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Full-Text Articles in Physical Sciences and Mathematics
Computation Programs Of The Astronomical Vessel Position, Chih-Li Chen, Tsung-Hsuan Hsieh
Computation Programs Of The Astronomical Vessel Position, Chih-Li Chen, Tsung-Hsuan Hsieh
Journal of Marine Science and Technology
In open sea sailing, as opposed to sailing with satellite navigation systems, the astronomical vessel position (AVP) is not limited by military codes. If programs can be developed to solve the AVP directly, drawbacks of current methods for performing marine operations can be greatly improved. Complete AVP computations have two necessary points: compute the observed altitude and compute the AVP for two bodies. Thus, this paper utilizes Matlab® programming language to develop the observed altitude (ObsAltPro) and the AVP by using intercept method (IMPro-2) programs, respectively. Adopting the ObsAltPro can avoid the use of nautical almanacs and directly obtain the …
Generalized Xyz Data Editor Software For Marine Geophysical Survey, Yet-Chung Chang, Ching-Hui Tsai, Shu-Kun Hsu
Generalized Xyz Data Editor Software For Marine Geophysical Survey, Yet-Chung Chang, Ching-Hui Tsai, Shu-Kun Hsu
Journal of Marine Science and Technology
For most marine surveying data processing tasks, such as gravity, magnetic or echo-sounding, to find and eliminate the errors among the raw data is a tedious and time-consuming process. Usually, the Graphical User Interface (GUI) software provided with the data acquisition system is very useful to reduce the manpower requirements and speed up processing. However, each tool typically only displays one specific data type or format. In this paper, a GUI program is designed for general marine geophysical data editing. It allows users to define their own data formats, and thereafter it can recognize the data type automatically according to …
Due-Date Assignment And Optional Maintenance Activity Scheduling Problem With Linear Deterioreting Jobs, Chou-Jung Hsu, Suh-Jenq Yang, Dar-Li Yang
Due-Date Assignment And Optional Maintenance Activity Scheduling Problem With Linear Deterioreting Jobs, Chou-Jung Hsu, Suh-Jenq Yang, Dar-Li Yang
Journal of Marine Science and Technology
The focus of this work is to analyze linear deteriorating jobs in a single-machine scheduling problem with due-date assignment and maintenance activity. The linear deteriorating jobs means its processing time is an increasing function of their starting time. The objective is to minimize the total of earliness, tardiness and due-date cost. To solve the scheduling problem addressed in this work, we have to determine the job sequence, the common due-date, and the location of a maintenance activity. We show that the problem can be solved optimally in O(n2 log n) time.
Numerical Solutions Of Differential-Algebraic Equations And Its Applications In Solving Tppc Problems, He-Sheng Wang, Wei-Lun Jhu, Chee-Fai Yung, Ping-Feng Wang
Numerical Solutions Of Differential-Algebraic Equations And Its Applications In Solving Tppc Problems, He-Sheng Wang, Wei-Lun Jhu, Chee-Fai Yung, Ping-Feng Wang
Journal of Marine Science and Technology
In this paper, we present a numerical method for solving nonlinear differential algebraic equations (DAE’s) based on the backward differential formulas (BDF) and the Pade series. Usefulness of the method is then illustrated by a numerical example, which is concerned with the derivation of the optimal guidance law for spacecraft. This kind of problems is called trajectory-prescribed path control (TPPC) in the literature. We reformulate the problem as a Hamiltonian DAE system (usually with a higher index). After establishing the system of spacecraft dynamics, we can derive the optimal guidance law of the system by the proposed numerical method.