检索结果-南通市图书馆

Chinese Journal of Polymer Science 2019年第9期37卷 866-874页

作者： Chang-Geun Chae Joonkeun Min In-gyu Bak jae-Suk Lee School of Materials Science and Engineering Gwangju Institute of Science and Technology (GIST)

A rod-rod diblock copolymer (diBCP), poly(3-hexylthiophene)-block-poly(furfuryl isocyanate)(P3HT-b-PFIC), was synthesized through the anionic polymerization with an oxyanionic macroinitiator of P3HT. The properties of the diBCP (molecular weight, dispersity, composition, thermal stability, UV-visible absorption, and thin film morphology) were determined by various analytical methods. P3HT-b-PFIC was blended with C60 in a toluene solution to prepare a thin film of binary electron donor/acceptor system. Such blending enabled partial conjugation of the two components by the Diels-Alder reaction between furan and C60 at 60℃ for 3 h;the mixture was then spin-cast as a thin film, and annealed at 250℃ for 24 h. Tapping-mode atomic force microscopy (AFM) revealed that P3HT and C60 domains had nanoscale interfaces without a large phase segregation. This result indicated that the microphase separation of C60-functionalized P3HT-b-PFIC preserved even at high temperature provided free C60 molecules with channels to diffuse on the sides of P3HT domain, thus preventing the macroscopic crystallization of free C60 through the interfacial stabilization.

关键词： Rod-rod diblock copolymer Poly(3-hexylthiophene)-block-poly(furfuryl isocyanate) C60 Diels-Alder reaction Nanoscale interfaces

Worldwide experiences of endoscopic submucosal dissection:Not just Eastern acrobatics

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2011年第21期17卷 2611-2617页

作者： Kwang Bum Cho Won Joong jeon jae J Kim Division of Gastroenterology Department of Internal MedicineKeimyung University School of Medicine Department of Internal Medicine Cheju Halla General Hospital Department of Medicine Samsung Medical CenterSungkyunkwan University School of Medicine

The high incidence of gastric cancer has led to the initiation of cancer screening *** a result,the number of early gastric cancer cases has increased and consequentially,the cancer mortality rate has ***,the development of minimally invasive endoscopic treatment has been introduced for these early *** submucosal dissection(ESD) is now recognized as one of the preferred treatment modalities for premalignant gastrointestinal epithelial lesions and early gastric cancer without lymph node *** review the results of ESD including experiences in Japan and Korea,as well as western countries.

关键词： Experiences Endoscopic submucosal dissection

Pedestrian walking characteristics at stairs according to width change for application of piezoelectric energy harvesting

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Central South University 2012年第3期19卷 764-769页

作者： YI Mi-hui NA Wook-jung HONG Won-hwa jeon gyu-yeob School of Architecture and Civil Engineering Kyungpook National University Daegu 702-701 South Korea Department of Architecture Jeju National University Jeju 690-756 South Korea

This work aims at finding pedestrian walking characteristics at U-type stairs according to the width change of stairs and appropriate spot for installing piezoelectric energy *** number of pedestrian at two kinds of stairs(one is stairs with 1.5 m in width and the other is stairs with 3 m in width) was estimated by calculating the number of steps on the stairs by a zone which is divided into 30 cm×30 *** result shows high density in the middle in the case of narrow stairs but traffic is concentrated on stair inside(pillar side) in stairs with large *** conclusion,the location for installation of piezoelectric energy harvesting system should be considered differently on stairs width and the number of installation depends on total expected traffic and the expected traffic for a device.

关键词： piezoelectric energy harvesting pedestrian walking human power traffic distribution

Pedicled abdominal flap using deep inferior epigastric artery perforators for forearm reconstruction: A case report

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2024年第4期12卷 828-834页

作者： jae Hyung jeon Kyung Wook Kim Hong Bae jeon Department of Plastic and Reconstructive Surgery Dankook University HospitalCheonan 31116ChungnamSouth Korea Department of Orthopaedic Surgery Dankook University HospitalDankook University College of MedicineCheonan 31116ChungnamSouth Korea Department of Plastic and Reconstructive Surgery Dankook University HospitalDankook University College of MedicineCheonan 31116ChungnamSouth Korea

BACKGROUND Pedicled abdominal flaps are a widely used surgical technique for forearm reconstruction in patients with soft tissue ***,some drawbacks include restricted flap size,partial flap loss,and donor-site *** address these concerns,we present a case of a pedicled abdominal flap using the deep inferior epigastric artery perforators(DIEP)for forearm reconstruction in a patient with a large soft tissue *** SUMMARY A 46-year-old male patient was admitted to our hospital with forearm injury caused by a pressing machine.A 15 cm×10 cm soft tissue defect with complete rupture of the ulnar side structures of the forearm was *** week after orthopedic management of the neurovascular injury and fractures using the first stage of Masquelet technique,the patient was referred to the plastic and recon-structive surgery department for wound *** debridement and negative-pressure wound therapy revealed a 20 cm×15 cm soft tissue defect.A pedicle abdominal flap with the DIEP was used to cover the *** weeks later,the flap was detached from the abdomen,and the abdominal defect was directly ***,the second stage of Masquelet technique was performed at the fracture site at week ***,all donor and recipient sites healed without complications,such as flap dehiscence,infection,hematoma,or *** site osteosynthesis was achieved without *** Pedicled abdominal flap using the DIEP provides a reliable option for forearm reconstruction in patients with large soft tissue defects.

关键词： Forearm injury Open fracture reduction Perforator flap Deep inferior epigastric artery perforators Case report

Biomass seaweed-derived n itrogen self-doped porous carb on anodes for sodium-ion batteries:Insights into the structure and electrochemical activity

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2022年第1期31卷 286-295,I0008页

作者： Chenrayan Senthil jae Woo Park Nitheesha Shaji gyu Sang Sim Chang Woo Lee Department of Chemical Engineering(Integrated Engineering)&Center for the SMART Energy Platform College of EngineeringKyung Hee University1732 Deogyeong-daeroCihuengYonginGyeonggi 17104South Korea

Sustainable transformation and efficient utilization of biomasses and their derived materials are environ-mentally as well as economically compliant *** seaweed-derived nitrogen self-doped porous carbon with tailored surface area and pore structures are prepared through carb on izatio n and *** in fluence of carb on ization temperature on morphology,surface area,and heteroatom dopants are investigated to optimize sodium-ion storage ***-derived nitrogen selfdoped activated carbon(SAC)as anode materials for sodium-ion batteries exhibits remarkable reversible capacity of 303/192 mAh g^(-1) after 100/500 cycles at current densities of 100/200 mA g^(-1) respectively,and a good rate *** interconnected and porous conducting nature along with the heteroatom dopant role in creating defective sites and charge stabilization are favorable for ion storage and diffusion and electron transport,indicating the electrodes can offer improved electrochemical *** addition,post-mortem analysis of the cycled carbon electrodes through ex-situ tools demonstrates the sodium-ion storage mechanism.

关键词： Biomass Heteroatom self-doping Porous carbon Anode Sodium-ion batteries Post-mortem ex-situ analysis

High-resolution subsurface articular cartilage imaging based on Fourier-domain common-path optical coherence tomography

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2010年第2期8卷 167-169页

作者： jae-Ho Han Xuan Liu Jin U. Kang Chul gyu Song Department of Electrical and Computer Engineering Johns Hopkins University 3400 N. Charles St. Baltimore MD 21218 USA Division of Electronics and Information Engineering Center for Advanced Image and Information Technology Chonbuk National University Deokjin-Dong Jeonju 561-756 Korea

We demonstrate the subsurface imaging of an articular cartilage using Fourier-domain common-path optical coherence tomography. The bare fiber probe integrated with a hypodermic needle provides the rigidness required to perform lateral scanning with less microscale bending. By submerging both the probe and the specimen into saline solution, we not only reduce the beam divergence, but also increase the signal-to-noise ratio compared with the measurement in free space. Our system can differentiate the characteristic cartilage zones and identity various micro-structured defects in an ex vivo chicken knee cartilage, thus demonstrating that it could be used to conduct early arthritis diagnosis and intraoperative endo-microscopy.

关键词： High-resolution subsurface articular cartilage imaging based on Fourier-domain common-path optical coherence tomography

Blood flow Interpretation in Femoral Pseudoaneurysm

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2013年第3期22卷 229-233页

作者： Sang-Ho Suh Young Ho Choi Hyoung-Ho Kim Min-gyu jeon Deog-Hee Doh Dept. of Mechanical Engineering Soongsil University Department of Radiology Seoul Nat'l University Boramae Hospital Graduate School Korea Maritime Univ. Division of Mechanical and Energy Systems Engineering Korea Maritime University

A femoral artery pseudoaneurysm is one complication of vascular intervention, and the incidence is increasing. Early management is then needed to avoid potential dangers from it. It differs from a true aneurysm in that it doesn't include any component of the vascular wall, and is not studied as much as a true aneurysm. Here, a model of a femoral pseudoaneurysm was made and a Computational Fluid Dynamics(CFD) simulation was verified with PIV experiment. Afterwards, a CFD simulation with two different models was performed to look for any findings which may help in developing new treatment methods.

关键词： Femoral Artery, Pseudoaneurysm, Numerical and PIV experimental Interpretation

Performance Improvements in Temperature Reconstructions of 2-D Tunable Diode Laser Absorption Spectroscopy(TDLAS)

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2016年第1期25卷 84-89页

作者： Doo-Won Choi Min-gyu jeon Gyeong-Rae Cho Takahiro Kamimoto Yoshihiro Deguchi Deog-Hee Doh Tokushima University 2-1 Minamijyosanjima TokushimaJapan Korea Maritime&Ocean University Dongsam-dong 1 Youngdo-guBusan 606-791Korea

Performance improvement was attained in data reconstructions of 2-dimensional tunable diode laser absorption spectroscopy(TDLAS). Multiplicative Algebraic Reconstruction Technique(MART) algorithm was adopted for data reconstruction. The data obtained in an experiment for the measurement of temperature and concentration fields of gas flows were used. The measurement theory is based upon the Beer-Lambert law, and the measurement system consists of a tunable laser, collimators, detectors, and an analyzer. Methane was used as a fuel for combustion with air in the Bunsen-type burner. The data used for the reconstruction are from the optical signals of 8-laser beams passed on a cross-section of the methane flame. The performances of MART algorithm in data reconstruction were validated and compared with those obtained by Algebraic Reconstruction Technique(ART) algorithm.

关键词： Data Reconstruction TDLAS MART ART

Effectiveness of gastric cancer screening programs in South Korea:Organized vs opportunistic models

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2013年第5期19卷 736-741页

作者： Beom Jin Kim Chae Heo Byoung Kwon Kim jae Yeol Kim jae gyu Kim Department of Internal Medicine Chung-Ang University College of MedicineHeukseok-dongDongjak-guSeoul 156-755South Korea Department of Pathology Green Cross Reference Laboratory314 Pojung-dongGiheung-guYongin-siKyunggi-do 446-913South Korea

AIM:To investigate the outcome and effectiveness of two screening programs,National Cancer Screening Program(NCSP)and opportunistic screening(OS),for the detection of gastric cancer. METHODS:A total of 45 654 subjects underwent upper endoscopy as part of the NCSP or OS at the Chung-Ang University Healthcare System in Korea between January 2007 and December *** study population was comprised of subjects over the age of 40 *** specifically,subjects who took part in the NCSP were Medicaid recipients and beneficiaries of the National Health Insurance *** photo-graphs from the endoscopies diagnosed as gastric cancer were reviewed by two experienced endoscopists. RESULTS:The mean age of the screened subjects was 55 years for men and 54 years for women.A total of 126 cases(0.28%)of gastric cancer were detected from both screening programs;100 cases(0.3%)from NCSP and in 26 cases(0.2%)from *** proportion of early gastric cancer(EGC)detected in NCSP was higher than that in OS(74.0%vs 53.8%,P=0.046). Among the 34 416 screenees in NCSP,6585(19.1%) underwent upper endoscopy every other year as *** the 11 238 screenees in OS,3050(27.1%) underwent upper endoscopy at least once every two years during the study *** detection rate of gastric cancer was found to be significantly higher during irregular follow-up than during regular follow-up in both screening programs(0.3%vs 0.2%,P=0.036).A higher incidence of EGC than advanced gastric cancer was observed during regular follow-up compared with irregular follow-up. CONCLUSION:Compliance to the screening program is more important than the type of screening system used.

关键词： Gastric cancer National Cancer Screening Program Opportunistic screening Early gastric cancer

User Recognition System Based on Spectrogram Image Conversion Using EMG Signals

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2022年第7期72卷 1213-1227页

作者： jae Myung Kim gyu Ho Choi Min-Gu Kim Sung Bum Pan Interdisciplinary Program in IT-Bio Convergence System Chosun UniversityGwangju61452Korea IT Research Institute Chosun UniversityGwangju61452Korea

Recently,user recognitionmethods to authenticate personal identity has attracted significant attention especially with increased availability of various internet of things(IoT)services through fifth-generation technology(5G)based mobile *** EMG signals generated inside the body with unique individual characteristics are being studied as a part of nextgeneration user recognition ***,there is a limitation when applying EMG signals to user recognition systems as the same operation needs to be repeated while maintaining a constant strength of muscle over ***,it is necessary to conduct research on multidimensional feature transformation that includes changes in frequency features over *** this paper,we propose a user recognition system that applies EMG signals to the short-time fourier transform(STFT),and converts the signals into EMG spectrogram images while adjusting the time-frequency resolution to extract multidimensional *** proposed system is composed of a data pre-processing and normalization process,spectrogram image conversion process,and final classification *** experimental results revealed that the proposed EMG spectrogram image-based user recognition system has a 95.4%accuracy performance,which is 13%higher than the EMGsignal-based *** a user recognition accuracy improvement was achieved by using multidimensional features,in the time-frequency domain.

关键词： EMG user recognition spectrogram CNN