Thesis (Masters Diploma(Technology)--Cape Technikon, Cape Town, 1988 / The project entails designing and installing an emergency fire telephone system (EFTS) for the 23 storey Cape Town Administrative Civic Centre. The original system, with its mostly analogue circuitry, has no documentation available, is difficult to maintain and has become unreliable. After considering alternative systems the most economical option was to expand the original system by adding more extension telephones and to redesign the control section. The new EFTS briefly operates as follows: The status of ninety six extension telephones, installed at the emergency exits on each floor, are displayed on a mimic status display which both operators can monitor. Any emergency call can be identified by a green flashing LED and a distinctive bleep. The LED indicates the exact position and number of the telephone in the building, Each operator has a keypad and a two digit numeric display fitted his telephone. The operator can immediately answer incoming calls by pressing the queue button. Calls queue on a first in first out basis. The number of the extension telephone will be displayed on a numeric display. The operator can also select the extension he wishes to contact, by dialling the extension number on the keypad. The EFTS consists of nine printed circuit boards. A rack mounted Microcomputer board, made up of a Motorola MC6809 microprocessor, six 6821 PlAs, 2 kilobyte RAM, up to 16 kilobyte ROM and a watchdog timer controls the EFTS.Two Telephone Controller boards process voice signals and generate logic control signals for the CMOS voice switching circuitry on the Multiplexer Monitor boards. Six Multiplexer Monitor boards switch the two operators to any of the ninety six extension telephones and continuously monitor the extension telephone lines for faults and handset statuses. Noise and over voltage line protection is provided. The multiplexing of the 192 LEDs on the Mimic Status Display is controlled by the Microcomputer board. An unusual principle used in this design is the combination of low frequency AM and audio to affect communication. Two uninterruptable power supplies provide user independence from mains. Software used for the EFTS is written in 6809 Assembly Language. A Real time interrupt controls the Mimic Status Display. Operator actions are interfaced with the program logic by means of hardware interrupts.

The introduction of wireless device text messaging, as an alternative to a citizen placing a telephone call for police help, generates the need for new polices and processes relevant to police call-taker, police dispatcher, and police officer response to reported emergencies. Little scholarly research explores the policy issues around the use of text 9-1-1 within public safety answering point operations. Using systems theory as the foundation, the purpose of this qualitative case study was to explore the potential use of written communication via a wireless device text message for reporting a police emergency. Research questions focused on the reciprocal relationships in communication used to initiate an emergency call for service and police response. A maximum variation purposeful sampling technique was used to recruit 16 individuals with knowledge of placing, receiving, or responding to a police emergency request, for this study. Data collection methods also included police call-taker observations of four active 9-1-1 calls, 9-1-1 and police radio recordings of the calls, physical artifacts, and documentation. All data were inductively coded and then subjected to a thematic analysis procedure. Findings indicate that text messages may be a preferred option in certain types of situations, such as home invasions, where the victim may not be able to speak to call-takers as a matter of protecting personal safety. However, the use of text messages is also perceived as creating a potential for delayed police response due to the asynchronous nature of the process. Recommendations to police executives and policy makers include enhancing call-taker training and citizen instruction prior to the text messaging integration, thereby promoting positive social change through enhancing public safety by providing another mechanism for direct citizen-police communication.

The user interface for a proposed alternative emergency service was conceived and designed for a standard touch-tone telephone. The service would allow a user to activate an automated, pre-recorded message containing information to aid emergency responders. The user must only press a few specified keys on the telephone key-pad, avoiding the need for verbal interaction with a dispatcher. The interface was designed in terms of providing the necessary instructions for activation and considering various input strategies and feedback. Icons, written instructions, and voice feedback were employed in the development of a successful and effective interface between the user and the system. Because the system is expected to attract elderly users and families with young children, the performance and attitudes of these two age groups in regard to a system prototype were examined to determine if the interface was suitable. A two and eight second initial system response time were imposed upon users to determine any effect these delays might have on user response time, error rate, and subjective attitudes. Additionally, a secondary task, designed to increase cognitive loading was employed to determine if the system is usable while the user is engaged in a dual-task environment. The dependent variables used to gauge the effects of the manipulated variables include the objective measures of user response time and error rate and subjective questionnaire responses. The results of the study indicate that the elderly adults and young children were able to activate the system successfully. System response time and cognitive loading had no significant effect on user performance or subjective attitudes. Distinct practice effects were observed. Attitude scales indicated satisfaction with the service and its interface. Finally, a significant effect of age was observed on average user response time, with the elderly activating the system quicker than the children. / Master of Science

A call taker is the first point of contact in the emergency service system and thus the interface between the caller and ambulance dispatch. Misunderstandings in an emergency call have implications for the survival of patients. Using an applied conversation analytic approach this study examined participants’ use of conversational repair as an interactional strategy. Data included 101 calls from a South African emergency medical services call centre. The data set was comprised of two distinct subsets, namely: the 107 and public corpora. The 107 corpus (53 calls) contained calls from a general emergency call centre. The 107 caller thus served as a mediating party on behalf of the public caller. The public corpus (48 calls) comprised calls received directly from members of the public. The data subsets afforded a unique opportunity to analyse ways in which participants to an emergency call manage asymmetries of knowledge. Differential patterns of the type and purpose of repair were tracked across both data sets and similarities and differences were explored. Both data sets showed that participants’ choice of interactional strategies was customized based on an ongoing assessment of knowledge asymmetries. However, whilst knowledge asymmetries posed some constraints an overriding interactional constraint, inherent within the institutional nature of the emergency call, was a rigid adherence to routinized protocols. The call taker’s dilemma was thus identified as the management of these constraints through the frequent use of conversational repair. Although a level of responsiveness is required to glean quality information from callers, high volumes of emergency calls would not be possible without routinized protocols. However, increased orientation to routinized protocols led to a decreased orientation to responsiveness. This research therefore showed that knowledge symmetry is not necessarily more advantageous but that successful call trajectory is reliant on the call taker’s ability to maximize the collaborative nature of the interaction and effectively negotiate through the judicious use of repair and other relevant interactional strategies. This has important implications for call taker training.

Indoor/Outdoor Location of Cellular Handsets Based on Received Signal Strength Jian Zhu 123 pages Directed by Dr. Gregory D. Durgin Accurate geo-location is an important emerging technology for public safety, commercial use, and military application. Especially, in the United States, the wireless Enhanced 911 (E911) rules by the Federal Communication Commission (FCC) seek to provide 911 dispatchers with additional information on wireless 911 calls. This dissertation presents a novel technique for indoor/outdoor location of cellular handsets based on received signal strength (RSS) measurements taken by a cellular handset of the surrounding base stations. RSS location accuracy for different environments is studied as a function of base station separation distance, cell sector density, measurement density, radio propagation environment, and accuracy of measurement. The analytical and experimental results in this thesis serve as a guideline for the accuracy of RSS signature location technology under different conditions. Accurate outdoor to indoor penetration models are proposed and validated for dense urban areas by introducing pseudo-transmitters to simulate the wave-guiding effects in urban canyon environments. A set of location algorithms is developed to improve location accuracy. Furthermore, an algorithm to discriminate between indoor and outdoor users is proposed and validated. The research results demonstrate the feasibility of RSS location techniques to meet the FCCs requirements for E911 accuracy in urban and semi-urban environments. The techniques remain accurate for indoor handsets. The results also suggest that a hybridization of the handset-based GPS method and the RSS signature method may prove to be the most effective solution for locating handsets across a range of environments; including rural, suburban, dense urban, and indoor.

Smart phones today have become increasingly popular with the general public for its diverse abilities like navigation, social networking, and multimedia facilities to name a few. These phones are equipped with high end processors, high resolution cameras, built-in sensors like accelerometer, orientation-sensor, light-sensor, and much more. According to comScore survey, 25.3% of US adults use smart phones in their daily lives. Motivated by the capability of smart phones and their extensive usage, I focused on utilizing them for bio-medical applications. In this thesis, I present a new application for a smart phone to quantify the vital signs such as heart rate, respiratory rate and blood pressure with the help of its built-in sensors. Using the camera and a microphone, I have shown how the blood pressure and heart rate can be determined for a subject. People sometimes encounter minor situations like fainting or fatal accidents like car crash at unexpected times and places. It would be useful to have a device which can measure all vital signs in such an event. The second part of this thesis demonstrates a new mode of communication for next generation 9-1-1 calls. In this new architecture, the call-taker will be able to control the multimedia elements in the phone from a remote location. This would help the call-taker or first responder to have a better control over the situation. Transmission of the vital signs measured using the smart phone can be a life saver in critical situations. In today's voice oriented 9-1-1 calls, the dispatcher first collects critical information (e.g., location, call-back number) from caller, and assesses the situation. Meanwhile, the dispatchers constantly face a "60-second dilemma"; i.e., within 60 seconds, they need to make a complicated but important decision, whether to dispatch and, if so, what to dispatch. The dispatchers often feel that they lack sufficient information to make a confident dispatch decision. This remote-media-control described in this system will be able to facilitate information acquisition and decision-making in emergency situations within the 60-second response window in 9-1-1 calls using new multimedia technologies.

Den här studien undersöker om det kan utrönas skillnader, och om så är fallet, i vad dessa skillnader består i, mellan manligt och kvinnligt skriftspråk i katastrofjournalistik med avseende på diskoteksbranden i Göteborg 1998 och tsunamikatastrofen 2004.    Dessa händelser valdes med utgångspunkt av att de liknar varandra, inte bara i att de faller under katastrofjournalistik, utan för att de båda krävde ett stort antal svenska dödsoffer och genom detta haft djupgående påverkan på det svenska samhället. Studiens empiri består av 78 nyhetsartiklar från Dagens Nyheteroch Svenska Dagbladet, vilka genererats med hjälp av databasen Retriever. Dessa har sedan undersökt noga genom text- och innehållsanalys med både kvantitativa och kvalitativa inslag.    Resultatet av studien visade att det i materialet fanns språkmässiga skillnader mellan könen. De kvinnliga journalisterna tenderade att använda fler pronomen i sina texter och att beskriva händelserna mer detaljrikt än männen. Dessutom tenderade nyhetstexterna som författats av kvinnor att vara mer emotionella och innehålla fler ord än de som författats av män, samtidigt som meningslängden i deras artiklar var kortare än männens. / This study is aiming to investigate if there is a detectable difference, and if so, what characterizes that difference, between female and male written language in news reports from two catastrophic events that have had great impact on the Swedish society, namely the disco fire in Gothenburg in 1998 and the tsunami that hit the Bay of Bengal in 2004.   For the purpose of the investigation, 78 articles were pulled from the Swedish newspapers Dagens Nyheterand Svenska Dagbladet, with help by the newspaper search engine Retriever. Those articles were then closely examined through the use of both qualitative and quantitative content analysis.    The study showed that there were some differences to be found in the language use of female and male journalists concerning the two news events. Some of these differences being that the female reporters both tended to use more pronouns in their texts, and too describe events in more detail than their male colleagues. Other features that set female and male articles apart, were that female texts tended to contain more words than male texts at the same time as being more emotionally orientated. Articles by female writers also tended to be divided into shorter sentences than articles by male writers.