Young-Choon Kim

Small target detection using cross product based on temporal profile in infrared image sequences

This paper presents a new small target detection method using the cross product of the temporal pixels based on the temporal profile in infrared (IR) image sequences. The temporal characteristics of small targets and the various backgrounds are different. A new algorithm classifies target pixels and the background pixels through the hypothesis testing using the cross product of pixels on the temporal profile and predicts the temporal backgrounds based on the results. The small targets are detected by subtracting the predicted temporal background profile from the original temporal profile. For the performance comparison between the proposed algorithm and the conventional algorithms, the receiver operating characteristics (ROC) curves is computed in experiment. Experimental results show that the proposed algorithm has better discrimination and a lower false alarm rate than the conventional methods.

Implementation of a reticle seeker missile simulator for jamming effect analysis

In this paper, we implement a reticle seeker missile simulator on MATLAB-SIMULINK to analyze the jamming effect of the spin-scan and conscan reticle seeker. The DIRCM (Directed Infrared Countermeasures) system uses the pulsing flashes of infrared (IR) energy and its frequency and intensity have influence on the missile guidance system. Our simulation results show that jamming effect is indicated significantly when jammer frequency and reticle frequency are similar and present a 3D trajectory of missile motions by jamming.

A novel Two-Dimensional LMS (TDLMS) using sub-sampling mask and step-size index for small target detection

In this paper, we propose a novel TDLMS filter using a sub-sampling mask and step-size index for small target detection in infra-red (IR) imagery. The concept of the proposed TDLMS is to utilize the sub-sampling mask of the weight-matrix having the structure reducing effects of the target pixels in order to predict the background exactly. And the nonlinear step size using the luminance rate (LR) and contrast rate (CR) is used and then background is predicted finally by using the two-dimensional Gaussian distance (TDGD). Experimental results show that the proposed method exhibits higher detection rates in comparison to the conventional TDLMS filter.

Recursive multi-SEs NWTH method for small target detection in infrared images

Mathematical morphology techniques, such as white top-hat (WTH) and new white top-hat (NWTH) transformation have been researched for small target detection application in the infrared (IR) images. However, its target enhancement performance still depends on its SE size set by users. To solve this problem, we propose a recursive multi-structuring elements (multi-SEs) NWTH method with an automatic decision mechanism of the SE size. The proposed method based on the NWTH transformation updates the multi-SEs by calculating candidate target-to-clutter ratio gain (CTCRG) of the NWTH images by the multi-SEs. Through a recursive procedure, final multi-SEs is automatically selected, and then small targets can be detected in a summation image of NWTH images by the final multi-SEs.

DIRCM jamming effect analysis of spin-scan reticle seeker

The function of DIRCM (directed infrared countermeasures) jamming is to cause the missile to miss its intended target by disturbing the seeker tracking process. The DIRCM jamming uses the pulsing flashes of infrared (IR) energy and its frequency, phase and intensity have the influence on the missile guidance system. In this paper, we analyze the DIRCM jamming effect of the spin-scan reticle seeker. The simulation results show that the jamming effect is greatly influenced by frequency, phase and intensity of the jammer signal.

An Iterative Bilateral Weighted Median filter for the removal of High-Density impulse noise

For removing the impulse noise with better edge and fine detail preservation, we propose an iterative bilateral weighted median (IBWM) filter. Instead of the specified weight of WM filters, we propose a novel weight fuction, bilateral weight (BW) where is the combination of domain weight (DW) in spatial domain and range weight (RW) in intensity domain. The DW is designed to give higher weight to pixels that are spatially close to a center pixel. And the RW is designed to give higher weight to pixels that are similar to the mean value of pixels in the filtering window. Finally, the rates of DW and RW are controlled according to noise distributions in a filtering window. For ensuring high accuracy of noise detection, the IBWM filter uses iterative process using increasing filtering window size. Simulation results indicate that our algorithm provides a significant improvement than any other existing techniques.

The Development of Miniature Propelling System for Electric Brake at Extreme Low Speed

In this paper, how to stop a moment to experiment with stop function, electric brake type scale model propulsion system is designed and fabricated by control of the braking torque is proposed. Scale model system for motor-driven, inertial load, the structure of the load for the motor and the inverter system was constructed with two sets of converters, the actual range of the rotational speed of the vehicle DDM experiments to be able to. In Additional, observer to estimate the rotor position and speed of using resolver, and the pole at low speed, speed detection methods have been developed. As a result of this study, first, stop the moment Second, the reduction of braking torque, and how to initiate the operation of the air brake blending by using the braking, improve braking methods that only use the electric brake to stop brought.

The study of RFID Tag read range test with RFID Emulator

RFID technology uses communication through the use of radio waves to transfer data between a reader and an electronic tag attached to an object for the purpose of identification and tracking. RFID technology can be applied to the various service areas such as, position determination technology, remote processing management and information exchange between objects by collecting, storing, processing, and tracing their informations from the tag attached to the objects using electronic wave by recognizing the information and environment of those objects. However, to revitalize these various services, it is important to test the RFID tag performance. But There are few instructions which have and hold the RFID emulator technology for organizing the RFID international test environment. Also there are not many manufacturing companies which recognize about the exact RFID test standard and requirements for the International Standards. In this paper, a construction of Tag Performance test environments and test methods are suggested which are required by EPCglobal or ISO/IEC. Details about RFID Tag performance test items proposed by ISO/IEC FDIS 18046-3 are explained, performed RFID Tag performance test through the performing test against each measured item, and draw a result for the RFID Tag performance of International Standards.

Sensorless Vector Control for IM Adaptive Sliding Mode Controller

Abstract In this paper, using the adaptive sliding mode observer for speed sensorless vector control is proposed.. Adaptive sliding mode observer of the motor stator coordinate system using the voltage equations of the rotor flux components are observed. Motor speed was obtained by the Lyapunov function is estimated by the relationship further. In order to establish such a control scheme based on the way conventional PI controller and sliding mode observer annexing characteristics of the system through simulation and experiment were compared. According to analysis by comparison with the usefulness of the system was confirmed. Key Words : Adaptive Sliding Mode, Sensorless Vector, Layapunov Fuction, Observer * 교신저자 : 조문택(mtcho@mail.daewon.ac.kr)접수일 11년 09월 25일 수정일 11년 10월 07일 게재확정일 11년 11월 10일 1. 서 론 유도전동기 제어를 위한 적응 관측기에서 속도 등 알 수 없는 파라미터들은 적응제어 이론을 기초로 한 부가적인 방정식에 의해서 추정된다[1,2]. 이것은 안정성에 대한 분석적인 상태들을 알게 한다. 이러한 제안들 중에서 적응 슬라이딩 모드 관측기는 그것이 외란 , 파라미터 미분, 그리고 시스템 노이즈에 강인하기 때문에 선호된다[3-5].전동기의 파라미터가 온도에 비례하여 변동하거나, 실제값과 다르게 나타날 때 추정된 자속과 속도는 실제 값에서 벗어나며, 이것들을 극복하기 위하여 파라미터의 변화와 제어입력이 불연속적으로 변화하는 비선형 제어의 특성과 슬라이딩 모드의 특성에 적응하는 적응제어 특성의 제어의 설계가 요구된다.본 논문에서 적응 슬라이딩 모드 제어기를 이용한 유도전동기의 센서리스 벡터제어 기법을 제시한다. 적응 슬라이딩 모드 제어기 설계를 위하여 극배치법을 이용하여 등가제어 시스템으로서의 초평면을 설계하고, 초평면 상태를 항상 구속시키기 위해서 비선형 입력인 적응 슬라이딩 모드 제어기를 설계한다[6]. 또한 고주파 진동모드를 제어에 의해 여진하지 않도록 고주파수 영역의 입력이득에 저역필터를 추가하여 고주파진동을 억제한다. 적응 슬라이딩 모드 관측기는 전동기 전압방정식을 이용하여 2상고정자 기준좌표에 의해 회전자 자속성분을 관측한다. 전동기 속도는 Lyapunov함수에 의해서 얻어진 추가적인 관

Web Contents Mining System for Real-Time Monitoring of Opinion Information based on Web 2.0

This paper focuses on the opinion information extraction and analysis system through Web mining that is based on statistics collected from Web contents. That is, users` opinion information which is scattered across several websites can be automatically analyzed and extracted. The system provides the opinion information search service that enables users to search for real-time positive and negative opinions and check their statistics. Also, users can do real-time search and monitoring about other opinion information by putting keywords in the system. Proposing technique proved that the actual performance is excellent by comparison experiment with other techniques. Performance evaluation of function extracting positive/negative opinion information, the performance evaluation applying dynamic window technique and tokenizer technique for multilingual information retrieval, and the performance evaluation of technique extracting exact multilingual phonetic translation are carried out. The experiment with typical movie review sentence and Wikipedia experiment data as object as that applying example is carried out and the result is analyzed.