40 research outputs found
Effects of Parasitics and Interface Traps on Ballistic Nanowire FET in the Ultimate Quantum Capacitance Limit
No full textIn this paper, we focus on the performance of a nanowire field-effect transistor in the ultimate quantum capacitance limit (UQCL) (where only one subband is occupied) in the presence of interface traps (D-it), parasitic capacitance (C-L), and source/drain series resistance (R-s,R-d), using a ballistic transport model and compare the performance with its classical capacitance limit (CCL) counterpart. We discuss four different aspects relevant to the present scenario, namely: 1) gate capacitance; 2) drain-current saturation; 3) subthreshold slope; and 4) scaling performance. To gain physical insights into these effects, we also develop a set of semianalytical equations. The key observations are as follows: 1) A strongly energy-quantized nanowire shows nonmonotonic multiple-peak C-V characteristics due to discrete contributions from individual subbands; 2) the ballistic drain current saturates better in the UQCL than in the CCL, both in the presence and absence of D-it and R-s,R-d; 3) the subthreshold slope does not suffer any relative degradation in the UQCL compared to the CCL, even with Dit and R-s,R-d; 4) the UQCL scaling outperforms the CCL in the ideal condition; and 5) the UQCL scaling is more immune to R-s,R-d, but the presence of D-it and C-L significantly degrades the scaling advantages in the UQCL
Quantitative lifecycle risk analysis of the development of a just-in-time transportation network system
No full textThe automotive manufacturing industry is under financial pressure due to massive cost structure, relatively small scale operation and strong global competition. In order to improve their operational cost efficiency, companies have adopt lean principles in all their manufacturing activities, in particular, just-in-time supply chain. However, a consequence of this policy makes the transportation network from the local supply chain time critical. This paper uses an enterprise system model integrated with a quantitative method to study a manufacturing company's logistics system re-development project. The quantitative risk analysis examines the project's systems engineering management plan to see if it is sufficiently to mitigate risks in design, monitoring and validation of the project's lifecycle processes. The computed risk profile shows a trend of decreasing risk and suggests areas of improvement in the systems engineering plan to ensure greater probability of success. The research assumes a single risk profile for the supply chain. Research is continuing in expanding to more accurate risk profile of the project when partners of the supply chain have individual profiles
Risk analysis of the design of a transportation enterprise network system for time critical manufacturing
No full textThe automotive manufacturing industry is under financial pressure due to massive cost structure, relatively small scale operation and strong global competition. In order to improve their operational cost efficiency, companies have adopted Toyota's lean manufacturing system in all their manufacturing activities. However, as a consequence, this policy makes the transportation network from the local supply chain time critical. This paper uses an enterprise model to study a manufacturing company's logistics system in terms of designing, monitoring and validating of the network efficiency and criticality
Investigating into the risks of forming alliance
No full textMany large and highly complex engineering projects present enormous technical and financial risk to organisations. This is especially true in the defence industry where budgets can potentially run into the billions and the project lifecycle may extend over many years. In frequent cases, such projects are too much for a single organisation to undertake. One option that is becoming ubiquitous within contemporary defence projects is to spread the risk by forming an alliance between several organisations. Unfortunately, forming an alliance between several competing organisations brings its own set of challenges and risks. The operating conditions of the business environment are characterised by frequent changes in products, services, processes, organisations, markets, supply and distribution networks. The partners need to work together as an entity to achieve a goal but the relationships within the alliance are often disrupted by the established practices and culture of the individual companies. This paper starts by examining how risks can multiply when an alliance is formed and what potential impacts these risks have on success. A novel 3PE method for modelling the structure of an alliance with the three elements being product, people, process, and their interactions is proposed within an alliance environment. By examining the relationships among the elements, risks are identified, and the key drivers are exposed. Finally, a case study is presented that focused on risks relating to People and behavioural risks exhibited within an alliance
Enterprise approach to modelling of risks in the project lifecycle of naval aviation asset ship integration
No full textA strategic capability of contemporary naval ships is the ability to launch and recover embarked aircraft such as helicopters in a maritime environment. Such operations are enormously challenging due to deck motion, limited landing space, visibility, ship’s superstructure, etc. This places extreme pressure on the pilot, ship’s crew and the platforms alike, making such shipboard operations the most dangerous of all helicopter flight missions. Therefore, the design and integration of equipment, systems and aids to ensure such operations are done as safely as is practicably possible, presents ship builders, aircraft manufacturers, engineers and pilots with some extremely demanding and complex problems. Major naval ship design/build programmes that include an aviation capability, will inevitably need to engage resources across multiple disciplines that include, but not limited to; engineering, design, logistics, administration, procurement, legal, alliance partners and the customer to manage project risks from the outset. This research highlights the need for a holistic/Systems Engineering approach that recognises risks across the wider ship programme, that can only be managed/resolved by cross-discipline collaboration. This paper presents a novel methodology to elicit risks qualitatively and models the relative risk profile of an aviation project throughout the ship programme lifecycle. The use of an enterprise model based on the three ‘P’ element methodology (3PE): Product, Process, People within an environment has been developed. Furthermore, the research outlines a continuous management and visualisation approach that enables a process of dynamic analysis to both reduce and/or mitigate residual risks progressively throughout the project lifecycle to acceptable levels
A systems approach to life cycle risk prediction for complex engineering projects
No full textIn order to successfully deliver challenging and complex engineering projects, it is essential that an organisation has an in-depth understanding of the technical and commercial risks. Without this knowledge, decisions can fail to address, manage or mitigate potential and residual risks causing cost blowouts, schedule delays and technical failures. This paper presents a new method that both quantifies and models the relative risk profile of a project throughout the project lifecycle. It allows the continued management and visualisation of risks and enables a process of dynamic analysis to both reduce and/or mitigate residual risks progressively to acceptable levels. This research explores the use of an enterprise model based on three elements: product, process and people. These elements interact but are constrained in a business/engineering environment. The elements can be used to develop a ubiquitous set of generic project risks prevalent across complex engineering projects. The method is illustrated by three case studies taken from the defence environment, but, the general theory and method can be applied to non-defence organisations and industries
3D World for Reddit
No full textReddit describes itself as "the front page of the Internet." It is a popular website that aims to help connect people and discover new things. Anybody can join this website, or anonymously browse its more than one million subreddits (discussion boards). The website is designed in a simple fashion; when logged in, users can customize their view, but it is generally laid out as a simple forum website. Our group aims to visually represent the existing Reddit community and give Reddit users a new and fun way to discover content on Reddit. Using the Unity game development engine, we have created a real-time 3D world for Reddit. Subreddits are represented as buildings within a city, and threads are represented as pictures within the building. From this 3D world, users can interact with subreddits and threads by viewing or commenting on them
Creating possibility spaces for the development of circular bioeconomy initiatives
No full textTo help move society towards more sustainable states, policies have been developed in various countries to create a circular bioeconomy (CBE) in biobased sectors such as forestry and agriculture. In operationalizing CBE, initiatives must be created in which feedback loops between life-cycle stages are established to enable a “stock” of resources to be recirculated in the economy. By creating such feedback loops, CBE aims to decouple economic growth from natural resource depletion and degradation. However, few CBE initiatives have been developed. This implementation gap has partly arisen because policies to promote CBE are somewhat theoretical and do not seem to be informed by the practical realities of implementing CBE initiatives on the ground. While CBE policies do not and should not set out detailed implementation plans to address these issues, they do need to better account for how favourable circumstances and contexts can be created for the development of CBE initiatives. In response, this paper critically examines how possibility spaces can be created for the development of CBE initiatives. Assemblage thinking is used in longitudinal case study research focused on a major CBE initiative situated in the south of Sweden: Foodhills. Assemblage thinking is both an approach and method widely used in geography to study how spaces for action such as the construction of CBE initiatives are created. As such, the paper identifies and unpacks multiple issues arising in the development of CBE initiatives on the ground including geographical relations, actor networks and power.</p
Immersive Telepresence and Remote Collaboration using Mobile and Wearable Devices
No full textNo description supplie
