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Distributed Coordinator Election Scheme for QoS Support and Seamless Connectivity in WPANs

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journal of Computer Science & Technology 2009年第6期24卷 1138-1148页

作者： Soon-gyu Jeong sang-jo Yoo Graduate School of Information Technology & Telecommunications Inha University

Wireless personal area networks （WPANs） are formed in a relatively small area, and coordinator that serves as a central control device plays an important role in the operation and organization of a piconet. Typical applications of WPANs include home automation systems, security systems and health monitoring systems. In these types of systems, guaranteeing seamless connectivity is very important, and communications cannot take place when the coordinator malfunctions. Thus, in the case of a breakdown, it is necessary to elect a new coordinator as soon as possible. For this reason, a distributed coordinator election scheme （DCES） is proposed that considers not only QoS support but also network connectivity in an effort to avoid possible network partition. Simulation results show that the proposed scheme can elect a new coordinator while maintaining QoS and guaranteeing connectivity for a limited period.

关键词： QoS seamless connectivity leader election piconet coordinator (PNC) wireless personal area network (WPAN)

“Designing synthetic topological matter with atoms and lights”

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Light(Science & Applications) 2022年第3期11卷 8-9页

作者： Entong Zhao Chengdong He gyu-Boong jo Department of Physics The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina IAS Center for Quantum Technologies Clear Water BayKowloonHong KongChina

One of the most interesting directions in quantum simulations with ultracold atoms is the expansion of our capability to investigate exotic topological *** sophisticated atom-light couplings in an atomic system,scient... 详细信息

关键词： topological trivial directions

4-Hydroxycinnamic acid attenuates neuronal cell death by inducing expression of plasma membrane redox enzymes and improving mitochondrial functions

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Food Science and Human Wellness 2023年第4期12卷 1287-1299页

作者： Sujin Park YoonA Kim Jaewang Lee Hyunsoo Seo sang-Jip Nam Dong-gyu jo Dong-Hoon Hyun Department of Life Science Ewha Womans UniversitySeoul 03760South Korea Department of Chemistry and Nano Science Ewha Womans UniversitySeoul 03760South Korea School of Pharmacy Sungkyunkwan UniversitySuwon 16419South Korea

Many approaches to neurodegenerative diseases that focus on amyloid-βclearance and gene therapy have not been *** therapeutic applications focus on enhancing neuronal cell survival during the pathogenesis of neurodegenerative diseases,including mitochondrial *** membrane(PM)redox enzymes are crucial in maintaining cellular physiology and redox homeostasis in response to mitochondrial *** phytochemicals are known to induce the expression of detoxifying enzymes under stress *** this study,mechanisms of neuroprotective effects of 4-hydroxycinnamic acid(HCA)were examined by analyzing cell survival,levels of abnormal proteins,and mitochondrial functions in two different neuronal *** protected two neuronal cells exhibited high expression of PM redox enzymes and the consequent increase in the NAD^(+)/NADH *** cultured with HCA showed delayed apoptosis and decreased oxidative/nitrative damage accompanied by decreased ROS production in the *** increased the mitochondrial complexes I and II activities and ATP ***,HCA increased mitochondrial fusion and decreased mitochondrial ***,HCA maintains redox homeostasis and energy metabolism under oxidative/metabolic stress *** findings suggest that HCA could be a promising therapeutic approach for neurodegenerative diseases.

关键词： NADH-quinone oxidoreductase 1(NQO1) Cytochrome b5 reductase 4-Hydroxycinnamic acid Neuroprotection Improved mitochondrial functions

Coral-Like Yolk–Shell-Structured Nickel Oxide/Carbon Composite Microspheres for High-Performance Li-Ion Storage Anodes

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Nano-Micro Letters 2019年第1期11卷 46-63页

作者： Min Su jo Subrata Ghosh sang Mun Jeong Yun Chan Kang Jung sang Cho Department of Engineering Chemistry Chungbuk National University Department of Chemical Engineering Chungbuk National University Department of Materials Science and Engineering Korea University

In this study, coral?like yolk–shell?structured NiO/C composite microspheres(denoted as CYS?NiO/C) were prepared using spray pyrolysis. The unique yolk–shell structure was characterized, and the formation mechanism of the structure was proposed. Both the phase separation of the polyvinylpyrrolidone and polystyrene(PS) colloidal solution and the decompo?sition of the size?controlled PS nanobeads in the droplet played crucial roles in the formation of the unique coral?like yolk–shell structure. The CYS?NiO/C microspheres delivered a reversible discharge capacity of 991 mAh g^(-1) after 500 cycles at the current density of 1.0 A g^(-1). The dis?charge capacity of the CYS?NiO/C microspheres after the 1000 th cycle at the current density of 2.0 A g^(-1) was 635 mAh g^(-1), and the capacity retention measured from the second cycle was 91%. The final discharge capacities of the CYS?NiO/C microspheres at the current densities of 0.5, 1.5, 3.0, 5.0, 7.0, and 10.0 A g^(-1) were 753, 648, 560, 490, 440, and 389 mAh g^(-1), respectively. The synergetic e ect of the coral?like yolk–shell structure with well?defined interconnected mesopores and highly conductive carbon resulted in the excellent Li+?ion storage properties of the CYS?NiO/C microspheres.

关键词： Yolk-shell Nickel oxide Carbon composite Anode materials Spray pyrolysis Lithium-ion batteries

A Novel Goodness of Fit Test Spectrum Sensing Using Extreme Eigenvalues

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Chinese journal of Electronics 2020年第6期29卷 1201-1206页

作者： LI He ZHAO Wenjing LIU Chang JIN Minglu YOO sang-jo School of Information and Communication Engineering Dalian University of Technology Department of Information and Communication Engineering Inha University

The existing Goodness of fit(GoF) test based spectrum sensing algorithms mostly use samples or energies as observations to make decisions,which can hardly achieve satisfactory performance especially when the Primary user(PU) signals are highly ***,the eigenvalue of covariance matrix can reflect signal correlations *** by this,we study the distribution of eigenvalue and propose an eigenvalue based GoF spectrum sensing *** the proposed scheme,we use the ratios of maximum to minimum eigenvalue as observations and thus it can bring performance improvements through capturing correlation of PU *** also provide the related theoretical analysis for the proposed *** results show that the proposed method overcomes the problem of noise uncertainty and achieves performance improvement over the classical samples-based GoF test.

关键词： correlation methods covariance matrices eigenvalues and eigenfunctions radio spectrum management signal denoising signal detection signal sampling eigenvalue based GoF spectrum sensing algorithm goodness of fit test spectrum sensing algorithm GoF test based spectrum sensing algorithm primary user signal covariance matrix eigenvalue signal correlation Cognitive radio spectrum sensing goodness of fit test eigenvalue

Heterogeneity of mature oligodendrocytes in the central nervous system

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Neural Regeneration Research 2025年第5期20卷 1336-1349页

作者： Chao Weng Adam M.R.Groh Moein Yaqubi Qiao-Ling Cui jo Anne Stratton G.R.Wayne Moore Jack P.Antel Neuroimmunology Unit Montreal Neurological Institute-HospitalDepartment of Neurology and NeurosurgeryMcGill UniversityMontrealQCCanada Department of Neurology Renmin Hospital of Wuhan UniversityWuhanHubei ProvinceChina

Mature oligodendrocytes form myelin sheaths that are crucial for the insulation of axons and efficient signal transmission in the central nervous *** evidence has challenged the classical view of the functionally static mature oligodendrocyte and revealed a gamut of dynamic functions such as the ability to modulate neuronal circuitry and provide metabolic support to *** the recognition of potential heterogeneity in mature oligodendrocyte function,a comprehensive summary of mature oligodendrocyte diversity is *** delve into early 20th-century studies by Robertson and Río-Hortega that laid the foundation for the modern identification of regional and morphological heterogeneity in mature ***,recent morphologic and functional studies call into question the long-assumed homogeneity of mature oligodendrocyte function through the identification of distinct subtypes with varying myelination ***,modern molecular investigations,employing techniques such as single cell/nucleus RNA sequencing,consistently unveil at least six mature oligodendrocyte subpopulations in the human central nervous system that are highly transcriptomically diverse and vary with central nervous system *** and disease related mature oligodendrocyte variation denotes the impact of pathological conditions such as multiple sclerosis,Alzheimer's disease,and psychiatric ***,caution is warranted when subclassifying mature oligodendrocytes because of the simplification needed to make conclusions about cell identity from temporally confined *** studies leveraging advanced techniques like spatial transcriptomics and single-cell proteomics promise a more nuanced understanding of mature oligodendrocyte *** research avenues that precisely evaluate mature oligodendrocyte heterogeneity with care to understand the mitigating influence of species,sex,central nervous system region,age,and disease,

关键词： aging central nervous system diseases electron microscopy heterogeneity immunohistochemistry myelin sheath natural history neuroglia oligodendroglia single-cell gene expression analysis

Promoting dynamic recrystallization and improving strength and ductility of Mg-7Bi alloy through Al addition

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journal of Magnesium and Alloys 2024年第8期12卷 3339-3356页

作者： Gun Woong An sang-Cheol Jin Hyun Ji Kim Sumi jo Sung Hyuk Park Department of Materials Science and Metallurgical Engineering Kyungpook National UniversityDaegu 41566Republic of Korea Graduate School of Materials Science and Engineering Kyungpook National UniversityDaegu 41566Republic of Korea

This study investigated the influence of the addition of Al to a Mg-7Bi(B7,wt%)alloy,particularly its recrystallization behavior during extrusion and its resulting mechanical *** addition of 2 wt%Al to the B7 alloy resulted in a lower grain size,a reduction in the number density of fine Mg3Bi2 particles,and a higher area fraction of relatively coarse Mg3Bi2 particles in the extrusion *** microstructural changes increased the nucleation sites for recrystallization,reduced the Zener pinning effect,and enhanced particle-stimulated nucleation,all of which promoted dynamic recrystallization behavior during *** a result,the area fraction of recrystallized grains in the extruded alloy increased from 77%to 94%.The extruded B7 alloy exhibited a strongfiber texture,whereas the extruded Mg-7Bi-2Al(BA72)alloy had a weak-texture,which was attributed to the minimal presence of unrecrystallized grains and the dispersed orientation of the recrystallized *** tensile yield strength(TYS)of the extruded BA72 alloy was higher than that of the extruded B7 alloy(170 and 124 MPa,respectively),which resulted from the enhanced grain-boundary and solid-solution strengthening *** tensile elongation(EL)of the BA72 alloy also exceeded that of the B7 alloy(20.3%and 6.1%,respectively),the result of the uniform formation of fine twins under tension in the former and the formation of a few coarse twins among the unrecrystallized grains in the ***,the addition of a small amount of Al to the B7 alloy significantly improved both the strength and ductility of the extruded alloy,resulting in a remarkable increase in the product of the TYS and EL from 756 to 3451 MPa%and expanding its potential range of applications as a lightweight extruded structural component.

关键词： Mg-7Bi alloy Al addition Extrusion Recrystallization Microstructure

Effect of pre-deformation on precipitation behavior of AZ80 alloy:Comparison of slip-and twinning-dominant deformation

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journal of Magnesium and Alloys 2024年第9期12卷 3616-3630页

作者： Hyun Ji Kim sang Cheol Jin Sumi jo Sung Hyuk Park Department of Materials Science and Metallurgical Engineering Kyungpook National UniversityDaegu 41566Republic of Korea Graduate School of Materials Science and Engineering Kyungpook National UniversityDaegu 41566Republic of Korea

This study investigates the effect of the deformation mode on the precipitation behavior of an extruded Mg-8.0Al-0.5Zn-0.2Mn(AZ80)*** alloy samples are compared after the application of 3.5%tension and 3.5%compression along the extrusion direction to induce slip-dominant and twinning-dominant deformation modes,*** pre-compressed(PC)sample,which contained numerous{10-12}tension twins,has a reduced grain size and a higher internal strain than the pre-tensioned(PT)sample,which is attributed to the inherent internal strain that occurs during the formation and growth of the *** a result,the precipitation behavior of the PC sample is accelerated,leading to its short peak aging time of 32 h,which is lower than those of the PT and as-extruded samples(48 and 100 h,respectively).Furthermore,fine continuous precipitates(CPs)rapidly form within the{10-12}twins,contributing to the enhanced *** precipitates(DPs),which have a hardness comparable to the CP-containing twinned regions,in the PC sample experience less coarsening during aging than those in the PT sample due to growth inhibition by the{10-12}***,the{10-12}twins generated under the twinning-dominant deformation condition lead to enhanced precipitation behaviors,including the preferential formation and refinement of CPs and the suppressed coarsening of ***,pre-deformation that occurs{10-12}twinning exhibits more pronounced effects on precipitation acceleration and microstructural modification than slip-inducing pre-deformation.

关键词： AZ80 alloy Slip Twinning Precipitation Hardness

Overview of single-port laparoscopic surgery for colorectal cancers: Past, present, and the future

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World journal of Gastroenterology 2014年第4期20卷 997-100页

作者： Say-June Kim Byung-jo Choi sang Chul Lee Department of Surgery Daejeon St. Mary’s Hospital the Catholic University of Korea

Single-port laparoscopic surgery (SPLS) is implemented through a tailored minimal single incision through which a number of laparoscopic instruments access. Introduction of operation-customized port system, utilization of a camera without a separate external light, and instruments with different lengths has brought the favorable environment for SPLS. However, performing SPLS still creates several hardships compared to multiport laparoscopic surgery; a single-port system inevitably leads to clashing of surgical instruments due to crowding. To overcome such difficulties, investigators has developed novel concepts and maneuvers, including the concept of inverse triangulation and the maneuvers of pivoting, spreading out dissection, hanging suture, and transluminal traction. The final destination of SPLS is expected to be a completely seamless operation, maximizing the minimal invasiveness. Specimen extraction through the umbilicus can undermine cosmesis by inducing a larger incision. Therefore, hybrid laparoscopic technique, which combined laparoscopic surgical technique with natural orifice specimen extraction (NOSE) - i.e., transvaginal or transanal route-, has been developed. SPLS and NOSE seemed to be the best combination in pursuit of minimal invasiveness. In the near future, robotic SPLS with natural orifice transluminal endoscopic surgery’s way of specimen extraction seems to be pursued. It is expected to provide a completely or nearly complete seamless operation regardless of location of the lesion in the abdomen.

关键词： Colorectal neoplasms Colectomy Laparoscopy Natural orifice endoscopic surgery Single-port laparoscopic surgery