This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License(http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.Shipboard equipment in naval ships should be designed to be safe under the shock load. Very high stress due to the shock load can be effectively reduced by the resilient mounts considering the mount capacity and dynamic characteristics. An optimum arrangement of resilient mount installed to absorb the shock energy is addressed to assess the safety of ship structure and shipboard equipment subjected to the shock load. Structural responses are analyzed for both frame structure supporting the shipboard equipment subject to the shock load with and without the resilient mounts. The shock absorbability of the resilient mount is evaluated by the results of structural response analysis; meanwhile, several types of shock analyses considering the arrangement of resilient mounts are carried out and the shock responses are compared to verify the effect of the arrangement. Thereafter, optimum arrangements are obtained by means of Genetic algorithm (GA) considering the different capacities of resilient mount. Stress, deformation and dynamic feature at the frame structure supporting the shipboard equipment under the shock load are also discussed in order to meet the capacity of resilient mount.

In this letter, we present an ultrawideband (UWB)‐embedded multiband planar monopole antenna. The proposed antenna is composed of a chopped semicircular radiator appended with a meander and a folded branch microstrip line. Owing to inclusion of the semicircular radiator, the antenna can have the UWB characteristic. Also, the meander and the folded‐branch microstrip line guarantee low‐frequency bands, including global system for mobile communication, digital communication system, personal communications service (PCS), United States personal communications service (US‐PCS), wideband code division multiple access, bluetooth, and US‐worldwide interoperability for microwave access. A high‐frequency structure simulator was used to analyze the proposed antenna in the design process and to compare the simulation and experimental results. The bandwidth of the proposed antenna was measured for voltage standing wave ration less than 3. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1111–1115, 2014