 내용을 사전학습을 통해 학습의 효과를 높임과 동시에 다른 학습에서도 적용, 셋째, 질문중심 유형으로 현장실무 체계에 대한 질문중심수업을 적용하여 학습의 심화도를 높이고 질문에 익숙할 수 있도록 가이드와 유형별 질문 및 목표 제시, 넷째, 문제만들기 유형으로 활용 가능한 문제 예시자료를 통해 수업의 효과성을 학습자 스스로 체감하면서 다른 수업에서도 자발적으로 적용해 볼 수 있도록 하였다.