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A macroscopic constitutive model of shape memory alloy considering cyclic effects

Science China(Physics,Mechanics & Astronomy) 2013年第4期56卷 755-764页

作者： ZHOU Bo yoon Sung-Ho College of Pipeline and Civil Engineering China University of Petroleum School of Mechanical Engineering Kumoh National Institute of Technology

This paper presents a macroscopic constitutive model reproducing the hysteretic behaviors of the superelastic shape memory alloy (SMA) under cyclic loading. The progressive increase of residual strain with the increased cycle number in such materials is assumed to be a consequence of the progressive increase of residual stress-induced martensitic volume fraction upon the cyclic effects. The progressive decrease of phase transformation critical stresses with the increased cycle number in such materials is assumed to be a result from the progressive increase of phase transformation critical temperatures upon the cyclic effects. A cyclic evolution equation is supposed to describe the influences of cycle effects on the material properties of the SMA under cyclic loading. A phase transformation equation expressing the phase transformation behaviors of the SMA under cyclic loading is established based on the differential relationship between martensitic volume fraction and the free energy increment of phase transformation. A mechanical constitutive equation predicting the mechanical characteristics of the SMA under cyclic loading is developed on the basis of thermodynamics and continuum mechanics. The cyclic evolution equation, phase transformation equation, and mechanical constitutive equation together compose the presented macroscopic constitutive model considering cyclic effects. Results of the numerical simulations illustrate that it can well reproduce the superelastic hysteretic behaviors of the SMA under cyclic loading.

关键词： shape memory alloy cyclic effect cyclic evolution equation phase transformation equation mechanical constitutive equation

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Reaction mechanism and additional lithium storage of mesoporous MnO_(2) anode in Li batteries

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Journal of Energy Chemistry 2021年第2期30卷 276-284,I0010页

作者： Jaesang yoon Woosung Choi Taewhan Kim Hyunwoo Kim Yun Seok Choi Ji Man Kim Won-Sub yoon Department of Energy Science Sungkyunkwan UniversitySuwon 16419South Korea Department of Chemistry Sungkyunkwan UniversitySuwon 16419South Korea

Nanostructured transition metal oxides,employed as anode materials for lithium-ion batteries,exhibit a higher capacity than the theoretical capacity based on the conversion *** date,the reasons behind this phenomenon are *** the one-step evolution of anode material for lithium-ion batteries,it is essential to understand the lithium storage reaction mechanism of the anode ***,we provide a detailed report on the lithium storage and release mechanism of MnO2,using synchrotron-based X-ray techniques.X-ray diffraction and X-ray absorption spectroscopy results indicate that during the first discharge,MnO2 is reduced in the order of MnO2→LixMnO2(1

关键词： Mesoporous MnO_(2) Reaction mechanism Electrolyte-derived surface layer Synchrotron-based X-ray techniques Anode Li battery

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Performance evaluations on inner vs. outer decomposition first parallel join algorithms for two nested loop joins

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Journal of Central South University 2014年第10期21卷 3873-3882页

作者： Seo-Young NOH Heejun yoon Il-Yeon YEO yoon-su JEONG Hyungwoo PARK National Institute of Supercomputing and Networking Korea Institute of Science and Technology Information Department of Information Communication Engineering Mokwon University

Two popular traditional join algorithms and their parallel versions are introduced. When designing join algorithms in serial computing environment, decomposing inner relation is considered as the right direction to save disk I/Os. However, two different decomposition algorithms are compared, such as inner vs. outer decomposition first algorithms for tuple-based and block-based nested loop joins, showing that the proposed approach is 20% better than general approach. Also lemmas are proved, when we have to use the outer decomposition first parallel join algorithms.

关键词： parallel join performance inner decomposition outer decomposition

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Development of Air Vehicle with Active Flapping and Twisting of Wing

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Journal of Bionic Engineering 2011年第1期8卷 1-9页

作者： Sangyol yoon Lac-Hyong Kang Sungho Jo Department of Computer Science Korea Advanced Institute of Science and Technology Daejeon 305-701 Korea Department of Aerospace Engineering Korea Advanced Institute of Science and Technology Daejeon 305-701 Korea

This paper addresses mechanisms for active flapping and twisting of robotic wings and assesses flying effectiveness as a function of twist angle. Unlike the flapping motion of bird wings, insects generally make a twisting motion at the root of their wings while flapping, which makes it possible for them to hover in midair. This work includes the development of a Voice Coil Motor （VCM） because a flapping-wing air vehicle should be assembled with a compact actuator to decrease size and weight. A linkage mechanism is proposed to transform the linear motion of the VCM into the flapping and twisting motions of wings. The assembled flapping-wing air vehicle, whose weight is 2.86 g, produces an average positive vertical force proportional to the twist angle. The force saturates because the twist angle is mechanically limited. This work demonstrates the possibility of developing a flapping-wing air vehicle that can hover in midair using a mechanism that actively twists the roots of wings during flapping.

关键词： biomimetic flapping-wing air vehicle flapping twisting voice coil motor linkage mechanism

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A THREE-PARAMETER FAULT-DETECTION SOFTWARE RELIABILITY MODEL WITH THE UNCERTAINTY OF OPERATING ENVIRONMENTS

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Journal of Systems Science and Systems Engineering 2017年第1期26卷 121-132页

作者： Kwang yoon Song In Hong Chang Hoang Pham Department of Computer Science and Statistics Chosun University Gwangju 62022 Korea Department of Industrial and Systems Engineering Rutgers University NJ 08855-8018 USA

As requirements for system quality have increased, the need for high system reliability is also increasing. Soflnvare systems are extremely important, in terms of enhanced reliability and stability, for providing high quality services to customers. However, because of the complexity of software systems, soft-ware development can be time-consuming and expensive. Many statistical models have been developed in the past years to estimate soflnvare reliability. In this paper, we propose a new three-parameter fault-detection software reliability model with the uncertainty of operating environments. The explicit mean value function solution for the proposed model is presented. Examples are presented to illustrate the goodness-of-fit of the proposed model and several existing non-homogeneous Poisson process （NHPP） models based on three sets of failure data collected from software applications. The results show that the proposed model fits significantly better than other existing NHPP models based on three criteria such as mean squared error （MSE）, predictive ratio risk （PRR）, and predictive power （PP）.

关键词： Nonhomogeneous Poisson process ratio risk predictive power fault detection software reliability mean squared error predictive

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Atomic layer deposition for nanoscale oxide semiconductor thin film transistors:review and outlook

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International Journal of Extreme Manufacturing 2023年第1期5卷 153-180页

作者： Hye-Mi Kim Dong-Gyu Kim yoon-Seo Kim Minseok Kim Jin-seong Park Division of Materials Science and Engineering Hanyang University222 Wangsimni-roSeongdong-guSeoul 04763Republic of Korea

Since the first report of amorphous In–Ga–Zn–O based thin film transistors,interest in oxide semiconductors has *** offer high mobility,low off-current,low process temperature,and wide flexibility for compositions and ***,depositing oxide semiconductors using conventional processes like physical vapor deposition leads to problematic issues,especially for high-resolution displays and highly integrated memory *** approaches have limited process flexibility and poor conformality on structured *** layer deposition(ALD)is an advanced technique which can provide conformal,thickness-controlled,and high-quality thin film ***,studies on ALD based oxide semiconductors have dramatically increased *** so,the relationships between the film properties of ALD-oxide semiconductors and the main variables associated with deposition are still poorly understood,as are many issues related to *** this review,to introduce ALD-oxide semiconductors,we provide:(a)a brief summary of the history and importance of ALD-based oxide semiconductors in industry,(b)a discussion of the benefits of ALD for oxide semiconductor deposition(in-situ composition control in vertical distribution/vertical structure engineering/chemical reaction and film properties/insulator and interface engineering),and(c)an explanation of the challenging issues of scaling oxide semiconductors and ALD for industrial *** review provides valuable perspectives for researchers who have interest in semiconductor materials and electronic device applications,and the reasons ALD is important to applications of oxide semiconductors.

关键词： atomic layer deposition(ALD) oxide semiconductor thin film transistor(TFT)

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Adsorption properties of polycarboxylate ether-based superplasticizer on cement particles and their resultant dispersion

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Frontiers of Structural and Civil Engineering 2022年第4期16卷 506-514页

作者： Jinyoung yoon Byoung Il CHOI Jae Hong KIM Department of Structural Engineering Research Korea Institute of Civil Engineering and Building Technology(KICT)Goyang 10223Republic of Korea System Safety Research Department Korea Shipbuilding and Offshore EngineeringSeongnam 13591Republic of Korea Department of Civil and Environmental Engineering Korea Advanced Institute of Science and TechnologyDaejeon 34141Republic of Korea

The cement dispersion performance of a polycarboxylate(PCE)-based superplasticizer is highly related to their adsorption behaviors as a function of *** study evaluated effects of PCEs on rheological properties of cementitious ***,characteristics of PCEs were characterized via permeation chromatography(GPC)and Fourier-transform infrared spectrometry(FT-IR).The adsorption behavior of single and blended PCEs on cementitious composites was identified using total organic carbon analyzer(TOC).Based on the measurement of PCE adsorption,the changes of rheological properties of cementitious materials as well as the number of dispersed cement particles were characterized using a rheometer and laser spectroscopy,*** experimental results support the systematic mechanism of PCE adsorption,cement dispersion,and the decrease in viscosity of cementitious materials.

关键词： adsorption polycarboxylate superplasticizer rheology dispersion

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Characterization of Wollastonite Glass-ceramics Made from Waste Glass and Coal Fly Ash

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Journal of Materials Science & Technology 2013年第2期29卷 149-153页

作者： Soon-Do yoon Jong-Un Lee Jeong-Hwan Lee Yeon-Hum Yun Wang-Jung yoon School of Biotechnology and Chemical Engineering Chonnam National University Department of Energy & Resources Engineering Chonnam National University

The crystallization behavior of wollastonite glass-ceramics was investigated by means of X-ray diffraction （XRD） analysis and surface morphological observations, and the chemical compositions were evaluated by field emission-scanning electron microscopy （FE-SEM） and energy dispersive X-ray spectroscopy （EDS）. Various heat treatment temperatures （850, 900, 950, 1000 and 1050 ℃） were used to obtain glass-ceramics of the ideal wollastonite crystal phase as well as optimum mechanical properties and chemical durability. From XRD, FE-SEM and EDS, the crystallization of acicular crystal phase in the matrix was achieved at heat treatment temperature of 1000 and 1050 ℃, and wollastonite （CaSiO3） was found in the acicular type main crystal phase in the glass-ceramics. Various properties, such as density, compressive strength, bending strength and chemical durability were also examined. The mechanical properties of glass-ceramics obtained at the heat treatment temperature of 1000 and 1050 ℃ were superior to those obtained at the heat treatment temperature of 850 ℃.

关键词： Coal fly ash Waste glass Mechanical properties Glass-ceramics

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Primary signet ring cell carcinoma of the appendix:A rare case report and our 18-year experience

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World Journal of Gastroenterology 2008年第37期14卷 5763-5768页

作者： yoon Ho Ko Chan-Kwon Jung Soon Nam Oh Tae Hee Kim Hye Sung Won Jin Hyoung Kang,Hyung Jin Kim, Won Kyung Kang, seong Taek Oh, Young Seon Hong Jin Hyoung Kang Hyung Jin Kim Won Kyung Kang seong Taek Oh Young Seon Hong Departmentof Internal Medicine Kangnam St. Mary's hospital CatholicUniversity Seoul 137-701 South Korea Department of Hospital Pathology Kangnam St. Mary's hospital Catholic University Seoul137-70 l South Korea Department of Radiology Kangnam St. Mary'shospital Catholic University Seoul 137-701 South Korea Department of General Surgery Kangnam St. Mary's hospitalCatholic University Seoul 137-701 South Korea

Primary adenocarcinoma of the appendix is a rare malignancy that constitutes 〈 0.5% of all gastrointestinal neoplasms. Moreover, primary signet ring cell carc noma of the appendix is an exceedingly rare entity. We have encountered 15 cases of primary appendiceal cancer among 3389 patients who underwent appen- dectomy over the past 18 years. In the present report, we describe a rare case of primary signet ring cell carcinoma of the appendix with ovarian metastases and unresectable peritoneal dissemination occurring in a 67-year-old female patient. She underwent ap- pendectomy and bilateral salpingo-oophorectomy with a laparoscopy procedure. She then received palliative systemic chemotherapy with 12 cycles of oxaliplatin, 5-flurorouracil, and leucovorin （FOIFOX-4）. The patient currently is well without progression of disease 12 mo after beginning chemotherapy.

关键词： Appendiceal neoplasms Carcinoma Signet ring cell Chemotherapy

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The 5-year functional outcomes after radical prostatectomy： a real-life experience in Korea

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Asian Journal of Andrology 2010年第6期12卷 835-840页

作者： Sung Kyu Hong Seung Hwan Doo Dae Sung Kim Won Ki Lee Hong Zoo Park Ji Hyun Park seong Jin Jeong Cheol Yong yoon Seok-Soo Byun Sang Eun Lee Department of Urology Seoul National University Bundang Hospital Seongnam Kyunggi-do 463-707 Korea

We investigated the functional outcomes regarding erectile function and urinary continence up to 5 years following radical prostatectomy （RP） in a cohort of Korean men. We retrospectively analyzed the clinicopathologic data of 85 Korean men who received open uni- or bilateral nerve-sparing RP for clinically localized prostate cancer and were followed up for at least 5 years postoperatively. From medical records, patients＇ status regarding urinary and erectile function at baseline and postoperative followups after RP was assessed. At 24 and 60 months after RP, proportions of subjects continent （no pads used） were 89.4% and 97.6%, respectively （P = 0.007）. Excluding subjects （n = 24） who preoperatively reported having severe erectile dysfunction or lacked relevant informations, proportions of subjects capable of having vaginal intercourse regardless of erectile aid usage were 47.5% and 37.7% at 24 and 60 months from RP, respectively （P = 0.022）. Patient＇s age at surgery （P = 0.047） and salvage radiation therapy （P = 0.026） were observed to be significant predictors of having erections sufficient for intercourse at 60 months from RP in multivariate analysis. Our results showed that while patients＇ postoperative status regarding urinary continence at 2 years from RP is generally maintained or improved at 5 year point, erectile function was observed to significantly declined from 2 years to 5 years following RP. Such decline in erectile function following RP may be more significant among men who were relatively older at surgery or those who received salvage therapy during postoperative follow-ups.

关键词： impotence prostatectomy prostatic neoplasm urinary incontinence

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