Niwat Thepvilojanapong

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In this paper, we present Hierarchy-Based Any-cast Routing (HAR), a routing protocol for collecting data over multi-hop, wireless sensor networks. The design of the protocol aims to satisfy the requirements of sensor networks that every sensor transmits sensed data to the base station periodically or spontaneously. The base station constructs hierarchical(More)
Information sharing has undeniably become ubiquitous in the Internet age. The global village created on the Internet provides people with instant access to information and news on events occurring in a remote area, including access to video content on websites such as YouTube. Thus, the Internet has helped us overcome barriers to information. However, we(More)
Recent mobile devices are integrated with various kinds of sensors, thereby allowing people to capture what stationary sensing devices cannot easily acquire. We term the systems that exploit the ubiquity of the users of such devices <i>Human Probes</i>. To realize a Human-Probe environment, our research group has examined the usefulness of pressure sensors(More)
Capturing useful data in a complex and dense urban space is an inherently challenging task. There is so much data people can capture in a city, yet they may fail to capture important information, some of which they don't even know that it exists. In this paper, we discuss an implicit approach to urban sensing and introduce an implicit sensing system that(More)
Temperature in an urban area exhibits a complicated pattern due to complexity of infrastructure. Despite geographical proximity, structures of a group of buildings and streets affect changes in temperature. To investigate the pattern of fine-grained distribution of temperature, we installed a densely distributed sensor network called UScan. In this paper,(More)
SUMMARY Portable sensory devices such as sensors equipped mobile phones enable convenient sensing and monitoring of urban areas. Such devices, which are always carried by humans, are referred to as Human Probes. Instead of carrying out sensing activities independently, cooperation of Human Probes helps in realizing efficient urban sensing environments. In(More)
Meetings are considered to be indispensable for decision making of groups, and thus efficiency is required for meetings. However, it is difficult to discuss the efficiency of meeting in a quantitative way. Based on this background, we define metrics to quantify the meeting activity and we implement a system to evaluate the metrics called KAIHUI. A(More)