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| 2. |
- Kundu, Rohon, et al.
(author)
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Public Key Compression and Fast Polynomial Multiplication for NTRU using the Corrected Hybridized NTT-Karatsuba Method
- 2022
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In: Proceedings of the 8th International Conference on Information Systems Security and Privacy. - : SCITEPRESS - Science and Technology Publications. - 9789897585531 ; , s. 145-153
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Conference paper (peer-reviewed)abstract
- NTRU is a lattice-based public-key cryptosystem that has been selected as one of the Round III finalists at the NIST Post-Quantum Cryptography Standardization. Compressing the key sizes to increase efficiency has been a long-standing open question for lattice-based cryptosystems. In this paper we provide a solution to three seemingly opposite demands for NTRU cryptosystem: compress the key size, increase the security level, optimize performance by implementing fast polynomial multiplications. We consider a specific variant of NTRU known as NTRU-NTT. To perform polynomial optimization, we make use of the Number-Theoretic Transformation (NTT) and hybridize it with the Karatsuba Algorithm. Previous work done in providing 2-part Hybridized NTT-Karatsuba Algorithm contained some operational errors in the product expression, which have been detected in this paper. Further, we conjectured the corrected expression and gave a detailed mathematical proof of correctness. In this paper, for the first time, we optimize NTRU-NTT using the corrected Hybridized NTT-Karatsuba Algorithm. The significance of compressing the value of the prime modulus q lies with decreasing the key sizes. We achieve a 128-bit post-quantum security level for a modulus value of 83,969 which is smaller than the previously known modulus value of 1,061,093,377, while keeping n constant at 2048.
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| 3. |
- Kundu, Swagata, et al.
(author)
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3-D Attention-SEV-Net for Segmentation of Post-operative Glioblastoma with Interactive Correction of Over-Segmentation
- 2023
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In: Pattern Recognition and Machine Intelligence, PREMI 2023. - : Springer. - 9783031451690 - 9783031451706 ; , s. 380-387
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Conference paper (peer-reviewed)abstract
- Accurate localization and volumetric quantification of postoperative glioblastoma are of profound importance for clinical applications like post-surgery treatment planning, monitoring of tumor regrowth, and radiotherapy map planning. Manual delineation consumes more time and error prone thus automated 3-D quantification of brain tumors using deep learning algorithms from MRI scans has been used in recent years. The shortcoming with automated segmentation is that it often over-segments or under-segments the tumor regions. An interactive deep-learning tool will enable radiologists to correct the over-segmented and under-segmented voxels. In this paper, we proposed a network named Attention-SEV-Net which outperforms state-of-the-art network architectures. We also developed an interactive graphical user interface, where the initial 3-D segmentation of contrast-enhanced tumor can be interactively corrected to remove falsely detected isolated tumor regions. Attention-SEV-Net is trained with BraTS-2021 training data set and tested on Uppsala University post-operative glioblastoma dataset. The methodology outperformed state-of-the-art networks like U-Net, VNet, Attention U-Net and Residual U-Net. The mean dice score achieved is 0.6682 and the mean Hausdorff distance-95 got is 8.96mm for the Uppsala University dataset.
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| 4. |
- Simonsson, Martin, 1975-
(author)
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Quantification of Radiation Induced DNA Damage Response in Normal Skin Exposed in Clinical Settings
- 2011
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Doctoral thesis (other academic/artistic)abstract
- The structure, function and accessibility of epidermal skin provide aunique opportunity to study the DNA damage response (DDR) of a normaltissue. The in vivo response can be examined in detail, at a molecularlevel, and further associated to the structural changes, observed at atissue level. We collected an extensive skin biopsy material frompatients undergoing fractionated radiotherapy for 5 to 7 weeks. Several end-points inthe DDR pathways were examined before, during and after the treatment. Quantification of DNA double strand break (DSB) signalling focirevealed a hypersensitivity to doses below 0.3Gy. Furthermore, aconsiderable amount of foci persisted between fractions. The low dosehypersensitivity was observed throughout the treatment and was alsoobserved for several key parameters further downstream in the DDR-pathway, such as p21-associated checkpoint activation, apoptosisinduction and reduction in basal keratinocyte density (BKD).Furthermore, for dose fractions above 1.0 Gy, a distinct acceleration inDDR was observed half way into treatment. This was manifested as anaccelerated loss of basal keratinocytes, mirrored by a simultaneousincrease in DSBs and p21 expression. Quantifications of mitotic events revealed a pronounced suppression ofmitosis throughout the treatment which was clearly low dosehypersensitive. Thus, no evidence of accelerated repopulation could beobserved for fraction doses ranging from 0.05 to 2Gy. Our results suggest that the keratinocyte response primarily isdetermined by checkpoints, which leads to pre-mitotic cell elimination by permanent growth arrest and apoptosis. A comparison between the epidermal and dermal sub-compartments revealsa consistent up-regulation of the DDR response during treatment. Adifference was however observed in the recovery phase after treatment,where miR-34a and p21 remain up-regulated in dermis more persistentlythan in epidermis. Our observations suggest that the recovery phaseafter treatment can provide important clues to understand clinicalobservations such as the early and late effects observed in normaltissues during fractionated radiotherapy.
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| 5. |
- Zhou, Ming, et al.
(author)
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Facile Preparation of Hydrophobic Colloidal MFI and CHA Crystals and Oriented Ultra-thin Films
- 2018
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In: Angewandte Chemie International Edition. - : John Wiley & Sons. - 1433-7851 .- 1521-3773. ; 57:34, s. 10966-10970
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Journal article (peer-reviewed)abstract
- We report novel routes for synthesis of defect-free, hydrophobic and monodispersed 10 nm (5 unit cells) thick MFI crystals and 100 nm CHA crystals. The crystals are obtained in high yield and display very high 1-butanol adsorption from aqueous solution. These crystals are assembled in monolayers for the growth of ultra-thin and uniformly oriented films with thicknesses of 36 nm and 330 nm, respectively, using a synthesis gel in the form of a powder. This method is very simple and may open up for industrial preparation of materials with improved performances.
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| 6. |
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| 7. |
- Creaser, Derek, et al.
(author)
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Transient kinetic analysis of the oxidative dehydrogenation of propane
- 1999
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In: Journal of Catalysis. - : Elsevier BV. - 0021-9517 .- 1090-2694. ; 182:1, s. 264-269
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Journal article (peer-reviewed)abstract
- Oxidative dehydrogenation of propane was studied using various transient techniques. Results support a redox mechanism in which propane reduces the catalyst, which is reoxidized by gas-phase oxygen. Only lattice oxygen participates in propene formation. Desorbable oxygen is a major source of poor selectivity, although lattice oxygen also causes total oxidation. Consequently, propene selectivity in the absence of gas-phase O2is superior to co-feed, steady-state selectivity at the same propane conversion. Propene selectivity is further improved by increasing the degree of catalyst reduction.
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| 8. |
- Easterling, K. E., et al.
(author)
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Metallurgical case studies for engineering students
- 1973
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In: Metals and Materials. - 0026-0940. ; 7:10, s. 452-454
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Journal article (peer-reviewed)abstract
- The course described attempts to help engineering students adapt themselves to solving problems typically encountered in the metals industries
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| 9. |
- Saliu, Sokol
(author)
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Definition of instantaneous frequency on real signals
- 2000
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In: European Signal Processing Conference. - 2219-5491. ; 2015-March:March
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Conference paper (peer-reviewed)abstract
- This paper introduces a definition of the instantaneous frequency (IF) on real signals. Basically the definition ωt = xt/√1 - x2t avoids some pitfalls associated with the corresponding definition on analytic signals. It readily applies to the class of monocomponent frequency modulated signals and also accommodates the class of amplitude and frequency modulated signals. An interpretation of the IF is given for the latter and an extension of it to instantaneous parameters is discussed.
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| 10. |
- Bate, Iain, et al.
(author)
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Establishing Timing Requirements and Control Attributes for Control Loops in Real-Time Systems
- 2003
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In: Proceedings 15th Euromicro Conference on Real-Time Systems, 2003.. - 0769519369 ; , s. 121-128
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Conference paper (peer-reviewed)abstract
- Advances in scheduling theory have given designers of control systems greater flexibility over their choice of timing requirements. This could lead to systems becoming more responsive and more maintainable. However, experience has shown that engineers find it difficult to exploit these advantages due to the difficulty in determining the “real” timing requirements of systems and therefore the techniques have delivered less benefit than expected. Part of the reason for this is that the models used by engineers when developing systems do not allow for emergent properties such as timing. This paper presents an approach and framework for addressing the problem of identifying an appropriate and valid set of timing requirements and their corresponding control parameters.
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