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Choi, Dukhyun,Choi, Min-Yeol,Choi, Won Mook,Shin, Hyeon-Jin,Park, Hyun-Kyu,Seo, Ju-Seok,Park, Jongbong,Yoon, Seon-Mi,Chae, Seung Jin,Lee, Young Hee,Kim, Sang-Woo,Choi, Jae-Young,Lee, Sang Yoon,Kim, Jo WILEY-VCH Verlag 2010 ADVANCED MATERIALS Vol.22 No.19
<B>Graphic Abstract</B> <P>The cover shows an image of fully rollable transparent nanogenerators synthesized using chemical vapor deposition grown large-scale graphene sheets as transparent electrodes and piezoelectric ZnO nanorod arrays. Sang-Woo Kim, Jae-Young Choi, and co-workers report on p. 2187 the electrical and structural stability of the nanogenerators, with excellent charge scavenging performance under external mechanical loads such as bending and rolling. This study shows that graphene-based nanogenerators are very promising for self-powered rollable transparent device applications. <img src='wiley_img_2010/09359648-2010-22-19-ADMA201090066-content.gif' alt='wiley_img_2010/09359648-2010-22-19-ADMA201090066-content'> </P>
Simplified Effective Compressive Strengths of Columns with Intervening Floor Slabs
Seung?Ho Choi,Jin?Ha Hwang,Sun?Jin Han,Hae?Chang Cho,Jae Hyun Kim,Kang Su Kim 한국콘크리트학회 2020 International Journal of Concrete Structures and M Vol.14 No.5
The current design codes discuss the effective compressive strengths of columns, which reflect a decrease in load transfer performance that can occur when columns and slabs have different concrete compressive strengths. The effective compressive strength of a column increases as it is confined by the slab, and the design codes mandate three different effective compressive strengths for interior columns (confinement on four sides), exterior columns (confinement on three sides), and corner columns (confinement on two sides). For both corner and exterior columns, the confinement effect of the slab is significantly smaller than that for the interior column, and there is a more marked decrease in load transfer performance. However, there is still a lack of theoretical studies investigating the effective compressive strengths of the corner and exterior columns. Therefore, based on the analysis model established in previous research, this study has proposed an equation for calculating the effective compressive strengths of the corner, exterior and isolated columns without any confinement effects of the slab. In addition, axial loading tests of isolated columns were conducted and the proposed equation was verified.
Young-Chul Kim,Hyun-Hee Chae,Sang-Heock Oh,Seung-Ho Choi2,Moon-Pyo Hong3,Gi-Heum Nam,Jae-Yoon Choi,Hyun-Sook Choi,Kyu-Song Lee 한국환경생태학회 2015 한국환경생태학회지 Vol.29 No.2
Yongneup wetland protected area, the only high moor in Korea, is a core area to conserve biodiversity. Even though the Yongneup wetland protected area is relatively small, various plant species are distributed in the Yongneup wetland protected area because it includes various habitats showing different environmental gradients. Vascular plants distributed in the Yongneup wetland protected area were identified as a total of 376 taxa that is composed of 73 families, 217 genera, 322 species, 3 subspecies, 44 varieties and 7 forms. For endangered plants designated by the Ministry of Environment, 5 species including Trientalis europaea var. arctica, Lilium dauricum, Halenia corniculata, Lychnis wilfordii and Menyanthes trifoliata were found and 34 taxa were confirmed to be distributed only in the mountainous wetland habitats. Regarding naturalized plants, a total of 11 taxa were distributed, but most of them were distributed in the areas where artificial interference has occurred. And in areas inside the wetlands that are relatively well preserved, 2 species of Bidens frondosa and Erigeron annuus were observed. In this study, the occurrence and distribution of Pseudostellaria baekdusanensis M. Kim, which was recently found in Mt. Baekdu and reported as a new species, were identified in the Yongneup wetland protected area. A wetland is a very vulnerable area to drastic environmental changes and damages to its ecosystem could cause the extinction of rare plant species which are distributed only in the wetlands. Therefore, it is mandatory that current status of the Yongneup wetland protected area is evaluated and actions to prevent rapid environmental changes are taken. Fourteen separate investigations were conducted in 2013 and another four in 2014, to evaluate current status of the Yongneup wetland protected area. These investigations have provided us the basic information for future actions of conservation and restoration.
납골시설의 공간구성에 관한 건축계획적 연구 : 서울, 경기도의 납골당을 중심으로
최진원,박재승 한국의료복지시설학회 2004 의료·복지 건축 Vol.10 No.2
The purpose of this study is to the spatial composition of charnel facilities. The study method is as follow: First, To Examine existent research material about charnel house. Second, To Investigate controversial point of equipment and development direction through research the case of cremated human remains deposit rooms in 12 charnel houses constructed since 1990. So, to propose the planning direction of spatial composition based on the analysis results and utilize to basis data that is necessary in research of same kind hereafter.
골다공증에 의한 압박 골절의 치료에 있어서 경피적 추세 성형술의 의의
최재영,윤승환,조준,문창택,장상근 건국대학교 의과학연구소 2001 건국의과학학술지 Vol.11 No.-
Percutaneous vertebroplasty has recently been introduced as a therapeutic alternative for the treatment of pain associated with osteoporotic compression fractures and performed popularly at a few centers by neurosurgeons. This technique allows marked pain relief through stabilization of microfractures and strengthening of weakened vertebral body. Authors retrospectively analyzed the clinical outcome of 100 patients with osteoporotic compression fractures for investigating the therapeutic effectiveness of percutaneous vertebroplasty. They were treated with vertebroplasty from April to August 1999. Plain X-ray of all patients showed osteoporotic compression fractures at more than one level.
테니스 포핸드 스트로크 시 오픈스탠스의 족저압력분포의 변화
최지영,김승재,이의린 한국운동역학회 2005 한국운동역학회지 Vol.15 No.1
J. Y. CHOI, S. J. KIM, E. L. LEE. Change of Plantar Pressure Distribution of Open Stance during Forehand Stroke M Tennis. Korean Journal of Sport Biomechanics, Vol. 15, No. 1, pp. 143-153, 2005. Recently among several tennis techniques forehand stroke has been greatly changed in the aspect of spin, grip and stance. The most fundamental factor among the three factors is the stance which consists of open, square and close stance and it is very important to know the patterns of plantar pressure distribution for the better understanding of forehand stroke. Therefore, the purpose of this study was to investigate the change of plantar pressure distribution in open stance during forehand stroke in tennis. Three high school tennis players were recruited for the study and required to perform forehand stroke five consecutive trials in the condition of open stance. The forehand strokes were filmed with two digital video cameras and measured with pedar system for plantar pressure. The plantar regions under the foot were divided into 3 regions, which were forefoot, midfoot, and rear foot. In conclusion, The plantar pressure of open stance during forehand stroke was distributed more largely to the right foot. The plantar pressure of open stance during forehand stroke was distributed more weight loads on forefoot of right than heel of right
최지영,김로빈,김승재 한국운동역학회 2000 한국운동역학회지 Vol.10 No.1
The Purposes of this Study was to investigate the relations between the movement of rearfoot and vertical impact force in running by analyzing kinematic and kinetic variables. The subjects of this study were 6 students who did not experience any pain or injury in their lower leg and had normal feet conditions. The subjects performed heel-toe running on 7m long runway at the speed of 4㎧ in two conditions that they wore with weight and without weight. The data were collected by using cinematographic method to analyze kinematic variables and by force platform to analyze kinetic variables. The cinematography data were collected by high speed camera(Photosonic) at the speed of 100f/s and reaction force data were collected by force plate(Bertec) with collecting frequency of 500㎐. As a result of this study The kinematic variables did not show any significant differences, but the kinetic variables shown significant differences with weight. Additional weight was mort increasing total contact time in support phase and vertical force than movement of rearfoot.