Teijo Lehtonen

Teijo Lehtonen
University of Turku | UTU · Department of Future Technologies

PhD

About

52
Publications
14,565
Reads
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701
Citations
Citations since 2016
14 Research Items
336 Citations
20162017201820192020202120220102030405060
20162017201820192020202120220102030405060
20162017201820192020202120220102030405060
20162017201820192020202120220102030405060
Additional affiliations
January 2017 - present
University of Turku
Position
  • Fellow
January 2014 - December 2016
University of Turku
Position
  • Fellow

Publications

Publications (52)
Chapter
This paper presents a Virtual Reality (VR) training application that is connected to maritime training simulator. We call this a VR extension to simulation training. The solution enables a more comprehensive training scenario than a traditional simulator exercise. The case study concerns emergency steering procedure, in which the steering of the ve...
Article
Interest towards sustainability in cruise industry has increased during recent years. This article focuses in the ship design and construction phase and what sustainability indicators can be collected – and adapted - from certification systems in other sectors. Certificates in land-based construction and hospitality sectors, as well as a general re...
Chapter
Due to the development of both computational power of mobile devices and display technology mixed reality solutions have become possible. As the entertainment industry has taken the technology eagerly in use, it has also opened several possibilities to develop solutions to enhance and support work processes in industrial and maritime use. In this p...
Conference Paper
Sustainability applications aim at changing behavior to a more sustainable direction ot informing about sustainability. According to our research, information sharing seems to be the key pro-environmental element used in sustainability applications, even though also other elements, such as commitment, comparison, feedback and rewards are often util...
Conference Paper
This paper introduces a variety of virtual and augmented reality solutions for industrial applications. In addition the technologies and techniques required for producing these kind of solutions are presented. The issues studied in research projects referred here include data connectivity, processing and 3D visualization of construction models, pos...
Article
Agile development methods are widely utilized in software development. There is a growing interest and effort to introduce them to other areas of technology, such as development of space systems. Space systems are typically safety-and mission-critical and therefore their development is strongly regulated and standardized. European Cooperation for S...
Conference Paper
In this paper B2C business models for cultural travel mixed reality solutions are analysed through both mobile application and video game business model frameworks. We argue that there are several business models that overlap both traditional application business in mobile ecosystems as well as video gaming and there are quite a few that are not (y...
Conference Paper
In this paper we examine the user experience test results of Augmented Reality Adventure Game designed to Finnish Cultural Heritage Site Luostarinmäki Handicrafts Museum in Turku and discuss about the possible and preferable content, development and economic decisions and guidelines for augmented reality applications for museum and Cultural heritag...
Article
Full-text available
We study in this work piloting agile practices in embedded space system development projects. The case involves three companies acting as last or next to last subcontractors in a space project. Initial interviews and a subsequent survey revealed challenges that embedded space system development poses to the agile software development. These include...
Article
Agile methods are widely utilized in software development but their usage in embedded system development is often limited to software. A case study of three industrial cases was carried out to understand how to tailor agile methods effectively including also hardware development. Agile practices, mostly derived from Scrum, were tailored to fit the...
Technical Report
Full-text available
This literature review aims to clarify what is known about map matching by using inertial sensors and what are the requirements for map matching, inertial sensors, placement and possible complementary position technology. The target is to develop a wearable location system that can position itself within a complex construction environment automatic...
Technical Report
Full-text available
In this paper, we review the advances of monocular model-based tracking for last ten years period until 2014. In 2005, Lepetit, et. al, [19] reviewed the status of monocular model based rigid body tracking. Since then, direct 3D tracking has become quite popular research area, but monocular model-based tracking should still not be forgotten. We mai...
Technical Report
Full-text available
Many industrial applications need object recognition and tracking capabilities. The algorithms developed for those purposes are computationally expensive. Yet ,real time performance, high accuracy and small power consumption are essential measures of the system. When all these requirements are combined, hardware acceleration of these algorithms bec...
Technical Report
Ontology matching is an important task when data from multiple data sources is integrated. Problems of ontology matching have been studied widely in the researchliterature and many different solutions and approaches have been proposed alsoin commercial software tools. In this survey, well-known approaches of ontologymatching, and its subtype schema...
Conference Paper
Power consumption is an important aspect of almost any electrical device design. Near-Threshold Computing (NTC) is a voltage scaling technique that makes it possible to reduce the power consumption of CMOS devices with the cost of speed and reliability. We are using NTC to design low-power cache memory circuit for a low-performance sensor-based sys...
Conference Paper
In the field of IC technologies, there is a constant demand for energy efficiency solutions. Near-Threshold Computing (NTC) is a technique that reduces energy consumption of IC devices, but it also makes them slower. We are applying NTC to a device constructed in 130 nm CMOS technology in the purpose of designing reasonably priced low-power IC devi...
Conference Paper
Agile manifesto with its four values and 12 principles provides widely accepted definition of agile. Agile methods have been actively used in software engineering and other fields are starting to utilize agile development methods as well. Embedded system development combines software, hardware and mechanical engineering activities and thus has some...
Conference Paper
In this paper augmented reality solution development is analysed from an ethical perspective. The paper aims to be a guide on which different aspects of augmented reality and mixed reality development must at least be taken into account when adopting this emerging technology to counter ethically suspicious and malicious consequences which may cause...
Conference Paper
Full-text available
In this paper we describe potential use cases of augmented reality technologies in marine industry. In the two-year research project ongoing at University of Turku we develop a mobile tool which enables visualizing 3D-CAD models and related information onto real environment and accessing data based on location in 3D-CAD model. The tool is designed...
Article
Full-text available
There is a wide area of applications that use embedded systems, and the number of such systems keeps growing. The required functionality and complexity of embedded systems are also constantly increasing, and development of such products is becoming increasingly harder. This requires new thinking on the product development processes, and one such em...
Article
Monitoring services are essential for advanced, reliable NoC systems. They should support traffic management, system reconfiguration and fault detection to enable optimal performance and reliability of the system. The paper presents a thorough description of NoC monitoring structures and studies earlier works. A distributed monitoring structure is...
Conference Paper
Full-text available
AgiES project aims to develop and utilize agile methods for the development of embedded systems covering all of its parts such as electronic hardware, hardware dependent software, and digital integrated circuit design. Agile philosophy is famous in the field of software engineering but rarely used in the development of embedded systems due to the m...
Article
Monitoring services are essential for advanced, reliable NoC systems. They should support traffic management, system reconfiguration and fault detection to enable optimal performance and reliability of the system. The paper presents a thorough description of NoC monitoring structures and studies earlier works. A distributed monitoring structure is...
Article
We present a self-contained adaptive system for detecting and bypassing permanent errors in on-chip interconnects. The proposed system reroutes data on erroneous links to a set of spare wires without interrupting the data flow. To detect permanent errors at runtime, a novel in-line test (ILT) method using spare wires and a test pattern generator is...
Conference Paper
The reliability of networks-on-chip can be increased by developing routing algorithms that provide fault tolerance. Distributed routing algorithms are a class of algorithms where the routing decisions are made without knowledge of the global state of the network. The paper presents a distributed routing algorithm, which targets to maximal fault tol...
Conference Paper
The topology level fault tolerance of network-on-chip (NoC) can be improved with multi network interface (multi-NI) architectures. Multi-NI NoC architectures are based on connecting at least two network interfaces on each core. The aim is to improve fault tolerance on the architectural level which means the delivery of packets even when there are f...
Conference Paper
A significant part of intelligent NoC structures is a network monitoring service which makes possible to observe the status of the network and adapt routing based on it. Two monitoring methods are presented and compared in this paper. These distributed network monitoring methods are based on monitoring the status of the routers and the status of th...
Article
Full-text available
Abstract Network on Chip (NoC) is a new paradigm,to make,the interconnections inside a System on Chip (SoC) system. In traditional solutions interconnections are realized using a bus structure. While integration increase s the bus structure does not meet the needs of the new technology. Bus starts to be narrow and in the worst case it begins to blo...
Article
The amount of errors in future nanoscale technologies is expected to increase dramatically when compared to technologies that have line width larger than 90 nm. In nanoscale CMOS circuits fault tolerance is one of the most important design constraints to sustain system reliability at an acceptable level. We analyze different error correcting coding...
Conference Paper
The paper presents an approach for analyzing and improving fault tolerance aspects in NoC architectures. This is a necessary step to be taken in order to implement reliable systems in future nanoscale technologies. Several NoC architectures and the router structures as well as the network interface needed for them are presented and compared for the...
Article
Full-text available
We propose link structures for NoC that have properties for tolerating efficiently transient, intermittent, and permanent errors. This is a necessary step to be taken in order to implement reliable systems in future nanoscale technologies. The protection against transient errors is realized using Hamming coding and interleaving for error detection...
Article
Full-text available
High-performance long-range NoC link enables efficient implementation of network-on-chip topologies which inherently require high-performance long-distance point-to-point communication such as torus and fat-tree structures. In addition, the performance of other topologies, such as mesh, can be improved by using high-performance link between few sel...
Conference Paper
We introduce fault-tolerant on-chip routing philosophy for two-dimensional meshes. It is an extension to the concept of packet connected circuit, PCC. In order to increase reliability we have designed an automatic rerouting property to a single switch node and added return channel to the communication route. An autonomic routing switch node is mode...
Conference Paper
Full-text available
We present an approach for analysing and improving fault-tolerance aspects in radio architectures. This is a necessary step to be taken in order to implement reliable radio systems in future nanoscale technologies. We present problem formulation, optimisation approach and implementation methodology. We are adding fault tolerance at architecture lev...
Article
Full-text available
We propose link structures for NoC that have properties for tolerating efciently transient, intermittent and perma- nent errors. The protection against transient errors is re- alized using Hamming coding and interleaving for error detection and retransmission as the recovery method. We introduce two approaches for tackling the intermittent and perm...

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Projects (2)
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