Charge Retention in Quantized Energy Levels of Nanocrystals

Understanding charging mechanisms and charge retention dynamics of nanocrystal memory devices is important in optimization of device design. Capacitance spectroscopy on PECVD grown germanium nanocrystals embedded in a silicon oxide matrix was performed. Dynamic measurements of discharge dynamics are carried out. Charge decay is modelled by assuming storage of carriers in the ground states of nanocrystals and that the decay is dominated by direct tunnelling. Discharge rates are calculated using the theoretical model for different nanocrystal sizes and densities and are compared with experimental data. Experimental results agree well with the proposed model and suggest that charge is indeed stored in the quantized energy levels of the nanocrystals.Comment: 10 pages, 5 figure

Construction of a LAN for the Turkish Naval Base

This research discusses the design issues and fundamental techniques of a local area network (LAN). It then constructs and chooses a LAN for the Turkish Naval Base. Three ships and headquarters will have their own PCs, and they need to rapidly and accurately exchange information among them. The thesis examines the issues for designing a LAN and discusses four fundamental technical issues. These are (1) topology, (2) transmission media, (3) access control, and (4) transmission techniques. Finally we introduce PC LANs, and select and recommend a PC LAN broadband system with coaxial cable. Theses. (fr)http://archive.org/details/constructionofla00oylaTurkish Navy author

Arrayed-waveguide-grating light collector for on-chip spectroscopy

We present a novel arrayed-waveguide-grating (AWG) device with improved external (biomedical) signal collection for use in on-chip spectroscopy. The collection efficiency of the device is compared to that of a standard AWG. We also present experimental results on the collection efficiency and size of the collection volume

Optimizing safety and efficacy of catheter ablation procedures

Abstract In this thesis new developments in the field of invasive electrophysiology are studied and discussed. The aim of this work is to find strategies to optimize safety and efficacy of catheter ablation procedures. The most important developments that are studied in this thesis are the magnetic navigation system, the use of contact force sensing catheters and the introduction of new gold-tip ablation catheters. ROBOTICS: In Part I of this thesis we discussed the use of the first available magnetic navigation system. CONTACT FORCE SENSING: In Part II of this thesis the use of contact force sensing catheters is studied. The success of catheter ablation procedures depends on accurate substrate localization, followed by optimal delivery of energy provided by good tissue contact. LESION FORMATION: The introduction of the irrigated-tip RF catheter was a great improvement for invasive electrophysiology and increased success rates for many arrhythmias compared to nonirrigated-tip catheters. FUTURE PERSPECTIVES: In this thesis new developments in the field of invasive electrophysiology are discussed to optimize safety and efficacy of catheter ablation procedures

Benefitting of Turkey from Financial Assistances of the eu: Difficulties and Successes

As a candidate country, Turkey has benefited from the EU Assistance under IPA for theperiod 2007-2013. Number of projects implemented in Turkey was totally 2 312, sofar. It is a fact that applicants (NGOs, Government Institutions, SMEs) face someproblems during the preparing and implementation of the projects. Therefore, theaim of this study is to share experiences of Turkey with other countries, explaindistribution of assistance component by component, and give examples fromsuccessful implications in practice

How Effective are Smart Contract Analysis Tools? Evaluating Smart Contract Static Analysis Tools Using Bug Injection

Security attacks targeting smart contracts have been on the rise, which have led to financial loss and erosion of trust. Therefore, it is important to enable developers to discover security vulnerabilities in smart contracts before deployment. A number of static analysis tools have been developed for finding security bugs in smart contracts. However, despite the numerous bug-finding tools, there is no systematic approach to evaluate the proposed tools and gauge their effectiveness. This paper proposes SolidiFI, an automated and systematic approach for evaluating smart contract static analysis tools. SolidiFI is based on injecting bugs (i.e., code defects) into all potential locations in a smart contract to introduce targeted security vulnerabilities. SolidiFI then checks the generated buggy contract using the static analysis tools, and identifies the bugs that the tools are unable to detect (false-negatives) along with identifying the bugs reported as false-positives. SolidiFI is used to evaluate six widely-used static analysis tools, namely, Oyente, Securify, Mythril, SmartCheck, Manticore and Slither, using a set of 50 contracts injected by 9369 distinct bugs. It finds several instances of bugs that are not detected by the evaluated tools despite their claims of being able to detect such bugs, and all the tools report many false positivesComment: ISSTA 202