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arXiv 2024年

作者： Koleilat, Taha Asgariandehkordi, Hojat Rivaz, Hassan Xiao, Yiming aDepartment of Electrical and Computer Engineering Concordia University Montreal Quebec Canada bDepartment of Computer Science and Software Engineering Concordia University Montreal Quebec Canada

Segmentation of anatomical structures and pathologies in medical images is essential for modern disease diagnosis, clinical research, and treatment planning. While significant advancements have been made in deep learning-based segmentation techniques, many of these methods still suffer from limitations in data efficiency, generalizability, and interactivity. As a result, developing robust segmentation methods that require fewer labeled datasets remains a critical challenge in medical image analysis. Recently, the introduction of foundation models like CLIP and Segment-Anything-Model (SAM), with robust cross-domain representations, has paved the way for interactive and universal image segmentation. However, further exploration of these models for data-efficient segmentation in medical imaging is an active field of research. In this paper, we introduce MedCLIP-SAMv2, a novel framework that integrates the CLIP and SAM models to perform segmentation on clinical scans using text prompts, in both zero-shot and weakly supervised settings. Our approach includes fine-tuning the BiomedCLIP model with a new Decoupled Hard Negative Noise Contrastive Estimation (DHN-NCE) loss, and leveraging the Multi-modal Information Bottleneck (M2IB) to create visual prompts for generating segmentation masks with SAM in the zero-shot setting. We also investigate using zero-shot segmentation labels in a weakly supervised paradigm to enhance segmentation quality further. Extensive validation across four diverse segmentation tasks and medical imaging modalities (breast tumor ultrasound, brain tumor MRI, lung X-ray, and lung CT) demonstrates the high accuracy of our proposed framework. Our code is available at https://***/HealthX-Lab/MedCLIP-SAMv2. © 2024, CC BY-NC-SA.

关键词： Image segmentation

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Partial Permutations Comparison, Maintenance and Applications

SSRN

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SSRN 2024年

作者： Levy, Avivit Shalom, Braha Riva Porat, Ely aDepartment of Software Engineering Shenkar College Ramat Gan 52526 Israel bDepartment of Computer Science Bar-Ilan University Ramat Gan 5290002 Israel cDepartment of Software Engineering Shenkar College Ramat Gan 52526 Israel

This paper studies partial permutations and their use in algorithmic tasks. A partial permutation over Σ is a bijection πpar: Σ1 -> Σ2 mapping a subset Σ1 of Σ to a subset Σ2 of Σ, where |Σ1| = |Σ2| (|Σ| denotes the size of a set Σ). Intuitively, two partial permutations agree if their mapping pairs do not form conflicts. We formally define this notion enabling a consistent as well as informatively rich comparison between partial permutations. We define the Partial Permutations Agreement problem (PPA), as follows. Given two sets A1, A2 of partial permutations over alphabet Σ, each of size n, output a pair (πi,πj), where πi is in A_1, πj is in A2 and πi agrees with πj, if exists. We study the existence of a data structure for efficiently maintaining a dynamic set of partial permutations enabling to retrieve agreement of partial permutations giving both negative and positive results. As applications we point out: (1) fruitful/futile methods for efficient genes sequences comparison in database, (2) an automatic color transformation data augmentation technique for image processing through neural networks, (3) negatively answer a recently posed open question on the strict parameterized dictionary matching with one gap (PDMOG) problem over general dictionary alphabets. © 2024, The Authors. All rights reserved.

关键词： Mapping

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SimulinkRTM based modeling of a multi global navigation satellite system.

SimulinkRTM based modeling of a multi global navigation sate...

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作者： Mukka, Nagaraju. University of North Texas.bDepartment of Computer Science and Engineering.

学位级别：M.S.

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Reflectance imaging by fiber bundle endoscope: Vertical reconstruction by multipositional illumination

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AIP Conference Proceedings 2016年第1期1709卷

作者： Yoriko Ando Kowa Koida Hirohito Sawahata Takashi Sakurai Mitsuo Natsume Takeshi Kawano Rika Numano aElectronics-Inspired Interdisciplinary Research Institute (EIIRIS) Toyohashi University of Technology 1-1 Hibarigaoka Tempaku-cho Toyohashi 441-8580 Japan bDepartment of Computer Science and Engineering Toyohashi University of Technology Japan cDepartment of Electrical and Electronic Information Engineering Toyohashi University of Technology Japan dJuntendo University 2-1-1 Hongo Bunkyo-ku Tokyo 1 3-8421 Japan eDenkosha 95 Oroshihonn-machi Minami-ku Hamamatsushi 432-8055 Japan fDepartment of Environmental and Life Science Toyohashi University of Technology Japan

Fiber bundles for imaging internal organs with minimum physical damage have been increasingly developed for both basic life sciences and clinical applications. Reflectance imaging is possible using fiber bundles for detecting the intrinsic optical contrast of blood vessels and tissue structure. The placement of an illumination source adjacent to imaging optics causes scattered light from deeper tissue layers to illuminate superficial tissues and results in a reflectance image. However, it does not have focal capacity and lacks depth resolution. In this study, we performed spatial analysis for the vertical reconstruction of in vivo tissues using a multipositional illumination scheme. The observed image corresponded to the “shadow” of a target object. When we manipulated the location of illumination, the shadow moved horizontally depending on the depth of the target. We used this horizontal displacement as a cue and successfully performed the vertical reconstruction of mouse brain blood vessels.

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Estimation of beryllium ground state energy by Monte Carlo simulation

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AIP Conference Proceedings 2015年第1期1660卷

作者： K. M. Ariful Kabir Amal Halder aDepartment of Physical Sciences School of Engineering and Computer Science Independent University Bangladesh (IUB) Dhaka Bangladesh bDepartment of Mathematics University of Dhaka Dhaka Bangladesh

Quantum Monte Carlo method represent a powerful and broadly applicable computational tool for finding very accurate solution of the stationary Schrödinger equation for atoms, molecules, solids and a variety of model systems. Using variational Monte Carlo method we have calculated the ground state energy of the Beryllium atom. Our calculation are based on using a modified four parameters trial wave function which leads to good result comparing with the few parameters trial wave functions presented before. Based on random Numbers we can generate a large sample of electron locations to estimate the ground state energy of Beryllium. Our calculation gives good estimation for the ground state energy of the Beryllium atom comparing with the corresponding exact data.

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A nonlinear interface model applied to masonry structures

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AIP Conference Proceedings 2015年第1期1702卷

作者： Frédéric Lebon Maria Letizia Raffa Raffaella Rizzoni aLMA Aix-Marseille University CNRS UPR7051 Centrale Marseille France bDepartment of Civil Engineering and Computer Science University of Rome Tor Vergata Rome Italy cDepartment of Engineering University of Ferrara Italy

In this paper, a new imperfect interface model is presented. The model includes finite strains, micro-cracks and smooth roughness. The model is consistently derived by coupling a homogenization approach for micro-cracked media and arguments of asymptotic analysis. The model is applied to brick/mortar interfaces. Numerical results are presented.

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Computational time analysis of the numerical solution of 3D electrostatic Poisson’s equation

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AIP Conference Proceedings 2015年第1期1660卷

作者： Shakeel Ahmed Kamboh Jane Labadin Andrew Ragai Henri Rigit Tech Chaw Ling Khuda Bux Amur Muhammad Tayyab Chaudhary aDepartment of Computational Science & Mathematics Faculty of Computer Science & Information Technology Universiti Malaysia Sarawak 94300 Kota Samarahan Sarawak Malaysia bDepartment of Computational Science & Mathematics Faculty of Computer Science & Information Technology Universiti Malaysia Sarawak 94300 Kota Samarahan Sarawak Malaysia cFaculty of Engineering Universiti Malaysia Sarawak 94300 Kota Samarahan Sarawak Malaysia dFaculty of Computer Science & Information Technology Universiti Malaya 50603 Kuala Lumpur Malaysia eDepartment of Mathematics & Statistics Quaid-e-Awam University of Engineering Science & Technology 67480 Nawabshah Sindh Pakistan fFaculty of Computer Science & Information Technology Universiti Malaya 50603 Kuala Lumpur Malaysia

3D Poisson’s equation is solved numerically to simulate the electric potential in a prototype design of electrohydrodynamic (EHD) ion-drag micropump. Finite difference method (FDM) is employed to discretize the governing equation. The system of linear equations resulting from FDM is solved iteratively by using the sequential Jacobi (SJ) and sequential Gauss-Seidel (SGS) methods, simulation results are also compared to examine the difference between the results. The main objective was to analyze the computational time required by both the methods with respect to different grid sizes and parallelize the Jacobi method to reduce the computational time. In common, the SGS method is faster than the SJ method but the data parallelism of Jacobi method may produce good speedup over SGS method. In this study, the feasibility of using parallel Jacobi (PJ) method is attempted in relation to SGS method. MATLAB Parallel/Distributed computing environment is used and a parallel code for SJ method is implemented. It was found that for small grid size the SGS method remains dominant over SJ method and PJ method while for large grid size both the sequential methods may take nearly too much processing time to converge. Yet, the PJ method reduces computational time to some extent for large grid sizes.

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On the common modulus attack into the LUC4,6 cryptosystem

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AIP Conference Proceedings 2015年第1期1660卷

作者： Tze Jin Wong Mohd Rushdan Md Said Mohamed Othman Lee Feng Koo aDepartment of Basic Science & Engineering Faculty of Agriculture & Food Science Univerisiti Putra Malaysia Bintulu Campus 97008 Bintulu Sarawak Malaysia dInstitute for Mathematical Research Universiti Putra Malaysia 43400 Serdang Selangor Malaysia bDepartment of Mathematics Faculty of Science Universiti Putra Malaysia 43400 Serdang Selangor Malaysia cDepartment of Communication & Network Technology Faculty of Computer Science & Information Technology Universiti Putra Malaysia 43400 Serdang Selangor Malaysia

The LUC4,6 cryptosystem is a system analogy with RSA cryptosystem and extended from LUC and LUC3 cryptosystems. The process of encryption and decryption are derived from the fourth order linear recurrence sequence and based on Lucas function. This paper reports an investigation into the common modulus attack on the LUC4,6 cryptosystem. In general, the common modulus attack will be succeeded if the sender sends the plaintext to two users used same RSA-modulus and both of encryption keys of them are relatively prime to each other. However, based on the characteristics of high order Lucas sequence, the LUC4,6 cryptosystem is unattackable

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Good Interpolation Points: Learning from Chebyshev, Fekete, Haar and Lebesgue

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AIP Conference Proceedings 2011年第1期1389卷 1917-1922页

作者： Annie Cuyt B. Ali Ibrahimoglu Irem Yaman aDepartment of Mathematics and Computer Science Universiteit Antwerpen Antwerpen Belgium bDepartment of Mathematical Engineering Yildiz Technical University Istanbul Turkey

The search for sets of good interpolation points is highly motivated by the fact that, due to the finite precision of digital computers, valid results can only be expected when the interpolation problem is well‐conditioned. The conditioning of polynomial interpolation and of rational interpolation with preassigned poles is measured by the respective Lebesgue constants. Here we summarize the main results with respect to the Lebesgue constant for polynomial interpolation and we present the best Lebesgue constants in existence for rational interpolation with preassigned poles. The new results are based on a fairly unknown rational analogue of the Chebyshev orthogonal polynomials. We compare with the results obtained in [1] and [2].

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Deuterium Process to Improve Gate Oxide Integrity in Metal‐Oxide‐Silicon (MOS) Structure

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AIP Conference Proceedings 2011年第1期1399卷 959-960页

作者： Young‐Ho Seo Seung‐Woo Do Yong‐Hyun Lee Jae‐Sung Lee aSchool of Electrical Engineering and Computer Science Kyungpook National University Daegu Korea bDepartment of Information and Communication Engineering Uiduk University Gyeongju Korea

We studied alternative process that deuterium can be delivered to the location we want by an implant process. In our processed MOS structure, deuterium ions were located over the top of gate oxide. A short anneal at forming gas was performed to remove the D‐implantation damage. We have observed that deuterium ions at the gate oxide can definitely improve device's gate dielectric characteristics. Also, we have observed that the energy and dose of ion implantation need to be optimized, not to disturb the impurity distribution near channel area.

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