Towards a Cyber-Physical Range for the Integrated Navigation System (INS)

The e-navigation concept was introduced by the IMO to enhance berth-to-berth navigation towards enhancing environmental protection, and safety and security at sea by leveraging technological advancements. Even though a number of e-navigation testbeds including some recognized by the IALA exist, they pertain to parts only of the Integrated Navigation System (INS) concept. Moreover, existing e-navigation and bridge testbeds do not have a cybersecurity testing functionality, therefore they cannot be used for assessing the cybersecurity posture of the INS. With cybersecurity concerns on the rise in the maritime domain, it is important to provide such capability. In this paper we review existing bridge testbeds, IMO regulations, and international standards, to first define a reference architecture for the INS and then to develop design specifications for an INS Cyber-Physical Range, i.e., an INS testbed with cybersecurity testing functionality.

Dual-Band Bandpass Filter With Controllable Stopband Bandwidth

A novel dual-band bandpass filter (BPF) is proposed with independently controllable transmission zeros (TZs) which can realize widely tunable stopband bandwidth (BW). The planar microstrip filter consists of a three-degree L-C ladder lowpass filter loaded with two unsymmetrical shorted stubs which are used to produce different TZs. By tuning the parameters of the two unsymmetrical shorted stubs, the TZs can be independently controlled. Therefore, the BPF has independent controllable center frequencies (CFs), passband bandwidths, and stopband bandwidths between adjacent passbands. All the L-C values in the equivalent circuit of the proposed filter are optimized to fulfill the design specifications. For demonstration, a dual-band BPF is designed. The measured results show good agreement with the simulated ones.

Design Specification for an M-Health Solution to Improve Antenatal Care

Existing research on improving antenatal care—using information and communication technologies and related technology—has focused on mobile phones to support SMS alerts and the implementation of a tool for booking appointments. The SMS alert system is limited in many ways, especially in addressing the conflicts in schedule and time for appointment and visit. Even with the reported tool(s) implemented, activities in the software development process, especially the design specifications, were not correctly followed and documented to justify the solutions proposed. By means of a qualitative research approach, a face-to-face oral interview with both pregnant women and obstetricians and a brainstorming session with the obstetricians were achieved. The chapter approach harnesses course-plotting technology to determine the most suitable obstetrician based on proximity and route with Google Map's aid. The result is presented from both analytical and technical perspectives to prevent and reduce the high rate of maternal and neonatal loss.

Feasibility-Based Design Model For Road Vertical Alignment

Road vertical alignment design is a multi-objective design problem that needs to consider multiple constraints. Intelligent design based on optimization algorithms cannot wholly solve problems, such as multi-objective, uncertainty, and constraint dynamics. The article proposes a model of dynamically transforming design constraints into feasible regions as the design develops, to provide decision information before design actions rather than performing constraint evaluation after the design that reduces the empirical estimation. The design actions are divided into new design actions and modifying design actions, and corresponding feasible regions derived from constraints of design specifications and control elevations are established, respectively. Geometrical equations and program algorithms of feasible regions are described in the graphic environment, which is applied to the vertical alignment design to improve the design efficiency and decision-making level.

Modifikasi Mesin Pengupas Kulit Pinang Kering

Due to the weaknesses of some existing areca peelers, some modifications were made. Modifications were made to the gear stripper, the addition of the inlet funnel, the gear stripper cover, and the exit funnel. The purpose of this modification of the design of the areca nut peeling machine is to make it easier for areca-producing farmers to peel their skin. Engine design specifications, using a 1/2 HP motor with a speed of 1500 rpm, 2-inch, and 10-inch pulleys, and a capacity of 5.16 kg/hour. The result of this modification is stated to be able to perform stripping with a large capacity. This machine is expected to be able to meet the needs of manual areca nut peelers to increase productivity.

The analysis of flutter characteristics based on generalized parameters of eigen modes of vibrations

Flutter numerical analysis of a dynamically scaled model (DSM) of a high aspect ratio wing was performed using experimentally obtained generalized parameters of eigen modes of vibrations. The DSM is made of polymer composite materials and is designed for aeroelastic studies in a high-speed wind tunnel. As a result of the analysis, safe operation conditions (flutter limits) of the DSM were determined. The input data to develop the flutter mathematical model are DSM modal test results, i.e. eigen frequencies, mode shapes, modal damping coefficients, and generalized masses obtained from the experiment. The known methods to determine generalized masses have experimental errors. In this work some of the most practical methods to get generalized masses are used: mechanical loading, quadrature component addition and the complex power method. Errors of the above methods were analyzed, and the most reliable methods were selected for flutter analysis. Comparison was made between the flutter analysis using generalized parameters and a pure theoretical one based on developing the mathematical model from the DSM design specifications. According to the design specifications, the mathematical model utilizes the beam-like schematization of the wing. The analysis was performed for Mach numbers from 0.2 to 0.8 and relative air densities of 0.5, 1, 1.5. Comparison of the two methods showed the difference in critical flutter dynamic pressure no more than 6%, which indicates good prospects of the flutter analysis based on generalized parameters of eigen modes.

Sensor Ball: Modernized Logging

The latest development in the electronics and manufacturing industry has enabled work towards the modernization of oil-field instruments. As a part of this trend, it is the time to invent and design small size oil-field instruments that could be much more practical to handle, easy to use, and less costly. High temperatures and pressures of the downhole environment make it very challenging to design and further develop such downhole instruments. To create such apparatuses, a thorough study of downhole conditions needs to be done upfront. This study will further help to define the design specifications and requirements. By targeting liquid wells in Saudi Arabia, we have overcome the challenges posed by the harsh downhole environment and managed to design and manufacture a hand-held device called ‘Sensor Ball’ and tested it in the field.