An accurate and convenient method to determine an effective MOSFET channel length is proposed. This method is based on a computer aided evaluation of an intrinsic MOSFET channel resistance without using special test devices. N-channel silicon-gate MOSFETs were fabricated, and the channel length and its range of device to device scatter were evaluated . To define an effective channel, a simple model of the source-drain (S-D) diffusion layer is proposed. This model shows that the expected transition layer resistance between the S-D diffusion layer and the inverted channel layer agrees with the experimental results. The accuracy of this method is also discussed. It is found to be better than 0.1 µm.

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Causes of drain current local variability are analyzed by decomposing into current variability components. Besides V TH and G m components, it is newly found that effects of "current onset" variability caused by channel potential fluctuations largely contribute to the current variability and that G m component is relatively small in the saturation region. It is shown that both V TH and current onset components decreases with reducing channel dopants, indicating that intrinsic channel is very effective to reduce current variability. (Keywords: Current variability, V TH , current onset, and G m ) 978-1-4244-7641-1/10/$26.00 ©2010 IEEE

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Araucarioxylon Kraus is a widely known fossil-genus generally applied to woods similar to that of the extant Araucariaceae. However, since 1905, several researchers have pointed out that this name is an illegitimate junior nomenclatural synonym. At least four generic names are in current use for fossil wood of this type: Agathoxylon Hartig, Araucarioxylon, Dadoxylon Endl. and Dammaroxylon J.Schultze-Motel. This problem of inconsistent nomenclatural application is compounded by the fact that woods of this type represent a wide range of plants including basal pteridosperms, cordaitaleans, glossopterids, primitive conifers, and araucarian conifers, with a fossil record that extends from the Devonian to Holocene. Conservation of Araucarioxylon has been repeatedly suggested but never officially proposed. Since general use is a strong argument for conservation, a poll was conducted amongst fossil wood anatomists in order to canvass current and preferred usage. It was found that the community is divided, with about one-fifth recommending retention of the well-known Araucarioxylon, whereas the majority of others advocated use of the legitimate Agathoxylon. The arguments of the various colleagues who answered the poll are synthesized and discussed. There is clearly little support for conservation of Araucarioxylon. A secondary aspect of the poll tackled the issue as to whether Araucaria-like fossil woods should be either gathered into a unique fossil-genus, or whether two fossil-genera should be recognized, based on the respective presence or absence of axial parenchyma. A majority of colleagues favoured having one fossil-genus only. Agathoxylon can be used legitimately and appears to be the most appropriate name for such woods. However, its original diagnosis must be expanded if those woods lacking axial parenchyma are to be included.