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Easy calibration method of vision system for in-situ measurement of strain of thin films

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中国有色金属学会会刊：英文版 2009年第B9期19卷 243-249页

作者： Jun-Hyub park Dong-Joong KANG Myung-soo SHIN sung-Jo LIM Son-Cheol YU Kwang-soo LEE Jong-Eun HA sung-Hoon CHOA Department of Mechatronics Engineering Tongmyong University School of Mechanical Engineering Pusan National University Department of Automotive Engineering Hoseo University Department of Automotive Engineering Seoul National University of Technology Department of Nano/IT Engineering Seoul N ational University of Technology

An easy calibration method was presented for in-situ measurement of displacement in the order of nanometer during micro-tensile test for thin films by using CCD camera as a sensing device. The calibration of the sensing camera in the system is a central element part to measure displacement in the order of nanometer using images taken with the camera. This was accomplished by modeling the optical projection through the camera lens and relative locations between the object and camera in 3D space. A set of known 3D points on a plane where the film is located on is projected to an image plane as input data. These points, known as a calibration points, are then used to estimate the projection parameters of the camera. In the measurement system of the micro-scale by CCD camera, the calibration data acquisition and one-to-one matching steps between the image and 3D planes need precise data extraction procedures and repetitive user's operation to calibrate the measuring devices. The lack of the robust image feature extraction and easy matching prevent the practical use of these methods. A data selection method was proposed to overcome these limitations and offer an easy and convenient calibration of a vision system that has the CCD camera and the 3D reference plane with calibration marks of circular type on the surface of the plane. The method minimizes the user's intervention such as the fine tuning of illumination system and provides an efficient calibration method of the vision system for in-situ axial displacement measurement of the micro-tensile materials.

关键词：标定方法视觉系统原位测试应变薄膜松

Fabrication of High-Density Out-of-Plane Microneedle Arrays with Various Heights and Diverse Cross-Sectional Shapes

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Nano-Micro Letters 2022年第2期14卷 60-78页

作者： Hyeonhee Roh Young Jun Yoon Jin soo park Dong-Hyun Kang Seung Min Kwak Byung Chul Lee Maesoon Im Brain Science Institute Korea Institute of Science and Technology(KIST)Seoul 02792South Korea Division of Electrical Engineering College of EngineeringKorea UniversitySeoul 02841South Korea Micro/Nano Fabrication Center KISTSeoul 02792South Korea Division of Bio‑Medical Science&Technology KIST SchoolUniversity of Science&Technology(UST)Seoul 02792South Korea

Out-of-plane microneedle structures are widely used in various applications such as transcutaneous drug delivery and neural signal recording for brain machine *** work presents a novel but simple method to fabricate high-density silicon(Si)microneedle arrays with various heights and diverse cross-sectional shapes depending on photomask pattern *** proposed fabrication method is composed of a single photolithography and two subsequent deep reactive ion etching(DRIE)***,a photoresist layer was patterned on a Si substrate to define areas to be etched,which will eventually determine the final location and shape of each individual ***,the 1st DRIE step created deep trenches with a highly anisotropic etching of the Si ***,the photoresist was removed for more isotropic etching;the 2nd DRIE isolated and sharpened microneedles from the predefined trench *** on diverse photomask designs,the 2nd DRIE formed arrays of microneedles that have various height distributions,as well as diverse cross-sectional shapes across the *** these simple steps,high-aspect ratio microneedles were created in the high density of up to 625 microneedles mm^(-2)on a Si *** tests showed a small force as low as~172μN/microneedle is required for microneedle arrays to penetrate the dura mater of a mouse *** demonstrate a feasibility of drug delivery application,we also implemented silk microneedle arrays using molding *** fabrication method of the present study is expected to be broadly applicable to create microneedle structures for drug delivery,neuroprosthetic devices,and so on.

关键词： Microneedle Various heights Cross-sectional shapes Isotropic etch Deep reactive ion etching

MXene ink hosting zinc anode for high performance aqueous zinc metal batteries

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Journal of Energy Chemistry 2023年第1期76卷 187-194,I0005页

作者： Jae Min park Milan Jana Sang Ha Baek Taehun Kang Peixun Xiong Jeong Hee park Jun soo Kim Ali Shayesteh Zeraati Mikhail Shekhirev Paul V.Braun Yury Gogotsi Ho Seok park School of Chemical Engineering Sungkyunkwan University2066SeoburoJangan-guSuwon 440-746Republic of Korea Department of Chemical and Petroleum Engineering University of Calgary2500 University Dr NWCalgary T2N 1N4Canada Department of Materials Science and Engineering Materials Research LaboratoryBeckman Institute for Advanced Science and TechnologyUniversity of Ilinois at Urbana-ChampaignUrbanaIL61801USA A.J.Drexel Nanomaterials Institute and Department of Materials Science and Engineering Drexel UniversityPhiladelphiaPA 19104USA SKKU Institute of Energy Science and Technology(SIEST) Sungkyunkwan University2066SeoburoJangan-guSuwon 440-746Republic of Korea SKKU Advanced Institute of Nano Technology(SAINT) Sungkyunkwan University 2066SeoburoJangan-guSuwon 440-746Republic of Korea

Despite the safety,low cost,and high theoretical capacity(820 mA h g^(-1))of Zn metal anodes,the practical application of aqueous Zn metal batteries remains a critical challenge due to the Zn dendrite growth,corrosion,and hydrogen evolution ***,we demonstrate the MXene ink hosting Zn metal anodes(MX@Zn)for high-performance and patternable Zn metal full *** as-designed MX@Zn electrode is more facile and reversible than bare Zn and CC@Zn,as verified by better cyclic stability and lower overpotentials of symmetric cells with the plating capacity of 0.05 mA h cm^(-2)at 0.1 m A cm^(-2)and of 1 m A h cm^(-2)at 1 m A cm^(-2).The MX@Zn|MnO_(2)full cells deliver a high specific capacity of 281.9 m A h g^(-1),91.5%of the theoretical capacity,achieving 50%capacity retention from 60 mA g^(-1)to 300 mA g^(-1)and 79.7%of initial capacity after 200 ***,the patterned devices based on the MX@Zn electrode achieve high energy and power densities of 348.57 Wh kg^(-1)and 1556 W kg^(-1),respectively,along with a capacity retention of 64%and Coulombic efficiency of 99%over 500 *** high performance of MX@Zn is attributed to the high electrical conductivity and hydrophilicity of MXene and rapid ion diffusion through the 3D interconnected porous channels.

关键词： MXene ink Zinc anode Metal batteries Patterning Electrodeposition

Dynamic deformation behavior and microstructural evolution during high-speed rolling of Mg alloy having non-basal texture

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Journal of Materials Science & Technology 2019年第4期35卷 473-482页

作者： Sang-Hoon Kim Jeong Hun Lee Chong soo Lee Jonghun Yoon sung Hyuk park School of Materials Science and Engineering Kyungpook National University Ulsan Regional Division Korea Institute of Industrial Technology Graduate Institute of Ferrous Technology Pohang University of Science and Technology Department of Mechanical Engineering Hanyang University

The dynamic deformation behaviors and resultant microstructural variations during high-speed rolling(HSR) of a Mg alloy with a non-basal texture are investigated. To this end, AZ31 alloy samples in which the basal poles of most grains are predominantly aligned parallel to the transverse direction(TD) are subjected to hot rolling with different reductions at a rolling speed of 470 m/min. The initial grains with a TD texture are favorable for {10–12} twinning under compression along the normal direction(ND); as a result, {10–12} twins are extensively formed in the material during HSR, and this consequently results in a drastic evolution of texture from the TD texture to the ND texture and a reduction in the grain size. After the initial grains are completely twinned by the {10–12} twinning mechanism, {10–11} contraction twins and {10–11}-{10–12} double twins are formed in the {10–12} twinned grains by further *** the contraction twins and double twins have crystallographic orientations that are favorable for basal slip during HSR, dislocations easily accumulate in these twins and fine recrystallized grains nucleate in the twins to reduce the increased internal strain energy. Until a rolling reduction of 20%, {10–12}twinning is the main mechanism governing the microstructural change during HSR, and subsequently,the microstructural evolution is dominated by the formation of contraction twins and double twins and the dynamic recrystallization in these twins. With an increase in the rolling reduction, the average grain size and internal strain energy of the high-speed-rolled(HSRed) samples decrease and the basal texture evolves from the TD texture to the ND texture more effectively. As a result, the 80% HSRed sample, which is subjected to a large strain at a high strain rate in a single rolling pass, exhibits a fully recrystallized microstructure consisting of equiaxed fine grains and has an ND basal texture without a TD texture component.

关键词： Magnesium alloy High-speed rolling Texture Dynamic recrystallization Twinning

Synchronous quintuple primary gastrointestinal tract malignancies: Case report

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World Journal of Gastroenterology 2017年第1期23卷 173-177页

作者： soo-Hong Kim Byung-soo park Hyun sung Kim Jae Hun Kim Department of Surgery Pusan National University Yangsan Hospital Department of Surgery Pusan National University Hospital

Multiple primary malignancy is defined as two or more malignancies detected in an individual person. In particular, synchronous quintuple primary malignancy is extremely rare. A 52-year-old male with anal pain and intermittent blood-tinged stool was diagnosed with malignancies in the stomach, jejunum, ascending colon, transverse colon and rectum. He underwent a subtotal gastrectomy, segmental resection of the jejunum and total protocolectomy with end ileostomy. The postoperative pathologic findings were moderate differentiated gastric adenocarcinoma(pT1b N0M0, p StageⅠA), combined adenocarcinoma and neuroendocrine carcinoma of the jejunum(pT3N0M0, p StageⅡA), three mucinous adenocarcinoma of the ascending colon(pT3N0M0, pStageⅡA), transverse colon(pT1N0M0, p StageⅠ) and rectum(pT3N1 a M0, p StageⅢB). The tumors did not lack MLH-1 and MSH-2 expression, as the markers(bat26, D5S346, bat25, D2S123) suggest MSI-H presence. Adjuvant chemoradiotherapy was started according to regimen, FOLFOX 4 for advanced rectal cancer. Six years post-operation, the patient is currently attending regular follow-ups without recurrence or metastasis.

关键词：小肠瘤胃瘤同步五倍的主要癌症冒号瘤

Corrugated surface microparticles with chitosan and levofloxacin for improved aerodynamic performance

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Asian Journal of Pharmaceutical Sciences 2023年第3期18卷 146-158页

作者： Chang-soo Han Ji-Hyun Kang Eun hye park Hyo-Jung Lee So-Jeong Jeong Dong-Wook Kim Chun-Woong park College of Pharmacy Chungbuk National UniversityCheongju 28160Republic of Korea School of Pharmacy Jeonbuk National UniversityJeonju 54896Republic of Korea College of Pharmacy Wonkwang UniversityIksan 54538Republic of Korea

Corrugated surface microparticles comprising levofloxacin(LEV),chitosan and organic acid were prepared using the 3-combo spray drying *** amount and the boiling point of the organic acid affected the degree of *** this study,we tried to improve the aerodynamic performance and increase aerosolization by corrugated surface microparticle for lung drug delivery efficiency as dry powder ***175 L20 prepared with 175 mmol propionic acid solution was corrugated more than HMF175 L20 prepared with 175 mmol formic acid *** ACI and PIV results showed a significant increase in aerodynamic performance of corrugated *** FPF value of HMP175 L20 was 41.3%±3.9%compared with 25.6%±7.7%of HMF175 *** microparticles also showed better aerosolization,decreased x-axial velocity,and variable *** dissolution of drug formulationswas observed in *** administered to the lungs achieved higher LEV concentrations in the lung fluid than high doses administered *** modification in the polymer-based formulation was achieved by controlling the evaporation rate and improving the inhalation efficiency of DPIs.

关键词： Chitosan Organic acid Levofloxacin Corrugated surface Aerodynamic performance

Optimistic performance of carbon-free hydrazine fuel cells based on controlled electrode structure and water management

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Journal of Energy Chemistry 2020年第12期29卷 175-181页

作者： Hongsun Hwang Sujik Hong Do-Hyeong Kim Moon-sung Kang Jin-soo park sunghyun Uhm Jaeyoung Lee Electrochemical Reaction and Technology Laboratory(ERTL) School of Earth Sciences and Environmental EngineeringGwangju Institute of Science and Technology(GIST)Cwangju 61005Republic of Korea Ertl Center for Electrochemistry and Catalysis Gwangju Institute of Science and Technology(GIST)Gwangju 61005Republic of Korea Department of Green Chemical Engineering Sangmyung UniversityCheonanChungnam 31066Republic of Korea Plant Engineering Center Institute for Advanced EngineeringYongin 17180Republic of Korea

In this study, we first attempted to discover the optimal configuration of membrane-electrode assemblies(MEAs) used to achieve a high performance of direct hydrazine fuel cells(DHFCs). We have investigated the effect of water management and the electrode thickness on the performance of DHFCs, depending on the hydrophobicity of the gas diffusion layers in the cathode and the catalyst loading in the anode with the carbon-supported Ni, synthesized by a polyol process. With the optimal water management and electrode thickness, the MEA constructed using the as-prepared Ni/C anode catalyst containing the metallic and low oxidative state and ultra-low Pt loading cathode reduced the ohmic resistance and mass transfer limitation in the current-voltage curves observed for the alkaline DHFC, achieving an impressive power performance over 500 mW cm^(–2).

关键词： Fuel cell Hydrazine Alkaline media Membrane-electrode assembly

Manipulating the nonlinearity of transition-metal dichalcogenide polaritons

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Light(Science & Applications) 2023年第12期12卷 2540-2542页

作者： Min-soo Hwang Hong-Gyu park Department of Physics and Astronomy and Institute of Applied PhysicsSeoul National UniversitySeoul 08826Republic of Korea

The lithographically designed potential wells in monolayer WS2 microcavities are utilized to manipulate nonlinear transition-metal dichalcogenide polaritons and enhance the polariton-reservoir interaction strength.

关键词： strength. polar transition

Underwater endoscopic mucosal resection for neoplasms in the pyloric ring of the stomach: Four case reports

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World Journal of Clinical Cases 2020年第14期8卷 3050-3056页

作者： Dong Hyun Kim Seon-Young park Chang Hwan park Hyun soo Kim sung Kyu Choi Division of Gastroenterology Department of Internal MedicineChonnam National University Hospital and Medical SchoolGwangju 61469South Korea

BACKGROUND Tumors located in the pylorus are technically more complex to resect by endoscopic resection,as the anatomical characteristics of this region can affect the adequate assessment of margins and performance of the *** reported the results of underwater endoscopic mucosal resection(UEMR)of benign mucosal neoplasms located in the pyloric *** SUMMARY This case series describes 4 patients with 4 mucosal neoplasms located in the pyloric *** diameter of each neoplasm was less than 15 *** performed UEMR for the *** immersion enabled slight floating of the lesions,resulting in easy *** achieved en bloc resection with a snare and electrosurgical *** procedure were performed within 3 min without adverse *** examination showed low-grade dysplasia with clear resection margins in one case and hyperplastic polyps in three *** UEMR can be an effective and safe treatment method for neoplasms in the gastric pyloric ring.

关键词： Duodenoscopy Endoscopic mucosal resection Neoplasm Pylorus Stomach Case report