Secure and Energy Efficient Data Aggregation Technique for Cluster Based Wireless Sensor Network

In the past few years secure transmission of data along with efficiency is a serious issue for wireless sensor networks (WSNs).Clustering is a powerful and convenient way to enhance performance of the WSNs system. In this project work, a secure transmission of data for cluster-based WSNs (CWSNs) is studied, where the clusters are formed dynamically and infrequently. Basically protocols for CWSNs, called SET-IBS (Identity-Based digital Signature)scheme and SET-IBOOS (Identity-Based Online / Offline digital Signature)scheme, correspondingly. In SET-IBS, security relies on the hardness of the Dill-Hellman difficulty in the pairing area. Data aggregation is the process of abbreviation and combining sensor data in order to reduce the amount of data transmission in the network. This paper investigates the relationship between security and data aggregation process in wireless sensor networks. In this paper propose SET-IBS and data aggregation techniques for secure and efficient data transmission. For energy consumption using DRINA algorithm. DRINA means Data Routing for In-Network Aggregation, that has some key aspects such as high aggregation rate, a reduced number of messages for setting up a routing

SISALv3: Speleothem Isotopes Synthesis and AnaLysis database version 3.0

************ NB: This version of the dataset has been superseded by a new iteration - see SISALv3: Speleothem Isotopes Synthesis and AnaLysis database version 3.0 (http://dx.doi.org/10.5287/ora-2nanwp4rk) ************* How to cite this (now superseded) dataset: Kaushal, Nikita, Lechleitner, Franziska, Wilhelm, Micah and SISAL working group members (2023): SISALv3: Speleothem Isotopes Synthesis and AnaLysis database version 3.0. University of Oxford. Dataset. DOI: 10.5287/ora-mzy8pozvk This is a superseded version of this item. Previous versions of the item can be found at the following links: • SISAL (Speleothem Isotopes Synthesis and AnaLysis Working Group) database Version 1.0. (deposited 04 Jun 2018 07:14) • SISAL (Speleothem Isotopes Synthesis and AnaLysis Working Group) database version 1b. (deposited 13 Feb 2019 15:30) • SISAL (Speleothem Isotopes Synthesis and AnaLysis Working Group) database version 2.0. (deposited 20 Feb 2020 11:22) • SISAL (Speleothem Isotopes Synthesis and AnaLysis Working Group) database version 2.0. (deposited 13 Jul 2020 10:07) Stable isotope and trace elements records from speleothems provide information on past climate changes, most particularly information that can be used to reconstruct past changes in precipitation and atmospheric circulation. SISAL (Speleothem Isotope Synthesis and Analysis) is an international working group of the Past Global Changes (PAGES) project. The working group aims to provide a comprehensive compilation of speleothem isotope and trace elements records for climate reconstruction and model evaluation. SISALv3 database contains 831 oxygen isotope, 588 carbon isotope, 94 Mg/Ca, 83 Sr/Ca, 51 Ba/Ca, 25 U/Ca, 29 P/Ca and 14 Sr isotope records from 837 speleothems from 364 cave sites worldwide, and metadata describing the cave settings and age models of these records. This version contains standardized age-depth models. There are also 51 datafiles containing trace element data and 246 image files of cave maps and entity scans. In order to assure traceability, any presentation, report, or publication that uses the SISALv3 database should cite Atsawawaranunt et al. (2018; https://doi.org/10.5194/essd-10-1687-2018), Comas-Bru et al. (2019; https://doi.org/10.5194/cp-15-1557-2019), Comas-Bru et al. (2020; https://doi.org/10.5194/essd-2020-39) and Kaushal et al. (2023; https://doi.org/10.5287/ora-mzy8pozvk). If using individual sites, the literature citations for published work provided in the database should also be cited. Contact information of data contributors of unpublished data is also provided and they should be contacted when unpublished records are used on an individual basis. If cave site or entity (speleothem) images stored into linked repository folder are to be used, corresponding citation, copyright and license information must be adhered to. This information is provided in an excel file in the repository

SISAL (Speleothem Isotopes Synthesis and AnaLysis Working Group) database version 2.0

Stable isotope records from speleothems provide information on past climate changes, most particularly information that can be used to reconstruct past changes in precipitation and atmospheric circulation. SISAL (Speleothem Isotope Synthesis and Analysis) is an international working group of the Past Global Changes (PAGES) project. The working group aims to provide a comprehensive compilation of speleothem isotope records for climate reconstruction and model evaluation. The second version of the SISAL database contains oxygen and carbon isotope measurements from 673 individual speleothem records, and 18 composites from 293 cave systems worldwide, and metadata describing the cave settings and age models of these records. This version also contains 2,138 alternative age-depth models constructed for 503 SISAL entities. In order to assure traceability, any presentation, report, or publication that uses the SISALv2 database should cite Atsawawaranunt et al. (2018; https://doi.org/10.5194/essd-10-1687-2018), Comas-Bru et al. (2019; https://doi.org/10.5194/cp-15-1557-2019) and Comas-Bru et al. (2020; https://doi.org/10.5194/essd-2020-39). If using individual sites, the literature citations for published work provided in the database should also be cited. Contact information of data contributors of unpublished data is also provided and these should be contacted when unpublished records are used on an individual basis

SISALv2: A comprehensive speleothem isotope database with multiple age-depth models

Characterizing the temporal uncertainty in palaeoclimate records is crucial for analysing past climate change, correlating climate events between records, assessing climate periodicities, identifying potential triggers and evaluating climate model simulations. The first global compilation of speleothem isotope records by the SISAL (Speleothem Isotope Synthesis and Analysis) working group showed that age model uncertainties are not systematically reported in the published literature, and these are only available for a limited number of records (ca. 15 %, n = 107=691). To improve the usefulness of the SISAL database, we have (i) improved the database's spatiooral coverage and (ii) created new chronologies using seven different approaches for age depth modelling. We have applied these alternative chronologies to the records from the first version of the SISAL database (SISALv1) and to new records compiled since the release of SISALv1. This paper documents the necessary changes in the structure of the SISAL database to accommodate the inclusion of the new age models and their uncertainties as well as the expansion of the database to include new records and the qualitycontrol measures applied. This paper also documents the age depth model approaches used to calculate the new chronologies. The updated version of the SISAL database (SISALv2) contains isotopic data from 691 speleothem records from 294 cave sites and new age depth models, including age depth temporal uncertainties for 512 speleothems. SISALv2 is available at https://doi.org/10.17864/1947.256 (Comas-Bru et al., 2020a). © 2020 Author(s)

Sentiment Analysis Over Yelp Dataset

This study investigate the Sentiment Analysis for a Business Recommendation System for businesses that use Sentiment Analysis to make the buying experience better for customers. The system uses a set of around 100,000 Yelp reviews to look at customer ratings, comments, and reviews in order to make personalised suggestions. By using information from customer data, this method goes beyond traditional recommendation algorithms. The study uses advanced feature extraction methods like TF-IDF vectorization and BERT tokenization, along with machine learning techniques like DBScan, K-means, and K-Nearest Neighbor (KNN), to rate these models on their accuracy, precision, recall, and F1-score. The results show that the KNN model works best, especially when BERT tokenization is used. The model developed shows great potential. The project’s successfully opens the door for more research into personalised retail solutions that meet customers’ changing needs

SISALv3: Speleothem Isotopes Synthesis and AnaLysis database version 3.0

How to cite this dataset: Kaushal, Nikita, Lechleitner, Franziska, Wilhelm, Micah and SISAL working group members (2024): SISALv3: Speleothem Isotopes Synthesis and AnaLysis database version 3.0. University of Oxford. Dataset. DOI: 10.5287/ora-2nanwp4rk This is the latest version of this item. Previous versions of the item can be found at the following links: • SISAL (Speleothem Isotopes Synthesis and AnaLysis Working Group) database Version 1.0. (deposited 04 Jun 2018 07:14) • SISAL (Speleothem Isotopes Synthesis and AnaLysis Working Group) database version 1b. (deposited 13 Feb 2019 15:30) • SISAL (Speleothem Isotopes Synthesis and AnaLysis Working Group) database version 2.0. (deposited 20 Feb 2020 11:22) • SISAL (Speleothem Isotopes Synthesis and AnaLysis Working Group) database version 2.0. (deposited 13 Jul 2020 10:07) • SISAL (Speleothem Isotopes Synthesis and AnaLysis Working Group) database version 3.0. (deposited 25 Aug 2023 (**NB: This version of the dataset has been superseded by a revised iteration: SISALv3: Speleothem Isotopes Synthesis and AnaLysis database version 3.0 (http://dx.doi.org/10.5287/ora-2nanwp4rk) **) Stable isotope and trace elements records from speleothems provide information on past climate changes, most particularly information that can be used to reconstruct past changes in precipitation and atmospheric circulation. SISAL (Speleothem Isotope Synthesis and Analysis) is an international working group of the Past Global Changes (PAGES) project. The working group aims to provide a comprehensive compilation of speleothem isotope and trace elements records for climate reconstruction and model evaluation. SISALv3 database contains 892 oxygen isotope, 620 carbon isotope, 95 Mg/Ca, 85 Sr/Ca, 52 Ba/Ca, 25 U/Ca, 29 P/Ca and 14 Sr isotope records from 838 speleothems from 365 cave sites worldwide, and metadata describing the cave settings and age models of these records. This version contains standardized age-depth models. There are also 51 datafiles containing trace element data and 246 image files of cave maps and entity scans. In order to assure traceability, any presentation, report, or publication that uses the SISALv3 database should cite Atsawawaranunt et al. (2018; https://doi.org/10.5194/essd-10-1687-2018), Comas-Bru et al. (2019; https://doi.org/10.5194/cp-15-1557-2019), Comas-Bru et al. (2020; https://doi.org/10.5194/essd-2020-39) and Kaushal et al. (2023; https://doi.org/10.5287/ora-mzy8pozvk). If using individual sites, the literature citations for published work provided in the database should also be cited. Contact information of data contributors of unpublished data is also provided and they should be contacted when unpublished records are used on an individual basis. If cave site or entity (speleothem) images stored into linked repository folder are to be used, corresponding citation, copyright and license information must be adhered to. This information is provided in an excel file in the repository