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DISTRIBUTIONS ON ALMOST CONTACT MANIFOLDS

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Acta Mathematica Scientia 2017年第3期37卷 695-702页

作者： Hyunjoo cho National Center for Theoretical Sciences Mathematics Division Taipei 10617 China

It is known that any hypersurface in an almost complex space admits an almost contact manifold [11, 14]. In this article we show that a hyperplane in an almost contact manifold has an almost complex structure. Along with this result, we explain how to deter- mine when an almost contact structure induces a contact structure, followed by examples of a manifold with a closed G2-structure.

关键词： Almost contact structure contact structure G2-structure foliation integra-bility

Efficient Autonomous Defense System Using Machine Learning on Edge Device

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Computers, Materials & Continua 2022年第2期70卷 3565-3588页

作者： Jaehyuk cho School of Electronic Engineering Soongsil UniversitySeoul06978Korea

As a large amount of data needs to be processed and speed needs to be improved,edge computing with ultra-low latency and ultra-connectivity is emerging as a new *** changes can lead to new cyber risks,and should therefore be considered for a security threat *** this end,we constructed an edge system to study security in two directions,hardware and ***,on the hardware side,we want to autonomically defend against hardware attacks such as side channel attacks by configuring field programmable gate array(FPGA)which is suitable for edge computing and identifying communication status to control the communication method according to *** addition,on the software side,data collected on the server performs end-to-end encryption via symmetric encryption ***,we modeled autonomous defense systems on the server by using machine learning which targets to incoming and outgoing *** log utilizes existing intrusion detection datasets that should be used in real-world *** log was used to detect intrusion early by modeling an intrusion prevention system to identify behaviors that violate security policy,and to utilize the existing intrusion detection data set that should be used in a real *** this,we designed an efficient autonomous defense system that can provide a stable system by detecting abnormal signals from the device and converting them to an effective method to control edge computing,and to detect and control abnormal intrusions on the server side.

关键词： Autonomous defense side channel attack intrusion prevention system edge computing machine learning

Self Localization Method Using Parallel Projection Model for Mobile Sensor in Navigation Applications

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Journal of Computer Science & Technology 2009年第3期24卷 588-603页

作者： Shung Han cho Yuntai Kyong Sangjin Hong We-Duke cho Department of Electrical and Computer Engineering Stony Brook University- SUNY Stony Brook NY U.S.A. Department of Electronics Engineering College of Information Technology Ajou University Suwon Korea

This paper presents a novel self localization method using parallel projection model for mobile sensor in navigation applications. The algorithm estimates the coordinate and the orientation of mobile sensor using projected references on visual image. The proposed method considers the lens non-linearity of the camera and compensates the distortion by using a calibration table. The method determines the coordinates and orientations with iterative process, which is very accurate with low computational demand. We identify various sources of error on the coordinate and orientation estimations, and present both static sensitivity analysis of the algorithm and dynamic behavior of the mobile sensor. The algorithm can be utilized in mobile robot navigation as well as positioning application where accurate self localization is necessary.

关键词： mobile sensors localization parallel projection model visual processing

Extraction of Behavioural Requirements for Simulation-based Performance Evaluation of Manufacturing Systems

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Journal of Systems Science and Systems Engineering 2019年第5期28卷 555-579页

作者： Junpil Kim Hyunbo cho Department of Industrial and Management Engineering Pohang University of Science and Technology(POSTECH) Republic of Korea

A simulation model enables manufacturers to accurately evaluate the performance of their manufacturing systems.A vital input to build simulation models of manufacturing systems is the system behaviour,which is modelled based on extensive data on manufacturing systems and their ***,for outsourced manufacturing systems,data provided from external suppliers to manufacturers are generally limited and ***,a solution is required to identify and secure system behaviour from available *** propose herein a behaviour extraction process along with detailed activities and diagrams to extract system behaviour from limited *** using the systems engineering standard ANSI/EIA-632,the proposed process systematically restructures available data on a manufacturing system and its elements and then provides complete system behaviour to build a simulation model.A case study on a cooling water control system in a hot strip mill convincingly demonstrates the applicability and effectiveness of the proposed process.

关键词： Behaviour extraction manufacturing systems simulation model system behaviour systems engineering

Surface-enhanced Raman spectroscopy for emerging contaminant analysis in drinking water

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Frontiers of Environmental Science & Engineering 2023年第5期17卷 51-65页

作者： Seo Won cho Haoran Wei Environmental Chemistry and Technology Program University of Wisconsin–MadisonMadisonWI 53706USA Department of Civil and Environmental Engineering University of Wisconsin–MadisonMadisonWI 53706USA

Emerging contaminants(ECs)in drinking water pose threats to public health due to their environmental prevalence and potential *** occurrence of ECs in our drinking water supplies depends on their physicochemical properties,discharging rate,and susceptibility to removal by water treatment *** health effects of long-term exposure to ECs justify their regular monitoring in drinking water *** this review article,we will summarize the current status and future opportunities of surface-enhanced Raman spectroscopy(SERS)for EC analysis in drinking *** principles of SERS are first introduced and a comparison of SERS and liquid chromatography-tandem mass spectrometry in terms of cost,time,sensitivity,and availability is ***,we discuss the strategies for designing effective SERS sensors for EC analysis based on five categories—per-and polyfluoroalkyl substances,novel pesticides,pharmaceuticals,endocrine-disrupting chemicals,and *** addition to maximizing the intrinsic enhancement factors of SERS substrates,strategies to improve hot spot accessibilities to the targeting ECs are equally *** is a review article focusing on SERS analysis of ECs in drinking *** discussions are not only guided by numerous endeavors to advance SERS technology but also by the drinking water regulatory policy.

关键词： Emerging contaminant Surface-enhanced Raman spectroscopy Drinking water monitoring Sensor Regulatory policy

A geometric characterisation of real C^(*)-algebras

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Science China Mathematics 2023年第10期66卷 2277-2292页

作者： cho-Ho Chu School of Mathematical Sciences Queen Mary University of LondonLondon E 14NSUK

We characterise the positive cone of a real C^(*)-algebra *** an open coneΩin a real Banach space V,with the closureΩ,we show thatΩis the interior of the positive cone of a unital real C^(*)-algebra if and only if it is a Finsler symmetric cone with an orientable extension,which is equivalent to the condition that V is,in an equivalent norm,the Hermitian part of a unital real C^(*)-algebra with the positive coneΩ.

关键词： real C^(*)-algebra Banach manifold Finsler symmetric cone Jordan algebra

Finite Group Action and Gromov-Witten Invariants in Symplectic Four-Manifolds

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Acta Mathematica Sinica,English Series 2010年第12期26卷 2325-2334页

作者： Yong Seung cho Department of Mathematics Ewha Womans University

Let a finite group act semi-freely on a closed symplectic four-manifold with a 2-dimensional fixed point set. Then we show that the relative Gromov-Witten invariants are the same as the invariants on the quotient set-... 详细信息

关键词： Finite group action Gromov-Witten invariant symplectic four-manifold

SANDWICH-TYPE THEOREMS FOR MEROMORPHIC MULTIVALENT FUNCTIONS ASSOCIATED WITH THE LIU-SRIVASTAVA OPERATOR

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Acta Mathematica Scientia 2012年第3期32卷 929-941页

作者： Nak Eun cho Department of Applied Mathematics Pukyong National UniversityBusan 608-737Korea

The purpose of this article is to obtain some subordination and superordi- nation preserving properties of meromorphic multivalent functions in the punctured open unit disk associated with the Liu-Srivastava operator.... 详细信息

关键词： Subordination superordination meromorphic multivalent function Liu- Srivastava operator sandwich-type result

Study on adhesively-bonded surface of tapered double cantilever specimen made of aluminum foam affected with shear force

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Journal of Central South University 2015年第12期22卷 4521-4527页

作者：孙洪鹏 cho Jae-ung Division of Mechanical Engineering Graduate School Kongju National University Division of Mechanical and Automotive Engineering Kongju National University

Aluminum foam is widely used in diverse areas to minimize the weight and maximize the absorption of shock energy in lightweight structures and various *** presents a number of advantages,such as low density,incombustibility,non-rigidity,excellent energy absorptivity,sound absorptivity and low heat *** aluminum foam with an air cell structure was placed under the TDCB Mode II tensile load by using Landmark equipment manufactured by MTS to examine the shear failure *** angle of the tapered adhesively-bonded surfaces of specimens was designated as a variable,and three models were developed with the inclined angles differing from one another at 6°,8° and 10°.The specimens with the inclined angles of 6°,8° and 10° have the maximum reaction forces of 168 N,194 N when the forced displacements are 6,5 and 4.2 mm *** are three specimens with the inclined angles of 10°,8° and 6° in the order of maximum reaction *** the analysis result,the maximum equivalent stresses of 0.813 MPa and 0.895 MPa happened when the forced displacements of 6 mm and 5 mm proceeded at the models of 6° and 8°,respectively.A simulation was carried out on the basis of finite element method and the experimental *** results of the experiment and the simulation analysis are shown not different from each other ***,only a simulation could be confirmed to be performed in substitution of an experiment,which is costly and time-consuming in order to determine the shearing properties of materials made of aluminum foam with artificial data.

关键词： adhesive displacement force reaction shearing fracture characteristic tapered double cantilever beam(TDCB)