• 디지털산업정보학회논문지
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• 제12권2호
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• pp.1-6
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• 2016

Several efforts to replace the use of existing fossil energy resources have already been made around the world. As a result, a new industry of renewable energy has been created, and efficient energy distribution and storage has been promoted intensively. Among the newly explored renewable energy sources, the most widely used one is solar energy generation, which has a high market potential. An energy storage system (ESS) is a system as required. In this paper, the design and implementation of an ESS for the efficient use of power in stand-alone street lights is presented. In current ESS applied to stand-alone street lights, either 12V~24V DC (from solar power) or 110V~220V AC (from commercial power) is used to recharge power in systems with lithium batteries. In this study, an ESS that can support both solar power and commercial power was designed and implemented; it can also perform emergency recharge of portable devices from solar powered street lights. This system can maximize the scalability of ESSes using lithium batteries with efficient energy conversion, with the advantage of being an eco-friendly technology. In a ripple effect, it can also be applied to smart grids, electric vehicles, and new, renewable storage markets where energy storage technology is required.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2010년도 추계학술대회
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• pp.531-534
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• 2010

본 논문에서는 공유형 태양 에너지 기반 센서 시스템을 위한 가상 에너지 시스템의 개념을 이용한 효율적인 에너지 관리 기법을 소개한다. 가상 에너지 시스템은 한 센서 노드에서 동시에 수행되는 여러 응용들이 각각 자신이 사용할 에너지양을 예약하여 사용할 수 있게 하는 추상화 계층이다. 이렇게 함으로서 응용과 시스템의 수정 없이, 수집되는 태양 에너지를 각 응용에서 조화롭게 사용할 수 있고, 따라서 태양 에너지의 효율적 사용이 가능하게 된다. 실험 결과는 가상 에너지 시스템이 효율적이고 안정적으로 동작하여, 한 센서 노드에서 여러 응용이 조화롭게 실행됨을 보여주고 있다.

• ETRI Journal
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• 제37권1호
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• pp.107-117
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• 2015

This paper presents an energy-efficient (low power) prime-field hyperelliptic curve cryptography (HECC) processor with uniform power draw. The HECC processor performs divisor scalar multiplication on the Jacobian of genus 2 hyperelliptic curves defined over prime fields for arbitrary field and curve parameters. It supports the most frequent case of divisor doubling and addition. The optimized implementation, which is synthesized in a $0.13{\mu}m$ standard CMOS technology, performs an 81-bit divisor multiplication in 503 ms consuming only $6.55{\mu}J$ of energy (average power consumption is $12.76{\mu}W$). In addition, we present a technique to make the power consumption of the HECC processor more uniform and lower the peaks of its power consumption.

• KIEAE Journal
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• 제14권5호
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• pp.67-73
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• 2014

This study aims at examining kinetic efficient shading systems and their implementation methods. These days, the importance of the shading devices are getting more significant due to the energy problem. Cordially, suitable shade designs are required as an important element for the exterior envelope of the building. This study employs the optimal shading design as an efficient shading method with the kinetic system that can be converted actively by the altitude of the sun. The proposed kinetic shading system works not only as a lightshelf in case the altitude of the sun is high but also as a vertical louver when the sun is getting lower in order to block the direct sunlight. This study has analyzed the thermal performance and shading coefficient of the kinetic shading system in comparison to existing fixed shading devices using the Ecotect. The results, in sum, conclude that the suggested kinetic shading system could decrease direct sunlights 26.2% more than the existing shading methods.

• 한국공간정보시스템학회 논문지
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• 제12권1호
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• pp.1-9
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• 2010

최근, 무선 센서 네트워크 기술은 유비쿼터스 컴퓨팅 시대의 핵심 기반 기술의 하나로 인식되고 있다. 센서 노드는 제한된 배터리 용량을 가지기 때문에, 장기간 생존하기 위해서 노드들의 동작에 적은 에너지를 소모해야한다. 따라서, 에너지를 효율적으로 사용하는 프로토콜이 필수적이다. 이를 위해 본 논문 에서는 에너지 사용량을 고려하여 에너지 소모가 적은 경로를 설정하는 위치 기반의 에너지 효율적인 라우팅 프로토콜을 제안한다. 아울러 메시지 전송이 원활하지 못한 경우를 처리하는 경로 재설정 알고리즘을 제안한다. 마지막으로 TOSSIM을 이용한 성능평가를 통해, 제안한 프로토콜이 에너지 효율성 측면에서 기존 위치기반 라우팅 프로토콜 보다 우수함을 보인다.

• Journal of Information Processing Systems
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• 제6권4호
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• pp.501-510
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• 2010

Wireless sensor networks consist of sensor nodes which are expected to be battery-powered and are hard to replace or recharge. Thus, reducing the energy consumption of sensor nodes is an important design consideration in wireless sensor networks. For the implementation of an energy-efficient MAC protocol, a Sensor-MAC based on the IEEE 802.11 protocol, which has energy efficient scheduling, has been proposed. In this paper, we propose a Dynamic S-MAC that adapts dynamically to the network-traffic state. The dynamic S-MAC protocol improves the energy consumption of the S-MAC by changing the frame length according to the network-traffic state. Using an NS-2 Simulator, we compare the performance of the Dynamic S-MAC with that of the S-MAC protocol.

• 스마트미디어저널
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• 제4권1호
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• pp.25-32
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• 2015

Powering wireless sensors with energy harvested from the environment is coming of age due to the increasing power densities of both storage and harvesting devices and the electronics performing energy efficient energy conversion. In order to maximize the functionality of the wireless sensor network, minimize missing packets, minimize latency and prevent the waste of energy, problems like congestion and inefficient energy usage must be addressed. Many sleep-awake protocols and efficient message priority techniques have been developed to properly manage the energy of the nodes and to minimize congestion. For a WSN that is operating in a strictly energy constrained environment, an energy-efficient transmission strategy is necessary. In this paper, we present a novel transmission priority decision scheme for a heterogeneous body sensor network composed of normal nodes and an energy harvesting node that acts as a cluster head. The energy harvesting node's decision whether or not to clear a normal node for sending is based on a set of metrics which includes the energy harvesting node's remaining energy, the total harvested energy, the type of message in a normal node's queue and finally, the implementation context of the wireless sensor network.

• International Journal of Computer Science & Network Security
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• 제23권7호
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• pp.119-130
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• 2023

Worldwide organizations use the benefits offered by Cloud Computing (CC) to store data, software and programs. While running hugely complicated and sophisticated software on cloud requires more energy that causes global warming and affects environment. Most of the time energy consumption is wasted and it is required to explore opportunities to reduce emission of carbon in CC environment to save energy. Many improvements can be done in regard to energy efficiency from the software perspective by considering and paying attention on the energy consumption aspects of software's that run on cloud infrastructure. The aim of the current research is to propose a framework with an additional phase called parameterized development phase to be incorporated along with the traditional Software Development Life cycle (SDLC) where the developers need to consider the suggested techniques during software implementation to utilize low energy for running software on the cloud and contribute in green computing. Experiments have been carried out and the results prove that the suggested techniques and methods has enabled in achieving energy consumption.

• 디지털산업정보학회논문지
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• 제12권3호
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• pp.231-257
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• 2016

Several efforts to replace the use of existing fossil energy resources have already been made around the world. As a result, a new industry of renewable energy has been created, and efficient energy distribution and storage has been promoted intensively. Among the newly explored renewable energy sources, the most widely used one is solar energy generation, which has a high market potential. An energy storage system (ESS) is a system as required. In this paper, the design and implementation of an ESS for the efficient use of power in stand-alone street lights is presented. In current ESS applied to stand-alone street lights, either 12V~24V DC (from solar power) or 110V~220V AC (from commercial power) is used to recharge power in systems with lithium batteries. In this study, an ESS that can support both solar power and commercial power was designed and implemented; it can also perform emergency recharge of portable devices from solar powered street lights. This system can maximize the scalability of ESSes using lithium batteries with efficient energy conversion, with the advantage of being an eco-friendly technology. In a ripple effect, it can also be applied to smart grids, electric vehicles, and new, renewable storage markets where energy storage technology is required.

• 한국정보통신학회논문지
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• 제14권11호
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• pp.2569-2574
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• 2010

본 논문에서는 여러 개의 센서 응용프로그래밍이 함께 동작하는 공유형 태양 에너지 기반 센서 노드에서, 수집되는 태양 에너지의 효율적 활용을 위한 가상 에너지 시스템 기법을 소개한다. 가상 에너지 시스템은 한 센서 노드에서 동시에 수행되는 여러 응용들이 각각 자신이 사용할 에너지를 전체 시스템으로부터 분리하고 예약하여, 어느 정도 예측 가능한 성능을 가대할 수 있게 해주는, 에너지 시스템 추상화 계층이다. 실험 결과는 가상 에너지 시스템이 효율적이고 안정적으로 동작하여, 한 센서 노드에서 여러 응용이 조화롭게 실행됨을 보여 주고 있다.