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Displaying 1-50 out of 60 total
Model Validation of a Wormhole Router System
Found in: High Performance Computing and Grid in Asia Pacific Region, International Conference on
By Ho Sik Jang, Bong Wan Kim, Kyu-Hyun Shim, Kyu Ho Park
Issue Date:May 1997
pp. 740
In this paper, we perform model validation of a wormhole router system. Our simulation model is calibrated through measurement of our real wormhole router system. The average latency of real system output is in the 95% confidence interval of our simulation...
 
Resource Management of Manycores with a Hierarchical and a Hybrid Main Memory for MN-MATE Cloud Node
Found in: 2012 IEEE World Congress on Services (SERVICES)
By Kyu Ho Park,Sung Kyu Park,Woomin Hwang,Hyunchul Seok,Dong-Jae Shin,Ki-Woong Park
Issue Date:June 2012
pp. 301-308
The advent of manycore in computing architecture causes severe energy consumption and memory wall problem. Emerging technologies such as on-chip DRAM and nonvolatile memory (NVRAM) receive attention as promising solutions for them. Nonvolatile memory is a ...
 
THEMIS: Towards Mutually Verifiable Billing Transactions in the Cloud Computing Environment
Found in: Cloud Computing, IEEE International Conference on
By Ki-Woong Park, Sung Kyu Park, Jaesun Han, Kyu Ho Park
Issue Date:July 2010
pp. 139-147
The ability to record and keep account of the usage of cloud resources in a credible and verifiable way is a precursor to widespread cloud deployment and availability because usage information is potentially sensitive and must be verifiably accurate. In an...
 
MNK: Configurable Hybrid Flash Translation Layer for Multi-Channel SSD
Found in: 2012 IEEE 15th International Conference on Computational Science and Engineering (CSE)
By Gyudong Shim,Sung Kyu Park,Kyu Ho Park
Issue Date:December 2012
pp. 445-452
For multi-channel Solid State Disks (SSDs), hybrid Flash Translation Layer (FTL) schemes were developed for increasing I/O parallelism and reducing garbage collection overhead. However, they still suffer from the high read and write latency, block thrashin...
 
A Ubiquitous Fashionable Computer with an i-Throw Device on a Location-Based Service Environment
Found in: Advanced Information Networking and Applications Workshops, International Conference on
By Jupyung Lee, Seung-Ho Lim, Jong-Woon Yoo, Ki-Woong Park, Hyun-Jin Choi, Kyu Ho Park
Issue Date:May 2007
pp. 59-65
The ubiquitous fashionable computer(UFC), introduced in this paper, is a wearable computer that allows people to exploit ubiquitous computing environment in a user-friendly manner. We present the design approach and philosophy of the UFC that is wearable, ...
 
Scrap: Data Reorganization and Placement of Two Dimensional Scalable Video in a Disk Array-Based Video Server
Found in: Multimedia Workshops, International Symposium on
By Seung-Ho Lim, Man-Keun Seo, Kyu Ho Park
Issue Date:December 2007
pp. 161-166
In this paper, we propose an efficient data reorgani- zation and placement for two dimensional scalable video in a disk array-based video server. In the scalable video coding (SVC), multi-dimensional scalability aspects are implemented, accordingly, all ty...
 
An Efficient NAND Flash File System for Flash Memory Storage
Found in: IEEE Transactions on Computers
By Seung-Ho Lim, Kyu-Ho Park
Issue Date:July 2006
pp. 906-912
In this paper, we present an efficient flash file system for flash memory storage. Flash memory, especially NAND flash memory, has become a major method for data storage. Currently, a block level translation interface is required between an existing file s...
 
MN-Mate: Resource Management of Manycores with DRAM and Nonvolatile Memories
Found in: High Performance Computing and Communications, 10th IEEE International Conference on
By Kyu Ho Park, Youngwoo Park, Woomin Hwang, Ki-Woong Park
Issue Date:September 2010
pp. 24-34
The advent of many core era breaks the performance wall but it causes severe energy consumption. NVRAM as a main memory can be a good solution to reduce energy consumption due to large size of DRAM. In this paper, we propose MN-MATE, a novel architecture a...
 
HyperDealer: Reference-Pattern-Aware Instant Memory Balancing for Consolidated Virtual Machines
Found in: Cloud Computing, IEEE International Conference on
By Woomin Hwang, Yangwoo Roh, Youngwoo Park, Ki-Woong Park, Kyu Ho Park
Issue Date:July 2010
pp. 426-434
Memory contention among consolidated virtual machines (VMs) creates the need for a memory balancing operation. In an attempt to provide a prompt memory balancing mechanism, we found problems with the retardation of memory transfer by the reclamation delay....
 
MetaCore: An Application Specific DSP Development System
Found in: Design Automation Conference
By Hyun-Dhong Yoon, In-Cheol Park, In-Hyung Kim, Jae-Yeol Kim, Jang-Ho Cho, Jong-Sun Kim, Jong-Yeol Lee, Jun-Sung Kim, Kun-Moo Lee, Kwang-11 Park, Kyu-Ho Park, Sang-Jun Nam, Seung-Hoon Hwang, Sung-won Seo, Yong-Hoon Lee, Young-Su Kwon, Byoung-Woon Kim, Chan-S
Issue Date:June 1998
pp. 800-803
This paper describes the MetaCore system which is an ASIP (Application-Specific Instruction set Processor) development system targeted for DSP applications. The goal of MetaCore system is to offer an efficient design methodology meeting specifications give...
 
THEMIS: A Mutually Verifiable Billing System for the Cloud Computing Environment
Found in: IEEE Transactions on Services Computing
By Ki-Woong Park,Jaesun Han,JaeWoong Chung,Kyu Ho Park
Issue Date:July 2013
pp. 300-313
With the widespread adoption of cloud computing, the ability to record and account for the usage of cloud resources in a credible and verifiable way has become critical for cloud service providers and users alike. The success of such a billing system depen...
 
OPAMP: Evaluation Framework for Optimal Page Allocation of Hybrid Main Memory Architecture
Found in: 2012 IEEE 18th International Conference on Parallel and Distributed Systems (ICPADS)
By Jong-Hun Choi,Seong-Min Kim,Chulmin Kim,Ki-Woomg Park,Kyu Ho Park
Issue Date:December 2012
pp. 620-627
Main memory as a hybrid between DRAM and nonvolatile memory is rapidly considered as a basic building block of computing systems. Despite widely-performed researches no one can confirm whether hybrid memory is at its full performance in terms of energy con...
 
MN-GEMS: A Timing-Aware Simulator for a Cloud Node with Manycore, DRAM, and Non-volatile Memories
Found in: Cloud Computing, IEEE International Conference on
By Woomin Hwang,Ki-Woong Park,Kyu Ho Park
Issue Date:July 2011
pp. 734-735
In this paper, we describe a part of our on-going research project aimed at the management of many core and Hybrid Main Memory with DRAM and Non-Volatile RAMs (NVRAMs).By the needs of simulation and through investigation of the requirements for the target ...
 
BLAST: Applying Streaming Ciphers Into Outsourced Cloud Storage
Found in: Parallel and Distributed Systems, International Conference on
By Ki-Woong Park, Chulmin Kim, Kyu Ho Park
Issue Date:December 2010
pp. 431-437
Providing secure and efficient outsourced storage is a precursor to widespread cloud deployment and availability. For this purpose, existing designs mainly rely on block ciphers, although stream ciphers are more computationally-efficient than block ciphers...
 
FalconEye: Data Center Status Extraction via Vision Transformation Techniques
Found in: Computer Software and Applications Conference Workshops
By Ki-Woong Park, Woomin Hwang, Kyu Ho Park
Issue Date:July 2010
pp. 388-392
In this study, a vision monitoring system that is applicable to the maintenance of data centers was developed and applied to data center status extraction. The vision monitoring system, which is intended to complement system monitoring tools, such as IPMI ...
 
High-Performance Scalable Flash File System Using Virtual Metadata Storage with Phase-Change RAM
Found in: IEEE Transactions on Computers
By Youngwoo Park, Kyu Ho Park
Issue Date:March 2011
pp. 321-334
Several flash file systems have been developed based on the physical characteristics of NAND flash memory. However, previous flash file systems have performance overhead and scalability problems caused by metadata management in NAND flash memory. In this p...
 
Computationally Efficient PKI-Based Single Sign-On Protocol, PKASSO for Mobile Devices
Found in: IEEE Transactions on Computers
By Ki-Woong Park, Sang Seok Lim, Kyu Ho Park
Issue Date:June 2008
pp. 821-834
In an attempt to expand Public Key Infrastructure (PKI) usage to a ubiquitous and mobile computing environment, we found that the deployment of the PKI on a resource constrained device leads to user-obstructive latency or an additional circuitry for the op...
 
pKASSO: Towards Seamless Authentication Providing Non-Repudiation on Resource-Constrained Devices
Found in: Advanced Information Networking and Applications Workshops, International Conference on
By Ki-Woong Park, Hyunchul Seok, Kyu-Ho Park
Issue Date:May 2007
pp. 105-112
PKI is generally considered as the most appropriate solution for e-commerce and mutual authentication, owing to its digital signature and non-repudiation features. Asymmetric key operations of PKI require by far more CPU cycles than a symmetric cryptograph...
 
A Bandwidth-Efficient Implementation of Mesh with Multiple Broadcasting
Found in: Parallel Processing, International Conference on
By Jong Hyuk Choi, Bong Wan Kim, Kyu Ho Park, Kwang-Il Park
Issue Date:September 1999
pp. 434
This paper presents a mesh with virtual buses as the bandwidth-efficient implementation of the mesh with multiple broadcasting on which many computational problems can be solved with reduced time complexity. The new system provides a low latency and high b...
 
Moving Home-Based Lazy Release Consistency for Shared Virtual Memory Systems
Found in: Parallel Processing, International Conference on
By Jae Woong Chung, Byeong Hag Seong, Kyu Ho Park, Daeyeon Park
Issue Date:September 1999
pp. 282
While Shared Virtual Memory is a cost-effective way to provide an illusion of shared memory to programmers, the performance of the system is limited by its inherent overheads. Several protocols such as Lazy Release Consistency (LRC) and Home-based LRC(HLRC...
 
Events suppression technique for high performance VHDL simulation
Found in: High Performance Computing and Grid in Asia Pacific Region, International Conference on
By Kwang Il Park, Kyu Ho Park
Issue Date:May 1997
pp. 431
The performance and efficiency of event driven simulations, such as VHDL and Verilog simulation, depend on the number of events that occur during the simulation. We classify events into two categories, sensitive events and insensitive events, according to ...
 
The Acceleration of VHDL Simulation by Classifying Events
Found in: Simulation Symposium, Annual
By Kwang II Park, Jun Sung Kim, Heung Bum Kim, Jong Hyuk Choi, Kyu Ho Park
Issue Date:April 1997
pp. 177
The performance and efficiency of event-driven simulations, such as VHDL and Verilog simulation, depend on the number of events that occur during the simulation. In this paper, we classify events into two categories, sensitive events and insensitive events...
 
Tiled QR Decomposition and Its Optimization on CPU and GPU Computing System
Found in: 2013 42nd International Conference on Parallel Processing (ICPP)
By Dongjin Kim, Kyu-Ho Park
Issue Date:October 2013
pp. 744-753
There can be many types of heterogeneous computing systems, and the most useful one is the CPU and GPU computing system. In this system, we try to run QR decomposition, which expresses a standard real matrix as a production of two matrices. For a tiled QR ...
 
R-Barrier: Rapid Barrier for Software RAID Cache Using Hints from Journaling Filesystem
Found in: 2012 IEEE 18th International Conference on Parallel and Distributed Systems (ICPADS)
By Chulmin Kim,Sung Hoon Baek,Kyu Ho Park
Issue Date:December 2012
pp. 722-723
While adopting cache in software RAID brings performance benefit, it can cause data loss at power failure which results in the broken filesystem consistency. Though I/O Barrier can be used to remove the consistency issue, it sacrifices the write performanc...
 
A Cooperative Clustering Protocol for Energy Saving of Mobile Devices with WLAN and Bluetooth Interfaces
Found in: IEEE Transactions on Mobile Computing
By Jong-Woon Yoo, Kyu Ho Park
Issue Date:April 2011
pp. 491-504
One of the most widely used wireless communication standards is a Wireless Local Area Network (WLAN) (IEEE 802.11). However, WLAN has a serious power consumption problem. In this paper, we propose a novel energy saving approach that exploits the multiradio...
 
Striping-Aware Sequential Prefetching for Independency and Parallelism in Disk Arrays with Concurrent Accesses
Found in: IEEE Transactions on Computers
By Sung Hoon Baek, Kyu Ho Park
Issue Date:August 2009
pp. 1146-1152
Traditional studies on disk arrays have focused on parallelism or load balance of disks. However, this paper reveals that the independency of disks is more important than parallelism for concurrent reads of large numbers of processes in striped disk arrays...
 
Facial color control to represent character emotion
Found in: Computers in Education, International Conference on
By Kyu Ho Park, Tae Yong Kim
Issue Date:January 2009
pp. 1-2
We developed a facial color change technique, which is a combination of emotional models based on human cultural theory, emotional expression pattern using colors, and emotional reaction speed function, as opposed to previous methods that express emotions ...
 
Prediction-Based Micro-Scheduler: Toward Responsive Scheduling of General-Purpose Operating Systems
Found in: IEEE Transactions on Computers
By Jupyung Lee, Kyu Ho Park
Issue Date:May 2009
pp. 648-661
In this paper, we propose a novel scheduling technique to improve the responsiveness of a real-time process while maintaining relative execution rates of non-real-time processes, called the prediction-based micro-scheduler. It runs upon an existing macro-s...
 
A Hybrid Flash File System Based on NOR and NAND Flash Memories for Embedded Devices
Found in: IEEE Transactions on Computers
By Chul Lee, Sung Hoon Baek, Kyu Ho Park
Issue Date:July 2008
pp. 1002-1008
This paper presents a hybrid flash file system (HFFS) based on both NOR flash and NAND flash memory. In a conventional NAND flash-based flash file system, there is a trade-off between life span and durability in the frequent writing of small amounts of dat...
 
Matrix-Stripe-Cache-Based Contiguity Transform for Fragmented Writes in RAID-5
Found in: IEEE Transactions on Computers
By Sung Hoon Baek, Kyu Ho Park
Issue Date:August 2007
pp. 1040-1054
<p><b>Abstract</b>—Given that contiguous reads and writes between a cache and a disk outperform fragmented reads and writes, fragmented reads and writes are forcefully transformed into contiguous reads and writes via a proposed matrix-str...
 
Matrix Stripe Cache-Based Contiguity Transform for Fragmented Writes in RAID-5
Found in: IEEE Transactions on Computers
By Sung Hoon Baek,Kyu Ho Park
Publication Date: June 2007
pp. N/A
Given that contiguous reads and writes between a cache and a disk outperform fragmented reads and writes, fragmented reads and writes are forcefully transformed into contiguous reads and writes via a proposed matrix stripe cachebased contiguity transform (...
 
TPF: TCP Plugged File System for Efficient Data Delivery over TCP
Found in: IEEE Transactions on Computers
By Sang Seok Lim, Kyu Ho Park
Issue Date:April 2007
pp. 459-473
Most Internet services, including Web, FTP, and streaming, have been realized on top of TCP, which is the de facto protocol for data delivery over the Internet. Therefore, in order to achieve high-performance data delivery over TCP, we thoroughly analyze T...
 
Game Character?s Active Facial Color Engine based on the Theory of Emotion-Color Association
Found in: Hybrid Information Technology, International Conference on
By Kyu-Ho Park, Kyoung-Nam Kim, Nam-Keum Doh, Tae-Yong Kim
Issue Date:November 2006
pp. 751-757
<p>The graphical expressions and artificial intelligence of Characters have been continuously improving, spurred by the astonishing growth of the game technology industry. Despite such improvements, users are still demanding a more natural gaming env...
 
A New Joint Source-Channel Modeling Approach for Adaptive FEC Code Rate Decision
Found in: Multimedia and Expo, IEEE International Conference on
By Yo-won Jeong, Jae Kwon, Jae-kyoon Kim, Kyu-ho Park
Issue Date:July 2006
pp. 1433-1436
We propose a joint source-channel modeling approach for adaptively determining the quality-optimal FEC code rate. Our objective is to obtain the optimal video quality in the receiver, while taking time-varying packet loss into consideration. First, we defi...
 
Delayed Locking Technique for Improving Real-Time Performance of Embedded Linux by Prediction of Timer Interrupt
Found in: Real-Time and Embedded Technology and Applications Symposium, IEEE
By Jupyung Lee, Kyu-Ho Park
Issue Date:March 2005
pp. 487-496
In this paper, we propose a new technique, called a delayed locking technique, to improve the real-time performance of embedded Linux. The proposed technique employs the rule that entering a critical section is allowed only if the operation does not distur...
 
A Parallel Programming Environment for a V-Busbased PC-cluster
Found in: Cluster Computing, IEEE International Conference on
By Sang Seok Lim, Yunheung Paek, Kyu Ho Park, Jay Hoeflinger
Issue Date:October 2001
pp. 235
Nowadays PC-cluster architectures are widely accepted forparallel computing.In a PC-cluster system, memories are physicallydistributed.To harness thecomputational power of a distributed-memoryPC-cluster, a user must writeefficient software for the machine ...
 
Unified Modeling Graph for Specifying and Synthesizing Chip-Level Interfaces
Found in: EUROMICRO Conference
By Young Moo Lee, Kyu Ho Park
Issue Date:September 1999
pp. 1388
This paper presents a new method for specifying chip-level interfaces, named the unified modeling graph(UMG). The UMG firstly combines the features of both the finite state machine(FSM) and the signal transition graph(STG) to achieve a unified representati...
 
Segment Directory Enhancing the Limited Directory Cache Coherence Schemes
Found in: Parallel Processing Symposium, International
By Jong Hyuk Choi, Kyu Ho Park
Issue Date:April 1999
pp. 258
We present a new arrangement of directory bits called the segment directory to improve directory storage efficiency: a segment directory can point to several sharing processors with almost the same number of bits as the pointer which can point to only one....
 
Fast Volume Rendering using Adaptive Block Subdivision
Found in: Computer Graphics and Applications, Pacific Conference on
By Choong Hwan Lee, Kyu Ho Park
Issue Date:October 1997
pp. 148
Korea Advanced Institute of Science and TechnologyThis paper proposes a fast volume rendering scheme that greatly reduces ray-casting overheads by an adaptive block subdivision. We first apply a uniform space subdivision for constructing the adaptively sub...
 
A concurrency preserving partitioning algorithm for parallel simulation of hierarchical, modular discrete event models
Found in: High Performance Computing and Grid in Asia Pacific Region, International Conference on
By Ki Hyung Kim, Tag Con Kim, Kyu Ho Park
Issue Date:May 1997
pp. 204
The paper presents a concurrency preserving partitioning algorithm for the optimistic parallel simulation of hierarchical, modular discrete event models. The proposed algorithm pursues the following three goals to achieve the overall objective of a minimum...
 
Hybrid Full Map Directory Scheme for Distributed Shared Memory Multiprocessors
Found in: High Performance Computing and Grid in Asia Pacific Region, International Conference on
By Jong Hyuk Choi, Kyu Ho Park
Issue Date:May 1997
pp. 30
In this paper, a novel full map directory cache coherence scheme called the hybrid full map directory scheme is proposed. It reduces the growth rate of the directory storage overhead from O(N^2) down to O(N \sqrt N).Moreover, the performance of the scheme ...
 
Adaptive wear-leveling algorithm for PRAM main memory with a DRAM buffer
Found in: ACM Transactions on Embedded Computing Systems (TECS)
By Ki-Woong Park, Kyu Ho Park, Min Kyu Maeng, Sung Kyu Park
Issue Date:February 2014
pp. 1-25
Phase Change RAM (PRAM) is a candidate to replace DRAM main memory due to its low idle power consumption and high scalability. However, its latency and endurance have generated problems in fulfilling its main memory role. The latency can be treated with a ...
     
MetaCore: an application specific DSP development system
Found in: Proceedings of the 35th annual conference on Design automation conference (DAC '98)
By Byoung-Woon Kim, Chan-Soo Hwang, Chang-Ho Ryu, Chong-Min Kyung, Dae-Hyun Lee, Hyun-Dhong Yoon, In-Cheol Park, In-Hyung Kim, Jae-Yeol Kim, Jang-Ho Cho, Jin-Hyuk Yang, Jong-Sun Kim, Jong-Yeol Lee, Jun-Sung Kim, Kun-Moo Lee, Kwang-11 Park, Kyu-Ho Park, Sang-Jun Nam, Seung-Hoon Hwang, Sung-won Seo, Yong-Hoon Lee, Young-Su Kwon
Issue Date:June 1998
pp. 800-803
This paper describes the MetaCore system which is an ASIP (Application-Specific Instruction set Processor) development system targeted for DSP applications. The goal of MetaCore system is to offer an efficient design methodology meeting specifications give...
     
Reference Pattern-Aware Instant Memory Balancing for Consolidated Virtual Machines on Manycores
Found in: IEEE Transactions on Parallel and Distributed Systems
By Woomin Hwang,Ki-Woong Park,Kyu Ho Park
Issue Date:August 2014
pp. 1
Memory contention among consolidated VMs on the same hardware has created the need for repetitive memory balancing operations. In an attempt to provide a prompt memory balancing mechanism, we found problems with the retardation of memory reallocation by th...
 
Efficient memory management of a hierarchical and a hybrid main memory for MN-MATE platform
Found in: Proceedings of the 2012 International Workshop on Programming Models and Applications for Multicores and Manycores (PMAM '12)
By Dong-Jae Shin, Jong Hun Choi, Kyu Ho Park, Sung Kyu Park, Hyunchul Seok, Ki-Woong Park, Woomin Hwang
Issue Date:February 2012
pp. 83-92
The advent of manycore in computing architecture causes severe energy consumption and memory wall problem. Thus, emerging technologies such as on-chip memory and nonvolatile memory (NVRAM) have led to a paradigm shift in computing architecture era. For ins...
     
CAVE: channel-aware buffer management scheme for solid state disk
Found in: Proceedings of the 2011 ACM Symposium on Applied Computing (SAC '11)
By Gyudong Shim, Kyu Ho Park, Sung Kyu Park, Youngwoo Park
Issue Date:March 2011
pp. 346-353
Exploiting a multi-channel architecture of Solid State Disk (SSD) is a role of Flash Translation Layer (FTL) until now. A multi-channel FTL scheme increases I/O parallelism by spreading out pages in a logical block to multiple channels. However, this schem...
     
Credit-based Runtime Placement of Virtual Machines on a Single NUMA System for QoS of Data Access Performance
Found in: IEEE Transactions on Computers
By Chulmin Kim,Kyu Ho Park
Issue Date:June 2014
pp. 1
While a NUMA system is being widely used as a target machine for virtualization, each data access request produced by a virtual machine (VM) on the NUMA system may have a different access time depending on not only remote access condition, but also shared ...
 
DNS: Disk-to-Network Splicing for Network Driven Data Transferring
Found in: Applications and the Internet, IEEE/IPSJ International Symposium on
By Sang Seok Lim, Kyu Ho Park
Issue Date:January 2004
pp. 219
In Internet servers that run on general-purpose operating systems, network subsystems and disk subsystems cooperate with each other for user requests. Many studies have focused on optimizing the data movement across the subsystems to reduce data copying ov...
 
An Adaptive Admission Control Mechanism for a Cluster-Based Web Server System
Found in: Parallel and Distributed Processing Symposium, International
By Sang Seok Lim, Chul Lee, Chul Woo Ahn, Chang Gyu Lee, Kyu Ho Park
Issue Date:April 2002
pp. 0223b
For QoS, we propose a new admission control mechanism called Q-PID, with which a web server system provides an user with satisfactory service by guaranteeing the bounded and predictive response time. The Q-PID controller is based on a feedback method that ...
 
PFFS: a scalable flash memory file system for the hybrid architecture of phase-change RAM and NAND flash
Found in: Proceedings of the 2008 ACM symposium on Applied computing (SAC '08)
By Chul Lee, Kyu Ho Park, Seung-Ho Lim, Youngwoo Park
Issue Date:March 2008
pp. 28-34
In this paper, we present the scalable and efficient flash file system using the combination of NAND and Phase-change RAM (PRAM). Until now, several flash file systems have been developed considering the physical characteristics of NAND flash. However, pre...
     
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