In traditional Information Retrieval (IR), users often express their needs using simple keywords, because this is the most simple way to query systems. Queries composed of simple keyword terms are also very used in structured IR (i.e. IR on structured documents like XML documents), since they do not require any knowledge of the documents structure. However, such queries are often not sufficient...

During emergency situation events it is important to acquire as much information about the event as possible, and social media sites like Twitter offer important real-time user contributed data. Typical Information Filtering techniques are keyword-based approaches or focused on co-occurrence with keywords. However, these approaches can miss relevant local information if messages do not contain ...

Content-based multimedia information retrieval is the hot point of researchers in many domains. But traditional feature vector based retrieval method can not provide retrieval on the semantic level. Integrated with our image retrieval system, we propose a new approach to generate semantic template automatically in the process of relevance feedback, and construct a network of semantic template w...

Abstract Democracy is one of the most contested words in English language. In Africa, these complexities are compounded by question whether democracy a colonial imposition. Cheeseman and Sishuwa provide historiography debates around democracy, track how narratives have developed over time, argue that there widespread public support for form what they call “consensual democracy.” This not to say...

corrective feedback (cf) and its different types have long absorbed many scholars and practitioners. as ellis (2009) mentioned some experimental studies need to be carefully designed to discover the relative effectiveness of each of these cf techniques. the goal of this qualitative study was to discover whether the employment of different cf strategies could bring about an attitudinal shift. to...