Jaemyung Ahn

An optimal task allocation algorithm based on Particle swarm optimization (PSO) is proposed for cooperative timing missions that require involvement of multiple agents. The optimal solution can be utilized in the centralized operation of multi-agent system as well as a benchmark solution of the decentralized task allocation algorithm. However, the optimal solution requires significant computations because this problem is known as NP-hard. Therefore, PSO-based approach can be an alternative becau

T HE instantaneous impact point (IIP) in launch operations is defined as the touchdown point of a rocket with an assumption of an immediate end of the propelled flight [1–3]. The IIP is very important information to judge whether the flight is normal or not, and it should be continuously monitored during the whole flight so that proper actions be taken in an emergency to protect human life and property. Therefore, the real-time prediction and monitoring of the IIP is one of the key safety requir

Coverage problem has variety of applications such as area allocation for surveillance and reconnaissance of the unmanned aerial vehicles (UAVs), which can be converted into multiple traveling salesmen problem. To formulate the area coverage problem for UAV mission assignment, obstacles in the given area should be considered. In this study, area allocation algorithm is proposed for area coverage problem. Area allocation algorithm consists of area partitioning and area revision. Area partitioning

This paper proposes a fast and accurate algorithm to predict the instantaneous impact point of a rocket. The effects of the atmospheric drag and the gravity perturbation are modeled using the response-surface method. The coefficients of the response-surface models at selected time points are determined before the rocket launch using numerical experiments. During the actual flight, the response-surface models provide the correction terms that can be used to improve the accuracy of the analytic Ke

A product family is a set of products that are derived from common sets of parts, interfaces, and processes, known as the product platform. To reduce development time and procurement and operating costs of product platform-based variants, the product platform can be designed after consideration of several characteristics, such as modularity, flexibility, sustainability, and complexity. In this paper, the product platform is viewed from the perspective of system architecting. The architectural co

ABSTRACT This paper introduces a procedure to assess the credibility of models and simulations (M&S) as a group activity based on NASA ’s new standard for M&S NASA‐STD ‐7009. The Delphi method, which is characterized by iterative surveys with controlled feedback, was selected to implement the assessment. The proposed procedure is expected to address the issues in the M&S assessment related to a high level of required expertise and group decision making. An actual credibility assessme

This paper presents analytic expressions for the time derivatives of a Keplerian instantaneous impact point of a rocket. The derivatives can be obtained by differentiating the series of equations associated with the Keplerian instantaneous impact point of a rocket and are expressed as linear combinations of disturbing acceleration components whose coefficients are functions of the current position and velocity of the rocket. The formulae introduced in this paper have been carefully verified usin

This paper proposes a new approach to solve Lambert’s problem using analytic gradient information. The initial flight-path angle has been selected as an iterator variable, and the gradient of the transfer time with respect to the iterator variable has been derived using conditions for an orbital two-point boundary value problem for update of the flight-path angle at each iteration step. A comprehensive experimental study has been conducted to demonstrate the validity of the proposed algorithm. T