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In?uence of Carbon Equivalent Value on the Weld Bead Bending Properties of High-Strength Low-Alloy Steel Plates

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Journal of Materials Science & Technology 2017年第4期33卷 321-329页

作者： Ki Hyuk Kim In jun Moon Ki Won Kim Ki Bong Kang Byung gyu Park Kwang Seok lee R&D Center of Dongkuk Steel Mill Co. Ltd Pohang 790-729 South Korea Korea Institute of Materials Science Implementation Research Division Materials Deformation Department 797 Changwondaero Changwon Gyeongnarn642-831 South Korea

The contribution of chemical compositions in terms of carbon equivalent value（CEV） on impending crack propagation during weld bead bend tests（WBBTs） was studied with five different high-strength lowalloy steel plates that underwent different rolling processes. The test showed that cracks developed at the weld joint, easily passed through the coarse-grain heat-affected zone（CGHAZ）, and finally were arrested within the heat-affected zone（HAZ）. An apparent decrease in the average crack length, which consequently indicated improvement in crack arrestability, was found with decreasing CEV. In addition,the relatively fine microstructure in the HAZ of low-CEV steel plates helped in preventing the crack from further propagation. Special emphasis was placed on the empirical expectation of critical CEV above which WBBT might fail.

关键词： Mechanical characterization Steel Welding Fracture Crack arrestability against bending

Sprinkle formulations——A review of commercially available products

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Asian Journal of Pharmaceutical Sciences 2020年第3期15卷 292-310页

作者： Han Sol lee Jeong-jun lee Myeong-gyu Kim Ki-Taek Kim Cheong-Weon Cho Dae-Duk Kim Jae-Young lee College of Pharmacy Chungnam National UniversityDaejeon 34134Republic of Korea Graduate School of Clinical Pharmacy CHA UniversityPocheon 11160Republic of Korea College of Pharmacy and Natural Medicine Research Institute Mokpo National UniversityJeonnam 58554Republic of Korea College of Pharmacy and Research Institute of Pharmaceutical Sciences Seoul National UniversitySeoul 08826Republic of Korea

Currently, sixty-five original sprinkle drug products are available in various dosage forms including tablets, powders, granules, immediate-release capsules, extended-release capsules, delayed-release capsules, and multiparticulate drug delivery systems. By sprinkling on soft food vehicles, these products provide dosing flexibility and convenience of administration, which potentially improve the compliance of patients with *** to these advantages, the growth of sprinkle products picked up since the 1990s, and several regulatory issues regarding this dosage form have been raised and *** this article, the types of sprinkle formulations were discussed by dividing them into seven categories, and the commercial products were summarized in terms of the drug substance, pharmaceutical excipients, storage conditions and administration methods. In addition, several US Food and Drug Administration guidelines related to the regulatory issues of sprinkle formulations were reviewed, which led to the conclusion that the future development of this promising dosage form demands integrated guidance for industry rather than scattered information in various documents.

关键词： Sprinkle formulation Soft food Geriatric Pediatric Dysphagia Guidance for industry

Medical Image Compression Method Using Lightweight Multi-Layer Perceptron for Mobile Healthcare Applications

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Computers, Materials & Continua 2022年第1期70卷 2013-2029页

作者： Taesik lee Dongsan jun Sang-hyo Park Byung-gyu Kim jungil Yun Kugjin Yun Won-Sik Cheong Kyungnam University Changwon51767Korea Kyungpook National University Daegu41566Korea Sookmyung Women’s University Seoul04310Korea Electronics and Telecommunications Research Institute Daejeon34129Korea

As video compression is one of the core technologies required to enable seamless medical data streaming in mobile healthcare applications,there is a need to develop powerful media codecs that can achieve minimum bitrates while maintaining high perceptual *** Video Coding(VVC)is the latest video coding standard that can provide powerful coding performance with a similar visual quality compared to the previously developed method that is High Efficiency Video Coding(HEVC).In order to achieve this improved coding performance,VVC adopted various advanced coding tools,such as flexible Multi-type Tree(MTT)block structure which uses Binary Tree(BT)split and Ternary Tree(TT)***,VVC encoder requires heavy computational complexity due to the excessive Ratedistortion Optimization(RDO)processes used to determine the optimalMTT block *** this paper,we propose a fast MTT decision method with two Lightweight Neural Networks(LNNs)using Multi-layer Perceptron(MLP),which are applied to determine the early termination of the TT split within the encoding *** results show that the proposed method significantly reduced the encoding complexity up to 26%with unnoticeable coding loss compared to the VVC TestModel(VTM).

关键词： Mobile healthcare video coding complexity reduction multilayer perceptron VVC intra prediction multi-type tree ternary tree neural network

Nanograin network memory with reconfigurable percolation paths for synaptic interactions

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Light(Science & Applications) 2023年第6期12卷 1040-1050页

作者： Hoo-Cheol lee jungkil Kim Ha-Reem Kim Kyoung-Ho Kim Kyung-jun Park Jae-Pil So jung Min lee Min-Soo Hwang Hong-gyu Park Department of Physics Korea UniversitySeoul 02841Republic of Korea Department of Physics Jeju National UniversityJeju 63243Republic of Korea Department of Physics Chungbuk National UniversityCheongju 28644Republic of Korea

The development of memory devices with functions that simultaneously process and store data is required for efficient *** achieve this,artificial synaptic devices have been proposed because they can construct hybrid networks with biological neurons and perform neuromorphic ***,irreversible aging of these electrical devices causes unavoidable performance *** several photonic approaches to controlling currents have been suggested,suppression of current levels and switching of analog conductance in a simple photonic manner remain ***,we demonstrated a nanograin network memory using reconfigurable percolation paths in a single Si nanowire with solid core/porous shell and pure solid core *** electrical and photonic control of current percolation paths enabled the analog and reversible adjustment of the persistent current level,exhibiting memory behavior and current suppression in this single nanowire *** addition,the synaptic behaviors of memory and erasure were demonstrated through potentiation and habituation *** habituation was achieved using laser illumination on the porous nanowire shell,with a linear decrease in the postsynaptic ***,synaptic elimination was emulated using two adjacent devices interconnected on a single ***,electrical and photonic reconfiguration of the conductive paths in Si nanograin networks will pave the way for next-generation nanodevice technologies.

关键词： electrical percolation network

Influences of the Welding Heat Input and the Repeated Repair Welding on Ti–3Al–2.5V Titanium Alloy

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Acta Metallurgica Sinica(English Letters) 2015年第6期28卷 684-691页

作者： Hui-jun Yi Yong-jun lee Kwang-O lee School of Mechanical Engineering Pusan National University

The primary purpose of this study was to determine the effects of gas tungsten arc welding heat input on the high-temperature tensile properties, toughness, and microstructural features of titanium alloy Ti-3A1-2.5V. The secondary objective was to examine the effect of the repeated repair welding on the properties of the alloy. It was also found that the mechanical properties progressively decreased with increasing the repair welding cycles, especially in the case of the weldment after the first welding repair. It was observed that the sizes of the acicular and prior β grain boundaries as well as the volume fraction of the acicular phases increased with increasing the welding heat input. In addition, the amount and size of the acicular a1 phases were found to increase with increasing the repair welding cycles.

关键词： Ti-3AI-2.5V Repair welding Heat input Tensile properties Microstructure

Biclustering of ARMA time series

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第12期11卷 959-965页

作者： Jeonghwa lee Chi-Hyuck jun Department of Industrial and Management Engineering Pohang University of Science and Technology

Biclustering is a method of grouping objects and attributes simultaneously in order to find multiple hidden *** dealing with a long time series,there is a low possibility of finding meaningful clusters of whole time ***,we may find more significant clusters containing partial time sequence by applying a biclustering *** paper proposed a new biclustering algorithm for time series data following an autoregressive moving average (ARMA) *** assumed the plaid model but modified the algorithm to incorporate the sequential nature of time series *** maximum likelihood estimation (MLE) method was used to estimate coefficients of ARMA in each *** applied the proposed method to several synthetic data which were generated from different ARMA *** from the experiments showed that the proposed method compares favorably with other biclustering methods for time series data.

关键词： Biclustering Time series Autoregressive moving average (ARMA) Maximum likelihood estimation (MLE)

Direct high-resolution X-ray imaging exploiting pseudorandomness

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Light(Science & Applications) 2023年第5期12卷 776-788页

作者： KyeoReh lee jun Lim Su Yong lee YongKeun Park Department of Physics Korea Advanced Institute of Science and TechnologyDaejeon 34141Republic of Korea KAIST Institute for Health Science and Technology Korea Advanced Institute of Science and TechnologyDaejeon 34141Republic of Korea Pohang Accelerator Laboratory Pohang University of Science and TechnologyPohangKyungbuk 37637Republic of Korea Tomocube Inc Daejeon 34051Republic of Korea

Owing to its unique penetrating power and high-resolution capability,X-ray imaging has been an irreplaceable tool since its *** the significance,the resolution of X-ray imaging has largely been limited by the technical difficulties on X-ray lens *** lensless imaging methods have been proposed,but are yet relying on multiple measurements or additional constraints on measurements or *** we present coherent specklecorrelation imaging(CSI)using a designed X-ray *** has no prerequisites for samples or ***,from a single shot measurement,the complex sample field is retrieved based on the pseudorandomness of the speckle intensity pattern,ensured through a *** achieve a spatial resolution of 13.9 nm at 5.46 keV,beating the feature size of the diffuser used(300 nm).The high-resolution imaging capability is theoretically explained based on fundamental and practical *** expect the CSI to be a versatile tool for navigating the unexplored world of nanometer.

关键词： resolution speckle replace

Adaptive Consistent Management to Prevent System Collapse on Shared Object Manipulation in Mixed Reality

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Computers, Materials & Continua 2023年第4期75卷 2025-2042页

作者： jun lee Hyun Kwon Department of Game Software Hoseo UniversityAsan-siKorea Department of Artificial Intelligence and Data Science Korea Military AcademySeoulKorea

A concurrency control mechanism for collaborative work is akey element in a mixed reality environment. However, conventional lockingmechanisms restrict potential tasks or the support of non-owners, thusincreasing the working time because of waiting to avoid conflicts. Herein, wepropose an adaptive concurrency control approach that can reduce conflictsand work time. We classify shared object manipulation in mixed reality intodetailed goals and tasks. Then, we model the relationships among goal,task, and ownership. As the collaborative work progresses, the proposedsystem adapts the different concurrency control mechanisms of shared objectmanipulation according to the modeling of goal–task–ownership. With theproposed concurrency control scheme, users can hold shared objects andmove and rotate together in a mixed reality environment similar to realindustrial sites. Additionally, this system provides MS Hololens and Myosensors to recognize inputs from a user and provides results in a mixed realityenvironment. The proposed method is applied to install an air conditioneras a case study. Experimental results and user studies show that, comparedwith the conventional approach, the proposed method reduced the number ofconflicts, waiting time, and total working time.

关键词： Mixed reality upper body motion recognition shared object manipulation adaptive task concurrency control

Intrauterine midgut volvulus without malrotation:Diagnosis from the 'coffee bean sign'

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World Journal of Gastroenterology 2008年第9期14卷 1456-1458页

作者： jun Seok Park Seong Jae Cha Beom gyu Kim Yong Seok Kim Yoo Shin Choi In Taik Chang Gwang jun Kim Woo Seok lee Gi Hyeon Kim Department of Surgery College of MedicineChung-Ang University Seoul 156-755Korea Department of Obstetrics and Gynecology College of Medicine Chung-Ang UniversityKorea Department of Radiology College of Medicine Chung-Ang University Seoul 156-755Korea

Fetal midgut volvulus is quite rare, and most cases are associated with abnormalities of intestinal rotation or fixation. We report a case of midgut volvulus without malrotation, associated with a meconium pellet, during the gestation period. This 2.79 kg, 33-wk infant was born via a spontaneous vaginal delivery caused by preterm labor. Prenatal ultrasound showed dilated bowel loops with the appearance of a 'coffee bean sign'. This patient had an unusual presentation with a distended abdomen showing skin discoloration. An emergency laparotomy revealed a midgut volvulus and a twisted small bowel, caused by complicated meconium ileus. Such nonspecific prenatal radiological signs and a low index of suspicion of a volvulus during gestation might delay appropriate surgical management and result in ischemic necrosis of the bowel. Preterm labor, specific prenatal sonographic findings (for example, the coffee bean sign) and bluish discoloration of the abdominal wall could suggest intrauterine midgut volvulus requiring prompt surgical intervention.

关键词： Midgut volvulus Coffee bean sign Meconium ileus