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Displaying 1-28 out of 28 total
Implementation of New Services to Support Ubiquitous Computing for Town Life
Found in: Software Technologies for Future Embedded and Ubiquitous Systems, IEEE Workshop on
By Tack-Don Han, Cheolho Cheong, Hyung-Min Yoon, Jong-Young Kim, Seong-Hun Jeong, Young-Seung Ryu, Bum-Seok Kang, Hyun-Kyung Kim, Seok-Won Lee, Vason P. Srini, Joo-Hyeon Lee, Young-Woo Sohn, Yoon Su Baek, Sang-Yong Lee, WooShik Kang, Seong Woon Kim
Issue Date:May 2005
pp. 45-49
The various services that make up the ubiquitous computing concept have developed with the rapid growth of wireless Internet environments and mobile devices. The major purpose of this research is to provide a context-aware U-Town environment to users by ut...
 
Implementation of New Services to Support Ubiquitous Computing for Campus Life
Found in: Software Technologies for Future Embedded and Ubiquitous Systems, IEEE Workshop on
By Tack-Don Han, Cheolho Cheong, Jae-Won Ahn, Jong-Young Kim, Hyung-Min Yoon, Chang-Su Lee, Hyon-Gu Shin, Young-Jin Lee, Hyoung-Min Yook, Myoung-Hoon Jeon, Jung Soo Choi, Joo-Hyeon Lee, Young-Woo Sohn, Yoon Su Baek, Sang-Yong Lee, Eun-Dong Shin, WooShik Kang,
Issue Date:May 2004
pp. 8
Many new services have emerged to realize ubiquitous computing environments, owing to the increasing supply of mobile devices and more widespread Internet and wireless network facilities. This paper introduces the U-Campus (Ubiquitous computing for Campus)...
 
A Scalable Work-Efficient and Depth-Optimal Parallel Scan for the GPGPU Environment
Found in: IEEE Transactions on Parallel and Distributed Systems
By Sang-Won Ha,Tack-Don Han
Issue Date:December 2013
pp. 2324-2333
The parallel scan is a basic tool that is used to parallelize algorithms which appear to have serial dependencies. The performance of these algorithms relies heavily on the efficiency of the parallel scan that is being used. To maintain work efficiency, cu...
 
An Effective Visibility Culling Method Based on Cache Block
Found in: IEEE Transactions on Computers
By Moon-Hee Choi, Woo-Chan Park, Francis Neelamkavil, Tack-Don Han, Shin-Dug Kim
Issue Date:August 2006
pp. 1024-1032
As the complexity of 3D scenes is on the increase, the search for an effective visibility culling method has become one of the most important issues to be addressed in the design of 3D rendering processors. In this paper, we propose a new rasterization pip...
 
A Cost-Effective Pipelined Divider with a Small Lookup Table
Found in: IEEE Transactions on Computers
By Jong-Chul Jeong, Woo-Chan Park, Woong Jeong, Tack-Don Han, Moon-Key Lee
Issue Date:April 2004
pp. 489-495
Current pipelinable dividers require very large lookup tables. We propose a cost-effective pipelinable divider that uses a modified Taylor-series expansion and has a smaller lookup table than other pipelinable dividers. The proposed divider requires about ...
 
An Effective Pixel Rasterization Pipeline Architecture for 3D Rendering Processors
Found in: IEEE Transactions on Computers
By Woo-Chan Park, Kil-Whan Lee, Il-San Kim, Tack-Don Han, Sung-Bong Yang
Issue Date:November 2003
pp. 1501-1508
<p><b>Abstract</b>—As a 3D scene becomes increasingly complex and the screen resolution increases, the design of an effective memory architecture is one of the most important issues for 3D rendering processors. We propose a pixel rasteriz...
 
A Mid-Texturing Pixel Rasterization Pipeline Architecture for 3D Rendering Processors
Found in: Application-Specific Systems, Architectures and Processors, IEEE International Conference on
By Woo-Chan Park, Kil-Whan Lee, Il-San Kim, Tack-Don Han, Sung-Bong Yang
Issue Date:July 2002
pp. 173
As a 3D scene becomes increasingly complex and the screen resolution increases, the design of effective memory architecture is one of the most important issues for 3D rendering processors. We propose a pixel rasterization architecture, which performs a dep...
 
In-Order Issue Out-of-Order Execution Floating-Point Coprocessor for CalmRISC32
Found in: Computer Arithmetic, IEEE Symposium on
By Cheol-Ho Jeong, Woo-Chan Park, Tack-Don Han, Moon-Key Lee, Sang-Woo Kim
Issue Date:June 2001
pp. 0195
Abstract: The CalmRISC32 FPU (Floating-Point Unit) is a RISC coprocessor for embedded system applications. It supports IEEE-754 standard single precision floating-point addition, floating-point subtraction, floating-point multiplication, floating-point div...
 
Adaptive Parallel System as the High Performance Parallel Architecture
Found in: High Performance Computing and Grid in Asia Pacific Region, International Conference on
By Jeong--Min Kim, Youngsik Kim, Shin--Dug Kim, Tack--Don Han, Sung--Bong Yang
Issue Date:May 1997
pp. 557
An approach for designing a hybrid parallel system that can be performed adaptively for different types of parallelism is presented. An adaptive parallel system (APS) is proposed to attain this goal. The APS is constructed by integrating tightly two differ...
 
Task scheduling in distributed computing systems with a genetic algorithm
Found in: High Performance Computing and Grid in Asia Pacific Region, International Conference on
By Sung-Ho Woo, Sung-Bong Yang, Shin-Dug Kim, Tack-Don Han
Issue Date:May 1997
pp. 301
Scheduling a directed acyclic graph (DAG) which represents the precedence relations of the tasks of a parallel program in a distributed computing system (DCS) is known as an NP-complete problem except for some special cases. Many heuristic-based methods ha...
 
Dynamic Load Balancing of Iterative Data Parallel Problems on a Workstation Clustering
Found in: High Performance Computing and Grid in Asia Pacific Region, International Conference on
By Hye-Seon Maeng, Hyoun-Su Lee, Tack-Don Han, Sung-Bong Yang, Shin-Duk Kim
Issue Date:May 1997
pp. 563
Dynamic load balancing on the workloads of the clustered workstations has emerged as a powerful solution for overcoming load imbalance. In order to detect such imbalances, some load balancing methods check the average idle-time of the workstations periodic...
 
Matrix Multiplications on the Memory_based Processor Array
Found in: High Performance Computing and Grid in Asia Pacific Region, International Conference on
By Mi--Jung Noh, Youngsik Kim, Tack--Don Han, Shin--Dug Kim, Sung--Bong Yang
Issue Date:May 1997
pp. 377
A memory_based processor array (MPA) for matrix multiplications is designed as an effective array architecture. Also a mapping algorithm to implement matrix multiplication on the MPA system is proposed. One outstanding feature of the MPA system is that it ...
 
An effective full-map directory scheme for the sectored caches
Found in: High Performance Computing and Grid in Asia Pacific Region, International Conference on
By Won-Kee Hong, Tack-Don Han, Shin-Dug Kim, Sung-Bong Yang
Issue Date:May 1997
pp. 7
In multiprocessor systems, the cache misses due to coherence transactions make up many of the total cache misses. However this type of cache miss is strongly dependent on the type of data sharing among processors, especially false sharing. Until now the sm...
 
An improved lookahead instruction prefetching
Found in: High Performance Computing and Grid in Asia Pacific Region, International Conference on
By Gi-Ho Park, Oh-Young Kwon, Tack-Don Han, Shin-Dug Kim, Sung-Bong Yang
Issue Date:May 1997
pp. 712
A new lookahead instruction prefetching mechanism is proposed in this paper. Though significant performance improvement can be obtained by improving both the cache miss ratio and average access time for successfully prefetched blocks, most conventional pre...
 
Reconfigurable Address Collector and Flying Cache Simulator
Found in: High Performance Computing and Grid in Asia Pacific Region, International Conference on
By Hyung-Min Yoon, Gi-Ho Park, Kil-Whan Lee, Tack-Don Han, Shin-Dug Kim, Sung-Bong Yang
Issue Date:May 1997
pp. 552
Trace-driven simulation is widely used to evaluate the cache memory system. The accuracy of the trace-driven simulation depends on the accuracy and length of the trace data. To achieve an accurate and long trace, trace collection hardware is designed. The ...
 
High performance RAID system by using dual head disk structure
Found in: High Performance Computing and Grid in Asia Pacific Region, International Conference on
By Nam-Kyu Lee, Tack-Don Han, Shin-Dug Kim, Sung-Bong Yang
Issue Date:May 1997
pp. 325
An approach for designing high performance disk array systems using a dual head disk structure is presented. In general, both I/O bandwidth and reliability can be significantly improved by using disk array systems, i.e., RAID. However, the performance of R...
 
Tag detection algorithm for improving the instability problem of an augmented reality
Found in: Mixed and Augmented Reality, IEEE / ACM International Symposium on
By Seok-won Lee, Dong-chul Kim, Do-yoon Kim, Tack-don Han
Issue Date:October 2006
pp. 257-258
No summary available.
 
An Effective Memory--Processor Integrated Architecture for Computer Vision
Found in: Parallel Processing, International Conference on
By Youngsik Kim, Tack-Don Han, Shin-Dug Kim, Sung-Bong Yang
Issue Date:August 1997
pp. 266
In this paper an effective memory-processor integrated architecture, called memory_based processor array (MPA), for computer vision is proposed. The MPA can be easily attached into any host system via memory interface. In order to measure the impact of the...
 
A Framework for Supporting Autonomous Navigation in Automobiles
Found in: Software Technologies for Future Embedded and Ubiquitous Systems, and International Workshop on Collaborative Computing, Integration, and Assurance, The IEEE Workshop on
By Emanuel TAROPA, Vason P. SRINI, Tack-Don HAN
Issue Date:April 2006
pp. 23-28
We describe a framework for designing and implementing autonomous navigation in automobiles. It integrates vehicle control, environment sensing, remote services, and navigation functions using mobile computing devices such as smartphones. We use wireless w...
 
AR pen and hand gestures: a new tool for pen drawings
Found in: CHI '13 Extended Abstracts on Human Factors in Computing Systems (CHI EA '13)
By Hark-Joon Kim, Hayoung Kim, Jonghoon Seo, Seungho Chae, Tack-Don Han
Issue Date:April 2013
pp. 943-948
This paper explores the interaction possibilities when artists use their non-dominant hand, while drawing with a pen in their dominant hand. We propose a new interactive AR-based pen tool which can overlay virtual images onto a physical drawing in real tim...
     
Parallel-pipeline-based traversal unit for hardware-accelerated ray tracing
Found in: SIGGRAPH Asia 2012 Posters (SA '12)
By Jin-Woo Kim, Min-Woo Lee, Tack-Don Han, Won-Jong Lee
Issue Date:November 2012
pp. 1-1
In this work, we propose a novel parallel-pipeline traversal unit for hardware-based ray tracing, which can reduce latency and increase cache locality. Owing to the high memory bandwidth and computation requirements of ray-tracing operations such as traver...
     
Ambient Wall: Smart Wall Display interface which can be controlled by simple gesture for smart home
Found in: SIGGRAPH Asia 2011 Sketches (SA '11)
By Hark-Joon Kim, Kyung-Ho Jeong, Seon-Kyo Kim, Tack-Don Han
Issue Date:December 2011
pp. 1-2
The residential environment is getting smarter, and home appliances have become connected each other automatically. Accordingly, user interface also has become increasingly complicated. In this paper, we found the main causes of making the users uncomforta...
     
T&I engine: traversal and intersection engine for hardware accelerated ray tracing
Found in: ACM Transactions on Graphics (TOG)
By Chanmin Park, Jae-Ho Nah, Jeong-Soo Park, Jin-Woo Kim, Tack-Don Han, Woo-Chan Park, Yun-Hye Jung
Issue Date:December 2011
pp. 1-15
Ray tracing naturally supports high-quality global illumination effects, but it is computationally costly. Traversal and intersection operations dominate the computation of ray tracing. To accelerate these two operations, we propose a hardware architecture...
     
T&I engine: traversal and intersection engine for hardware accelerated ray tracing
Found in: Proceedings of the 2011 SIGGRAPH Asia Conference (SA '11)
By Chanmin Park, Jae-Ho Nah, Jeong-Soo Park, Jin-Woo Kim, Tack-Don Han, Woo-Chan Park, Yun-Hye Jung
Issue Date:December 2011
pp. 1-137
Ray tracing naturally supports high-quality global illumination effects, but it is computationally costly. Traversal and intersection operations dominate the computation of ray tracing. To accelerate these two operations, we propose a hardware architecture...
     
T&I engine: traversal and intersection engine for hardware accelerated ray tracing
Found in: Proceedings of the 2011 SIGGRAPH Asia Conference (SA '11)
By Chanmin Park, Jae-Ho Nah, Jeong-Soo Park, Jin-Woo Kim, Tack-Don Han, Woo-Chan Park, Yun-Hye Jung
Issue Date:December 2011
pp. 1-10
Ray tracing naturally supports high-quality global illumination effects, but it is computationally costly. Traversal and intersection operations dominate the computation of ray tracing. To accelerate these two operations, we propose a hardware architecture...
     
The development of a detection system for seniors' accidental fall from bed using cameras
Found in: Proceedings of the 5th International Confernece on Ubiquitous Information Management and Communication (ICUIMC '11)
By Jinwook Shim, Myung-hoon Shim, Tack-don Han, Yoon-su Baek
Issue Date:February 2011
pp. 1-4
For many seniors, patients, and vulnerable people, an accidental fall could bear consequences serious enough to be life-threatening. Accordingly, increasing expenditure on the prevention of accidental fall has been a trend in the developed countries. One o...
     
Ordered depth-first layouts for ray tracing
Found in: ACM SIGGRAPH ASIA 2010 Sketches (SA '10)
By Chanmin Park, Jae-Ho Nah, Jeong-Soo Park, Jin-Woo Kim, Tack-Don Han
Issue Date:December 2010
pp. 1-2
We present an ordered depth-first tree layout for ray tracing. Among two child nodes, a child node with the larger surface area is stored next to its parent node. Hence, the probabilities that a ray accesses to the same cache line increase. Our approach ca...
     
MobiRT: an implementation of OpenGL ES-based CPU-GPU hybrid ray tracer for mobile devices
Found in: ACM SIGGRAPH ASIA 2010 Sketches (SA '10)
By Jae-Ho Nah, Kwang-Jo Lee, Shin-Jun Lee, Sung-Bong Yang, Tack-Don Han, Yoon-Sig Kang
Issue Date:December 2010
pp. 1-2
Three-dimensional user interfaces on mobile devices are increasingly important. For more realistic three-dimensional visualization on mobile devices, we present the implementation of an OpenGL ES-based CPU-GPU hybrid ray tracer. This ray tracer exploits th...
     
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