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무기계 상변환 콘크리트 수화열 저감재의 내조해성 및 상변이 안정성 향상 기술 개발
길배수 ( Kil Bae-su ),박용순 ( Park Yong-soon ),강용식 ( Kang Yong-sik ),이지연 ( Lee Ji-yeon ),김규용 ( Kim Gyu-yong ) 한국구조물진단유지관리공학회 2020 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.24 No.2
최근 대단위 규모의 초고층 건축물 시공 등이 아시아 지역 국가에서 시행되고 있으며, 콘크리트의 고성능 및 고강도화에 따른 단위시멘트량이 증가함에 따라 콘크리트 구조체에서 수화열에 의한 온도 균열의 위험성이 매우 증가하고 있다. 이를 해결하기 위한 방법으로 무기계 상변환 소재 기반 수화열 저감재를 활용하는 기술을 사용하고 있으나 소재의 조해성으로 장기 저장 기간의 제약과 품질저하의 문제점이 있다. 따라서 본 연구에서는 안정화조제를 이용하여 무기계 상변환 콘크리트 수화열 저감재의 내조해성 및 상변이 안정성 향상 기술을 개발하고자 한다.
최택영,박용길,조원종,Choi Taeg Young,Park Yong Kil,Cho Won-Jong 한국학교수학회 2005 韓國學校數學會論文集 Vol.8 No.2
본 연구는 중등학교 수학 수업에서 컴퓨터 보조수업의 활용실태를 알아보고, 컴퓨터 보조수업에 대한 수학교사와 학생들의 인식을 조사하기 위하여 설문지를 통하여 분석하였다. 연구 결과 수학 수업에서 컴퓨터 보조수업의 교육적 효과 및 필요성은 인식하고 있음에도 불구하고, 그 활용은 미흡한 것으로 나타났다. 컴퓨터 보조수업의 활성화를 위해서는 다양한 코스웨어의 개발, 컴퓨터 사용 환경개선 및 교사 연수 등에 대한 지속적인 지원과 관심이 필요한 것으로 드러났다. This study is aimed at checking on the extent of practical use of CAI in mathematical classes in secondary schools, thus seeking a way of activating the practical use of CAI, with computer networks being widely used for education. This research was conducted among some 120 mathematics teachers and 350 students in middle and high schools in the City of Kunsan, with questionnaires designed to survey the extent and effectiveness of the use of CAI, the teachers and students' awareness of CAI. In consequence, this research shows the following: The use of CAI was of considerable help in conducting mathematics classes, along with CAI used in a more effective way, but education materials concerning CAI were poorly managed and not a few teachers was negative toward the use of CAI in mathematics classes. In short, the practical use of CAI was unsatisfactory, probably due to the lack of application ability on the part of teachers caused by the perfunctory teachers' training. In conclusion, the practical use of CAI in classes can be activated as follows: CAI apparatuses and other teaching aids should be systematically managed by experts; high-quality CAI programs need to be developed to help teachers conduct effective classes; teachers should be positively encouraged to make practical use of CAI through teachers' training and a plan of obligating teachers to use CAI for one or two fixed class hours in a week may be strongly recommended.
미만성 척수 경막외 농양을 동반한 화농성 척추염 - 증 례 보 고 -
김훈,김성민,정대진,심영보,박용기,최선길,Kim, Hun,Kim, Sung Min,Chung, Dai Jin,Shim, Young Bo,Park, Yong Kee,Choi, Sun Kil 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.8
We report a case of pyogenic spondylitis on L2 and L3 with diffuse epidural abscess up to T4 to L3 and large psoas abscess. A forty-nine-year old male was presented with progressive back pain, left flank pain and ab-dominal distention, weakness of the both legs and voiding and defecation difficulty during last 2 months. Initially multiple coronal hemilaminectomies from T4 to T12 were done for the treatment of diffuse thoracic epidural ab-scess. Then second operation via left retroperitoneal approach was performed for lumbar spondylitis and psoas abscess on third day after initial operation. After removal and curettage of pyogenic psoas and epidural abscess and spondylitis (L2-L3), iliac bone grafting with Keneda instrumentation from L1 to L4 was done simultaneously. Postoperative course has been unevenful without recurrent infection. The literature on diffuse epidural and large psoas abscess with pyogenic spondylitis are reviewed and instrumentation for stabilization of pyogenic spondylitis is also discussed.
외상성 척수공동증의 치료를 위한 지주막하강 재건술 - 증례보고 -
정대진,김성민,김훈,심영보,박용기,최선길,Chung, Dai Jin,Kim, Sung Min,Kim, Hun,Shim, Young Bo,Park, Yong Kee,Choi, Sun Kil 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.2
The authors report a posttraumatic syringomyelia in a 30-year-old man who has complained pain, weakness of upper arm and dissociation sensory loss since 2 months before. He was underwent by decompressive laminectomy from T12 to L1, reduction of encroached bony fragments, transpedicular screw fixation from T12 to L2 and posterolateral bony fusion due to burst fracture of L1 at other hospital 3 years ago. Preoperative spinal MRI was highly suggestive of wide-spread, multiseptated syringomyelia from C3 to thoracolumbar junction. We performed wide decompressive laminectomy from T10 to L2 and subarachnoid space reconstrucion composed of microdissection of meningeal fibrosis widely, iatrogenic meningocele formation with lefting the dura mater opened for treatment of spinal-spinal pressure dissociation. Clinical manifestations and radiological findings of the patient were improved after the operation. This technique was thought to be superior to shunting procedures in cases of wide-spread, multiseptated post-traumatic syringomyelia.
선정된 관측구간의 교통량 기반 추정 기종점 OD행렬의 추정력 비교
이현주(Lee, Hyeon-Ju),이승재,박용길(Park, Yong-Kil) 대한교통학회 2004 대한교통학회 학술대회지 Vol.46 No.-
관측구간의 교통량으로부터 기종점 OD행렬1)을 추정하는 방법은 과거의 사전(prior) 기종점 OD행렬과 관측된 구간교통량과의 인과관계를 설정하여 관측구간 교통량으로부터 기종점 OD행렬을 추정한다. 구간(링크)상에서 관측되는 모든 정보는 똑같은 정보를 갖고 있지는 않으며, 어떤 관측구간2)의 교통량은 기종점 OD행렬을 추정하는데 효과적인 정보를 제공하지 못할 수 있다. 즉, 교통량관측구간을 무작정 증가시킨다고 해서 추정 기종점 OD행렬의 추정력이 높아지고 관측오차가 낮아진다고 볼 수는 없을 것이다. 때문에, 기종점 OD행렬의 추정의 정확도를 높이고 관측비용(검지기수)을 줄이기 위해서는 적정한 관측구간을 선정하여 기종점 OD행렬을 추정하여야 한다. 적정한 관측구간은 분석대상지역내의 모든 기종점 OD행렬쌍을 최소한으로 관측할 수 있어야 한다. 왜냐하면 어떤 특정한 기종점 OD행렬쌍이 관측되지 않으면 그 OD행렬쌍의 추정 교통량은 신뢰성이 낮아질 수 있기 때문이다.
중대뇌동맥 동맥류 파열 환자의 출혈 양상에 대한 임상적 분석
김훈,심영보,황형식,최재준,김성민,박용기,최선길,Kim, Hun,Shim, Young Bo,Hwang, Hyung-Sik,Choi, Jae Jun,Kim, Sung Min,Park, Yong Kee,Choi, Sun Kil 대한신경외과학회 2001 Journal of Korean neurosurgical society Vol.30 No.6
Objectives : The rupture of middle cerebral artery(MCA) aneurysm usually cause or is associated with higher incidence of intracerebral hemorrhages(ICH) than any other aneurysmal ruptures. Also, the outcome of patients who had ICH is known to be worse than patients who had subarachnoid hemorrhage(SAH) only. The authors report the bleeding pattern and outcome of ruptured MCA aneurysm patients. Patients and Methods : A total 106 ruptured MCA aneurysm patients who were surgically treated were included and they were divided into 2 groups by the initial brain CT findings according to the presence or absence of ICH over 10cc in amount. The clinical data were analysed retrospectively. Results : The overall mortality was 18.9%. Among 81 patients(76.4%) who had subarachnoid hemorrhage(SAH) only, 68 patients(84%) showed favorable outcome. Twenty five patients(23.6%) had ICH over 10cc in amount with or without SAH, and among them, 11 patients(44%) showed favorable outcome. The ICH was located in temporal lobe(15 patients, 60%), frontal lobe(3, 12%), sylvian fissure(6, 24%) and frontal-temporal lobe(1, 4%). Among 15 patients who had ICH in temporal lobe, only 4 patients(26.6%) showed favorable outcome and all 3 patients who had ICH in frontal lobe showed favorable outcome. Conclusion : ICH was presented in 23.6% of ruptured MCA aneurysm patients and the prognosis of patients with ICH was worse than patients with SAH only. The ICH was located mainly in the temporal lobe and sylvian fissure.
A note on q-feebly continuous functions
Lee, Hyung-Jae,Park, Yong-Kil,Choi, Taig-Young 동국대학교 경주대학 1983 論文集 Vol.2 No.-
1961년 Z. Frolik는 feebly continuous함수를 정의하고 1973년 S.P. Arya와 Mamata Deb.는 feebly continuous 함수에 대한 몇 가지 성질(restriction, composition)을 조사하였다. 본 논문에서는 feebly continuous 함수보다 좀더 약화된 q-feebly continuous 함수를 정의하고 q-feebly continuous 함수에 대한 restriction, composition등 몇가지 성질을 조사함으로서 연속함수와의 관계를 더 잘 알 수 있게 했다.