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Styrene과 2-Hydroxypropylacrylate(2-HPA) 공중합 특성
박근호,정영언,김남석,설수덕,서영옥 東亞大學校 大學院 1999 大學院論文集 Vol.24 No.-
Solution copolymerization of Styrene(St.) with 2-Hydroxypropylacrylate(2-HPA) was carried out with Benzoylperoxide(BPO) as an initiator in toluene at 80℃ in a batch reactor. Reaction volume and reaction time were 0.3 liters, 7hours respectively. The time to reach steady state was about the six time. The monomer reactivity ratios, r1(St.) and r2(2HPS) were determined by both the Kelen-Tudos method and the Fineman-Ross method : r1(St.)=0.376(0.330), r2(2-HPA)=0.408(0.778). The activation energy of thermal decomposition was in range of 33∼55 kcal/mol.
김성배,정덕영,박종환,김성홍,여수동 慶北大擧校 師範大學 科學敎育硏究所 2000 科學敎育硏究誌 Vol.24 No.-
The necessity of the internet-aided instruction, and the advantages and restrictions of it were widely investigated as theoretical background, and the general principle of designing the instruction, model of procedure in science class, practical design of the internet-aided instruction procedure of it's development and effective approach of web design. On the basis of the above, experiment contents of 10 units in highschool common science (department of chemistry)were reconstructed, and deployment plan for teaching-learning guidance papers for experiments, reports of experiments, individualized problem for evaluation, self-learning references, guidance papers for teaching, figure files for forming concepts and principles were made. Experimental unit of chemical reaction speed which is difficult for the first grade highschool students is established, and it is made a form of CD-ROM title with animation and presentation techniques. As a result, Learning environment which raised learner's motivation was presented. Further more, based on web instruction model and instruction design principle for learning with internet, teaching-learning home page with HTML was made.
Impact of White Matter Changes on Activities of Daily Living in Mild to Moderate Dementia
Moon, So Young,Na, Duk L.,Seo, Sang Won,Lee, Jun-Young,Ku, Bon D.,Kim, Seong Yoon,Park, Kyung Won,Shim, Yong S.,Youn, Young Chul,Chung, Chan-Seung,Cheong, Hae-Kwan,Choi, Seong Hye,Cha, Kyung Ryeol,Kim S. Karger AG 2011 European neurology Vol.65 No.4
<P>The association between white matter changes and activities of daily living (ADL) in a large, well-defined cohort of patients with mild-to-moderate dementia (either Alzheimer’s disease or subcortical vascular dementia) were investigated. A total of 289 patients were divided into three groups (140 mild, 99 moderate, and 50 severe) depending on the degree of white matter changes as indicated on brain magnetic resonance image scans. Further, we analyzed the three groups’ performances on basic and instrumental ADL. The degree of white matter changes was associated with greater age, hypertension, previous history of stroke, higher Hachinski Ischemic Score, worse global cognitive and functional status, and an increased impairment of basic ADL and instrumental ADL. The increased impairment with regard to the severe group’s performance on both the basic and instrumental ADL remained significant after adjustment for age and hypertension. Tasks involving physical activities were most significant. This was the first study investigating the association between white matter changes and ADL in a large, well-defined dementia cohort. The present study suggests that severe white matter changes may be associated with higher impairment on both basic and instrumental ADL.</P><P>Copyright © 2010 S. Karger AG, Basel</P>
Park, Hee Kyung,Na, Duk L.,Han, Seol-Heui,Kim, Ji-Young,Cheong, Hae-Kwan,Kim, Seong Yoon,Kim, Sang Yun,Hong, Chang Hyung,Kim, Do-Kwan,Ku, Bon D.,Moon, So Young,Lee, Jun-Young,Shim, Yong S.,Youn, Young The Korean Academy of Medical Sciences 2011 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.26 No.9
<P>With rapid population aging, the socioeconomic burden caused by dementia care is snowballing. Although a few community-based studies of Alzheimer's disease (AD) have been performed in Korea, there has never been a nationwide hospital-based study thereof. We aimed to identify the demographics and clinical characteristics of mild-to-moderate AD patients from the Clinical Research Center for Dementia of Korea (CREDOS) registry. A total of 1,786 patients were consecutively included from September 2005 to June 2010. Each patient underwent comprehensive neurological examination, interview for caregivers, laboratory investigations, neuropsychological tests, and brain MRI. The mean age was 74.0 yr and the female percentage 67.0%. The mean period of education was 7.1 yr and the frequency of early-onset AD (< 65 yr old) was 18.8%. Among the vascular risk factors, hypertension (48.9%) and diabetes mellitus (22.3%) were the most frequent. The mean score of the Korean version of Mini-Mental State Examination (K-MMSE) was 19.2 and the mean sum of box scores of Clinical Dementia Rating (CDR-SB) 5.1. Based on the well-structured, nationwide, and hospital-based registry, this study provides the unique clinical characteristics of AD and emphasizes the importance of vascular factors in AD in Korea.</P>
A New High-Quality and High-Yielding Vegetable Peanut Cultivar, "Baekan"
Suk Bok Pae,Young Keun Cheong,Yu Young Lee,Kang Bo Shim,Chan Sik Jung,Myung Hee Lee,Chung Dong Hwang,Young Sup Ahn,Duk Yong Suh,Ho Young Kim,Chang Hwan Park,Bum Yeol Ryu,Wook Han Ki 한국육종학회 2006 한국육종학회지 Vol.38 No.4
A new vegetable peanut cultivar "Baekan" (Arachis hypogaea ssp.fastigiata. L.) was developed at the Yeongnam Agri-flowering and long ellipse-shaped large kemel. Each pod with very shallow constriction had two grains with brown testa and 100 seed weight wa
A New Short Stem Peanut Cultivar, "Sangpyeong" with Lodging Resistant and High-Yielding
Suk Bok Pae,Young Keun Cheong,Kang Bo Shim,Yu Young Lee,Chan Sik Jung,Myung Hee Lee,Chung Dong Hwang,Young Sup Ahn,Duk Yong Suh,Chang Hwan Park,Ho Young Kim,Bum Yeol Ryu,Wook Han Ki 한국육종학회 2006 한국육종학회지 Vol.38 No.4
and the very short stem cultivar "Satonoca". "Sangpyeong" with Virginia plant type has more branch number with early floweringand ellipse-shaped large kernel, compared with the check cultivar. Each pod has two grains with brown testa and 100 seed weightwa
Structure of the organic-inorganic hybrid (C6H5C2H4NH3)2ZnBr4
Young-Duk Huh,Ji Hyun Kim,Seok Soon Kweon,Won-Kwen Kuk,Cheong-Soo Hwang,June-Won Hyun,Yeong-Joon Kim,Younbong Park 한국물리학회 2006 Current Applied Physics Vol.6 No.2
The single crystal structure of the organicinorganic hybrid (C6H5C2H4NH 3)2ZnBr4 has been investigated. The crystal of(C6H5C2H4NH 3)2ZnBr4 belongs to the monoclinicP21/c space group, witha = 7.6700(12) A˚,b = 25.532(3) A˚,c= 11.1481(12) A˚,and b = 91.403(11).. The (C6H5C2H4NH 3)2ZnBr4 4 separated by bilayersof phenethyl ammonium cations.
웨이브글라이더를 이용한 천해저 탄성파 굴절법 탐사 사례
김영준 ( Young-jun Kim ),정순홍 ( Snons Cheong ),구남형 ( Nam-hyung Koo ),천종화 ( Jong-hwa Chun ),김정기 ( Jeong-ki Kim ),황규덕 ( Kyu-duk Hwang ),이호영 ( Ho-young Lee ),허신 ( Sin Heo ),문기돈 ( Ki-don Moon ),정철훈 ( Cheol-hu 한국지구물리·물리탐사학회 2017 지구물리와 물리탐사 Vol.20 No.1
전세계적으로 장기 해양 관측에 많이 활용되고 있는 웨이브글라이더를 이용하여 천해저 굴절법 탐사의 적용가능성을 시험하였다. 굴절파 기록을 위해 웨이브글라이더에 무게 추가 달린 단일채널 스트리머와 탄성파를 기록하는 상용 소프트웨어를 탑재하였다. GPS 정밀 시간동기 신호와 RF(radio frequency) 통신을 이용하여 트리거 동기화 및 실시간 자료품질 관리를 수행하였다. 웨이브글라이더가 설정 지점에 위치하게 되면, 설계된 측선을 따라 2,000 J 용량의 스파커를 2초 간격으로 발파하면서 탐사하였다. 첫 시험탐사를 통해 성공적으로 해저 천부지층 탄성파 굴절파를 취득할 수 있었다. The applicability of refraction survey has been tested using a wave glider widely used in long-term ocean observations around the world. To record seismic refractions, a single channel streamer with metal weight and a seismic recording system were mounted on the wave glider. We used GPS precise time synchronization signal and radio frequency (RF) communication to synchronize shot and recorder triggers and to control acquired data quality in real time. When the wave glider is positioned close to the set point, a 2,000 J sparker is exploded along the designed track at 2 second intervals. Through the test survey, we were able to successfully acquire refractions from the subsurface.