• 한국자동차공학회논문집
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• 제15권1호
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• pp.8-15
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• 2007

Freeway corridors consist of urban freeways and parallel arterials that drivers can use alternatively. Ramp metering in freeways and signal control in arterials are contemporary traffic control methods that have been developed and applied in order to improve traffic conditions of freeway corridors. However, most of the existing studies have focused on either optimal ramp metering in freeways, or progression signal strategies between arterial intersections. There have been no traffic control systems in Korea that integrates the freeway ramp metering and arterial signal control. The effective control strategies for freeway operations may cause negative effects on arterial traffic. On the other hand, traffic congestion and bottleneck phenomenon of arterials due to the increasing peak-hour travel demand and ineffective signal operation may generate an accessibility problem to freeway ramps. Thus, the main function of the freeway which is the through-traffic process has not been successful. The purpose of this study is to develop an integrated control model that connects freeway ramp metering systems and signal control systems in arterial intersections. And Optimization of integrated control model which consists of ramp metering and signal control is another purpose. The design of experiment, neural network, and simulated annealing are used for optimization.

• 한국정보전자통신기술학회논문지
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• 제5권3호
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• pp.144-151
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• 2012

한국에서 만성위염은 10명당 한 명 꼴로 발생하는 질병이다. 서양의학에서는 만성위염을 진단하기 위해서 내시경 조사를 하지만 이는 환자에게 고통을 주고 비용이 비싸다는 단점을 가지고 있다. 반면 전통한방의학에 따르면, 오른쪽 손목의 '관' 위치는 위와 관련이 있다. 따라서 오른쪽 손목의 '관' 위치의 맥파를 측정하면 만성위염을 진단할 수 있을 것이다. 하지만 맥진은 한의사들의 지식과 경험에 의존하고 있다. 본 연구에서는 맥파를 분석하기 위한 체계적인 접근 방법을 제안한다. 처음에 맥파는 전처리 과정을 거친다. 그 다음 맥파에 가우시안 모델을 적용시킨 후, 맥파의 주요 인자들을 추출한다. 그리고 t-검증과 통계적 차이를 이용하여 질병에 민감한 파라미터들을 선택한다. 마지막으로 선택한 파라미터들은 분류를 위해서 Fuzzy C-Means (FCM) 알고리즘에 입력된다. 분류 결과 건강한 사람은 95% 만성위염 환자는 87% 분류하였다.

• 디지털융복합연구
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• 제20권5호
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• pp.317-322
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• 2022

일반적으로 구명조끼는 수상에서 위급한 상황에 처한 사람이 착용하여 물에 빠지지 않고 수면 위로 부상할 수 있도록 하는 것으로 구명조끼는 단순히 가라앉지 않도록 하는 역할을 할 뿐, 위급한 상황에 처한 조난지가 조기에 구출될 수 있도록 적극적인 도움을 주지 못한다. 이러한 문제점을 해결하기 위해 조난자가 위급 상황 시에 자동으로 조난신호가 발생하는 장치를 개발하였다. 조난자가 수중에 잠시면 자동으로 조난신호 발생장치가 구명조끼와 분리되어 위치값과 등의 정보를 무선으로 전송하고 LED 광을 이용한 구조신호를 보낼 수 있게 하였다. 실험결과 물속에 잠기면 자동으로 구명조끼와 조난신호 발생장치가 분리되었고, GPS에 수신된 위치의 좌표값이 무선전송되는 결과를 확인하였다. 이를 활용하면 조난자나 실종자의 위치를 파악할 수 있어 위급 상황 시 신속하게 대체할 수 있다

• 한국ITS학회 논문지
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• 제20권2호
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• pp.15-29
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• 2021

신호교차로는 차량들의 회전 등으로 인한 상충이 빈번히 발생하고 차량의 주행이 교통신호에 의해 통제되기 때문에 자율주행차에게 가장 도전적인 공간이다. 교통신호가 존재하는 도시부 도로에서 안전한 주행을 도모하기 위해서는 자율주행차가 V2I 통신을 통하여 교통신호정보를 인프라로부터 제공받을 필요가 있다. 이러한 배경 하에 경찰청 교통신호제어기 표준규격서에는 교통신호정보 제공을 위한 규약이 추가되었다. 하지만, 기존 규약이 아날로그 교통신호제어기 위주로 정의되어 있어 현재 개발되고 있는 디지털 교통신호제어기에 적용하는 것에는 기술적 한계가 존재한다. 따라서 본 연구에서는 디지털 교통신호제어기로부터 자율주행차에게 교통신호정보를 제공하기 위한 신호정보연계모듈 개발 방안과 교통신호 전이 시의 정확한 교통신호정보를 제공할 수 있는 알고리즘 개선 방안을 제시하고자 한다.

• 한국전자파학회:학술대회논문집
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• 한국전자파학회 2005년도 종합학술발표회 논문집 Vol.15 No.1
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• pp.235-240
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• 2005

This paper presents a dual band circularly polarized microstrip patch antenna. The antenna consists of two corner truncated patches implemented in one plane and single feed point. The input signal is directly excited to the patch 2 and the patch 1 is fed from patch 2 by coupling between two patches. The antenna is operated at 900 MHz and 2.45 GHz bands and has the right hand circularly polarized radiation pattern at all. The measured gains of the antenna are 2.95 dBic at 900 MHz band and 4.6 dBic at 2.45 GHz band.

• Journal of Multimedia Information System
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• 제6권4호
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• pp.329-332
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• 2019

Recently, smart lighting systems are the combination between sensors and lights. These systems turn on/off and adjust the brightness of lights based on the motion of object and the brightness of environment. These systems are often applied in places such as buildings, rooms, garages and parking lot. However, these lighting systems are controlled by lighting sensors, motion sensors based on illumination environment and motion detection. In this paper, we propose an automatic lighting control system using one single camera for buildings, rooms and garages. The proposed system is one integration the results of digital image processing as motion detection, hand gesture detection to control and dim the lighting system. The experimental results showed that the proposed system work very well and could consider to apply for automatic lighting spaces.

• 제어로봇시스템학회논문지
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• 제17권10호
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• pp.1014-1020
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• 2011

This presents a motion and force estimation system of human fingers by using an Electromyography (EMG) sensor module and a data glove system to be proposed in this paper. Both EMG sensor module and data glove system are developed in such a way to minimize the number of hardware filters in acquiring the signals as well as to reduce their sizes for the wearable. Since the onset of EMG precedes the onset of actual finger movement by dozens to hundreds milliseconds, we show that it is possible to predict the pattern of finger movement before actual movement by using the suggested system. Also, we are to suggest how to estimate the grasping force of hand based on the relationship between RMS taken EMG signal and the applied load. Finally we show the effectiveness of the suggested estimation system through several experiments.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2004년도 ICEIC The International Conference on Electronics Informations and Communications
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• pp.259-262
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• 2004

In most of the character recognition systems, the method of template matching or statistical method using hidden Markov model is used to extract and recognize feature shapes. In this paper, we used modified chain-code which has 8-directions but 4-codes, and made the chain-code of hand-written character, after that, converted it into transition chain-code by applying to HMM(Hidden Markov Model). The transition chain code by HMM is analyzed as signal flow graph by Mason's theory which is generally used to calculate forward gain at automatic control system. If the specific forward gain and feedback gain is properly set, the forward gain of transition chain-code using Mason's theory can be distinguished depending on each object for recognition. This data of the gain is reorganized as tree structure, hence making it possible to distinguish different hand-written characters. With this method, $91\%$ recognition rate was acquired.

• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2002년도 춘계학술대회
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• pp.31-36
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• 2002

In this paper, we developed a working adaptation evaluation system using finger force measurement which interact between material and biological system. The system consists of a finger force transducer, a signal conditioner, an A/D converter, a computer, and a software system for data processing. The finger force transducer is made by a load cell and a special mechanism. The data processing software controls the A/D converter, data monitoring, and data analysis for group classification. The developed system were tested by 4 different materials in left hand and the finger forte transducer in the other hand's thumb and index finger with 16 persons. As the results of experiments, the developed system could measure the finger force quantitatively and classify the measured values into four groups.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 심포지엄 논문집 정보 및 제어부문
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• pp.120-122
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• 2004

Wearable input device that can make free-space typewriting possible is introduced. We named this device as $SCURRY^{TM}$. To measure the angular velocity of hand and the acceleration rates at the ends of fingers, we buried MEMS inertial sensors in this keyboard. We processed sensor signals to get the information on hand movement and finger-click motion. With this signal processing, apparent finger movements were depicted over the virtual keyboard shown on output device of a target computing system. In this paper, a finger-click recognition method is proposed to improve the recognition performance for finger clicking of $SCURRY^{TM}$. The proposed method is composed of three parts including feature extraction part, valid click part, and cross-talk avoidance part. The experiments were conducted to verify the effectiveness and efficiency of the proposed algorithms.