Safe, Fault Tolerant and Capture-Resilient Environmental Parameters Survey Using WSNs

2009 ◽  
pp. 180-189 ◽  
Author(s):  
Gianni Fenu ◽  
Gary Steri
Keyword(s):  
Fault Tolerant ◽  
Environmental Parameters

Research on Data Fusion Technology in WSN

2011 ◽  
Vol 148-149 ◽  
pp. 75-81
Author(s):  
Wen Chao Zhang ◽  
Yu Zhen Liu
Keyword(s):  
Wireless Sensor Networks ◽  
Sensor Networks ◽  
Data Fusion ◽  
Information Acquisition ◽  
Evaluation Method ◽  
Fault Tolerant ◽  
Environmental Parameters ◽  
Wireless Sensor ◽  
Fusion Algorithm ◽  
And Performance

Wireless Sensor Networks is a novel technology of information acquisition and processing. It integrates the technologies of sensor, wireless communication, and microelectronics. It can sense and collect environmental parameters in the range of the network, and then process the parameters cooperatively in real time. We discuss the design principle and performance evaluation method of the data fusion algorithm for wireless sensor networks in detail. We introduce the concept of fusion cost, and emphasize that the data fusion algorithm in wireless sensor networks must be combined with specific application background. Finally, we emphasize the proposed algorithm which combined reduced-rank filtering with adaptive weighted. The fact that it can effectively eliminate the effect of abnormal noise on fusion performance is illustrated through examples. The results showed that this algorithm occupies obviously the advantage in the aspect of fault-tolerant ability.

scholarly journals МЕТОДОЛОГІЯ ЗАБЕЗПЕЧЕННЯ ГАРАНТОЗДАТНОСТІ ІНФОРМАЦІЙНО-КЕРУЮЧИХ СИСТЕМ З ВИКОРИСТАННЯМ БАГАТОЦІЛЬОВИХ СТРАТЕГІЙ ОБСЛУГОВУВАННЯ

2020 ◽  
pp. 43-58
Author(s):  
Юрій Леонідович Поночовний ◽  
Вячеслав Сергійович Харченко
Keyword(s):  
Life Cycle ◽  
Control Systems ◽  
System Analysis ◽  
Fault Tolerant ◽  
Environmental Parameters ◽  
System Level ◽  
Maintenance Strategies ◽  
Different Types ◽  
Viable System ◽  
And Control

The article considers the methodology of ensuring the dependability of information and control systems using multi-purpose maintenance strategies. The relevance of research is due to the need to ensure the functioning of dependable information and control systems in the face of changes in requirements, environmental parameters, and the manifestation of unspecified failures of their components. The methodology is presented at the system level as a combination of the concept of multi-purpose maintenance, as well as the principles of taking into account changes in the information and control system and environment during the life cycle; comprehensive consideration of different types of failures, and the effects of change; multi-purpose maintenance and combines a set of new models and methods for determining the parameters of dependability information and control systems and the choice of parameters for their maintenance procedures. The proposed concept of multi-purpose maintenance is obtained by developing the Fon-Neumann paradigm and is formulated as a concept of building reliable and secure systems from insufficiently dependable components and multi-purpose maintenance on combined strategies in changing conditions and environment. The scope of the proposed concept is applicable in cases where the principles of von-Neumann do not allow building a viable system due to economic, temporal, or other reasons. In this case, the use of principles, methods, and models that are conceptual, extends to information and control systems built using maintained components and system multi-purpose service strategies. The proposed principle of taking into account changes involves the expansion of the classical control circuit of the fault-tolerant system, which response to the fault occurrence as errors and failures. The principle of comprehensive consideration of different types of failures and the effects of change is a continuation of the principles of unity and connection during the procedures of system analysis. It is also a logical continuation of the facet arrangement of fault types and chains of causal relationships from faults and defects to faults, failures, and errors. Within the framework of the proposed methodology, multi-purpose maintenance strategies, a set of options for goals, types, processes, properties, and parameters of information and control systems have been developed, which reduces model uncertainty and justifies practical measures to ensure dependability at different stages of the life cycle.

HUBUNGAN KEPADATAN BIVALVIA DENGAN PARAMETER LINGKUNGAN DI PESISIR TANJUNG PURA KABUPATEN BANGKA TENGAH

2020 ◽  
Vol 13 (2) ◽  
pp. 112-121
Author(s):  
Sudiyar . ◽  
Okto Supratman ◽  
Indra Ambalika Syari
Keyword(s):  
Negative Impact ◽  
Principal Component ◽  
Environmental Parameters ◽  
Data Retrieval ◽  
Distribution Patterns ◽  
Random System ◽  
System Method ◽  
Relationship Of ◽  
The Relationship ◽  
Anadara Granosa

The destructive fishing feared will give a negative impact on the survival of this organism. This study aims to analyze the density of bivalves, distribution patterns, and to analyze the relationship of bivalves with environmental parameters in Tanjung Pura village. This research was conducted in March 2019. The systematic random system method was used for collecting data of bivalves. The collecting Data retrieval divided into five research stasions. The results obtained 6 types of bivalves from 3 families and the total is 115 individuals. The highest bivalve density is 4.56 ind / m², and the lowest bivalves are located at station 2,1.56 ind / m²,  The pattern of bivalve distribution in the Coastal of Tanjung Pura Village is grouping. The results of principal component analysis (PCA) showed that Anadara granosa species was positively correlated with TSS r = 0.890, Dosinia contusa, Anomalocardia squamosa, Mererix meretrix, Placamen isabellina, and Tellinella spengleri were positively correlated with currents r = 0.933.

Recirculation versus flow-through rainbow trout laboratory Flavobacterium columnare challenge

2020 ◽  
Vol 139 ◽  
pp. 213-221
Author(s):  
C Birkett ◽  
R Lipscomb ◽  
T Moreland ◽  
T Leeds ◽  
JP Evenhuis
Keyword(s):  
Rainbow Trout ◽  
Environmental Parameters ◽  
Cumulative Effects ◽  
Flavobacterium Columnare ◽  
Replacement Rate ◽  
Bacterial Concentration ◽  
Water Replacement ◽  
Dose Concentration ◽  
Flow Through ◽  
And Control

Flavobacterium columnare immersion challenges are affected by water-related environmental parameters and thus are difficult to reproduce. Whereas these challenges are typically conducted using flow-through systems, use of a recirculating challenge system to control environmental parameters may improve reproducibility. We compared mortality, bacterial concentration, and environmental parameters between flow-through and recirculating immersion challenge systems under laboratory conditions using 20 rainbow trout families. Despite identical dose concentration (1:75 dilution), duration of challenge, lot of fish, and temperature, average mortality in the recirculating system (42%) was lower (p < 0.01) compared to the flow-through system (77%), and there was low correlation (r = 0.24) of family mortality. Mean days to death (3.25 vs. 2.99 d) and aquaria-to-aquaria variation (9.6 vs. 10.4%) in the recirculating and flow-through systems, respectively, did not differ (p ≥ 0.30). Despite 10-fold lower water replacement rate in the recirculating (0.4 exchanges h-1) compared to flow-through system (4 exchanges h-1), differences in bacterial concentration between the 2 systems were modest (≤0.6 orders of magnitude) and inconsistent throughout the 21 d challenge. Compared to the flow-through system, dissolved oxygen during the 1 h exposure and pH were greater (p ≤ 0.02), and calcium and hardness were lower (p ≤ 0.03), in the recirculating system. Although this study was not designed to test effects of specific environmental parameters on mortality, it demonstrates that the cumulative effects of these parameters result in poor reproducibility. A recirculating immersion challenge model may be warranted to empirically identify and control environmental parameters affecting mortality and thus may serve as a more repeatable laboratory challenge model.

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