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Function mint model is the international standard method to measure the software size which is one of the most important factors to determine the software development cost. Function point model can successfully be applied only when the detailed specification of users' requirements is available. In the domestic public sector, however, the budgeting for software projects is carried out before the requirements of softwares are specified in detail. Therefore, an efficient function point estimation method is rewired to apply function point model at the early stage of software development projects. The purpose of this paper is to compare various function point estimation methods and analyse their accuracies in domestic software projects. We consider four methods : NESMA model, ISBSG model, the simplified function point model and the backfiring method. The methods are applied to about one hundred of domestic Projects, and their estimation errors are compared. The results can used as a Criterion to select an adequate estimation model for function point counts.
The purpose of this paper is to develop an optical fiber displacement sensor. An optical fiber displacement sensor is based on simple principles. Electrical signal responds to the optical flux change due to the displacement change between a target and a sensor probe. In this paper, the performance of optical fiber displacement sensor has been investigated. Firstly, optical loss has been measured before and after polishing optical fiber endface. Secondly, allowance of optical fiber bending has been tested. Thirdly sensitivity and linear range of the sensor has been found out according to the shape of cross section of optical fiber.
As the information communication technique was advanced, the damage of the electromagnetic waves is increasing. This study describes electromagnetic wave absorption properties according to chemical composition ratio of NiCuZn ferrite, which is used electromagnetic wave absorption and shielding material. The best composition ratio, as best condition of electromagnetic wave absorption properties, was Fe₂0₃ 49.0 mol%, NiO 8.5 mol%, CuO 8.5 mol%, ZnO 34.0 mol%.
A EMI/EMC preventing NiCuZn ferrite is prepared by sintering ferrite type or mixing ferrite powder with resin polymers. This paper describes the research on electromagnetic wave absorbtion and shielding properties by sintering temperature of NiCuZn ferrite. NiCuZn ferrite was made that calcination condition was 900℃ in air atmosphere and powder metallurgy process. The best sintering condition was 1080℃ in air atmosphere sinterability at sinterability thickness of 5mm.
This paper describes the discharge characteristics of nitrogen gas(GN₂) for sphere-plane electrode with variation of temperature(0[℃]~-80[℃]) and gap length(d=1.0, 2.0, 3.0[mm]). Some important results obtained from this study are as follows. ① The breakdown voltage(V_(B)) increases with decreasing the temperature(T). ② The duration time of discharge(t) is longer with the decrease of the temperature(T). ③ The dependency of the temperature for breakdown voltage(V_(B)) increases with increasing the nonuniformity of the gap.
This paper proposes a path planning algorithm for robots searching for goal state with avoiding obstacles among multiple moving robots. Motivated by Coulomb's law regarding repulsive and attractive forces between electrical charges. In conventional method for dynamic path planning by potential field, the distance between robot and moving obstacles is measured to calculate the control force applied to robot for avoiding obstacles. To overcome the demerit of the conventional method which makes the robot the obstacles, the feedback control force that complement this shortcoming consists of not only distance but also velocity between robots and obstacles is proposed.