BACKGROUND After alcohol and tobacco, cannabis is the most widely used psychoactive substance in many countries worldwide. Although approximately one in ten users develops serious problems of dependency, only a minority attend outpatient addiction counseling centers. A Web-based intervention could potentially reach those users who hesitate to approach such treatment centers. OBJECTIVE To test...

Chat-based Computer Supported Collaborative Learning (CSCL) often suffers from limitations due to the communication medium. A frequently reported consequence is the lack of discourse coherence and by this a lack of cognitive coherence in the learning process. To overcome these deficiencies, the implementation of explicit references with chat messages caused higher learning results. However up t...

This paper presents a novel approach to Emotion Estimation that assesses the affective content from textual messages. Our main goals are to detect emotion from chat or other dialogue messages and to employ animated agents capable of the emotional reasoning based on the textual interaction. In this paper, the emotion estimation module is applied to a chat system, where avatars associated with ch...

As networked digital communications proliferate in military operational command and control (C2), chat messaging is emerging as a preferred communications method for team coordination. Chat room logs provide a potentially rich source of data for analysis in after-action reviews, affording considerable insight into the decision-making processes among the training audience. The multitasking natur...

Meetings and collaborative work are part of the everyday business life. Audio communication in the form of VoIP and instant messaging-based chat communication offer new and inexpensive ways to communicate in groups. Our previous research has shown that the selection of either audio or chat has a significant impact on the collaborative productivity. This experiment observes the impact of selecti...

Recent years have seen a pervasive usage of mobile-based instant messaging apps, which are popularly known as chat apps. On users’ mobile devices, chat logs are usually stored encrypted. This paper is concerned with discovering the decryption key of chat-log database files as they are used by popular chat apps like WhatsApp andWeChat. We propose a systematic and generalized information-flow bas...

The open source platform MobileCoach (mobile-coach.eu) has been used for various behavioral health interventions in the public health context. However, so far, MobileCoach is limited to text message-based interactions. That is, participants use error-prone and laborious text-input fields and have to bear the SMS costs. Moreover, MobileCoach does not provide a dedicated chat channel for individu...

To date, a variety of automated negotiation agents have been created. While each of these agents has been shown to be effective in negotiating with people in specific environments, they lack natural language processing support required to enable real-world types of interactions. In this paper we present NegoChat, the first negotiation agent that successfully addresses this limitation. NegoChat ...

This study reports the results of a laboratory experiment exploring interactions between humans and a conversational agent. Using the ChatScript language, we created a chat bot that asked participants to describe a series of images. The two objectives of this study were (1) to analyze the impact of dynamic responses on participants’ perceptions of the conversational agent, and (2) to explore be...