Technical Diagnosis Research Articles

The Analytical Model of Technical Diagnosis of Telecommunication Network Devices with Preliminary Clustering of the Attribute Space

The Analytical Model of Technical Diagnosis of Telecommunication Network Devices with Preliminary Clustering of the Attribute Space

Method for segregation of suspected logical malfunctions in combinatorial discrete devices

Consideration was given to the direct problem of technical diagnosis which lies in determining the technical state of a combinatorial discrete device from the results of testing. The graph and analytical models of behavior of the combinatorial discrete device allowing for the technical state of its elements were presented. A method of segregation of the suspected logical malfunctions under which observable behavior of the combinatorial discrete device is possible was proposed.

Conflicting Uses in Mangueira Bay: A Prospective Analysis

Developing countries in the technological transition period seek fast economic growth and give environmental issues lower priority. This is one of the causes of environmental degradation in coastal zones. The Patos Lagoon Estuary, located along the southern coast of Brazil, has accumulated environmental liabilities over the last 30 years due to socioeconomic activities in the city of Rio Grande. These liabilities are particularly conspicuous in the shallow estuarine embayments, which are considered vital habitats due to their high productivity and significance as nurseries (shelter and feeding) for the local biota. Since the 1970s, these habitats have suffered various stressors from uncontrolled urban and industrial expansion, which are responsible for landfills at the estuary shores and the enrichment of the water with nutrients and metals from the disposal of effluents. In the medium to long term, these problems tend to be aggravated by existing projects and policies of industrial and port expansion. One of the most productive environments in this estuary is Mangueira Bay, an oval semi-enclosed bay located south of the city with an area of 23 km2 and a depth mostly below 1.5 m. This embayment is currently a focus of land/water use conflicts involving several social actors, including fishermen, socially excluded people, high-class housing users, public institutions, industries and the general population. In this context, finding a solution that is appropriate and compatible with all social demands on the environmental goods and services provided by the estuary is a difficult task. The process must begin with a technical diagnosis that is extensive and detailed enough to include social, economic and environmental issues. This paper describes the use conflicts of Mangueira Bay and suggests guidelines for a collective management plan.

Forced nonlinear vibration of shallow shell and application to technical diagnosis

This paper presents direct and inverse problems of forced nonlinear vibration of shallow shell. From that the method of establishment and solution of technical diagnosis for shallow shell under the vibrated load is proposed. The diagnosis criterion is the minimum of the difference between the square of experimental and theoretical data. The diagnosed parameters are the external loads and the reactions arose at the boundaries.

Identification and prioritization of performancelimiting factors for water treatment plantoptimization in Korea

Performance limiting factors (PLFs) derived from 161 drinking water treatment plants (DWTPs), assessed by the International Technical Diagnosis and Assistance Center, were analyzed and evaluated in this study. In order to conduct research, 161 DWTPs were divided into five categories depending on their capacity, and into twelve groups according to processes and facilities. From the results of analysis, PLFs and their distribution ratio derived from each category were significantly different. Filtration was the most important performance limiting factor in all DWTPs of five categories, and PLFs in filtration were backwashing velocity, media configuration, bed depth, and formation of mud-ball. The PLFs in coagulation–flocculation process were found to be coagulant dose, mixing intensity, mechanical problems, and others in the order of frequency of occurrence. Also, insufficient disinfection ability, is resulting from insufficient hydraulic detention time, improper chlorine dose and injection point, is the most significant among PLFs in a clear well. In the case of sedimentation, inappropriate baffle structure and excessive upward velocity were PLFs. In addition, the results showed that high turbid water and low alkalinity in rainy season, ferric and manganese ions, and ammonia nitrogen have contributed significantly to the performance of DWTPs.

Analysis of Models for Monitoring of the Technical State and Diagnosis of Electronics and Computer Technologies

Analysis of Models for Monitoring of the Technical State and Diagnosis of Electronics and Computer Technologies

A shared workspace to support man?machine reasoning: application to cooperative distant diagnosis

This paper focuses on man---machine cooperation problems. In particular, it deals with those problems that occur when both human and machine have to achieve a shared reasoning activity. It puts forward a man---machine approach that is dedicated to technical diagnosis problem solving. Coordination of human and automated reasoning is key to solving this problem, since efficiency depends on both sharing and interpreting exchanged data. A shared workspace is proposed to support both machines and their human operators. This workspace is kept as close as possible to human representations in order to reduce cooperation costs. The paper describes those coordination mechanisms that are able to support such a cooperative activity using a shared workspace. In order to assess the costs and benefits of such cooperation, these mechanisms are applied to a complex industrial problem: diagnosis and troubleshooting in a phone network. The results show the full impact of cooperation on human---machine reasoning.

More on (2,2)-separating systems

The theory of separating systems has been applied in different areas of science and technology such as automata synthesis, technical diagnosis, and authenticating ownership claims. Constructions of (2,2)-separating systems derived from error-correcting codes are given, together with bounds on their parameters based on distance considerations.

Performance Improvement of Technical Diagnosis Provided by Human-Machine Cooperation

The paper proposes a human-machine approach dedicated to the technical diagnosis. Both human and machine reasoning introduce a coordination problem when a shared activity has to be achieved. The ability for sharing and interpreting data is the main condition to cooperate during diagnosis. We propose a shared workspace in order to support both human and machine reasoning activities. The proposed workspace is very close to human mental models in order to reduce mental workload. We define means to coordinate reasoning and mechanisms to share data. In order to evaluate costs and benefits of a cooperative diagnosis, we have applied our concepts to the diagnosis task of a real phone network. A decision support tool dedicated to phone network diagnosis has been developed and tested in real contexts with professional operators. The results presented in the paper show the impact of the cooperative work and the increase of performance of the humanmachine teams.

Technical Diagnosis of Process Equipment with Determination of Remaining Operating Life

The sulfur content in diesel fuels that satisfy current environmental requirements is 0.05–0.10 wt.% and the aromatic hydrocarbon content is 10–20 wt. % [1]. When cuts with an end point of tEP > 360°C are contained in the fuel, such quality indexes as the sulfur content, solid point, and cetane number become significantly worse.

Diagnostics of cable networks of aerodrome lighting signal systems

Worked and substantiated are diagnostics parameters and the algorithm of technical diagnosis of cable rings and the technique of taking decisions as to prolongation of cable rings service for a definite period depending on their real technical condition

The Design of Circuit for Checking Short in HT-7U Superconducting Tokamak device

The tokamak HT-7U project has been funded as a Chinese national project since 1998. The main object of the project is to build a nuclear fusion experimental device with divertor configuration, which is designed by the Institute of Plasma Physics, the Chinese Academy of Sciences (ASIPP). It is a full superconducting device, consisting of superconducting toroidal field (TF) coils and superconducting poloidal field (PF) coil. During the operation of the device, the operational parameter of device should be checked by technical diagnosis. This paper describes the design of circuit for checking short between every two parts of the HT-7U device. The main contents of design include circuit of data acquisition and data processing of computer.

Vibration Diagnosis and Maintenance of Machinery

One of the fundamental problems in refineries is increasing the reliability and safety of the process equipment. The experience of Ryazan' Oil Refinery OJSC shows: modern methods and agents for technical diagnosis of equipment ensures timely detection of defects, prevention of breakdowns, maintaining operating indexes within the assigned limits, and predicting the extent and types of repairs for the most complete possible utilization of interrepair life. The safe use of the equipment is facilitated and unplanned breakdowns are prevented as a result.

Technical diagnosis and determination of the remaining service life of compressor plants, vessels, apparatus, and industrial pipelines

Technical diagnosis and determination of the remaining service life of compressor plants, vessels, apparatus, and industrial pipelines

Case-based reasoning for medical decision support tasks: The Inreca approach

We describe an approach for developing knowledge-based medical decision support systems based on the new technology of case-based reasoning. This work is based on the results of the Inreca European project and preliminary results from the Inreca+ project which mainly deals with medical applications. One goal was to start from case-based reasoning technology for technical diagnosis and `scale-up' to more general non-technical decision support tasks as typically given in medical domains. Inreca technology has been used to build an initial decision support system at the Russian Toxicology Information and Advisory Center in Moscow for diagnosing poison cases caused by psychotropes.

Acoustic emission method of technical diagnosis of power plants

Acoustic emission method of technical diagnosis of power plants

Probabilistic Reliability Engineering

Fundamentals. Reliability Indexes. Unrepairable Systems. Load-Strength Reliability Models. Distributions with Monotone Intensity Functions. Repairable Systems. Repairable Duplicated Systems. Analysis of Performance Effectiveness. Two-Pole Networks. Optimal Redundancy. Optimal Technical Diagnosis. Additional Optimization Problems in Reliability Theory. Heuristic Methods in Reliability. Index.

Computer-aided diagnosis of magnetoelectric measurement systems

The paper presents some considerations about technical diagnosis of magnetoelectric measurement systems (indicating instruments or magnetoelectric transducers), based on an original “complete mathematical model” proposed by the authors, which includes the mechanical and electrical equations of dynamic behaviour. This mathematical model was solved by a Runge-Kutta method with Gill coefficients, adapted for solving nonlinear systems of equations by the iterations method. Finally, the authors present the influence of different defects on the dynamic behaviour of these measurement systems and propose some criteria for their technical diagnosis.

Statistische und neuronale Verfahren zum nicht überwachten Klassifikatorenentwurf in der Motorendiagnose

Article Statistische und neuronale Verfahren zum nicht überwachten Klassifikatorenentwurf in der Motorendiagnose was published on January 1, 1995 in the journal at - Automatisierungstechnik (volume 43, issue 1).

Condition-Based Maintenance of Electrical Power Installations

Efforts to introduce a rational condition - based maintenance programme started as early as almost two decades ago. This paper intends to show the impostance of this developement for technical energetics. Taking the effects of damaging processes and the resulting maintenance measures as a starting point, the possibilities as well as the impostance of technical diagnosis for condition-based maintenance will be shown. The paper concludes with a short survey of how condition-based maintenance can be utilized effectively.