Clock synchronization is a crucial basic service in typical sensor networks, since the observations of distributed sensors more often than not need to be ordered (“a happened before b”) or otherwise related (“a and b happened within a time window of size x”) in time. Ad-hoc sensor networks exhibit characteristics which make the use of traditional clock-synchronization algorithms infeasible. Mor...

It is widely accepted that aggregate housing prices are predictable, but that excess returns to investors are precluded by the transactions costs of buying and selling property. We examine this issue using a unique data set—all private condominium transactions in Singapore during an eleven-year period. We model directly the price discovery process for individual dwellings. Our empirical results...

In radar systems, tracking targets in low signal-to-noise ratio (SNR) environments is a very important task. There are some algorithms designed for multitarget tracking. Their performances, however, are not satisfactory in low SNR environments. Track-before-detect (TBD) algorithms have been developed as a class of improved methods for tracking in low SNR environments. However, multitarget TBD i...

We develop a model of gradual information diffusion based on word of mouth communication. When news is initially released to a small fraction of investors, the expected diffusion rate (the change in the fraction of investors with the news) is initially increasing in time and only then decreases. Assuming risk-averse investors trade when they receive the news, the serial correlation of stock ret...

This paper addresses the problem of tracking a dim moving point target in a sequence of IR images. The proposed tracking system, based on the track-before-detect (TBD) approach, is designed to track and detect dim maneuvering targets from an image sequence under low SNR conditions; a dynamic programming algorithm (DPA) is used to process the frames in the sequence. This paper deals with the pra...

Introduction This study aims to explore the impact of Parent Participation Program on the development of developmental delay children. Methods Pretest-posttest equivalent-group experimental design study was used in this paper. A total of 30 pairs of developmental delay children aged 0-72 months and their parents participated into this study. They were divided into two groups, namely control g...

The development of IT involves major changes in many work settings. Theories of organizational change predict negative consequences of change-related work load on back pain to be less when employees participate in the planning and implementation of change. In a longitudinal field study the effects of participation in the introduction of a new internet service were tested. 29 employees (16 f, 13...

BACKGROUND High rates of sedentary behaviors in older adults can lead to poor health outcomes. However, new technologies, namely exercise-based videogames ("exergames"), may provide ways of stimulating uptake and ongoing participation in physical activities. Older adults' perceptions of the use of technology to improve health are not known. OBJECTIVE The study aimed to determine use and perce...