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Stability of operation versus temperature of a three-phase clock-driven chaotic circuit

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Chinese Physics B 2013年第12期22卷 152-159页

作者：周继超 Hyunsik Son Namtae Kim han jung Song Department of Nano Systems Engineering Inje University Department of Electronic Engineering Inje University Center for Nano Manufacturing Inje University

We evaluate the influence of temperature on the behavior of a three-phase clock-driven metal–oxide–semiconductor （MOS） chaotic circuit. The chaotic circuit consists of two nonlinear functions, a level shifter, and three sample and hold blocks. It is necessary to analyze a CMOS-based chaotic circuit with respect to variation in temperature for stability because the circuit is sensitive to the behavior of the circuit design parameters. The temperature dependence of the proposed chaotic circuit is investigated via the simulation program with integrated circuit emphasis （SPICE） using 0.6-μm CMOS process technology with a 5-V power supply and a 20-kHz clock frequency. The simulation results demonstrate the effects of temperature on the chaotic dynamics of the proposed chaotic circuit. The time series, frequency spectra, bifurcation phenomena, and Lyapunov exponent results are provided.

关键词： chaotic circuit nonlinear functions temperature effect bifurcation Lyapunov exponent

Floating forest:A novel breakwater-windbreak structure against wind and wave hazards

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Frontiers of Structural and Civil Engineering 2021年第5期15卷 1111-1127页

作者： Chien Ming WANG Mengmeng han Junwei LYU Wenhui DUAN Kwanghoe jung School of Civil Engineering The University of QueenslandQueensland 4072Australia Department of Civil Engineering Monash UniversityVictoria 3168Australia Hyundai Engineering and Construction Technology Research CentreSeoul 03058Korea

A novel floating breakwater-windbreak structure(floating forest)has been designed for the protection of vulnerable coastal areas from extreme wind and wave loadings during storm *** modular arch-shaped concrete structure is positioned perpendicularly to the direction of the prevailing wave and *** structure below the water surface acts as a porous breakwater with wave scattering *** array of tubular columns on the sloping deck of the breakwater act as an artificial forest-type windbreak.A feasibility study involving hydrodynamic and aerodynamic analyses has been performed,focusing on its capability in reducing wave heights and wind speeds in the lee *** study shows that the proposed 1 km long floating forest is able to shelter a lee area that stretches up to 600 m,with 40%–60%wave energy reduction and 10%–80%peak wind speed reduction.

关键词： floating structure breakwater windbreak hydrodynamic CFD

Impact of guideline adherence on the prognosis of Barcelona clinic liver cancer stage B hepatocellular carcinoma

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World Journal of Gastroenterology 2023年第47期29卷 6122-6137页

作者： Ji Eun han Hyo jung Cho Jae Youn Cheong Sun Gyo Lim Min Jae Yang Choong-Kyun Noh Gil Ho Lee Soon Sun Kim Department of Gastroenterology Ajou University School of MedicineSuwon 16499Gyeonggi-doSouth Korea

BACKGROUND Patients with Barcelona clinic liver cancer(BCLC)stage B hepatocellular carcinoma(HCC)are considerably heterogeneous in terms of tumor burden,liver function,and performance *** improve the poor survival outcomes of these patients,treatment approaches other than transarterial chemoembolization(TACE),which is recommended by HCC guidelines,have been adopted in realworld clinical *** hypothesize that this non-adherence to treatment guidelines,particularly with respect to the use of liver resection,improves survival in patients with stage B *** To assess guideline adherence in South Korean patients with stage B HCC and study its impact on *** A retrospective analysis was conducted using data from 2008 to 2016 obtained from the Korea Central Cancer *** with stage B HCC were categorized into three treatment groups,guideline-adherent,upward,and downward,based on HCC guidelines recommended by the Asian Pacific Association for the Study of the Liver(APASL),the European Association for the Study of the Liver(EASL),and the American Association for the Study of Liver Diseases(AASLD).The primary outcome was HCC-related deaths;tumor recurrence served as the secondary *** among the groups was compared using the Kaplan-Meier method and the log-rank *** of survival outcomes were identified using multivariable Cox regression *** In South Korea, over the study period from 2008 to 2016, a notable trend was observed in adherence to HCCguidelines. Adherence to the EASL guidelines started relatively high, ranging from 77% to 80% between 2008 and2012, but it gradually declined to 58.8% to 71.6% from 2013 to 2016. Adherence to the AASLD guidelines began at71.7% to 75.9% from 2008 to 2010, and then it fluctuated between 49.2% and 73.8% from 2011 to 2016. In contrast,adherence to the APASL guidelines remained consistently high, staying within the range of 90.14% to 94.5%throughout the entire study per

关键词： Hepatocellular carcinoma Barcelona clinic liver cancer stage B Guideline adherence Liver neoplasms Transarterial chemoembolization Liver resection

不同孔结构CeTiO_(x)催化剂的制备及其NH_(3)-SCR脱硝性能研究

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燃料化学学报（中英文） 2024年第1期52卷 65-75页

作者：谭晨晨韩宇轩胡亚琴沈凯丁世鹏张亚平东南大学能源与环境学院能源热转换及其过程测控教育部重点实验室江苏南京210096

为探究催化剂的孔结构对催化剂脱硝活性的影响,采用溶胶凝胶法分别制备了三维有序大孔-介孔(3DOM-m) CeTiO_(x)、三维有序大孔(3DOM) CeTiO_(x)、三维有序介孔(3DOm) CeTiO_(x)及无序孔(DM) CeTiO_(x)等四种不同孔结构的催化剂。NH3-SC... 详细信息

为探究催化剂的孔结构对催化剂脱硝活性的影响,采用溶胶凝胶法分别制备了三维有序大孔-介孔(3DOM-m) CeTiO_(x)、三维有序大孔(3DOM) CeTiO_(x)、三维有序介孔(3DOm) CeTiO_(x)及无序孔(DM) CeTiO_(x)等四种不同孔结构的催化剂。NH3-SCR测试结果表明,催化剂活性依次为3DOM-m CeTiO_(x)>3DOm CeTiO_(x)>3DOM CeTiO_(x)>DM CeTiO_(x), 3DOM-m CeTiO_(x)表现出更优异的催化活性,NO转化率在60000 h^(-1)、250–400℃时超过90%。通过XRD、SEM、BET、NH_(3)-TPD、in-situ DRIFTS等技术对催化剂进行表征分析。结果表明,催化剂的比表面积并不是决定CeTiO_(x)脱硝活性的主导因素。3DOM-m CeTiO_(x)具有高度有序的大孔-介孔结构、丰富的Bronsted酸酸性位点,进而提高了催化剂的脱硝活性。3DOM-m CeTiO_(x)催化剂在NH_(3)-SCR反应过程中同时遵循E-R机理和L-H机理。

关键词： CeTiO_(x) 三维有序大孔有序介孔 NH_(3)-SCR脱硝

Efficient page layout analysis on small devices

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第6期10卷 800-804页

作者： Eun-jung han Chee-onn WONG Kee-chul jung Kyung-ho LEE Eun-yi KIM Department of Naval Architecture and Ocean Engineering Inha University Human-Centered Interfaces Lab Department of Digital MediaSoongsil University Internet and Media Engineering Konkuk University

Previously we have designed and implemented new image browsing facilities to support effective offline image contents on mobile devices with limited capabilities: low bandwidth, small display, and slow processing. In this letter, we fulfill the automatic production of cartoon contents fitting small-screen display, and introduce a clustering method useful for various types of cartoon images as a prerequisite stage for preserving semantic meaning. The usage of neural networks is to properly cut the various forms of pages. Texture information that is useful for grayscale image segmentation gives us a good clue for page layout analysis using the multilayer perceptron (MLP) based x-y recursive algorithm. We also automatically frame the segment MLP using ag-glomerative segmentation. Our experimental results show that the combined approaches yield good results of segmentation for several cartoons.

关键词：页面布局屏幕显示器装置信件科学聚类分析方法图像分割自动化生产

Defect engineering of ternary Cu-In-Se quantum dots for boosting photoelectrochemical hydrogen generation

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Carbon Energy 2023年第12期5卷 215-228页

作者： Shi Li Sung-Mok jung Wookjin Chung Joo-Won Seo Hwapyong Kim Soo Ik Park Hyo Cheol Lee Ji Su han Seung Beom Ha In Young Kim Su-Il In Jae-Yup Kim Jiwoong Yang Department of Energy Science and Engineering Daegu Gyeongbuk Institute of Science and Technology(DGIST)DaeguRepublic of Korea Department of Chemical Engineering Dankook UniversityYonginRepublic of Korea Department of Chemistry and Nanoscience College of Natural ScienceEwha Womans UniversitySeoulRepublic of Korea Energy Science and Engineering Research Center Daegu Gyeongbuk Institute of Science and Technology(DGIST)DaeguRepublic of Korea

Heavy-metal-free ternary Cu–In–Se quantum dots(CISe QDs)are promising for solar fuel production because of their low toxicity,tunable band gap,and high light absorption *** defects significantly affect the photophysical properties of QDs,the influence on photoelectrochemical hydrogen production is not well ***,we present the defect engineering of CISe QDs for efficient solar-energy *** acid–base reactions between metal halide–oleylamine complexes and oleylammonium selenocarbamate are modulated to achieve CISe QDs with the controlled amount of Cu vacancies without changing their *** them,CISe QDs with In/Cu=1.55 show the most outstanding photoelectrochemical hydrogen generation with excellent photocurrent density of up to 10.7 mA cm-2(at 0.6 VRHE),attributed to the suitable electronic band structures and enhanced carrier concentrations/lifetimes of the *** proposed method,which can effectively control the defects in heavy-metal-free ternary QDs,offers a deeper understanding of the effects of the defects and provides a practical approach to enhance photoelectrochemical hydrogen generation.

关键词： copper-indium-selenide defect engineering photoelectrochemical hydrogen generation quantum dots solar hydrogen

Improvement of Shape Recognition Performance of Sendzimir Mill Control Systems Using Echo State Neural Networks

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Journal of Iron and Steel Research(International) 2014年第3期21卷 321-327页

作者： jung-hyun PARK Seong-ik han Jong-shik KIM School of Mechanical Engineering Pusan National University School of Electrical Engineering Pusan National University

High rigidity twenty-high Sendzimir mills （ZRMs） are widely used for rolling stainless steels, silicon sheets, etc. A ZRM uses a small diameter work roll to produce massive rolling forces. Since a work roll with a small diameter can be bent easily, strips often have complex shapes with mixed quarter and deep edge waves in the shape of plates. In order to solve this problem, fuzzy neural network controls are generally used for shape： recognition in ZRM control systems. Among various neural network types, the multi-layer perceptron （MLP） is typically used in current ZRMs. However, an MLP causes the loss of a large amount of shape recognition data. To improve the shape recognition per- formance of ZRM control systems, echo state networks （ESNs） are proposed to be used. Through simulation re- sults, it is found that shape recognition performance could be improved using the proposed ESN method.

关键词： Sendzimir mill neural network multi-layer perceptron echo state network shape recognition

Coronary Artery Complications after Right Ventricular Outflow Tract Reconstruction Surgery

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Congenital Heart Disease 2022年第3期17卷 281-295页

作者： Hye Won Kwon Mi Kyoung Song Sang Yun Lee Gi Beom Kim Sungkyu Cho Jae Gun Kwak Woong-han Kim Whal Lee Eun jung Bae Department of Pediatrics Seoul National University HospitalSeoul National University College of MedicineSeoulSouth Korea Department of Thoracic and Cardiovascular Surgery Seoul National University HospitalSeoul National University College of MedicineSeoulSouth Korea Department of Radiology Seoul National University HospitalSeoulSouth Korea

Background:Mechanisms and clinical manifestations of coronary artery complications after right ventricular outflow tract reconstruction surgery are not well ***:Patients who had coronary artery complications after pulmonary valve replacement or the Rastelli procedure at a single tertiary centre were retrospectively ***:Coronary artery complications were identified in 20 patients who underwent right ventricular outflow tract reconstruction *** median age at diagnosis of coronary artery complication was 21 years(interquartile range:13–25 years).Mechanisms of coronary artery complications were compression by adjacent materials in 12 patients,dynamic compression of intramural course of coronary artery in two patients,and intraoperative injury in six *** coronary artery anomalies were identified in 50%(10/20)of *** patients presented with early postoperative haemodynamic *** patients showed late onset symptoms or signs of coronary insufficiency,including chest pain,ventricular dysfunction,or ventricular *** artery stenosis was incidentally found on cardiac computed tomography angiography in two asymptomatic *** patients underwent surgical interventions,and one patient underwent percutaneous coronary intervention for coronary *** patient with recurrent ventricular tachycardia required an implantable *** were two deaths in patients with intraoperative coronary ***:Preoperative coronary evaluation and long-term follow-up for the development of coronary artery complications are required in patients undergoing right ventricular outflow tract reconstruction surgery to prevent ventricular dysfunction,arrhythmias,and death,especially among those with congenital coronary anomalies.

关键词： Congenital heart disease right ventricular outflow tract reconstruction surgery coronary artery disease

Controlled oxidation of Ni for stress-free hole transport layer of large-scale perovskite solar cells

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Nano Research 2019年第12期12卷 3089-3094页

作者： Seongha Lee Hee-Suk Roh Gill Sang han jung-Kun Lee Department of Mechanical Engineering and Materials Science University of PittsburghPennsylvania 15261USA School of Advanced Materials Science and Engineering Sungkyunkwan UniversitySuwon 16419Republic of Korea

The effect of the residual thermal stress of NiO films on the performance of an inverted type perovskite solar cell was *** this study,NiO films were grown on fluorine dopedtin oxide(FTO)substrates of different surface roughness by thermally oxidizing Ni film and weretested as a hole transport layer for large-scale perovskite solar *** and simulation results show that it is very important tosuppress the appearance of the residual stress at the NiO-FTO in terface during the oxidation of the Ni film for effective hole extracti *** Ni oxidation on the flat FTO film produced in-plane compressive stress in the NiO film due to the Ni film volume *** led to theformation of defects including small *** residual stress and defects in creased leakage curre nt through the NiO film,preve ntingholes from being selectively collected at the NiO-perovskite ***,when Ni was deposited and oxidized on the rough surface,the residual stress of the NiO film was negligible and its inhere nt high resistance was ***-free NiO film is an excelle nt holetransport layer that stops the photogenerated electrons of the perovskite layer from moving to *** improvements in the structural andelectrical qualities of the NiO film by engirteering the residual stress reduce the carrier recombination and increase the power conversi onefficiency of the perovskite solar cells to 16.37%.

关键词： nickel oxidation surface roughness residual stress perovskite solar cells large scale processing