Development of a steady-state thermodynamic model in Microsoft Excel for performance analysis of industrial gas turbines

In this paper, an off-design performance prediction model for a single shaft industrial gas turbine (IGT) using Microsoft Excel with Visual Basic for Applications (VBA) programming is presented. The modelling architecture is comprised of fundamental thermodynamic equations describing the performance of IGTs. A graphical user interface has been constructed to allow an easy interaction of the model to predict IGT performance at different operating conditions. Component characteristic maps for the compressor and turbine with a bilinear interpolation method have been implemented in the Excel modelling architecture. A commercial thermodynamic toolbox (Thermolib, EUtech Scientific Engineering GmbH) which is compatible with Simulink environment has been considered to validate Excel model of the IGT system. This Excel modelling architecture could be a valuable reference tool for engineers and students to understand IGT performance at different ambient and operating conditions

Process of designing robust, dependable, safe and secure software for medical devices: Point of care testing device as a case study

This article has been made available through the Brunel Open Access Publishing Fund.Copyright © 2013 Sivanesan Tulasidas et al. This paper presents a holistic methodology for the design of medical device software, which encompasses of a new way of eliciting requirements, system design process, security design guideline, cloud architecture design, combinatorial testing process and agile project management. The paper uses point of care diagnostics as a case study where the software and hardware must be robust, reliable to provide accurate diagnosis of diseases. As software and software intensive systems are becoming increasingly complex, the impact of failures can lead to significant property damage, or damage to the environment. Within the medical diagnostic device software domain such failures can result in misdiagnosis leading to clinical complications and in some cases death. Software faults can arise due to the interaction among the software, the hardware, third party software and the operating environment. Unanticipated environmental changes and latent coding errors lead to operation faults despite of the fact that usually a significant effort has been expended in the design, verification and validation of the software system. It is becoming increasingly more apparent that one needs to adopt different approaches, which will guarantee that a complex software system meets all safety, security, and reliability requirements, in addition to complying with standards such as IEC 62304. There are many initiatives taken to develop safety and security critical systems, at different development phases and in different contexts, ranging from infrastructure design to device design. Different approaches are implemented to design error free software for safety critical systems. By adopting the strategies and processes presented in this paper one can overcome the challenges in developing error free software for medical devices (or safety critical systems).Brunel Open Access Publishing Fund

CoS: a new perspective of operating systems design for the cyber-physical world

Our day-to-day life is dependent on several embedded devices, and in the near future, many more objects will have computation and communication capabilities enabling an Internet of Things. Correspondingly, with an increase in the interaction of these devices around us, developing novel applications is set to become challenging with current software infrastructures. In this paper, we argue that a new paradigm for operating systems needs to be conceptualized to provide aconducive base for application development on Cyber-physical systems. We demonstrate its need and importance using a few use-case scenarios and provide the design principles behind, and an architecture of a co-operating system or CoS that can serve as an example of this new paradigm

Network Forensic Based on Honeynet

Abstract: In this paper we design a Honeynet Network Architecture which combines the both Low and High interaction Honeypots. In this architecture, low interaction honeypot play the role of a gateway to high interaction honeypot and filter out incoming traffic. This permitted us to provide comprehensive statistics about threats, collect high level information about attacks, and monitor the activities carried out by different kind attackers, capture network traffic and storing on our base operating system for further forensic

TROPIX Power System Architecture

This document contains results obtained in the process of performing a power system definition study of the TROPIX power management and distribution system (PMAD). Requirements derived from the PMADs interaction with other spacecraft systems are discussed first. Since the design is dependent on the performance of the photovoltaics, there is a comprehensive discussion of the appropriate models for cells and arrays. A trade study of the array operating voltage and its effect on array bus mass is also presented. A system architecture is developed which makes use of a combination of high efficiency switching power convertors and analog regulators. Mass and volume estimates are presented for all subsystems

Developing a Message Interface Architecture for Android Operating Systems

User Interface is an essential part of the field of Human–computer interaction (HCI). It’s involves the study, planning, design and uses of the interaction between people (users) and computers or machines. In modern human lifethis is essential such as mobile devices. We usually contact peoples via mobile devices, in such a way phone call and message passing, and this is very easiest way to contact with others. The intention of this paper is to provide an overview, analysis and proposed an idea of easy and light of message interface architecture for android operating system, which is most useable mobile operating systems in world. In generally we can contact with people through the message passing- on specific group messages or specific peoples. The overview include the basic definitions, a survey of traditional existing technologies of message interface architecture used in android devices, and finally the proposed idea and architecture of message interface for android devices. This paper also offers a comprehensive number of references for each concept, method, and application fields of interface design of HCI

Minimal operating system implementation

The following thesis describes an implementation of a minimal operating system which supports user interaction through keyboard and a terminal window. The system design is inspired by GNU/Linux operating system and is at its core monolithic kernel with support for memory management, kernel modules and various peripheral drivers, like serial ports, VGA terminal, timers and interrupts. The second part of the system is the user mode using a REPL terminal with some inbuilt tools for basic computer tasks and demonstration on system capabilities. The operating system uses C programming language, as well as x86 architecture assembly for some critical parts. Bochs, the virtual machine software was used to emulate hardware while in development, however, the system can be booted on compatible physical hardware

Minimal operating system implementation

The following thesis describes an implementation of a minimal operating system which supports user interaction through keyboard and a terminal window. The system design is inspired by GNU/Linux operating system and is at its core monolithic kernel with support for memory management, kernel modules and various peripheral drivers, like serial ports, VGA terminal, timers and interrupts. The second part of the system is the user mode using a REPL terminal with some inbuilt tools for basic computer tasks and demonstration on system capabilities. The operating system uses C programming language, as well as x86 architecture assembly for some critical parts. Bochs, the virtual machine software was used to emulate hardware while in development, however, the system can be booted on compatible physical hardware

Design and Implementation of Campus Competition Information Sharing Platform Based on Android

At present, the market share of the Android system in the smartphone operating system has reached 90%. In view of the limitations of the existing sharing platform for campus competition information, a campus APP, which integrates competition and activity information release, information sharing and interrogative interaction, is put forward. In this paper, the overall architecture design, function module design, database design and RESTful API design are carried out. The Java language and MVP pattern are used by Android part. Python language, RESTful architecture and ORM technology are used at the backend to realize the information of publishing competition information, the list of competition information, the information of search competition and the management of competition information. The platform is running on the North Campus of Guizhou University, the current operation situation is well

RF Transceiver system design for IoT in wide area networks

Abstract. Wireless communication has grown rapidly in the last two decades. New applications and advancement in technology is boosting the demand. Internet of things (IoT) is nowadays topic of discussion for everyone related to the wireless communication industry. IoT is a system of interconnected devices which can be people, animals, things or machines each with a unique identifier and the ability to transfer data over a network without any interaction with humans or computers. The aim of this thesis is system design of RF transceiver for IoT devices operating in wide area networks. Several service providers are struggling to capture the IoT market. In this thesis detailed system design of third generation partnership project (3GPP) newly specified user equipment category M1 also known as long term evolution machine (LTE-M) is presented. LTE-M can operate in both full duplex and half duplex and it uses the same signal structure as the current operational standard long term evolution (LTE). The designed transceiver is able to operate in half duplex and meet the performance requirement (95 % throughput) specified by 3GPP. Radio frequency transceivers have various architectures and each architecture has its own pros and cons associated with it. This transceiver is designed to be integrated in a wearable device. Constraints like small size and low power restrictions led to the choice of direct conversion architecture for the design. Simulations were performed in ADS to verify the theoretical results