检索结果-南通市图书馆

Humidity-induced synaptic plasticity of ZnO artificial synapses using peptide insulator for neuromorphic computing

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 Materials Science & Technology 2022年第24期119卷 150-155页

作者： Min-Kyu song Hojung Lee jeong Hyun yoon Young-Woong song Seok Daniel Namgung Taehoon Sung yoon-Sik Lee Jong-Seok Lee Ki Tae Nam Jang-Yeon Kwon School of Integrated Technology Yonsei UniversityIncheon 21983South Korea Department of Materials Science and Engineering Seoul National UniversitySeoul 08826South Korea Soft Foundry Seoul National UniversitySeoul 08826South Korea School of Chemical and Biological Engineering Seoul National UniversitySeoul 08826South Korea

Neuromorphic devices inspired by the human brain have attracted significant attention because of their excellent ability for cognitive and parallel *** study presents ZnO-based artificial synapses with peptide insulators for the electrical emulation of biological *** demonstrated the dynamic responses of the device under various environmental *** proton-conducting property of the tyrosine-rich peptide enables time-dependent responses under ambient conditions such that various aspects of synaptic behaviors are emulated by the *** transition from short-term memory to longterm memory is achieved via electrochemical doping of ZnO by ***,we demonstrate an image classification simulation using a multi-layer perceptron model to evaluate the potential of the device for use in neuromorphic *** neural network based on our device achieved a recognition accuracy of 87.47% for the MNIST handwritten digit *** work proposes a novel device platform inspired by biosystems for brain-mimetic hardware systems.

关键词： Artificial synapse Neuromorphic computing Oxide semiconductor Proton conductor Artificial neural network

Tyrosine-mediated analog resistive switching for artificial neural networks

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第1期16卷 858-864页

作者： Min-Kyu song Seok Daniel Namgung Hojung Lee jeong Hyun yoon Young-Woong song Kang Hee Cho yoon-Sik Lee Jong-Seok Lee Ki Tae Nam Jang-Yeon Kwon School of Integrated Technology Yonsei UniversityIncheon 21983Republic of Korea Department of Mechanical Engineering Massachusetts Institute of TechnologyMA 02139USA Research Laboratory of Electronics Massachusetts Institute of TechnologyMA 02139USA Department of Materials Science and Engineering Seoul National UniversitySeoul 08826Republic of Korea Soft Foundry Seoul National UniversitySeoul 08826Republic of Korea School of Chemical and Biological Engineering Seoul National UniversitySeoul 08826Republic of Korea

The fourth industrial revolution indispensably brings explosive data processing and storage;thus,a new computing paradigm based on artificial intelligence-enabling device structure is urgently *** have received considerable attention in this regard because of their ability to process and store data at the same ***,fundamental problems with abrupt switching characteristics limit their practical *** address this problem,we utilized the concept of metaplasticity inspired by biosystems and observed gradual switching in the peptide-based memristor at high proton *** unexpectedly high slope value>1.7 in the logI–V curve at low voltage(≤400 mV)was considered the main origin,and it might arise from the modulatory response of proton ions on the threshold of Ag ion migration in the peptide *** the obtained gradual switching property at high proton conductivity,the device showed significantly increased accuracy of image recognition(~82.5%).We believe that such a demonstration not only contributes to the practical application of neuromorphic devices but also expands the bioinspired functional synthetic platform.

关键词： artificial synapse neuromorphic computing proton conductor peptide materials artificial neural network

Severe mediastinitis and pericarditis after endobronchial ultrasoundguided transbronchial needle aspiration:A case report

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2021年第34期9卷 10723-10727页

作者： jeong Suk Koh yoon Joo Kim Da Hyun Kang jeong Eun Lee song-I Lee Department of Pulmonary and Critical Care Medicine Chungnam National University HospitalDaejeon 35015South Korea

BACKGROUND Endobronchial ultrasound-guided transbronchial needle aspiration(EBUS-TBNA)is a safe and minimally invasive diagnostic tool for mediastinal and hilum ***,infectious complications may occur after *** these,mediastinitis and pericarditis are *** SUMMARY A 67-year-old woman was referred to our hospital due to paratracheal lymph node enlargement on chest computed tomography(CT).EBUS-TBNA was performed on the lymph node lesions,and prophylactic oral antibiotics were *** days after EBUS-TBNA,the patient visited the emergency room with a high fever and chest *** test results revealed leukocytosis with a left shift and elevated C-reactive protein level(25.7 mg/dL).Chest CT revealed the formation of a mediastinal abscess in the right paratracheal lymph node and pericardial and bilateral pleural *** patient received intravenous antibiotic treatment,cardiac drainage through pericardiocentesis,and surgical *** patient recovered favorably and was discharged 31 d after the *** Mediastinitis and pericarditis after EBUS-TBNA are rare but should be considered even after the use of prophylactic antibiotics.

关键词： Endoscopic ultrasound-guided fine needle aspiration Complication Mediastinitis Pericarditis Antibiotics Case report

An Efficient and Spam-Robust Proximity Measure Between Communication Entities

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 Computer Science & Technology 2013年第2期28卷 394-400页

作者： Joo Hyuk Jeon Jihwan song jeong Eun Kwon yoon Joon Lee Man Ho Park Myoung Ho Kim Department of Computer Science Korea Advanced Institute of Science and Technology Biz Solution Team SK Telecom Information Technology R&D Center Mobile Communication Convergence Research Team Electronics and Telecommunications Research Institute

Electronic communication service providers are obliged to retain communication data for a certain amount of time by their local laws. The retained communication data or the communication logs are used in various applications such as crime detection, viral marketing, analytical study, and so on. Many of these applications rely on effective techniques for analyzing communication logs. In this paper, we focus on measuring the proximity between two communication entities, which is a fundamental and important step toward further analysis of communication logs, and propose a new proximity measure called ESP （Efficient and Spam-Robust Proximity measure）. Our proposed measure considers only the （graph- theoretically） shortest paths between two entities and gives small values to those between spam-like entities and others. Thus, it is not only computationally efficient but also spam-robust. By conducting several experiments on real and synthetic datasets, we show that our proposed proximity measure is more accurate, computationally efficient and spam-robust than the existing measures in most cases.

关键词： proximity closeness spam electronic communication

The learning curve for transurethral enucleation with bipolar energy for benign prostate hyperplasia:a single-surgeon experience of 494 patients

在线全文

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2024年第3期26卷 288-294页

作者： Byeongdo song Sang Hun song Seong Jin jeong Department of Urology Seoul National University Bundang HospitalSeongnam 13620Korea Department of Urology Seoul National University College of MedicineSeoul 03080Korea

This study was performed to investigate the learning curve of transurethral enucleation with bipolar energy(TUEB)for benignprostatic *** study involved 494 consecutive patients who underwent TUEB for benign prostatic hyperplasia fromAugust 2018 to March 2022 by one surgeon(SJJ,Seoul National University Bundang Hospital,Seongnam,Korea).The patientswere followed up at 1 week,1 month,3 months,and 6 months *** evaluate the learning curve of TUEB,perioperativeparameters including the enucleation ratio(enucleated tissue weight/transitional zone volume),TUEB efficiency(enucleatedtissue weight/operation time),and enucleation efficiency(enucleated tissue weight/enucleation time)were *** and postoperative complications were also assessed,including the International Prostate Symptom Score(IPSS),IPSSquality-of-life(QoL)score,and uroflowmetry *** patients’median age was 72(interquartile range[IQR]:66–78)years,and the estimated prostate volume and transitional zone volume were 63.0(IQR:46.0–90.6)ml and 37.1(IQR:24.0–60.0)ml,*** enucleation ratio,TUEB efficiency,and enucleation efficiency were 0.60(IQR:0.46–0.54)g ml−1,0.33(IQR:0.22–0.46)g min−1,and 0.50(IQR:0.35–0.72)g min−1,respectively,plateauing after 70 *** functional outcomes,including total IPSS,IPSS QoL score,and uroflowmetry outcomes,significantly improved at 6 months after TUEB(all P<0.05),but without significant differences over the learning ***-five(13.2%)patients developed complications after TUEB,21.5%of whom experienced major complications(Clavien–Dindo grade≥3).The rate of major complications declined as the number ofTUEB cases increased(P=0.013).Our results suggest that the efficiency of TUEB stabilized within 70 procedures.

关键词： benign prostate hyperplasia learning curve perioperative efficiency prostate transurethral enucleation with bipolar energy

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

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 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

Energy efficient mechanism using flexible medium access control protocol for hybrid wireless sensor networks

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 2013年第8期20卷 2165-2174页

作者： SUN Ning jeong yoon-su LEE Sang-ho Department of Computer Science Chungbuk National University Department of Information Communication Engineering Mokwon University

Energy efficiency is a primary consideration in a wireless sensor network (WSN). This is also a major parameter when designing a medium access control (MAC) protocol for WSNs. Hierarchical clustering structure is regarded suitable for WSNs due to its good performance in energy conservation. In this work, an adequately flexible mechanism for clustering WSNs is designed, in which some creative or promotional metrics are utilized, such as cluster head selection algorithm, cluster optional reconstruction, interested data transmission, multiple path routing protocol. All these strategies were cooperated to maximize energy saving of whole system. An appropriate MAC protocol for this mechanism is proposed, by flexibly switching the status of diverse sensor nodes in different strategies. The simulation results show that the proposed MAC protocol is suitable for clustering WSNs and performs well in aspects of energy efficiency, flexibility and scalability.

关键词： MAC protocol energy conservation flexibility re-clustering wireless sensor network

Challenges and opportunities for using formate to store, transport, and use hydrogen

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2020年第2期29卷 216-224页

作者： Katarzyna Grubel Hyangsoo jeong Chang Won yoon Tom Autrey Pacific Northwest National Laboratory 902 Battelle Boulevard.P.O.Box 999.Richland.WA 99352.United States Center for Hydrogen and Fuel Cell Research Korea Institute of Science and Technology(KIST).5 Hwarang-ro 14-gil.Seongbuk-gu.Seoul 02792Republic of Korea Divison of Energy and Environment Technology KIST SchoolKorea University of Science and Technology5 Hwarung-ro 14-gil.Seongbuk-guSeoul 02792.Republic of Korea KHU-KIST Department of Converging Science and Technology Kyung Hee University26 Kyungheedae-ro.Dongdaemun-guSeoul 02447Republic of Korea

In this perspective article,the synthesis and thermodynamic properties of aqueous solutions of formate salts(FS,HCO2-)are described in relationship to the concept of *** physiochemical properties of solid FS,aqueous formate solutions,and aqueous bicarbonate solutions set the limitations for storage capacity,deliverable capacity,and usable H2capacity of these H2carriers,*** parameters will help in the design of systems that use H2carriers for storage and transport of H2for fuel cell power ***,as well as admixtures with formic acid(FA,H2CO2),have potential to address the goals outlined in the *** of Energy’s H2@scale initiative to store in chemical bonds a significant quantity of energy(hundreds of megawatts)obtained from large scale renewable resources.

关键词： Hydrogen carriers Formate salts Bicarbonate salts Thermodynamics

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

在线全文

学校读者我要写书评

暂无评论

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