• International Journal of Computer Science & Network Security
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• 제21권9호
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• pp.239-246
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• 2021

This article substantiates the scientific provisions for modelling the level of Ukraine's public financial security taking into account the impact of budget policy, in the process of which identified indicators of budget policy that significantly affect the public financial security and the factors of budget policy based on regression analysis do not interact closely with each other. A seven-factor regression equation is constructed, which is statistically significant, reliable, economically logical, and devoid of autocorrelation. The objective function of maximizing the level of public financial security is constructed and strategic guidelines of budget policy in the context of Ukraine's public financial security are developed, in particular: optimization of the structure of budget revenues through the expansion of the resource base; reduction of the budget deficit while ensuring faster growth rates of state and local budget revenues compared to their expenditures; optimization of debt serviced from the budget through raising funds from the sale of domestic government bonds, mainly on a long-term basis; minimization of budgetary risks and existing threats to the public financial security by ensuring long-term stability of budgets etc.

• 정보처리학회논문지D
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• 제10D권5호
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• pp.773-780
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• 2003

SecuROS(Secure & Reliable Operating System) 시스템은 FreeBSD 4.3 운영체제 커널에 접근 제어, 사용자 인증, 감사 추적, 암호화 파일 시스템, 신뢰 채널 등의 보안 기능을 추가 구현하여 시스템에 발생 가능한 해킹을 방지하고 차단하는 시스템을 말한다. 본 논문에서는 SecuROS의 핵심 기술 중에 하나인 접근제어 기법을 기술하고, 해당 접근제어 정책인 DAC, MAC, RBAC의 구현 내용을 소개하며, 접근제어 정책의 적용에 따른 보안성과 성능 시험을 위한 도구 및 방법을 나타낸다. 기존의 운영체제 환경과 새로운 접근제어 정책을 적용한 환경 사이의 보안성 및 성능의 상관 관계를 기술한다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권11호
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• pp.5269-5286
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• 2018

Task scheduling is one of the key issues in improving system performance and optimizing resource management in cloud computing environment. In order to provide appropriate services for heterogeneous users, we propose a novel task scheduling strategy with service differentiation, in which the delay sensitive tasks are assigned to the rapid cloud with high-speed processing, whereas the fault sensitive tasks are assigned to the reliable cloud with service restoration. Considering that a user can receive service from either local SaaS (Software as a Service) servers or public IaaS (Infrastructure as a Service) cloud, we establish a hybrid queueing network based system model. With the assumption of Poisson arriving process, we analyze the system model in steady state. Moreover, we derive the performance measures in terms of average response time of the delay sensitive tasks and utilization of VMs (Virtual Machines) in reliable cloud. We provide experimental results to validate the proposed strategy and the system model. Furthermore, we investigate the Nash equilibrium behavior and the social optimization behavior of the delay sensitive tasks. Finally, we carry out an improved intelligent searching algorithm to obtain the optimal arrival rate of total tasks and present a pricing policy for the delay sensitive tasks.

• 보건행정학회지
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• 제26권4호
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• pp.256-264
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• 2016

Equity-focused public health policy has solid theoretical and practical basis, in addition to ethical one. In the Republic of Korea (hereafter Korea), however, equity in health has not had a high priority in policy goals, regardless of policy areas and particular actors or approaches. Equitable health has been only a minor concern in most public health issues and their decision-making. Generic public health policies are needed to reduce inequity in health, but the importance of a firm basis for sound policy-making cannot be overemphasized. Health equity should be 'mainstreamed' in all public health policies. Potential approaches include intersectoral collaboration, health impact assessment, and 'Health in All Policies.' Public policy agendas for equitable health cannot be formulated without measurement and recognition of the problem. Korea is still suffering from the lack of reliable information on the current status of health inequity, resulting in a relatively weak awareness of the problem among both the general public and policy-makers. More information is needed to increase recognition and awareness that will increase intervention and actions. The absence of decision-making and actions should not be justified even by the lack of information on determinants and pathways of health inequities. Generic plausible solutions can often work in the real world according to political and social commitment. I have discussed several aspects of public health policy from the perspective of health equity, focusing on current status and plausible explanation. Policy process, agenda setting in particular, is highlighted and theories and concepts are presented along with analysis and description of current situation.

• 환경정책연구
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• 제3권2호
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• pp.89-112
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• 2004

This Study aims to demonstrate how much flood vulnerability in urban area changed for the past 32 years by using the panel model. At the same time, this study strives to determine the primary factors and to construct an effective counter-plan by means of empirical research. After selecting research hypotheses based on considerations of issues concerning causes for urban flooding, their relevance is put to the test by conducting empirical research in individual case locations. This research verifies the four research hypotheses by using one-way error component regression model. In conclusion, this research has shown that urban land use and local characteristics act as significant flood determinants, with forests acting to reduce flood dangers. Moreover, constructing embankments can no longer represent a reliable flood control policy. The changes in future flood control policies need to incorporate local characteristics and to minimize natural destruction, so that humans and nature can coexist through environmentally friendly flood management policies.

• ETRI Journal
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• 제6권3호
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• pp.17-20
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• 1984

A block replacement policy using items with different reliability is discussed. We devide system unit failure modes into two modes and use less reliable unit when operating unit fails near the planned preventive replacement time. In this policy, item A has two failure modes. Mode-1 failure is removed by minimal repair, mode-2 failure by replacement. If mode-2 failure of item A happens in (0,T- $\delta$). failure item A is replaced by new item A. If mode-2 failure of item A happens in(T-$\delta$,T), failure item A is replaced by new item B. Item B should be cheaper and less durable than item A. Under this policy, we determine the preventive replacement interval T and the interval $\delta$ of item B replacement which minimize the cost rate per unit time.

• 스마트미디어저널
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• 제10권2호
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• pp.48-54
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• 2021

Sepsis is one of the leading causes of mortality globally, and it costs billions of dollars annually. However, treating septic patients is currently highly challenging, and more research is needed into a general treatment method for sepsis. Therefore, in this work, we propose a reinforcement learning method for learning the optimal treatment strategies for septic patients. We model the patient physiological time series data as the input for a deep recurrent Q-network that learns reliable treatment policies. We evaluate our model using an off-policy evaluation method, and the experimental results indicate that it outperforms the physicians' policy, reducing patient mortality up to 3.04%. Thus, our model can be used as a tool to reduce patient mortality by supporting clinicians in making dynamic decisions.

• 정보보호학회논문지
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• 제26권5호
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• pp.1105-1119
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• 2016

SEAndroid(Security-Enhanced Android)는 안드로이드(Android) 운영체제의 핵심 보안 요소로 적용되어있다. 리눅스와 안드로이드의 구조적 차이점이 존재함에 따라 SELinux(Security-Enhanced Linux)를 SEAndroid로서 안드로이드에 적용하고 있는데, SEAndroid의 보안은 신뢰성 있는 정책에 기반하므로 이러한 정책이 변조되는 경우에는 심각한 보안 문제가 발생할 수 있다. 따라서 SEAndroid의 가장 중요한 요소인 정책을 안전하기 보호하기 위한 방법에 관한 연구는 반드시 필요하다. 본 논문에서는 안드로이드에 현재 적용되어 있는 SEAndroid 정책 업데이트 프로세스를 분석하여 보안 취약점을 파악하고, 정책 변조 공격이 가능한 다양한 경로에 대해 분석한다. 그리고 이러한 변조 공격으로부터 정책을 보호할 수 있는 기법인 SPPA(SEAndroid Policy Protection Architecture)를 제안한다. SPPA는 개별 정책에 대한 검증 과정을 통해 정책의 신뢰성과 무결성을 보장하며, PWRM(Policy Writing Rule Monitoring)을 이용하여 버전 다운그레이드 공격을 방지한다. 마지막으로 모바일 디바이스에서 제안한 기법을 구현하여 기기에 미치는 영향 및 성능을 검증한다.

• 한국비블리아학회지
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• 제27권2호
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• pp.171-191
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• 2016

6개 정책연구기관 홈페이지에서 웹자원을 정보자원으로 수집 제공하는 사례를 조사하고, 이들이 정책정보의 가치를 가진 웹자원으로 서비스 되는지를 내용분석법으로 분석하였다. 이를 위하여 정책연구기관에서 정책정보로 제공되는 웹자원을 4개 부문으로 구분 평가하였다. 평가는 내용, 디자인, 접근용이성, 메타데이터의 4개 부문의 10개 항목에서 이루어졌다. 평가결과, 내용에서 신뢰성, 최신성을 유지하고 있었으나 정보내용의 좀 더 충실한 기술이 요구되었다. 디자인에서 네비게이션과 검색기능은 우수하였으나 모든 기관에서 데드링크가 존재하였다. 접근용이성에서 3회 클릭으로 정보 접근이 가능하였으나 검색기능의 정확도를 높이기 위해 메타데이터의 종합적인 검토가 필요함을 발견하였다. 개선점으로 데드링크 해결방안, 메타데이터의 질적관리, 정책연구정보의 전문적이고 체계적인 관리방안, 정책연구정보포털시스템의 종합적인 관리체제를 제안하였다.

• 디지털콘텐츠학회 논문지
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• 제16권1호
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• pp.1-12
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• 2015

본 논문에서는 새로운 신뢰 망 운용에 가상화 기술을 적용하기 위하여 기존 가상화 기술 연구동향 및 문제점을 분석하고, 가장 적합한 가상화 기술을 제시하고자 한다. 가상화 기술을 통하여 자원의 활용률을 높이고 관리비용을 절감할 수 있는 장점이 있다. 한편 보안 측면에서는 가상화를 통한 보안의 장점도 있는 반면에, 가상화의 도입으로 인한 새로운 취약성이 발생하여 이 문제에 대한 분석 및 대책이 필요하다. 따라서 가상화 시스템의 보안 위협 요소들을 도출하고, 가상화 보안 정책에 대하여 분석하고 살펴본다.