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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

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 1. Key Laboratory for Organic Electronics & Information Displays (KLOEID) Institute of Advanced Materials (iam) Nanjing University of Posts & Telecommunications Nanjing 210046 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

An application of the Riemann-Roch theorem

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Science China Mathematics 2008年第4期51卷 765-772页

作者： WANG ShiKun~1 ZHANG HuiPing~(2+) 1 KLMM and iam AMSS Chinese Academy of Sciences Beijing 100080 China 2 School of Information Renmin University of China Beijing 100872 China 1. KLMM and iam AMSS Chinese Academy of Sciences Beijing 100080 China 2. School of Information Renmin University of China Beijing 100872 China

Applying the Riemann-Roch theorem,we calculate the dimension of a kind of mero- morphicλ-differentials’ space on compact Riemann *** we also construct a basis of theλ-differentials’ *** the main result,the Cauchy ... 详细信息

关键词： Riemann-Roch theorem λ-differential annulus domain Cauchy integral formula 14C40

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孕期的口腔问题不能看运气

生活与健康 2019年第5期 52-55页

作者： iam 丹提斯特口腔科普

现在养育小孩都得“精打细算",别说是培养一个小孩难,如今怀一个小孩也难,各种“风险"考验着准妈妈们的心理承受能力。口腔医生不幸“被”成为阻碍防线中的一员,因为当你怀孕的时候,可能都会听说过下面的警告:×××怀孕不能补牙,不能... 详细信息

现在养育小孩都得“精打细算",别说是培养一个小孩难,如今怀一个小孩也难,各种“风险"考验着准妈妈们的心理承受能力。口腔医生不幸“被”成为阻碍防线中的一员,因为当你怀孕的时候,可能都会听说过下面的警告:×××怀孕不能补牙,不能根管治疗,不能拔牙…

关键词：口腔医生运气孕期心理承受能力根管治疗小孩准妈妈怀孕

Organic thin-film solar cells:Devices and materials

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Science China Chemistry 2012年第4期55卷 553-578页

作者： LI ZhiGang1, ZHAO XinYan2, LI Xin1,2, GAO ZhiQiang1, MI BaoXiu1 & HUANG Wei2 1Jiangsu Engineering Centre for Flat-Panel Displays & Solid-state Lighting and School of Materials Science & Engineering, Nanjing University of Posts & Telecommunications, Nanjing 210046, China 2Key Laboratory for Organic Electronics & Information Displays (KLOEID) Institute of Advanced Materials (iam), Nanjing University of Posts & Telecommunications, Nanjing 210046, China 1. Jiangsu Engineering Centre for Flat-Panel Displays & Solid-state Lighting and School of Materials Science & Engineering Nanjing University of Posts & Telecommunications Nanjing 210046 China2. Key Laboratory for Organic Electronics & Information Displays (KLOEID) Institute of Advanced Materials (iam) Nanjing University of Posts & Telecommunications Nanjing 210046 China

In recent years, the performance of organic thinfilm solar cells has gained rapid progress, of which the power conversion efficiencies （r/p） of 3%-5% are commonly achieved, which were difficult to obtain years ago and are improving steadily now. The r/p of 7.4% was achieved in the year 2010, and r/p of 9.2% was disclosed and confirmed at website of Mitsubishi Chemical in April, 2011. The promising future is that the r/p of 10% is achievable according to simulation results. Apparently, these are attributed to material innovations, new device structures, and also the better understanding of device physics. This article summarizes recent progress in organic thinfilm solar cells related to materials, device structures and working principles. In the device functioning part, after each brief summary of the working principle, the methods for improvements, such as absorption increment, organic/electrode interface engineering, morphological issues, are addressed and summarized accordingly. In addition, for the purpose of increasing exciton diffusion efficiency, the benefit from triplet exciton, which has been proposed in recent years, is highlighted. In the active material parts, the chemical nature of materials and its impact on device performance are discussed. Particularly, emphasis is given toward the insight for better understanding device physics as well as improvements in device performance either by development of new materials or by new device architecture.

关键词： organic – solar cell – photovoltaic – devices – materials

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测量土壤表面水分蒸发量的装置

农业新技术新方法译丛 1995年第1期 42-45,48页

作者： Sae.,iam 王常云