Cross-point regions on multiple bit planes for lossless images compression

2011 ◽  
Vol 5 (5) ◽  
pp. 466 ◽  
Author(s):  
T.T. Dang ◽  
S.K. Nguyen ◽  
T.D. Vu ◽  
S. Higuchi
Keyword(s):  
Cross Point ◽  
Bit Planes

scholarly journals Security Analysis and Improvement of an Image Encryption Cryptosystem Based on Bit Plane Extraction and Multi Chaos

Entropy ◽  
2021 ◽  
Vol 23 (5) ◽  
pp. 505
Author(s):  
Shuqin Zhu ◽  
Congxu Zhu
Keyword(s):  
Image Encryption ◽  
Random Sequence ◽  
Security Analysis ◽  
Encryption Algorithm ◽  
Original Algorithm ◽  
Plane Extraction ◽  
Bit Plane ◽  
Bit Planes ◽  
And Diffusion ◽  
Improved Algorithm

This paper analyzes the security of image encryption systems based on bit plane extraction and multi chaos. It includes a bit-level permutation for high, 4-bit planes and bit-wise XOR diffusion, and finds that the key streams in the permutation and diffusion phases are independent of the plaintext image. Therefore, the equivalent diffusion key and the equivalent permutation key can be recovered by the chosen-plaintext attack method, in which only two special plaintext images and their corresponding cipher images are used. The effectiveness and feasibility of the proposed attack algorithm is verified by a MATLAB 2015b simulation. In the experiment, all the key streams in the original algorithm are cracked through two special plaintext images and their corresponding ciphertext images. In addition, an improved algorithm is proposed. In the improved algorithm, the generation of a random sequence is related to ciphertext, which makes the encryption algorithm have the encryption effect of a “one time pad”. The encryption effect of the improved algorithm is better than that of the original encryption algorithm in the aspects of information entropy, ciphertext correlation analysis and ciphertext sensitivity analysis.

scholarly journals Using Blended Project-Based Learning for Students’ Behavioral Intention to Use and Academic Achievement in Higher Education

2021 ◽  
Vol 11 (5) ◽  
pp. 207
Author(s):  
Mahdi Mohammed Alamri
Keyword(s):  
Academic Achievement ◽  
Behavioral Intention ◽  
Self Efficacy ◽  
Project Based Learning ◽  
Perceived Usefulness ◽  
Equation Modeling ◽  
Intention To Use ◽  
Cross Point ◽  
Perceived Enjoyment ◽  
Behavioral Intention To Use

This research focused on the potential of project-based learning and blended learning, which offer a distinctive cross-point in regard to building 21st-century skills in the classroom. Specifically, this research hypothesized that using the BPBL approach has an effect on perceived self-efficacy, perceived enjoyment, perceived usefulness, behavioral intention of using BPBL, and students’ academic achievement. To achieve the research goal, we employed a questionnaire as the main data collection method and dispensed it to 80 students, all of whom use the BPBL approach. The findings were obtained via a quantitative research method, structural equation modeling (SEM). We found a significant relationship between the BPBL approach and perceived self-efficacy, perceived enjoyment, perceived usefulness, behavioral intention of using BPBL, and students’ academic achievement. Therefore, we believe that the BPBL approach enhances students’ behavioral intention to use and academic achievement in a blended project-based learning approach and allows sharing knowledge, information, and discussions. Thus, it is recommended that students use the BPBL approach for educational purposes, and they should also be encouraged to do so through their learning at university level.

scholarly journals Oxygen Extraction Fraction at Maximally Vasodilated Tissue in the Ischemic Brain Estimated from the Regional CO2 Responsiveness Measured by Positron Emission Tomography

1988 ◽  
Vol 8 (2) ◽  
pp. 227-235 ◽  
Author(s):  
Iwao Kanno ◽  
Kazuo Uemura ◽  
Schuichi Higano ◽  
Matsutaro Murakami ◽  
Hidehiro Iida ◽  
...  
Keyword(s):  
Positron Emission Tomography ◽  
Resting State ◽  
Emission Tomography ◽  
Oxygen Extraction Fraction ◽  
Oxygen Extraction ◽  
Cross Point ◽  
Steady State Method ◽  
Extraction Fraction ◽  
Positron Emission ◽  
Vascular Responsiveness

The oxygen extraction fraction (OEF) at maximally vasodilated tissue in patients with chronic cerebrovascular disease was evaluated using positron emission tomography. The vascular responsiveness to changes in PaCO2 was measured by the H215O autoradiographic method. It was correlated with the resting-state OEF, as estimated using the 15O steady-state method. The subjects comprised 15 patients with unilateral or bilateral occlusion and stenosis of the internal carotid artery or middle cerebral artery or moyamoya disease. In hypercapnia, the scattergram between the OEF and the vascular responsiveness to changes in PaCO2 revealed a significant negative correlation in 11 of 19 studies on these patients, and the OEF at the zero cross point of the regression line with a vascular responsiveness of 0 was 0.53 ± 0.08 (n = 11). This OEF in the resting state corresponds to exhaustion of the capacity for vasodilation. The vasodilatory capacity is discussed in relation to the lower limit of autoregulation.

Organic Electrochemical Smart Pixels

2002 ◽  
Vol 736 ◽  
Author(s):  
Peter Andersson ◽  
David Nilsson ◽  
Per-Olof Svensson ◽  
Miaoxiang Chen ◽  
Anna Malmström ◽  
...  
Keyword(s):  
Ion Concentration ◽  
Cross Point ◽  
Electrochemical Transistor ◽  
Smart Pixel ◽  
Smart Pixels ◽  
Operation Characteristics

ABSTRACTAn all-printed organic smart pixel is achieved through the combination of an electrochemical transistor and an electrochromic display cell. Smart pixels of this kind are arranged into a cross-point matrix resulting in an active-addressed display. This type of display has been realized on coated fine paper, operates at voltages less than 2 Volts and exhibits good bistability properties. Here we report on the operation characteristics of electrochemical smart pixels in which the ion concentration of the electrolyte has been varied.

ANALISIS PERMINTAAN BERAS DI SUMATERA UTARA

2020 ◽  
Vol 1 (3) ◽  
Author(s):  
Hasyrul Aziz Harahap
Keyword(s):  
Time Series ◽  
Fixed Effects ◽  
Time Series Data ◽  
Food Prices ◽  
Series Data ◽  
Cross Point ◽  
Social Unrest ◽  
Corn Prices ◽  
North Sumatra ◽  
Global Food

Indonesia is often categorized as low food resilient nation, in the sense vulnerable to social unrest and rising global food prices. Where every year the number of requests or local domestic rice continue to increase along with the increasing number of people. This study aims to look at and determine how much influence the price of rice, corn prices and the number of population and GDP of the demand for rice in North Sumatra. Used in measuring and analyzing time series data (time series) and the cross-point (cross section) of the 25 districts / municipalities in the period from 2005 to 2010. Data analysis using fixed effects (fixed effect). The results showed a significant effect between the price of rice, the population and GDP of the demand for rice in North Sumatra. While corn prices do not influence of the demand for rice in North Sumatra. The magnitude of the effect is shown by the coefficient of independent variables, namely: -5.215489 for the variable price of rice, 13.08473 for the population, 4.736669 for the variable GDP.

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