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A Reconfigurable Lighting Engine for Mobile GPU Shaders
Ahn, Jonghun,Choi, Seongrim,Nam, Byeong-Gyu The Institute of Electronics and Information Engin 2015 Journal of semiconductor technology and science Vol.15 No.1
A reconfigurable lighting engine for widely used lighting models is proposed for low-power GPU shaders. Conventionally, lighting operations that involve many complex arithmetic operations were calculated by the shader programs on the GPU, which led to a significant energy overhead. In this letter, we propose a lighting engine to improve the energy-efficiency by supporting the widely used advanced lighting models in hardware. It supports the Blinn-Phong, Oren-Nayar, and Cook-Torrance models, by exploiting the logarithmic arithmetic and optimizing the trigonometric function evaluations for the energy-efficiency. Experimental results demonstrate 12.7%, 42.5%, and 35.5% reductions in terms of power-delay product from the shader program implementations for each lighting model. Moreover, our work shows 10.1% higher energy-efficiency for the Blinn-Phong model compared to the prior art.
A Reconfigurable Lighting Engine for Mobile GPU Shaders
Jonghun Ahn,Seongrim Choi,Byeong-Gyu Nam 대한전자공학회 2015 Journal of semiconductor technology and science Vol.15 No.1
A reconfigurable lighting engine for widely used lighting models is proposed for low-power GPU shaders. Conventionally, lighting operations that involve many complex arithmetic operations were calculated by the shader programs on the GPU, which led to a significant energy overhead. In this letter, we propose a lighting engine to improve the energy-efficiency by supporting the widely used advanced lighting models in hardware. It supports the Blinn-Phong, Oren-Nayar, and Cook-Torrance models, by exploiting the logarithmic arithmetic and optimizing the trigonometric function evaluations for the energy-efficiency. Experimental results demonstrate 12.7%, 42.5%, and 35.5% reductions in terms of power-delay product from the shader program implementations for each lighting model. Moreover, our work shows 10.1% higher energy-efficiency for the Blinn-Phong model compared to the prior art.
Analytic springback prediction in cylindrical tube bending for helical tube steam generator
Ahn, Kwanghyun,Lee, Kang-Heon,Lee, Jae-Seon,Won, Chanhee,Yoon, Jonghun Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.9
This paper newly proposes an efficient analytic springback prediction method to predict the final dimensions of bent cylindrical tubes for a helical tube steam generator in a small modular reactor. Three-dimensional bending procedure is treated as a two-dimensional in-plane bending procedure by integrating the Euler beam theory. To enhance the accuracy of the springback prediction, mathematical representations of flow stress and elastic modulus for unloading are systematically integrated into the analytic prediction model. This technique not only precisely predicts the final dimensions of the bent helical tube after a springback, but also effectively predicts the various target radii. Numerical validations were performed for five different radii of helical tube bending by comparing the final radius after a springback.
안광현(Kwanghyun Ahn),허훈(Hoon Huh),윤종헌(Jonghun Yoon) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
This paper is concerned with the effect of deformation twinning on the strain hardening in pure titanium. It is reported that the strain hardening of titanium during compressive deformation shows uncommon behavior. Generally, strain hardening rate of metallic materials is decreasing as strain increases. In accordance with many researches for titanium, however, strain hardening behavior of titanium shows different characteristics from general metallic materials. It is observed that the strain hardening rate of titanium during compression process can be divided into 3 stages. In first stage, strain hardening rate is decreasing as strain increases. Following first stage, strain hardening rate is increasing as strain increases in second stage. After second stage, strain hardening rate is decreasing again as strain increases in third stage. It is well known that the occurrence of the second stage is due to the occurrence of the deformation twinning. In this paper, the occurrence and the growth of the deformation twinning are observed using EBSD. Change of twin volume fraction during compressive deformation of titanium is investigated quantitatively. Strain hardening model which can represent the strain hardening of titanium is also suggested by investigating the effect of deformation twinning on the strain hardening behavior.
Energy-efficient static sparse-tree adder based on MUX-less bypassing architecture
Seongrim Choi,Jonghun Ahn,Kyungjin Byun,Byeong-Gyu Nam IET 2014 Electronics letters Vol.50 No.25
<P>An energy-efficient 64 bit static sparse-tree adder using a multiplexer (MUX)-less bypassing scheme is proposed for mobile central processing units. Conventionally, bypassing schemes have been used to eliminate unnecessary switching of circuits but have incorporated a large delay overhead due to their output MUX, which reduces the energy efficiency of circuits in terms of power-delay product (PDP). A novel static sparse-tree adder is presented based on a proposed MUX-less bypassing scheme to reduce the delay associated with the conventional bypassing scheme, thereby improving the energy efficiency, i.e. the PDP. Simulation results show a 30% reduction in PDP compared to the conventional bypassing adder and a 13% reduction from the state-of-the-art technique.</P>