• Proceedings of the KIEE Conference
• /
• 2005.07d
• /
• pp.2588-2590
• /
• 2005

This paper presents an three dimension attitude of inertial navigation system(INS) for managing a transporter in shipyard by using low-cost inertial sensors. The GPS(Global Positioning System) shade field prevents from receiving information of position through GPS satellites, GIS(Geographic Information System) in shipyard, therefore TNS system plays an important part. This system is composed of tiny low-cost gyroscopes, accelerometers and a magnetic compass, and 3-dimension position is estimated by an indirect Kalman filter using the outputs of these inertial sensors.

• Management & Information Systems Review
• /
• v.19
• /
• pp.17-48
• /
• 2006

While the existing research took approach method that uniformly divided the cultural difference between specific countries into individualism - collectivism in the dimension of comparative culture, this research defines the cultural sense of value of domestic university students and company employees in accordance with horizontalism-verticalism pattern within it to corroboratively define the diverse effects of advertisements of standardization and localization of global enterprises. Researching the difference of cultural sense of value owing to this generation of Korean university students and company employees, Korean university students showed prominent propensity of vertical-individualism value and company employees, propensity of horizontal-collectivism value. Researching comparatively the effect of advertisements for standardization and localization of global enterprises in connection with Korean university students and company employees, it turned out Korean university students prominently prefer localization advertisement in the TV advertisement of global enterprises and company employees, standardization advertisement. Especially, the difference between standardization advertisement and localization advertisement of university students and company employees was very remarkable in trademark attitude and advertisement information rather than advertisement attitude. With respect to model appearing in the advertisement, it turned out university students prefer localization advertisement where domestic models appear and company employees prefer standardization advertisement where foreign models appear.

• Journal of Electrical Engineering and Technology
• /
• v.13 no.5
• /
• pp.2004-2010
• /
• 2018

We propose a small active antenna to receive Global Navigation Satellite System (GNSS) signals, i.e., Global Positioning System (GPS) L1 (1,575MHz) and Russian Global Navigation Satellite System (GLONASS) L1 (1,600 MHz) signals. A two-stage low-noise amplifier (LNA) with more than 27 dB gain is implemented in the bottom layer of a three-layer antenna package. In addition, a hybrid coupler is used to combine signals from pair of proximately coupled orthogonal feeds with $90^{\circ}$ phase difference to achieve the circular polarization (CP) characteristic. Three layers of high permittivity (${\varepsilon}_r=10$) substrates are stacked and effectively integrated to have a small dimension of $64mm{\times}64mm{\times}7.42mm$ (including both circuit and antenna). The reflection coefficient of the fabricated antenna at the target frequency is below -10 dB, the measured antenna gain is above 26 dBic and the measured noise figure is less than 1.4 dB.

• Bulletin of the Korean Mathematical Society
• /
• v.42 no.4
• /
• pp.829-836
• /
• 2005

In this note, we introduce a new proof of the unique-ness and existence of a negatively bounded solution for a parabolic partial differential equation. The uniqueness in particular implies the finiteness of the Fourier spanning dimension of the global attractor and the existence allows a construction of an inertial manifold.

• Communications of the Korean Mathematical Society
• /
• v.21 no.1
• /
• pp.11-16
• /
• 2006

In this article we show that if R is a Noetherian ring with the global dimension at most one, then every S-torsion free R-module T has a divisible envelope of the form $T{\hookrightarrow}S^{-1}T$

• 제어로봇시스템학회:학술대회논문집
• /
• 1989.10a
• /
• pp.700-704
• /
• 1989

A robotic system with a 3-dimensional profile measuring sensor is developed in order to measure the complicated shape of the target body. Due to this 3-dimensional profile measuring sensor, a computer is able to adjust the posture of the robot hand so that complicated global profile of the target body can be recognized after several measurements from the variant directions. In order to enable fast data processing, a digital signal processor and a look-up table is introduced.

• Proceedings of the Computational Structural Engineering Institute Conference
• /
• 2003.04a
• /
• pp.127-133
• /
• 2003

In this study, a problem formulation and solution for design optimization of laminate composite cylindrical beam section is presented. The objective of this research is to determine the optimal dimension of the laminated composite cylindrical beam sections which has the equivalent flexural rigidities to those of the steel cylindrical beam sections. The analytical model is based on the laminate theory and accounts for the material coupling for arbitrary laminate stacking sequence configuration. The outer diameter and thickness of the beam are design variables. The solutions described are found using a global search algorithm, Genetic Algorithms (GA).

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 1994.10a
• /
• pp.847-851
• /
• 1994

Existing CAD systems do not provide the advanced function for systematic checking of design and drafting errors in mechanical drawings. This paper describes a method for systematic checking in mechanical drawings. The checking items are deficiency and redundancy of dimensions, input-errors in dimension figures and symbols, etc. Checking for deficiency and redundancy of global dimensions has been performed applying Graph Theory. This system has been applied to several examples and we have confirmed the feasibility of this design checking method.

• Journal of The Korean Astronomical Society
• /
• v.34 no.4
• /
• pp.317-319
• /
• 2001

The response of the earth's magnetosphere to the variation of the solar wind parameters and Interplanetary magnetic field (IMF) has been stud}ed by using a high-resolution, three-dimension magnetohydrodynamic (MHD) simulation when the WIND data of velocity Vx, plasma density, dynamic pressure, By and Bz every 1 minute were used as input. Large electrojet and magnetic storm which occurred on October 21 and 22 are reproduced in the simulation (fig. 1). We have studied the energy transfer and tail reconnect ion in association with geomagnetic storms.

• Journal of the Chungcheong Mathematical Society
• /
• v.7 no.1
• /
• pp.53-58
• /
• 1994

In this note, we study conditions under which SF-rings are semi-simple. We prove that left SF-rings are semisimple for each of the following classes of rings: (1) left non-singular rings of finite rank; (2) rings whose maximal left ideals are finitely generated; (3) rings of pure global dimension zero and (4) rings which is pure-split. Also it is shown that left SF-rings without zero-divisors are semisimple.