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Jae-Ho Nah

Assistant Professor in the Department of Computer Science at Sangmyung University

I received my B.S., M.S., and Ph.D. degrees from Yonsei University.

Before joining Sangmyung University, I was a researcher at Sejong University, UNC Chapel Hill, and LG Electronics.

My research interests include various GPU techniques, such as real-time ray tracing, texture compression, etc.

If you are considering either a research collaboration with me or joining our lab, please feel free to contact me.

Selected Publications

RayCore: A Ray-Tracing Hardware Architecture for Mobile Devices

Jae-Ho Nah, Hyuck-Joo Kwon, Dong-Seok Kim, Cheol-Ho Jeong, Jinhong Park, Tack-Don Han, Dinesh Manocha, and Woo-Chan Park

ACM Transactions on Graphics (presented at ACM SIGGRAPH 2014), 33(5):162, 2014

PDF Slides Project

T&I Engine: Traversal and Intersection Engine for Hardware Accelerated Ray Tracing

Jae-Ho Nah, Jeong-Soo Park, Chanmin Park, Jin-Woo Kim, Yunhye Jung, Woo-Chan Park, and Tack-Don Han

ACM Transactions on Graphics (Proc. of ACM SIGGRAPH Asia 2011), 30(6):160, 2011

PDF Slides

L-Bench: An Android Benchmark Set for Low-power Mobile GPUs

Jae-Ho Nah, Youngsun Suh, and Yeongkyu Lim

Computers & Graphics, 61:40-49, 2016

PDF Video

HART: A Hybrid Architecture for Ray Tracing Animated Scenes

Jae-Ho Nah, Jin-Woo Kim, Junho Park, Won-Jong Lee, Jeong-Soo Park, Seok-Yoon Jung, Woo-Chan Park, Dinesh Manocha, and Tack-Don Han

IEEE Transactions on Visualization and Computer Graphics, 21(3):389-401, 2015

PDF Project

SATO: Surface-Area Traversal Order for Shadow Ray Tracing

Jae-Ho Nah and Dinesh Manocha

Computer Graphics Forum, 33(6):167-177, 2014

PDF Slides Project





Other Publications

(Journals)

Eunjae Kim, Juwon Yun, Woonam Chung, Jae-Ho Nah, Youngsik Kim, Cheoung Ghil Kim, Woo-Chan Park, "Effective Algorithm to Control Depth Level for Performance Improvement of Sound Tracing," Journal of Web Engineering, vol. 5, iss. 3, pp. 713–728, 2022. PDF

Jinyoung Lee, Jae-Ho Nah, Woo-Nam Chung, Tae-Hyoung Lee, and Woo-Chan Park, "An Implementation of Multi-Chip Architecture for Real-Time Ray Tracing based on Parallel Frame Rendering," IEEE Access, vol. 9, pp. 118968-118976, 2021. PDF

Jinyoung Lee, Woo-Nam Chung, Tae-Hyoung Lee, Jae-Ho Nah, Youngsik Kim, and Woo-Chan Park, "Load Balancing Algorithm for Real-Time Ray Tracing of Dynamic Scenes," IEEE Access, vol. 8, pp. 165003 - 165009, 2020. PDF

Juwon Yun, Jinyoung Lee, Cheong Ghil Kim, Yeong-Kyu Lim, Jae-Ho Nah, Youngsik Kim, Woo-Chan Park, "A Practically Applicable Performance Prediction Model based on Capabilities of Texture Mapping Units for Mobile GPUs," IEEE Access, vol. 7, pp. 102975-102984, 2019. PDF

Juwon Yun, Jinyoung Lee, Cheong Ghil Kim, Yeong-Kyu Lim, Jae-Ho Nah, Youngsik Kim, Woo-Chan Park, "A Novel Performance Prediction Model for Mobile GPUs," IEEE Access, vol. 6, pp. 16235-16245, 2018. PDF

Jae-Ho Nah, Yeongkyu Lim, Sunho Ki, and Chulho Shin, "Z2 Traversal Order: An Interleaving Approach for VR Stereo Rendering on Tile-based GPUs," Computational Visual Media, vol. 3, issue 4, pp. 349-357, Aug. 2017. (Invited from ACM SIGGRAPH Asia 2016 Technical Briefs).PDF

Youngwook Kim, Woong Seo, Yongho Kim, Yeongkyu Lim, Jae-Ho Nah, and Insung Ihm, "Adaptive Undersampling for Effective Mobile Ray Tracing," The Visual Computer (Special Issue of Computer Graphics International 2016), vol. 32, pp. 801-811, Jun. 2016. PDF

Dong-Seok Kim, Jae-Ho Nah, and Woo-Chan Park, "Geometry transition method to improve ray-tracing precision," Multimedia Tools and Applications, vol. 75, pp. 5689-5700, May. 2016. PDF

Hyuck-Joo Kwon, Jae-Ho Nah, Dinesh Manocha, and Woo-Chan Park, "Effective traversal algorithms and hardware architecture for pyramidal inverse displacement mapping," Computers & Graphics (Special Issue of CAD/GRAPHICS 2013), vol.38, pp. 140-149, Feb. 2014. PDF

Jae-Ho Nah, Woo-Chan Park, Yoon-Sig Kang, and Tack-Don Han, "Ray-Box Culling for Tree Structures," Journal of Information Science and Engineering, vol. 29, no. 6, pp.1211-1225, Nov. 2013. PDF

Jeong-soo Park, Woo-Chan Park, Jae-Ho Nah, and Tack-Don Han, "Node pre-fetching architecture for real-time ray tracing," IEICE Electronics Express, vol. 10, no. 14, pp.1-6, Jul. 2013.PDF

Yoon-Sig Kang, Jae-Ho Nah, Woo-Chan Park, and Sung-Bong Yang, "gkDtree: A Group-Based Parallel Update Kd-tree for Interactive Ray Tracing," Journal of Systems Architecture, vol. 59, no. 3, pp.166-175, Mar. 2013.PDF

Jae-Ho Nah, Yun-Hye Jung, Woo-Chan Park, and Tack-Don Han, "Efficient Ray Sorting for the Tracing of Incoherent Rays," IEICE Electronics Express, vol. 9, no. 9, pp.849-854, May 2012.PDF

(Conference Proceedings - Oral Presentations)

Jae-Ho Nah, "QuickETC2: How to Finish ETC2 Compression within 1 ms," ACM SIGGRAPH 2020 Talks, no. 4, Aug. 2020. PDF Slides

Jae-Ho Nah, Byeongjun Choi, and Yeongkyu Lim, "Classified Texture Resizing for Mobile Devices," ACM SIGGRAPH 2018 Talks, no. 73, Aug. 2018. PDF Slides

Jae-Ho Nah, Yeongkyu Lim, Sunho Ki, and Chulho Shin, "Z2 Traversal Order for VR Stereo Rendering on Tile-based Mobile GPUs," ACM SIGGRAPH Asia 2016 Technical Briefs, no. 6, Dec. 2016. PDF Slides

Won-Jong Lee, Youngsam Shin, Jaedon Lee, Jin-Woo Kim, Jae-Ho Nah, Seokyoon Jung, Shihwa Lee, Hyun-Sang Park, and Tack-Don Han, "SGRT: A Mobile GPU Architecture for Real-Time Ray Tracing," Proceedings of 5th High-Performance Graphics Conference, pp. 109-119, Jul. 2013. Project

Won-Jong Lee, Youngsam Shin, Jaedon Lee, Jin-Woo Kim, Jae-Ho Nah, Hyun-Sang Park, Seokyoon Jung, and Shihwa Lee, "A novel mobile GPU architecture based on ray tracing," Proceedings of 2013 IEEE International Conference on Consumer Electronics (ICCE), pp. 21-22, Jan. 2013.

Won-Jong Lee, Shi-Hwa Lee, Jae-Ho Nah, Jin-Woo Kim, Youngsam Shin, Jaedon Lee and Seok-Yoon Jung, "SGRT: A Scalable GPU Architecture based on Ray Tracing," ACM SIGGRAPH 2012 Talks, No. 2, Aug. 2012.

Jae-Ho Nah, Jeong-Soo Park, Jin-Woo Kim, Chanmin Park, and Tack-Don Han, "Ordered Depth-First Layouts for Ray Tracing," ACM SIGGRAPH Asia 2010 Sketches, No. 55, Dec. 2010. PDF Slides

Jae-Ho Nah, Yoon-Sig Kang, Kwang-Jo Lee, Shin-Jun Lee, Tack-Don Han, and Sung-Bong Yang, "MobiRT: An Implementation of OpenGL ES-Based CPU-GPU Hybrid Ray Tracer for Mobile Devices," ACM SIGGRAPH Asia 2010 Sketches, No. 50, Dec. 2010. PDF Slides Video

(Posters)

Jae-Ho Nah and Hyeju Kim, "TexSR: Image Super-Resolution for High-Quality Texture Mapping," ACM SIGGRAPH Asia 2022 Posters, no. 17, Dec. 2022. PDF Poster

Jae-Ho Nah, Sunho Ki, Yeongkyu Lim, Jinhong Park, and Chulho Shin, "AXAA: Adaptive approXimate Anti-Aliasing," ACM SIGGRAPH 2016 Posters, no. 51, Jul. 2016. PDF Comparison Images Poster Video Shader code

Sunho Ki, Jae-Ho Nah, Minkyu Kim, Youngduke Seo, Chulho Shin, and Jinhong Park, "Reusing MRTs for mobile GPUs," ACM SIGGRAPH Asia 2015 Posters, no. 44, Nov. 2015.

Jae-Ho Nah, Kyung-ho Lee, Woo-chan Park, and Tack-don Han, "A Shadow Culling Algorithm for Interactive Ray Tracing," Graphics Interface 2009 Posters, May 2009. (Best Poster Award) PDF Poster

Woo-Chan Park, Jinseok Hur, Dongseok Kim, Jae-Ho Nah, Jeongsu Park, Jinhong Park, and Tack-Don Han, "An Implementation of Ray Tracer on V5 FPGA," Proceedings of IEEE Symposium on Low-Power and High-Speed Chips (Cool Chips XII), Apr. 2009.

Jae-Ho Nah, Jin-suk Heo, Woo-chan Park, and Tack-don Han, "A Split Node Cache Scheme for Fast Ray Tracing," Proceedings of IEEE/EG Symposium on Interactive Ray Tracing 2008 (RT08), Aug. 2008. PDF

Woo-chan Park, Jae-Ho Nah, Jeong-soo Park, Kyung-ho Lee, Dong-seok Kim, Sang-duk Kim, Jin-hong Park, Yoon-sig Kang, Sung-bong Yang, and Tack-don Han, "An FPGA Implementation of Whitted-style Ray Tracing Accelerator," Proceedings of IEEE/EG Symposium on Interactive Ray Tracing 2008 (RT08), Aug. 2008.

Jinhong Park, Jae-Ho Nah, Kyungho Lee, Sangduk Kim, Yoon-Sig Kang, Sung-Bong Yang, Tack-Don Han and Woo-Chan Park, "An Implementation of Ray Tracing Core on FPGA," ACM SIGGRAPH Symposium on Interactive 3D Graphics and Games 2008 Poster (i3D 2008), Feb. 2008.

Il-San Kim, Jae-Ho Nah, and Tack-Don Han, "Transmission combining Arbiter for Multiple ROP units in 3D Graphics Accelerators," Proceedings of IEEE Symposium on Low-Power and High-Speed Chips (Cool Chips X), Apr. 2007.

Kyungho Lee, Sangduk Kim, Jae-Ho Nah, Yoon-sig Kang, Dongseok Kim, Sang-Won Ha, sung-Bong Yang, Tack-Don Han, and Woo-Chan Park, "A Framework for Real Time Ray Tracing," Proceedings of IEEE Symposium on Low-Power and High-Speed Chips (Cool Chips X), Apr. 2007.

(Domestic Papers)

Jae-Ho Nah, "ASTC Block-Size Determination Method based on PSNR Values," Journal of the Korea Computer Graphics Society, vol. 28, no. 2, Jun. 2022. PDF

Jae-Ho Nah, Woo-Chan Park, and Tack-Don Han, "A Shadow Culling Algorithm for Interactive Ray Tracing," Journal of Korea Game Society, vol. 9, no. 6, Dec. 2009. PDF

Disclaimer: Preprints and other materials in this webpage are provided for personal use only and not for distribution.