• Journal of Advanced Navigation Technology
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• v.24 no.3
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• pp.163-172
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• 2020

Flight data recorder (FDR) for accident investigation is required to comply with EUROCAE(ED-112) standard so that flight data can be restored when exposed to extreme conditions due to aircraft crash. Since the ED-112 standard defines the general requirements for all aircraft, it is essential to analyze detailed requirements for FDR software to apply appropriate requirements selectively according to the configuration and operation concept of a specific aircraft. In this paper, the software requirements applicable to unmanned aircraft will be analyzed and the FDR software design will be proposed. Also, a software verification method for each requirement will be presented to verify that the implemented software is designed to satisfy all requirements.

• Elastomers and Composites
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• v.52 no.3
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• pp.167-172
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• 2017

Ultra-high performance (UHP) tires, for which demand has recently surged, are subject to severe strain conditions due to the low aspect ratio of their sidewalls. It is important to ensure sidewall material durability, since a sudden tire sidewall breakage during vehicle operation is likely to cause a major accident. In the automotive application of rubber parts, cracking is defined as a failure because when cracks occur, the mechanical properties of rubber change. According to Mars, Andre et al., strain and strain energy density (SED) are mainly used as a failure parameters and the SED is generally used as a fatigue damage parameter. In this study, the fatigue life curves of sidewall rubber of tires were determined by using the SED as fatigue damage parameter while the effect of aging on fatigue life was evaluated after obtaining the SED-Nf curves according to aging condition.

• Journal of Korean Foot and Ankle Society
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• v.11 no.1
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• pp.111-114
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• 2007

Open calcaneal fracture with more than lateral half of bone loss and soft tissue defect occurred in 17 year-old male patient due to motor vehicle accident. Soft tissue defect included heel pad, peroneal tendon. Bone loss involved mainly most part of inferior tuberosity but not subtalar joint. Open dressing and debridement were done daily in operating room and antibiotics administration was started. After granulation tissue formed, femoral head allograft was performed and fixed with 6.0 mm screws to replace bone defect. Soft tissue defect was covered with latissimus dorsi musculocutaneous free flap. No sign of infection nor major osteolysis was observed in 15 months follow up period. Soft tissue defect was covered with latissimus dorsi musculocutaneous free flap.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2005.11a
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• pp.471-474
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• 2005

For the purpose of objective and scientific inspection, traffic accidents should be appraised and inspected by righteous material evidences, computer simulation, and studies such as automobile engineering, traveling and collision accident dynamics, road and traffic engineering. In this paper, it displays the results of studying cases with the reasons of traffic accidents by analyzing and studying automobile kinetics, real traffic accidents and the results of in scientific and objective ways. In this paper, it is proved that with compared by dry and wet road surface condition, the transient brake time of wet condition is longer than dry road condition. Moreover, compared with unpacked road condition and packed road condition. unpacked road condition is shorter than packed road condition using computer simulation.

• Korean Journal of Health Education and Promotion
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• v.10 no.1
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• pp.61-71
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• 1993

Pedestrian injury have been the most important cause of death in children 1 to 14 years of age. This study was attempted to analyze the status and factors of the pedestrian safety education for primary school children. The purpose of this study was to provide the baseline study on pedestrian safety education. The data were collected from 313 respondents of 5th grade elementary school children in Seoul during April 26 through May 6, 1993. The data were cross tabulated for percent distribution and analyzed by multiple regression using SAS for personal computer program package. Major findings are as follows: (1) 50% of the respondents had never received any safety education for Pedestrian. The primary provider of pedestrian safety education was parent. (2) Respondents' knowledge on traffic rules, traffic signals, natures of motor vehicle is high(above 88%). (3) Respondents are very negative to the attitude of playing on the street and transversing under d1e overpass(about 80%). (4) 58% of respondents had never played on the street and 49% of respondents had never run on the street. (5) Factors affecting the knowledge of traffic safety was respondents' sex and job of their mothers(p＜0.05). (6) Factors affecting the attitude of traffic safety was economic status(p＜0.01). (7) Factors affecting the practice of traffic safety was education of respondents' fathers. (8) The multiple regression analysis showed that sex was statistically significant in affecting traffic accident of pedestrians (p=0.05). In order to prevent children's traffic accidents, education for pedestrians' safety by both parents and teachers should be strengthened.

• Archives of Reconstructive Microsurgery
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• v.11 no.1
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• pp.47-52
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• 2002

One of the most common problems in cord injury is pressure sores. In the early stage of pressure sores, the wound can be covered by advancing or transpositioning a local myocutaneous flap. However, it can be a great challenge to treat end-stage paraplegic patient who underwent multiple prior flaps, where continuous treatment is needed to prevent recurrent pressure sore due to infection and metabolic drain. In these patients, a local myocutaneous flap may be very difficult for coverage of the wounds. Therefore, hemipelvectomy may be considered. The authors performed a hemipelvectomy on a 33 year-old male paraplegic patient who presented with multiple, large wounds seen in end-stage pressure sores. He had a compression fracture of the lumber spine 9 years ago during a motor vehicle accident. After a wide exicision of the wound, the anterior flap was used as a fillet-flap for reconstruction. On the sixth day postoperatively, secondary repair was done due to wound dehiscence and the postoperative results have been satisfactory thus far.

• Journal of Trauma and Injury
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• v.33 no.1
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• pp.48-52
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• 2020

Composite skull defects in patients with severe head injuries are very challenging to manage. The dilemma when deciding whether to perform a definitive reconstruction is how long to wait for physiological recovery before an intervention complicates the situation. The inability of such patients to tolerate prolonged anesthetic exposure is a driving factor for performing the minimal intervention necessary to facilitate recovery. Herein, we present a case involving the successful immediate reconstructive treatment of a severely head-injured adolescent with a composite scalp defect secondary to trauma. A 14-year-old boy sustained a severe head injury from a motor vehicle accident with a composite scalp defect in the right fronto-parietal region. The frontal lobe was exposed, and the right eye was crushed and devitalized. The patient was deeply unconscious for 3 days, without any significant improvements before reconstructive surgery was proposed due to fear of possible meningitis resulting from the exposure of brain structures. We successfully managed the patient with a fronto-parieto-occipital flap, after which the patient promptly recovered consciousness.

• Journal of Korean Society of Transportation
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• v.27 no.3
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• pp.39-47
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• 2009

Currently, the minimum breadth as a point available for U-turn setup is designated as "over 9m for one way" in the traffic safety facilities practical manuals, and vehicles allowed to make a U-turn are limited to passenger cars. However, as passenger cars have recently become larger and SUVs (Sports Utility Vehicles) are being popularized, they fail to make a U-turn in one attempt. This causes a traffic jam and a problem with traffic safety. This study proposed, compared, and tested the measured values of actual differences in the turning radius of U-turn by actual cars with estimated values by using PC-Crash, a car accident simulation program. Then, the study forecasted the turning radius of U-turns of Korean passenger cars by using PC-Crash, and proposed appropriate breadth for U-turn setup.

• The Korean Journal of Emergency Medical Services
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• v.7 no.1
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• pp.135-146
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• 2003

The purpose of this study was to improve EMS-System in Korea through the research in EMS-System of advanced country. The response time is defined as the interval from the time of call receipt to the time of scene arrival. The important factor was to shorten moving distance of ambulance. It should be considered to accomplish this factor that the vehicle must be increased and the convenient location chosen for optimizing of service area. The transport of emergency patients carried out almost by 119 Emergency Medical Service but out of all the employees at 119 EMS only 11.3% have own qualified EMT degree. They should be employed more and more specially at 119 EMS for a superior level of emergency medical care for civilian. In America, EMT can take care of emergency patients following the order from medical Director at the scene of accident. But in Germany, prehospital care was emphasized from the beginning and, in those days, a medical doctor was sent for treatment of emergency patients at the scene, the so-called a Rendezvous system. Hierby this study makes the suggestion to improve the EMS-System, it is effective to use the medical Director system in America and furthermore a Rendezvous system in Germany. The functional integratin and unification of the report system as well as enough personal and equipmental elements saved together invaluable lives.

• Journal of Korean Neurosurgical Society
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• v.29 no.8
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• pp.1050-1054
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• 2000

Objective : The incidence of head injury has been increasing in the rural area. The author investigated the clinical features and difficulties in care of the acute head-injured patients in this area. Method and Material : The authors performed a retrospective review of radiological data and clinical records in patients with mild to moderate head injury. Cause, type of craniocerebral injury, delayed intracranial lesions, complications, its relation to alcohol abuse, and outcome were analyzed. Results : In total of 68 cases, 20(29.4%) victims were associated with acute alcohol intoxication. Motor vehicle accident was the leading cause of head injury and the most common craniocerebral lesion was basilar skull fracture. Eight(11.8%) patients showed delayed radiological and clinical deterioration and 40(58.8%) were followed-up regularly after discharge. The subdural hygroma was commonly noted in the elderly and alcoholics. Causes of thirty events that resulted in an atypical and difficult neurosurgical practice were as follows : delayed admission, premature discharge against doctor's request, refusal of radiological studies and admission, misunderstanding of disease entity, and unreasonable desire of transfer to tertiary hospitals. Inaccurate initial diagnoses were made by emergency doctors in twenty patients. During the course of treatment, there were a few complications such as alcohol withdrawal, acute otitis media, cerebrospinal fistula, facial weakness, and posttraumatic seizure. Outcome was good in 60(88.2%) patients. Conclusion : Most of minor head trauma patients in this series have shown good results, but we have to consider some possible complications and delayed intracranial lesions in these patients that should be managed with special cautions with various kinds of treatment difficulties.