Weyl's Conception of the Continuum in a Husserlian Transcendental Perspective

This article attempts to broaden the phenomenologically motivated perspective of H. Weyl's Das Kontinuum (1918) in the hope of elucidating the differences between the intuitive and mathematical continuum and further providing a deeper phenomenological interpretation. It is known that Weyl sought to develop an arithmetically based theory of continuum with the reasoning that one should be based on the naturally accessible domain of natural numbers and on the classical first-order predicate calculus to found a theory of mathematical continuum free of impredicative circularities (such as the standard definition of the least upper bound of a set of real numbers) only to stumble, to cite a key question, in the evident lack of intuitive support for the notion of points of the continuum. In this motivation, I set out to deal from a Husserlian viewpoint with the general notion of points as appearances reducible to individuals of pre-predicative experience in contrast with the notion of an interval of real numbers taken as an abstraction based on the intuition of time-flowing experience. I argue that the notions of points and of real intervals in the above sense are not by essence related to objective temporality and thus their incompatibility in mathematical terms is ultimately due to deeper constituting reasons independently of any causal and spatio-temporal constraints

A Framework for Cross-Platform E-Commerce Website Development for Multiple Devices and Browsers

The aim of this study has been to identify Human- Computer Interaction HCI design methods and techniques for the development of cross-platform e-commerce websites that can be used on multiple devices with different screen sizes and web browsers The findings presented here are based on a theoretical framework consisting of three categorizations composition continuity and consistency The framework was implemented with the aid of a case study and a prototype implementation that adapts to the user context The development of the prototype was based on the evaluation of existing e-commerce websites Identified usability issues were readability and the fact that tasks should be dependent on the user context The overall results of this study are presented as a set of usability guidelines for cross-platform e-commerce which highlight the importance of identifying the users needs as well as the context in which they operate by offering a common set of functionality between devices and using device specific input mechanism

Slope Stability Aspects of the Egnatia Odos Highway Project in Northern Greece

The section near the village of Koumaria of the Egnatia Odos highway included a 300 m long cut and cover structure near the foot of a slope being undercut by a river. The combination of the temporary steep cut slopes and the unfavourable weather conditions with low field shear strengths led to successive slope failures in that area and resulted in a heavily affected profile. As a result the cut and cover structure was abandoned in favour of an open cut and various remedial measures were applied for the rehabilitation of the affected area. In the case of another 140 m long cut and cover of the highway near the village of Peristeri sliding movements took place during the excavation of the temporary cut slopes. Those were controlled using the observational method with a combination of earthworks, drainage and retaining measures which ensured the construction of the cut and cover structure

Optimal H₂/Popov controller design using linear matrix inequalities

Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1996.Includes bibliographical references (p. 97-100).by Carolos Livadas.M.S

A Network-Aware Distributed Membership Protocol for Collaborative Defense

To counteract current trends in network malware, distributed solutions have been developed that harness the power of collaborative end-host sensors. While these systems greatly increase the ability to defend against attack, this comes at the cost of complexity due to the coordination of distributed hosts across the dynamic network. Many previous solutions for distributed membership maintenance are agnostic to network conditions and have high overhead, making them less than ideal in the dynamic enterprise environment. In this work, we propose a network-aware, distributed membership protocol, CLUSTER, which improves the performance of the overlay system by biasing neighbor selection towards beneficial nodes based on multiple system metrics and network social patterns (of devices and their users). We provide an extensible method for aggregating and comparing multiple, possibly unrelated metrics. We demonstrate the effectiveness and utility of our protocol through simulation using real-world data and topologies. As part of our results, we highlight our analysis of node churn statistics, offering a new distribution to accurately model enterprise churn

Time-course changes associated with PA Lumbar Mobilizations on Lumbar and Hamstring Range of Motion:A Randomized Controlled Crossover Trial

Objective: We aimed to compare the post-intervention time-course changes in active knee extension (AKE) and active lumbar flexion (ALF) range of motion in response to unilateral posterior–anterior (UPA) mobilizations of the lumbar spine (L4/5 zygapophyseal). Methods: Twenty-four asymptomatic participants (maleness: 0.58, age [mean ± standard deviation]: 32 ± 8 years, body mass index 25.9 ± 2.6 kg m2) were recruited to a fully controlled crossover trial. Following either the intervention (L4/5 zygapophyseal mobilizations) or control, participants immediately performed the AKE and ALF tests, which were also performed at baseline. Subsequent tests were made at intervals of 5, 10, 15, 20, 25, 30, 45 and 60 min. Results: After adjustment for baseline (mean AKE: 37.2° from full extension, mean ALF: 14.37 cm), sex and age, UPA lumbar mobilizations had a most likely moderate effect on AKE (9.8° closer to full extension; ±1.9) and a likely moderate effect on ALF (1.34 cm; ±90% confidence limits 0.43). The magnitude of the AKE effect became most likely small 20-min posttreatment (5.3; ±1.7) and possibly small/possibly trivial 60-min posttreatment (2.1; ±1.4). For ALF, the magnitude of the effect became most likely small 15-min posttreatment (0.76; ±0.25), possibly small/possibly trivial 25-min posttreatment (0.38; ±0.18) and likely trivial 60-min posttreatment (0.26; ±1.8). Discussion: UPA lumbar mobilizations increased lumbar Range of Motion and hamstring extensibility by a moderate magnitude, with the effect reducing after 10–20-min posttreatment. Clinicians should consider these time-course changes when applying UPA lumbar mobilizations