1,721,747 research outputs found
Two new species of the genus Nigrimacula (Orthoptera: Tettigoniidae: Meconematinae) from Yunnan, China
No full textDuan, Yanhao, Guo, Qi, Shi, Fuming (2022): Two new species of the genus Nigrimacula (Orthoptera: Tettigoniidae: Meconematinae) from Yunnan, China. Zootaxa 5154 (5): 577-582, DOI: 10.11646/zootaxa.5154.5.
Chuanicosmetura gen. nov. of the tribe Meconematini (Orthoptera: Tettigoniidae) from southwest China and Chuanicosmetura emarginata (Liu, 2000) comb. nov.
No full textGuo, Qi, Wang, Tao, Shi, Fu-Ming (2021): Chuanicosmetura gen. nov. of the tribe Meconematini (Orthoptera: Tettigoniidae) from southwest China and Chuanicosmetura emarginata (Liu, 2000) comb. nov. Zootaxa 4981 (2): 393-397, DOI: https://doi.org/10.11646/zootaxa.4981.2.1
One new genus and species of the tribe Meconematini (Orthoptera: Tettigoniidae Meconematini) from Yunnan, China
No full textGuo, Qi, Shi, Fu-Ming, Chang, Yan-Lin (2021): One new genus and species of the tribe Meconematini (Orthoptera: Tettigoniidae Meconematini) from Yunnan, China. Zootaxa 5020 (2): 397-400, DOI: https://doi.org/10.11646/zootaxa.5020.2.1
Quan guo qi gong zhi bing zi liao zhong xin bao gao shu.
No full textMode of access: Internet.OSU copy 1 a gift of Dr. Fred Ming-an Wu and Dr. Sandra Jones Wu
FIGURE 2 in Chuanicosmetura gen. nov. of the tribe Meconematini (Orthoptera: Tettigoniidae) from southwest China and Chuanicosmetura emarginata (Liu, 2000) comb. nov.
No full textFIGURE 2. Chuanicosmetura emarginata (Liu, 2020) comb. nov.: A. female from Zhougongshan, Ya'an, Sichuan, B. type specimen. C. subgenital plate of type specimen. D. information of type material, A–C. female.Published as part of Guo, Qi, Wang, Tao & Shi, Fu-Ming, 2021, Chuanicosmetura gen. nov. of the tribe Meconematini (Orthoptera: Tettigoniidae) from southwest China and Chuanicosmetura emarginata (Liu, 2000) comb. nov., pp. 393-397 in Zootaxa 4981 (2) on page 396, DOI: 10.11646/zootaxa.4981.2.11, http://zenodo.org/record/491981
A formal approach to the role mining problem
No full textRole-based access control (RBAC) has become the norm for enforcing security since it has been successfully implemented in various commercial systems. Roles, which are nothing but sets of permissions when semantics are unavailable, represent organizational agents that perform certain job functions within the organization. Role engineering, the process of defining a set of roles and associate permissions to them, is essential before all the benefits of RBAC can be realized. There are two basic approaches towards role engineering: top-down and bottom-up. The key problem with the top-down approach is that it is likely to ignore the existing permissions. In addition, the top-down approach calls for a good understanding among various authorities from different disciplines, which makes role engineering tedious, time consuming and very difficult to implement. In contrast, the bottom-up approach automates the role engineering process especially when business semantics are not available. Also, it starts from the existing permissions and aggregates them into roles. Therefore, role engineering by the bottom-up approach is also referred to as role mining. A number of approaches exist for role mining and majority of them employ clustering techniques or their variants to discover roles. An inherent problem with these approaches is that there is no formal notion of goodness/ interestingness of a role. They present heuristic ways to find a set of candidate roles. While offering justifications for the identified roles, there is no integrative view of the entire set of roles. For insightful bottom-up analysis, we need to define interestingness metrics for roles. The objective of this dissertation research is to formally define a list of role mining problems and find the solutions to solve them.Ph.D.Includes bibliographical referencesIncludes vitaby Qi Gu
Evaluating the Effectiveness of Pre-Retirement Seminars: A Case Study of Progress Energy
No full textGUO, QI. Evaluating the Effectiveness of Pre-Retirement Seminars: A Case Study of Progress Energy. (Under the direction of Melinda Sandler Morrill and Robert Clark.)
This research is based on the data collected from the pre-retirement seminars of Progress Energy during 2008 and 2009. This research verifies the fact that the current employees are lacking of certain knowledge of retirement policies and plans, and the highly evaluated pre-retirement seminars provided by PGN did improve the necessary financial literacy of the attendees. The findings also indicate that the effectiveness of the seminars changed between 2008 and 2009 when the socio-economic and demographic characteristics of the attendees were stable over time. A further discussion on the possible impacts emphasizes on both the external changes brought by economic downturn and the internal changes of the seminars in 2009
LED-Based Luminaire Color Shift Acceleration and Prediction
No full textColor stability is of major concern for LED-based products. Currently, much effort is done on lumen maintenance, and for color shift, no agreed method currently exists, be it from testing or from prediction side. To investigate the physics of color shift, we present experiments of each individual part failure of each individual part that are present in LED-based products. In order to develop a color shift prediction method, it is imperative to investigate the color shift contribution by each individual part. We present a new method to predict color shift on a system level, which we named the view factor approach. We compare this prediction method with experiments on luminaire level to conclude that we have taken satisfactory first steps in the field of color shift predictions for LED-based systems.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Electronic Components, Technology and Material
Statistical Analysis of Lumen Depreciation for LED Packages
No full textCommercial claims for LED-based products in terms of lumen maintenance are fully based on TM-21 extrapolations using LM-80 data. This chapter indicates that there may be a risk in doing this as TM-21 only relies on the behavior of the average LED degradation, instead of taking into account the degradation of all individual LEDs. Therefore, we propose a more profound statistical approach in order to make the appropriate step from TM-21 extrapolation to lumen maintenance on a product level. This is needed as some commercial claims are based on 10 years of warranty and some service bids provide periods of 20–25 years of operation. This chapter reviews the different approaches currently available to perform lumen maintenance extrapolations.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Electronic Components, Technology and Material
The Next Frontier: Reliability of Complex Systems
No full textTraditional lighting is focused on the prevention of hardware failures. With the trend toward controlled and connected systems, other components will start playing an equal role in the reliability of it. Here reliability need to be replaced by availability, and other modeling approaches are to be taken into account. Software reliability can only be covered by growth models, with the Goel-Okumoto as a promising candidate. System prognostics and health management is the next step to service the connected complex systems in the most effective way possible. In this chapter we highlight the next frontiers that will need to be taken in order to move the traditional lighting catastrophic failure thinking into a thinking more toward new ways how system (degraded) functions can fail or be compromised.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Electronic Components, Technology and Material
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