• Journal of the Korea Institute of Information and Communication Engineering
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• v.25 no.7
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• pp.962-970
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• 2021

The cause of the majority of vehicle accidents is a safety issue due to the driver's inattention, such as drowsy driving. A forward collision warning system (FCWS) can significantly reduce the number and severity of accidents by detecting the risk of collision with vehicles in front and providing an advanced warning signal to the driver. This paper describes a low power embedded system based FCWS for safety. The algorithm computes time to collision (TTC) through detection, tracking, distance calculation for the vehicle ahead and current vehicle speed information with a single camera. Additionally, in order to operate in real time even in a low-performance embedded system, an optimization technique in the program with high and low levels will be introduced. The system has been tested through the driving video of the vehicle in the embedded system. As a result of using the optimization technique, the execution time was about 170 times faster than that when using the previous non-optimized process.

• Clinics in Shoulder and Elbow
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• v.13 no.2
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• pp.280-285
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• 2010

Purpose: Coracoid impingement syndrome refers to subscapularis impingement between the coracoid process and lesser tuberosity of the humerus, and pain may occur when the arm is positioned in forward flexion, internal rotation and adduction. This position is common for archers. Material and methods: A female archer with coracoid impingement syndrome that was uncontrolled by conservative therapy underwent arthroscopic subcoracoid decompression. At the 20th postoperative month of follow up, she complained of painful rotator interval widening and so she underwent arthroscopic rotator interval plication. Results: At the postoperative 6th month of follow up after the second operation, she showed no pain and good functional results, and she returned to competing as an archer. Conclusion: We have reported here on a case of successful treatment of painful rotator widening after subcoracoid decompression in an elite archer.

• KIPS Transactions on Software and Data Engineering
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• v.10 no.12
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• pp.561-568
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• 2021

In recent years, autonomous driving technologies have become a high-value-added technology that attracts attention in the fields of science and industry. For smooth Self-driving, it is necessary to accurately detect an object and estimate its movement speed in real time. CNN-based deep learning algorithms and conventional dense optical flows have a large consumption time, making it difficult to detect objects and estimate its movement speed in real time. In this paper, using a single camera image, fast object detection was performed using the YOLOv5 algorithm, a deep learning algorithm, and fast estimation of the speed of the object was performed by using a local dense optical flow modified from the existing dense optical flow based on the detected object. Based on this algorithm, we present a system that can predict the collision time and probability, and through this system, we intend to contribute to prevent tram accidents.

• Journal of the Korean Arthroscopy Society
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• v.5 no.2
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• pp.63-68
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• 2001

Purpose : To propose the diagnosis, 'hypertrophy of the anterior cruciate ligament(ACL)', and its clinical, radiological and pathological characteristics. Materials & Method : Since Dec. 1995, we have experienced 10 patients(12 knees) with hypertrophy of the ACL. There were 2 males and 8 females, and the age of the patients ranged from 35 to 67 years. Characteristics of clinical, radiological and pathological findings were analysed. Results : The chief complaint was insidious onset of dull pain on the knee which became worse with activity. The constant physical finding was painful limitation of full extension of the knee. Sagittal MR images showed diffuse swelling of the ACL, similar finding that could be seen in acute ACL tear. Arthroscopically, noted was a marked enlargement of the ACL causing notch impingement. Biopsies of the hypertrophied ACL showed increased collagenous tissue with variable degree of myxoid degeneration. With partial excision of the hypertrophied ACL with or without notchplasty, the symptoms improved in all. Conclusion : Hypertrophy of the ACL, a newly proposed diagnosis, should be considered be determining the cause of the painful knee, and further study should be done about its pathogenesis.

• Transactions of the Korean Society of Automotive Engineers
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• v.21 no.6
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• pp.8-15
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• 2013

Wide range frequency pulses occur in a car crash test. Until now, low frequency under 400Hz has been used to determine an airbag deployment criteria. Also, FIS (Front Impact Sensor) has been used to detect the crash pulse in early stage. Nowadays, technology to determine an airbag delpoyment criteria by using a high frequency crash pulse without FIS is being focused on. In this paper, the signal transmissibility of high frequency pulse for two different cars was studied. Also, signal transfer test of high frequency pulse was done by using a high speed ball impact. Signal runtime of the frontal impact is compared with that of the side impact. The signal transmissibility difference due to the car structure difference was discussed and structure change for improving the signal transmissibility was proposed.

• Proceedings of the KAIS Fall Conference
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• 2010.11b
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• pp.835-838
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• 2010

자동차 승객 안전에 대한 요구가 점차 확대 되어감에 따라 전방 충격으로부터 승객의 상해를 감소시키기 위한 각종 승객 안전장치 중 하나로, 에어백 시스템은 정면충돌 시 승객 사망률을 약 30%정도 저감시킬수 있다. 에어백은 충돌 시 일정한 힘 이상을 받게 되면 작동하도록 설계하여야 한다. 본 논문은 CATIA를 이용하여 3차원 설계를 하였으며, 해석 프로그램을 이용하여 사출성형품의 구조해석 및 사출 해석을 하여 최적화 하였다.

• Journal of Auto-vehicle Safety Association
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• v.4 no.1
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• pp.12-17
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• 2012

ADAS(Advanced Driver Assistance System) which is developed for alleviating driver's load has become improved with extending it's role. Previously, ADAS offered simple function just to make driver's convenience. However, nowadays ADAS also acts as Active Safety system which is made to release and/or prevent accidents. Longitudinal control system, as one of major parts of Active Safety System, is assessed as doing direct effect on avoiding accidents. Therefore, many countries such as Europe and America has pushed longitudinal control system as a government-wide project. In this paper, it covers the result of evaluation system and vehicle evaluation for development study in FCW, ACC and AEB.

• Transactions of the Korean Society of Automotive Engineers
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• v.12 no.5
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• pp.94-100
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• 2004

In order to improve the frontal crash performance of an Aluminum Space Frame Vehicle, this presents a systematic optimal design process to maximize the crush energy absorption capacity of side-members while satisfying the maximum displacement constraint. In this study, five design types are studied for selecting a good collapse initiator. Then, for the selected collapse initiator type, 7 design variables are defined to represent cross section shape, thickness and bead interval. The systematic optimization processor, R-INOPL uses DOE, RSM and numerical optimization techniques. R-INOPL uses only 14 analyses to solve the 7 design variable optimization problem the final design can improve 103.9% of the internal energy and reduce 13.9% of the maximum displacement.

• Proceedings of the Korea Information Processing Society Conference
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• 2022.11a
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• pp.845-847
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• 2022

교통사고의 원인 중 90%는 졸음운전과 같은 운전자의 부주의 때문에 발생하고 있다. 정부에서도 사고로 인한 인명피해 심각성을 인지하고 2019년부터 전방충돌방지 시스템과 차선이탈 경고 장치 등 ADAS(Advanced Driver Assistance Systems)를 의무적으로 적용하도록 규제를 강화하는 추세이다. 충돌사고를 예방하기 위해 본 논문에서는 영상처리를 기반으로 하여 객체 검출, 차간거리 측정, 후미등 검출, 차선 검출 기능을 적용하여 위험한 상황을 감지하고 운전자에게 경고 알림을 제공하는 System을 개발한다. 더 나아가 다양한 모빌리티 서비스에 이를 활용할 수 있는 방안을 제공한다.

• Journal of the Korean Arthroscopy Society
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• v.7 no.1
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• pp.7-9
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• 2003

전방십자인대 재건술시 이식건의 과간 절흔에 대한 충돌을 예방하기 위하여 어느 절도의 절흔 성형을 시행 할 것인가에 대하여는 아직까지 논란이 있으며 수술시 절흔의 형태, 골극 형성 유무, 이식건의 크기 경골 터널의 위치를 고려하여 시행하여야 한다. 절흔 후방의 골 제거가 과도하게 시행 될 경우에는 대퇴골 부착부가 외측으로 전위되어 슬관절의 생역학적 변화를 가져올 수 있고, 주변 관절 연골의 조기 퇴행성 변화를 초래할 수 있으므로 세심한 주의를 기울여야 하며 절흔 성형은 가능한 한 최소화 하는 것이 출혈, 동통 및 부종 등의 술후 합병증을 줄일 수 있다.