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Compressed On-Chip Framebuffer Cache for Low-Power Display Systems
Baek, Donkyu,Chang, Naehyuck,Shin, Donghwa IEEE 2017 IEEE transactions on very large scale integration Vol.25 No.4
<P>A framebuffer memory is data storage for the displayed image, which is one of the major power consumers in display systems. This paper proposes a power reduction technique for the on-chip framebuffer cache (FBC) performing a compressed image data management. The proposed architecture stores the compressed image data in the on-chip FBC, and the display controller decompresses the image data on the fly and sends it to the liquid crystal display panel. The compression and decompression processes incur additional power consumption but achieve lower system-wide power consumption. We implement the proposed architecture in a field-programmable gate array platform to confirm power saving by actual measurement. Experiments demonstrate that the proposed on-chip FBC significantly reduces the number of the off-chip framebuffer memory accesses and saves a large portion of the system-wide power consumption accordingly.</P>
Kim, Jaemin,Baek, Donkyu,Ding, Caiwen,Lin, Sheng,Shin, Donghwa,Lin, Xue,Wang, Yanzhi,Cho, Young Hoo,Park, Sang Hyun,Chang, Naehyuck IEEE 2018 IEEE transactions on very large scale integration Vol.26 No.7
<P>Conventional internal combustion engine vehicles generally have less than a 30% of fuel efficiency, and the most wasted energy is dissipated in the form of heat energy. The excessive heat dissipation is a primary reason of poor fuel efficiency, but reclamation of the heat energy has not been a main focus of vehicle design. Thanks to thermoelectric generators (TEGs), wasted heat energy can be directly converted to electric energy. All the heat exchangers, including vehicle radiators, gradually cool down the coolant or gas from the inlet to outlet. TEG modules are commonly mounted throughout the heat exchanger to fulfill the required power density and voltage. Each TEG module has a different hot-side temperature by the mounting location (distance from the inlet) and thus different maximum power point (MPP) voltage and current. Nevertheless, TEG modules are commonly connected in series and parallel, where both the ends are connected to a single power converter. As a result, the whole TEG module array exhibits a significant efficiency degradation even if the power converter has the MPP tracking capability. Although material and device researchers have been putting a lot of effort in enhancing TEG efficiency, such system-level issue has not been deeply investigated. This paper proposes a cross-layer, system-level solution to enhance TEG array efficiency introducing online reconfiguration of TEG modules. The proposed method is useful for any sort of TEG arrays to reclaim wasted heat energy, because heat exchangers generally have different inlet and outlet temperature values. This paper also introduces a complete design and implementation showcase of a reconfigurable TEG module building block. Experimental results show up to a 34% enhancement using the proposed method compared with a fixed array structure, which is a common practice.</P>
Min Jung Jung,David Alrahwan,Esther Dubrovsky,Donghwa Baek,Alberto G. Ayala,Jae Y. Ro 한국유방암학회 2019 Journal of breast cancer Vol.22 No.2
Solitary fibrous tumor (SFT) is a rare, soft tissue neoplasm that rarely presents in breast tissue, with only 27 previously reported cases. To our knowledge, only one case of malignant SFT has been reported in the English literature. A 75-year-old Caucasian woman presented to our institution with a 3-month history of a palpable left breast mass. No other symptoms, including nipple discharge or skin changes, were noted. She underwent 3 previous biopsies for right breast masses, all of which were benign, with no evidence of spindle cell neoplasm, atypical hyperplasia, or malignancy. Microscopic examination of the mass demonstrated a classic area of SFT with areas of high-grade anaplastic component. In these areas, the tumor showed atypical epithelioid cells arranged in hypercellular sheets with diminished branching vasculature, nuclear pleomorphism, and increased mitotic count (up to 9/10 high-power fields). This case represents the second case of malignant SFT in the breast.
SORT와 DeepSORT의 혼합을 이용한 실시간 다중객체 추적
양수진(Sujin Yang),정인화(Inhwa Jung),강동화(Donghwa Kang),백형부(Hyeongboo Baek) 한국정보기술학회 2021 한국정보기술학회논문지 Vol.19 No.10
Deep Simple Online and Real-time Tracking(DeepSORT) is a multi-object tracking technology that improves the accuracy of SORT, and has the characteristic of using a feature map of Convolution Neural Network(CNN) when determining the relationship between objects between consecutive frames in SORT. This feature has the advantage of dramatically improving the accuracy, but has a disadvantage in that the frame per second(FPS) is lowered due to the large amount of additional computing operations required. Therefore, for real-time systems such as autonomous vehicles, SORT has been considered more suitable than deep SORT. In this paper, we propose a method of mixing SORT technology with DeepSORT to remove the shortcomings of the existing DeepSORT. As a result of the experiment targeting MOT-16, a widely used data set used for multi-object tracking performance, it was confirmed that the proposed method dramatically increased the FPS with little loss in accuracy.