20,130 research outputs found
Particularities of security design for wireless networks in small and medium business (SMB)
No full textSmall businesses often have small budgets, which often means no fulltime IT staff or no possibility to hire a security consultant to set up a wireless LAN properly. This paper tries to develop a methodology for designing security for wireless networks in SMB. There are more security options to choose from, when setting up a wireless network, thus the security features needed for a company must be carefully taken in consideration. The benefits from one security feature must be balanced with the implementation and maintenance cost and with the risk of not getting the security level wanted.security, wireless, communication networks
A T-Systems modern LAN megoldásai
No full textA T-System LAN megoldásainak bemutatása és a szükséges technológiák ismertetése. Kitérve a redundancia protokollok és a terhelés megosztás bemutatására. Majd a dolgozat szakmai része a Quality of Service rövid bemutatásával zárul.MscGazdaságinformatik
Performance and design of full-width RHS X and T joints under brace axial tension and brace bending
No full textWithin the research framework for updating the international design standard ISO 14346 for hollow section joints, this study examines brace failure and chord sidewall failure in full-width rectangular hollow section (RHS) X and T joints under brace axial tension, brace in-plane bending and brace out-of-plane bending. The codified design rules for full-width RHS joints are reviewed, with their limitations highlighted. Design resistance equations for brace failure, based on the modified effective width method, and also for chord sidewall failure, using the modified bearing–buckling method and the Lan–Kuhn method, are then proposed. Up-to-date experimental and numerical results are collated from the literature, which cover a wide range of geometrical parameters, steel grades ranging from S235 to S960, varying weld details, and loading cases of brace axial tension, brace in-plane bending and brace out-of-plane bending. The compiled results are adopted to evaluate the performance of full-width RHS joints and to assess suitability of the proposed design resistance equations. It is shown that weld details can significantly affect the deformation capacity and static strengths of full-width RHS joints. The proposed design resistance equations yield conservative and reliable strength predictions for full-width RHS joints. Welding guidance and user-friendly design rules, in which an extension to include Class 3 cross-sections is included, are suggested for full-width RHS X and T joints.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.Steel & Composite Structure
Rb-Sr Isotopic Study of Andesites from Lu-Tao, Lan-Hsu and Hsiao-Lan-Hsu, Eruption Ages and Isotopic Heterogeneity
No full text[[abstract]]Rb-Sr radiometric ages and initial 87Sr/86Sr ratios have been measured for some volcanic samples erupted near the onset time of collision between the Luzon Arc and the Eurasian Piate at the islets of Lu-Tao, Lan-Hsu, and Hsiao-Lan-Hsu. Four Lu-Tao horn-blende-biotite andesites have ages 9.4, 2.9, 2.3, and 1.1 Ma based on data for coexisting biotite-plagioclase pairs. Two similar samples from Hsiao-Lan-Hsu show younger ages of ≦ 1.0 Ma. These ages are consistent with the K-Ar ages (Richard et al., 1986) but significantly expand the duration of dated magmatic activities. However, distinct isotopic heterogeneities observed in some of the coexisting amphibole separates render the oldest age in suspect. The younger ages imply that the magmatic activities lasted at least until two million years after the beginning of the collision, consistent with that inferred previously for the Coastal Range by paleontological and paleomagnetic means. The initial 87Sr/86Sr for the above six rocks range from 0.70478 to 0.70524 while a pyroxene andesite from Lan-Hsu yields a similar value of 0.70472. Such high ratios are unusual among intra-oceanic arcs. If no substantial exchange with seawater has occurred in the genesis of these andesites then the involvement of continental crustal material is implicated. Since these values are much higher than that reported for the Coastal Range in the northern section of the arc (< 0.7035, Shih, 1973), its Sr isotopic composition seems to be heterogeneous. There is no apparent correlation between the initial ratios and the eruption ages. We also describe our procedure for Rb-Sr isotopic analysis and demonstrate its capability.[[fileno]]2010101010004[[department]]物理
The regulatory, inflammatory, and T cell programming roles of interleukin-2 (IL-2)
No full textSignaling through IL-2 induces the activation of pathways that lead to the proliferation, survival and cytokine production of effector T cells. However, through negative feedback mechanisms, internalization of the IL-2 receptor, induction of activation-induced cell death, and the generation of regulatory T cells, IL-2 also promotes the suppression of inflammatory responses. In regulatory T cells, IL-2 signaling upregulates the expression of FoxP3. Regulatory T cell induction by TGF-beta also requires IL-2. Additionally, pro-inflammatory and pro-survival pathways involving PI3K upon IL-2 stimulation is inhibited by PTEN in regulatory T cells. Importantly, IL-2 signaling is key for the development, expansion and maintenance of regulatory T cells. However, gamma(c) cytokines can replace requirements for IL-2 in regulatory T cells, although not with the same efficacy. The dual roles of IL-2 in inflammation are demonstrated in that mice deficient in both FoxP3 and IL-2 display less severe symptoms compared to FoxP3 deficient mice. Finally, IL-2 not only plays a key role in the induction of effector T cells and regulatory T cells, it also inhibits IL-17 producing T cells. By understanding complex dynamics of IL-2 interactions in the inflammatory response, therapies may be developed or modified for regulating immune related disease
Using handheld pocket computers in a wireless telemedicine system
No full textObjectives: To see if senior emergency nurse practitioners can provide support to
inexperienced ones in a Minor Injuries Unit by using a wireless LAN system of
telemedicine transmitting images to a PDA when they were on duty. In addition,
whether such a system could be sufficiently accurate to make clinical diagnoses with
a high level of diagnostic confidence. This would permit an overall lower grade of
nurse to be employed to manage most of the cases as they arrive with a proportionate
lowering of costs.
Methods: The wireless LAN equipment could roam in the Minor Injuries Unit and
the experienced emergency Nurse practitioners could be at home, shopping or even
at a considerable distance from the centre.
Thirty pictorial images of patients who had been sent to the Review Clinic were
transmitted to a PDA various distances of one to sixteen miles from the centre. Two
senior emergency nurse practitioners viewed the images and opined on the diagnosis,
their degree of confidence in the diagnosis and their opinion of the quality of the
image.
Results: the images of patients were sharp, clear, and of diagnostic quality. The
image quality was only uncertain, as was the level of confidence of the diagnosis if
the patient was very dark skinned.
Conclusions: The wireless LAN system works with a remote PDA in this clinical
situation. However there are question marks over the availability of enough
experienced emergency nurse practitioners to staff a service that provides senior
cover for longer parts of the day and at weekends
Euphorbia motuogensis M. T. Li, X. Z. Lan, H. P. Deng & W. L. Zheng 2021, sp. nov.
No full textEuphorbia motuogensis M. T. Li, X. Z. Lan, H. P. Deng & W. L. Zheng, sp. nov. (Figs. 1–2) Type:— CHINA. Tibet: Motuo, the fourth national survey on Chinese materia medica resources, coniferous forest, meadows; 29°41′46.4″N, 95°32′03.95″E, ca. 2600m a.s.l., 2 July 2016, M. T . Li & X. Z . Lan 542624150702036 LY (holotype SWU). Diagnosis:— Euphorbia motuogensis is similar to Euphorbia sikkimensis, but it differs by its pileous stems, secondary involucral leaves absent, 3 yellow green cyathophylls, margin entire or concave in the middle and five similar glands. Herbs, 20–80 cm tall. Root terete, 20–40 cm × 3–5 mm. Stems single or clustered, 3–7 mm thick, mostly unbranched, pileous. Leaves alternate, all but lowermost uniform in size; stipules absent; petiole very short to almost absent; leaf blade ovate-oblong to elliptic, 3–6 × 1.5–2.5 cm, glabrous, base attenuate-cuneate, margin entire, apex obtuse; midrib prominent on both surfaces, lateral veins slender, lateral veins not reaching margin. Inflorescence a terminal pseudumbel; primary involucral leaves usually one round, 5 pecies, even two rounds, the second round involucral leaves usually 3, green, leaves long elliptic to ovate-elliptic, somewhat unequal, 3–4 × 1.5–2.5 cm, base attenuatecuneate, apex obtuse, primary rays 7 (8), 2–4 cm; secondary involucral leaves absent. Cyathophylls 3, yellow green, broad ovate, 1–1.4 × 1–1.2 cm, margin entire or concave in the middle, base and apex rounded. Cyathium; involucre campanulate, ca. 3.5–5× 5–5.5mm, 5 lobes, rounded; glands 5, rounded, densely pilose on the inside. Male flowers many, most exserted from involucre. Female flower: ovary pedicellate and extended out of cup, smooth, glabrous; styles free, style arms slightly 2-lobed. Capsule globose, ca. 5 × 5 mm, smooth, glabrous. Ovary 3-loculed with parietal placentation. Fl. and fr. Jun.–Oct. Etymology:— The specific epithet refers to Motuo, Tibet, China, the type locality of the new species. Distribution and Habitat:— Euphorbia motuogensis is currently known only from its type locality, i.e. the fourth national survey on Chinese materia medica resources. It grows at coniferous forest and meadows at an elevation of ca. 2600 m a.s.l. Phenology:— Flowering and fruiting were observed in June to October. Additionally specimens examined (paratypes):— CHINA. Tibet: Motuo, M . T. Li, X. Z . Lan 542624150702037 LY (SWU)Published as part of Li, Man-Ting, Lan, Xiao-Zhong, Zuo, You-Wei & Deng, Hong-Ping, 2021, Euphorbia motuogensis (Euphorbiaceae), a new species from Xizang, China, pp. 107-116 in Phytotaxa 527 (2) on page 108, DOI: 10.11646/phytotaxa.527.2.3, http://zenodo.org/record/574442
HIGH PERFORMANCE LAN INTERNETWORK DESIGN.
No full textThe author discusses the requirements of a versatile LAN internetwork design, and proposes a high-performance, fault-tolerant internetwork architecture. The major design goal is to preserve an LAN's characteristics, such as high capacity, low queuing delay, packets in sequence, low error rate, etc. , in the LAN internetworking environment so that high performance is achievable. The new architecture can support both packet and fast circuit switching. It is efficient for various applications with a wide range of channel holding times.</p
An Interactive Tool for Teaching and Learning LAN Design
No full textIt is often difficult to motivate students to learn local area network (LAN) design because many students appear to find the subject rather dry, technical and boring. To overcome this problem the author has developed a software tool (named LAN-Designer) that gives students an interactive learning experience in LAN design concepts. The LAN-Designer is suitable for classroom use in introductory computer networking courses. This chapter describes LAN-Designer and its effectiveness in teaching and learning LAN design. The effectiveness of LAN-designer has been evaluated both formally by students and informally in discussion within the teaching team. The feedback from students indicates that the development and implementation of LAN-Designer were successful. It also discusses the impact of LAN-Designer on student learning and comprehension.</jats:p
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