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New Spam Filtering Method with Hadoop Tuning-Based MapReduce Naïve Bayes

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Computer Systems Science & Engineering 2023年第4期45卷 201-214页

作者： Keungyeup Ji Youngmi kwon Department of Radio and Information Communications Engineering Chungnam National UniversityDaejeon34134Korea

As the importance of email increases,the amount of malicious email is also increasing,so the need for malicious email filtering is *** it is more economical to combine commodity hardware consisting of a medium server or PC with a virtual environment to use as a single server resource and filter malicious email using machine learning techniques,we used a Hadoop MapReduce framework and Naïve Bayes among machine learning methods for malicious email ***ïve Bayes was selected because it is one of the top machine learning methods(Support Vector Machine(SVM),Naïve Bayes,K-Nearest Neighbor(KNN),and Decision Tree)in terms of execution time and *** email was filtered with MapReduce programming using the Naïve Bayes technique,which is a supervised machine learning method,in a Hadoop framework with optimized performance and also with the Python program technique with the Naïve Bayes technique applied in a bare metal server environment with the Hadoop environment not *** to the results of a comparison of the accuracy and predictive error rates of the two methods,the Hadoop MapReduce Naïve Bayes method improved the accuracy of spam and ham email identification 1.11 times and the prediction error rate 14.13 times compared to the non-Hadoop Python Naïve Bayes method.

关键词： Hadoop hadoop distributed file system(HDFS) MapReduce configuration parameter malicious email filtering Naïve Bayes

Application of artificial intelligence to rock mechanics:An overview

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Journal of Rock Mechanics and Geotechnical Engineering 2021年第1期13卷 248-266页

作者： Abiodun Ismail Lawal Sangki kwon Department of Energy Resources Engineering Inha UniversityYong-Hyun DongNam KuIncheonSouth Korea Department of Mining Engineering Federal University of TechnologyAkureNigeria

Different artificial intelligence(AI)methods have been applied to various aspects of rock mechanics,but the fact that none of these methods have been used as a standard implies that doubt as to their generality and validity still *** this,a literature review of application of AI to the field of rock mechanics is *** studies of the researches published in the top journals relative to the fields of rock mechanics,computer applications in engineering,and the textbooks were *** performances of the AI methods that have been used in rock mechanics applications were *** literature review shows that AI methods have successfully been used to solve various problems in the rock mechanics field and they performed better than the traditional empirical,mathematical or statistical ***,their practical applicability is still an issue of concern as many of the existing AI models require some level of expertise before they can be used,because they are not in the form of tractable mathematical *** some advanced AI methods are still yet to be *** limited availability of dataset for the AI simulations is also identified as a major *** solutions to the identified problems and the possible future research focus were proposed in the study subsequently.

关键词： Artificial intelligence(AI) Rock mechanics Literature review Statistical method

Development of mathematically motivated hybrid soft computing models for improved predictions of ultimate bearing capacity of shallow foundations

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第3期15卷 747-759页

作者： Abiodun Ismail Lawal Sangki kwon Department of Energy Resources Engineering Inha UniversityIncheonSouth Korea Department of Mining Engineering Federal University of TechnologyAkureNigeria

Ultimate bearing capacity(UBC)is a key subject in geotechnical/foundation engineering as it determines the limit of loads imposed on the *** most reliable means of determining UBC is through experiment,but it is costly and time-consuming which has led to the development of various models based on the simplified *** outcomes of the models are usually validated with the experimental results,but a large gap usually exists between ***,a model that can give a close prediction of the experimental results is *** study proposes a grasshopper optimization algorithm(GOA)and salp swarm algorithm(SSA)to optimize artificial neural networks(ANNs)using the existing UBC experimental *** performances of the proposed models are evaluated using various statistical *** obtained results are compared with the existing *** proposed models outperformed the existing *** proposed hybrid GOA-ANN and SSA-ANN models are then transformed into mathematical forms that can be incorporated into geotechnical/foundation engineering design codes for accurate UBC measurements.

关键词： Ultimate bearing capacity(UBC) Geotechnics Grasshopper optimization algorithm(GOA) Salp swarm algorithm(SSA) Soft computing(SC)method

The two faces of IL-2: a key driver of CD8^(+)T-cell exhaustion

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Cellular & Molecular Immunology 2021年第7期18卷 1641-1643页

作者： Byungsuk kwon School of Biological Sciences University of UlsanUlsanRepublic of Korea

The body undergoes abnormal,pathological immune responses when antigens are present at too great an excess for the immune system to handle or the body is persistently exposed to *** etiology of many types of chronic diseases is partially related to such conditions;thus,understanding the pathophysiological processes of these chronic diseases is of paramount importance for therapeutic purposes.A recent paper published in Nature Immunology revealed the unexpected involvement of the T cell-activating cytokine interleukin(IL)-2 in counteracting the immune attack on tumors,a finding that will provide new options for cancer therapy.

关键词： involvement diseases Immunology

Regulatory roles of dermal type 2 innate lymphoid cells

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Cellular & Molecular Immunology 2013年第6期10卷 453-455页

作者： Byungsuk kwon School of Biological Sciences University of Ulsan Ulsan Korea

Type 2 immune immunity evolved a unique system to protect against noxious xenobiotics at the epithelial bar- rier） Recently, epithelial cell-derived cytokines IL-25, IL-33 and TSLP have been shown to be critical in producing Th2 cytokines, including IL-4, IL-5, IL- 9 and IL-13, eby type 2 innate lymphoid cells （ILC2s） as well as Th2 cells.

关键词： Th2细胞白细胞介素13 白细胞介素4 白细胞介素5 淋巴细胞淋巴细胞亚群细胞因子类血气分析

Functionally Graded Dual-nanoparticulate-reinforced Aluminium Matrix Bulk Materials Fabricated by Spark Plasma Sintering

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Journal of Materials Science & Technology 2014年第8期30卷 736-742页

作者： Hansang kwon Marc Leparoux Akira Kawasaki Department of Materials System Engineering Pukyong National University365 Sinsenro608-759 BusanKorea Empa Swiss Federal Laboratories for Materials Science and TechnologyAdvanced Materials ProcessingFeuerwerkerstrasse 39CH-3602 ThunSwitzerland Department of Materials Processing Engineering Graduate School of EngineeringTohoku University980-8579 SendaiJapan

Functionally graded（FG） carbon nanotubes（CNT） and nano-silicon carbide（nSiC） reinforced aluminium（Al）matrix composites have been successfully fabricated using high-energy ball milling followed by solid-state spark plasma sintering *** CNTs were well-dispersed in the Al particles using the nSiC as a solid mixing *** different types of multi-walled CNTs were used to add different amounts of CNTs in the same *** ball milled Al—CNT—nSiC and Al—CNT powder mixtures were fully densified and demonstrated good adhesion with no serious microcracks and pores within an FG multilayer *** layer contained different amounts of the CNTs,and the nSiC additions showed different microstructures and *** is possible to control the characteristics of the FG multilayer composite through the efficient design of an Al—CNT—nSiC gradient *** concept offers a feasible approach for fabricating the dualnanoparticulate-reinforced Al matrix nanocomposites and can be applied to other scenarios such as polymer and ceramic systems.

关键词： Carbon nanotubes(CNT) Silicon carbide High-energy ball milling Spark plasma sintering(SPS) Functionally graded materials(FGM)

Emotional inference by means of Choquet integral and λ-fuzzy measurement in consideration of ambiguity of human mentality

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Journal of Central South University 2016年第1期23卷 160-168页

作者： kwon Il-kyoung LEE Sang-yong Division of Computer Science & Engineering Kongju National University Department of Computer Science & Engineering Kongju National University

Research on human emotions has started to address psychological aspects of human nature and has advanced to the point of designing various models that represent them quantitatively and systematically. Based on the findings, a method is suggested for emotional space formation and emotional inference that enhance the quality and maximize the reality of emotion-based personalized services. In consideration of the subjective tendencies of individuals, AHP was adopted for the quantitative evaluation of human emotions, based on which an emotional space remodeling method is suggested in reference to the emotional model of Thayer and Plutchik, which takes into account personal emotions. In addition, Sugeno fuzzy inference, fuzzy measures, and Choquet integral were adopted for emotional inference in the remodeled personalized emotional space model. Its performance was evaluated through an experiment. Fourteen cases were analyzed with 4.0 and higher evaluation value of emotions inferred, for the evaluation of emotional similarity, through the case studies of 17 kinds of emotional inference methods. Matching results per inference method in ten cases accounting for 71% are confirmed. It is also found that the remaining two cases are inferred as adjoining emotion in the same section. In this manner, the similarity of inference results is verified.

关键词： fuzzy measure fuzzy integral emotional model emotion space AHP fuzzy inference system Choquet integral

Kinematic Analysis of the Neck and Upper Extremities During Walking in Healthy Young Adults

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Journal of Bionic Engineering 2011年第3期8卷 305-312页

作者： kwon Son Junghong Park Seonghun Park School of Mechanical Engineering Pusan National University Busan 609-735 Republic of Korea

The objective of this paper is to quantify the local stabilities of the neck and upper extremities （right/left shoulders and right/left elbows）, and investigate differences between linear and nonlinear measurements of the associated joint motions and differences in the local stability between the upper and lower extremities. This attempt involves the calculation of a nonlinear parameter, Lyapunov Exponent （LE）, and a linear parameter, Range of Motion （ROM）, during treadmill walking in conj unction with a large population of healthy subjects. Joint motions of subjects were captured using a three-dimensional motion-capture system. Then mathematical chaos theory and the Rosenstein algorithm were employed to calculate LE of joints as the extent of logarithmic divergence between the neighboring state-space trajectories of flexion-extension angles. LEs computed over twenty males and twenty females were 0.037~0.023 for the neck, 0.043＋0.021 for the right shoulder, 0.045i0.030 for the left shoulder, 0.032i0.021 for the right elbow, and 0.034~0.026 for the left elbow. Although statistically significant difference in the ROM was observed between all pairs of the neck and upper extremity joints, differences in the LE between all pairs of the joints as well as between males and females were not statistically significant. Between the upper and lower extremities, LEs of the neck, shoulder, and elbow were significantly smaller than those of the hip （-0.064） and the knee （-0,062）. These results indicate that a statistical difference in the local stability between the upper extremity joints is not significant. However, the different result between the ROM and LE gives a strong rationale for applying both linear and nonlinear tools together to the evaluation of joint movement. The LEs of the joints calculated from a large population of healthy subjects could provide normative values for the associated joints and can be used to evaluate the recovery progress of patients with joint rel

关键词： kinematic analysis Lyapunov exponent range of motion chaos theory upper extremities

Improved estimation of rotor position for sensorless control of a PMSM based on a sliding mode observer

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Journal of Central South University 2016年第7期23卷 1643-1656页

作者： Wahyu Kunto Wibowo Seok-kwon Jeong Department of Electrical Engineering Universitas Pertamina Refrigeration and Air-Conditioning Engineering Pukyong National University

This work proposes a new strategy to improve the rotor position estimation of a permanent magnet synchronous motor(PMSM) over wide speed range. Rotor position estimation of a PMSM is performed by using sliding mode observer(SMO). An adaptive observer gain was designed based on Lyapunov function and applied to solve the chattering problem caused by the discontinuous function of the SMO in the wide speed range. The cascade low-pass filter(LPF) with variable cut-off frequency was proposed to reduce the chattering problem and to attenuate the filtering capability of the SMO. In addition, the phase shift caused by the filter was counterbalanced by applying the variable phase delay compensation for the whole speed area. High accuracy estimation result of the rotor position was obtained in the experiment by applying the proposed estimation strategy.

关键词： rotor position estimation permanent magnet synchronous motor sliding mode observer adaptive observer gain cascadelow-pass filter variable cut-off frequency variable phase delay compensation