Seventy four French bean germplasms were evaluated for twenty two quantitative traits to study the genetic variability, heritability and genetic advance during Jan-Feb in G.B. Pant University of Agriculture and Technology, Pantnagar. Significant differences were observed among all genotypes. Higher genotypic and phenotypic coefficient of variability were observed for plant height, seed yield per plant, pod yield per plant, pod yield per hectare, number of pods per cluster, number of pods per plant and 100 seed weight (42.45% and 43.30%, 39.72% and 42.34%, 27.59% and 32.12%, 27.59% and 32.12%, 25.01% and 28.14%, 24.56% and 26.76% and 22.65% and 22.96% respectively). High heritability coupled with high genetic advance over mean were observed for plant height, seed yield per plant, pod yield per plant, pod yield per hectare, number of pods per plant, 100 seed weight, number of pods per cluster, leaf length, single pod weight, pod diameter, pod length, number of pod clusters per plant, leaf width, seed length, number of seeds per pod and seed width (96.34% and 85.73%, 88.03% and 76.77%, 73.80% and 48.83%, 73.80% and 48.83%, 84.20% and 46.42%, 97.34% and 46.04%, 45.78% and 78.96%, 38.88% and 89.58%, 38.21% and 92.70%, 92.69% and 35.45%, 90.13% and 34.48%, 32.47% and 79.39%, 28.03% and 79.60%, 26.92% and 99.04%, 56.27% and 24.85%, and 97.82% and 24.01% respectively) indicate predominance additive gene action. Thus, there is ample scope for improving these characters through direct selection.

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Investigation was carried out to assess genetic diversity through principal component analysis (PCA) and D2 analysis. Twenty four genotypes of bitter gourd were grown in RBD with three replications including two checks (Pant karela-1 and Pant karela-2). Principal component analysis showed that the first Eigen root had maximum of 26.83% variation of total variation, while the first six principal component axes together with explained 84.05% variation, which were used for cluster analysis, suggesting first six principal axes are adequate to explain the variation in reduced dimension. Clustering through D2 analysis revealed maximum inter-cluster distance of 498.80 between clusters IV and V followed by cluster III and V (322.81). Thus the genotypes grouped under cluster V, IV and III may yield maximum heterosis upon hybridization and also create wide variability including transgressive segregants in selfed generations. Bangladesh J. Bot. 51(1): 1-7, 2022 (March)

Since last few years, users have been paying significant attention and interest towards the WiMAX Internet technology because of the salient features i.e. higher data rate, broad coverage, quality of service (QoS), scalability, security, and mobility support to the subscribers. Mobile WiMAX (IEEE 802.16e) supports the handover process and mobility of subscriber stations. WiMAX network security is a vital requirement to increase the reliability and to prevent from the various attacks. Implementation of top level security is highly required to lessen the vulnerabilities. Jamming attack, scrambling attack and water-torture attack are among the most severe threats to the physical layer of mobile WiMAX. This paper presents a collaborative attack model based on the combination of scrambling and water-torture attacks. Analysis of the paper shows that the cooperation of two or more attacks/attackers may be more devastating for the network security.