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신성근 대한마취과학회 1973 Korean Journal of Anesthesiology Vol.6 No.2
In a series of 50 patients (male 31, female 19) ketamine was used for various surgical procedures. The youngest patient was a 5 month infant undergoing skin graft and the oldest was a 62 year old woman undergoing removal of sutures. Ketamine was administered intravenously and intramuscularly by single or repeated doses, When administered I.V., at doses of 2 mg/kg, surgical analgesia was achieved within 60 seconds and lasted from 12 to 25 minutes. With I.M. doses of 7 mg/kg, surgical anesthesia was estabIished within 2 to 3minutes and lasted from 18 to 60 minutes. Ketamine anesthesia seems distinctly different from that induced by conventional anesthetic agents. The anesthetic state is characterized by profound analgesia combined with a peculiar state of unconsciousness in which the patient does not appear to be asleep or anesthetized but rather disconnected from his surroundings. Respiratory function of the anesthetized patient with ketamine is usually unimpaired and stimulation of the cardiovascular system results in moderate acceleration of cardiac rate and blood pressure although they gradually return to preinjection levels within a few minutes. Clinically it has become increasingly apparent that ketamine is an useful, safe and effective anesthetic agent for a variety of diagnostic and surgical procedures.
주행 중 타이어 손상에 의해 발생하는 초음파 포락선 신호의 펄스 간격 시간밀도함수에 의한 손상 분별
신성근,강대수 한국인터넷방송통신학회 2011 한국인터넷방송통신학회 논문지 Vol.11 No.3
주행 중인 차량의 타이어에서 발생하는 초음파 신호의 포락선에서 손상 물질에 의한 특징 신호의 주기를 검출하여 타이어 손상을 분별하는 방법을 연구하였다. 손상된 타이어는 주행 시 회전에 의해 주기성을 갖는 신호를 발생하기 때문에 이를 펄스화하고 펄스 간의 시간 간격을 밀도함수로 나타내어 우성 주기를 검출하였다. 펄스화하기 위한 임계값은 포락선 신호를 이동평균필터 처리하여 결정하였다. 손상물질이 한 개이고, 주행속도가 약 50km/h, 80km/h일 때, 시간밀도함수의 결과는 제 1 피크시간이 156ms, 102ms로 주행속도에 따라 계산한 타이어의 회전주기와 일치하였고, 한 개 이상의 손상물질의 경우에는 각 피크시간의 합이 타이어의 회전주기와 동일한 결과를 얻을 수 있었다. The tire damage classification method is researched by periodicity detection of ultrasonic envelope signals to occur at the driving vehicle tire. Because periodic signals is generated by rotations of the damaged tire, it should convert to pulse for using the density function. After time intervals of pulses are represented by the density function, the dominant periodicity is detected. The threshold to make a pulse is calculated by moving average of envelope signals. The result of time density function in case of one damage material, the first peak's time is equals to tire's rotation period, 162ms and 102ms, about the speed of 50km/h and 80km/h. In case of more than one damage material, the sum of each peak's time is equals to tire's rotation period about the speed.
MILS 기반 ADS 기능 검증을 위한 V2X 모델링에 관한 연구
신성근,박종기,우창수,예창민,이혁기 사단법인 한국자동차안전학회 2023 자동차안전학회지 Vol.15 No.3
Simulation-based virtual testing is known to be a major requirement for verifying the safety of autonomous driving functions. However, in the simulation environment, there is a difficulty in that all driving environments related to the autonomous driving system must be realistically modeled. In particular, C-ITS (Cooperative- Intelligent Transport Systems) is essential for urban autonomous driving of Lv.4, but the approach to modeling for C-ITS service in the MILS (Model in the Loop Simulation) environment is not yet clear. Therefore, this paper aims to deal with V2X (Vehicle to Everything) modeling methods to effectively apply C-ITS-based autonomous cooperative driving services in the MILS environment. First, major C-ITS services and use cases for autonomous cooperative driving are analyzed, and a modeling method of V2X signals for C-ITS service simulation is proposed. Based on the modeled V2X messages, the validity of the proposed approach is reviewed through simulations on the C-ITS service use case.
DECISION MAKING FOR COLLISION AVOIDANCE SYSTEMS CONSIDERING A FOLLOWING VEHICLE
신성근,이혁기,유승한 한국자동차공학회 2023 International journal of automotive technology Vol.24 No.2
In vehicles with driving assistance systems, the responsibility of driving still lies with the driver. Therefore, active safety systems follow a design principle of avoiding intervention as long as possible. Decision making using this principle requires collision avoidance with surrounding objects during the evasive maneuvering of an ego vehicle. However, general decision-making methods for collision avoidance focus on preventing collisions with objects in front of the subject vehicle; the risk of collision with the following vehicle caused by emergency braking is not considered. This paper presents decision-making methods for such collision avoidance systems, wherein emergency braking and steering are considered as collision avoidance maneuvers. The risk of collision is predicted based on the braking model of a normal driver and several emergency braking strategies are designed to avoid collisions. A within-lane steering avoidance method to improve avoidance performance in small overlap collision scenarios and a general avoidance method of steering to change lanes are designed. Collisions with surrounding objects can be avoided using the designed evasive maneuvers; further, maneuvers that can be implemented at the last moment are determined. The results of computer simulations indicate an improved collision avoidance performance using the proposed methods.