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RISS 인기검색어
- 검색키워드
- 저자 : Pramod Kumar Mishra (검색결과 3 건)
- 무료
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Rahul Dev Mishra,Pramod Kumar Singhal 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.5
Microstrip patch antenna is a low profile antenna which has low gain and narrow bandwidth. In this paper a RMPA at 2.4835 GHz is designed for mounting antenna in exposure system. Exposure system is a chamber made up of wood in which two antennas of same frequency mounted. One antenna is used for radiation while other one for reception. The RMPA designed using CST software with gain of 2.8647 dB. In exposure system animals like rats can be placed for observing effects from Wi-Fi systems. These effects are applicable to humans also. For observing effects gain is not sufficient so there is need of gain enhancement. There are numerous techniques of gain enhancement but I proposed antenna array technique. Antenna array which is a collection of radiating elements are very versatile and synthesize a required pattern that can not be achieved using single element. So here two rectangular patches of same size and frequency connected as an array. The gain of array system is 5.6692 dB. Hence there is 97.89% increase in the gain of RMPA.
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Impact of lymph node staging systems in predicting outcome in patients with ampullary cancer
Sundeep Singh Saluja,Pramod Kumar Mishra,Shashi Kiran,Harsh J. Shah,Sandip Chandrasekar,Mohammed Nayeem,Aditya Sharma,Vaibhav Kumar Varshney 한국간담췌외과학회 2020 Annals of hepato-biliary-pancreatic surgery Vol.24 No.4
Backgrounds/Aims: Lymph node (LN) metastasis though, is a poor prognostic factor for ampullary carcinoma (APC), the impact of Lymph node ratio (LNR) and Logarithm odds of positive lymph node (LODDS) in the long-term survival remains controversial. We evaluated the factors affecting the long-term outcome in APC patients with emphasis on LNR and LODDS. Methods: The prospectively collected data of 198 patients who underwent pancreatoduodenectomy for APC was analyzed after excluding 12 patients for various reasons. Factors affecting Disease specific survival (DSS) and Recurrence free survival (RFS) were analyzed with special reference to LN positivity, LNR and LODDS. Results: Out of 186, 117 (62.9%) patients were alive at a median follow-up of 39.5 months and 72 (38.7%) developed recurrence. The overall 5-year DSS was 59.3% & RFS 54.9%. Univariate analysis showed T-stage, tumor differentiation, perineural invasion, LN positivity, LNR and LODDS was significantly affected DSS and RFS. On multivariate analysis, perineural invasion, LN positivity, LNR and LODDS lost its significance for DSS and RFS. AUC for prediction of DSS and RFS for LNR was 0.654 (p<0.001) & 0.629 (p=0.003) respectively and for LODDS, it was 0.697 (p<0.001) & 0.677 (p=0.001) respectively. Sensitivity and specificity of LNR (0.1) for DSS were 37.7% & 83.8% and for RFS were 36.1% & 83.3%; for LODDS (−1.00), sensitivity and specificity for DSS was 62.3% and 67.5% and for RFS it was 59.7% and 66.7% respectively. Conclusions: LNR and LODDS although independently seem to affect the RFS and DSS, albeit have a low sensitivity and specificity in predicting DSS and RFS.
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Sundeep Singh Saluja,Ajay Kumar,Hari Govind,Vaibhav Kumar Varshney,Rahul Khullar,Pramod Kumar Mishra 한국간담췌외과학회 2020 Annals of hepato-biliary-pancreatic surgery Vol.24 No.2
Backgrounds/Aims: Proximal splenorenal shunt (PSRS) is usually done in symptomatic non-cirrhotic portal fibrosis (NCPF). The outcomes of splenectomy with endotherapy in non-bleeder NCPF patients has not been well studied. We here by aimed to study the post-surgical outcomes on short and long-term basis between PSRS and splenectomy among non-bleeder NCPF patients. Methods: The consecutive non-bleeder NCPF patients whom underwent either splenectomy or PSRS from 2008 to 2016 were enrolled. The patients were followed up post-surgery clinically and biochemical investigations, Doppler ultrasound and upper gastrointestinal endoscopy were done as required. The peri-operative parameters compared were operative time, blood loss, hospital stay and morbidity. The long-term outcome measures compared were incidence of portal hypertension (PHTN) related bleed, change in grade of varices, shunt patency, shunt complications and thrombosis of spleno-portal axis. Results: Among 40 patients with non-bleeder status, 24 underwent splenectomy and 16 underwent PSRS. The baseline characteristics including indication of surgery, biochemical investigations and grade of varices were comparable between PSRS and splenectomy. The peri-operative morbidity was not significantly different between two groups. The median follow up duration was 42 months (12-72 months), the decrement in grade of varices was significantly higher in PSRS group (p=0.03), symptomatic PHTN related UGIB was non-significant between PSRS and splenectomy (p=0.5). In PSRS group, 3 (18.3%) patients had shunt thrombosis (n=1) & encephalopathy (n=2) while in splenectomy group two patients developed thrombosis of splenoportal axis. Conclusions: Splenectomy with endotherapy is alternative to PSRS in non-bleeder NCPF patients with indications for surgery.
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