The Research on the FDD-LTE System and its Key Technologies

2013 ◽  
Vol 278-280 ◽  
pp. 1937-1940
Author(s):  
Cai Xia Yu ◽  
Man Zhang ◽  
Xiao Bo Yang
Keyword(s):  
Relative Frequency ◽  
Random Access ◽  
Frequency Offset ◽  
Cyclic Shift ◽  
Basic Principles ◽  
Sequence Design ◽  
Advantages And Disadvantages ◽  
Key Technologies

The paper elaborates OFDM technology and its advantages and disadvantages, analyzes the basic principles on random access preamble sequence design ,and defines and analyzes Zadoff sequences and its excellent characteristics . After that, the paper analyzes the frequency offset exists and ZC sequence cyclic shift for the reasons for the decline of the autocorrelation peak of Zero, as a relative frequency offset .Finally,the paper proposes and emphasizes on the design of random access preamble sequence.

Comparative Assessment of Optical Techniques for Semi-Invasive SRAM Data Read-out on an MSP430 Microcontroller

2018 ◽  
Author(s):  
Tuba Kiyan ◽  
Heiko Lohrke ◽  
Christian Boit
Keyword(s):  
Supply Voltage ◽  
Photon Emission ◽  
Random Access ◽  
Integration Time ◽  
Security Evaluation ◽  
Testing And Debugging ◽  
Advantages And Disadvantages ◽  
The Core ◽  
Voltage Signal ◽  
Chip Testing

Abstract This paper compares the three major semi-invasive optical approaches, Photon Emission (PE), Thermal Laser Stimulation (TLS) and Electro-Optical Frequency Mapping (EOFM) for contactless static random access memory (SRAM) content read-out on a commercial microcontroller. Advantages and disadvantages of these techniques are evaluated by applying those techniques on a 1 KB SRAM in an MSP430 microcontroller. It is demonstrated that successful read out depends strongly on the core voltage parameters for each technique. For PE, better SNR and shorter integration time are to be achieved by using the highest nominal core voltage. In TLS measurements, the core voltage needs to be externally applied via a current amplifier with a bias voltage slightly above nominal. EOFM can use nominal core voltages again; however, a modulation needs to be applied. The amplitude of the modulated supply voltage signal has a strong effect on the quality of the signal. Semi-invasive read out of the memory content is necessary in order to remotely understand the organization of memory, which finds applications in hardware and software security evaluation, reverse engineering, defect localization, failure analysis, chip testing and debugging.

The Basic Principles of Competitive Strategy

2015 ◽  
pp. 693-718
Author(s):  
Nabyla Daidj
Keyword(s):  
Strategic Planning ◽  
Competitive Advantage ◽  
External Environment ◽  
Strategic Thinking ◽  
Strategic Analysis ◽  
Sustainable Competitive Advantage ◽  
Complex Dynamic ◽  
Strategic Positioning ◽  
Basic Principles ◽  
Advantages And Disadvantages

Firms operate in a more and more complex, dynamic, less predictable environment. This situation requires following different approaches of strategic positioning and strategic planning and developing new patterns of strategic thinking. There are several strategic models and tools. Most of them have advantages and disadvantages. In spite of these limitations, these models must be examined. The purpose of this chapter is to conduct a strategic analysis (external and internal diagnoses). It familiarizes the reader with the forces that shape competition in a company's external environment and then analyzes internal strategic capabilities for identifying strategic sustainable competitive advantage.

scholarly journals Advantages and disadvantages of distance learning on students’ and teachers’ of the physical culture faculty opinion

2020 ◽  
Vol 26 ◽  
pp. 00058
Author(s):  
Alexey Korolkov ◽  
Gennady Germanov ◽  
Olga Langueva ◽  
Arina Shevyakova ◽  
Natalia Poskrebysheva
Keyword(s):  
Distance Education ◽  
Distance Learning ◽  
Relative Frequency ◽  
The Internet ◽  
Physical Culture ◽  
Advantages And Disadvantages ◽  
Electronic Catalogs ◽  
Validity Indicators

We tryed to formalize various aspects of distance education in the form of speculative validity indicators based on calculating the relative frequency of students and teachers opinions. Methods of survey, questioning, systematization of information from open sources in electronic catalogs and publications on the Internet were used. The systematized nominal information was classified according to the selected dichotomous bases. There are 10 reasons (factors) for evaluating the advantages and disadvantages of distance learning. 26 aspects-variables of distance education were identified. Promising areas for further research are outlined.

Analysis of methods to eliminate soil contamination with rocket fuel

2018 ◽  
Vol 22 (8) ◽  
pp. 55-59 ◽  
Author(s):  
E.M. Messineva ◽  
A.G. Fetisov ◽  
N.B. Manuilova
Keyword(s):  
Soil Contamination ◽  
Soil Reclamation ◽  
Space Technology ◽  
Rocket Fuel ◽  
Basic Principles ◽  
Advantages And Disadvantages ◽  
Biological Methods ◽  
Sources Of Contamination

The sources of contamination with heptyl (asymmetric dimethylhydrazine (NDMG)) associated with the operation of rocket and space technology have been identified and analyzed. Existing chemical, thermal, adsorption and biological methods for cleaning soil soils from pollution of NDMG are examined in detail and their basic principles are analyzed. In the process of work, the advantages and disadvantages of all the methods considered, as well as the features of their application, are revealed. The basic principles of choosing the most suitable methods in each particular situation are proposed. In general, a reasonable combination of all existing methods is recommended at different stages of soil reclamation.

Civil Unmanned Aircraft System Maintenance Structure

2013 ◽  
Vol 734-737 ◽  
pp. 2742-2745
Author(s):  
Lin Lin Wang ◽  
Zhi Wen Wu
Keyword(s):  
Unmanned Aircraft ◽  
Aircraft Maintenance ◽  
Unmanned Aircraft System ◽  
Advantages And Disadvantages ◽  
Investigation Result ◽  
Key Technologies ◽  
System Maintenance ◽  
Aircraft System

Three maintenance structures of avionics were investigated in the article, including centralized intermediated repair concept, three-level maintenance structure, and the two-level maintenance structure. Both the advantages and disadvantages of these three maintenance structures were fully discussed, especially the potential in civil UAS maintenance. The investigation result shows that the two-level maintenance structure is the best choice for the civil unmanned aircraft maintenance at present. Key technologies of the two-level maintenance structure used for civil UAS were also discussed in this article. The advisements were given in these discussions.

scholarly journals Frequency Offset Estimation and Training Sequence Design for MIMO OFDM

2008 ◽  
Vol 7 (4) ◽  
pp. 1244-1254 ◽  
Author(s):  
Yanxiang Jiang ◽  
Hlaing Minn ◽  
Xiqi Gao ◽  
Xiaohu You ◽  
Yinghui Li
Keyword(s):  
Frequency Offset ◽  
Training Sequence ◽  
Frequency Offset Estimation ◽  
Sequence Design ◽  
Training Sequence Design ◽  
Mimo Ofdm ◽  
And Training

scholarly journals Cold-formed Steel Framing of a Dairy Products Warehouse in Brest, Belarus

2021 ◽  
Vol 350 ◽  
pp. 00014
Author(s):  
Vasili Stsepaniuk ◽  
Andrei Shuryn ◽  
Dmitry Zhdanov ◽  
Pavel Tsikhanchuk
Keyword(s):  
Structural Design ◽  
Dairy Products ◽  
Structural Features ◽  
Basic Principles ◽  
Framed Structures ◽  
Analysis And Design ◽  
Advantages And Disadvantages ◽  
Steel Framing ◽  
Cold Formed Steel

The main advantages and disadvantages of cold-formed steel framed structures are discussed, and the basic principles for their analysis and design are considered. Some specific structural features of the thinwalled cold-formed steel framing of a dairy warehouse designed by Proektnauka LLC (Brest, RB), are described, and several recommendations so as to improve its structural design are given.

scholarly journals OPTICAL BIOMETRY OF THE EYE: THE PRINCIPLE AND THE DIAGNOSTIC POTENTIAL OF THE METHOD

2017 ◽  
Vol 12 (1) ◽  
pp. 35-42
Author(s):  
T. N Kiseleva ◽  
O. G Oganesyan ◽  
L. I Romanova ◽  
S. V Milash ◽  
A. V Penkina
Keyword(s):  
Comparative Analysis ◽  
Anterior Chamber ◽  
Axial Length ◽  
Anterior Chamber Depth ◽  
Laser Interferometry ◽  
Basic Principles ◽  
Optical Biometry ◽  
Advantages And Disadvantages ◽  
Diagnostic Potential ◽  
Corneal Diameter

Optical biometry is based on the laser interferometry technique for the measurement of the biometric characteristics of the eyes, such as the antero-posterior axial length, anterior chamber depth, lens and retina thickness, corneal diameter and parameters of keratometry. The present article was designed to overview the basic principles of this method, its advantages and disadvantages, indications and contraindications for its application. The comparative analysis of the characteristics of the following optical biometric devices was undertaken: IOL-Master 500, Lenstar LS 900, Aladdin, OA-1000, OA-2000, Al-3000, Al-Scan, Galilei G6, IOL-Master 700.

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