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박원일(Wonil Park),김용석(Yongseok Kim),박기수(Kisoo Park),이석기(Sukki Lee) 한국산학기술학회 2021 한국산학기술학회논문지 Vol.22 No.12
야간 악천후의 도로 환경은 운전자가 안전한 주행환경을 유지하기에 많은 시각적 제약이 있다. 특히, 주행 차선의 시인성이 저하되면 차량이 차로를 이탈하고 교통사고가 발생하기도 한다. 일반적으로 차선에 유리알 비드(Bead)를 살포한 후 재귀반사 효과를 통해 차선의 시인성을 확보하고 있으나, 야간 및 악천후 시에는 효과가 적고 일정 시간이 경과하면 그 성능은 급격하게 저하된다. 따라서, 국내외에서는 야간 악천후 시 차선의 시인성을 확보하기 위해 발광형 차선을 개발하고 있다. 그러나 이에 대한 검증은 부족한 실정이며 특히, 운전자에게 가장 위험한 환경인 야간 악천후 환경에서의 성능 검증은 거의 전무하다. 따라서, 본 연구에서는 실규모의 야간 악천후 환경을 구현하고 다양한 외부 조명 조건에서 일반 차선 대비 발광형 차선의 성능을 휘도 값 비교를 통해 검증 하였다. 그 결과로 백색차선과 발광형 차선의 휘도 차이는 최대 4.65cd/㎡를 보였다. 또한, 발광형 차선은 백색차선 대비 악천후 시 휘도 감소율이 낮았으며, 외부조명이 전혀 없는 경우에도 일정 휘도 값을 보여 종합적으로 야간 악천후 시 백색차선 대비 높은 휘도 성능을 보였다. Driving at nighttime is a difficult task for drivers mainly due to visual restrictions. In particular, higher accident risk at nighttime compared to daytime explains this difficulty. Especially, a lowered visibility of pavement markings leads to run-off-the road accidents. A conventional pavement marking utilizing a glass bead with the retro-reflecting mechanism has been widely used in practice. However, the loss of a considerable portion of glass beads with time diminishes the visibility dramatically leading to serious problems. Recently, luminescent lane marking has been under development to overcome the problems associated with glass bead markings by fertilizing the physical property of the luminescent. However, the validation of visibility robustness of a luminescent lane under adverse weather conditions needs to be performed to derive its superiority over conventional markings. To this end, this study simulated real scale weather proving ground and tested the performance of a luminescent lane by measuring the luminance. The results suggested that the luminance difference between conventional and luminescent markings was 4.65 cd/㎡. In addition, luminescent markings showed higher performance in terms of reduction rate due to adverse weather. Under worst-case scenarios such as roads without lightings and vehicle headlights, luminescent markings provided higher luminance than pavement. Moreover, no difference was observed between conventional lane marking and a pavement background. It means that the safety margin was attained in the luminescent marking condition even under worst-case road-illuminated conditions.
Benign Epilepsy of Childhood with Centrotemporal Spikes
박원일(Wonil Park),한상주(Sang Ju Han),이홍진(Hong Jin Lee),이경자(Kyung Ja Lee) 대한소아신경학회 1993 대한소아신경학회지 Vol.1 No.2
Objective. To identify the short-term prognostic factor, and also assess the clinical and EEG changes following treatment. Patient and Method. We reviewed the medical record of 24 patient who followed up more than 12month, and compared seizure control rate as a pedictor according to sex, age at onset, seizure type, ferequency. BECCT was diagnosed as following criteria: 1) nocturnal seizures or hemifacial seizure on wakening state, 2) normal intelligence and no abnormal neurologic sign, 3) normal EEG background activity with monomorphic sharp or spike acticity which increase the frequence during sleep if sleep EEG was available. Result. 1) Age at onset was range from 3 years to 11 years (7.1±1.9) and Patient were followed up from 12 month to 92 months.(34.8±25.1) 2) Seizure was free in 54.2% of patients 1 month after therapy, in 75.0% 6 month after, in 83.3% 1 year after, in 95.8% 2 year after. We found that seizure frequence before treatment was the most important predictor ( P < 0.05 ), and also found that male, older age at onset had more fovorable outcome of prognosis during follow up. 3) Partial seizures were increased from 54.2% before therapy to 83.2% after therapy and seizure pattern tend to become localized to the face.( P < 0.05). 4) Epileptiform discharge did not disappear from the EEG during short-term follw up. Conclusion. Although BECCT recurred frequently during short-term follow, BECCT has not only an excellent long term prognosis bu also mild seizure localized to the face following treatment. It would be better to avoid heavy dose of AED or polytherapy, and we found the age onset, frequence of seizure as predictor of the seizure relapse.
위드코로나 이후 재개된 학교체육수업에서 츄크볼이 과체중 아동의 신체구성, 혈압, 조직의 산소포화도 및 체력에 미치는 영향
박원일 ( Wonil Park ),이재성 ( Jaesung Lee ),이준희 ( Joon-hee Lee ),장덕진 ( Deok-jin Jang ) 중앙대학교 학교체육연구소 2022 Asian Journal of Physical Education of Sport Scien Vol.10 No.3
본 연구에서는 코로나 팬데믹 상황으로 인해 신체활동량이 부족한 초등학생을 대상으로 6주간 학교 체육수업 츄크볼(Tchoukball)을 실시 했을 때 신체구성, 체력 및 산소포화도에 미치는 영향을 검증하고자 한다. 본 연구의 대상자는 남녀 초등학생 43명으로 선정하여 정상체중 집단 27명, 과체중 집단 15명이 본 연구에 참여하였다. 두 집단 모두 츄크볼 운동을 6주간 주 3회 45분을 실시하였으며 사전과 사후에 신체구성, 혈압, 산소포화도 및 체력(PAPS)을 측정하여 츄크볼이 미치는 영향을 확인하였다. 그 결과, 두 집단 모두 사전과 사후에 신체구성과 산소포화도의 변화는 나타나지 않은 반면, 정상체중 집단은 수축기 혈압이 유의하게 감소하였고 집단 간 상호작용이 나타났다. 과체중 집단은 15m 왕복달리기, 제자리 멀리 뛰기가 유의하게 증가하였으며, 15m 왕복달리기는 집단 간 상호작용의 효과가 나타났다. 본 연구의 결과를 종합하면, 6주 동안 츄크볼 운동이 과체중 초등학생에게 15m 왕복달리기, 제자리 멀리 뛰기 향상에 기여하였지만, 신체구성과 산소포화도의 개선에 큰 영향을 미치지 못한 것으로 판단된다. This study aims to verify the effect of Tchoukball in physical education classes for 6 weeks on body composition, blood pressure, oxygen saturation, and physical fitness for elementary school students who were physical inactivity due to the COVID-19 pandemic. The subjects were 43 male and female elementary school students, and 27 normal-weight groups and 15 overweight groups participated in this study. In both groups, chukball was conducted three times a week for 45 minutes for six weeks. Body composition, blood pressure, oxygen saturation, and physical fitness were measured before and after chukball intervention. As a result of this study, changes in body composition and oxygen saturation were not showed in both groups before and after, while the normal-weight group significantly decreased systolic blood pressure and showed interaction between groups. In the overweight group, 15m shuttle-run and long jump in place significantly increased, and 15m shuttle-run showed the effect of interaction between groups. In summary, it is judged that the chukball exercise for 6 weeks contributed to improving the 15m shuttle-run and the long jump in place for overweight elementary school students, but did not have a significant effect on the improvement of body composition and oxygen saturation.
Benign epilepsy of childhood with centrotemporal spikes에서 간질성 발작파 초점의 발생위치
임연성(Youn Sung Lim),박원일(Wonil Park),윤혜선(Hae Seon Yun) 대한소아신경학회 1994 대한소아신경학회지 Vol.2 No.1
Background: Although benign epilepsy of childhood with centrotemporal spikes ( BECCT ) is an electroclinical syndrome originally based on EEG epileptiform discharges localized to the centrotemporal area, the occurrence of typical clinical manifestations in chidren with atypical foci have been reported by several authors. The aim of this study was to identify the importance of the epileptiform discharge location in BECCT. Method: We reviewed EEGs from children whose history and clinical manifestation compatible with BECCT to identify the occurrence of typical clinical manifestation in patient with atypical foci of epileptiform discharge. Result: 1) The age of seizure onset were 3 to 13 years old (mean.7.3 ) and male to female ratio was 1.2 : 1. 2) 22.0% of patients had more than two independent epileptiform discharge foci. 3) 78.1% of patients with single focus had typical central and midtemporal foci, and 21.9% had atypical poci, and epileptiform discharge foci were central(40.6%), midtemporal(37.5%), parietal (15.6%),occipital(3.1%), frontal(3.1%) inorder of frequency. 4) Although atypical foci revealed in younger age group, there was no static significance (P>0.1). We conclude that the normal background features, the typical morphology of epileptiform discharge, and the activation by sleep are the typical EEG features of this syndrome, and the cases should not be exclude who demonstrate typical features of BECCT except centrotemporal location of epileptiform dischage.