Data Hiding approach based on Eight-Queens Problem and Pixel Mapping Method

Abhishek Bansal,Sunil Kumar Muttoo,Vinay Kumar 보안공학연구지원센터 2014 International Journal of Signal Processing, Image Vol.7 No.5

A new steganographic algorithm is presented using pixel mapping method based on eight queens and number of ones in pixel intensity value. In our method, we are sequentially selecting 81 pixel blocks to embed message bit. The method works with randomizing the bit selection in the 81 pixel block using eight queens’ solutions. This approach finds relationship between secret message and cover image according to the pixel mapping table. In this paper, we have presented a secure image steganography technique with acceptable levels of imperceptibility and distortion in the cover image. In presenting algorithm, security is considered by the randomize selection of eight queen’s solutions based on a seed value. The presented algorithm not only provides high level security, but also produces high capacity and good imperceptibility. The algorithm has been tested with different image file formats like BMP, TIFF and PNG.

External Determinants of Inflation: The India Experience

Abhishek Kumar ROHIT,D,Tripati RAO 한국유통과학회 2018 KODISA ICBE (International Conference on Business Vol.2018 No.-

This study investigates the role of external factors in determining inflation levels in India from 2000:01 to 2016:12 in a time-varying parameter approach of structural vector autoregressive (TVP-VAR) model. Our analysis of time-variations in the impact of foreign determinants of inflation in India is based on a time-varying parameter approach of structural vector autoregressive (TVP-VAR) model. This model allows for time-variations in both the coefficients and the variance-covariance matrix of theinnovations. We build five TVP-VAR models for each of the five foreign factors to be investigated. These models contain the same set of domestic macroeconomic variables. The foreign factors enter the system of domestic variables, one by one. The structural identification in this TVP-VAR model has been done in the following order. The foreign factors have been ordered as the most exogenous variables in all the models, owing to the small size of the Indian economy as compared to the global factors. We find oil price, commodity price, US monetary policy and global liquidity to be significant in explaining the inflation level in India. Further, we also find their impact to be time-varying which may be impacted by a host of factors.

SOME NEW CLASSES OF HARMONIOUS GRAPHS

KUMAR ABHISHEK 장전수학회 2016 Proceedings of the Jangjeon mathematical society Vol.19 No.2

For a nite graph G of order p and size q, let V (G) and E(G) denote its vertex and edge set respectively. A harmonious labeling of a connected graph G is an injective function λ: V (G) → Zq such that the induced edge function λ* : V (G)→Zq defined as λ*(xy) ≡ [λ(x)+λ(y)]modq for each edge xy ∈ E(G) is a bijection whenever G is not a tree. If G is a tree, exactly one label may be used on two vertices. In this note we report some new classes of harmonious graphs.

3D Printing: It’s Microfluidic Functions and Environmental Impacts

Abhishek Sharma,Jitendra K. Pandey,Surajit Mondal,Amit Kumar Mondal,Soumadeep Baksi,Ravi Kumar Patel,추원식 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.4 No.3

Innovative micro products essential for the utilization of a wide variety of macro subjects have complicated three-dimensional (3D) microstructures in addition to a high aspect ratio. Till date, many micro manufacturing processes have been developed, but a specific class of such processes is applicable for fabrication of true 3D micro assembly. The aptitude to process a broad range of materials and the ability to fabricate functional and geometrically complicated, 3D microstructures provides the additive manufacturing (AM) processes which significant profits over traditional methods, such as lithography-based or micromachining approaches investigated widely in the past. In this paper, 3D micro-AM processes have been classified into three main groups, including scalable micro-AM systems, 3D direct writing, and hybrid processes, and the key processes have been reviewed comprehensively. Principle and recent progress of each 3D micro-AM process have been described, and the advantages and disadvantages of each process have low-cost along with its occupational health safety & environmental issues.

Floating Solar: The 3rd Pillar of the Global PV Industry

Abhishek Kumar,Thomas Reindl 한국신재생에너지학회 2019 AFORE Vol.2019 No.11

Supranuclear oculomotor palsy in cerebral venous sinus thrombosis: a case report

Kumar Bismaya,Sabyasachi Pattanayak,Abhishek Dixit,Abhishek Pathak,Rameshwar Nath Chaurasia,Varun Kumar Singh 대한신경집중치료학회 2021 대한신경집중치료학회지 Vol.14 No.2

BackgroundFor certain ocular movement abnormalities, the exact neuroanatomical localization of the causative lesion is still not defined. Oculomotor apraxia, apraxia of eye opening and closing, and motor impersistence are rarely reported in acute stroke, particularly following venous stroke.Case ReportA 34-year-old man presented with headache, vomiting, focal seizures with bilateral tonic-clonic movements, and altered sensorium. Magnetic resonance imaging revealed bilateral frontal and left parietal hemorrhagic infarcts, and contrast venography revealed superior sagittal sinus thrombosis. The patient received anticoagulant treatment with antiepileptics. On re-examination on day 3, the patient had a rare combination of apraxia of eyelid closure, motor impersistence, and oculomotor apraxia. By Day 10 of admission, all oculomotor abnormalities had subsided.ConclusionTo the best of our knowledge, this is the first report of the combination of oculomotor apraxia and apraxia of eyelid closure with motor impersistence in a patient with cerebral venous sinus thrombosis.

Intraosseous Calcaneal Lipoma with Subtalar Performation through Cystic Degeneration: A Case Report

Abhishek Kumar,Stephanie Stephanie,최준영,장선희,서진수 대한족부족관절학회 2015 대한족부족관절학회지 Vol.19 No.1

Intraosseous lipoma is a benign tumor that originates from proliferating mature lipocytes. It often occurs in the metaphysis of long bones of the lower extremity, and also in the calcaneus, humerus, mandible, sacrum, and rib bones. Frequently, it involutes spontaneously through a process of infarction, calcification, and cyst formation. It can either present as pain, or be asymptomatic and only discovered through an incidental radiological finding. In our case, the patient presented with heel pain. Intraoperatively, it was found that the intraosseous cavity was filled with fat along with an adjacent but separate area of cystic degeneration. There was also a cortical perforation at the cystic lesion which was communicating with the subtalar joint. This cortical breach is most likely the cause of diffuse lateral heel pain experienced by our patient, and such a pathological fracture due to intraosseous lipoma has never been reported

Tensile and fracture characterization using a simplified digital image correlation test set-up

Abhishek Kumar,S. Vishnuvardhan,A. Rama Chandra Murthy,G. Raghava 국제구조공학회 2019 Structural Engineering and Mechanics, An Int'l Jou Vol.69 No.4

Digital image correlation (DIC) is now a popular and extensively used full-field metrology technique. In general, DIC is performed by using a turnkey solution offered by various manufacturers of DIC. In this paper, a simple and economical set-up for DIC is proposed which uses easily accessible digital single-lens reflex (DSLR) camera rather than industrial couple-charged device (CCD) cameras. The paper gives a description of aspects of carrying a DIC experiment which includes experimental set-up, specimen preparation, image acquisition and analysis. The details provided here will be helpful to carry DIC experiments without specialized DIC testing rig. To validate the responses obtained from proposed DIC set-up, tension and fatigue tests on specimens made of IS 2062 Gr. E300 steel are determined. Tensile parameters for a flat specimen and stress intensity factor for an eccentrically-loaded single edge notch tension specimen are evaluated from results of DIC experiment. Results obtained from proposed DIC experiments are compared with those obtained from conventional methods and are found to be in close agreement. It is also noted that the high resolution of DSLR allows the use of proposed approach for fracture characterization which could not be carried out with a typical turnkey DIC solution employing a camera of 2MP resolution.

ARC DIMENSION OF A DIGRAPH

KUMAR ABHISHEK 장전수학회 2016 Proceedings of the Jangjeon mathematical society Vol.19 No.1

The results of Harary, Norman, and Cartwright on pointbases in finite digraphs to point- and arc-bases in infinite digraphs was extended by Acharya et.al, [1] by introducing the notion of arc bases of digraphs as follows, in a digraph D = (X, U), not necessarily finite, an arc (x, y) 2 U is reachable from a vertex u if there exists a directed walk W that originates from u and contains (x, y). A subset S ⊆ X is an arc-reaching set of D if for every arc (x, y) there exists a diwalk W originating at a vertex u ∈ S and containing (x, y) and an arc-basis as a minimal arc-reaching set. One of the main results reported in [1] is that all the arc bases of any finite digraph D have the same cardinality which led to the introduction of the notion of arc-dimension of D, denoted a(D), as the cardinality of an arc basis of D, In this article we establish the upper and lower bounds on a(D) + a(D←), a(D) + a(Dc), and establish some related results.

Influence of imperfectly bonded piezoelectric layer with irregularity on propagation of Love-type wave in a reinforced composite structure

Abhishek Kumar Singh,Mriganka Shekhar Chaki,Bristi Hazra,Shruti Mahto 국제구조공학회 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.62 No.3

The present paper investigates the propagation of Love-type wave in a composite structure comprised of imperfectly bonded piezoelectric layer with lower fiber-reinforced half-space with rectangular shaped irregularity at the common interface. Closed-form expression of phase velocity of Love-type wave propagating in the composite structure has been deduced analytically for electrically open and short conditions. Some special cases of the problem have also been studied. It has been found that the obtained results are in well-agreement to the Classical Love wave equation. Significant effects of various parameters viz. irregularity parameter, flexibility imperfectness parameter and viscoelastic imperfectness parameter associated with complex common interface, dielectric constant and piezoelectric coefficient on phase velocity of Love-type wave has been reported. Numerical computations and graphical illustrations have been carried out to demonstrate the deduced results for various cases. Moreover, comparative study has been performed to unravel the effects of the presence of reinforcement and piezoelectricity in the composite structure and also to analyze the existence of irregularity and imperfectness at the common interface of composite structure in context of the present problem which serves as a salient feature of the present study.