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The power supply of the surgical luminaires represents an important source of risk for the patient's safety. The performance indicator for this system is availability. Considering the dedicated standards, there has been proposed a structure for the power supply system of a H-Surgical LED luminaire for which it is evaluated the availability, respectively the unavailability. It's presented a method...
The paper describes a new methodology that allows to design scalable complex control and data acquisition systems taking into consideration the additional, non-functional requirements of High-Energy Physics (HEP). Electronic systems applied in HEP often operate in difficult conditions. Access to such devices is difficult or even impossible. The HEP systems require high availability, serviceability...
Processes constrain developer freedom and impact software development cost. They can increase costs from only a few cents to almost 1000 USD per line of code. But they can also benefit the maintainability, dependability and safety of critical software. If failure risk costs are high, then the application of more expensive processes can actually reduce costs. Therefore it is important to understand...
There are a variety of ways to ensure the security of data in the cloud depending on the set of anticipated concerns. Many cloud storage secure data either by encrypting data on transfer, or by encrypting data at rest. These security protections seem very different, and currently there are no common goalbased security components for comparing them. In this paper we investigate the security components...
The early theoretical studies that presented conceptual definitions for the mapping of Quality of Experience (QoE) through Quality of Service (QoS), in an approach focused on Distributed Databases (DDBs), showed the directions to be threshed in a way to accomplish a hybrid DDBs' QoE-QoS set of evaluation criteria. That evaluation set being classified explicitly as partial, since QoE is a known multidimensional...
Cloud storage is becoming an option for users in keeping their data online, but it comes with the security threats and challenges of protecting their data from threats. Many security frameworks have been suggested by existing studies, governing bodies, industry standards etc. as guidelines to be implemented by cloud service providers (CSPs) but the complete set of controls cannot be fully implemented...
Sustainable computer networking approaches adapt network node power states dynamically in response to traffic demand. This scenario imposes new challenges to the way the network resilience is evaluated based on reliability and availability metrics. The traditional assessments of reliability and availability based on Markov models or the Cut-Set and Tie-Set techniques are based on static values and...
This paper compares the major concepts in ventilation requirements contained in API RP 500/505 and IEC 60079-10, specific to indoor, lighter than air, natural gas hazardous atmospheres. Engineering professionals rely on API 505 as the basis for area classifications. Previously, IEC and North American standards have been successfully adopted in the body of API 500/505 (79-10 Mod). However, the informative...
The National Electrical Code (NEC) has a new section that was added in 2008; Article 708 Critical Operations Power Systems (COPS). Though the NEC applies only to the United States, the methodology of evaluating risk and performing reliability analysis applies to any type of critical facility. This article will provide an overview of the requirements listed in Article 708 and present some existing...
IEEE P1900.4 is an emerging standard for optimized radio resource utilization where cognitive radio technologies are used for efficient spectrum utilization. In this paper, we design and implement a cognitive wireless network system based on open documents of IEEE P1900.4, and evaluate its performance using UDP streaming and HTTP download. Our experiments show interesting results that total network...
This is an introduction to the proceedings of the MWS 2007 workshop held at EDOC 2007. It first explains the motivation for and background of the workshop. Then, it contains a short description of the keynote, each long and short peer-reviewed paper, and the discussion session "impact of various execution environments on middleware for web services". After the closing statements, MWS 2007...
We developed a quality of service (QoS) management system to support service level management (SLM) for global enterprise services. The QoS management system is integrated with one of our enterprise services in a preproduction system, an identical system as the production system but in a test environment. Lab experiments showed that our integrated solution helps global enterprise services to better...
In this paper we discuss the use cases for monitoring of Web services for compliance with policies and service level agreements. In particular, the quality of service associated with Web service interactions and its monitoring rely on the proper use by both parties of related Web service protocols. This monitoring is best served by an event-centric model and an extensible scripting language, such...
Modern telecommunication systems like mobile phones, internet access nodes or servers demand high reliability, availability and flexibility at low maintenance costs of the supplying electrical power systems. Typically, these systems are fed by DC-bus voltages (27 V, 48 V, 60 V), where DC/DC converters accommodate low voltages (5 V, 3.3 V, 1.1 V...) for modern p-Controllers and DSPs. On the other hand,...
Reliability, availability, and maintainability (RAM) specifications that were issued for thyristor-based high-voltage DC (HVDC) converter stations in service in North America are summarized. Twenty project specifications are summarized. A detailed summary by project is shown with specific quantitative requirements categorized. Definitions of terms, representative design principles, and formulae used...
Alternate approaches to applying a digital control system, for both new construction and existing plant modernization projects, are described, and their advantages and disadvantages are compared. Criteria to be used to judge the suitability of commercially available systems for use in the power generation industry are provided. Terminology is defined, and the objectives of distributed control and...
The standard is intended to aid the electric power industry in reporting and evaluating electric generating unit reliability, availability and productivity. It standardises terminology and indexes for reporting these performance measures. The standard was developed to overcome present difficulties in the interpretation of electric generator performance data and to facilitate comparisons between different...
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