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.

리포트 - 연포장 업계의 HAPS(비산배출관리제도)

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

식도에 발생한 거대 해면혈관종 수술치험 - 1례 보고 -

이창민,박성달,조성래,허방,Lee, Chang-Min,Park, Sung-Dal,Cho, Sung-Rae,Huh, Bang 대한흉부심장혈관외과학회 1998 Journal of Chest Surgery (J Chest Surg) Vol.31 No.3

식도에 발생하는 혈관종은 식도에 드물게 발생하는 양성종양의 2% 내지 3% 정도 차지할 정도로 매우 희귀하여 세계적으로 보고된 증례수가 많지 않다. 저자들은 식도에 발생한 매우 희귀한 해면혈관종 1례를 수술치험하였기에 문헌고찰과 더불어 보고하고자 한다. 환자는 40세 남 米\ulcorner경미한 연하장애를 주소로 내원하여 식도조영술, 식도 내시경검사, 조영제를 이용한 흉부 전산화 단층촬영등을 시행하여 하부 식도의 점막하층에서 발생하여 근육층 밖으로 돌출되어 나온 식도 종양이 추정되어 수술을 시행하였다. 수술소견상 하부 식도 및 식도-위 문합부에 걸쳐 과혈관성의 7x7x3.5cm 크기의 거대한 종괴가 식도점막하층과 식도근육층 그리고 주위조직으로의 침범이 심하게 되어 있어 종양을 포함한 식도절제술 및 식도-위 문합술을 시행하여 병리 조직학적으로 해면 혈관종으로 확진되었으며 환자는 특별한 문제없이 술후 제14일째 건강한 상태로 퇴원하였다. Esophageal hemangioma is an extremely rare benign tumor that causes dysphagia and massive upper gastrointestinal bleeding. Although certain abnormalities seen on a barium swallow esophagography or at endoscopy may suggest an esophageal hemangioma, a contrast CT and radionuclide angiography using a blood-pool radiopharmaceutical can characterize the intense vascularity of the tumor. We experienced the ase of a 7$\times$7$\times$3.5 cm in size giant cavernous hemangioma of the lower 1/3 of esophagus in a 40 year old man. A mural cavernous hemangioma was diagnosed with a barium swallowed esophagogaphy, endoscopy, and a contrast CT. It was treated successfully by transthoracic esophagectomy including the tumor and esophagogastrostomy.

H₂S제거를 위한 아연계 탈황제 제조 및 반응특성 연구

이창민,윤여일,김성현,Lee, Chang Min,Yoon, Yea Il,Kim, Sung Hyun 한국공업화학회 1999 공업화학 Vol.10 No.2

Zinc-based sorbents for $H_2S$ removal were prepared. The reactivity of sorbents was investigated by the successive cycles of sulfidation-regeneration at $650^{\circ}C$ in a fixed bed reactor. The desulfurization sorbents were prepared with granulation method to produce a spherical pellet with good attrition resistance. The fresh and reacted sorbents were characterized by X-Ray Diffraction (XRD) and X-Ray Photoelectron Spectroscopy (XPS) and the characteristics of sorbents on calcination conditons were analysed by Mercury Porosimetery and BET. The reactivity of sorbents decreased as the number of sulfidation-regeneration cycle increased. It is due to the zinc loss and the increase of the diffusion resistance by sintering, cracking and spalling of sorbents at the high temperature. $H_2S$를 제거를 위한 아연계 복합금속산화물 탈황제를 제조하고 반응특성을 연구하였다. 최적 황화반응 온도인 $650^{\circ}C$의 고정층에서 탈황-재생의 연속 cycle에 따른 반응성을 관찰하였다. 내마모성 향상을 위한 구형입자의 탈황제를 제조하기 위해 Granulation방법을 이용하였다. XRD와 XPS분석에 의해 zinc titanate결정생성을 확인하였고 소성조건에 따른 탈황제의 특성을 분석하기 위해 mercury porosimetry와 BET분석을 행하였다. Cycle이 증가함에 따라 고온에서의 zinc loss와 sintering, cracking, 그리고 spalling에 의한 탈황제의 확산저항의 증가로 인해 반응성은 떨어졌다.

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.

IgA신장병 환자에서 발생한 호산구다발근염 1예

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

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

집배원 근골격계 질환 예방을 위한 수구분대 개선에 관한 연구

이창민,오연주,Lee, Chang-Min,O, Yeon-Ju 대한인간공학회 2004 大韓人間工學會誌 Vol.23 No.4

The purpose of this study is to redesign a letter sorting station and to present the optimal work-space through the ergonomic analysis of the sorting station for reducing the 'Work-Related MusculoSkeletal Disorders(WMSDs)'. We surveyed the work environment in terms of the reason causing WMSDs. According to the survey results, Deltoid on the arm, Trapezius on the shoulder and Erector Spinae on the waist are most frequent attacking parts. Accordingly, We classified sorting stations by the horizontal work-space(Level 1, Level 2, Level 3) and the vertical work space(Level 1, Level 2) based on the criteria of ergonomic optimal work-space. In addition we improved the sorting station through investigation and analysis of the work-load regard the each defined work-space. In order to analyze the effect of the horizontal and vertical work-space, subjects carried out simulated sorting tasks. Each level(Level 1, Level 2, Level3) of the horizontal work-space is significant regarding each muscles(the shoulder, arm and waist), and each level(Level 1, Level 2) of the vertical work-space is significant regarding the arm and waist, but not shoulder. Finally, we founded the difference of work-load according to the work-spaces. Then, it is necessary to improve the work-space causing the high work-load(Level 3 of the horizontal work-space). Then, this study presented the specification of a sorting station which is suitable to the korean body size, and constructed the 3D shaped model of the stations by the ergonomic analysis.

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

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.