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Nếu chiếc xe được xúc động, gửi một cảnh báo đến điện thoại di động của chủ sở hữu. Sau đó, chủ sở hữu sẽ gửi một lệnh để các WS để bảo vệ chiếc xe của mình không bị đánh cắp. Dựa trên phản ứng của kẻ trộm, yêu cầu khác nhau / lệnh được gửi đến và được cung cấp cho phản hồi để kẻ trộm cho đến khi các động cơ xe hơi đã bị khoá cuối cùng. | 344 S. Song Fig. 14.4. Asynchronous mode The voice mode of interaction with an application requires speech recognition and text-to-speech synthesis TTS technology. In principle either of these transforms can occur on either a client or a server. However unlike personal computers the current generation of mobile devices does not have the processing power to perform these transforms and so we assume in the following that they are performed on a voice server. We further assume that the range of input commands is constrained so that a personalized voice recognition function is not required. As shown in Fig. 14.5 a voice server is installed to act as a proxy client to the web application server. The web application server provides dynamic content in an XML format known as VoiceXML. The voice server renders VoiceXML into speech. VoiceXML also contains dialog tags that prescribe possible inputs. The user s vocal response can be matched to one of the allowed responses and the voice server transmits this as a new request to the web application server. 14.3 Wireless e-Business Applications Wireless e-business applications are sometimes called mobile applications. Mobile applications give people the convenience to access relevant information and to act on that information at any time and any place. In the context of e-business it translates into increased sales better customer service and lower transaction costs. 14 Mobile Commerce and Wireless e-Business Applications 345 Fig. 14.5. Voice mode Just like e-business there are two types of wireless e-business applications horizontal and vertical. Horizontal applications are those used across a broad selection of end users. Vertical applications on the other hand are optimized for a specific target market. Figure 14.6 illustrates the basic categories for mobile applications. 14.3.1 Horizontal Applications Messaging Services Since 1992 short messaging service SMS has been providing the ability to send and receive text messages to
