The modern process plant is characterised by the use of computers for process control. Increasing reliability and diminishing capital investment costs have encouraged the use of process computers as the principal control mechanism. Greater reliability has also led to an increase and change in the tasks assigned to the computer. The relatively rapid advances in process control have understandably resulted in a carry-over of traditional practices which are often inadequate in the present day environment. A notable example of such a practice is the alarm system which is neglected in the literature and is frequently the least satisfactory aspect of a control system.

In recent years, the fishery production has been drastically decreased in Taiwan, mainly due to overfishing and coast pollutions, therefore fishermen and corporation are encouraged by government to invest in ocean cage aquaculture. However the high price fishes in the net cage are often coveted, so the incidences of fish stealing and net cage breaking were found occasionally, which cause great economical loss. Security guards or visual monitoring system has limited effect especially in the night when these intrusions occur. This study is based on acoustic measure to build a net cage alarm system, which includes the sonobuoy and monitor station on land. The sonobuoy is a passive sonar that collects the sounds near the net cage and transmits the suspected signal to the monitor station. The signals were analyzed by the control program on the personal computer in the monitor station, and the alarms at different stages could be activated by the sound levels and durations of the analyzed signals.

Thesis (M.S.) -- Worcester Polytechnic Institute. / Keywords: speech intelligibility; voice alarm communication system; common intelligibility scale (CIS); speech transmission index (STI). Includes bibliographical references (p. 80-82).

An effective alarm system is a critical part of many different types of jobs. It is also important that the alarm signal can capture human attention and convey appropriate urgency. In the current study the effect of siren sounds with or without unexpected, deviant sounds represented by a change of speed (a temporal deviant) were tested to evaluate if such change could successfully capture attention. The results showed that distraction was more pronounced when the deviant within the sound was a change from fast to slow as compared with slow to fast. Therefore, an alarm signal using a temporal deviant – changing from fast to slow—can be effective in capturing human attention and might be factored into the design of alarm systems.

Master’s Thesis is consider to security system design. In this Theses is described methodology of proposal of electronic security alarm according to valid standards and rules. In terms of standard and specification is created way of computerization of this design. Consequently, this procedure is software implemented. Results of algorithmic design are reviewed on hypothetic object.

Bridge Navigational Watch Alarm System (BNWAS) blev implementerat i the International Convention for the Safety Of Life At Sea (SOLAS) år 2009. Sedan dess har olika typer av fartyg haft längre eller kortare tid på sig att installera systemet ombord. Navigatörer har utryckt både positiva och negativa synpunkter på systemet. Syftet med studien var att få en uppfattning om hur implementeringen av BNWAS har utvecklats praktiskt inom sjöfarten. För att undersöka detta har haverirapporter granskats innan samt efter implementeringen. Resultatet från detta har jämförts med tidigare implementeringar inom samma område. Data har sedan kvantitativt och kvalitativt analyserats. Resultaten tyder på att implementeringen av BNWAS har stött på samma problem som liknande implementeringar gjort tidigare. De slutsatser som dragits utifrån dessa resultat var att implementeringen av BNWAS kunde ha gjorts på ett bättre sätt om lärdomar från tidigare implementeringar tagits med i utvecklingen av implementeringen. Studien visade att grundstötningar har minskat i den undersökta haverikommissionens utredningar. / BNWAS was implemented in SOLAS, chapter V in 2009. Since that year, different types of ships have had different time schedules to install the system onboard. Navigational watch keepers have expressed both positive and negative attitudes towards the system and the operation of it. The purpose was to shed light upon how the implementetion of BNWAS has developed practically at the end users. The purpose of the study has been fulfilled through both qualitative and quantitative methods. Accident investigation reports both before and after the implementation were examined togheter with examinations and reviews of earlier studies regarding questions about implementation. This work was done to reach the goal of the study with a reliable result. These results implied that the implementation had encountered the same problems as earlier implementations (in the same area) had. They also showed that groundings of ships occured in the same way both before and after the implementation. The conclusions was that the implementation of BNWAS could have been developed more smoothly if the problems from earlier implementations had been accounted for. The groundings have however been reduced significantly since the implementation, whether it is due to the implementation or something else is still to be found out with a more comprehensive study.

Digital services involving large systems with multiple users are ubiquitous in modern society. The systems are often complicated and made up of multiple devices and communication protocols. A fundamental problem in this context is how the behavior of a system changes as the number of users vary. In particular, when do the systems’ resources saturate and how does the system behave when close to saturation. Performance testing is key for addressing this fundamental problem. Performance testing is the scope of this project. Performance tests can be used for inference of, for example, a system's scalability. Furthermore, it can be used to provide general guarantees on the services that can be delivered. Performance testing at the company Phoniro AB is considered. The platform Phoniro Care is the back-end service for the company’s products. The Phoiro 6000 system is one of the products that uses Phoniro Care. The system allows for multiple users and offers alarm services. The primary focus of this project is to determine the behavior of that system during varying levels of simulated load, and furthermore analyze the data extracted from such simulations and tests. The open source software JMeter was used as the tool for performance testing. It was selected from a set of candidate tools that have been evaluated in the literature based on various performance criteria. The results are presented by graphs showing the time evolution of different performance indicators. A conclusion from this work is that the implemented performance testing framework helps to answer questions about the systems’ behavior. Questions that are important for the company’s further development and expansion of the system. Furthermore, the proposed framework establishes a foundation for further inquiries on the subject.

This thesis investigates different aspects of implementing a Service-Oriented Architecture (SOA) for an alarm and crisis management system called Wearable Command Unit (WCU) developed by Saab Security Systems. The WCU system must be able to integrate easily with external systems in order to move into new markets and survive as a product. The focus of this report is a general solution for communicating alarm information from external systems to the WCU. A given requirement was that the solution must be based on SOA. Therefore, the concept of SOA is investigated and its applicability is considered for the WCU architecture. A design proposal based on a combination of open information and communication technologies was made to show how WCU may use SOA to receive alarm information from external systems. The design proposal was evaluated by a load test as well as comparing its conformance to SOA. The load test showed that the proposed solution can process incoming messages at a rate of 2 ms per message when client and server are run on the same machine. The result of the comparison showed that the WCU can, with small modifications, apply a SOA. While this thesis has only investigated the use of SOA in the context of alarm information, there is a clear trend toward integrating information for diverse systems to enable users to have better quality information. Providing first responders with the information that they need, when and where they need it can enable them to save lives, save property, and reduce the risk to the public of incidents. An important result from this thesis is the observation that a system that needs to integrate with many distinct systems can be better prepared if made SOA conformant. This requires the system to have an interface towards other systems based on platform independent protocols. Systems such as the WCU, which are based on Windows Communication Foundation (WCF), can easily add such an interface by configuring WCF in an appropriate way. / Detta examensarbete undersöker olika möjligheter att implementera Service-Oriented Architecture (SOA) för ett larm- och krishanteringssystem kallat Wearable Command Unit (WCU) utvecklat av Saab Security Systems. För att kunna nå nya marknader och utvecklas som produkt, är det viktigt att WCU-systemet på ett enkelt sätt kan integreras med externa system. Detta examensarbete fokuserar på att ta fram en generell lösning för att kommunicera larminformation från externa system till WCU. Ett förbestämt krav var att lösningen måste vara baserad på SOA. Begreppet SOA undersöks och dess tillämpningsbarhet för WCU undersöks. Ett designförslag baserat på en kombination av öppna informations- och kommunikationsteknologier gjordes för att visa hur WCU kan använda SOA för att ta emot larminformation från externa system. Designförslaget utvärderades genom ett belastningstest, samt genom att jämföra dess konformitet med SOA. Belastningstestet visade att designförslaget kan processa inkommande larm i en hastighet av 2 ms per meddelande när klienten och servern körs på samma maskin. Resultatet av jämförelsen visade att WCU kan, med små modifieringar, implementera en SOA. Detta examensarbete har endast undersökt användandet av SOA vad gäller larminformation, men det finns även en klar tendens mot att integrera annan information ifrån olika system för att på så sätt ge användare av systemet kvalitativ information. Genom att ge framskjutna enheter lämplig information, när och där de behöver det, kan de bli bättre förberedda på att rädda liv och egendom, och samtidigt minska olycksrisken för allmänheten. Ett viktigt resultat från detta examensarbete är iakttagelsen att ett system som behöver integreras med många andra olika system kan bli bättre förberett genom att göra det SOAbaserat. För att ett system ska vara SOA-baserat krävs att det har ett gränssnitt baserat på plattformsoberoende protokoll mot andra system. System som WCU, som är baserade på Windows Communication Foundation (WCF), kan med lätthet lägga till ett sådant gränssnitt genom lämplig konfigurering av WCF.

In this thesis we examine methods for evaluating a traffic alarm system. Nuisance alarms can quickly increase the volume of alarms experienced by the alarm operator and obstruct their work. We propose two methods for removing a number of these nuisance alarms, so that events of higher priority can be targeted. A parallel correlation analysis demonstrated significant correlation between single and clusters of alarms, presenting a strong cause for causality. While a serial correlation was performed, it could not conclude evidence of consequential alarms. In order to assist Trafikverket with maintenance scheduling, a long short-term model (LSTM) model, to predict univariate time-series of discretely binned alarm sequences. Experiments conclude that the LSTM model provides higher precision for alarm sequences with higher repeatability and recurring patterns. For other, randomly occurring alarms, the model performs unsatisfactory. / Den här examensuppsatsen granskar olika metoder för att utvärdera ett larmsystem med inriktning mot trafiksäkerhet. Störande larm kan skapa stora mängder larm som försvårar arbetet för larmoperatörer. Vi föreslår två metoder för att avlägsna störande larm, så att uppmärksamhet kan riktas mot varningar med högre prioritet. En parallell korrelationsanalys som demonstrerade hög korrelation mellan både enskilda och kluster av larm. Detta presenterar ett starkt orsakssamband. En korskorrelation utfördes även, men denna kunde inte fastställa existens av s.k. följdlarm. För att assistera Trafikverket med schemaläggning av underhåll har en long short-term memory (LSTM) modell implementerats för att förutspå univariata tidsserier av diskretiserade larmsekvenser. Utförda experiment sammanfattar att LSTM modellen presterar bättre för larmsekvenser med återkommande mönster. För mera slumpmässigt genererade larmsekvenser, presterar modellen med lägre precision.

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