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Profiling Astronomical Objects Using Unsupervised Learning Approach

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Computers, Materials & Continua 2023年第1期74卷 1641-1655页

作者： Theerapat Sangpetch Tossapon Boongoen Natthakan iam-On Center of Excellence in AI and Emerging Technologies School of Information TechnologyMae Fah Luang UniversityChiang Rai57100Thailand Department of Computer Science Aberystwyth UniversityAberystwythCeredigionUK

Attempts to determine characters of astronomical objects have been one of major and vibrant activities in both astronomy and data science *** of a manual inspection,various automated systems are invented to satisfy the need,including the classification of light curve profiles.A specific Kaggle competition,namely Photometric LSST Astronomical Time-Series Classification Challenge(PLAsTiCC),is launched to gather new ideas of tackling the abovementioned task using the data set collected from the Large Synoptic Survey Telescope(LSST)*** all proposed methods fall into the supervised family with a common aim to categorize each object into one of pre-defined *** this challenge focuses on developing a predictive model that is robust to classifying unseen data,those previous attempts similarly encounter the lack of discriminate features,since distribution of training and actual test datasets are largely *** a result,well-known classification algorithms prove to be sub-optimal,while more complicated feature extraction techniques may help to slightly boost the predictive *** such a burden,this research is set to explore an unsupervised alternative to the difficult quest,where common classifiers fail to reach the 50%accuracy mark.A clustering technique is exploited to transform the space of training data,from which a more accurate classifier can be *** addition to a single clustering framework that provides a comparable accuracy to the front runners of supervised learning,a multiple-clustering alternative is also introduced with improved *** fact,it is able to yield a higher accuracy rate of 58.32%from 51.36%that is obtained using a simple *** this difficult problem,it is rather good considering for those achieved by well-known models like support vector machine(SVM)with 51.80%and Naive Bayes(NB)with only 2.92%.

关键词： Astronomy sky survey light curve data classification data clustering

Classification of Adversarial Attacks Using Ensemble Clustering Approach

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Computers, Materials & Continua 2023年第2期74卷 2479-2498页

作者： Pongsakorn Tatongjai Tossapon Boongoen Natthakan iam-On Nitin Naik Longzhi Yang Center of Excellence in AI&Emerging Technologies School of ITMae Fah Luang UniversityChiang RaiThailand Department of Computer Science Aberystwyth UniversityAberystwythUnited Kingdom School of Informatics and Digital Engineering Aston UniversityBirminghamUnited Kingdom Department of Computer and Information Sciences Northumbria UniversityNewcastleUnited Kingdom

As more business transactions and information services have been implemented via communication networks,both personal and organization assets encounter a higher risk of *** safeguard these,a perimeter defence likeNIDS(network-based intrusion detection system)can be effective for known *** has been a great deal of attention within the joint community of security and data science to improve machine-learning based NIDS such that it becomes more accurate for adversarial attacks,where obfuscation techniques are applied to disguise patterns of intrusive *** current research focuses on non-payload connections at the TCP(transmission control protocol)stack level that is applicable to different network *** contrary to the wrapper method introduced with the benchmark dataset,three new filter models are proposed to transform the feature space without knowledge of class *** ECT(ensemble clustering based transformation)techniques,i.e.,ECT-Subspace,ECT-Noise and ECT-Combined,are developed using the concept of ensemble clustering and three different ensemble generation strategies,i.e.,random feature subspace,feature noise injection and their *** on the empirical study with published dataset and four classification algorithms,new models usually outperform that original wrapper and other filter alternatives found in the *** is similarly summarized from the first experiment with basic classification of legitimate and direct attacks,and the second that focuses on recognizing obfuscated *** addition,analysis of algorithmic parameters,i.e.,ensemble size and level of noise,is provided as a guideline for a practical use.

关键词： Intrusion detection adversarial attack machine learning feature transformation ensemble clustering

The benefit of curative liver resection with a selective bile duct preserving approach for hepatocellular carcinoma with macroscopic bile duct tumor thrombus

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Hepatobiliary Surgery and Nutrition 2020年第6期9卷 729-738页

作者： Anon Chotirosniramit Akkaphod Liwattanakun Sunhawit Junrungsee Wasana Ko-iam Trichak Sandhu Worakitti Lapisatepun Division of Hepatobiliary and Pancreatic Surgery Department of SurgeryFaculty of MedicineChiang Mai University HospitalChiang MaiThailand

Background:Hepatocellular carcinoma(HCC)presenting with macroscopic bile duct tumor thrombus(BDTT)is an uncommon *** role of a curative hepatic resection and associated long-term outcomes remain *** addition the necessity for bile duct resection is still *** aim of this study was to evaluate outcomes of hepatectomy with a selective bile duct preservation approach for HCC with BDTT in comparison to outcomes without ***:A total of 22 HCC with BDTT patients who had undergone curative hepatic resection with a selective bile duct preservation approach at our institute were retrospectively *** were compared to group of 145 HCC without BDTT *** impact of curative surgical resection and BDTT on clinical outcomes and survival after surgical resection were ***:All HCC with BDTT cases underwent major hepatectomy vs.32.4%in the comparative *** duct preservation rate was 56.5%.The 1-,3-and 5-year survival rates of HCC with BDTT patients in comparison to the HCC without BDTT group were 81.8%,52.8%and 52.8%vs.73.6%,55.6%and 40.7%(P=0.804)*** resection margin,tumor size≥5 cm and AFP≥200 IU/mL were significant risk factors regarding overall ***,it is unclear whether presence of a bile duct tumor thrombus has an adverse impact on either recurrence free survival or overall ***:Bile duct obstruction from tumor thrombus did not necessarily indicate an advanced form of *** size and AFP had greater impact on long-term outcomes than bile duct tumor *** liver resection with a selective bile duct preserving approach in HCC with BDTT can achieve favorable outcomes comparable to those of HCC without BDTT in selected patients.

关键词： Hepatocellular carcinoma(HCC) bile duct tumor thrombus(BDTT) bile duct preserve outcomes

Machine learning in concrete science:applications,challenges,and best practices

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npj Computational Materials 2022年第1期8卷 1192-1208页

作者： Zhanzhao Li Jinyoung Yoon Rui Zhang Farshad Rajabipour wil V.Srubar III Ismaila Dabo Aleksandra Radlińska Department of Civil and Environmental Engineering The Pennsylvania State UniversityUniversity ParkPA16802USA Department of Structural Engineering Research Korea Institute of Civil Engineering and Building Technology(KICT)Goyang-si10223Republic of Korea Department of Civil Environmentaland Architectural EngineeringUniversity of Colorado BoulderBoulderCO80309USA Materials Science and Engineering Program University of Colorado BoulderBoulderCO80309USA Department of Materials Science and Engineering The Pennsylvania State UniversityUniversity ParkPA16802USA

Concrete,as the most widely used construction material,is inextricably connected with human *** conceptual and methodological progress in concrete science,concrete formulation for target properties remains a challenging task due to the ever-increasing complexity of cementitious *** the ability to tackle complex tasks autonomously,machine learning(ML)has demonstrated its transformative potential in concrete *** the rapid adoption of ML for concrete mixture design,there is a need to understand methodological limitations and formulate best practices in this emerging computational ***,we review the areas in which ML has positively impacted concrete science,followed by a comprehensive discussion of the implementation,application,and interpretation of ML *** conclude by outlining future directions for the concrete community to fully exploit the capabilities of ML models.

关键词： concrete directions autonomous

PREMISE Insect Model： Integrated Population Dynamics Model for the Ex-ante Evaluation of IPM against Insect Pest

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Journal of Agricultural Science and Technology(B) 2015年第4期5卷 231-240页

作者： wil Hennen Aude Alaphilippe Agricultural Economics Research Institute (Wageningen UR-LEI) P.O. Box 29703 2502 LS The Hague The Netherlands INRA UERI Domaine de Gotheron F-26320 Saint Marcel-les-Valence France

Codling moth Cydiapomonella L. is the most serious pest of apple and pear worldwide and causes damage and decreased yields. To minimize this risk, IPM tools can be applied to reduce the use of chemicals. A cost-effective application of IPM depends on the number of insects at the time of application. Several conditions and factors influence the lifecycle and numbers of generations within a year. In order to perform ex-ante evaluations of the cost-effectiveness of IPM measures against pest insects, the generic PREMISE insect model has been developed, which integrates insect＇s population dynamics, the climate and other conditions, applied measures, economics, environment and human health （residues）. This paper describes these components of the PREMISE insect model, and how these components interact to assess the cost-effectiveness of IPM measures and the effects on the environment and human health. Codling moth is used as a case study for this generic model.

关键词： IPM integrated model population dynamics economics environment residues codling moth.

Triazatruxene-containing hyperbranched polymers:Microwave-assisted synthesis and optoelectronic properties

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Science China Chemistry 2010年第12期53卷 2472-2480页

作者： LAI WenYong,LIU Dong & HUANG Wei Key Laboratory for Organic Electronics & Information Displays (KLOEID) Institute of Advanced Materials (iam),Nanjing University of Posts & Telecommunications,Nanjing 210046,China Key Laboratory for Organic Electronics & Information Displays (KLOEID) Institute of Advanced Materials (iam) Nanjing University of Posts & Telecommunications Nanjing China

Hyperbranched polymer structures represent a class of high-functionality building blocks with excellent three-dimensional topology for the construction of highly substituted conjugated *** this contribution,an efficient microwave synthesis protocol toward the synthesis of conjugated hyperbranched polymers is presented.A novel series of soluble hyperbranched polyfluorenes (PTF1-PTF3) incorporating triazatruxene moiety as the branch units with various branching degrees have thus been successfully constructed with good yields and high molecular weight via a facile "A2+B2+C3" *** structures of the hyperbranched polymers were confirmed by NMR and *** thermal,optical,and electrochemical properties of the hyperbranched polymers were also *** results showed that introduction of triazatruxene units into the hyperbranched structure endowed the polymer with good thermal stability and highly amorphous *** investigation of PTFx revealed strong blue emission in both solution and solid *** polymers with higher degree of branching and proper content of linear fluorene units exhibited better photophysical properties in terms of narrow emission spectra and relatively high quantum efficiency as well as improved thermal spectral *** triazatruxene branching unit also played a role in raising the HOMO energy levels relative to those of polyfluorenes that would help to improve the charge injection and transport *** incorporation of triazatruxene unit into hyperbranched polymers has thus explored an effective avenue for constructing optoelectronic polymers with improved functional characteristics.

关键词： hyperbranched polymers microwave synthesis triazatruxene polyfluorene blue emission

A Thai family with hereditary pancreatitis and increased cancer risk due to a mutation in PRSS1 gene

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World Journal of Gastroenterology 2005年第11期11卷 1634-1638页

作者： Theeraphong Pho-iam Wanna Thongnoppakhun Pa-Thai Yenchitsomanus Chanin Limwongse Division of Molecular Genetics Division of Medical Genetics

AIM: To investigate mutation of serine protease 1-cationic trypsinogen (CT, PRSS1) gene in members of a Thai family with hereditary pancreatitis and pancreatic cancer. METHODS: Polymerase chain reaction and direct sequencing were performed to analyze the PRSS1 gene in two members of the family affected by pancreatitis. Allele specific amplification (ASA) method was then developed to detect the mutation of the PRSS1 gene in all available members of the family and normal control subjects. RESULTS: A cytosine (C) to thymine (T) mutation at position 2441 (g.2441C>T) of the PRSS1 gene, which results in a substitution of arginine by cysteine at position 116 (R116C) of CT, was identified by direct sequencing in both clinically affected members of the family but was not found in the unaffected member. This mutation, which might be arising from deamination of methylated cytosine in CpG dinucleotide of codon 116 (CGT>TGT), was also detected by the ASA method in the two affected members and a proband's brother but was not observed in unaffected members and 54 normal control subjects. CONCLUSION: Autosomal dominant pancreatitis with increased cancer risk in the studied Thai family is most likely due to missense (R116C) mutation in the PRSS1 gene.

关键词： PRSS1 Hereditary pancreatitis Pancreatic cancer Thai R116C

Additional Overloading Assessment for Future Low Voltage Networks Based on Smart Metering

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Journal of Energy and Power Engineering 2013年第5期7卷 917-927页

作者： Petr Kadurek Sjef Cobben wil Kling Electrical Energy Systems Faculty of Electrical Engineering Eindhoven University of Technology Eindhoven 5600 - 5658 TheNetherlands Alliander Arnhem 6812 AH The Netherlands

The purpose of this article is to present an additional overloading assessment scheme to the current protection scheme, which can be applied in the low voltage distribution network to prevent overloading of network assets. As higher penetration of distributed generators is envisioned among distribution networks, the network operators will have an challenging task in the future to maintain the reliability and quality of supply. The distribution networks are going to be challenged simultaneously by increasing penetration of distributed generators and by increasing loading （inter alia heat pumps, air conditioners or electric vehicles）, which will change the operational perspective of the future distribution networks. Presented simulation results show that the increasing penetration of those appliances can jeopardize the functionality of current protection scheme in distribution networks. Therefore, an additional scheme for assessment of network overloading applicable at low voltage distribution networks is proposed and the application of this scheme, supported by smart metering infrastructure, is demonstrated in a case study. The proposed overloading assessment scheme should help the network operators to increase the flexibility of distribution networks, their hosting capacity, safety and reliability.

关键词： Smart grids power system protection power system reliability power distribution.

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