Longbiao Chen

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The research of collective behavior has attracted a lot of attention in recent years, which can empower various applications, such as recommendation systems and intelligent transportation systems. However, in traditional social science, it is practically difficult to collect large-scale user behavior data. Fortunately, with the ubiquity of smartphones and(More)
Bike sharing systems have been deployed in many cities to promote green transportation and a healthy lifestyle. One of the key factors for maximizing the utility of such systems is placing bike stations at locations that can best meet users' trip demand. Traditionally, urban planners rely on dedicated surveys to understand the local bike trip demand, which(More)
With the advent of smart home technologies, convenient and intuitive cyber-physical interaction methods are in great need. We demonstrate a touch-driven interaction system with home appliances via an NFC-enabled smartphone. By touching the phone to NFC tagged devices, we can establish connection and exchange information, control devices from phone, and(More)
Nowadays, natural and intuitive interactions between physical space and cyberspace have become increasingly important in our daily life. In this paper, we propose touch-driven interaction, which translates touch action into information flow in cyberspace, and result in media activity in physical space. Using NFC technology, user can simply touch smart phone(More)
Traditionally, the port container throughput, a crucial measurement of regional economic development, was manually collected by port authorities. This requires a large amount of human effort and often delays publication of this important figure. In this paper, by leveraging ubiquitous positioning techniques and open data, we propose a two-phase approach to(More)
Understanding social activities in Urban Activity Centers can benefit both urban authorities and citizens. Traditionally, monitoring large social activities usually incurs significant costs of human labor and time. Fortunately, with the recent booming of urban open data, a wide variety of human digital footprints have become openly accessible, providing us(More)
Gas-consumed urban transportation causes the problems of environment pollution and traffic congestion. Bicycling is an alternative transportation way for short-distance movement, which is a green and healthy style. Some modern cities are building Public Bicycle Sharing System (PBSS), so that inhabitants and tourists can temporarily use bicycles anywhere in(More)
Bike sharing is booming globally as a green transportation mode, but the occurrence of over-demand stations that have no bikes or docks available greatly affects user experiences. Directly predicting individual over-demand stations to carry out preventive measures is difficult, since the bike usage pattern of a station is highly dynamic and context(More)
Container ports are generally measured and compared using performance indicators such as container throughput and facility productivity. Being able to measure the performance of container ports quantitatively is of great importance for researchers to design models for port operation and container logistics. Instead of relying on the manually collected(More)
Automobiles are becoming increasingly important in our daily life. However, people usually need to cost lots of efforts and time to get their required services. On one hand, an automobile itself consists of many physical processes to achieve its traditional functionality, on the other hand, it is being integrated with more and more sensors and actuators,(More)