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N. PADMA,MANORANJAN GHOSH,SHASHWATI SEN,R. TEWARI 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.6
Nanocomposites of n-type Zinc Oxide (ZnO) and p-type copper phthalocyanine (CuPc) weresynthesized using solution route and the electrical properties of heterojunctions of ZnO and CuPcin the nanocomposite ¯lm was studied. For comparison, electrical properties of bilayer hetero-junction devices using ZnO nanostructure drop cast ¯lm and thermally evaporated CuPc werealso studied. Recti¯cation ratio (RR) of about 28 and 5.5 was obtained at 4 V for devices withnanocomposite ¯lm and bilayer heterojunctions indicating improved formation of p – n junctioncharacteristics for nanocomposite ¯lms. Values of ideality factor, barrier height at the p – njunction interface and series resistance were estimated using di®erent methods like semilog plots,Cheung and Norde's methods. Ideality factor estimated from semilog plots and Cheung'smethods were found to be higher than unity indicating deviation from ideal diode behavior. Barrier height estimated from di®erent methods was about 0.7 eV. Series resistance measuredusing Cheung and Norde's methods were found to be about 92 K ? and 21 K ? , respectively. Bilayer heterojunction devices exhibited much higher series resistance, ideality factor and barrierheight as estimated using all the above-mentioned methods as compared to the devices withnanocomposite ¯lm. The above results indicate intimate mixing and improved interface betweenZnO and CuPc in the in situ synthesized nanocomposite ¯lm thereby o®ering improved p – njunction characteristics.
Khristo N. Boyadzhiev,H. Gopalkrishna Gadiyar,R. Padma 대한수학회 2008 대한수학회보 Vol.45 No.2
The paper deals with the values at the negative integers ofa certain Dirichlet series related to the Riemann zeta function and withthe expression of these values in terms of Bernoulli numbers.
Boyadzhiev, Khristo N.,Gadiyar, H. Gopalkrishna,Padma, R. Korean Mathematical Society 2008 대한수학회보 Vol.45 No.2
The paper deals with the values at the negative integers of a certain Dirichlet series related to the Riemann zeta function and with the expression of these values in terms of Bernoulli numbers.
Latha, V.L. Padma,Reddy, N. Sudhakar,Babu, A. Suresh International Journal of Computer ScienceNetwork S 2021 International journal of computer science and netw Vol.21 No.12
Now that we're in the big data era, data has taken on a new significance as the storage capacity has exploded from trillion bytes to petabytes at breakneck pace. As the use of cloud computing expands and becomes more commonly accepted, several businesses and institutions are opting to store their requests and data there. Cloud storage's concept of a nearly infinite storage resource pool makes data storage and access scalable and readily available. The majority of them, on the other hand, favour a single cloud because of the simplicity and inexpensive storage costs it offers in the near run. Cloud-based data storage, on the other hand, has concerns such as vendor lock-in, privacy leakage and unavailability. With geographically dispersed cloud storage providers, multicloud storage can alleviate these dangers. One of the key challenges in this storage system is to arrange user data in a cost-effective and high-availability manner. A multicloud storage architecture is given in this study. Next, a multi-objective optimization problem is defined to minimise total costs and maximise data availability at the same time, which can be solved using a technique based on the non-dominated sorting genetic algorithm II (NSGA-II) and obtain a set of non-dominated solutions known as the Pareto-optimal set.. When consumers can't pick from the Pareto-optimal set directly, a method based on Principal Component Analysis (PCA) is presented to find the best answer. To sum it all up, thorough tests based on a variety of real-world cloud storage scenarios have proven that the proposed method performs as expected.