• 공학교육연구
• /
• 제12권1호
• /
• pp.3-16
• /
• 2009

이 연구의 목적은 국가공인 민간자격의 활용도를 높이기 위한 다양한 방안을 마련하는데 있으며 이를 위한 세부 목표는 첫째, 자격의 기능에 대한 다양한 학문 분야의 이론과 선행연구 분석을 통해 국가공인 민간자격의 활용 영역과 범위를 재정립하는데 있다. 둘째, 국가공인 민간자격 활용 강화 방향을 설정하는데 있다. 연구 방법으로는 문헌 및 관련 자료 수집 분석, 설문 조사, 전문가협의회 및 간담회 등을 실시하였다. 이 연구에서는 자격의 기능에 대한 다양한 학문분야에서의 논의를 바탕으로 하여 자격의 활용 범위를 자격취득자 개인의 내적 활용과 사회 경제적인 외적 활용으로 구분하고 이러한 구분을 기초로 국가공인 민간자격의 활용성 강화 방안을 마련하였다. 먼저, 국가공인 민간자격의 내적 활용성을 강화하기 위한 방안으로는 접근성 강화 방안과 향상성 강화 방안을 마련하였다. 접근성 강화 방안에는 응시 요건 설정의 제한, 자격검정방식의 다양화, 부분 자격제도의 활성화, 자격취득 비용의 최소화를 제시하였다. 또한 향상성 강화 방안에서는 직무수준 중심의 등급체계 설정, 직무중심의 단계적 자격종목 개발을 제시하였다. 그리고 국가공인 민간자격의 외적 활용성을 강화하기 위한 방안으로는 탄력성 강화 방안, 투명성 강화 방안, 공신력 강화 방안, 호환성 강화 방안을 마련하였다. 탄력성 강화 방안에는 자격 수요 모니터링 체제 구축, 자격관리에 수요자 직접 참여 확대, 자격 유효기간 설정 및 갱신을 제시하였다 투명성 강화 방안으로는 자격종합정보시스템 구축, 자격추천제 활용을 제시하였으며, 공신력 강화 방안으로는 자격관리규정 관리 강화, 검정업무의 독자성 확보, 내부감사체제 구축, 국가공인 민간자격에 대한 사후관리 강화를 제시하였다. 그리고 마지막으로 호환성 강화 방안으로는 자격간 호환성 비교기준 개발, 자격 수준체계 개발을 제시하였다.

• 한국통신학회논문지
• /
• 제37권8B호
• /
• pp.677-686
• /
• 2012

In the presence of a high power cellular network, picocells are added to a Macro-cell layout aiming to enhance total system throughput from cell-splitting. While because of the different transmission power between macrocell and picocell, and co-channel interference challenges between the existing macrocell and the new low power node-picocell, these problems result in no substantive improvement to total system effective throughput. Some works have investigated on these problems. Pico Cell Range Expansion (CRE) technique tries to employ some methods (such as adding a bias for Pico cell RSRP) to drive to offload some UEs to camp on picocells. In this work, we propose two solution schemes (including cell selection method, channel allocation and serving process) and combine new adaptive frequency partitioning reuse scheme to improve the total system throughput. In the simulation, we evaluate the performances of heterogeneous networks for downlink transmission in terms of channel utilization per cell (pico and macro), call blocking probability, outage probability and effective throughput. The simulation results show that the call blocking probability and outage probability are reduced remarkably and the throughput is increased effectively.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제13권1호
• /
• pp.186-205
• /
• 2019

Intercell interference coordination (ICIC) is considered as a promising technique to increase the spectral efficiency of OFDMA cellular systems. The soft frequency reuse (SFR) and fractional frequency reuse (FFR) are representative and efficient management techniques for ICIC. Herein, to enhance the performance of the SFR scheme, we propose a call admission (CAC) scheme. In this CAC scheme, called Spectrum handoff-SFR(S-SFR), the spectrum handoff technique is applied to the user equipment (UE) located near the cell center. We derive the traffic analysis model to describe the S-SFR. In addition, a two-dimensional (2-D) Markov chain and an outage analysis are used in our analytical model. From the traffic analysis, the significant performance measures are the outage probability, call blocking probability, system throughput and resource utilization. Based on those, the outage probability and system throughput are obtained using resource utilization as an interference pattern. The analytical results are verified with computer simulation results. Finally, we compare our proposed scheme with other ICI schemes.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제13권5호
• /
• pp.2258-2276
• /
• 2019

Resource sharing is one of the main goals achieved by network virtualization technology to enhance network resource utilization and enable resource customization. Though resource sharing can improve network efficiency by accommodating various users in a network, limited infrastructure capacity is still a challenge to ultra-low latency service operators. In this paper, we propose an inter-slice resource borrowing schema based on the device-to-device (D2D) potentiality especially for ultra-low latency transmission in cellular networks. An extended and modified Kuhn-Munkres bipartite matching algorithm is developed to optimally achieve inter-slice resource borrowing. Simulation results show that, proper D2D user matching can be achieved, satisfying ultra-low latency (ULL) users' quality of service (QoS) requirements and resource utilization in various scenarios.

• International Journal of Computer Science & Network Security
• /
• 제21권2호
• /
• pp.158-170
• /
• 2021

Virtualization technologies are being adopted and broadly utilized in many fields and at different levels. In cloud computing, achieving load balancing across large distributed virtual machines is considered a complex optimization problem with an essential importance in cloud computing systems and data centers as the overloading or underloading of tasks on VMs may cause multiple issues in the cloud system like longer execution time, machine failure, high power consumption, etc. Therefore, load balancing mechanism is an important aspect in cloud computing that assist in overcoming different performance issues. In this research, we propose a new approach that combines the advantages of different task allocation algorithms like Round robin algorithm, and Random allocation with different threshold techniques like the VM utilization and the number of allocation counts using least connection mechanism. We performed extensive simulations and experiments that augment different scheduling policies to overcome the resource utilization problem without compromising other performance measures like makespan and execution time of the tasks. The proposed system provided better results compared to the original round robin as it takes into consideration the dynamic state of the system.

• 한국정보통신학회:학술대회논문집
• /
• 한국정보통신학회 2022년도 춘계학술대회
• /
• pp.361-364
• /
• 2022

본 연구는 창작활동을 위한 인공지능 플랫폼의 종류를 조사하고 활용방안을 탐색하는 목적으로 수행되었다. 창작활동의 대표적인 영역인 미술과 음악 창작 영역에서 인공지능을 배우기 위해 인공지능을 체험하고 간단한 프로그래밍을 할 수 있는 인공지능 플랫폼의 종류를 조사하였다. 그리고 각 인공지능 플랫폼이 학생들의 생각을 풍부하게 표현하고 창의력을 높이는데 사용되도록 활용방안을 제시하였다. 이를 통해 인공지능 플랫폼이 창작활동에서 학생들의 표현력과 창의력을 높이는 도구로써 활용될 수 있음을 시사하였다는데 의의가 있다.

• 한국통신학회논문지
• /
• 제27권2A호
• /
• pp.146-156
• /
• 2002

This paper presents an adaptive H.263+ rate control algorithm for streaming video applications under the networks supporting bandwidth renegotiation, which can communicate with end-users to accommodate their time-varying bandwidth requests during the data transmission. That is, the requests of end-users can be supported adaptively according to the availability of the network resources, and thus the overall network utilization can be improved simultaneously. They are especially suitable for the transmission of non-stationary video traffics. The proposed rate control algorithm communicates with the network to renegotiate the required bandwidth fort the underlying video which are measured based on the motion change information, and choose their control strategies according to the renegotiation results. Unlike most conventional algorithms that control only the spatial quality by adjusting quantization parameters, the proposed algorithm treats both the spatial and temporal qualities at the same time to enhance human visual perceptual quality. Experimental results are provided to demonstrate that the proposed rate control algorithm can achieve superior performance to the conventional ones with low computational complexity under the networks supporting bandwidth renegotiation.

• Journal of Information Processing Systems
• /
• 제10권4호
• /
• pp.568-580
• /
• 2014

To enhance the utilization of the traffic channels of a network (instead of allocating radio channel to an individual user), a channel or a group of channels are allocated to a user group. The idea behind this is the statistical distribution of traffic arrival rates and the service time for an individual user or a group of users. In this paper, we derive the blocking probability and throughput of a subscriber station of Worldwide Interoperability for Microwave Access (WiMAX) by considering both the connection level and packet-level traffic under a complete partition scheme. The main contribution of the paper is to incorporate the traffic shaping scheme onto the incoming turbulent traffic. Hence, we have also analyzed the impact of the drain rate of the buffer on the blocking probability and throughput.

• 한국지리정보학회지
• /
• 제15권1호
• /
• pp.159-171
• /
• 2012

본 연구에서는 하천관리지리정보시스템(RIMGIS) 내 하천유지관리부분의 활용성 향상 및 하천유지관리업무의 선진화를 위하여 항공레이저측량(LiDAR)과 고해상 영상자료를 기반으로 한 동적으로 변화하는 하상자료 관리 및 하상변동 분석 등의 하천유지관리기술을 개발하였다. LiDAR 및 고해상도 영상 형식으로 제작된 하천의 정밀지형도를 이용하여 동적으로 변화하는 하천의 하상자료 및 제방자료를 정보화하여 RIMGIS DB를 구축하고, RIMGIS와 연계된 하천유지관리체계 구축 및 하상변동 영향을 최소화하는 모니터링 기술을 연구하였다. 또한, 하천 지형정보 및 유지관리정보 등을 가지고 있는 RIMGIS의 기능과 자료구조를 보완하여 하천의 실시간 유지관리가 가능하도록 개선하며, 하상정보와 하천단면정보를 제공하여 하천통수단면 확보 등 구조적 기법을 이용한 하천기능 유지가 가능하도록 RIMGIS 보완 기술을 개발하였다. 이는 기존의 2차원 선(線)기반으로 제공되는 한정된 하천정보 및 정확성이 결여된 자료제공의 문제를 보완하여 지속적인 RIMGIS 기능개선과 유지관리 작업이 가능하도록 지원하고, RIMGIS 내 하천유지관리부분의 활용성을 극대화할 수 있는 기반기술로 이용할 수 있을 것으로 기대된다.

• 한국IT서비스학회지
• /
• 제13권2호
• /
• pp.219-250
• /
• 2014

Corporations look for their competitiveness in many different areas, and one of them is customer call center, which provides professional, special service to the customers. The importance and the value of realization of customer satisfaction at each call center have become significant as it plays a leading role and is responsible for customer recreation and follow-up services. This study held in-depth interviews with 3 groups of professional call representatives (categorized by experience) from popular property and life insurance companies in Korea who operate in and outbound calls. Three variables, emotional quotient, organizational citizenship behavior (OCB), and IT utilization skill, were selected and it was observed how these variables affect the job performance of in and outbound call center representatives. The importance of the relationship between the variables and the key factors in the future direction of improvement of the call center representative organization was analyzed. Emotional quotient refers to the ability to recognize and use the emotion of oneself and others. It was considered it would be effective in enhancing the counseling ability of call center representatives, This study identifies the effect of emotional quotient on job performance and organizational citizenship behavior, which is defined as actions outside of normative roles in the organization. Also, the study aims to prove the effect of emotional quotient on the rapidly developing IT utilization ability in relation to job performance. As a result, it was found that service career (3 months, 3 years, 10 years) had a significant effect on the key factors that affect the organization-emotional quotient, IT utilization skill, and OCB. Especially for OCB, it was considered relatively less important to the new employees, while it greatly affected the job performance, rate of settlement, and sustainment of the working life for those with longer experience. Also, the result of the interview for each variable differed by the service career. Emotional quotient, IT utilization skill, and OCB were close connection for the representatives with longer experience than for those with shorter experience. And the level of intimacy of their relationship with job performance was in proportion to the years of service. Thus, to secure stability for the call center representatives and enhance their job performance continually, the importance of emotional quotient and IT utilization skill shall be reflected in the operation process actively. In particular, in order to lead a organization with outstanding culture, a management system shall apply OCB from the recruitment process.