Reusable Aspect Research Articles

Modeling and performance analysis for security aspects

The problem of effectively designing and analyzing software to realize non-functional requirements is an important research topic. The significant benefits of such work include detecting and removing defects earlier, reducing development time and cost while improving the system’s quality. The Formal Design Analysis Framework (FDAF) is an aspect-oriented approach that supports the design and analysis of multiple non-functional properties for distributed, real-time systems. In this paper, a security attribute, data origin authentication, is defined as a reusable aspect based on its security pattern definition. The FDAF provides a UML extension to weave the security aspect into a UML architecture design. This is accomplished by abstracting Aspect-Oriented Programming concepts join point and advice up to the design level. The FDAF supports the automated translation of a UML architecture design into Rapide [D.C. Luckham, J.J. Kenney, L.M. Augustin, J. Vera, D. Bryan, W. Mann, Specification and analysis of system architecture using Rapide, IEEE Transactions on Software Engineering 21 (4) (1995) 336–354], a formal architecture description language, allowing the simulation of a system’s response time. Thus, the response time of a design with and without the security aspect can be respectively analyzed, and the performance cost of this aspect can be predicted. One of the translation algorithms, which have been implemented in the FDAF tool support, and its proof are presented. The FDAF approach is illustrated using a Domain Name System example.

Stereoselective Nitrile Hydrolysis by Immobilized Whole-Cell Biocatalyst

The present work attempts to deal with the stability and reusability aspect of nitrilase from Alcaligenes faecalis for the production of (R)-(-)-mandelic acid. Four entrapment matrixes were screened to search for a suitable support, and alginate was found to have significant process advantages over its other counterparts. Thermodynamic analysis allowed us to account for decreased enantioselectivity (E) as a result of immobilization. The system was also characterized based on the Thiele modulus (phi). Efficient reusability of the biocatalyst up to 35 batches was achieved by immobilization as compared to 9 batches for free cells, and cross-linking extended it further to 40 batches. Finally, synthetic utility of the immobilized biocatalyst was demonstrated on a preparative scale to produce 640 g of (R)-(-)-mandelic acid with 97% enantiomeric excess (ee).

Ceramic Matrix Composites Life Cycle Testing Under Reusable Launcher Environmental Conditions

This article focuses on the thermal protection system (TPS) and hot structures based on carbon fiber‐reinforced SiC (C/SiC) material, which protects the high thermal‐loaded areas and control surfaces of a reusable launch vehicle (RLV). The goal of the test program is the evaluation of the lifetime of different types of TPS under reusability aspects for RLV application, reflecting the re‐entry environments together with the effect of impacts from low‐speed impact, rain erosion, and hail core impact. The test results of the C/SiC samples with the self‐healing oxidation protection system showed very promising results concerning reusability and lifetime.

Reusability Techniques in Load-Flow Analysis Computer Program

This paper describes the implementation of reusability aspects in producing load-flow analysis software application. The reusability in the algorithm and codes are obtained by applying matrix partitioning approach for Newton method and sequential approach for Fast Decoupled method. The software is built by using component-based development and object oriented programming methodologies. These methodologies made the developed load-flow analysis software flexible for future enhancement. Adding and changing codes and algorithm of the software can be done without affecting much the existing codes and algorithms. By maximizing the reusability aspects, the cost and time of software maintenance for updating can be reduced.

Endoluminal ultrasonography with reusable probe: preliminary results.

Endoluminal ultrasound probes have been disposable, making their regular use costly. We describe the technique and preliminary results of a reusable endoluminal ultrasound probe for examining ureteral anatomy. The 2.4-mm (7.2F) or 3-mm (9F) probe (Olympus, Tokyo) is passed up the ureter after a retrograde ureteropyelogram has been obtained. No intraoperative preparation of the probe is needed. An axial image as little as 1 cm or as much as 10 cm around the ureter can be obtained. Over the last 20 months, 50 procedures using endoluminal ultrasonography were performed in our unit: 36 (72%) for uretero-pelvic junction (UPJ) obstruction, 10 (20%) for upper-tract filling defects, and the remaining 4 (8%) for ureteral strictures. Endoluminal ultrasonography detected crossing vessels at the UPJ in 19 (53%) and a septum in 9 (25%) of the 36 renal units with UPJ obstruction. In eight of the 36 renal units with UPJ obstruction (22%), endopyelotomy was not done because of the presence of crossing vessels. A further 4 renal units (11%) had the direction of the incision modified because of the ultrasound findings. In the cases with upper-tract transitional-cell carcinoma, images correlated well with the nephroureterectomy specimen. The probe had to be replaced twice. This endoluminal ultrasound system produces clear images of the ureteral and periureteral anatomy. The reusable aspect of the probe removes an important obstacle to its common use for evaluating a variety of upper urinary tract abnormalities.

Performance Evaluation of ZOMA Preemptive Deadlock Recovery Mechanism for Wormhole Networks

This paper presents a novel deadlock recovery mechanism for fully adaptive routing in wormhole interconnection networks and its performance evaluation using simula tion madeling. ZOMA is an efficient mechanism that takes advantage of the concept of wormhole switching in terms of low hardware resource requirements. The perfor mance of the new mechanism can match that of other more expensive deadlock-recovery mechanisms, while requir ing lower hardware resources that are not on the critical path of the switching process. The proposed mechanism creates a new category of deadlock recovery techniques that we refer to as preemptive as opposed to the existing progressive and regressive categories. Performance evalu ation of the proposed mechanism against other routing algorithms and deadlock-recovery techniques is accom plished using the object-oriented simulation approach. The simulator, WormSim, was written in Java for various reasons. Most importantly are the modularity, hierarchy, extensibility, reusability, and flexibility aspects.

Multiprocessor system for high-resolution image correlation in real time

In this work, the correlation-based image localization problem is targeted toward implementation for real-time operation on high-resolution images. The main contribution resides in a global approach to the two-dimensional correlation problem which concurrently considers the algorithm, the system architecture, and its implementation. Analyzing and studying the alternatives concerning algorithm specification, VLSI architecture, and system architecture at different levels of the design phase, a scalable multiprocessor system, based on multiple instances of identical modules, is derived which achieves a real-time image correlation performance exceeding that of currently available solutions by an order of magnitude concerning frame-rate and input image resolution. As a result, the relevance of image correlation traditionally limited to the image processing domain is now expanded into applied machine vision applications. Addressing packaging and reusability aspects, an MCM implementation of the relevant system components is presented.

Reusability and adaptability of interactive resources in Web-based educational systems

The production of interactive multimedia content is in most cases an expensive task in terms of time and cost. Hence, optimizing production by exploiting the reusability of interactive multimedia elements is mandatory. Reusability can be triggered by a combination of resuable multimedia components and the appropriate use of metadata to control the components as well as their combination. In this article, we discuss the reusability aspects of interactive multimedia content in web-based learning systems. In contrast to existing approaches, we extend a component-based architecture to build interactive multimedia visualization units with the use of metadata for reusability and customizability. In the three-tier model, the lowest layer of the paradigm corresponds to the programmer (code reusability). The user interface of an educational visualization is located at the top layer where the interaction with the end-user (student) takes place. The educator is located between the top and the bottom layers. This medium layer allows adapting interactive multimedia content according to the needs of the user, applying a predefined set of metadata. The teacher can both adjust the level of explanation and the level of interactivity of an animation, and influence the presentation and the results of the algorithms being illustrated (program reusability). After a theoretical overview, we explain our architecture by giving an example of an application.

Reusable multimedia content in Web based learning systems

We discuss reusability aspects of interactive multimedia content in Web based learning systems. In contrast to existing approaches, we extend a component based architecture to build interactive multimedia visualizations by using metadata for reusability issues. The experiment we conducted shows how to reuse the same visualization in different learning contexts.

Further Studies on the Radiation Dosimetry Characteristics of Thermoluminescent Li2B4O7:Cu Phosphor

This paper describes investigations on the following radiation dosimetric characteristics of Li2B4O7:Cu TLD phosphor: (i) batch to batch variation in TL sensitivity, (ii) spurious luminescence effects, (iii) effects of storage at ambient temperature and humidity, and of pre-irradiation annealing temperature on the TL sensitivity, (iv) dependence of TL sensitivity on the irradiation temperature, (v) reusability aspects, (vi) exposure vs TL response and exposure rate dependence to 253.7 nm UV radiation and (vii) fading of radiation induced TL on exposure to sunlight.