http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Non-Isolated Unidirectional Three-Port Cuk-Cuk Converter for Fuel Cell/Solar PV Systems
Chandrasekar, Balaji,Chellammal, N.,Nallamothu, Bhargavi The Korean Institute of Power Electronics 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.5
A DC-DC Non-Isolated Three-Port Cuk-Cuk (NI-TPCC) converter for interfacing renewable energy sources (RESs) such as Fuel Cell (FC) and Photovoltaic (PV) energy with a DC load is presented in this paper. It features single-stage power conversion from both of the input ports to the load port. The proposed NI-TPCC converter is designed based on the classical Cuk converter. The operational modes and power flow are analyzed in the continuous conduction mode (CCM), and the relationships among the port voltages are derived. Continuous currents in all three ports with less ripple enhance the performance of a fuel cell and its operating life. Furthermore, the output inductor is shared with both of the input ports, which reduces the number of active and passive components. The effectiveness of the designed NI-TPCC converter has been validated through simulation and experimental results.
Chandrasekar, K.,Paramasivam, B.,Chidambaram, I.A. The Korean Institute of Electrical Engineers 2016 Journal of Electrical Engineering & Technology Vol.11 No.6
This paper proposes various design procedures for computing Power System Ancillary Service Requirement Assessment Indices (PSASRAI) for a Two-Area Thermal Reheat Interconnected Power System (TATRIPS) in a restructured environment. In an interconnected power system, a sudden load perturbation in any area causes the deviation of frequencies of all the areas and also in the tie-line powers. This has to be corrected to ensure the generation and distribution of electric power companies to ensure good quality. A simple Proportional and Integral (PI) controllers have wide usages in controlling the Load Frequency Control (LFC) problems. So the design of the PI controller gains for the restructured power system are obtained using Bacterial Foraging Optimization (BFO) algorithm. From the simulation results, the PSASRAI are calculated based on the settling time and peak over shoot concept of control input deviations of each area for different possible transactions. These Indices are useful for system operator to prepare the power system restoration plans. Moreover, the LFC loop coordinated with Redox Flow Batteries (RFB) has greatly improved the dynamic response and it reduces the control input requirements and to ensure improved PSASRAI, thereby improving the system reliability.
Computational Analysis of Apolipophorin-III in Hyphantria cunea
Chandrasekar R.,Dhanalakshmi R.,Krishnan M.,Kim H. J.,Jeong H. C.,Seo S. J. Korean Society of Sericultural Science 2005 International Journal of Industrial Entomology Vol.10 No.1
Recently a cDNA clone of apoLp-III from Hyphantria cunea was isolated and subjected to computational analysis to compare with other available sequences. Multiple sequence alignments were carried out using the amino acid sequences of apoLp-III from six insects. It was found that the H. cunea apoLp-III has relatively high sequence identities to Spodoptera litura ($69.5\%$), Manduca sexta ($66.8\%$), Galleria mellonella ($65.1\%$), Bombyx mori N4 ($54.3\%$) but less identity to Locusta migratoria ($18.3\%$). The amino acid composition was compared with other insects using EXPASY tools; it shows that alanine (Ala), glutamine (Gln), leucine (Leu) and lysine (Lys) are the major amino acid components of apoLp-III in H. cunea as well as other lepidopterans. Homology modeling performed using PSI-BLAST (PDB template M. sexta) reveals that the apoLp-III molecules consist of five, long amphipathic alpha helical bundles with short loops connecting the helices and shows homology with other insects. Phylogenetic analysis shows that the orthopteran apoLp-III represented by locust was most distantly related to the lepidopteran insects.
Chandrasekar, R.,Manohar, Suganthi L.,Krishnan, M. Korean Society of Applied Entomology 2007 Journal of Asia-Pacific Entomology Vol.10 No.3
In insects, the source of storage protein-1 (SP1) in ovaries has been the subject of controversy for several decades, and both extraovarian and intraovarian synthesized proteins have been implicated. Ovarian SP1 is presumed to contribute towards the chorion formation. The amino acid analysis of SP-1 of A. albistriga revealed that it consists of relatively high methionine content (10.9%) and is female-specific. The paper deals with the intraovarian synthesis and tissue distribution of SP1 in the pupal ovaries of A. albistriga. Northern hybridization analysis clearly demonstrates that the SP1 gene was expressed in the developing follicles, the maximum accumulation of its transcript at vitellogenic stage (day 4-8) during the mid pupal periods. Further, the result of EM studies regarding the localization of this protein in follicular epithelial cells is confirmed by immunogold labeling tracer techniques. A possible role for ovarian SP1 in A. albistriga and its relationship with SP1 synthesis by the fat body is discussed.
Chandrasekar Murugesan,Muniza Bai,Biju Pottakkat,Dharm Prakash Dwivedi,Hemachandren Munuswamy,Pazhanivel Mohan 대한내시경로봇외과학회 2024 Journal of Minimally Invasive Surgery Vol.27 No.1
This article presents a review of the literature on congenital bilio-bronchial fistula (BBF), a rare anomaly characterized by abnormal communication between the bile duct and respiratory tract. Congenital BBF often presents with bilioptysis in early neonates and infants; however, patients with no overt symptoms may occasionally present in adulthood. Our literature search in Medline from 1850 to 2023 revealed 42 reported cases of congenital BBF, primarily managed with thoracotomy and excision of the fistula tract. About one-third of these cases required multiple surgeries due to associated biliary anomalies. The review underscores the importance of diagnostic imaging, including bronchoscopy, in identifying and delineating the extent of the fistula. It also highlights the evolving surgical management, with recent cases showing the efficacy of minimally invasive approaches such as laparoscopy and thoracoscopy. In addition to the literature review, we report a young female patient with a history of recurrent respiratory infections presenting with bilioptysis and extensive left lung damage. Initial management included bronchoscopy-guided glue instillation, left thoracotomy, and pneumonectomy. Following the recurrence of symptoms, the patient was successfully treated with laparoscopic excision of the fistula tract. In recent times, minimally invasive approaches such as laparoscopy and thoracoscopy, with excision of the fistula tract are gaining popularity and have shown good results. We suggest biliary communication being the high-pressure end, tackling it transabdominal may prevent recurrent problems.
Chandrasekar, K.,Ramana, N.V. The Korean Institute of Electrical Engineers 2012 Journal of Electrical Engineering & Technology Vol.7 No.4
In this paper the performance of meta-heuristics algorithms such as GA (Genetic Algorithm), DE (Differential Evolution), PSO (Particle Swarm Optimization) and SA (Simulated Annealing) for the problem of TTC enhancement using FACTS devices are compared. In addition to that in the assessment procedure of TTC two novel techniques are proposed. First the optimization algorithm which is used for TTC enhancement is simultaneously used for assessment of TTC. Second the power flow is done using Broyden - Shamanski method with Sherman - Morrison formula (BSS). The proposed approach is tested on WSCC 9 bus, IEEE 118 bus test systems and the results are compared with the conventional Repeated Power Flow (RPF) using Newton Raphson (NR) method which indicates that the proposed method provides better TTC enhancement and computational efficacy than the conventional procedure.