• 한국정보통신학회논문지
• /
• 제26권8호
• /
• pp.1248-1254
• /
• 2022

스쿨존에서 교통사고를 사전에 예방하려고 노력하고 있다. 하지만, 스쿨존 내 교통사고는 계속 발생하고 있다. 운전자가 어린이보호구역 내 상황 정보를 미리 알 수 있으면, 사고를 줄일 수 있다. 본 논문에서는 스쿨존 내 사각지대를 없애는 카메라, 사전 교통정보를 수집할 수 있는 번호인식 카메라 시스템을 설계한다. 차량속도 및 보행자를 인식하는 LIDAR 시스템을 개선하여 설계한다. 카메라 및 LIDAR에서 인식된 보행자 및 차량 영상 정보를 수집하고 가공하여, 인공지능 시계열 분석 및 인공지능 알고리즘을 적용한다. 본 논문에서 제안한 딥러닝으로 학습된 인공지능 교통사고 예방 시스템은, 스쿨존 진입 전 차량 내 모바일 장치에 스쿨존의 정보를 운전자에게 전달하는 강제 푸시서비스를 한다. 그리고 LED 안내판에 스쿨존 교통정보를 알람으로 제공한다.

• 드라이브 ㆍ 컨트롤
• /
• 제17권4호
• /
• pp.8-14
• /
• 2020

Intelligent devices using ICT technology have been introduced in the field of construction machinery to improve productivity and stability. Among the intelligent devices, Machine Guidance is a device that provides real-time posture, location, and work range to drivers by installing various sensors, controllers, and satellite navigation systems on construction machines. Conversely, the efficiency of equipment that requires location information, such as machine guidance, will be greatly reduced in buildings, and tunnels in the GPS blind spots. Thus, the other high-precision positioning technologies are required in the GPS blind spot zone. In this study, we will develop a relative position measurement system that provides precise location information such as construction machinery and robots in a local area where the GPS reception is difficult. A relative position measurement system tracks a marker in the form of a sphere installed on a vehicle by using the image base tracking technology, and measures the distance and direction information to the marker to calculate a position.

• Steel and Composite Structures
• /
• 제18권5호
• /
• pp.1305-1330
• /
• 2015

The successful application of the component-based approach - widely used to model structural joints - requires knowledge of the mechanical properties of the constitutive joint components, including an appropriate assembly procedure to derive the joint properties. This paper presents a component-method model for a structural joint component that is located in the tension zone of blind-bolted connections to concrete-filled tubular steel profiles. The model relates to the response of blind-bolts with headed anchors under monotonic loading, and the blind-bolt is termed the "Extended Hollo-bolt". Experimental data is used to develop the model, with the data being collected in a manner such that constitutive models were characterised for the principal elements which contribute to the global deformability of the connector. The model, based on a system of spring elements, incorporates pre-load and deformation from various parts of the blind-bolt: (i) the internal bolt elongation; (ii) the connector's expanding sleeves element; and (iii) the connector's mechanical anchorage element. The characteristics of these elements are determined on the basis of piecewise functions, accounting for basic geometrical and mechanical properties such as the strength of the concrete applied to the tube, the connection clamping length, and the size and class of the blind-bolt's internal bolt. An assembly process is then detailed to establish the model for the elastic and inelastic behaviour of the component. Comparisons of model predictions with experimental data show that the proposed model can predict with sufficient accuracy the response of the component. The model furthers the development of a full and detailed design method for an original connection technology.

• 자동차안전학회지
• /
• 제6권1호
• /
• pp.27-32
• /
• 2014

A study assessing driver acceptance level for various active safety systems against Korean drivers has been conducted. A 2013 Cadillac ATS model vehicle was tested along southern outskirt of Seoul including local roadway and interurban highway. Active safety systems included were FCA(Forward Collision Alert), LDW(Lane Departure Warning), SBZA(Side Blind Zone Alert), FRPA(Front/Rear Park Assist), RCTA(Rear Cross Traffic Alert), ACC(Adaptive Cruise Control), and AEB(Autonomous Emergency Braking). Participants experienced the FRPA, RCTA and AEB features in a controlled parking lot with a dummy vehicle and traffic cones as target obstacles. Remaining features have been tested on the accumulated stretched of 106 km long urban and interurban roadway. Series of questionnaires corresponding to each active safety systems have been conducted. Tentative results revealed that RCTA and SBZA systems received favourable ratings compared to the other ones.

• 자동차안전학회지
• /
• 제8권2호
• /
• pp.6-10
• /
• 2016

The objective of this paper is to understand value of active safety features on the customer perspective. In this study, 30 participants who don't have experience with active safety features were recruited and asked for preference, usefulness and consideration of each active safety feature after driving evaluation by them. Through this research, the preference of active safety features were analyzed and which of active safety features were the most useful and the most considered by customer when they purchase new vehicle. As a result, adaptive cruise control and side blind zone alert were the most strongly preferred and considered features by respondents and it means that respondents wanted comfort environment while driving and seemed to value features that compensated for limited visibility. On the other hand, active safety features that warned driver without control of the vehicle was deemed generally less desirable such as lane departure warning and forward collision alert. But autonomous emergency braking was higher than the other active safety features with only warning even if they did not have experience for it while this test. They thought it will be helpful in case of front-end collision situation even they just listened description before the test.

• 한국임상수의학회지
• /
• 제39권3호
• /
• pp.114-120
• /
• 2022

The purpose of this study is to examine the status of quality control using multipurpose phantom of ultrasound equipment used in hospital of veterinary college in South Korea by using ATS-539 multipurpose phantom so as to examine quantitative and objective new image evaluation method. Specialists discussed and analyzed multipurpose phantom images acquired by using convex transducer of 10 ultrasound imaging devices, currently used in 9 veterinary colleges, at 4.0-6.0 MHz. Total 8 items that can be measured with ATS-539 multipurpose phantom including dead zone, vertical and horizontal measurement, axial/lateral resolution, sensitivity, focal zone, functional resolution and gray scale/dynamic range were evaluated. For qualitative evaluation, valid decisions were made based on dead zone, axial/lateral resolution, and gray scale/dynamic range which are resolution index, and coefficient of variation (COV) and blind referenceless image spatial quality evaluator (BRISQUE) were found to increase objectivity. As a result of experiment, all the targeted ultrasonic devices were found appropriate from qualitative evaluation items of dead zone, axial/lateral resolution, and gray scale/dynamic range. In other evaluation items, they were found to be appropriate from focal zone and vertical measurement of quantitative evaluation while inappropriate from horizontal measurement, sensitivity, and functional resolution. COV value was 0.12 ± 0.04, and BRISQUE value was 47.77 ± 2.77, both analysis results show that the noise level of all ultrasonic devices was located within tolerance range. Upon image examination using ATS-539 multipurpose phantom, they were 100% appropriate with inspection standards of dead zone, axial/lateral resolution, and gray scale/dynamic range, and besides, focal zone and functional resolution can be used as evaluation items. In the field of veterinary medicine, 8 standard items using ATS-539 multipurpose phantom and image evaluation items using COV and BRISQUE can be used as standards for quality control of ultrasonography machine.

• 한국컴퓨터정보학회:학술대회논문집
• /
• 한국컴퓨터정보학회 2023년도 제68차 하계학술대회논문집 31권2호
• /
• pp.639-640
• /
• 2023

차량에는 사각지대가 운전자에게 쉽게 보이지 않으며, 안전지대를 보이게 하는 시스템이 많이 있다. 본 논문에서는 사각지대 차량 안전 지원 시스템의 사물인식 개발을 위한 요구사항, 사물인식 네트워크 구조, 훈련기법에 대해 살펴본다.

• 터널과지하공간
• /
• 제18권3호
• /
• pp.202-213
• /
• 2008

이 논문은 3차원 탄성파 토모그래피의 3차원 초동주시 및 역산 알고리즘의 개발과 수치모형 실험을 통하여 3차원 토모그래피 기법의 현장 적용성을 고찰한 연구이다. 3차원 탄성파 주시토모그래피 기법의 현장 적용성을 담보하기 위해서는 한정된 송수신 커버리지에 기인하는 암영대가 발생하지 않아야 하고 또한 경제적인 관점에서 자료처리에 소요되는 시간이 합리적이어야 한다. 이 연구에서는 한정된 송수신 커버리지 문제를 극복하기 위하여 파선 폭의 확장기법의 하나인 프레넬 볼륨에 근거한 3차원 주시 토모그래피 알고리즘을 개발하였다. 또한 3차원 토모그래피 수행에 요구되는 정밀도와 경제성을 확보하기 위해 Fast Marching Method(FMM)을 이용한 초동주시 알고리즘을 선택하였으며 수치모형 실험을 통하여 합리적인 모델변수를 결정하였다. 3차원 고립형 이상체 및 경사진 층서구조 수치모형에 대한 3차원 탄성파속도 입방체를 도출함으로써 개발된 알고리즘의 타당성 및 현장 적용성을 고찰하였다. 재구성된 탄성파 임방체는 원 수치모형과 대비한 결과 상호 부합하는 결과를 확인함으로써 3차원 토모그래피 알고리즘의 타당성 및 현장 적용성을 검증하였다.

• 자동차안전학회지
• /
• 제7권1호
• /
• pp.33-39
• /
• 2015

This study examined the drivers' acceptance level of various active safety features with Korean drivers on Seoul urban and city roads. The test vehicle, 2013 Cadillac ATS, was equipped with FCA(Forward Collision Alert), LDW(Lane Departure Warning), SBZA(Side Blind Zone Alert), FRPA(Front/Rear Park Assist), RCTA(Rear Cross Traffic Alert), ACC(Adaptive Cruise Control), and AEB(Autonomous Emergency Braking). Participants had chances to run the tests on those systems in the parking lot accompanied by the 106km long stretch of predetermined route including local road and interurban highway in Seoul and Gyeonggi-do under normal traffic flowing environment. After the test, participants completed a series of questionnaires about the features they experienced. The results revealed that RCTA and SBZA systems received more favourable ratings compared to the other features in avoiding crashes. The respondents preferred sound alerts to haptic ones even though haptic warning methods were better in providing directional information.

• 한국자동차공학회논문집
• /
• 제14권5호
• /
• pp.107-114
• /
• 2006

This paper investigates the radiating source of electro-magnetic waves in the cabin of automobile with spark ignition engine. Front seats are very close to the engine room where electro-magnetic waves are expected to be radiating. But front seat area is believed to be a blind zone, which is not affected by radiating electro-magnetic waves, because a bulk board and floor board shield the front seat area. The level and frequency spectrum of electro-magnetic waves are measured at the passenger seat and the engine room. The measured frequency range is $145{\sim}365MHz$. As a results, the level of the electro-magnetic waves of automatic transmission vehicle is greater than -82dBm. The shapes of frequency spectrum of both engine room and passenger seat are look alike. But the level of electro-magnetic waves of manual transmission vehicle is less than -82dBm and the shapes of frequency spectrum of engine room and passenger seat are different to each other. From these results, we can say that any mal-function caused by electro-magnetic waves in the automobile cabin are only possible for automatic transmission vehicle. Also, it is believed that the radiating source of electro-magnetic waves is inside the vehicle. Thus, based on the transmission line theory, this paper presumably concludes that the cables which connect all the components inside a automatic transmission vehicle must be a radiating source of electro-magnetic waves in the cabin.