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Accelerating Falcon Post-Quantum Digital Signature Algorithm on Graphic Processing Units

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Computers, Materials & Continua 2023年第4期75卷 1963-1980页

作者： Seog chung Seo Sang woo An Dooho Choi Kookmin University Seoul02707Korea Telecommunications Technology Association(TTA) Gyeonggi-do13591Korea Korea University Sejong30019Korea

Since 2016,the National Institute of Standards and Technology(NIST)has been performing a competition to standardize post-quantum cryptography(PQC).Although Falcon has been selected in the competition as one of the standard PQC algorithms because of its advantages in short key and signature sizes,its performance overhead is larger than that of other lattice-based *** study presents multiple methodologies to accelerate the performance of Falcon using graphics processing units(GPUs)for server-side *** GPU porting significantly degrades performance because the Falcon reference codes require recursive functions in its sampling ***,an iterative sampling approach for efficient parallel processing is *** this study,the Falcon software applied a fine-grained execution model and reported the optimal number of threads in a thread ***,the polynomial multiplication performance was optimized by parallelizing the number-theoretic transform(NTT)-based polynomial multiplication and the fast Fourier transform(FFT)-based ***,dummy-based parallel execution methods have been introduced to handle the thread divergence *** presented Falcon software on RTX 3090 NVIDA GPU based on the proposed methods with Falcon-512 and Falcon-1024 parameters outperform at 35.14,28.84,and 34.64 times and 33.31,27.45,and 34.40 times,respectively,better than the central processing unit(CPU)reference implementation using Advanced Vector Extensions 2(AVX2)instructions on a Ryzen 95900X running at 3.7 GHz in key generation,signing,and verification,***,the proposed Falcon software can be used in servers managing multiple concurrent clients for efficient certificate verification and be used as an outsourced key generation and signature generation server for Signature as a Service(SaS).

关键词： DSA Falcon GPU CUDA software optimization

Beach stabilization by the laying of a drainage layer

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Science China(Technological Sciences) 2012年第9期55卷 2625-2639页

作者： HUR Dong-Soo LEE woo-Dong CHO Won-chul Department of Ocean Civil Engineering(Institute of Marine Industry) Gyeongsang National University445 Inpyeong-dongTongyeong 650-160Korea Department of Ocean Civil Engineering Gyeongsang National University445 Inpyeong-dongTongyeong 650-160Korea Department of Civil and Environmental Engineering Chung-Ang University221 Heuksuk-dong Dongjak-guSeoul 156-756Korea

In the present study, the stabilization effects of the laying of a drainage layer in a sandy beach were analyzed. The numerical model developed by Hur et al. （2011） was used to examine the characteristics of wave-sandy beach interaction with/without a drainage layer. This numericai model directly simulates Wave-Structure-Seabed/Sandy （WASS） beach interaction by consid- ering flow through a porous medium with inertia, laminar and turbulent resistances, and determines the eddy viscosity with the Large Eddy Simulation （LES） turbulent model in a 3-D wave field （LES-WASS-3D）. Based on the numerical results, it ap- pears that the installation of a drainage layer in the beach results in a decrease in both the mean groundwater level around the foreshore and the flow moving offshore on the beach surface. Spatial distributions of the mean groundwater level and wave setup around the foreshore with various arrangements of the drainage layer and conditions of the incident wave are also discussed in this paper.

关键词： drainage layer groundwater level foreshore LES-WASS-3D (3-D numerical simulation) beach stabilization swash zone

Retraction control of motorized seat belt system with linear state observer

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Journal of Central South University 2013年第2期20卷 385-392页

作者： LEE Kang-seok CHOI Chin-chul LEE woo-taik Department of Control and Instrumentation Engineering Changwon National University

A design and verification of linear state observers which estimate state information such as angular velocity and load torque for retraction control of the motorized seat belt (MSB) system were described. The motorized seat belt system provides functions to protect passengers and improve passenger's convenience. Each MSB function has its own required belt tension which is determined by the function's purpose. To realize the MSB functions, state information, such as seat belt winding velocity and seat belt tension are required. Using a linear state observer, the state information for MSB operations can be estimated without sensors. To design the linear state observer, the motorized seat belt system is analyzed and represented as a state space model which contains load torque as an augmented state. Based on the state space model, a linear state observer was designed and verified by experiments. Also, the retraction control of the MSB algorithm using linear state observer was designed and verified on the test bench. With the designed retraction control algorithm using the linear state observer, it is possible to realize various types of MSB functions.

关键词： motorized seat belt system motorized seat belt (MSB) system linear state observer state space model augmented state retraction control

A Power-Aware Branch Predictor by Accessing the BTB Selectively

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Journal of Computer Science & Technology 2005年第5期20卷 607-614页

作者： Cheol Hong Kim Sung woo chung Chu Shik Jhon Mobile System Laboratory Department of Electrical Engineering and Computer Science Seoul National University Seoul 151-742 Korea Department of Computer Science University of Virginia Charlottesville Virginia 22904 U.S.A.

Microarchitects should consider power consumption, together with accuracy, when designing a branch predictor, especially in embedded processors. This paper proposes a power-aware branch predictor, which is based on the gshare predictor, by accessing the BTB （Branch Target Buffer） selectively. To enable the selective access to the BTB, the PHT （Pattern History Table） in the proposed branch predictor is accessed one cycle earlier than the traditional PHT if the program is executed sequentially without branch instructions. As a side effect, two predictions from the PHT are obtained through one access to the PHT, resulting in more power savings. In the proposed branch predictor, if the previous instruction was not a branch and the prediction from the PHT is untaken, the BTB is not accessed to reduce power consumption. If the previous instruction was a branch, the BTB is always accessed, regardless of the prediction from the PHT, to prevent the additional delay/accuracy decrease. The proposed branch predictor reduces the power consumption with little hardware overhead, not incurring additional delay and never harming prediction accuracy. The simulation results show that the proposed branch predictor reduces the power consumption by 29-47%.

关键词： branch predictor BTB embedded processor low power design PHT

A fast and simple system performance emulator for enhanced solid state disks:a case study of long read operations

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Journal of Zhejiang University-Science C(Computers and Electronics) 2010年第6期11卷 418-424页

作者： Do Yeun KIM Chanik PARK Eui-Young chung Sung woo chung Division of Computer and Communication Engineering Korea University Seoul 13-713 Korea Samsung Electronics Yongin-City Kyunggi-Do 446-701 Korea School of Electrical and Electronic Engineering Yonsei University Seoul 120-749 Korea

In this paper, we propose a fast and simple system emulator, called a system performance emulator(SPE), to evaluate long read *** SPE estimates how much system-wide performance is enhanced by using a faster solid state disk(SSD).By suspending a CPU for a certain time during direct memory access(DMA) transfer and subtracting this suspended time from the total DMA time, the SPE estimates the improvement in system performance expected from an enhanced SSD prior to its *** also examine the relation between storage performance and system performance using the SPE.

关键词： Solid state disk(SSD) Performance emulator System performance Direct memory access(DMA) Operating system

Formation of FeMo_2B_2 phase in boron containing 9Cr-1.5Mo ferritic steels

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Rare Metals 2006年第Z2期25卷 213-219页

作者： JUNG woo-Sang HONG Suk-woo SONG Sang-Min SOOK-In Kwun chung Soon-Hyo Materials Science & Technology Division Korea Institute of Science & Technology Seoul 136-791 Korea Department of Materials Science and Engineering Korea University Seoul 136-713 Korea

The segregation and diffusion of boron during heat treatments were studied. The influence of boron contents, aging time and applied stress on FeMo2B2 formation was also studied. Finally, the effects of boron contents and FeMo2B2 formation on the high temperature strength were studied. Boron atoms were segregated to prior austenite grain boundary during normalizing treatment. And these boron atoms were slowly diffused into the grain interior during tempering and aging at 700 ℃. The FeMo2B2 phase was only formed after 1,000 h aging at 700 ℃ in alloy containing 196 ppm boron. The formation of FeMo2B2 phase is accelerated by the applied stress. It was expected that the formation of FeMo2B2 is closely related to the redistribution of boron atoms. The tensile strengths at 700 ℃ are increased with the increase of boron contents. However, the formation of FeMo2B2 phase results in lower tensile strength.

关键词： 9Cr-1.5Mo ferritic steels precipitation behavior boron effect FeMo2B2 phase tensile strength

Molecular targeted therapy for hepatocellular carcinoma:Current and future

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World Journal of Gastroenterology 2013年第37期19卷 6144-6155页

作者： Jung woo Shin Young-Hwa chung Department of Internal Medicine University of Ulsan College of Medicine Ulsan University Hospital Department of Internal Medicine University of Ulsan College of MedicineAsan Medical Center

Hepatocellular carcinoma(HCC)is one of the most frequent tumors *** majority of HCC cases occur in patients with chronic liver *** regular surveillance to detect small HCC in these patients,HCC is often diagnosed at an advanced *** HCC is highly resistant to conventional systemic therapies,the prognosis for advanced HCC patients remains *** introduction of sorafenib as the standard systemic therapy has unveiled a new direction for future research regarding HCC ***,given the limited efficacy of the drug,a need exists to look beyond *** molecular targeted agents that inhibit different pathways involved in hepatocarcinogenesis are under various phases of clinical development,and novel targets are being assessed in *** review aims to summarize the efforts to target molecular components of the signaling pathways that are responsible for the development and progression of HCC and to discuss perspectives on the future direction of research.

关键词： Hepatocellular carcinoma Targeted therapy Molecular agents Sorafenib

Neglected corticospinal tract injury for 10 months in a stroke patient

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Neural Regeneration Research 2015年第12期10卷 2060-2061页

作者： Sung Ho Jang chul Hoon Chang woo Hyuk Jang Department of Physical Medicine and Rehabilitation College of MedicineYeungnam University Department of Neurosurgery College of MedicineYeungnam University

The corticospinal tract（CST）is an essential motor pathway in the human brain：particularly,it is essential for fine hand movements（Jang,2014）.Stroke patients can show more severe weakness when a partial injury of ... 详细信息

关键词： MCA Neglected corticospinal tract injury for 10 months in a stroke patient CST

Successful kidney transplantation from an expanded criteria donor with long-term extracorporeal membrane oxygenation treatment: A case report

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World Journal of Clinical Cases 2020年第3期8卷 540-545页

作者： Hye Won Seo Sua Lee Hwa Young Lee Sun Cheol Park Byung Ha chung chul woo Yang Tae Hyun Ban Division of Nephrology Department of Internal MedicineSeoul St.Mary’s HospitalCollege of MedicineThe Catholic University of KoreaSeoul 06591South Korea Transplant Research Center Department of Internal MedicineSeoul St.Mary’s HospitalCollege of MedicineThe Catholic University of KoreaSeoul 06591South Korea Division of Nephrology Department of Internal MedicineJeju National University HospitalJeju-do 63241South Korea Department of Surgery Seoul St.Mary’s HospitalCollege of MedicineThe Catholic University of Korea222 Banpo-daeroSeoul 06591South Korea Division of Nephrology Department of Internal MedicineEunpyeong St.Mary’s HospitalCollege of MedicineThe Catholic University of KoreaEunpyeong-guSeoul 03312South Korea

BACKGROUND Due to a shortage of donor kidneys, many centers have utilized graft kidneys from brain-dead donors with expanded criteria. Kidney transplantation(KT)from donors on extracorporeal membrane oxygenation(ECMO) has been identified as a successful way of expanding donor pools. However, there are currently no guidelines or recommendations that guarantee successful KT from donors undergoing ECMO treatment. Therefore, acceptance of appropriate allografts from those donors is solely based on clinician *** SUMMARY We report a case of successful KT from a brain-dead donor supported by ECMO for the longest duration to date. A 69-year-old male received a KT from a 63-yearold brain-dead donor who had been on therapeutic ECMO treatment for the previous three weeks. The recipient experienced slow recovery of graft function after surgery but was discharged home on post-operative day 17 free from hemodialysis. Allograft function gradually improved thereafter and was comparatively acceptable up to the 12 mo follow-up, with serum creatinine level of 1.67 mg/d *** This case suggests that donation even after long-term ECMO treatment could provide successful KT to suitable candidates.

关键词： Extracorporeal membrane oxygenation Kidney transplantation Delayed graft function Donor selection Case report