• 한국항공우주학회지
• /
• 제46권9호
• /
• pp.742-751
• /
• 2018

본 논문은 지대지 교전상황에서 유도탄 탐색기의 Field-of-View(FOV)와 가속도 제한을 고려하여 충돌각을 제어하는 시변 편향 비례항법 유도법칙(Time Varying Biased Proportional Navigation Guidance Law)을 제안하고 있다. 제안한 유도법칙은 FOV 제한을 고려하여 3단계로 구성이 되는데 각 단계에서 편향이 가속도에 직접적인 영향을 미치기 때문에 편향을 생성하는데 있어서 단계가 넘어갈 때 전 단계의 마지막 편향이 다음 단계의 시작 편향이 되도록 하였다. 또한, 교전 상황과 물리적 구속조건을 고려하여 충돌각 도달 여부를 판단하는 로직 또한 설명하고 있다.

• 아동학회지
• /
• 제27권5호
• /
• pp.123-141
• /
• 2006

The phonemic awareness program included construction of 45 activities emphasizing various sounds in speech and letter names using a storybook. The subjects were thirty 1st and 2nd grade low-income(15 experimental and 15 control group) children attending an after-school program in Seoul. Pre- and post-tests assessed children's reading, self-concept, and learning motivation. The experimental group children had rich opportunity to deal with and discuss sounds, syllables, phonemes, and the Korean alphabet names during storybook reading, games, and play over a 12 week period, while the control group children were provided with worksheets, subject tutoring, and homework guidance. Results showed that the phonemic activities were an effective and useful way to enhance children's reading ability, self-concept, and learning motivation.

• 드라이브 ㆍ 컨트롤
• /
• 제9권2호
• /
• pp.22-27
• /
• 2012

In order to improve the life and reliability of fluid components used in the Automotive, Hydraulics and Aerospace industries, the cleanliness of the system parts and components before their assembly into the system is being addressed. The measurement of components and parts cleanliness is related to contaminant collection, analysis and data reporting and ISO Standards are continually being developed to control procedures. This Paper explains the processes in these standards and explains how similar procedures have been adapted to suit the requirements of the above Industries. It also gives guidance and recommendations on the implementation of these standards, so that the best use can be made of them.

• Journal of Electrical Engineering and Technology
• /
• 제7권1호
• /
• pp.132-140
• /
• 2012

A non-conservative robust Kalman filter (NCRKF) is applied to flight data to identify the aerodynamic derivatives of an unmanned autonomous vehicle (UAV). The NCRKF is formulated using UAV lateral motion data and then compared with results from the conventional Kalman filter (KF) and the recursive least square (RLS) method. A superior performance for the NCRKF is demonstrated by simulation and real flight data. The NCRKF is especially effective in large uncertainties in vehicle modeling and in measuring flight data. Thus, it is expected to be useful in missile and aircraft parameter identification.

• 수산해양교육연구
• /
• 제19권1호
• /
• pp.121-128
• /
• 2007

The purpose of this study was to test the effect of the gender equality career education program on vocational gender egalitarianism and career identity of middle school students. The subjects of this study were 72 middle school students in Busan. They were divided into two groups, the experimental group and the control group, with 36 students each. Korea Gender Egalitarianism Scale for Adolescents and Career Identity Scale of My Vocational Situation(MVS) were used to measure vocational gender egalitarianism and career identity. Collected data were analyzed using t-test. Results of analysis showed that the experimental group showed higher vocational gender egalitarianism and higher career identity than the control group. The implications of this study for career guidance were discussed and recommendations for future research were made.

• ETRI Journal
• /
• 제45권5호
• /
• pp.746-757
• /
• 2023

This study presents a novel safe landing algorithm for urban drone deliveries. The rapid advancement of drone technology has given rise to various delivery services for everyday necessities and emergency relief efforts. However, the reliability of drone delivery technology is still insufficient for application in urban environments. The proposed approach uses the "landing angle control" method to allow the drone to land vertically and a rapidly exploring random tree-based collision avoidance algorithm to generate safe and efficient vertical landing paths for drones while avoiding common urban obstacles like trees, street lights, utility poles, and wires; these methods allow for precise and reliable urban drone delivery. We verified the approach within a Gazebo simulation operated through ROS using a six-degree-of-freedom drone model and sensors with similar specifications to actual models. The performance of the algorithms was tested in various scenarios by comparing it with that of stateof-the-art 3D path planning algorithms.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 1996년도 추계학술대회 논문집
• /
• pp.474-478
• /
• 1996

Process monitoring in laser welding is essential for automation and quality control of products. Various signals from laser welding, such as plasma, sound, optical signals, etc., are utilized for monitoring the process and detecting abnormal weld conditions. In this study, both W light from plasma formed above the weld pool and IR signal from the melting pool are detected with photodiodes and PC-based A/D board, and analyzed to give a guidance about the weld quality. Experimental results show the possibility of using the signals for predicting and evaluating the weld qualify and adapting into the system for on-line process monitoring.

• Journal of Positioning, Navigation, and Timing
• /
• 제10권3호
• /
• pp.221-228
• /
• 2021

The Korea Augmentation Satellite System (KASS) is a Korean Satellite Based Augmentation System (SBAS) that has been under development since 2014 with the goal of providing Approach Procedure with Vertical guidance (APV)-I Safety of Life (SoL) services. KASS Control Station (KCS) is a subsystem that controls and monitors KASS systems. It also serves to store data generated by KASS. KCS has now completed detailed design and implementation and verification is in progress. This paper presents verification procedures and verification items for KCS verification activities and presents management measures for defects occurring during the verification phase.

• 동굴
• /
• 제77호
• /
• pp.67-72
• /
• 2007

ATMega8535 Controller is the ideal solution for use as a standard controller in many applications. The small compact size combined with easy program updates and modifications, make it ideal for use in machinery and control systems, such as alarms, card readers, real-time monitoring applications and much more. This board is ideal as the brains of your robot or at the center of your home-monitoring system. Today, most drivers must use a parking place day by day. Therefore we make time shorten. Using above-mentioned ATmega8535, a sensor of infrared rays, led and lcd, we will make a parking system which is able to display parking situation and lead a car at the best position of Parking easily and quickly. Trying this project, we will be more closer to practical application of electronic engineering bit by bit.

• Journal of Biosystems Engineering
• /
• 제23권3호
• /
• pp.291-304
• /
• 1998

A control algorithm fir the unmanned vehicles was developed using image information received through a CCD camera that acquires more powerful information over the wide range of wave-length comparing with other sensors and was applied to a speed-sprayer. The algorithm consisted of straight mode for passing along with middle of two tree-rows and turning mode for changing from a row to another row. In case of turning mode, two marks of colored papers were employed to indicate turning point and to decide turning direction for various orchard situations. The method of analysis and image would be differed according to camera's tilt-angle and position that is set on the speed-sprayer. Hence, it analyzed the point of difference by making camera's up and downward tilt-angle.