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We have fabricated vertical Schottky rectifiers based on a free-standing GaN substrate and have measured the temperature of the device under operation in situ using micro-Raman spectroscopy. The n-type bulk GaN wafer with 500 lm thickness was prepared using hydride vapor-phase epitaxy. The carrier concentration of the wafer was $2.4 9 10 16 cm À3 . Semitransparent Ni and multilayered Ti/Al/Pt/Au were used to make a Schottky and a full backside ohmic contact, respectively. In this investigation, Raman spectra were collected as a function of the forward power applied to the Schottky diode. A systematic shift and broadening of the Raman E 2 peak were observed as a function of increasing bias. This was caused by device heating due to the increase in current as the forward bias was increased. It was demonstrated that micro-Raman spectroscopy can serve as an excellent in situ diagnostic tool for analyzing thermal characteristics of the GaN Schottky diode. Moreover, the strain caused by the piezoelectric effect was calculated to lead to a shift of the Raman peak at the level of 0.001 cm À1 . This confirmed that the observed Raman peak shift was predominantly produced by a thermal not piezoelectric effect.

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In this paper we introduced the concept of cloud computing with the help of secure multi party computation, secure multi party computation play a very crucial role in the field of distributed database where the number of parties or resources is greater than or equal to two. In secure multi party computation each party will calculate their common function and send to the next party present in the database environments. Secure multi party computation is used to increases the performance and efficiency. Cloud computing is new emerging technology in the field of information and communication technology. Which will use the high speed infrastructure and services provided by the cloud service provider? In this paper we implement and study the concept of the vertical partitioned resource database in the cloud environments. Where every party contains their own private resources and wants to communicate with each other without disclosing their private information to the other resources present in the secure multi party cloud based environment.