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Robust and Reusable Fuzzy Extractors from Non-Uniform Learning with Errors Problem

Computers, Materials & Continua 2023年第1期74卷 1985-2003页

作者： Joo Woo jonghyun Kim jong Hwan park Graduate School of Information Security Korea UniversitySeoul02841Korea Department of Computer Science Sangmyung UniversitySeoul03016Korea

Afuzzy extractor can extract an almost uniformrandom string from a noisy source with enough entropy such as biometric *** reproduce an identical key from repeated readings of biometric data,the fuzzy extractor generates a helper data and a random string from biometric data and uses the helper data to reproduce the random string from the second *** 2013,Fuller et *** a computational fuzzy extractor based on the learning with errors *** construction,however,can tolerate a sub-linear fraction of errors and has an inefficient decoding algorithm,which causes the reproducing time to increase *** 2016,Canetti et *** a fuzzy extractor with inputs from low-entropy distributions based on a strong primitive,which is called digital ***,their construction necessitates an excessive amount of storage space for the helper data,which is stored in authentication *** on these observations,we propose a new efficient computational fuzzy extractorwith small size of helper *** scheme supports reusability and robustness,which are security notions that must be satisfied in order to use a fuzzy extractor as a secure authentication method in real ***,it conceals no information about the biometric data and thanks to the new decoding algorithm can tolerate linear *** on the non-uniform learning with errors problem,we present a formal security proof for the proposed fuzzy ***,we analyze the performance of our fuzzy extractor scheme and provide parameter sets that meet the security *** a result of our implementation and analysis,we show that our scheme outperforms previous fuzzy extractor schemes in terms of the efficiency of the generation and reproduction algorithms,as well as the size of helper data.

关键词： Fuzzy extractor reusability robustness biometric authentication non-uniform learning with errors

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Diagnostic evaluation of endoscopic ultrasonography with submucosal saline injection for differentiating between T1a and T1b early gastric cancer

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World Journal of Gastroenterology 2022年第46期28卷 6564-6572页

作者： Ji Young park tae Joo Jeon Department of Internal Medicine Inje University College of MedicineSanggye Paik HospitalSeoul 01757South Korea Department of Internal Medicine Yonsei University College of MedicineSeoul 03722South Korea

BACKGROUND Endoscopic ultrasonography(EUS)has become a reliable method for predicting the invasion depth of early gastric cancer(EGC).However,diagnostic accuracy of EUS is affected by several *** particular,it is difficult to differentiate between T1a and T1b EGC through *** To confirm whether submucosal saline injection(SSI)could improve the accuracy of EUS in distinguishing T1a and T1b lesions in *** Twenty-four patients with EGC were examined by EUS and subsequently by SSI combined EUS to compare the degree of tumor ***,they underwent endoscopic or surgical resection within 7 *** diagnostic accuracy of EUS and SSI combined EUS was evaluated based on the final pathological findings *** injected into the submucosa acted as an echoic contrast enhancing agent and had the effect of distinguishing the mucosal and submucosal layers *** Of total 24 patients,23 were diagnosed with EGC(T1 cancer:13 as T1a,and 10 as T1b).Standard EUS identified 6 of 13 T1a cancer patients and 3 of 10 T1b cancer ***,EUS-SSI identified 12 of 13 T1a cancer patients and 6 of 10 T1b cancer *** this study,SSI combined EUS was more accurate than EUS alone in diagnosing T1a and T1b lesions of EGC(75.0%and 37.5%,respectively).CONCLUSION SSI improved the diagnostic accuracy of EUS in distinguishing between the T1a and T1b stages in EGC.

关键词： Endoscopic ultrasonography Gastric cancer Endoscopy Surgery

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Clinical significance of the neutrophil-lymphocyte ratio as an early predictive marker for adverse outcomes in patients with acute pancreatitis

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World Journal of Gastroenterology 2017年第21期23卷 3883-3889页

作者： tae Joo Jeon Ji Young park Division of Gastroenterology Department of Internal Medicine Inje University College of Medicine Sanggye Paik Hospital

AIM To investigated the prognostic value of the neutrophillymphocyte ratio(NLR) in patients with acute pancreatitis and determined an optimal cut-off value for the prediction of adverse outcomes in these *** We retrospectively analyzed 490 patients with acute pancreatitis diagnosed between March 2007 and December 2012. NLRs were calculated at admission and 24, 48, and 72 h after admission. Patients were grouped according to acute pancreatitis severity and organ failure occurrence, and a comparative analysis was performed to compare the NLR between groups. RESULTS Among the 490 patients, 70 had severe acute pancreatitis with 31 experiencing organ failure. The severe acute pancreatitis group had a significantly higher NLR than the mild acute pancreatitis group on all 4 d(median, 6.14, 6.71, 5.70, and 4.00 vs 4.74, 4.47, 3.20, and 3.30, respectively, P < 0.05). The organ failure group had a significantly higher NLR than the group without organ failure on all 4 d(median, 7.09, 6.72, 6.27, and 6.24 vs 4.85, 4.49, 3.35, and 2.34, respectively, P < 0.05). The optimal cut-off value for baseline NLR was 4.76 in predicting severity and 4.88in predicting organ failure in acute pancreatitis. CONCLUSION Elevated baseline NLR correlates with severe acute pancreatitis and organ failure.

关键词： Acute pancreatitis Neutrophil-lymphocyte ratio Organ failure Severe acute pancreatitis

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Anti-integrin therapy for inflammatory bowel disease

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World Journal of Gastroenterology 2018年第17期24卷 1868-1880页

作者： Sung Chul park Yoon tae Jeen Division of Gastroenterology and Hepatology Department of Internal Medicine Kangwon National University School of Medicine Division of Gastroenterology and Hepatology Department of Internal Medicine Korea University Anam Hospital orea University College of Medicine

In inflammatory bowel disease(IBD), tumor necro-sis factor plays an important role in mediating infla-mmation, but several other pathways are also involved in eliciting an inflammatory response. One such pathway is the invasion of the intestinal mucosa by leukocytes. Leukocytes within the systemic circulation move to sites of inflammation, and blocking this pathway could be an important treatment strategy for IBD. Anti-integrin therapy blocks the action of integrin on the surface of circulating immune cells and endothelial cell adhesion molecules, thereby inhibiting the interactions between leukocytes and intestinal blood vessels. Natalizumab, which acts on α4-integrin, was the first such drug to be approved for Crohn's disease, but its use is limited due to the risk of progressive multifocal leukoencephalopathy. Vedolizumab produces few systemic adverse effects because it acts on gut-trophic α4β7 integrin, and has been approved and is being used to treat IBD. Currently, several anti-integrin drugs, including etrolizumab, which acts on β7-integrin, and PF-00547569, which targets mucosal addressin cell adhesion molecule-1, are undergoing clinical trials and the results are being closely watched.

关键词： Integrin Ulcerative colitis Crohn’s disease Natalizumab Abrilumab Etrolizumab PF-00547659 Inflammatory bowel disease AJM300 Vedolizumab

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Effects of tissue-cultured mountain ginseng （Panax ginseng CA Meyer） extract on male patients with erectile dysfunction

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Asian Journal of Andrology 2009年第3期11卷 356-361页

作者： tae-Hwan Kim Seung Hyun Jeon Eun-Joo Hahn Kee-Yoeup Paek jong Kwan park Nae Young Youn Hyung-Lae Lee Department of Urology School of Medicine Kyung Hee University Seoul 134-727 Korea Research Center for the Development of Advanced Horticultural Technology Chungbuk National University Cheongju 361-711 Korea Department of Urology Chonbuk National University Medical School Jeonju 561-712 Korea Infertility Clinic Sanbornjeil Women＇s Hospital Kunpo 435-042 Korea

Korean ginseng and mountain ginseng （Panax ginseng CA Meyer） are important traditional herbal plants whose ginsenosides are generally accepted as serving to improve sexual functions, such as penile erection. We investigated the effects of tissue-cultured mountain ginseng extract （TMGE） on male patients with erectile dysfunction （ED）. A double-blind, placebo-controlled study was conducted with 143 patients experiencing ED. Over the course of 8 weeks, one group took 1 000 mg of TMGE twice a day, and the other group took 1 000 mg of placebo twice a day. The effects of the TMGE and the placebo were analyzed using the Korean version of the International Index of Erectile Function （IIEF） questionnaire. A total of 86 patients completed 8 weeks of treatment. The scores on the five domains of the IIEF after medication were significantly higher than the baseline scores in the group treated with TMGE （P 〈 0.05）, whereas no significant improvement was observed in the placebo group （P 〉 0.05）. Erectile function and overall satisfaction scores after medication were significantly higher in the TMGE group than in the placebo group （P 〈 0.05）. Erectile function of patients in the TMGE-treated group significantly improved, suggesting that TMGE could be utilized for improving erectile function in male patients.

关键词： erectile dysfunction Panax ginseng tissue-cultured mountain ginseng extract

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Comparison of electrochemical properties of atmospheric pressure plasma coatings for Al_2O_3-3TiO_2 and CoNiCrAlY in sea water

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中国有色金属学会会刊：英文版 2012年第S3期22卷 745-752页

作者： Seong-jong KIM Seong-kweon KIM Jae-cheul park Division of Marine Engineering Mokpo Maritime University Department of Electronic IT Media Engineering Institue of TechnologySeoul National University of Science and Technology New Growth Technical Support Team Green and Industrial Technology CenterKorean Register of Shipping

To improve the durability of underwater rotating products,the corrosion characteristics in harsh marine environment were evaluated through various electrochemical experiments on the Al2O3-3TiO2 and CoNiCrAlY coating layers by atmospheric pressure plasma spray coating *** evaluating the corrosion resistance of these materials,their applicability to environmentally friendly power generation equipment such as blades of tidal current turbines was *** to the Tafel analysis for micro-areas including the coating layer,the coating/metal interlayer and the base metal,the Al2O3-3TiO2 coating layer and the CoNiCrAlY coating layer show markedly lower corrosion current density than the base *** corrosion current density of the CoNiCrAlY coating layer (9.75316×10-8A/cm2) is about 1.6 times more than that of the Al2O3-3TiO2 coating layer (6.13139×10-8A/cm2).

关键词： Al2O3-3TiO2 coating layer CoNiCrAlY coating layer underwater rotating products marine environment corrosion characteristics atmospheric pressure plasma spray

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Upper gastrointestinal bleeding from duodenal vascular ectasia in a patient with cirrhosis

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World Journal of Gastroenterology 2007年第38期13卷 5154-5157页

作者： Beom Jae Lee jong-Jae park Yeon Seok Seo Ji Hoon Kim Aeree Kim jong Eun Yeon Jae Seon Kim Kwan Soo Byun Young-tae Bak Division of Gastroenterology Department of Internal Medicine Korea University College of Medicine Seoul Korea

We report a cirrhotic patient with duodenal vascular ectasia and spontaneous bleeding. The bleeding was successfully controlled with argon plasma coagulation. Duodenal vascular ectasia may be a cause of upper gastrointestinal bleeding in patients with cirrhosis, and argon plasma coagulation may be effective and safe to achieve hemostasis of this lesion.

关键词： Vascular ectasia Duodenum Cirrhosis Gastrointestinal hemorrhage Hemostasis

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Effects of surface roughness on bending properties of rolled AZ31 alloy

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Journal of Magnesium and Alloys 2023年第4期11卷 1224-1235页

作者： Gyo Myeong Lee jong Un Lee Sung Hyuk park School of Materials Science and Engineering Kyungpook National UniversityDaegu 41566Republic of Korea

This study investigated the effects of mechanical-polishing-induced surface roughness and the direction of polishing lines on the bending properties of a rolled AZ31 *** this end,three-point bending tests were performed on one sample without polishing lines(SS sample)and two samples with polishing lines—one in which the polishing lines were parallel to the rolling direction(RS-RD sample)and the other in which they were parallel to the transverse direction(RS-TD sample).In all three samples,macrocracks were formed in the width direction on the outer surface,where tensile stress was predominantly generated in the longitudinal ***,the macrocracks formed in the SS sample were curved because of the merging of uniformly formed fine microcracks,whereas those formed in the RS-TD sample were linear owing to the formation of relatively coarse microcracks along the polishing *** bendability of the samples was in the order of SS>RS-RD>RS-TD,and their limiting bending depths were 4.8,4.6,and 4.4 mm,*** the presence of mechanical-polishing-induced surface roughness,polishing lines perpendicular to the direction of the major stress(i.e.,tensile stress along the longitudinal direction)resulted in a greater degree of stress concentration on the outer surface of the bending *** higher stress concentration promoted the formation of undesirable{10–11}contraction and{10–11}–{10–12}double twins—which typically act as crack initiation sites—and thereby facilitated crack generation and ***,the surface roughness caused premature fracture during bending deformation,which,in turn,caused deterioration of the bendability of the rolled Mg alloy.

关键词： AZ31 alloy Bending Surface roughness Stress concentration Crack

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Scratch formation and its mechanism in chemical mechanical planarization (CMP)

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Friction 2013年第4期1卷 279-305页

作者： tae-Young KWON Manivannan RAMACHANDRAN Jin-Goo park Department of Materials Engineering Hanyang UniversityAnsan 426-791Korea

Chemical mechanical planarization(CMP)has become one of the most critical processes in semiconductor device fabrication to achieve global *** achieve an efficient global planarization for device node dimensions of less than 32 nm,a comprehensive understanding of the physical,chemical,and tribo-mechanical/chemical action at the interface between the pad and wafer in the presence of a slurry medium is *** the CMP process,some issues such as film delamination,scratching,dishing,erosion,and corrosion can generate defects which can adversely affect the yield and *** this article,an overview of material removal mechanism of CMP process,investigation of the scratch formation behavior based on polishing process conditions and consumables,scratch formation mechanism and the scratch inspection tools were extensively *** advantages of adopting the filtration unit and the jet spraying of water to reduce the scratch formation have been *** current research trends in the scratch formation,based on modeling perspective were also discussed.

关键词： Chemical mechanical planarization(CMP) defects,scratch post-CMP cleaning defect source

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Bending properties of extruded AZ91–0.9Ca–0.6Y alloy and their improvement through precompression and annealing

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Journal of Magnesium and Alloys 2022年第8期10卷 2238-2251页

作者： jong Un Lee Gyo Myeong Lee Sung Hyuk park School of Materials Science and Engineering Kyungpook National UniversityDaegu 41566Republic of Korea

In this study,an extruded Mg–9Al–1Zn–0.3Mn–0.9Ca–0.6Y(AZXW9110)alloy is subjected to precompression and subsequent annealing(PCA)treatment for improving its bending formability,and the three-point bending properties of the as-extruded material and the precompressed and subsequently annealed(PCAed)material at room temperature are *** bending,microcracks formed in undissolved Al2Ca,Al2Y,and Al8Mn4Y particles propagate along the grain boundaries or twin boundaries and consequently form a macrocrack in the tension zones of the bending samples of both the ***,the bending formability of the PCAed material is 75%higher than that of the as-extruded material owing to the promoted twinning and slip behaviors in the *** as-extruded material has a strong normal direction(ND)texture and a weak transverse direction(TD)texture,and the ND-and TD-oriented grains are unfavorable for both{10–12}twinning and basal slip in the tension zone of the bending sample of this material,which eventually results in its low bending *** PCAed material has a strong extrusion direction(ED)texture,weak TD texture,and spread ND *** bending,{10–12}twins are fully formed in the ED-oriented grains,and this{10–12}twinning effectively accommodates the plastic strain in the tension *** addition,the activation of basal slip in the ND-oriented grains of the PCAed material is promoted owing to the spread ND texture of this ***,this material exhibits substantially superior bending formability because of the vigorous{10–12}twinning in its ED-oriented grains and promoted basal slip in its ND-oriented grains.

关键词： Magnesium Bending Formability Twinning Texture

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