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Dive into the research topics where Donghyouk Lim is active.

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Featured researches published by Donghyouk Lim.


Journal of Circuits, Systems, and Computers | 2008

EXPLOITING TEMPORAL LOCALITY FOR ENERGY EFFICIENT MEMORY MANAGEMENT

Euiseong Seo; Seungryoul Maeng; Donghyouk Lim; Joonwon Lee

Memory is becoming one of the major power consumers in computing systems. Therefore, energy efficient memory management is essential. Modern memory systems employ sleep states for energy saving. To utilize this feature, existing research activities have concentrated on increasing spatial locality to deactivate as many blocks as possible. However, they did not count the unexpected activation of memory blocks due to cache eviction of deactivated tasks. In this paper, we suggest a software-based power state management scheme for memory, which exploits temporal locality to relieve the energy loss from the unexpected activation of memory blocks from cache eviction. The suggested scheme SW-NAP makes a memory block remain deactivated during a certain tick, which has no cache miss over the block. The evaluation shows that SW-NAP is 50% better than PAVM, which is an existing software scheme, and worse than PMU, which is another approach based on the specialized hardware by 20%. We also suggest task scheduling policies that increase the effectiveness of SW-NAP and they saved up to 7% additional energy.


Peer-to-peer Networking and Applications | 2014

A real-time responsiveness measurement method of linux-based mobile systems for P2P cloud systems

Yung-Joon Jung; Donghyouk Lim; Yong Bon Koo; Eun-Ser Lee; Hoon Choi

Linux-based mobile computing systems such as robots, electronic control devices, and smart-phone are the most important types of P2P cloud systems in recent days. To improve the overall performance of networked systems, each mobile computing system requires real-time characteristics. For this reason, mobile computing system developers want to know how well real-time responsiveness is supported; several real-time measurement tools have been proposed. However, those previous tools have their own measurement schemes and we think that the results from those models do not show how responsive those systems are. In this paper, we propose ELRM, a new real-time measurement method that has clear measurement interval definitions and an accurate measurement method for real-time responsiveness. We evaluate ELRM on various mobile computing systems and compare it with other existing models. As a result, our method can obtain more accurate and intuitive real-time responsiveness measurement results.


international conference on consumer electronics | 2012

Cross-layer real-time support for JVM-based smartphone systems

Youngjoo Woo; Jungwook Cho; Donghyouk Lim; Euiseong Seo

The existence of the JVM layer hinders applications from notifying the operating system scheduler about their timeliness requirements and, therefore, the applications sometimes fail to respond on time. This research proposes a cross-layer real-time support by which applications notify operating systems about their timeliness requirements. Our prototype shows significant improvements in the response times and throughputs of prioritized applications.


Archive | 2012

Linux Based Real-Time Feature Supporting Method and Evaluation for Information Devices

Yung-Joon Jung; Donghyouk Lim; Chaedeok Lim; Eun-Ser Lee

Recently, demands of information devices are increasing as we can find so many information devices around us such as smartphone, mobile internet device (MID), tablet. These characteristics of information devices services should support soft real-time based time guaranteed multimedia services and control internet appliances. In this situation, soft real-time supported system should be developed to consider as a total aspect of hardware, kernel, middleware, application. But this paper will describe soft real-time supporting and evaluation methods for information device as an aspect of only kernel.


Archive | 2007

Application program launching method and system for improving security of embedded linux kernel

Kanghee Kim; Donghyouk Lim; Yongbon Koo; Yung-Joon Jung; Yong-Gwan Lim; Jaemyoung Kim


Archive | 2008

FLASH MEMORY DEVICE HAVING SECURE FILE DELETION FUNCTION AND METHOD FOR SECURELY DELETING FLASH FILE

Seung-Min Park; Jaemyoung Kim; Yung-Joon Jung; Donghyouk Lim; Youngbin Seo; Yookun Cho; Sangho Yi; Jaeheung Lee; Seok-hyun Kim; Jinha Oh


Archive | 2008

Drm method and drm system using trusted platform module

Yung-Joon Jung; Donghyouk Lim; Youngbin Seo; Yong-Gwan Lim; Jaemyoung Kim; Seung-Min Park


Archive | 2006

Method for reducing memory power consumption

Donghyouk Lim


Archive | 2007

Method and apparatus for transmitting contents with limited system permissions

Kanghee Kim; Yong-Gwan Lim; Yongbon Koo; Yung-Joon Jung; Jaemyoung Kim; Donghyouk Lim


Archive | 2013

TASK DISTRIBUTION METHOD AND APPARATUS FOR MULTI-CORE SYSTEM

Donghyouk Lim; Yung-Joon Jung; Dong-Hwan Son; Chaedeok Lim

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Yung-Joon Jung

Electronics and Telecommunications Research Institute

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Chaedeok Lim

Electronics and Telecommunications Research Institute

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Jaemyoung Kim

Electronics and Telecommunications Research Institute

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Euiseong Seo

Sungkyunkwan University

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Yong-Gwan Lim

Electronics and Telecommunications Research Institute

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Yongbon Koo

Electronics and Telecommunications Research Institute

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Dong-Sun Lim

Electronics and Telecommunications Research Institute

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Eun-Ser Lee

Andong National University

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Seung-Min Park

Electronics and Telecommunications Research Institute

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