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A DSP Architecture for High-Speed FFT in OFDM Systems
JaesungLee,JeonghooLee,MyungH.Sunwoo,SangmanMoh,SeongKeunOh 한국전자통신연구원 2002 ETRI Journal Vol.24 No.5
This paper presents digital signal processor (DSP) instructions and their data processing unit (DPU) architecture for high-speed fast Fourier transforms (FFTs) in orthogonal frequency division multiplexing (OFDM) systems. The proposed instructions jointly perform new operation flows that are more efficient than the operation flow of the multiply and accumulate (MAC) instruction on which existing DSP chips heavily depend. We further propose a DPU architecture that fully supports the instructions and show that the architecture is two times faster than existing DSP chips for FFTs. We simulated the proposed model with a Verilog HDL, performed a logic synthesis using the 0.35 mm standard cell library, and then verified the functions thoroughly.
A Bus Data Compression Method on a Phase-Based On-Chip Bus
Jaesung Lee 대한전자공학회 2012 Journal of semiconductor technology and science Vol.12 No.2
This paper provides a method for compression transmission of on-chip bus data. As the data traffic on on-chip buses is rapidly increasing with enlarged video resolutions, many video processor chips suffer from a lack of bus bandwidth and their IP cores have to wait for a longer time to get a bus grant. In multimedia data such as images and video, the adjacent data signals very often have little or no difference between them. Taking advantage of this point, this paper develops a simple bus data compression method to improve the chip performance and presents its hardware implementation. The method is applied to a Video Codec - 1 (VC-1) decoder chip and reduces the processing time of one macro-block by 13.6% and 10.3% for SD and HD videos, respectively
Jae Sung Lee,Seongjae Cho,Byung-Gook Park,James S. Harris,In Man Kang 대한전자공학회 2012 Journal of semiconductor technology and science Vol.12 No.2
In this paper, we present the radiofrequency (RF) modeling for gate-all-around (GAA) junctionless (JL) MOSFETs with 30-㎚ channel length. The presented non-quasi-static (NQS) model has included the gate-bias-dependent components of the source and drain (S/D) resistances. RF characteristics of GAA junctionless MOSFETs have been obtained by 3-dimensional (3D) device simulation up to 1 ㎔. The modeling results were verified under bias conditions of linear region (VGS = 1 V, VDS = 0.5 V) and saturation region (VGS = VDS = 1 V). Under these conditions, the root-mean-square (RMS) modeling error of Y₂₂-parameters was calculated to be below 2.4%, which was reduced from a previous NQS modeling error of 10.2%.
Carnot Efficiency and Zero-Entropy Production Rate Do Not Guarantee Reversibility of a Process
Jae Sung Lee,이상훈,엄재곤,박형규 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.75 No.12
A thermodynamic process at a zero-entropy production (EP) rate has been regarded as a reversible process. A process achieving the Carnot efficiency is also considered a reversible process. Therefore, the condition, `Carnot efficiency at zero-EP rate' can be regarded as a strong condition for a reversible process. Here, however, we show that the detailed balance can be broken for a zero-EP rate process and even for a process achieving the Carnot efficiency at a zero-EP rate in an example of a quantum-dot model. This clearly demonstrates that `Carnot efficiency at zero-EP rate' or just `zero-EP rate' is not a sufficient condition for a reversible process.
Biomedical Engineering Letters’ Decade-long Success
Jae Sung Lee 대한의용생체공학회 2021 Biomedical Engineering Letters (BMEL) Vol.11 No.1
As Editor-in-Chief, on behalf of the editorial team, I wouldlike to celebrate the success of Biomedical Engineering Lettersover the past decade. Biomedical Engineering Lettersis an interdisciplinary, international journal dedicated to thepublication of original investigations concerned with majoraspects of biomedical engineering and applied biophysics. The journal dates back to 2011 when the first issue waspublished. Since that year, 10 issues have been successfullypublished thanks to the extraordinary efforts of all editorialteam members and strong support from the leadership ofthe Korean Society of Medical and Biological Engineering. The journal is progressively evolving to occupy a uniqueposition in the global community of biomedical engineeringjournals by publishing innovative original articles in biomedicalengineering and applied biophysics. In addition,diverse topical collections have been published in the journalby a group of dedicating Guest Editors who brought bestexperts in the fields, providing reviews on trendy topics. In2021, we are planning special issues on three emerging topicsincluding wearable and implantable biomedical sensorsand nanomedicine.