운전면허시험 강화에 따른 교통안전 효과 분석 연구

이창민,이철기,이상수,윤일수,Lee, Chang Min,Lee, Choul Ki,Lee, Sang Soo,Yun, Ilsoo 한국ITS학회 2020 한국ITS학회논문지 Vol.19 No.5

2011년 운전면허시험 간소화 제도가 도입된 이후 변별력이 없어 교통안전에 미흡하다는 부정적인 견해가 많았다. 이에 2016년 12월 22일부터 개선된 운전면허시험이 도입되었고 현재까지 운영되고 있다. 따라서 본 연구는 개선된 운전면허시험이 도입된 이후 어떤 효과가 있었으며 무엇이 유효했는지 살펴보고자 교통안전 통계자료 분석, 체감도 조사를 수행하였다. 분석 결과, 현재 시험이 적정한 변별력을 갖췄다고 보여 지며, 과거보다 공정성 체감은 상당 수준 올라온 것으로 인식된다. 실효성 부문에서는 아직까지 운전자의 눈높이를 만족하지 못한 것으로 사료되며, 향후에는 보다 심도 있는 연구와 교통선진국 사례를 검토할 필요가 있다. After the driver test was simplified in 2011, there were criticisms of its inadequate level of safety standards. A new and improved test was adopted in December 2016. This study investigated the impact of the changes to the test on safety, and analyzed traffic safety statistics and sensory evaluations to determine the effect of the improved driving license test. The analysis concluded that the current test has a proper discrimination and that fairness has increased considerably. The analysis also identified measures that, once adopted, will improve the conduct of driver tests. In the future, it will be necessary to conduct more in-depth studies and to review cases of advanced countries.

PSS 상 버퍼층 종류에 따른 GaN 박막 성장 특성 비교

이창민,강병훈,김대식,변동진,Lee, Chang-Min,Kang, Byung Hoon,Kim, Dae-Sik,Byun, Dongjin 한국재료학회 2014 한국재료학회지 Vol.24 No.12

GaN is most commonly used to make LED elements. But, due to differences of the thermal expansion coefficient and lattice mismatch with sapphire, dislocations have occurred at about $109{\sim}1010/cm^2$. Generally, a low temperature GaN buffer layer is used between the GaN layer and the sapphire substrate in order to reduce the dislocation density and improve the characteristics of the thin film, and thus to increase the efficiency of the LED. Further, patterned sapphire substrate (PSS) are applied to improve the light extraction efficiency. In this experiment, using an AlN buffer layer on PSS in place of the GaN buffer layer that is used mainly to improve the properties of the GaN film, light extraction efficiency and overall properties of the thin film are improved at the same time. The AlN buffer layer was deposited by using a sputter and the AlN buffer layer thickness was determined to be 25 nm through XRD analysis after growing the GaN film at $1070^{\circ}C$ on the AlN buffer CPSS (C-plane Patterned Sapphire Substrate, AlN buffer 25 nm, 100 nm, 200 nm, 300 nm). The GaN film layer formed by applying a 2 step epitaxial lateral overgrowth (ELOG) process, and by changing temperatures ($1020{\sim}1070^{\circ}C$) and pressures (85~300 Torr). To confirm the surface morphology, we used SEM, AFM, and optical microscopy. To analyze the properties (dislocation density and crystallinity) of a thin film, we used HR-XRD and Cathodoluminescence.

Clinical Hemodialysis Cases with Estimation of the Adequacy in Four Dogs

이창민,임채영,김승곤,강민희,박희명,Lee, Chang-Min,Lim, Chae-Young,Kim, Seung-Gon,Kang, Min-Hee,Park, Hee-Myung The Korean Society of Veterinary Clinics 2015 한국임상수의학회지 Vol.7 No.2

급성 또는 급성 악화 신장 손상으로 혈액투석을 위해 4마리의 개가 내원하였다. 모든 증례에는 난치성의 구토, 식욕 부진, 설사, 침울 등을 포함하는 요독증 증후군을 가지고 있었다. 기존의 일반적인 치료를 받았으나, 치료적 반응은 없었으며 심한 임상증상은 남아있었다. 4마리의 증례에서 간헐적 혈액투석(IHD)이 실시 되었다. 본 논문은 혈액투석을 실시한 4마리의 환자의 임상증상과 생화학적 특징을 Kt/V로 나타나는 투석 적절성에 대하여 기술하였다. 본 논문은 개에서의 혈액투석 치료의 표준화의 설정에 도움이 되기 위하여 실제 증례에서 투석 적절성을 평가하였다. Four cases of acute or acute-on-chronic kidney injury were referred for hemodialysis therapy. All cases had a history of uremic syndrome including refractory vomiting, anorexia, diarrhea and depression. They already had been treated with conventional therapies but the intractable clinical signs were remained without response of medications. Intermittent hemodialysis (IHD) sessions were executed in four cases. This study describes the clinical signs and biochemical features of four hemodialysis patients with dialysis adequacy indexed by Kt/V. This report introduced the estimation of hemodialysis adequacy method with clinical cases for establishment of standardization of hemodialysis therapy assess in dogs.

상호안전성을 고려한 차대차 정면 충돌 안전성 선행 연구

이창민,신장호,김현우,박건호,박영준,Lee, Chang min,Shin, Jang ho,Kim, Hyun woo,Park, Kun ho,Park, Young joon 한국자동차안전학회 2017 자동차안전학회지 Vol.9 No.1

In recent years, NCAP regulations of many countries have induced automaker to improve the vehicle crashworthiness. But, the current NCAP regulations don't cover all types of traffic accidents. And rapid-increasing market share of compact cars and SUVs has brought for both consumer and automaker to pay more attention on crash compatibility. So, many countries have tried to develop the new crash test mode and update the present crash test mode. Especially, Euro NCAP has been developing a new impact protocol of the car-to-car frontal offset impact including the crash compatibility assessment. There are plans to introduce this new protocol in 2020, and it will be replaced the current Euro NCAP frontal offset impact. The test dummy in the front seats of this new test mode will be changed from 50% Hybrid-III male to 50% THOR male. This paper will address the vehicle responses, the occupant responses and the vehicle compatibility performance from a full vehicle crash test using the new car-to-car frontal offset test protocol of Euro NCAP.

추돌시 Head Restraints 시스템의 구속 효과와 인체 상해에 관한 연구

이창민,Lee, Chang-Min 대한인간공학회 1998 大韓人間工學會誌 Vol.17 No.3

Focuses of this study are to investigate the usage status of head-restraint system(H/R) in usual driving and to simulate usage conditions of H/R at rear-end crashes. The usage of H/R was categorized into five classes according to the height and distance from occupant's head ; Large-$90^{\circ}$ H/R for enough height and short distance. Large-$70^{\circ}$ H/R for enough height and long distance. Small-$90^{\circ}$ H/R for low height and short distance. Small-$70^{\circ}$ H/R for low height and long distance. and No H/R. Then. these five conditions were tested to find out the degree of neck injuries by using a car-crash simulation package, DYNAMAN. Results from the investigation of H/R usage show that most of drivers(60%) have Small-$70^{\circ}$ H/R for low height and long distance. Results from the simulation performed at 15mph and 30mph show that: 1) at 15 mph, there is a possibility for neck injury in Small-$90^{\circ}$ H/R and Small-$70^{\circ}$ H/R. 2) at 30 mph. there is a high possibility of death in Small-$70^{\circ}$ H/R and Small-$90^{\circ}$ H/R.

생체역학적 분석을 통한 보행 부하 감소용 인솔 개발

이창민,오연주,Lee, Chang-Min,Oh, Yeon-Ju 대한인간공학회 2005 大韓人間工學會誌 Vol.24 No.4

The mailman's shoes should be designed in due consideration of occupational features they spend most of times to walk. For that reason, the shoes required functions to reduce the foot fatigue and to protect body by dispersing the body weight to the whole foot. In this research, for the functional improvement of the insole, insoles are investigated and analyzed by biomechanics experimentation. Under the base of these experimental results, we develop insoles that can reduce the body load and muscular-skeletal disorder. The pressures are concentrated on the metatarsus and heel by the result of analyzing pressure distributions of the using shoes. Accordingly, we offer the prototype functional insole that is ranked from high pressure to low pressure on the base of a shock absorb function. This prototype functional insole is examined for statistical significance by pressure distribution areas. The experimental results show that pressure areas are dispersed to whole foot, for this reason, pressures of the metatarsus and heel are reduced. Results of this research can not only improve the function of insoles which is suitable for occupational features, but also be a base on constructing data bases for biomechanics gait insoles.

급성 특발성 양측성 아래눈꺼풀겉말림 1예

이창민,곽미선,박대진,Chang Min Lee,MD,Mi Sun Kwak,MD,PhD,Dae Jin Park,MD 대한안과학회 2010 대한안과학회지 Vol.51 No.1

Purpose: Ectropion is an eversion of the eyelid due to various causes, and it mainly develops in the lower lid. Usually it shows a slow progression, and it is classified as involutional, cicatricial, paralytic and congenital. Acute idiopathic bilateral lower lid ectropion is very rare; few cases have been reported worldwide, and none have been seen in Korea. Case summary: A 79-year-old male patient visited our department with a six-day history of epiphora and lower lid eversion in both eyes. On slit-lamp examination, lower lid ectropion was present in both eyes, and mild corneal punctate epithelial erosion was also observed. Two weeks after conservative treatment, the lower lid eversion disappeared and the lower lid returned to its original position. No changes were observed three months after treatment. We report a case of acute idiopathic bilateral lower lid ectropion with a literature review. J Korean Ophthalmol Soc 2010;51(1):126-130

망막질환이 동반된 난치성 녹내장에서의 유리체절제술과 평면부를 통한 아메드장치삽입술

이창민,김은아,조영욱,Chang Min Lee,Eun Ah Kim,Young Wook Cho 대한안과학회 2011 대한안과학회지 Vol.52 No.1

Purpose: To evaluate the efficacy and long-term prognosis of pars plana vitrectomy and Ahmed valve implantation for intractable glaucoma comorbid with retinal disorders. Methods: A retrospective review of 34 eyes of 30 patients receiving pars plana vitrectomy and Ahmed valve implantation for intractable glaucoma comorbid with retinal disorders was performed. Preoperative and postoperative intraocular pressure (IOP) and visual acuity, the usage of IOP-lowering medications and postoperative complications, and surgical success rate were evaluated. Results: IOP and the number of IOP-lowering medications showed a significant decrease after pars plana vitrectomy and Ahmed valve implantation, as compared to before surgery (p < 0.001). The success rate was 88%, 88%, 84% and 85% postoperatively at 1 month, 6 months, 1 year and 3 years respectively. The mean follow up period was 24.21 ± 14.99 months. Complications related to surgery included hyphema in 2 eyes, recurrent corneal epithelial erosion and defect in 2 eyes, corneal ulcer in 2 eyes and vitreous hemorrhage in 4 eyes. Visual acuity improved in 14 eyes (41.1%), no changes in 13 eyes (38.2%) and decreased in 7 eyes (20.6%). Conclusions: Pars plana vitrectomy and Ahmed valve implantation for intractable glaucoma comorbid with retinal disorders show long-term efficacy in lowering IOP. J Korean Ophthalmol Soc 2011;52(1):46-52

리포트 - 연포장 업계의 HAPS(비산배출관리제도)

이창민,Lee, Chang-Min (사)한국포장협회 2016 包裝界 Vol.277 No.-

IgA신장병 환자에서 발생한 호산구다발근염 1예

이창민,Lee, Chang-Min 대한임상신경생리학회 2015 Annals of Clinical Neurophysiology Vol.17 No.2