• Proceedings of the KIEE Conference
• /
• 2008.07a
• /
• pp.1535-1536
• /
• 2008

GPS/INS/지자기 컴파스 통합 항법 시스템에서 지자기 컴파스의 이상 검출 방법을 제안하였다. 지자기 컴파스의 이상은 Hard iron과 Soft iron 효과에 의하여 발생하므로 이와 관련된 값을 통합 필터 측정치의 시험 통계치로 이용하여 검출하는 방법을 제안하였다. 제안한 방법의 효용성을 모의 실험과 차량 실험을 통하여 검증하였다.

• Journal of Power System Engineering
• /
• v.3 no.1
• /
• pp.60-66
• /
• 1999

Most of the small-type fishing boats in this country don't have the autopilot system such as the large ships have. In this papers, we describes on the development of electro magnetic compass for the autopilot system of the small-type fishing boat, which is utilized the MR(magnetic resistance) device and the inclination sensor. And we investigated the validity of the developed electro magnetic compass through results of actual experiment.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.21 no.4
• /
• pp.846-854
• /
• 2017

In this paper, we proposed a method to reduce the error of compass by combining the ceiling technique used in the past with modern IT technology. We combined an encoder and the Azimuth Circle for applying an algorithm. The algorithm is able to calculate the true north by using astronomical observation. Finally, we implemented the embedded system possible to indicate various situations and perform calculations. As a result, it isn't only able to calculate the true north with an error of about $0.2^{\circ}$ but also takes less than 5 seconds. Originally, using astronomical observation requires more than 5minutes. So it is analyzed as convenient by solving the problem of taking lots of time. Especially, we present the tolerance less than $0.5^{\circ}$ by the analysis of the existing gyrocompass and the bearing standard of IMO. In conclusion, we clearly confirm that the results of this paper are possible to reduce the error of various compasses in a real world.

• Journal of Korea Ship Safrty Technology Authority
• /
• v.4
• /
• pp.16-21
• /
• 2000

• Journal of Korea Ship Safrty Technology Authority
• /
• v.3
• /
• pp.14-25
• /
• 1999

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2011.06a
• /
• pp.331-332
• /
• 2011

본 논문은 위치 측정 안드로이드 프로그램과 각도 측정 안드로이드 프로그램 구현 사례를 소개한다. 구현한 프로그램을 갤럭시 S에서 실험한 결과도 소개하고 갤럭시 S2에서 실험한 결과도 소개한다. 근래에 상황기반 서비스와 증강현실 서비스가 널리 연구되고 있는데 본 연구는 이러한 실용 시스템 개발의 첫 걸음이다.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.16 no.1
• /
• pp.785-792
• /
• 2015

The purpose of this study is to analyze Compass Residences Development, also known as West Farms Development, in Bronx. NYC as a case study focusing on the characteristics of business structure and financing methodologies for affordable housing development. The case, costing total of $350M, is considered as the most notable long-term phased development of affordable housings in NYC by utilizing abandoned post-industrial site and multi-layered financing from various governmental subsidies, which is mainly LIHTC in conjunction with Tax-Exempt Bond with various other financing programs. The study may provide suggestive implications possibly related to the new Public Rental Housing Provision Plan that Seoul Metropolitan City announced recently. Moreover, will contribute to diversifying methodologies applied at domestic public rental housing development.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2004.05b
• /
• pp.101-105
• /
• 2004

The purpose of the study is to develop ship's bearing sensor using CPS receiver which can play a role as a ship's secondary compass. In this research, two GPS receivers are used to determine the bearing in real time. Then we investigated the bearing accuracy associated with the error pattern of two GPS receivers. Especially, the results are as follows ; - The investigation on the system design of GPS-Compass - The modeling to compute heading of sailing - The analysis on bearing accuracy with the error pattern - The defining possibility to play a role as a ship's secondary compass

• 제어로봇시스템학회:학술대회논문집
• /
• 1993.10a
• /
• pp.34-39
• /
• 1993

Presented in this paper is a complete error covariance analysis for strapdown inertial navigation system(SDINS). We have found that in SDINS the cross-coupling terms in gyrocompass alignment errors can significantly influence the SDINS error propagation. Initial heading error has a close correlation with the east component of gyro bias erro, while initial level tilt errors are closely related to accelerometer bias errors. In addition, pseudo-state variables are introduced in covariance analysis for SDINS utilizing the characteristics of gyrocompass alignment errors. This approach simplifies the covariance analysis because it makes the initial error covariance matrix to a diagonal form. Thus a real implementation becomes easier. The approach is conformed by comparing the results for a simplified case with the covariance analysis obtained from the conventional SDINS error model.

• Proceedings of the Korean Society for Agricultural Machinery Conference
• /
• 2002.02a
• /
• pp.426-431
• /
• 2002

본 연구에서는 DGPS와 칼라 CCD 카메라를 이용한 잡초의 검출을 위한 영상처리 시스템과 분무시스템을 개발하고 통합하여 정밀 방제 시스템을 개발하였다. 방제 요구부위에 실제 정밀한 살포를 위해 펌프, 노즐 및 레귤레이터로 구성된 장치를 구성하고 컨트롤러를 제작 통합하여 분무 시스템을 개발하였다. 개별 노즐별로 ON/OFF에 의한 변량 살포가 가능하도록 각 노즐별로 레귤레이터를 장착하였다. 정밀 방제용 이동식 차량을 제작하고 노즐별로 ON-OFF 제어가 가능한 살포장치를 부착하였으며, 알고리즘을 통합하여 정밀방제 시스템을 개발하였다. 개발한 시스템은 영상 획득 $\longrightarrow$ DGPS 좌표 획득 $\longrightarrow$ 자이로 컴파스 데이터 획득 $\longrightarrow$ 데이터베이스로부터 작물의 위치정보 획득 $\longrightarrow$ 영상처리를 이용한 방제요구부위 검출 $\longrightarrow$ 노즐별 개별 방제 작업이 순서적으로 반복해서 진행되었다. 완성된 시스템의 성능 및 안정성을 평가하기 위해서 서울대학교 부속 과수원에서 무를 대상으로 개발된 시스템을 검증하였다. 개발된 시스템은 RS-232C 통신을 이용하여 데이터의 전송을 수행할 수 있었으며, 순차적인 진행이 가능하도록 통합 프로그램을 제작하였으며, 검증 결과 정밀방제의 가능성을 보였다.