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Design and investigation of a shape memory alloy actuated gripper
Krishna Chaitanya, S.,Dhanalakshmi, K. Techno-Press 2014 Smart Structures and Systems, An International Jou Vol.14 No.4
This paper proposes a new design of shape memory alloy (SMA) wire actuated gripper for open mode operation. SMA can generate smooth muscle movements during actuation which make them potentially good contenders in designing grippers. The principle of the shape memory alloy gripper is to convert the linear displacement of the SMA wire actuator into the angular displacement of the gripping jaw. Steady state analysis is performed to design the wire diameter of the bias spring for a known SMA wire. The gripper is designed to open about an angle of $22.5^{\circ}$ when actuated using pulsating electric current from a constant current source. The safe operating power range of the gripper is determined and verified theoretically. Experimental evaluation for the uncontrolled gripper showed a rotation of $19.97^{\circ}$. Forced cooling techniques were employed to speed up the cooling process. The gripper is simple and robust in design (single movable jaw), easy to fabricate, low cost, and exhibits wide handling capabilities like longer object handling time and handling wide sizes of objects with minimum utilization of power since power is required only to grasp and release operations.
( Krishna Chaitanya Sadanala ),( Byung Hwa Jung ),( In Jin Jang ),( Bong Chul Chung ) 한국약제학회 2011 Journal of Pharmaceutical Investigation Vol.41 No.1
Urinary steroid levels were investigated in the treatment of CKD-501, a new anti-diabetic drug candidate. CKD-501 was administered orally at the dosage of 1, 2, 4 mg/day for 7 days to normal men (n=18). Urine was collected before, during and after stopping the drug administration and the urinary level of androgen, estrogen, progestin and corticoids were quantified using GC-MS (gas chromatography-mass spectrometry). Only urinary corticosteroid and an androgen, DHEA levels among all the analyzed steroids, have been found to increase progressively, reaching significant levels on the last day of drug treatment and later declined after the drug treatment is withdrawn. Therefore, it was thought that an increase in the urinary corticoid and DHEA levels could be a characteristic of CKD-501, since it prominently acts on the glucose sensitivity and suppresses the triglyceride levels. In conclusion, it was found that CKD-501, an anti-diabetic drug candidate, affects the glucocorticoid and DHEA levels and it plays a crucial role in glucose homeostasis.
Graphene Nanoplatelets as a Solid Phase Extraction Sorbent for Analysis of Chlorophenols in Water
Krishna Chaitanya Sadanala,정봉철 한국응용생명화학회 2013 Applied Biological Chemistry (Appl Biol Chem) Vol.56 No.6
Graphene nanoplatelets are a novel class of carbon nanostructures. They possess an ultra high surface area, and thus have great potentials for the use as sorbent materials. We herein demonstrate the use of graphene nanoplatelets as an adsorbent material for solid-phase extraction. Surface compositions of graphene nanoplatelets were examined by X-ray photoelectron spectroscopy. Scanning electron and transmission electron microscopies were performed to elucidate the morphology of graphene nanoplatelets. Three chlorophenols, 3-chlorophenol, 4-chlorophenol, and 2,4-dichlorophenols were selected as model analytes and extracted on a graphene nanoplatelets-packed solid-phase extraction cartridge,followed by elution with alkaline methanol. The extracted chlorophenols were identified and quantified by UV-vis spectrophotometer. Under the optimized experimental conditions,good linearity (R2 >0.9969), recovery (95–103%), precision (<12%),and accuracy (<±9%) were achieved. The advantages of graphene nanoplatelets as solid phase extraction adsorbent, such as good reusability and no impact of sorbent drying, have been detailed. The present study proposes a useful method for water sample pretreatment and reveals the potential of graphene nanoplatelets as an excellent sorbent material in analytical processes.
A Novel Dr.KSM Approach for Information Security and Risk Management in Health Care Systems
B.Chaitanya Krishna,Kodukula Subrahmanyam,S.S.N.Anjaneyulu,Tai-hoon Kim 보안공학연구지원센터 2015 International Journal of Bio-Science and Bio-Techn Vol.7 No.4
At Present times, A common person focus on their health issues not only for themselves but also for their family because health is a wealth. In the modern days most of the people are working and they spending 40% to 50% of the income on their health issues not only for themselves but also for their family. By this the rate of population arrival to the Hospitals are increasing day-by-day. So the hospitals have to be reliable towards the patients. The records of the patients and the medication details are to be maintained correctly. There may be many risks in the software that they use. So any health organizations are struggles to display the patient electronically measured health records and what they use medication outside. So every time common people are lose their health information. If the common people know the about their previous health records they reduce their money and take the first aid immediately. In this paper we suggest a new approach to risk assessment for health care systems. As risk assessment is a Qualitative approach, there are no exact techniques to solve such risks. Lack of risk assessment techniques leads to failure in the system and organization as the people don’t find interest to come if once the organization fails in any of the issues. Our new method mainly focuses on the risk management for health care organizations. Today’s health care industry faces a number of emerging risk issues related to health care reform, the shift from fee-for-services to outcomes-based compensation, the use of electronic medical records and the management of human capital. Therefore our method has put forth a Risk management technique for the Risk assessment.
Graphene Nanoplatelets as a Solid Phase Extraction Sorbent for Analysis of Chlorophenols in Water
Sadanala, Krishna Chaitanya,Chung, Bong Chul The Korean Society for Applied Biological Chemistr 2013 Applied Biological Chemistry (Appl Biol Chem) Vol.56 No.6
Graphene nanoplatelets are a novel class of carbon nanostructures. They possess an ultra high surface area, and thus have great potentials for the use as sorbent materials. We herein demonstrate the use of graphene nanoplatelets as an adsorbent material for solid-phase extraction. Surface compositions of graphene nanoplatelets were examined by X-ray photoelectron spectroscopy. Scanning electron and transmission electron microscopies were performed to elucidate the morphology of graphene nanoplatelets. Three chlorophenols, 3-chlorophenol, 4-chlorophenol, and 2,4-dichlorophenols were selected as model analytes and extracted on a graphene nanoplatelets-packed solid-phase extraction cartridge, followed by elution with alkaline methanol. The extracted chlorophenols were identified and quantified by UV-vis spectrophotometer. Under the optimized experimental conditions, good linearity ($R^2$ >0.9969), recovery (95-103%), precision (<12%), and accuracy (< ${\pm}9$%) were achieved. The advantages of graphene nanoplatelets as solid phase extraction adsorbent, such as good reusability and no impact of sorbent drying, have been detailed. The present study proposes a useful method for water sample pretreatment and reveals the potential of graphene nanoplatelets as an excellent sorbent material in analytical processes.
Design and investigation of a shape memory alloy actuated gripper
S. Krishna Chaitanya,K. Dhanalakshmi 국제구조공학회 2014 Smart Structures and Systems, An International Jou Vol.14 No.4
This paper proposes a new design of shape memory alloy (SMA) wire actuated gripper for open mode operation. SMA can generate smooth muscle movements during actuation which make them potentially good contenders in designing grippers. The principle of the shape memory alloy gripper is to convert the linear displacement of the SMA wire actuator into the angular displacement of the gripping jaw. Steady state analysis is performed to design the wire diameter of the bias spring for a known SMA wire. The gripper is designed to open about an angle of 22.5 when actuated using pulsating electric current from a constant current source. The safe operating power range of the gripper is determined and verified theoretically. Experimental evaluation for the uncontrolled gripper showed a rotation of 19.97. Forced cooling techniques were employed to speed up the cooling process. The gripper is simple and robust in design (single movable jaw), easy to fabricate, low cost, and exhibits wide handling capabilities like longer object handling time and handling wide sizes of objects with minimum utilization of power since power is required only to grasp and release operations.
A Dependency analysis for Information Security and Risk Management
B. Chaitanya Krishna,Kodukula Subrahmanyam,Tai-hoon Kim 보안공학연구지원센터 2015 International Journal of Security and Its Applicat Vol.9 No.8
Today major issue in IT Sector is security, now a day in every field software products are using at the same time users are struggles for their information and data security. Normally software engineers developed good software and test the all aspects and deliver to the user but they cannot bother about minuet problems because they think that those problems cannot impact the product output. But in the run time environment those problems create major problems and display the wrong outputs. Software hackers also using these minuet problems hacked the system and spoil the data. There are so many methods are available for information security and risk management but those are not universally accepted methods. In this paper I proposed a novel method for information security and risk management. Using this method to develop application very well and if any hidden mistakes are there in development stage those risks are identified in run time environment and reduce risk and provide security to the data.