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  • × author_ss:"Lam, W."
  1. Lam, W.; Mostafa, J.: Modeling user interest shift using a Baysian approach (2001) 0.00 
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    Abstract
    We investigate the modeling of changes in user interest in information filtering systems. A new technique for tracking user interest shifts based on a Bayesian approach is developed. The interest tracker is integrated into a profile learning module of a filtering system. We present an analytical study to establish the rate of convergence for the profile learning with and without the user interest tracking component. We examine the relationship among degree of shift, cost of detection error, and time needed for detection. To study the effect of different patterns of interest shift on system performance we also conducted several filtering experiments. Generally, the findings show that the Bayesian approach is a feasible and effective technique for modeling user interest shift
    Type
    a
  2. Lam, W.; Chua, A.: ¬The mismanagement of knowledge management (2005) 0.00 
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    Abstract
    Purpose - To examine the causes of knowledge management (KM) failure. Design/methodology/approach - A multi-case analysis approach was used to review five documented cases of KM failure in the literature. Categories of risk were identified through an iterative analysis of each case. Findings - There are four main categories of risk associated with KM failure, namely technology risk, culture risk, content risk and project management risk. The nature of these risks differs dependent upon the stage of a KM project. Research limitations/implications - A limited number of cases were reviewed. Practical implications - Practitioners need to proactively manage risk to avoid failure in KM projects. Originality/value - Proposes a taxonomy of KM risk.
    Type
    a
  3. Srinivasan, P.; Ruiz, M.E.; Lam, W.: ¬An investigation of indexing on the WWW (1996) 0.00 
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    Abstract
    Proposes a model that assists in understanding indexing on the WWW. It specifies key features of indexing startegies that are currently being used. Presents an experiment assessing the validity of Inverse Document Frequency (IDF) as a term weighting strategy for WWW documents. The experiment indicates that IDF scores are not stable in the heterogeneous and dynamic context of the WWW. Recommends further investigation to clarify the effectiveness of alternative indexing strategies for the WWW
    Type
    a
  4. Lam, W.; Wong, K.-F.; Wong, C.-Y.: Chinese document indexing based on new partitioned signature file : model and evaluation (2001) 0.00 
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    Abstract
    In this article we investigate the use of signature files in Chinese information retrieval system and propose a new partitioning method for Chinese signature file based on the characteristic of Chinese words. Our partitioning method, called Partitioned Signature File for Chinese (PSFC), offers faster search efficiency than the traditional single signature file approach. We devise a general scheme for controlling the trade-off between the false drop and storage overhead while maintaining the search space reduction in PSFC. An analytical study is presented to support the claims of our method. We also propose two new hashing methods for Chinese signature files so that the signature file will be more suitable for dynamic environment while the retrieval performance is maintained. Furthermore, we have implemented PSFC and the new hashing methods, and we evaluated them using a large-scale real-world Chinese document corpus, namely, the TREC-5 (Text REtrieval Conference) Chinese collection. The experimental results confirm the features of PSFC and demonstrate its superiority over the traditional single signature file method
    Type
    a
  5. Lam, W.; Chan, K.; Radev, D.; Saggion, H.; Teufel, S.: Context-based generic cross-lingual retrieval of documents and automated summaries (2005) 0.00 
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    Abstract
    We develop a context-based generic cross-lingual retrieval model that can deal with different language pairs. Our model considers contexts in the query translation process. Contexts in the query as weIl as in the documents based an co-occurrence statistics from different granularity of passages are exploited. We also investigate cross-lingual retrieval of automatic generic summaries. We have implemented our model for two different cross-lingual settings, namely, retrieving Chinese documents from English queries as weIl as retrieving English documents from Chinese queries. Extensive experiments have been conducted an a large-scale parallel corpus enabling studies an retrieval performance for two different cross-lingual settings of full-length documents as weIl as automated summaries.
    Type
    a
  6. Lam, W.; Yang, C.C.; Menczer, F.: Introduction to the special topic section on mining Web resources for enhancing information retrieval (2007) 0.00 
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    Abstract
    The amount of information on the Web has been expanding at an enormous pace. There are a variety of Web documents in different genres, such as news, reports, reviews. Traditionally, the information displayed on Web sites has been static. Recently, there are many Web sites offering content that is dynamically generated and frequently updated. It is also common for Web sites to contain information in different languages since many countries adopt more than one language. Moreover, content may exist in multimedia formats including text, images, video, and audio.
    Type
    a
  7. Yang, C.C.; Lam, W.: Introduction to the special topic section on multilingual information systems (2006) 0.00 
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    Abstract
    The information available in languages other than English on the World Wide Web and global information systems is increasing significantly. According to some recent reports. the growth of non-English speaking Internet users is significantly higher than the growth of English-speaking Internet users. Asia and Europe have become the two most-populated regions of Internet users. However, there are many different languages in the many different countries of Asia and Europe. And there are many countries in the world using more than one language as their official languages. For example, Chinese and English are official languages in Hong Kong SAR; English and French are official languages in Canada. In the global economy, information systems are no longer utilized by users in a single geographical region but all over the world. Information can be generated, stored, processed, and accessed in several different languages. All of this reveals the importance of research in multilingual information systems.
    Type
    a

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