检索结果-南通市图书馆

Anaplastic Hemangiopericytoma Presenting as an intraparenchymal mass—Case report

在线全文

学校读者我要写书评

暂无评论

Anaplastic Hemangiopericytoma Presenting as an intraparenchy...

An intrasellar rhabdomyosarcoma-case report

中国抗癌协会神经肿瘤专业委员会第八届学术会议

作者： Ki-Sun Hong Shin-hyuk Kang dong-hyuk park Yong-Gu Chung Department of neurosurgery Korea University Anam Hospital

＜正＞Introduction Primary hemangiopericytoma of the central nervous system（CNS） is presumed to originate from capillary pericytes（Zimmermann’s pericytes） surrounding the endothelial lining of the blood vessels. ...

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

An intrasellar rhabdomyosarcoma-case report

Hydroxyurea chemotherapy for treatment of unresectable or residual meningioma （Preliminary report）

中国抗癌协会神经肿瘤专业委员会第八届学术会议

作者： Ki-Sun Hong Shin-hyuk Kang dong-hyuk park Yong-Gu Chung Department of neurosurgery Korea University Anam Hospital

＜正＞Introduction Rhabdomyosarcoma is a malignant tumor of the skeletal muscle cells. Those tumors mainly affect children and arise in primitive fetal mesenchyme even at sites that do not contain skeletal

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Hydroxyurea chemotherapy for treatment of unresectable or re...

Influence of the electrolyte conductivity on the critical current density and the breakdown voltage

第四届中国肿瘤学术大会暨第五届海峡两岸肿瘤学术会议

作者： Chung Yong-Gu Oh-Lyong Kim Shin Jung dong-hyuk park IL-Young Shin Department of Neurosurgery College of MedicineKorea UniversitySeoulKorea Department of Neurosurgery College of MedicineYeungnam UniversityDaeguKorea Department of Neurosurgery College of MedicineChonnam UniversityGwangjuKorea Department of Neurosurgery College of MedicineKorea UniversitySeoulKorea Department of Neurosurgery College of MedicineKorea UniversitySeoulKorea

＜正＞Introduction: Unresectable or residual meningioma are infrequent but need a special consideration. Many adjuvantive therapies have been tested to overcome this problem, however clear evidence is not defined. It has been suggested that hydroxyurea can cause regression of unresectable or recurrent meningioma. In this study, we examined the response of hydroxyurea in the treatment of unresectable or residual meningioma. Methods: Hydroxyurea was administered at a dosage of approximately 20

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Difference in extrusion temperature dependences of microstructure and mechanical properties between extruded AZ61 and AZ91 alloys

Chinese Journal of Chemical Engineering 2023年第7期

作者： Hae-Kyun park dong-hyuk park Bum-Jin Chung

来源：博看期刊评论

在线全文

博看期刊

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2023年第5期11卷 1683-1696页

作者： dong Hee Lee Gyo Myeong Lee Sung hyuk park School of Materials Science and Engineering Kyungpook National UniversityDaegu 41566Republic of Korea

The effects of extrusion temperature on the microstructure and tensile properties of extruded AZ61 and AZ91 alloys are investigated by subjecting them to hot extrusion at 300 and 400℃.Although the average grain size of the extruded AZ61 alloy slightly increases from 9.5 to 12.6μm with increasing extrusion temperature,its resultant microstructural variation is *** contrast,the average grain size of the extruded AZ91 alloy significantly increases from 5.7 to 22.5μm with increasing extrusion temperature,and the type of Mg17Al12 precipitates formed in it changes from fine dynamic precipitates with a spherical shape to coarse static precipitates with a lamellar *** the extrusion temperature increases,the tensile yield strength of the extruded AZ61 alloy increases from 183 to 197 MPa while that of the extruded AZ91 alloy decreases from 232 to 224 *** tensile elongations of the extruded AZ61 and AZ91 alloys decrease with increasing extrusion temperature,but the degree of decrease is significant in the latter *** different extrusion temperature dependences of the tensile properties of the extruded AZ61 and AZ91 alloys are discussed in terms of their microstructural characteristics,strengthening mechanisms,and crack initiation sites.

关键词： Mg-Al-Zn alloys Extrusion temperature Precipitation Strengthening mechanism Tensile properties

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2011年第5期18卷 1602-1608页

作者： LEE Sang-hyuk park Wook-Je JUNG dong-yean Department of Electrical and Electronic Engineering Xi'an Jiaotong-Liverpool University Institute for Information and Electronics Research Inha University253 Yonghyun-dongNam-GuIncheon402-751Korea Daeho Technology Korea Co. LtdChangwonGyeongnam641-773Korea

The similarity computations for fuzzy membership function pairs were carried *** number related knowledge was introduced,and conventional similarity was compared with distance based similarity *** usefulness of the proposed similarity measure was *** results show that the proposed similarity measure could be applied to ordinary fuzzy membership functions,though it was not easy to *** conventional results on the calculation of similarity for fuzzy membership pair,fuzzy membership-crisp pair and crisp-crisp pair were carried *** proposed distance based similarity measure represented rational performance with the heuristic point of ***,troublesome in fuzzy number based similarity measure for abnormal universe of discourse case was ***,the similarity measure computation for various membership function pairs was discussed with other conventional results.

关键词： similarity measure fuzzy number distance similarity evaluation fuzzy membership function

M-IDM: A Multi-Classication Based Intrusion Detection Model in Healthcare IoT

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2021年第5期67卷 1537-1553页

作者： Jae dong Lee Hyo Soung Cha Shailendra Rathore Jong hyuk park Healthcare AI Team National Cancer CenterGoyang-si10408Korea Department of Computer Science and Engineering Seoul National University of Science and Technology(SeoulTech)Seoul01811Korea

In recent years,the application of a smart city in the healthcare sector via loT systems has continued to grow exponentially and various advanced network intrusions have emerged since these loT devices are being *** studies focused on security threat detection and blocking technologies that rely on testbed data obtained from a single medical IoT device or simulation using a well-known dataset,such as the NSL-KDD ***,such approaches do not reect the features that exist in real medical scenarios,leading to failure in potential threat *** address this problem,we proposed a novel intrusion classication architecture known as a Multi-class Classication based Intrusion Detection Model(M-IDM),which typically relies on data collected by real devices and the use of convolutional neural networks(i.e.,it exhibits better performance compared with conventional machine learning algorithms,such as naïve Bayes,support vector machine(SVM)).Unlike existing studies,the proposed architecture employs the actual healthcare IoT environment of National Cancer Center in South Korea and actual network data from real medical devices,such as a patient’s monitors(i.e.,electrocardiogram and thermometers).The proposed architecture classies the data into multiple classes:Critical,informal,major,and minor,for intrusion ***,we experimentally evaluated and compared its performance with those of other conventional machine learning algorithms,including naïve Bayes,SVM,and logistic regression,using neural networks.

关键词： Smart city healthcare IoT neural network intrusion classication machine learning

Characterization of plasma electrolytic oxide formed on AZ91 Mg alloy in KMnO_4 electrolyte

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2009年第4期19卷 829-834页

作者： Duck-Young HWANG Ki-Ryong SHIN Bongyoung YOO dong-Heon LEE Deok-Yong park dong-hyuk SHIN Department of Metallurgy and Materials Science Hanyang University Ansan 426-791 Korea Department of Applied Materials Engineering Hanbat National University Daejon 305-719 Korea 不详

The aim of this work is to investigate microstructure,corrosion resistance characteristics and nanohardness of the oxide layer on AZ91 Mg alloy by applying different voltage with KMnO4 contained *** are lots of closed pores that are filled with another oxide compound compared with the typical surface morphology with pore coated until 350 V of coating *** thickness of oxide layer increases with increasing coating *** oxide layer formed on AZ91 Mg alloy in electrolyte with potassium permanganate consists of MgO and *** potential of the oxide layer on AZ91 Mg alloy obtained at different plasma electrolytic oxidation(PEO) reaction stages increases with increasing coating *** corrosion resistance of AZ91 Mg alloy depends on the existence of the manganese oxide in the oxide *** inner barrier layer composed of the MgO and Mn2O3 may serve as diffusion barrier to enhance the corrosion resistance and may partially explain the excellent anti-corrosion performance in corrosion *** values increase with increasing coating *** increase in the nanohardness may be due to the effect of manganese oxide in the oxide layer on AZ91 Mg alloy coated from electrolyte containing KMnO4.

关键词： AZ91镁合金等离子体电解高锰酸钾氧化特性电解液氧化层厚度纳米硬度耐腐蚀性

Extrusion limit diagram of AZ91–0.9Ca–0.6Y–0.5MM alloy and effects of extrusion parameters on its microstructure and mechanical properties

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2022年第12期10卷 3447-3458页

作者： dong HeeLee Ye Jin Kim Sang-Hoon Kim Byoung Gi Moon Sung hyuk park School of Materials Science and Engineering Kyungpook National UniversityDaegu 41566Republic of Korea Agency for Defense Development Daejeon 34186Republic of Korea Advanced Metals Division Korea Institute of Materials ScienceChangwon 51508Republic of Korea

An AZ91–0.9Ca–0.6Y–0.5MM(AZXWMM91100) alloy, which has higher corrosion resistance, ignition resistance, and extrudability than a commercial AZ91 alloy, has been developed recently. In this study, the AZXWMM91100 alloy is extruded at various temperatures(300–400 ℃) and ram speeds(1–14.5 mm/s), and the cracking behaviors, microstructure, and tensile properties of the extruded materials are systematically analyzed. On the basis of the pressure limit and surface and internal cracking limit, the extrusion limit diagram providing a safe extrusion processing zone is established. All of the materials extruded at temperatures and speeds within the safe extrusion processing zone have high surface quality and moderate tensile ductility with an elongation higher than 10%. Moreover, they have a fully recrystallized grain structure and contain undissolved particle stringers arranged parallel to the extrusion direction. The grain size of the extruded material does not show any relationship with the Zener–Hollomon parameter(Z). However, the yield strength(YS) of the extruded material is inversely proportional to the logarithm of the Z value, and their relationship is expressed as YS =-31.2·log(Z) + 536. These findings may broaden the understanding of the AZXWMM91100 alloy with excellent chemical and physical properties and provide valuable information for the development of high-performance extruded Mg products using this alloy.

关键词： Magnesium Extrudability Extrusion limit diagram Microstructure Tensile properties