• Annual Conference on Human and Language Technology
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• 2000.10d
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• pp.224-230
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• 2000

기존의 전문 검색 시스템은 문서를 단지 단어의 연속이라는 제한적 관점에서만 바라보았다. 또한 기존의 필드 검색 시스템은 고정된 필드를 색인 및 검색대상으로 하거나, 문서의 내용이 아닌 메타 정보에 관한 검색만이 가능하였다. 본 논문에서는 내용과 필드 구조를 통합하여 가변 필드 구조 문서를 색인 및 검색하는 모델인 교차 필드 검색 모델을 제안한다. 기존 정보검색 시스템의 기능을 기본으로 제공하면서 필드구조를 색인/검색하기 위한 기능적 요구사항을 제시하고, 내용 및 필드 구조를 색인하면서 동적인 삽입/삭제가 가능한 색인 구조를 제안한다. 아울러 검색시에 문서 가중치를 계산하여 문서를 순위조정하는 불리언 모델, 확장 불리언 모델, 벡터 공간 모델의 변형 모델을 제시한다. 아울러 구현 사례로 STEER-XDS 검색 시스템에 대해 알아본다.

• Annual Conference of KIPS
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• 2010.04a
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• pp.713-716
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• 2010

위치 정보 제공 시스템은 이동성이 있는 물건 또는 개인이 특정한 시간에 존재하거나 존재하였던 장소에 관한 정보를 제공하는 시스템이다. 시각 장애인들은 인도, 교차로, 계단, 엘리베이터 등 위협요소가 있는 특정 장소 등의 환경 문제로 사회의 참여가 어렵다. 이에 거리 곳곳에 설치된 RFID Tag의 위치정보를 다양한 통신망을 활용하여 중앙 서버의 MAP 데이터에 연계 시켜 시각 장애인에게 음성 및 경고 알림 진동으로 길을 안내해주는 위치 정보 제공 시스템을 설계하였다.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.46 no.7
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• pp.13-23
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• 2009

In this paper, the network performance of a turbo coded optical code division multiple access (CDMA) system with cross-layer, which is between physical and network layers, concept is analyzed and simulated. We consider physical and MAC layers in a cross-layer concept. An intensity-modulated/direct-detection (IM/DD) optical system employing pulse position modulation (PPM) is considered. In order to increase the system performance, turbo codes composed of parallel concatenated convolutional codes (PCCCs) is utilized. The network performance is evaluated in terms of bit error probability (BEP). From the simulation results, it is demonstrated that turbo coding offers considerable coding gain with reasonable encoding and decoding complexity. Also, it is confirmed that the performance of such an optical CDMA network can be substantially improved by increasing e interleaver length and e number of iterations in e decoding process. The results of this paper can be applied to implement the indoor optical wireless LANs.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.15 no.3
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• pp.45-51
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• 2016

Existing real-time signal control system was brought up typical problems which are supersaturated condition, point detection system and loop detection system. For that reason, the next generation signal control system of advanced form is required. Following thesis aimed at calculating queue length for the next generation signal control system to utilize basic parameter of signal control in crossing queue instead of the volume of real-time through traffic. Overflow saturated condition which was appeared as limit of existing system was focused to set-up range. Real-time location information of individual vehicle which is collected by GPS data. It converted into the coordinate to apply shock wave model with an linear equation that is extracted by regression model applied by a least square. Through the calculated queue length and link length by contrast, If queue length exceed the link, queue of downstream intersection is included as queue length that upstream queue vehicle is judeged as affecting downstream intersection. In result of operating correlation analysis among link travel time to judge confidence of extracted queue length, Both of links were shown over 0.9 values. It is appeared that both of links are highly correlated. Following research is significant using real-time data to calculate queue length and contributing to signal control system.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.32 no.2D
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• pp.137-145
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• 2012

According to the National Police Agency, the total number of traffic accidents which occurred in 2010 was 226,878. Intersection accidents accounts for 44.8%, the largest portion of the entire traffic accidents. An research on the signalized intersection is constantly made, while an research on the unsignalized intersection is yet insufficient. This study selected traffic volume, road width, and sight distance as the input variables which affect unsignalized intersection accidents, and number of accidents as the output variable to build a model using ANFIS(Adaptive Neuro-Fuzzy Inference System). The forecast performance of this model is evaluated by comparing the actual measurement value with the forecasted value. The compatibility is evaluated by R2, the coefficient of determination, along with Mean Absolute Error (MAE) and Mean Square Error (MSE), the indicators which represent the degree of error and distribution. The result shows that the $R^2$ is 0.9817, while MAE and MSE are 0.4773 and 0.3037 respectively, which means that the explanatory power of the model is quite decent. This study is expected to provide the basic data for establishment of safety measure for unsignalized intersection and the improvement of traffic accidents.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.23 no.2
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• pp.79-88
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• 2024

We used actual field data to analyze from a traffic engineering perspective how AI and edge computing technologies affect the reduction of traffic accidents. By providing object information from 20m behind with AI object recognition, the driver secures a response time of about 3.6 seconds, and with edge technology, information is displayed in 0.5 to 0.8 seconds, giving the driver time to respond to intersection situations. In addition, it was analyzed that stopping before entering the intersection is possible when speed is controlled at 11-12km at the 10m point of the intersection approach and 20km/h at the 20m point. As a result, it was shown that traffic accidents can be reduced when the high object recognition rate of AI technology, provision of real-time information by edge technology, and the appropriate speed management at intersection approaches are executed simultaneously.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.12 no.5
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• pp.73-86
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• 2013

This study aimed to measure the behaviors of drivers approaching a roundabout and analyze the characteristics of them. For these objectives, a system to measure the in-vehicle behaviors of a driver when he/she approaches a roundabout. The reliability of the system was analyzed, and the result were applied to a driving test in a roundabout. The result suggested that drivers showed cognitive responses to the accelerator pedal $176.0{\pm}35.18m$ ahead of the approach zone. And they showed cognitive responses to the brake pedal and the speed of the vehicle $121.0{\pm}26.01m$ and $66.0{\pm}18.31m$ ahead of the approach zone, respectively. As for drivers' cognitive changes between the start and end points of their cognitive responses at a roundabout, the standard deviation of the time of response was ${\pm}26.01m$, and the standard deviation of the end point was ${\pm}7.03m$, which meant that there was a 3.71-fold gap between the two deviation values. During the test, differences among the drivers were observed, but no difference was observed among trails.

• Journal of Internet of Things and Convergence
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• v.10 no.6
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• pp.117-123
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• 2024

In the past, making a right turn at intersections relied entirely on the driver's judgment. The Act on the Passage of Intersections was revised in 2023 to require drivers to yield or pause when there are pedestrians crossing or about to cross the crosswalk. Despite the revision, many drivers are unaware of the new law and continue to make right turns as before. Moreover, some drivers have a complacent attitude, thinking "nothing will happen anyway" when they follow the old method. Even drivers who know the correct way to pass often make sudden stops due to pedestrians being in blind spots. This creates dangerous situations for pedestrians. This paper proposes a system that warns drivers about pedestrians' presence using the YOLOv8x model. The system is activated based on the presence of pedestrians, creating a light induction effect that helps drivers naturally recognize pedestrians, preventing accidents.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.10 no.4
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• pp.99-104
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• 2010

We introduce Internet TCP/IP control system to monitor the traffic volume on the traffic network system. To check the traffic volume on traffic road, we use the traffic detector system shppe of circle or diamond or rectangular. Nevertheless we use traffic detector, we will use internet addressin TCP/IP system. If we use TCP/IP control system, we acquire many good point, we achive high sircurity and low costness traffic monitoring system coming difficulty and high level position. But internet system is very easy and low cost direction. Traffic control system is very more depending on the high techinquesion and very complexity. Therefore we introducing TCP/IP internet addressing control system schemetic point.

• The Magazine of the IEIE
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• v.24 no.9
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• pp.52-61
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• 1997