38 research outputs found
Efficient AES implementations for ARM based platforms
No full textThe Advanced Encryption Standard (AES) contest, started by the U.S. National Institute of Standards and Technology (NIST), saw the Rijndael algorithm as its winner. Although the AES is fully defined in terms of functionality, it requires best exploitation of architectural parameters in order to reach the optimum performance on specific architectures. Our work concentrates on ARM cores widely used in the embedded industry. Most promising implementation choices for the common ARM Instruction Set Architecture (ISA) are identified, and a new implementation for the linear mixing layer is proposed. The performance improvement over current implementations is demonstrated by a case study on the Intel StrongARM SA-1110 Microprocessor. Further improvements based on exploitation of memory hierarchies are also described, and the corresponding performance figures are presented
The Mound with “Mustaches”Atasu-2
No full textThe results of excavations of barrow with “mustaches” at Atasu river (Central Kazakhstan, Karaganda region) are presented in the paper. Barrows with "mustaches" are a little-studied type of ancient monuments. Monuments of this type were dated back to the periods of the Saks, Huns, Türks. More precise definition of their cultural and chronological affiliation is regarded as difficult but important aim. The barrow with "mustaches" Atasu-2 consists of one rounded stone mound and two stone ridges oriented to the east. In 1977, near the mound was found a stone sculpture of the Saka type. Since 2015, investigation at Atasu area were conducted under the leadership of A.Z. Beisenov. Two pits were discovered under the embankment where the iron arrowheads and items of horse harness were found. Details of horse harness are represented by the different tips of the belts plaques, the head piece and the lining of the forward parts of the saddle flanges. The details of the set are made of an alloy of gold and silver in a polychrome style which has analogies in the archaeological sites of the Hunnish time in Eastern Europe. By analogies the complex is dated by the authors of the middle / second half of the 5th century, and is synchronized with the antiquities of the horizon D2 / D3 of the central European chronology of J. Teiral. The presented materials replenish in science a few information on the Hunnish time of Central Kazakhstan
Bili im teknolojileri ö retmenlerinin teknolojik pedagojik alan bilgisi (TPAB) ve hizmet içi e itim durumlar n n incelenmesi
No full textBu ara t rmada, devlet okullar nda görev yapan bili im teknolojileri (BT) ö retmenlerinin teknolojik pedagojik alan bilgisi (TPAB) ve hizmet içi e itim (H E) durumlar incelenmi tir. Ara t rma, nicel ara t rma desenlerinden olan tarama modelleri kapsam nda yer alan ili kisel tarama modeli ile yap lm t r. Ara t rman n çal ma grubunu 2023-2024 e itim ö retim y l nda MEB'e ba l kurumlarda görev 718 BT ö retmeni olu turmaktad r. Ara t rmada veri toplama arac olarak "Demografik Bilgi Toplama Formu", "21. Yüzy l Becerileri Kapsam nda TPAB Ölçe i" ve "H E Kurs Bilgi Formu" kullan lm t r. l milli e itim müdürlükleri arac l ile gönüllü olan ö retmenlere ölçekler iletilmi ve elde edilen dijital veriler do rudan indirilerek IBM SPSS (Statistical Package for the Social Sciences) 22.0 program ile analiz edilmi tir. Ara t rman n analizlerinde Betimsel Analiz, ba ms z örneklem t-testi, ANOVA ve Pearson Korelasyon analizleri kullan lm t r. Ara t rma sonuçlar BT ö retmenlerinin TPAB'lar n n olukça yüksek oldu unu göstermi tir. BT ö retmenlerinin TPAB'lar hizmet süresi ve co rafi bölge de i kenlerine göre anlaml bir farkl l k göstermezken e itim seviyesi de i keninde lisansüstü lehinde, günlük ortalama bilgisayar kullan m de i keninde ise 5 saatten fazla kullananlar lehinde anlaml farkl l k vard r. Cinsiyet de i kenine göre bak ld nda TPAB alt boyutlar ndan Pedagojik Bilgide (PB) ve Pedagojik Alan Bilgisinde (PAB) anlaml bir farkl l k yokken di er tüm alt boyutlarda erkek kat l mc lar lehinde anlaml bir farkl l k tespit edilmi tir. Ya de i keninde ise sadece Alan Bilgisi (AB) alt boyutunda 42 ya üzeri kat l mc lar lehinde anlaml farkl l k ortaya ç km t r. Ayr ca kat l mc lar n H E durumlar ile TPAB'lar aras nda istatistiksel olarak anlaml , pozitif yönlü ve dü ük iddetli bir ili ki bulunmu tur
Taurodontism in association with supernumerary teeth
No full textThe dental, radiological, genetic and dermatoglyphic findings of an additional patient with taurodontism in association with supernumerary teeth were presented and the findings of the patient were compared with those in the literature
Quantization for compact neural passage re-ranking
No full textPassage re-ranking is a fundamental problem in information retrieval, which deals with reordering a small set of passages based on their relevancy to a query. It is a crucial component in various web information systems, such as search engines or question-answering systems. Modern approaches for building re-ranking systems rely on neural language models such as BERT, or its derivatives, to create dense indexes for the target document corpus. While such approaches bring significant performance gains compared to classical lexical re-rankers, they have the disadvantage of increased memory costs.A family of methods that can be used to reduce the memory footprint of a dense index is called vector quantization. Vector quantization algorithms usually rely on a combination of clustering and space manipulation operations to perform a lossy compression of the dense index at the expense of index performance. While vector quantization is widely used for first-stage retrieval, its use in the context of re-ranking is underexplored. To this end, this thesis evaluates the effectiveness of product quantization, a well-known vector quantization method, on single-vector dual-encoders, specifically TCT-ColBERT and Aggretriever. In addition to this, we show how linear interpolation of sparse scores can be leveraged to improve the performance of quantized dense indices with negligible costs to the memory footprint or speed. Last but not least, we propose WolfPQ, a learnable quantization method aimed at further improving quantization for re-ranking by bridging the gap between the objective functions used in training product quantization and re-ranking systems, respectively.Computer Scienc
Manufacturer-remanufacturing vs supplier-remanufacturing in a closed-loop supply chain
No full textRemanufacturing at the component level could be performed by either a manufacturer or a supplier. In this paper, we analyze the performance of manufacturer-remanufacturing and supplier-remanufacturing in a decentralized closed-loop supply chain, and examine their desirability from different stakeholder perspectives. We find that the manufacturer may engage in remanufacturing of used components even if remanufacturing is costlier than traditional manufacturing; given remanufacturing is costlier, the manufacturer may forgo remanufacturing due to a marginal increase in consumer willingness-to-pay for the remanufactured product. If the unit remanufacturing cost is high enough, the manufacturer and consumers prefer manufacturer-remanufacturing, while the supplier and the environment prefer supplier-remanufacturing; otherwise, the manufacturer, the supplier, and consumers prefer supplier-remanufacturing, while the environment׳s preference is contingent on the environmental impact discount for the remanufactured product. Finally, the key findings are distilled into a roadmap to guide the development of remanufacturing
The influence of analyzed leaf fertilizer and nitrogen fertilizer on winter wheat productivity
No full textField experiment was conducted in 2013 atASU Experimental Station.The soil type – IDg8–k (LVg–p–w–cc). Thecombination of K–Leaf and Prolis substantially increased winter wheat grain yield in all fertilization groups. After Spraying winter wheat with foliar fertilizer Pompa the greatest yield increasment compared with the control (1.10 t ha-1) was set when the winter wheat nitrogen fertilization rate was N120. However, after increasing the rates of nitrogen fertilizer, the efficiency of pothasium fertilizer decreased significantly. K-Leaf and Prolis essentially increased the winter wheat ears productivity . Essential increasment of wheat ears productivity was determined in all nitrogen fertilization rate groups. Foliar fertilizer Pompa increased the wheat ears productivity as well. The combination of foliar fertilizers K–Leaf and Prolis, increased the mas of 1000 grains in all experiment variations comparing with the control group. The highest weight of 1000 seeds (37,60 g) was determined after using N180 and adding foliar fertilizer Pompa. The highest increasement in the count of wheat grain was determined after using foliar fertilizer Pompa.Vytauto Didžiojo universitetas / Vytautas Magnus UniversityŽemės ūkio akademija / Agriculture Academ
A case study of the D4R laptop
No full textThe D4R (Design for recycling, repair, refurbishment and reuse) laptop was developed in conjunction with MicroPro Computers (MPC), a Dublin-based computer manufacturer. MPC formed an industrial network with end-of-life information technology (IT) asset management firms, IT refurbishers, component manufacturers and local industries to produce a new design that has created a new use for their wastes, thus turning waste into resources. This has been made possible through: D4R product design features that facilitate integration of by-product materials and components into the manufacturing process; the creation of an industrial network of suppliers and local assembly agencies permitting industrial metabolism of by-product materials and components into state-of-the-art laptop products; and the creation of a resource exchange platform that increases the visibility of by-products to be incorporated in newly manufactured systems. MPC has been able to successfully manufacture a universal shell composed of a motherboard and a six-cell lithium battery, encapsulated in a wooden housing structure. The shell is capable of accepting new laptop system components and also has the ability to integrate various diverse parts and components, and parts and components of different specifications. The proposed manufacturing model illustrates an entirely novel approach to industrial networking in computer manufacturing for the purpose of eliminating waste and creating valuable by-products
