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Schemas01:42

Schemas

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A schema is a mental construct consisting of a cluster or collection of related concepts (Bartlett, 1932). There are many different types of schemata, and they all have one thing in common: schemata are a method of organizing information that allows the brain to work more efficiently. When a schema is activated, the brain makes immediate assumptions about the person or object being observed.
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Aromatic compounds can be identified or analyzed using proton NMR and carbon‐13 NMR. Typically, aromatic hydrogens or hydrogens directly bonded to the aromatic rings are strongly deshielded by the aromatic ring current. Therefore, they absorb in the range of 6.5–8.0 ppm in proton NMR spectra. For instance, aromatic hydrogens directly bonded to the benzene ring absorb at 7.3 ppm. However, aromatic hydrogens of larger rings absorb farther upfield or downfield than the ideal range.
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While Mendel’s Law of Segregation states that the two alleles for one gene are separated into different gametes, a different question of how different genes are inherited remains. For example, is the gene for tall plants inherited with the gene for green peas? Mendel asked this question by experimenting with a dihybrid cross; a cross in which both parents are homozygous for two distinct traits resulting in an F1 generation that are heterozygous for both traits.
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NMR Spectrometers: Overview01:20

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NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...
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Nuclear magnetic resonance (NMR) is a phenomenon exhibited by certain nuclei that can absorb characteristic radio frequency radiation under certain conditions. NMR has been extensively applied in molecular spectroscopy and medical diagnostic imaging. In both these applications, the molecule or subject under study is placed in a magnetic field and irradiated with radio frequency energy.
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NMR Spectroscopy of Benzene Derivatives01:34

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Simple unsubstituted benzene has six aromatic protons, all chemically equivalent. Therefore, benzene exhibits only a singlet peak at δ 7.3 ppm in the 1H NMR spectrum. The observed shift is far downfield because the aromatic ring current strongly deshields the protons. Any substitution on the benzene ring makes the aromatic protons nonequivalent, and the protons split each other. The peak is, therefore, no longer a singlet and the splitting pattern and their associated coupling...
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Executing Complexity-Increasing Queries in Relational MySQL and NoSQL MongoDB and EXist Size-Growing ISO/EN 13606 Standardized EHR Databases
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Enabling Attribute-based Access Control in NoSQL Databases.

Eeshan Gupta1, Shamik Sural1, Jaideep Vaidya2

  • 1Department of Computer Science and Engineering, Indian Institute of Technology, Kharagpur, India.

IEEE Transactions on Emerging Topics in Computing
|June 5, 2023
PubMed
Summary
This summary is machine-generated.

Attribute-based Access Control (ABAC) enhances NoSQL database security by enabling flexible policy enforcement for unstructured data. This approach addresses nascent data protection measures in NoSQL systems like MongoDB, improving security and privacy.

Keywords:
Attribute-based Access ControlMongoDBNoSQL datastores

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Area of Science:

  • Computer Science
  • Database Systems
  • Information Security

Background:

  • NoSQL databases are crucial for managing large unstructured datasets but lack robust access control.
  • Existing data protection measures in NoSQL are underdeveloped, posing security and privacy risks.
  • Attribute-based Access Control (ABAC) offers a flexible solution for dynamic access management.

Purpose of the Study:

  • To propose a novel methodology for implementing Attribute-based Access Control (ABAC) in NoSQL databases.
  • To specifically address ABAC implementation challenges in MongoDB, a widely used NoSQL database.
  • To enhance data protection and mitigate security vulnerabilities in NoSQL environments.

Main Methods:

  • Developed a methodology for specifying and enforcing ABAC policies in MongoDB.
  • Utilized the MongoDB Wire Protocol for request data extraction and processing.
  • Incorporated dynamic access decisions using environmental attributes and digitally signed user attributes for ad-hoc requests.

Main Results:

  • Demonstrated the scalability of the proposed ABAC approach through extensive experiments on real and synthetic datasets.
  • Successfully implemented and tested the ABAC methodology within a MongoDB environment.
  • Provided a publicly available GitHub repository for practical deployment.

Conclusions:

  • The proposed ABAC methodology effectively enhances security and privacy for NoSQL databases, specifically MongoDB.
  • The approach supports flexible policy specification, dynamic decision-making, and secure handling of ad-hoc requests.
  • The implementation's scalability and public availability facilitate broader adoption of robust access control in NoSQL systems.