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

• 디지털융복합연구
• /
• 제11권3호
• /
• pp.363-369
• /
• 2013

본 논문은 뇌에서 발생하는 언어와 관련된 현상들을 모델링하여 외국어 능숙도 측정 방법을 설계 및 개발하였다. 이 방법은 인지 심리학에서 인지능력을 측정하는 방법에 기반하며, 어휘 판단 과제, 언어 점화 과제, 구어 작업 기억 능력 측정 과제로 나뉜다. 어휘 판단 과제는 자극에 대해 단어인지 비 단어인지를 얼마나 빠르게 판단하는 지를 측정한다. 어휘 판단 과제는 세부적으로 자극의 형태에 따라 읽기와 듣기로 나뉜다. 언어 점화 과제는 언어의 산출 능력을 측정한다. 언어 점화 과제는 자극에 따라 의미적 점화 과제, 번역 점화 과제로 나뉜다. 구어 작업 기억 능력은 학습자의 단기 기억력을 측정한다. 본 논문에서는 제2외국어에 대한 학습자의 언어 인지능력을 사용하여 외국어 능숙도를 측정하는 방법을 제안한다.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제18권5호
• /
• pp.1238-1259
• /
• 2024

Previous studies on joint optimization of computation offloading and service caching policies in Mobile Edge Computing (MEC) have often neglected the impact of dependency-aware subtasks, edge server resource constraints, and multiple users on policy formulation. To remedy this deficiency, this paper proposes a many-objective joint optimization dependency-aware task offloading and service caching model (MaJDTOSC). MaJDTOSC considers the impact of dependencies between subtasks on the joint optimization problem of task offloading and service caching in multi-user, resource-constrained MEC scenarios, and takes the task completion time, energy consumption, subtask hit rate, load variability, and storage resource utilization as optimization objectives. Meanwhile, in order to better solve MaJDTOSC, a many-objective evolutionary algorithm TSMSNSGAIII based on a three-stage mating selection strategy is proposed. Simulation results show that TSMSNSGAIII exhibits an excellent and stable performance in solving MaJDTOSC with different number of users setting and can converge faster. Therefore, it is believed that TSMSNSGAIII can provide appropriate sub-task offloading and service caching strategies in multi-user and resource-constrained MEC scenarios, which can greatly improve the system offloading efficiency and enhance the user experience.

• Strategy21
• /
• 통권39호
• /
• pp.163-197
• /
• 2016

The completion of Jeju Naval Base on February 2016 made the Republic of Korea Navy(ROKN) review the size and role of the Maritime Task Flotilla(MTF). The new strategic environment for the 12st century and the new challenges require the Navy to counter North Korea's provocations and prevent potential enemy's threat. The Navy is also required to take part in the variety of international roles and missions commensurated with Korea's global status to maximize the national interest. Despite these changes, Korea's military construction concept is still unable to break away from the old paradigm of the North Korean threat largely centered. In order to develop the current MTF into the Task Group with the construction of Jeju Naval Base, the Navy must newly not only establish new force development plan and fleet management concepts but also go to persuade and convince policy decision makers. To this end, the following efforts should be promoted. First, the ROK Navy steps up efforts in order to share with the Task Group's vision and strategy. The Navy should also provide the size and structure as well as the missions and roles of the Task Group to react to new maritime security environment. Second, the Navy analyse the MTF's ability and what is required and necessary to perform its duty. After that, it must set out the direction of the Task Group's force development. Third, the current missions and roles of the MTF should be re-established to respond various threats. Finally, accommodating of new technology to the MTF should intensify its strengths. The ROK Navy has a mixed force structure consisting of three fixed- base fleets and a MTF. The fixed base fleet has a passive force to defend and protect its own sea areas, but the MTF should actively not only counter North Korea's threats, including ballistic missiles, but also fight potential threats and takes international missions as a primary task force. However, the MTF has a limited capability to accomplish given missions and long-range operations, and thus, the ROK Navy is strongly required to construct the Task Group.

• 보건행정학회지
• /
• 제27권2호
• /
• pp.97-102
• /
• 2017

On May 10, 2017, Moon Jae-in's Government launched. The election pledges of Moon's Government in healthcare sector were extracted from those of president election camp and Democratic Party. The main pledges were enhancing the coverage of healthcare costs, management of healthcare costs for elderly, restructuring the health insurance contribution system, and improving the public nature of healthcare system. There are many policy tasks to realize the electoral pledge, especially, financial task is main. The National Planning and Advisory Committee are setting the policy priorities and making the detailed plans. Although this paper deals the initial evaluation of main election pledges, the precise evaluation is needed for the final plan of healthcare policy.

• Journal of Computing Science and Engineering
• /
• 제2권1호
• /
• pp.74-97
• /
• 2008

A scheduling policy or a schedulability test is defined to be sustainable if any task system determined to be schedulable remains so if it behaves "better" than mandated by its system specifications. We provide a formal definition of sustainability, and subject the concept to systematic analysis in the context of the uniprocessor scheduling of periodic and sporadic task systems. We argue that it is, in general, preferable engineering practice to use sustainable tests if possible, and classify common uniprocessor schedulability tests according to whether they are sustainable or not.

• 한국융합학회논문지
• /
• 제9권11호
• /
• pp.345-351
• /
• 2018

이 연구는 지방공무원들의 역량강화 정책을 설명하고, 제한된 자원의 한계 속에서 효율성을 높일 수 있는 정책과제를 도출하는데 있다. 이를 위해 AHP분석 기법을 적용하여, 전문가 평가를 통해 정책과제의 상대적 우선순위를 도출하였다. 연구결과는 다음과 같다. 첫째, 지방공무원 역량강화를 위한 가장 큰 틀에서의 정책과제에서는 지방공무원 직무관리가 가장 중요하게 평가되었다. 다음으로 지방공무원 채용관리, 지방공무원 인사관리의 순으로 평가되었다. 둘째, 세부정책에 대한 평가 결과이다. 지방공무원 직무관리 중에서는 지방공무원 안식기간제 도입이 가장 중요하게 평가되었다. 지방공무원 채용관리에서는 공무원 시험과목 개편이 가장 중요하게 평가되었다. 지방공무원 인사관리에서는 선출직 공무원들에 대한 직무교육훈련이 가장 중요하게 평가되었다. 이러한 연구결과는 지방공무원 역량강화를 위한 정책개발을 현실적 측면에서 설명하는데 도움을 줄 것으로 사료된다. 향후 지방공무원 역량강화를 위해 측정변수들의 분석이 더욱 필요할 것으로 판단된다.

• 한국병원경영학회지
• /
• 제19권2호
• /
• pp.99-105
• /
• 2014

• 한국지역지리학회지
• /
• 제13권1호
• /
• pp.1-10
• /
• 2007

노무현 정부는 2006년부터 살기좋은 지역 만들기 정책을 본격 시행하고 있다. 이 정책은 우리들의 일상생활 공간인 지역사회 또는 지역을 대상으로 공간의 질과 삶의 질을 제고하기 위해 지방자치단체와 주민의 주도적 노력으로 아름답고, 쾌적하고, 특색있는 지역 공동체를 만들어 가는 것을 말한다. 이 정책은 한국사회의 질적 발전과 우리들의 일상적 삶의 만족도 증진이라는 양 차원에서 볼 때, 매우 긴요하고 시의 적절한 것으로 평가된다. 그러나 살기좋은 지역 만들기가 성공하기 위해서는 지역사회 또는 지역의 지리적 특성을 잘 이해하고 활용하지 않으면 안 될 것이다. 이러한 점에 유의하여 이 논문은 지리학 관점에서 살기좋은 지역 만들기 정책을 검토하고, 아울러 새로운 정책방향을 제시하고자 하였으며, 또한 지리학자들이 참여해야 할 과제에 대해서도 논의하였다.

• Asia pacific journal of information systems
• /
• 제8권2호
• /
• pp.105-119
• /
• 1998

As the first step to information security, the security policy and organizational control need to be established. The purpose of this study is to investigate the policy and management of information security of five major Korean business groups. The results of case study on five giant groups can be summarized as follows. There exists a basic policy for information security. But it is outdated and not realistic in the present. The security audit and education need to be upgraded. It is also necessary to use security tools actively. The security level is low in companies which do not have independent information security divisions. Therefore, it is desirable to build information security teams. The number of security personnel is not enough for the task although there exist an information security team in the company. It is important to check if the team has the ability of perform information security task. The interview with security managers reveals that the total security management should be integrated with physical and computer security. It is suggested that an Information Security Center play the major role for information security. The study on the information security management for industry level is expected to be performed in the future.