• 디지털산업정보학회논문지
• /
• 제9권3호
• /
• pp.49-57
• /
• 2013

Power-saving PC software enables the inexpensive power control, but the installation of the power-saving software in all computers in the organization is not an easy task. Computer users in the organization are usually not cooperative as they do not think the power-saving cost is directly related to themselves. The PC power-saving system provides advantage to driving active participation in which users installs the power saving software by restricting IP address through the power management server. However, the problem with this approach is the security vulnerability to IP spoofing attacks, therefore we need to solve the problem that disrupt the entire network system rather than saving electric power. This paper proposes the security authentication system that can implement the efficiency saving power by providing high security for the members' computer system of the public institutions based on the PC power-saving system. Also, by analyzing it in comparison with other method, it is possible to check that the prospects of safety and efficiency are strengthened.

• Journal of Communications and Networks
• /
• 제14권2호
• /
• pp.179-187
• /
• 2012

Power saving is one of the most important features that extends the lifetime of portable devices in mobile wireless networks. The IEEE 802.16e mobile broadband wireless access system adopts a power saving mechanism with a binary truncated exponent algorithm for determining sleep intervals. When using this standard power saving scheme, there is often a delay before data packets are received at the mobile subscriber station (MSS). In order to extend the lifetime of a MSS, the battery energy must be used efficiently. This paper presents a dynamically alternating sleep interval scheduling algorithm as a solution to deal with the power consumption problem. We take into account different traffic classes and schedule a proper sequence of power saving classes. The window size of the sleep interval is calculated dynamically according to the packet arrival rate. We make a tradeoff between the power consumption and packet delay. The method achieves the goal of efficiently reducing the listening window size, which leads to increased power saving. The performance of our proposed scheme is compared to that of the standard power saving scheme. Simulation results demonstrate the superior performance of our power saving scheme and its ability to strike the appropriate performance balance between power saving and packet delay for a MSS in an IEEE 802.16e mobile broadband wireless access system.

• 한국산업정보학회논문지
• /
• 제15권5호
• /
• pp.1-9
• /
• 2010

DHCP 절전시스템은 전원 관리 서버가 IP 주소를 제한함으로써 사용자가 절전 소프트웨어 설치에 능동적으로 참여하도록 유도하는 장점이 있다. 그러나 이 방법에서의 문제점은 IP spoofing공격에 취약하여 절전의 효과보다는 전체 시스템이 마비되는 우를 범할 수 있을 것이다. 본 논문에서는 위와 같은 절전시스템을 기반으로 공공기관의 조직원 컴퓨터에 대한 높은 보안성을 제공함으로써 효율적인 절전을 구현할 수 있는 인증 시스템을 제안한다.

• 한국ITS학회 논문지
• /
• 제9권1호
• /
• pp.49-54
• /
• 2010

최근 차세대 이동통신 기술로 각광받고 있는 3GPP LTE(Long Term Evolution) 시스템을 위한 기지국에서의 power saving에 관한 연구가 이슈화 되고 있다. 이는 무선통신 네트워크에서 가장 많은 에너지를 소모하는 부분이 기지국 부분이기 때문이다. 또한 기지국에서의 power saving은 세계가 주목하고 있는 저탄소 배출 녹색 기술에도 부합하는 내용이기도 하다. 따라서 본 논문에서는 UE(User Equipment)의 Traffic의 종류에 따라 DRX/DTX의 주기를 차등적으로 적용함으로써 기존에 일정한 DRX/DTX 주기를 적용하는 방식에 비해 성능은 떨어지지 않으면서 에너지 효율을 극대화하는 방식을 제안한다. 제안된 방식에 따른 모의실험 결과 기존의 방식에 비해서 개선된 power saving 성능을 확인할 수 있다. 본 논문에서는 LTE 기지국과 UE가 통신하는 환경에서 기지국의 에너지를 절약할 수 있는 MAC 프로토콜을 제안하고 시뮬레이션을 통하여 성능이 향상되었음을 확인한다

• 한국항행학회논문지
• /
• 제10권4호
• /
• pp.306-311
• /
• 2006

WiBro/WLAN Hierarchical 네트워크 구성 시 듀얼모드 단말기는 Hotspot 지역 이외의 WiBro 네트워크만 존재하는 지역에서도 Vertical 핸드오프를 위해서 항상 WLAN 모듈을 Power on 상태로 유지해야 한다. 핫스팟 지역이 아닌 WiBro 네트워크에서도 듀얼모드 단말기의 WLAN 모듈을 Power on 상태로 유지하기 때문에 사용자의 단말은 불필요한 전력을 소모하게 된다. 본 논문은 이를 보완할 수 있는 WiBro/WLAN Hierarchical 네트워크에서 듀얼모드 단말기의 Power Saving 전략에 관해 다루었다. 본 논문에서는 WiBro 네트워크 내의 핫스팟에 대한 정보를 이용하여 듀얼모드 단말기의 효율적인 Power Saving 전략을 수립하고자 한다.

• 디지털산업정보학회논문지
• /
• 제9권2호
• /
• pp.89-97
• /
• 2013

The green IT technology is being introduced in diverse sectors, especially in the data center and green computer sectors. Rack-type PCs, which have been developed by improving the computer hardware, are effective for data centers and large businesses, but they are not usually introduced in small organizations such as small and medium businesses and schools because they require high initial costs. Power-saving PC software enables the inexpensive power control, but the installation of the power-saving software in all computers in the organization is not an easy task. Computer users in the organization are usually not cooperative as they do not think the power-saving cost is directly related to themselves. In this paper, a technique wherein the server has a restriction in providing the IP address to the computers that has no power-saving software is proposed, so that users will cooperate in the PC power-saving system to avoid inconvenience. In order to provide restricted IP address periodically, the server makes a request of power-saving software installation check for user's PC. Proposed technique is more effective ways to save computer energy, because it does not depend on specific systems or organizations.

• ETRI Journal
• /
• 제35권2호
• /
• pp.253-258
• /
• 2013

We propose and demonstrate an efficient power-saving optical network unit (ONU) based on upstream traffic monitoring for 10-Gb/s wavelength division multiplexed passive optical networks (WDM-PONs). The power-saving mode controller uses a ${\mu}$-processor and traffic monitoring modules followed by the proposed power-saving processes to operate the sleep mode ONU. The power consumption of the ONU is effectively reduced from 19.3 W to 6.4 W when no traffic from the users is detected. In addition, we design a power-saving mechanism based on a cyclic sleep mode operation to allow a connectivity check between the optical line terminal and ONU. Our calculation results show that the WDM-PON ONU reduces the power consumption by around 60% using the proposed mechanism.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2005년도 추계종합학술대회
• /
• pp.311-316
• /
• 2005

The power saving mechanism of IEEE 802.16e operates in two modes; awake mode and sleep mode. While the user terminal transmits and receives packets in awake mode, it sleeps for a given interval to save the power consumption in sleep mode. The IEEE 802.16e specifies that the user terminal increases the sleep interval exponentially unless it has to wake up. In this paper, we analyze the performance of IEEE 802.16e power saving mechanism by considering down link traffic conditions. With the extensive simulations, we observe the trade-off between the power saving performance and the average packet delay. In addition, we observe that various performance parameters of IEEE 802.16e power saving mechanism are affected by the traffic patterns.

• 한국정보과학회논문지:정보통신
• /
• 제37권3호
• /
• pp.243-248
• /
• 2010

시스템에서 UE의 QoS를 보장하면서 효율적인 power saving을 위해 본 논문에서는 delay 정보를 이용하여 3GPP(Third Generation Partnership Project) 규격에서 제시한 DRX/DTX(Discontinuous. Reception/Transmission)의 차등적 적용 MAC 프로토콜을 제안한다. 제안한 MAC 프로토콜은 LTE 기지국에서 각 UE의 QoS를 고려하여 적응적으로 DRX/DTX 주기를 제어한다. UE의 패킷 delay가 적은 경우에 DRX/DTX 주기를 늘려 에너지를 절약하고 패킷 delay가 커지면 기지국의 DRX/DTX 주기를 줄여 delay를 줄이고 UE의 QoS를 보장한다. DRX/DTX의 차등적용에 따른 모의실험 결과 제안된 power saving 방식은 DRX/DTX를 상황에 따라 변화시키지 않는 방식에 비해 개선된 power saving 성능을 제공하며 특히 상황에 맞게 DRX/DTX를 설정하여 UE의 요구사항을 충족시킬 수 있다. 본 논문에서는 LTE 기지국과 UE가 통신하는 환경에서 기지국의 에너지를 절약할 수 있는 MAC protocol을 제안하고 시뮬레이션을 통하여 성능이 향상되었음을 확인한다.

• 정보통신설비학회논문지
• /
• 제9권4호
• /
• pp.124-130
• /
• 2010

This paper considers a power saving technique of set-top box (STB) that turns the signal into content which is then displayed on the television (TV) screen. A traditional power saving scheme, Auto Power Down (APD), was devised to reduce the power consumption of STB. APD checks whether the user is watching TV over a period of time and enforces STB into stand-by mode when the check result reveals the user is not watching TV. This paper proposes an enhanced power saving scheme that transits STB operation mode to 'stand-by' immediately when STB recognizes the change of TV's external input signal. The proposed scheme does not require the monitoring time to check the users' watching TV, and transits to standby mode faster than the conventional APD, which results in better performance in power saving. The simulation result shows that the proposed scheme achieves 2 to 11% improvement in power consumption compared with the conventional APD.