1,721,550 research outputs found
A mathematical model for ascertaining same ciphertext generated from distinct plaintext in Michael O. Rabin Cryptosystem
No full textI am Md Shamim Hossain Biswas
A systematic study on classical cryptographic cypher in order to design a smallest cipher
No full textThe cryptography is the branch of Cryptology. It is a combination of mathematics and computer Science. It is the study of obscuring information in cyberspace. Cipher is a set of algorithm which comprise of encryption and decryption. The cipher paly important role in modern technology. The technologies involving communication including the Internet, Mobile Phones, Digital Television, and ATM machine rely on cipher in order to maintain security and privacy. Thinking about aforesaid importance of cipher in cryptography, in this article, we have designed a smallest cipher which may be efficient in RFID chips. The smallest cipher has been comprised of five mathematical operation: Exponentiation, Multiplication, Addition, Subtraction and Division based on systematic study of classical cipher. The proposed cipher is a keyless cipher, but it is very efficient in secret information passing
A systematic study on classical cryptographic cypher in order to design a smallest cipher
No full textThe cryptography is the branch of Cryptology. It is a combination of mathematics and computer Science. It is the study of obscuring information in cyberspace. Cipher is a set of algorithm which comprise of encryption and decryption. The cipher paly important role in modern technology. The technologies involving communication including the Internet, Mobile Phones, Digital Television, and ATM machine rely on cipher in order to maintain security and privacy. Thinking about aforesaid importance of cipher in cryptography, in this article, we have designed a smallest cipher which may be efficient in RFID chips. The smallest cipher has been comprised of five mathematical operation: Exponentiation, Multiplication, Addition, Subtraction and Division based on systematic study of classical cipher. The proposed cipher is a keyless cipher, but it is very efficient in secret information passing
Colorizing mechanism of brass surface by femtosecond laser induced microstructures
No full textIn this paper, we exhibit the colorizing of brass surfaces by forming femtosecond laser induced microstructures on the sample surfaces. A variety of single colors such as brown, yellow, green, and black are introduced on brass surfaces by engineering periodic microgratings, microholes, and ring-shaped micropatterns using Single Beam Direct Laser Writing (SBDLW) technique. The color of the micro-structured brass surfaces is certainly dependent on the width, depth, and period of the microstructures. Finally, we explain, in brief, the colorizing mechanism of metals by femtosecond laser induced microstructures. (C) 2012 Elsevier GmbH. All rights reserved
Taxonomic revision of the microleafhopper genus Limassolla Dlabola from Korea (Hemiptrea: Cicadellidae: Typhlocybinae)
No full textHossain, Md. Shamim, Kwon, Jin Hyung, Suh, Sang Jae, Kwon, Yong Jung (2019): Taxonomic revision of the microleafhopper genus Limassolla Dlabola from Korea (Hemiptrea: Cicadellidae: Typhlocybinae). Zootaxa 4603 (3): 549-558, DOI: 10.11646/zootaxa.4603.3.
Taxonomic revision of the microleafhopper genus Ziczacella Anufriev 1970 from Korea (Hemiptera: Cicadellidae: Typhlocybinae)
No full textHossain, Md. Shamim, Kwon, Jin Hyung, Suh, Sang Jae, Kwon, Yong Jung (2019): Taxonomic revision of the microleafhopper genus Ziczacella Anufriev 1970 from Korea (Hemiptera: Cicadellidae: Typhlocybinae). Zootaxa 4571 (3): 363-372, DOI: 10.11646/zootaxa.4571.3.
Two new species and two newly recorded species of the subgenus Empoasca Walsh from Korea (Hemiptera: Cicadellidae: Typhlocybinae)
No full textHossain, Md. Shamim, Kwon, Jin Hyung, Suh, Sang Jae, Kwon, Yong Jung (2019): Two new species and two newly recorded species of the subgenus Empoasca Walsh from Korea (Hemiptera: Cicadellidae: Typhlocybinae). Zootaxa 4652 (2): 340-348, DOI: 10.11646/zootaxa.4652.2.
Image resolution enhancement using improved edge directed interpolation algorithm / Md Shamim Hossain
Get PDFImage resolution enhancement is a process to convert the low-resolution image into high-resolution image. This method is applied in many image processing field. One of the commonly used techniques for image resolution enhancement is interpolation. The results of pixel interpolation can vary significantly depending on the interpolation algorithm. Moreover, the conventional interpolation methods are not efficient to assign accurate interpolation value to the high-resolution edge pixels. Therefore, in this study, we propose an improved edge directed interpolation algorithm, which is able to preserve the sharpness of edges. The proposed method is divided into three main steps: edge pixel filtering; bi-cubic interpolation, and edge directed interpolation. The edge pixels and non-edge pixels are separated by the adaptive edge filtering method. After that bi-cubic interpolation is applied for non-edge pixels. The Lagrange interpolation polynomial is used for bi-cubic interpolation and the average weight of sixteen neighbour pixels are calculated for each high-resolution non-edge pixel. Finally, an improved edge directed interpolation is applied on the edge pixels. The proposed method is tested on the several standard grayscale images and compared with the existing methods. According to the evaluation results, the proposed method provides the highest performance of the subjective and objective quality than the standing edge directed interpolation methods
Taxonomic revision of the microleafhopper genus Naratettix Matsumura (Homoptera: Cicadellidae: Typhlocybinae) from Korea
No full textHossain, Md. Shamim, Kwon, Jin Hyung, Suh, Sang Jae, Kwon, Yong Jung (2019): Taxonomic revision of the microleafhopper genus Naratettix Matsumura (Homoptera: Cicadellidae: Typhlocybinae) from Korea. Zootaxa 4657 (1): 148-158, DOI: 10.11646/zootaxa.4657.1.
-coated boro-aluminosilicate glass by single pulse femtosecond laser irradiation
No full textIn this paper, we report the formation of periodic array of micro/nano-scale holes/voids on the surface of and inside Al2O3-coated boro-aluminosilicate glass by means of single pulse femtosecond laser irradiation. The lowest diameter of the nano-holes printed on the Al2O3 coating reaches down to 700 nm, whereas the lowest diameter of the voids inside the glass was 1.1 μm. The fabricated micro/nano-metric holes and voids show uniformity in size and shape throughout the sample area. We also investigate the surface property of the nanovoids' evolved glass surface. We don't observe any structure on the sample surface, when the voids have been evolved inside the glass sample. In addition, we investigate the formation mechanism of the micro/nano-holes or voids in our double-layer samples. We strongly believe that, the periodic micro/nano-voids array will be useful in fabricating various photonic/optical devices, especially, in spreading light
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