Louis Tan

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OBJECTIVES To assess the utility of asking for presence of progressive forgetfulness (PF) prior to administering the Abbreviated Mental Test (AMT) when screening for dementia in the community-dwelling elderly Chinese. METHODS This was a two-phased community-based survey of elderly subjects (>or=50 yrs). In phase one, subjects were asked for PF and(More)
We study the problem of broadcasting a Gaussian source over a Gaussian broadcast channel to two users with individual source-channel bandwidth mismatches, under a quadratic distortion measure. Specifically we study the tradeoff between the achievable distortion pairs between the two users. The case when the bandwidth-expansion factors of the two users are(More)
We study the problem of broadcasting a binary source over a two-receiver erasure broadcast channel with source-channel bandwidth mismatch under a Hamming distortion measure. Given the distortion constraints of both users, we establish a lower bound for the minimum latency required and show that this bound is at least as tight as the one obtained from the(More)
Motivated by error correction coding in multimedia applications, we study the problem of broadcasting a single common source to multiple receivers over heterogeneous erasure channels. Each receiver is required to partially reconstruct the source sequence by decoding a certain fraction of the source symbols. We propose a coding scheme that requires only(More)
We study a lossy source-broadcasting problem involving the transmission of a binary source over a two-receiver erasure broadcast channel. The motivation of our work stems from the problem faced by a server that wishes to singly broadcast content to a diverse set of users with fractional source reconstruction requirements. In this problem, the server wishes(More)
Most Parkinson's disease patients will receive levodopa therapy, and of these, the majority will develop some levodopa-induced complications. For many patients, the first complication to develop is the decline in the duration of therapeutic benefit of each levodopa dose, a phenomenon commonly termed 'wearing-off'. There is already extensive literature(More)
We study a source-broadcasting problem involving an erasure broadcast channel with feedback. The receivers each require a certain fraction of a source sequence, and we are interested in the minimum latency, or transmission time, required to serve them all. We first show that for a two-user broadcast channel, a point-to-point outer bound can always be(More)
Objective. Wearable and wireless motion sensor devices have facilitated the automated computation of speed, amplitude, and rhythm of hand motion tasks. The aim of this study is to determine if there are any biological influences on these kinematic parameters. Methods. 80 healthy subjects performed hand motion tasks twice for each hand, with movements(More)
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