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Comparison of wrist motion classification methods using surface electromyogram

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Journal of Central South University 2013年第4期20卷 960-968页

作者： jeong Eui-chul KIM Seo-jun song Young-rok LEE Sang-min Department of Electronic Engineering Inha University

The Gaussian mixture model (GMM), k-nearest neighbor (k-NN), quadratic discriminant analysis (QDA), and linear discriminant analysis (LDA) were compared to classify wrist motions using surface electromyogram (EMG). Effect of feature selection in EMG signal processing was also verified by comparing classification accuracy of each feature, and the enhancement of classification accuracy by normalization was confirmed. EMG signals were acquired from two electrodes placed on the forearm of twenty eight healthy subjects and used for recognition of wrist motion. Features were extracted from the obtained EMG signals in the time domain and were applied to classification methods. The difference absolute mean value (DAMV), difference absolute standard deviation value (DASDV), mean absolute value (MAV), root mean square (RMS) were used for composing 16 double features which were combined of two channels. In the classification methods, the highest accuracy of classification showed in the GMM. The most effective combination of classification method and double feature was (MAV, DAMV) of GMM and its classification accuracy was 96.85%. The results of normalization were better than those of non-normalization in GMM, k-NN, and LDA.

关键词： Gaussian mixture model k-nearest neighbor quadratic discriminant analysis linear discriminant analysis electromyogram (EMG) pattern classification feature extraction

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Spatial distribution and comparative evaluation of phosphorus release rate in benthic sediments of an estuary dam

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International Journal of Sediment Research 2022年第3期37卷 355-369页

作者： Yongsik song Yong-Hoon jeong Chang-Min Shin Dong-Heui Kwak Geosystem Research Corporation Department of Civil Engineering Jeonbuk National University Department of Bio-Convergence Science Jeonbuk National University Water Quality Assessment Research Division National Institute of Environmental Research Department of Bioactive Materials Science Jeonbuk National University

A series of experiments and simulations were performed to ascertain the rate at which phosphorus is released using a water quality model in Saemangeum Lake, an artificially constructed lake located in an estuary. The general inflow of seawater once a day contributed to the formation of a halocline in the lake water, which caused variation in the vertical concentration of dissolved oxygen. The halocline was mainly observed in the deep downstream regions of Saemangeum Lake that are close to the open sea. In contrast, the shallower regions upstream, which are under the influence of pollutant-loading from upstream rivers, exhibited high concentrations of chemical oxygen demand, total phosphorus, and Chl-a,resulting in lower water quality than the downstream regions. Laboratory experiments investigating the release of phosphorus at five representative locations showed that the upstream release flux, where the halocline was weaker, was higher than that downstream, where the initial level of phosphorus sedimentation was high. In particular, a need for an accurate evaluation method for the release of phosphorus at each site was suggested as slight differences were obtained depending on the estimation method used at each representative location. The results of the phosphorus release experiments led to the use of time-weighted integration(TWI), terminated time evaluation, and statistical mean value; the Environmental Fluid Dynamics Code-National Institute of Environment Research model, a widely used water quality model for studying retention watersheds, was applied to the simulation of hydraulic and water quality characteristics for the Saemangeum Lake and its surrounding waters. The result of the water quality simulation indicated the highest reproducibility for release-time TWI so that TWI values were more useful in predicting phosphorus concentrations and the subsequent management of water quality.

关键词： Eutrophication Phosphorus release Salinity Sediments Water quality simulation Environmental Fluid Dynamics Code–National Institute of Environment Research model (EFDC-NIER)

Hemophagocytic lymphohistiocytosis triggered by relapsing polychondritis:A case report

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World Journal of Orthopedics 2024年第8期15卷 813-819页

作者： Mi-Ran Han jeong-Hwan Hwang Seungah Cha So-Yeon Jeon Kyu Yun Jang Namsu Kim Chang-Hoon Lee Department of Internal Medicine Jeonbuk National University Medical SchoolJeonju 54907South Korea Department of Pathology Jeonbuk National University Medical SchoolJeonju 54907South Korea Department of Laboratory Medicine Jeonbuk National University Medical SchoolJeonju 54907South Korea

BACKGROUND Hemophagocytic lymphohistiocytosis(HLH)is a rare,life-threatening disorder caused by abnormal histiocytes and T cell *** adults,it is predominantly associated with infections,cancers,and autoimmune *** polychondritis(RP),another rare disease,is diagnosed based on symptoms without specific tests,featuring cartilage inflammation characterized by swelling,redness,and pain,rarely inducing *** SUMMARY A 74-year-old woman visited the emergency room with a fever of 38.6℃.Blood tests,cultures,and imaging were performed to evaluate *** showed increased fluorescent antinuclear antibody levels and mild cytopenia,with no other specific *** revealed lymph node enlargement was observed;however,biopsy results were *** re-evaluation of the physical exam,inflammatory signs suggestive of RP were observed in the ears and nose,prompting a tissue biopsy for ***,persistent fever accompanied by cytopenia prompted a bone marrow examination,revealing hemophagocytic *** finding no significant results in blood culture,viral markers,and tissue examination of enlarged lymph nodes,HLH was diagnosed by *** involved methylprednisolone followed by *** two months,bone marrow examination confirmed resolution of hemophagocytosis,with normalization of hyperferritinemia and *** Thorough physical examination enabled diagnosis and treatment of HLH trig gered by RP in patients presenting with fever of unknown origin.

关键词： Hemophagocytic lymphohistiocytosis Relapsing polychondritis Autoimmune disease Fever of unknown origin Steroid Case report

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

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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

Laparoscopic resection of an adrenal pseudocyst mimicking a retroperitoneal mucinous cystic neoplasm

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World Journal of Gastroenterology 2009年第23期15卷 2923-2926页

作者： Bum-Soo Kim Sun-Hyung Joo Sung-Il Choi jeong-Yoon song Division of Hepatobiliary Surgery Department of Surgery Kyung Hee University College of Medicine and East-West Neo Medical Center 149 Sangil-dong Gangdong-gu Seoul 134-727 South Korea

Adrenal pseudocysts are rare cystic masses that arise within the adrenal gland and are usually non-functional and asymptomatic. Adrenal pseudocysts consist of a fibrous wall without a cellular lining. We report a patient with a 9 cm, left-sided suprarenal cystic mass who presented with abdominal discomfort of 2 years＇ duration. A 38-year-old woman was referred to our service for evaluation of abdominal discomfort and gastrointestinal symptoms. Routine laboratory tests were within normal limits. An abdominal computed tomography scan showed a 9 cm × 8 cm × 8 cm well-defined cystic lesion displacing the left kidney. Magnetic resonance imaging showed a cystic lesion with low signal intensity on the Tl-weighted image and high signal intensity on the T2-weighted image. A laparoscopic left adrenalectomy was performed to diagnose the lesion. The final pathology showed an adrenal pseudocyst without a cellular lining. The patient had no postoperative complications and she was discharged four days after surgery.

关键词： Adrenal gland Pseudocyst Laparoscopy Adrenalectomy

Analysis of identifiers in IoT platforms

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Digital Communications and Networks 2020年第3期6卷 333-340页

作者： Haris Aftab Komal Gilani JiEun Lee Lewis Nkenyereye SeungMyeong jeong JaeSeung song Software Engineering and Security(SES)Lab Department of Computer and Information SecuritySejong UniversitySeoul05006Republic of Korea IoT Convergence Platform Lab Korea Electronics Technologies InstituteSungnam-Si13509Republic of Korea

The Internet of Things(IoT)provides new opportunities for different IoT platforms connecting various devices *** need to identify those devices is the foremost important to perform any kind of *** organizations and standard bodies that provide specifications and frameworks for the IoT currently have their own identification *** existing industrial identification mechanisms can also be used in the *** is no common Identification Scheme(IS)for the IoT as yet,because of the political and commercial differences amongst the standard *** unavailability of a unified IS method makes the inter-working among IoT platforms *** paper analyses and compares ISs used by several selected IoT *** work will help in understanding the need for a common identification mechanism to provide inter-working among different IoT platforms.

关键词： Internet of things Identifiers Identification schemes IoT platforms IoT standards

Fabrication of Near Net Shape Metallic Foam via Plaster Mould

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Journal of Materials Science & Technology 2008年第3期24卷 335-339页

作者： Young-Hwan song Hwan-Goo Seon Soo-Han Parka Min-Jae jeong Bo-Young Hur i-Cube Center School of Nano and Advanced Materials EngineeringGyeongsang National University ERIC School of Nano and Advanced Materials EngineeringGyeongsang National University

Fabrication characteristics are unstable in direct foaming method. Therefore, most of near net-shape metallic foams are produced, and investigated by powder metallurgy. Direct foaming method, however, has many benefits （i.e. reduce the unit cost of goods and fabrication process etc.） to fabrication of metallic foams. In this article, the fabrication characteristic of near net-shape metallic foams by direct foaming method was evaluated. Al and Plaster was used for base material and mould material respectively. Ca and TiH2 were added to molten Al as thickening and blowing agent for stable condition of bubbles. Thickening time was about 10 min with a stirring speed of 600 r/min. Foaming time was 30-120 s for evaluation of the optimum foaming condition. Amount of agent was selected by pre-experimental data. Porosity of near net-shape goods was measured by Archimedes method. On the other hand, it seems that increasing poring time and thickening agent make the poor porosity

关键词： Metal foam Near net shape foam Porosity

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Malignant melanotic nerve sheath tumors in the spinal canal of psammomatous and non-psammomatous type: Two case reports

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World Journal of Clinical Cases 2022年第24期10卷 8735-8741页

作者： jeong A Yeom You Seon song In Sook Lee In Ho Han Kyung Un Choi Department of Radiology Pusan National University Yangsan HospitalYangsan 50612South Korea Department of Radiology Pusan National University HospitalBusan 49241South Korea Department of Neurosurgery Pusan National University HospitalBusan 49241South Korea Department of Pathology Pusan National University HospitalBusan 49241South Korea

BACKGROUND A malignant melanotic nerve sheath tumor(MMNST),previously known as a melanotic schwannoma,is a rare variant of a peripheral nerve sheath tumor composed of Schwann cells with melanotic *** a few reports of spinal MMNST have been *** SUMMARY In the first case,a 58-year-old woman presented with a history of low back pain and *** resonance imaging(MRI)and computed tomography(CT)of the lumbar spine revealed an intradural extramedullary mass lesion with amorphous linear *** tumor resection was performed and histological examination revealed a psammomatous melanotic *** the second case,a 72-year-old man presented with low back pain and *** of the thoracolumbar spine revealed an intramedullary mass lesion at the T11 vertebral body *** mass lesion was hypointense on T2WI and hyperintense on *** resection was performed and the histologic result was melanotic *** MMNST should be considered in the differential diagnosis when calcification or melanin is seen in an intradural spinal tumor.

关键词： Nerve sheath neoplasm Extramedullary Malignant Melanotic Magnetic resonance imaging Case reports

An Efficient and Spam-Robust Proximity Measure Between Communication Entities

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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

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