• Proceedings of the Korea Information Processing Society Conference
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• 2020.11a
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• pp.960-963
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• 2020

소비자원 소비자 위해 정보 동향 분석 보고서에 따르면, 10대 미만과 60대 이상이 겪는 사고 중 가정 내 사고의 비율이 약 70%로 높은 비율을 차지하는 것을 볼 수 있다. 기존의 CCTV는 실시간으로 영상 전송은 가능하지만 영상 속의 상황 분석은 하지 못하며, 이를 위해선 지켜보는 인력이 추가로 필요하다. 따라서 보호자의 비용 부담 없이 24시간 행동 분석을 통해 보호가 필요한 가족 구성원의 사고를 예방할 수 있으며 침입과 같은 범죄를 막을 수 있는 AI CCTV의 필요성을 느껴 제작하였다. 해당 CCTV는 실시간 분석으로 영상 내의 위험을 감지하고 감지 후 관련 사항을 등록된 연락처로 송출해서 보호자에게 위험 상황을 알릴 수 있다. 향후 가정 내의 IOT 기기들과 연결하여 위험 상황 발생 시 직접 위험 상황을 해결할 수 있는 스마트 홈 보안으로 범위를 넓힐 수 있다.

• Journal of the Earthquake Engineering Society of Korea
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• v.10 no.6 s.52
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• pp.47-56
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• 2006

A method is presented for evaluating the economic efficiency of a semi-active magneto-rheological (MR) damper system for cable-stayed bridges under earthquake loadings. An optimal MR damper capacity maximizing the cost-effectiveness is estimated for various seismic characteristics of ground motion. The economic efficiency of MR damper system is addressed by introducing the life-cycle cost concept. To evaluate the expected damage cost, the probability of failure is estimated. The cost-effectiveness index is defined as the ratio of the sums of the expected damage costs and each device cost between a bridge structure with the MR damper system and a bridge structure with elastic bearings. In the evaluation of cost-effectiveness, the scale of damage cost is adopted as parametric variables. The results of the evaluation show that the MR damper system can be a cost-effective design alternative. The optical capacity of MR damper is increased as the seismic hazard becomes severe.

• Journal of Korean Tunnelling and Underground Space Association
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• v.10 no.1
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• pp.1-15
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• 2008

Recently, because of the various factors by uncertainty of underground, the risks in tunnelling have been occurred increasingly. Therefore, it is very important to estimate and control the risks considering geotechnical conditions for tunnel stability and environmental problems by tunnel construction. In this study, the risk analysis for tunnel stability was carried out by classifying the risk factors such as ground support capacity, ground settlement, the inflow of groundwater into the tunnel and the damage by the earthquake. Also, the risk assessment for the environmental problems was performed by calculating the vibration and noise by blasting and the drawdown of the groundwater level caused by tunnel construction. Each risk factor was evaluated quantitatively based on the probabilistic and statistic technique, then it was analyzed the distribution characteristic along overall tunnel site. Finally, it was evaluated that how much each risk factor influences on the construction cost with a period for tunnel construction, so it is possible to perform reasonable tunnel design which was capable of minimizing the risks in the tunnel construction.

• Defense and Technology
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• no.2 s.276
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• pp.10-21
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• 2002

세계적으로도 국방예산은 감소추세에 있는 반면, 무기체계는 첨단화, 고도화됨에 따라 획득비용은 고가화 되고, 무기체계 주요수출국가 측면에서도 세계적으로 무기수요가 감소되고 무기체계 개발기술은 세계화되어 가고 있는 상황이므로 각국은 새로운 무기체계의 획득시 양국간 또는 다국간 협력을 적극적으로 추구하고 있다. 국제무기협력(intemational armaments collaboration) 참가국들은 이를 통하여 경제적으로는 획득사업에 대한 비용과 위험을 분담할 수 있으며, 군사적으로는 군사동맹국 및 우방국간에 무기체계의 표준화와 상호운용성을 제고시킬 수 있고, 또한 정치적으로는 협력국가간에 결속력을 강화시킬 수 있다는 기대감 때문이다.

• Proceedings of the Korean Institute of Industrial Safety Conference
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• 1998.05a
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• pp.199-205
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• 1998

최근 우리나라는 건설업의 산업재해자수가 '91년 이후 지속적인 감소 추세이지만 선진국에 비해서 아직 높은 편이다. '96년 건설업의 평균 재해율은 0.81％이며, 사망자수는 전 산업에서 29.5%에 이르는 것으로 나타났다. 이와 같이 심각한 건설업의 산업재해는 공사 자체의 위험성이 높은 특수성도 있지만, 가설공사에 대한 인식 부족으로 인한 낮은 투자가 원인이라고 볼 수 있다. 건설현장의 재해를 줄이고 시공의 안전성을 확보하기 위해서는 가설공사의 적정한 투자비용을 근원적으로 확보하여야 할 것으로 생각된다. (중략)

• Journal of Internet Computing and Services
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• v.16 no.4
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• pp.131-139
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• 2015

With the request for the advent of new engine toward economic growth, the issue regarding public-owned data disclosure has been increasing. The Korean governments are forced to open public-owned data and to utilize them in solving the various social problems and in promoting the welfare for the people. In contrast, due to the distrust of the effectiveness for the policy, many public owned organizations hesitate to open the public-owned data. However, in spite of communication gap between the government and public organizations, Ministry of Government Administration and National Information Society Agency recently planned to accelerate the information disclosure. The study aims to analyze the perception of the public organization for public data utilization and to provide proper recommendations. This research identified mutual weights that the organization recognize in opening and sharing the public data, based on benefit, opportunity, cost, and risk. ANP decision making tool and BOCR model were applied to the analyses. The results show that there are significant differences in perceiving risk and opportunity elements between the government and public organizations. Finally, the study proposed the ideal alternatives based on four elements. The study will hopefully provide the guideline to the public organizations, and assist the related authorities with the information disclosure policy in coming up with the relevant regulations.

• Journal of Digital Convergence
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• v.11 no.12
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• pp.29-40
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• 2013

This study analyzed that adjustment roles of the organization and Information System strategy suitability factors between influence and introduction outcome factors in the IT outsourcing in government offices. Influence factors of IT outsourcing are organization factor(information system maturity, CEO's support), trade factor(asset speciality, uncertainty, using degree of information system), risk factor(risk of security, risk of increase in cost, risk of losing autonomy). And outcome factors are set as economic effect and technology effect. We analyzed that organization and IS strategy suitability factors as moderator variables. Results are the followings. It was analyzed that organization and IS strategy suitability factors are in charge of adjusting role among information system maturity which is lower variable of organization factor, CEO's support, uncertainty of trade factor's lower variable, risk of security which is risk factor's lower variable, risk of increase in cost, loss of autonomy. Therefore, in order for organization to increase the outcome of information technology, organization strategy and IS strategy should be promoted in combined manner. However, it was analyzed that strategy suitability could not take the adjusting role between asset specialty and introduction outcome.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.11a
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• pp.311-312
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• 2009

$A^*$ 알고리즘을 이용한 경로 계획은 이동 로봇이나 게임 유닛이 주어진 환경에서 장애물과 충돌 없이 이동 가능한 경로를 찾는데 많이 사용된다. 그러나 $A^*$ 알고리즘은 출발 지점에서 목적 지점까지의 최단 거리를 갖는 경로를 찾는다. 두 지점 사이에 장애물이 있는 경우, 최단 경로는 보통 두 지점 사이의 장애물의 모서리를 스치는 경로이다. 따라서 로봇이나 게임 유닛이 최단 경로로 이동할 때, 장애물의 모서리에 부딪힐 수 있는 위험성이 커진다. 일반적인 격자 지도의 한 셀은 장애물이 있는 경우의 무한대의 비용과 장애물이 없는 경우의 비용을 갖는다. 본 논문에서는 장애물에 가까울수록 장애물이 없는 경우보다 높은 비용을 갖는 점층적 격자 지도(gradation grid map)를 이용한다. 점층적 격자 지도를 통해 $A^*$ 알고리즘은 장애물 근처의 높은 비용을 갖는 셀을 되도록 통과하지 않는 경로, 즉 보다 안전한 경로를 생성한다.

• Korean Chemical Engineering Research
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• v.52 no.4
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• pp.467-474
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• 2014

Preliminary design in chemical process furnishes economic feasibility through calculation of both mass balance and energy balance and makes it possible to produce a desired product under the given conditions. Through this design stage, the process possesses unchangeable characteristics, since the materials, reactions, unit configuration, and operating conditions were determined. Unique characteristics could be very economic, but it also implies various potential risk factors as well. Therefore, it becomes extremely important to design process considering both economics and safety by integrating process simulation and quantitative risk analysis during preliminary design stage. The target of this study is LNG liquefaction process. By the simulation using Aspen HYSYS and quantitative risk analysis, the design variables of the process were determined in the way to minimize the inherent explosion risks and operating cost. Instead of the optimization tool of Aspen HYSYS, the optimization was performed by using stochastic optimization algorithm (Covariance Matrix Adaptation-Evolution Strategy, CMA-ES) which was implemented through automation between Aspen HYSYS and Matlab. The research obtained that the important variable to enhance inherent safety was the operation pressure of mixed refrigerant. The inherent risk was able to be reduced about 4~18% by increasing the operating cost about 0.5~10%. As the operating cost increases, the absolute value of risk was decreased as expected, but cost-effectiveness of risk reduction had decreased. Integration of process simulation and quantitative risk analysis made it possible to design inherently safe process, and it is expected to be useful in designing the less risky process since risk factors in the process can be numerically monitored during preliminary process design stage.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.5
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• pp.543-548
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• 2017

This paper examines the effects of strong corporate governance for listed companies in accessing capital markets from the point of view of the weighted average cost of capital. Results found that corporate governance had a significant negative(-) relation to the weighted average cost of capital. This finding is consistent with previous research and implies that the higher shareholder ownership and foreign ownership have confidence in the financial information of the company, and therefore, risk is reduced for investors. This results in lower expected rates of return and companies will pay a lower cost of capital. Second, tax evasion had a positive effect(+) on the weighted average cost of capital. The low quality of corporate accounting information is expected to increase tax avoidance. Accordingly, this results in increased risk. If the required rate of return is high in its impact,it leads to increased capital costs. In addition, corporate governance and tax avoidance factors showed a negative affect (-) on the weighted average cost of capital. Corporate governance plays an important role in tax avoidance and the weighted average cost of capital, and strong corporate governance reducesthe impact on tax avoidance. In addition, the weighted average cost of capital in capital markets showed the reducing effect.