Clustering methods

This study demonstrates that the two-step cluster method is not only more effective than the k-means method in terms of clustering ability but also in data pre-processing. The study's results enable authorities to gain a more detailed understanding of typical traffic accident patterns in Hanoi.

15p vithomson 02-07-2024 0 0   Download

Circulating tumor cell (CTC) clusters play a critical role in carcinoma metastasis. However, the rarity of CTC clusters and the limitations of capture techniques have retarded the research progress. In vitro CTC clusters model can help to further understand the biological properties of CTC clusters and their clinical significance.

17p vishanshan 27-06-2024 1 1   Download

Part 2 of ebook "When luxury meets art: Forms of collaboration between luxury brands and the arts" provides readers with contents including: typology of luxury brand-art collaborations; preliminary methodological remarks; empirical selection and description of luxury brand-art collaborations; determination of different types of luxury brand-art collaborations; closing remarks; evaluation and limitations of the typological study;...

63p giangmacvien 22-06-2024 1 1   Download

This study aimed to identify metabolic subtypes in ESCA, explore their relationship with immune land‑ scapes, and establish a metabolic index for accurate prognosis assessment. Methods Clinical, SNP, and RNA-seq data were collected from 80 ESCA patients from the TCGA database and RNAseq data from the GSE19417 dataset. Metabolic genes associated with overall survival (OS) and progression-free survival (PFS) were selected, and k-means clustering was performed.

16p vikoch 27-06-2024 1 1   Download

The research aims to propose solutions for mergers between Vietnamese securities companies to improve the financial capacity of securities companies currently operating on the Vietnam Stock Exchange - VNX (HNX, HoSE and Upcom exchanges). Through research samples collected from 27 Vietnamese securities companies in the period from 2014 to 2021, secondary data are audited financial statements and financial safety reports. By using the quantitative research method of principal component analysis PCA (Principal Component Analysis) and K-means (cluster) analysis on SPSS 20 software.

8p leminhvu111 07-06-2024 2 0   Download

In relational and object-oriented database systems, fuzzy or uncertain data will always be naturally present. However, these systems have many limitations for handling complex data types of fuzzy nature. Therefore, to represent and process fuzzy data, they need a flexible and efficient fuzzy query system. To solve this challenge, this paper proposes two different approaches to increase the flexibility of the fuzzy interrogation system.

17p viamancio 04-06-2024 0 0   Download

The electronic states of FeSin −/0/+ (n = 1-2) clusters have been investigated with DFT, CASPT2, and DMRGCASPT2 methods. By using relatively large active spaces, the DMRG-CASPT2 method is found to provide highly accurate relative energies for the various relevant electronic states. Leading configurations, bond distances, harmonic vibrational frequencies, and relative energies for the low-lying states of the title clusters are reported.

9p dianmotminh02 03-05-2024 4 2   Download

This article presents computational insights into the geometric and electronic structures of NbSi4 −/0 clusters using density functional theory and the CASSCF/CASPT2 method. The anionic and neutral ground states are identified as the 1A′ and 2A′ states, respectively, within a trigonal bipyramidal isomer where the Nb atom occupies the equatorial position. The adiabatic detachment energy for the transition from the anionic ground state 1A′ to the neutral ground state 2A′ is estimated to be 2.30 eV.

8p dianmotminh02 03-05-2024 4 2   Download

This article develops an approach to forming innovative development clusters in Kazakhstan’s chemical industry as an opportunity to promote the effectiveness of the sector’s development and to increase its competitive advantage based on the supply chain management. An expert evaluation method is used to form a system of indicators for assessing innovative development in the country’s regional chemical industry.

11p longtimenosee10 26-04-2024 3 1   Download

The aim of this research is to examine the effects of creative writing activities on the reading and writing attitudes of fourth grade students. This research is a one-group pretest-posttest design of quantitative research methods. The study population of the study is the fourth grade students who are studying in Sorgun district of Yozgat province in Turkey. Cluster sampling was used in the sampling selection.

8p viarnault 25-04-2024 4 1   Download

Students' academic self-concept is a concerning concept in educational research. The purpose of this research is to examine the simultaneous influence and relationship of learning motivation, democratic parenting, and peer relations with academic selfconcept in students. This is a correlational research with a cluster random sampling method used to collect data from 962 students.

13p viarnault 25-04-2024 3 1   Download

Ebook "Many-body methods for atoms, molecules and clusters" provides an introduction to many-body methods for applications in quantum chemistry. These methods, originating in field-theory, offer an alternative to conventional quantum-chemical approaches to the treatment of the many-electron problem in molecules.

330p tracanhphuonghoa1007 22-04-2024 4 3   Download

Ebook "Multi-shell polyhedral clusters" presents new methodologies and rationalizes existing methods that are used in the design of multi-shell polyhedral clusters. The author describes how the methods used are extended from 2D-operations on maps to 3D (and higher dimensional) Euclidean space. A variety of structures is designed and described in detail and classified giving rise to an atlas of multi-shell nanostructures. The book therefore sheds a new light on the field of crystal and quasicrystal structures, an important part of nanoscience and nanotechnology.

451p tracanhphuonghoa1007 22-04-2024 5 3   Download

Ebook "Practical aspects of computational chemistry IV" covers recent developments and current applications covering nanomaterials, hydrogen-bonded clusters, semiempirical local coupled-cluster theory, charge-transfer coupling, ro-vibrational energy levels, relativistic effects and quantum electrodynamics in chemistry, mechanochemistry, passivation on metal oxide surfaces, and nano-QSAR.

400p tracanhphuonghoa1007 22-04-2024 3 3   Download

Supply chain and tourism cluster are the two important ways to enhance the competitiveness of regions or industries. By discussing the differences and links between the two, this paper concludes that tourism cluster and supply chain carry features of compatibility and symbiosis. The importance of this research paper is determined by the fact that a significant number of tourism clusters established in the territory of the Russian Federation are not always successful as catalysts for the tourism sector development.

12p longtimenosee09 08-04-2024 3 1   Download

Many mutations in cancer are of unknown functional significance. Standard methods use statistically significant recurrence of mutations in tumor samples as an indicator of functional impact. We extend such analyses into the long tail of rare mutations by considering recurrence of mutations in clusters of spatially close residues in protein structures.

13p vioraclene 31-03-2024 1 1   Download

We present Beyondcell, a computational methodology for identifying tumour cell subpopulations with distinct drug responses in single-cell RNA-seq data and proposing cancer-specific treatments. Our method calculates an enrichment score in a collection of drug signatures, delineating therapeutic clusters (TCs) within cellular populations.

15p vibransone 28-03-2024 2 1   Download

In ebook "Dielectric properties of isolated clusters: Beam deflection studies" a broad range of state-of-the-art methods to determine properties of clusters are presented. The experimental setup and underlying physical concepts of these experiments are described. Furthermore, existing theoretical models to explain the experimental observations are introduced and the possibility to deduce structural information from measurements of dielectric properties is discussed.

102p tudohanhtau1006 29-03-2024 2 1   Download

Ebook "Computational organometallic chemistry" addressed include: DFT studies on zirconium-mediated reactions, force field methods in organometallic chemistry, hydrogenation of π-systems, oxidative functionalization of unactivated C-H bonds and olefins, the osmylation reaction, and cobalt carbonyl clusters.

262p coduathanh1122 27-03-2024 3 1   Download

Ebook "Computational biology: Issues and applications in oncology" provides a comprehensive report on recent techniques and results in computational oncology essential to the knowledge of scientists, engineers, as well as postgraduate students working on the areas of computational biology, bioinformatics, and medical informatics. With chapters timely prepared and written by experts in the field, this in-depth and up-to-date volume covers advanced statistical methods, heuristic algorithms, cluster analysis, data modeling, image and pattern analysis applied to cancer research.

309p cotieubac1004 15-03-2024 4 0   Download