Alvin Cerdena Valera

Alvin Cerdena Valera
Victoria University of Wellington · School of Engineering and Computer Science

Doctor of Philosophy

About

41
Publications
15,637
Reads
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926
Citations
Additional affiliations
December 2017 - present
Victoria University of Wellington
Position
  • Professor (Associate)
July 2015 - September 2017
Singapore Management University
Position
  • Research Associate
July 2007 - July 2015
Institute for Infocomm Research
Position
  • Engineer
Education
August 2010 - June 2015
National University of Singapore
Field of study
  • Electrical and Computer Engineering
January 2001 - December 2002
National University of Singapore
Field of study
  • Computer Science
June 1993 - October 1998
University of the Philippines
Field of study
  • Computer Engineering

Publications

Publications (41)
Article
The performance of in-network caches has traditionally been evaluated using well-understood metrics such as the cache hit rate. This extends to the field of Information-Centric Networking (ICN), where caching strategies are evaluated in the same way. In this paper, we argue that in the subdomain of information-centric Internet of Things (IoT), thes...
Article
Full-text available
Network data constantly evolves with new network applications and protocols. There is a need for robust techniques to detect anomalous behaviour. Offline models trained with static data lose validity when new variants of traffic emerge. They require retraining but the need for ground truth and lengthy training times make this task challenging. Mean...
Article
Full-text available
The use of technology for social connectivity and achieving engagement goals is increasingly essential to the overall wellbeing of our rapidly ageing population. While much of the extant literature has focused on home automation and indoor remote health monitoring; there is a growing literature that finds personal health and overall wellbeing impro...
Article
Full-text available
Resource-intensive applications on smart vehicles is posing difficulties to the use of traditional cloud computing for computation offloading in vehicular networks. In particular, the long transmission distance between the vehicles and the cloud center can cause high latency and poor reliability which may degrade application performance and quality...
Conference Paper
Full-text available
Over a few decades, there is a steady accretion of life expectancy in many countries. Significant advances in modern healthcare technologies, medicines and overall health care awareness gave many to lead a prolonged healthy life. Over the past few years, there has been a huge demand for unobtrusive health monitoring systems from both medical profes...
Conference Paper
In Information-Centric Networking (ICN), the ability to cache content at multiple points in the network is one of the most important factors in the speed and reliability of content delivery. However, in the constrained environment of the Internet of Things (IoT), memory is often a scarce resource, which means that particular focus needs to be place...
Preprint
In-network caching is a central aspect of Information-Centric Networking (ICN). It enables the rapid distribution of content across the network, alleviating strain on content producers and reducing content delivery latencies. ICN has emerged as a promising candidate for use in the Internet of Things (IoT). However, IoT devices operate under severe...
Conference Paper
Full-text available
In-network caching is one of the most defining aspects of Information-Centric Networking (ICN). It ensures that relevant content is readily available across the network, even if the original producer is not reachable. However, in the Internet of Things (IoT), where memory is often severely limited, nodes cannot simply cache any and all content they...
Chapter
The paradigm of aging-in-place - where the elderly live and age in their own homes, independently and safely, with care provided by the community - is compelling, especially in societies that face both shortages in institutionalized eldercare resources, and rapidly-aging populations. When the number of elderly who live alone rises rapidly, support...
Conference Paper
The rapid ageing population is posing challenges to many countries all over the world, particularly in the provision of care to the growing number of elderly who are living alone. Allowing the elderly to age-in-place, i.e., live safely and independently in the comfort of their own homes is a model that can potentially address the resource constrain...
Article
We address the problem of transferring bulk data in environmentally-powered wireless sensor networks where duty cycle compliance is critical for their uninterrupted operation. We propose Pump-and-Nap, a packet train forwarding technique that maximizes throughput while simultaneously enforcing compliance to dynamic duty cycle limitations. A node usi...
Article
The dynamic and unpredictable nature of energy harvesting sources available for wireless sensor networks, and the time variation in network statistics like packet transmission rates and link qualities, necessitate the use of adaptive duty cycling techniques. Such adaptive control allows sensor nodes to achieve long-run energy neutrality, where ener...
Conference Paper
Full-text available
Singapore faces a major challenge in providing care and support for senior citizens due to its rapidly ageing population and declining old-age support ratio. The concept of Ageing-in-Place was introduced by the Singapore government [1] to allow older people to live independently in their own homes and communities so that the need for institutionali...
Article
Advances in energy harvesting technologies and ultra low-power computing and communication devices are enabling the realization of environmentally-powered wireless sensor networks (EPWSNs). Because of limited and dynamic energy supply, EPWSNs are duty-cycled to achieve energy-neutrality, a condition where the energy demand does not exceed the energ...
Conference Paper
Full-text available
Airborne networks have potential applications in both civilian and military domains -- such as passenger in-flight Internet connectivity, air traffic control and in intelligence, surveillance and reconnaissance (ISR) activities. However, airborne networks suffer from frequent disruptions due to high node mobility, ad hoc connectivity and line-of-si...
Conference Paper
Full-text available
Wireless sensor networks (WSNs) typically consist of sensor nodes and gateways that operate on devices with limited resources. As a result, WSNs require bandwidth-efficient and energy-efficient application protocols for data transmission. Message Queue Telemetry Transport (MQTT) and Constrained Application Protocol (CoAP) are two such protocols pro...
Article
In environmentally-powered wireless sensor networks (EPWSNs), low latency wakeup scheduling and packet forwarding is challenging due to dynamic duty cycling, posing time-varying sleep latencies and necessitating the use of dynamic wakeup schedules. We show that the variance of the intervals between receiving wakeup slots affects the expected sleep...
Conference Paper
Wireless ad hoc routing protocols must employ accurate and rapid link failure detection mechanisms in order to maintain valid multihop routes and provide high data delivery rates. Hello-based failure detection is the predominant failure detection mechanism due to its ease of implementation. Despite its prevalence, no analytical work has been carrie...
Article
Full-text available
The selection of a path in a network from one node to another is performed by a routing protocol, often using the shortest path approach. However, it has been shown that in wireless networks, the shortest path approach tends to select paths with wireless links that are only intermittently available and often unstable, resulting in extensive loss of...
Article
This paper proposes XOR-BiDO, a data delivery scheme (DDS) suited for multihop underwater acoustic networks characterized by regular bidirectional traffic streams. DDSs for multihop underwater networks usually assume a single- sink configuration, where most of the transmissions flow in a single direction. Throughput performance decreases and fairne...
Conference Paper
Full-text available
Various novel applications of underwater acoustic sensor networks have emerged or been proposed in recent years. In this paper, we present a complete system implementation of a robust multihop underwater network for sensing applications. At the core of the system is a robust data delivery scheme which uses opportunistic automatic repeat request (AR...
Article
In an environmentally-powered wireless sensor network, where nodes are powered solely by harvesting energy from ambient sources, node operation highly depends on the energy availability and harvesting rate. For duty-cycling schemes to support existing wireless sensor network applications, they need to adapt the nodes' sleep-wake schedules according...
Conference Paper
Full-text available
Wireless multihop ad hoc networks face a multitude of challenging problems including highly dynamic multihop topologies, lossy and noisy communication channels, and sporadic connectivity which contribute to frequent link failures. Rapid and accurate link failure detection is therefore important to maintain correct and optimum operation of network r...
Conference Paper
Full-text available
We are witnessing pervasive use of wireless sensor networks (WSN)s in a wide variety of applications such as monitoring of road infrastructure. As they are expected to be deployed in harsh environments for long durations, the research community have turned their attention to tapping on ambient energy to power such networks. However, since energy ha...
Conference Paper
Full-text available
As reliable data delivery over a long-range single-hop underwater acoustic link is considerably challenging due to severe channel impairments, multihop data transmission schemes over one or more relay nodes have been proposed. In this paper, we propose a data delivery scheme using a fully-opportunistic ARQ that employs bidirectional overhearing, wh...
Conference Paper
Full-text available
In the offshore engineering community, reliable deep-water anchor performance is critical for mooring floating platforms such as Mobile Offshore Drilling Units. In a typical installation, an anchor is fully embedded into the seabed (up to 100 m). This has to be done with high fidelity as anchor failure can cause floating units to go adrift, damagin...
Conference Paper
Full-text available
Underwater acoustic networking is an emerging technology platform for oceanographic data collection, pollution monitoring, offshore exploration and tactical surveillance applications. Design of reliable and efficient communications protocols is challenging due to the unique characteristics of underwater acoustic channels. In this paper, we present...
Conference Paper
This paper discusses the design of a broadband wireless network infrastructure which itself is a rain measurement platform for applications such as disaster alarm and sudden hazard decision management systems. A sensor testbed is setup which consists of a hybrid broadband wireless network in conjunction with real-time acoustic rain rate point senso...
Article
Full-text available
A wireless multihop network is a communications network composed of nodes equipped with wireless interfaces and organized in an ad hoc manner. It has become an attractive and practical solution for providing flexible and extended wireless coverage over large areas. Measurement of physical layer quantities can provide useful information in the desig...
Conference Paper
Full-text available
Topology control by means of transmit power adjustment is a well-studied technique for improving the network capac- ity and energy efficiency of wireless ad hoc networks. In this paper, we investigate the feasibility of connectivity and topology control in a real IEEE 802.11b testbed composed of inexpensive commercial off-the-shelf (COTS) routers....
Article
Full-text available
A mobile ad hoc network is an autonomous system of infrastructure-less, multihop, wireless mobile nodes. Reactive routing protocols perform well in this environment due to their ability to cope quickly against topological changes. This paper proposes a new routing protocol named CHAMP (caching and multiple path) routing protocol. CHAMP uses coopera...
Article
A mobile ad hoc network is an autonomous system of infrastructureless, multihop wireless mobile nodes. Reactive routing protocols perform well in such an environment due to their ability to cope quickly against topological changes. In this paper, we propose a new routing protocol called Caching and Multipath (CHAMP) Routing Protocol. CHAMP uses coo...
Conference Paper
Full-text available
A mobile ad hoc network is an autonomous system of infrastructureless, multihop wireless mobile nodes. Reactive routing protocols perform well in such an environment due to their ability to cope quickly against topological changes. In this paper, we propose a new routing protocol called Caching and Multipath (CHAMP) Routing Protocol. CHAMP uses coo...
Conference Paper
Full-text available
We present the caching and multipath (CHAMP) routing protocol, a new protocol for mobile ad hoc networks that uses data caching and shortest multiple path routing to achieve both robustness against mobility and energy-efficiency. Simulation results show that a 5-packet FIFO data cache combined with 2 routes exhibits significantly better performance...

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