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.

이동 애드 혹 네트워크에서의 환경적응형 QoS AODV 라우팅 프로토콜에 관한 연구

裵振勝,宋東勳,吳世德,鄭燦赫,金玄郁,李光培,文泰洙,郭承郁,河載承 明知大學校 産業技術硏究所 2004 産業技術硏究所論文集 Vol.23 No.-

In this paper, we propose a bidirectional mobile Ad Hoc routing protocol based on AODV(ad-hoc on-demand distance vector routing) with QoS(quality of service) support. At presence, wireless mobile communication focuses on how to efficiently support mobility of users more than QoS guarantee. However, in order to satisfy requirement of various applications which have been or will be served, QoS guarantee between end points is a very important issue. The existing AODV routing protocol is implemented to use only BE (Best Effort) service. However, actual wireless mobile environment requires to reduce a waste of communication resources and meet with the real-time change of data paths by setting up routes with QoS support, considering available communication resources at each node in advance. Therefore, in this thesis, we propose an adaptive QoS support method using hello message in order to rapidly meet with the change of available communication resources and to smoothly perform route maintenance. For performance evaluation, we analyzed the average data reception rate. At that time, we used evaluation parameters such as node's mobility-stop time, hello message period, and packet priority, considering the node's mobility and the number of best effort/QoS data flows. As results, we found that with our proposed method the average data reception rate was increased 16.293%, 15.914%, 17.238% for 300 mobility-stop second case and 4.809%, 4.264%, 2.956% for 300 mobility-stop second case.

어린이 그림책의 교육인간학적 의의

백승화 ( Seung Hwa Baek ),강기수 ( Gi Su Kang ) 한국어린이문학교육학회 2012 어린이문학교육연구 Vol.13 No.3

그림책은 언어와 그림이라는 두 가지 서로 다른 매체가 결합하여 의미를 전달하는 독특한 의사소통의 수단이자 글과 그림이 어우러진 새로운 예술형식이다. 또한 그림책은 어린이가 접하는 최초의 책으로 오늘날 많은 어린이에게 보편화된 교육매체이다. 따라서 본 논문은 어린이와 그림책을 교육 인간학적 관점에서 체계적으로 이해하고, 그림책을 통해 어린이 존재의 사고 특징을 고찰하고자 하였으며, 이에 근거하여 어린이 그림책의 교육인간학적 의의를 탐색하고자 하였다. 그림책에 반영된 어린이 사고의 특징을 살펴보면, 어린이는 물활론적 사고, 환상적 사고, 모험적 사고를 하는 존재로서, 어린이의 다양한 사고는 유기적 결합에 의해 상호연관을 가지며 발달해감을 알 수 있었다. 이러한 논의를 바탕으로 어린이 그림책의 교육인간학적 의의를 제시하면, 우선 어린이 그림책은 어린이에 대한 깊은 이해가 가능하게 하였으며, 어린이에게 풍부한 경험을 제공한다. 또한 어린이 그림책은 어린이의 관계형성에 기여하며, 어린이의 주체적인 자아형성의 토대를 마련해 준다. Picture books are a unique communicative tool and a new kind of art in which letters and pictures are combined. Picture books are also a popularized educational medium in teaching children how to read. Therefore, the picture book is, for children, a literary, artistic, and educational resource. This study explores the strategies of how picture books can be used for children`s education by understanding the essential characters of picture books and the relationship between children and picture books. The study finds that children engage in animistic, fantastic and adventurous thinking. Through analyzing the characteristics of children`s thinking reflected in children`s books, the study finds these three characteristics are interwoven and children`s thinking develops in this interwoven relationship. The educational-anthropological significance of children`s picture books is as follows: Firstly, picture books enable educators to understand children and to show a concrete direction of children`s education. Secondly, picture books provide an aesthetic experience to make children aware of beauty. They also serve as a foundation for children`s relationships and shape each child`s independent self. The author suggests this is the educational task of the picture books. In order to promote the authentic education of children through picture books, it is crucial to recognize the educational importance of the picture book. It is also necessary to foster an environment that is conducive for children to read picture books and to encourage self-motivated reading. It is necessary to study various aspects of children`s picture books in order to produce good quality picture books.

Lithographically-featured photonic microparticles of colloidal assemblies

Lee, Su Yeon,Kim, Shin-Hyun,Heo, Chul-Joon,Hwang, Hyerim,Yang, Seung-Man Royal Society of Chemistry 2010 Physical Chemistry Chemical Physics Vol.12 No.38

<P>We have described a new and promising strategy for the fabrication of composite and porous photonic crystal microparticles that combines the self-assembly of colloidal particles with photolithography techniques. We fabricated silica/SU-8 composite microparticles with photonic bandgaps <I>via</I> four steps: (1) deposition of the silica colloidal crystals on the photoresist, (2) embedding of the colloidal crystals in the photoresist, (3) UV exposure through a photomask and subsequent development, and (4) release of the microparticles from the substrate. Embedding was performed above the glass transition temperature (<I>T</I><SUB>g</SUB>) of uncrosslinked SU-8. At such temperatures, capillary forces on the silica particles facilitate the migration of colloidal crystals in the SU-8 matrix. Particle migration ceased when the top colloidal crystal layer was trapped at the interface between air and SU-8. In addition, we also prepared porous microparticles with an inverse opaline structure by dissolving the embedded silica particles from the composite structures. The porous microparticles showed enhanced reflectivity at the bandgap position due to the large refractive index contrast. The bandgap position of the microparticles was controlled by the size of the silica particles, which determined the lattice constant. Bilayered composite and porous microparticles with two distinct photonic bandgaps were also prepared by sequential deposition of colloidal crystals composed of two differently sized silica particles.</P> <P>Graphic Abstract</P><P>A new and promising fabrication strategy of photonic crystal microparticles was demonstrated by combining colloidal self-assembly with photolithography. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0cp00134a'> </P>

무선 애드 혹 기반 액티브네트워크상에서 QoS지원에 관한 연구

李基源,裵振勝,丁燦赫,金玄郁,李光培,姜景仁,朴京培,文泰洙,郭承郁,河載承 明知大學校 産業技術硏究所 2003 産業技術硏究所論文集 Vol.22 No.-

Abstract - In this thesis, we propose a QoS supporting method on wireless ad hoc-based active network for improving reliability. On the loss of route path, the existing DSR routing protocol has several problems with wireless network communication because of decease of data reception rate and increase of network load. The proposed method improves reliability of data transfer by using functions of active network. That is, by using functions of active nodes and active packets, the proposed method supports QoS with reservation transfer method that saves data packets on transfer at intermediate nodes with lost path and then re-transmit the packets after route reconfiguration.

요골동맥을 통한 관상동맥촬영 중 진단된 편위된 우측쇄골하동맥 1예

한승희,김수영,박혜경,박종성 영남대학교 의과대학 2012 Yeungnam University Journal of Medicine Vol.29 No.1

The left aortic arch with an aberrant right subclavian artery, or arteria lusoria, is the most common aortic arch anomaly, occurring in 0.5-2.5% of individuals. In such cases, the angular course of the arteria lusoria to the ascending aorta imposes difficulty in passing a guide wire to the ascending aorta during right transradial catheterization. Here, the case of a 53-year-old woman with intermittent chest tightness and coughing is reported. Aberrant right subclavian artery(arteria lusoria) was diagnosed via aortogram during right trans- radial coronary angiography. Compression of the esophagus and trachea by the aberrant right subclavian artery was demonstrated by chest computed tomography(CT).

고 Mn-Cr 강의 조사손상에 미치는 전자선 조사 온도의 영향

배동수,정호신,강창용,남승훈,이해무 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.3

The effect of electron-beam irradiation temperature on irradiation damage of 12%Cr-15%Mn austenitic steel for structural material of nuclear and/or fusion reactors from the point of view of the reduced activation was investigated by using the 1,250 keV HVEM and an energy dispersed X-ray analyzer(EDX) in a 200 keV FE-TEM with beam diameter of about 0.5 nm. Void formation was not observed in irradiated specimen. The dislocation loop growth was observed and the density and size of dislocation loop were increased with irradiation dose. Irradiation-induced segregations of Cr and Mn at grain boundary were also observed by electron-beam irradiation condition. The amount of Mn segregation was increased with irradiation temperature, however, segregation phenomenon was disappeared in the case of Cr.

장기간 항갑상선제 투여 후 임의 중단 뒤 재복용시 발생한 무과립구증 1 예

김승만;김태영;박수영;배영환;서영경 정은주;김태균;권민정;박정현;이순희 인제대학교 2011 仁濟醫學 Vol.32 No.-

Agranulocytosis, one of the major side effects of antithyroid a gents, probably occurs in less than 0.25% of cases treated with antithyroid agents. It usually occurs within the first several weeks or months after the initiation of therapy, when drug dosage is higher. Most reported cases of agranulocytosis have occurred during the first 3 months of therapy. We describe here a rare case that did not experience the side effect for 6 years of antithyroid agent treatment but presented with agranulocytosis in one month after re-exposure. It suggests that the major side effect such as agranulocytosis can occur in patients who had undergone prior uneventful antithyroid drug therapy.

혼파초지에서 질소시비수준과 방목율이 목초 및 육우생산에 미치는 영향

현봉수,김문철,김영호,송성언,이승협 제주대학교 농과대학 제주도축산문제연구소 1986 畜産論叢 Vol.1 No.1

Effects of N fertilizer levels and stocking rates on beef production in a mixed pastiire of orchard-grass, perennial ryegrass, tall fescue, red clover and alsike clover were studied using 3 levels of N fertilizer (50, 100 and 200 kg/ha) and 3 stocking rates (3,4 and 5 head /ha). The summarized results are the following; 1. Increasing nitrogen fertilizer on the mixed pasture increased dry matter yield and protein content(P<0.05) of the pasture species. The stocking rate did not influence either dry matter yield or protein content. 2. The percentage of pasture species increased and that of weeds decreased with increasing N fer-tilizer levels. lncreasing stocking rate from 3 to 5 heads/ha significantly influenced that of the other pastures and weeds. 3. Herhage intake per animal increased at the lower stocking rate, but total herbage intake per ha increased at the higher stocking rate, Increasing nitrogen fertilizer decreased herbage intake per animal , but slightly higher intake per animal was obserbed at 5 head stocking rate. 4. No significant difference in weight gain/ha was found among N levels and stocking rates ussd. Live weight gain per animal was greater at the higher N level and also at the louer stocking rate.

차류에 의한 찻물중 중금속(Cd, Pb)제거 효과

백승화,박성수,김중만 圓光大學校 1996 論文集 Vol.31 No.2

차재료를 찻물에 담근후 차건데기를 건저내고 마시는 차류의 중금속 제거능을 조사하기 위하여 Cd, Pb 용액에서 보리차, 옥수수차, 쟈스민차, 현미녹차, 홍차, 결명자차, 감껍질차, 귤껍질차, 누룽지의 입자별, 농도별, 온도별 제거정도를 조사한 결과는 다음과 같다. 입자의 크기가 작아질수록 모든 차에 있어서 중금속 제거력은 증가 되었고, 금속별 제거량은 Cd는 결명자차(3.253-6.136mg/g)가, Pb는 쟈스민차(6.784-7.557mg/g)가 높았다. 농도별 중금속 제거량은 중금속의 농도가 증가할 수록 증가하였는데 Cd와 Pb는 쟈스민차(1.209-4.815mg/g)가 제거력이 높았다. 농도별 중금속의 제거작용은 모든 차류에서 증가되었으나 옥수수차는 Pb에서 0.497-0.647mg/g로 제일 낮았다. 온도별 중금속 제거량은 온도가 높아질수록 증가하여 Cd은 결명자차가 4.080-7.799mg/g, Pb는 쟈스민차가 7.003-7.763mg/g으로 증가하는 경향을 보였다. 이상의 결과로 부터 맹물로 끓여마시는 것보다는 각종 차를 이용하여 찻물을 만들어 마시면 음용수에 함유된 중금속을 제거하는데 도움이 된다. To investigate heavy metals(Cd and Pb) removablity by the tea materials (barley-tea, corn-tea, jasmin-tea, brown rice-green tea, black-tea, cassia tora-tea, persimmon peel-tea, orange peel-tea and rice-tea) in the tea-water, heavy metal removability of nine kinds of tea was investigated in the various conditions; particle size of tea(20, 40, 70 mesh), concentration of heavy metal(25, 50, 100 ppm) and extraction temperature(20, 30, 50, 100℃). The removabilities by the tea solids were increased as the particle size decreased, concentration of heavy metal increased, and extracting temperature increased. Of the nine kinds of tea, Cd and Pb removability by jasmin-tea was highest. In addition, heavy metal removability by cassia tora tea was better than that of other tea as extraction temperature was increased.