• Proceedings of the Korean Nuclear Society Conference
• /
• 2001.10a
• /
• pp.103.1-103
• /
• 2001

• Proceedings of the Korean Information Science Society Conference
• /
• 2005.11a
• /
• pp.580-582
• /
• 2005

VOIP 엑세스 게이트웨이는 원활한 VOIP 서비스를 위해 높은 호 처리 능력을 가져야 한다. 또한 여러 가지 VOIP 프로토콜을 지원 가능하여야 하고, 고품질 서비스를 위한 QoS 기능과 고신뢰성 및 고가용성을 가져야 하는 등 각종 요구사항을 만족하여야 한다. 본 논문에서는 일반적인 VOIP 엑세스 게이트웨이의 요구사항을 살펴보고, 하드웨어 블록 구조를 설명한 후, 높은 호 처리 성능을 가지면서 확장 및 변경 가능한 소프트웨어 구조를 설계하고 구현하였다.

• Electronics and Telecommunications Trends
• /
• v.33 no.1
• /
• pp.89-100
• /
• 2018

To accommodate the rapid increase in the amount of data traffic, the capacity of datacenters is expanding rapidly. Datacenter networks (DCNs) utilize electronic packet switches. However, the increases in the speed and capacity of electronic devices are slower than that of data expansion. Furthermore, electronics are too well developed to reach very near their physical limits. To achieve a breakthrough under this situation, optical switching schemes have been widely examined to replace or collaborate with incumbent electronic switches in a DCN. This report reviews the current status of such global researches on an optical DCN.

• Proceedings of the KIEE Conference
• /
• 2005.05a
• /
• pp.75-77
• /
• 2005

An integrated I&C architecture for nuclear power plants is designed by the systems and devices being developed in a project. Its design reference is the APR1400 that was design certified in Korea. Digital equipment and several kinds of data communication networks (DCN) are used. To confirm the validity of DCN based architecture design, the traffic loads fur each network were calculated assuming the anticipated maximum traffic condition. The analysis showed that the utilizations of all networks satisfied the design requirements.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• v.8 no.11
• /
• pp.3955-3966
• /
• 2014

With the exponentially increasing Internet traffic and emergence of more versatile and heterogeneous applications, the design of datacenter networks (DCNs) is subject to unprecedented requirements for larger capacity and more flexible switching granularities. Envisioning Optical-Orthogonal Frequency Division Multiplexing (O-OFDM) as a promising candidate for such a scenario, we motivate the use of O-OFDM as the underlying switching technology in order to provide sufficient switching capacity and elastic bandwidth allocation. For this purpose, this article reviews the recent progresses of DCN deployment and assesses the scenario where the O-OFDM transmission and switching technology is employed in the underlying transport plane. We discuss the key issues of the datacenter-oriented O-OFDM optical networks, and in particular, elaborate on a number of open issues and solutions including system interconnection architecture, routing and resource assignment, survivability, and energy-efficiency.

• Journal of The Korean Astronomical Society
• /
• v.52 no.3
• /
• pp.83-88
• /
• 2019

Using ALMA observations of the $^{13}CN$ and DCN lines in the massive star-forming region G33.92+0.11A, we investigate the CN/HCN abundance ratio, which serves as a tracer of photodissociation chemistry, over the whole observed region. Even considering the uncertainties in calculating the abundance ratio, we find high ratios (${\gg}1$) in large parts of the source, especially in the outer regions of star-forming clumps A1, A2, and A5. Regions with high CN/HCN ratios coincide with the inflows of accreted gas suggested by Liu et al. (2015). We conclude that we found strong evidence for interaction between the dense gas clumps and the accreted ambient gas which may have sequentially triggered the star formation in these clumps.

• Proceedings of the Korean Nuclear Society Conference
• /
• 1999.10a
• /
• pp.98-98
• /
• 1999

• Korean Chemical Engineering Research
• /
• v.47 no.2
• /
• pp.237-242
• /
• 2009

Various type of alternative fuel have been developed due to exhaustion of fossil fuel reserves and high oil price. Biodiesel is produced from the reaction of triglyceride, which is main component of animal fat and vegetable oil, and methanol by methanolysis as it is known for eco- friendly fuel for alternative petrodiesel. In this work, it was analyzed for the characteristics of the blended biodiesel with domestic petrodiesel according to blending ratio. Density, kinematic viscosity and flash point were increased with increasing the content of biodiesel. But the characteristic of blended biodiesel fuel were changed to aggravate in low temperature. Also, the derived cetane number(DCN) from IQT was increased by added biodiesel. Especially, the DCN of biodiesel from palm oil showed 71.26.

• Proceedings of the Korea Society for Simulation Conference
• /
• 1998.10a
• /
• pp.151-155
• /
• 1998

플랫폼 독립형 클래스 저장소(PICR : Platform Independent Class Repository)에 저장되어 있는 컴포넌트를 망관리 시스템의 분삭객체로 아웃소싱하여 사용하는 Farming 방법론을 실제 TMN 에이전트의 구축에 적용하였을 때 나타나는 결과를 ATM과 같은 고속망을 DCN(Data Communication Network)으로 하는 경우에 대하여 성능평가를 하였다.

• Journal of Internet Computing and Services
• /
• v.3 no.2
• /
• pp.57-67
• /
• 2002

The main goal of this paper is to establish the management network structure by adopting TMN concept. Hence, the management network structure consists in layers; from management application layer to lower physical layer In this paper, TMN-DCN structure is designed. That means, since the current communication network technology has developed so fast and new and more diverse communication networks have appeared, There is a need to process each management information in fast manner, The design method of management network physical structure that enhances the efficiency in network management with prompt transmission and reception of management information is proposed and the architecture is designed as well. Although there is some increase in installation fee for total link that constitutes the physical structure in lower physical layer. network management can be promptly implemented since the structure that can transfer the management information fastest is proposed.