• Journal of the Korean Recycled Construction Resources Institute
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• v.3 no.1
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• pp.72-83
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• 2015

Underground transmission lines always generate heat and transmit heat through surrounding backfill materials. Therefore, in the design of power lines it becomes a very crucial factor to transfer heat effectively into the neighbouring soils. In this study, in order to enhance field applicability of recycled aggregates for backfill material of transmission lines, quality criteria and construction criteria were proposed, and thermal stability of power lines through field demonstration tests were analyzed. In the field tests, two types of recycled aggregates and sand which is currently used for backfilling were compared in terms of thermal behaviour. Test results showed that recycled aggregates represented similar trends with sand in temperature and moisture content corresponding to time lapse and distance from the heat source. Consequently, recycled aggregates can be utilized for backfill materials of underground transmission lines as a substitute material of sands.

• Proceedings of the Korea Water Resources Association Conference
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• 2019.05a
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• pp.8-8
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• 2019

전 세계적으로 ASR, ASTR과 같은 인공함양에 대한 연구가 활발히 진행되고 있다. 본 연구에서는 수자원을 확보하고 생산수의 수질 개선을 꾀할 수 있는 지하 저수지 기술을 개발하고 낙동강 하구의 염 대수층에 설치한 시험시설에서 검증하였다. 국내외 대 하천의 하구에는 상부에는 점토층이 발달해 있고 하부에는 대수층이 대규모로 발달해 있으나 염 지하수로 포화되어 있는 경우가 많다. 점토층은 오염된 지표수나 지표면에서 발생한 오염사고로부터 하부의 피압 대수층을 분리하는 역할을 할 수 있다. 따라서 피압 대수층은 기존의 지표수 수자원 또는 대체 수자원의 한계를 극복할 수 있는 좋은 수자원 확보 공간이 될 수 있다. 지하 저수지 실증 연구를 위하여 낙동강 하구의 피압 대수층에 주입정, 양수정과 관측정 등을 포함한 시험 시설을 설치하였다. 낙동강에서 취수한 지표수의 부유물을 제거하고 대수층에 주입하여 기존의 염 지하수를 밀어내고 렌즈 형태의 담수체 (지하 저수지)를 조성하였다. 양수정과 관측정을 통하여 조사된 지하 저수지는 원 지하수가 배제되었고, 하천수보다 수질이 개선되었음을 보였다. 본 고에서는 실증 연구에서 도출된 수자원 확보 및 수질 개선 성과를 제시하고자 한다. 지하 저수지는 공사 규모가 작고, 수몰지가 발생하지 않으며, 수요지 인근에 위치해 있어 지역 내 수자원 자급이 가능하고, 토지 이용도 자유롭다. 또한 평상 시에 연중 균일한 양질의 수자원 공급이 가능하고 가뭄, 지표수 오염 등 비상 시에도 장기간 안정적으로 청정 수자원 공급이 가능하다. 지하 저수지는 물 안보도 제고를 위한 취수원 다변화 차원에서 기여할 수 있을 것으로 판단된다.

• Journal of the Korean Institute of Gas
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• v.25 no.6
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• pp.45-52
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• 2021

The government is converting the fuel for trucks, one of the causes of PM in Korea, form diesel to LNG. Mobile LNG station are being developed to solve the problems of insufficient charging infrastructure and facilitate the spread of LNG fuel. In this study, QRA was used th calculate the CA of the facility for a secure design prior to the development of the mobile LNG station and to predict the individual/societal risk the scenario. As a result, the danger of mobile LNG station was in ALARP.

• The Journal of the Korea Contents Association
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• v.22 no.6
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• pp.692-700
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• 2022

This study was conducted to analyze firms' death rate and impact factors on the death of Foreign-invested Companies in Korea which is between 20013 and 2017. Cox Proportional Hazard Model took to conduct on the death impact factors, such as 2 characteristics factors of the firm, and 4 financial characteristics variables, variables, and 4 profitability factors. As a result of the impact factors of Foreign-invested Companies' death the Labour(NE) variables of characteristics firm had negative effects. And the Debt(LB), Operating Profit (OP), and Sales Profit (SP) of the financial characteristics had a negative effect. Other factors did not produce significant results. As a result of an empirically comparative analysis of the mortality rate of foreign-invested companies by the Kaplan-Meier method, it was analyzed that fully owned companies and large enterprises had lower extinction risk and greater sustainable management potential than joint ventures or SMEs.

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.4 no.3
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• pp.255-263
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• 2006

Vol-oxidizer is a device to convert $UO_2$ pellets into $U_3O_8$ powder and to feed a homogeneous powder into a Metal Conversion Reactor in the ACP(Advanced Spent Fuel Conditioning Process). In this paper, we propose a design model of the vol-oxidizer, develop the new vol-oxidizer with a capacity of 20 kg HM/batch in $UO_2$ pellets, and conduct a verification for the device. Design considerations include the internal structure, the capacity, the heating position of the device, and the size. The dimensions of the new vol-oxidizer are decided by the design model. We determine a permeability test of the $U_3O_8$ measuring the temperature distribution, and the volume of $UO_2$ and $U_3O_8$. We manufactured the new vol-oxidizer for a 20 kg HM/batch in $UO_2$ pellets, and then analyzed the characteristics of the $U_3O_8$ powder for the verification. The experimental results show that the permeability of the $U_3O_8$ throughout mesh enhance more than old vol-oxidizer, the oxidation time takes only 8 hours when compared with the 13 hours of the old device, and the average distribution of particle size is $40{\mu}m$. The capacities of new vol-oxidizer for a 20 kg HM/batch in $UO_2$ pellets were agree well with the predictions of design model.

• Journal of the Korean Society of Marine Environment & Safety
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• v.29 no.5
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• pp.497-504
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• 2023

In this study, Selective catalytic reduction (SCR) + Diesel particulate filter (DPF) system was installed on a ship with a low-speed engine to conduct the on-board test. The target ship (2,881 gross tons, rated power 1,470 kW@240 rpm ×1) is a general cargo ship sailing in the coastal area. Drawing development, approvals and temporary survey of the ship were performed for the installation of the after-treatment system. For performance evaluation, the gaseous emission analyzer was used according to the NOx technical code and ISO-8178 method of measurement. The particulate matter analyzer used a smoke meter to measure black carbon, as discussed by the International Maritime Organization (IMO). Tests were conducted using MGO (0.043%) and LSFO (0.42%) fuels according to the sulfur content. The test conditions were selected by considering the engine rpm (130, 160 and 180). Gaseous emission and particulate matter (smoke) were measured according to the test conditions to confirm the reduction efficiency of the after treatment system. The results of NOx emission and particulate matter (smoke) revealed that reduction efficiency was more than 90%. The exhaust pressure met the allowable back pressure (less than 50 mbar). This study confirms the importance of the on-board test and the potential of SCR + DPF systems as a response technology for reducing nitrogen oxides and particulate matter.

• Journal of Venture Innovation
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• v.5 no.4
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• pp.75-90
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• 2022

This study was conducted to empirically analyze the relationship between business and digital capabilities of small businesses on business satisfaction. To this end, business capabilities were subdivided into industry expertise and customer management expertise. Digital capabilities were subdivided into SNS activity, ease of ICT usability, and business utilization of ICT. At the same time, we examined how the moderating effect of performance of personal media education. A survey was conducted to empirically analyze this, and 200 sample who received personal media education were analyzed. SPSS 24.0 and Macro Process 4.0 were used for statistical analysis. As a result of the empirical analysis of this study, industry expertise, customer management expertise, SNS activity, and business utilization of ICT, all had a positive (+) significant effect on business satisfaction. On the other hand, the significant influence relationship on the ease of ICT usability was not tested. Industry expertise and business utilization of ICT were found to be variables that had a great influence. It was analyzed that personal media education performance plays a moderating role between SNS activity, business utilization of ICT and business satisfaction. The results of this study are meaningful in that they empirically analyze that these capabilities affect business satisfaction even for small businesses at a time when the importance of digital capabilities increases.

• Information Systems Review
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• v.20 no.1
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• pp.41-59
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• 2018

This study analyzed the factors that affect acceptance of online direct marketing in agricultural companies. Empirical analysis was conducted using the research model based on the individual's technology acceptance model (TAM) and the information technology adoption models in organizations. These models have four dimensions: 1) technology characteristics, which include perceived usefulness and perceived ease of use of TAM 2) CEO characteristics, which including the innovativeness and IT capability of CEOs; 3) organizational readiness, which include financial, technological, and human resources capabilities and 4) environment and external pressure, which include government support and changes to the Internet environment. These concepts were empirically tested. A total of 209 valid data were collected through questionnaires and analyzed using confirmatory factor analysis and path analysis through the application of structural equation modeling. Results show that perceived usefulness, IT capability of CEOs, and changes to the Internet environment have significant effects on the adoption intention of online direct marketing. However, perceived ease of use, CEO innovativeness, government support, and the variables of organizational readiness dimension did not have significant effects on adoption intention. This study suggests practical implications for adoption of online direct marketing in agricultural companies.

• The Journal of the Korea Contents Association
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• v.19 no.8
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• pp.667-676
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• 2019

In recent years, the occurrence of life and violent crime in the city centered on crime-prone areas has become a big issue, raising the public interest in safety from crime has been higher than ever. As the initial response to crime and the importance of crime prevention are emerging, the government is preparing various measures such as crime prevention service using advanced technology. This project is a demonstration project to select specific target sites and apply that on a trial basis with the main purpose of commercialization of intelligent crime prevention technologies and services. In order to spread the business through the demonstration project, it is expected that the practical economic evaluation as well as the academic and practical value of the project will have a great significance. In this study, the purpose of this research is to derive economic feasibility through technologies and services to be implemented in Indokwon district of Anyang city, which is selected demonstration site of the intelligent security, to promote the spread of business and contribute to the policy activation.

• Journal of Information Technology Application
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• v.1
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• pp.129-149
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• 1999

본 논문은 국내 소프트웨어 산업에 있어서 기업의 시장 활동과 관련된 특성을 분석하고 정부의 정책 및 역할을 분석하였다. Porter의 국가 경쟁력 모형을 기본 프레임워크로 하여 국내의 소프트웨어 산업에 있어서의 수요조건의 특성과 이에 관련된 관련 정책 방향을 점검하였다. 실증적 자료가 부족한 국내의 소프트웨어 산업을 대상으로 탐색적 성격의 시장 활동 분석용 설문을 작성하여 약 200개의 소프트웨어 사업자를 대상으로 설문을 수행하여 이들 사업자들이 느끼는 시장 활동의 특성을 분석하였으며, 이를 바탕으로 정부의 역할에 대한 정책적 시사점을 도출하고자 하였다.