• Electronics and Telecommunications Trends
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• v.24 no.4
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• pp.126-134
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• 2009

기존의 AC 전력전달 기반의 데이터센터를 고효율의 DC 데이터센터로 변경에 관한 연구가 활발히 진행중이다. 그 중 랙 준위 DC 전원공급장치는 기존 데이터센터의 전력구조 변화 없이 랙 레벨에서 DC 전원을 서버에 공급하는 방식으로 기존 AC 데이터센터에 적용 가능한 최적의 기술이다. 본 논문은 ETRI가 개발한 데이터센터의 랙 준위 DC 전원공급장치 특징에 관한 내용을 담고 있다. 본 장치는 부하에 따라 효율을 최적으로 제어하는 지능적 제어 기법을 사용하며, 랙 준위 N+ 1 전력 이중화로 높은 안정성을 제공하고 있다. 또한 랙 준위 전력 및 랙 주위 온/습도정보의 실시간 웹 모니터링 기능을 제공하고 있다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2019.05a
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• pp.454-455
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• 2019

IDC is a server-based facility with a stable line and power supply facility that manages 20 to 30 servers in an efficiently separated rack-level subnetwork. Here, we need a way to efficiently manage servers security, firewall, and traffic on a rack-by-rack basis. If three or five kinds of commercial equipment are adopted to support this, it may be a great burden to the management cost as well as the introduction cost. Therefore, in this paper, we propose a method to implement the five functions in one rack-unit small integrated security router. In particular, IDC intends to integrate traffic shaping and IPS, which are essential technologies, and to propose the utility accordingly.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.23 no.7
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• pp.861-868
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• 2019

Various server-based services such as big data, IoT and artificial intelligence have been made online. As a result, the demand for IDC to support stable server operation is increasing. IDC is a server-based facility with a stable line and power supply facility that manages 20 to 30 servers in an efficiently separated rack-level subnetwork. Here, we need a way to efficiently manage servers security, firewall, and traffic on a rack-by-rack basis. Including traffic shaping capabilities that control routers, firewalls, IPS, and line speeds, as well as VPN technology, a recent interest. If three or five kinds of commercial equipment are adopted to support this, it may be a great burden to the management cost as well as the introduction cost. Therefore, in this paper, we propose a method to implement the five functions in one rack-unit small integrated security router. In particular, IDC intends to integrate traffic shaping and IPS, which are essential technologies, and to propose the utility accordingly.

• Journal of the Korea Society of Computer and Information
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• v.20 no.4
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• pp.11-16
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• 2015

Data center, not only the development of globally of cloud-based IT solutions, As the big data, education, use of development electronic equipment of communication means is increased, Demand of domestic and international data center has increased steadily. Due to the increase of data center demand, heat generation of server rack due to the development of IT equipment is also increasing continuously. Calculating heat value of the data center, because more than 99% of the power usage of IT server is converted into heat, the calorific value as the size and capacity of the server is larger will increase. In this paper, to center the cooling system of air-cooled, and research and development of air conditioning systems for energy reduction of data center, through performance analysis and simulation, it has been analyzed that there is energy savings.

• Electronics and Telecommunications Trends
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• v.29 no.4
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• pp.49-58
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• 2014

마이크로프로세서 기술의 발전으로 멀티코어 저전력 x86 및 ARM CPU 기반의 마이크로서버가 출현하였다. 초기 마이크로서버는 기존 서버보다 작은 크기에 단순 집적도를 높인 구조에서 내 외부 스위치와 스토리지, 관리, 내부 연결망까지 기존의 랙 시스템을 대체 할 마이크로서버가 시장에 출시되고 있다. 특히 마이크로서버 시장에 ARM 프로세서의 가세로 x86 프로세서와 치열한 경쟁이 예상되고 있다. 본고를 통하여 마이크로서버의 특징과 시장, 제품 등에 관해서 살펴보도록 한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2018.10a
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• pp.11-12
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• 2018

대부분의 컴퓨팅 장비들은 교류 전력을 공급받지만 실제 직류로 동작하기 때문에 교류를 직류로 변환하는 전원 공급장치가 필수적이다. 문제는 이과정에서 손실 발생하기 때문에 이를 최소한으로 줄이는 방법이 필요한데 이를 위해 본 논문은 OCP에서 제안한 방법대로 랙 수준의 전원 공급 장치와 DC 서버의 전력 공급 연력 방법에 대해 설계하였으며 이렇게 구성하였을 경우 어떻게 에너지 절감량을 측정할 수 있는가에 대해 설명하였다. 이 방법대로 상용 데이터 센터에 실제 도입이 이루어진다면 데이터 센터 산업이 소모하는 에너지 사용량을 줄이는데 기여할 수 있을 것이다.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.24 no.3
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• pp.212-217
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• 2012

The cooling of data centers has emerged as a significant challenge as the density of IT equipment increased. With the rapid increasing of heat load and cooling system, predictions for electronics power trends have been closely watched. A data center power density projection is needed so that IT organizations can develop data centers with adequate cooling for reasonable lifetimes. This paper will discuss the need for something more than processor and equipment power trend projections which have overestimated the required infrastructure for customers. This projection will use data from a survey of actual enterprise data centers and the ASHRAE projections to formulate a data center server heat load trend projection.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.21 no.6
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• pp.91-97
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• 2021

A microserver is a type of a computing server, in which two or more CPU nodes are implemented on a separate computing board, and a plurality of computing boards are integrated on a main board. In building a cluster system, the microserver has advantages in several points such as energy efficiency, area occupied, and ease of management compared to the existing method of mounting legacy servers in multiple racks. In addition, since the microserver uses a fast interconnection network between CPU nodes, performance improvement for data transfers is expected. The proposed microserver can mount a total of 16 computing boards with 4 CPU nodes on the main board, and uses Serial-RapidIO (SRIO) as an interconnection network. In order to analyze the performance of the proposed microserver in terms of the interconnection network which is a core performance issue of the microserver, we compare and quantify the performance of commercial microservers. As a result of the test, it showed up to about 7 times higher bandwidth improvement when transmitting data using the interconnection network. In addition, with CloudSuite benchmark programs used in actual cloud computing, maximum 60% reduction in execution time was obtained compared to commercial microservers with similar CPU performance specification.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.7
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• pp.726-733
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• 2016

In this study, a computer simulation of the three types of air distribution systems, open type system, aisle partition system and aisle containment system, to evaluate the applicability of the aisle partition system on a data center server room. The variables of the simulation were the height and location of the partition fixed on the top server rack. The energy efficiency of the air distribution systems were confirmed to be excellent in the order of the aisle containment system, aisle partition system, and open type system. In the cold aisle partition system, the height of the partition that can be effective in saving cooling energy by obstructing sufficient air recirculation was found to be more than 0.9m. In the hot aisle partition system, the height of the partition was found to be more than 0.8m.

• Journal of the Korea Convergence Society
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• v.9 no.10
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• pp.69-74
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• 2018

IP and SIP public broadcasting systems developed in Korea and abroad are developed in a Windows or Linux server environments and are installed in a server-rack structure, have high power consumption, and are difficult to remotely respond to system failures. In this paper, IoT platform is designed to connect IoT device and gateway to IoT service server by using internet service structure. We also designed a server based on embedded OS that can provide a variety of public safety management services according to the order of the server with built-in call processing and broadcasting function that can handle emergency calls and emergency broadcasts in public places using this structure. This server is interoperable with a variety of SIP-based call and broadcast devices that support the standard SIP and can be integrated with an in-house phone and on-premises system.