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RISS 인기검색어
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- 저자 : 고원석 (검색결과 22 건)
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고원석 전북대학교 환경대학원 2009 국내석사
These day there are a lot of constructions for road and highway in South Korea, and it makes more slopes. These slopes which are made from road construction should be consider aboutits environmental impacts as vegetation variation, sediment discharge and landscape view. However, tree-planting is uniformed in method of construction and applied every slopes in South Korea without any concern about the environment and landscape, so it affects environment and landscape. Therefore, it is needed to draw up the plan which is eco-friendly and ecological. Generally, tree-planting for road slopes should be based on restoration of an ecosystem, wildlife habitat, and preservation of landscape in vegetation and methods of construction. However, the trends of South Korea's tree-planting is not enough to adapt to various construction sites, so it is happened that the tree-planting is failed or devastated. Recently, the guideline for EcoTeera method of construction which is made for restoration of environment and ecosystem, amenity and stability for human takes effect by way of showing an example. This guideline regulates three major rules. At first, adaption of method for construction should be chosen by environmental characteristics, so it can be habitats for wildlife. Second, the vegetation for tree planting should introduce the species which is naturally grow in the construction site, because the existing method of construction usually introduced western grass which is not suitable for wildlife habitats. Thirdly, the restoration goal should be clearly planned so that the suitable method of construction can be chosen. Thus, this study experimentally adapt the Ecoteera method with other exsting methods to the research site to compare the effectiveness. With the result of adaptation, this study purposes to find suitable method of construction and to monitor the vegetation of each method to improve the the quality of tree-planting.
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이층 구조체를 갖는 실내 중계기용 십자형 모노폴 안테나에 관한 연구
본 논문에서는 실내 및 음영지역 개선을 위한 실내중계기용 다중대역 안테나를 제안하였으며 제안한 내용을 검증하기 위해 설계, 구현, 측정의 과정을 거쳐 내용을 확인하였다. 현재 실내 중계기용 안테나는 전방향성, 준수한 이득, 천장에 설치되는 특징으로 λ/4 모노폴 안테나가 많이 사용이 되고 있다. 그러나 모노폴 안테나의 특성상 대역폭이 좁기 때문에 이를 극복하고자 연구를 통해 평면형 모노폴 안테나를 십자형 모양으로 바꾸어 사용하고 있는 상황이다. 현재 실내중계기 안테나의 대역폭은 대부분 Wi-Fi가 포함되어있는 1.7 GHz~2.4GHz 대역이다. 사용자가 급속하게 늘어남에 따라 Wi-Fi 주파수대역이 포화상태가 되고, 그로인해 데이터 전송에 차질이 생기자 주파수대역 확장이 요구되고 있다. 하나의 십자형 모노폴 안테나로는 확장 가능성이 높은 대역폭인 5G Wi-Fi인 5GHz~5.25GHz 대역과 3.4GHz~3.6 GHz 대역을 전부 커버하기에는 무리가 있다. 이를 해결하기 위해 각각의 대역마다 새로운 실내중계기 안테나를 설치해야하는 것은 많은 비용과 시간이 든다. 본 논문에서 제안한 안테나는 십자형 모노폴 안테나위에 이층 구조체를 추가하여 다중대역 특성을 갖게 하여 이를 해결하고자 했다. 제안한 안테나는 기존 대역폭을 포함한 PCS, WCDMA, WIBRO, Wi-Fi, 위성 DMB 대역(1.75GHz~2.655GHz) 대역에 3.4GHz~3.6GHz 5GHz~5.25GHz 의 추가된 대역까지 전부 확보하였다. 대칭성 구조로 인해 전방향성의 특징을 가지게 되었다. 기존의 십자형 모노폴 안테나의 구조를 크게 바꾸지 않고 구조체를 추가하는 형태로 제작비용이 크지 않고 구조가 간단하여 대량생산이 가능하다. 대역폭 확장으로 인해 기존 실내중계기 안테나들을 교체하거나 확장된 대역별로 안테나 추가가 불가피한 상황에서 제안한 설계방식을 대안으로 이용한다면 하나의 다중대역 안테나만으로 해결할 수 있다. 중계기 외에 공유기, 무전기 등 모노폴 안테나 사용되는 기기에도 적용가능성이 크다고 판단된다.
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L4기반 가상화 기술을 적용한 임베디드 시스템의 성능평가
CE(Consumer Electonics)와 같은 임베디드 시스템이 발전함에 따라 사용자의 요구 또한 증대되었다. 하드웨어의 발달로 기능이 다양해지고 소프트웨어 스택의 복잡성도 증가하여 시스템의 신뢰성은 보장하기 어렵다. 실시간 처리를 요하는 미디어 플레이어나 보안성을 요구하는 모바일 뱅킹과 같이 서로 다른 특성을 갖는 응용프로그램들은 하나의 범용 운영체제에서 모두 처리하기 어려우며 처리하더라도 신뢰성이나 보안성이 떨어지기 마련이다. 이러한 문제점들을 해결하기 위한 여러 방법들이 대두되었으며 그 중 하나가 가상화 기술을 임베디드 시스템에 적용하는 방법이다. 전통적인 가상화는 네트워크나 스토리지 측면에서 많은 연구와 발전이 있었으며 서로 다른 여러 종류의 머신들을 하나의 머신으로 동작하는 것처럼 보이게 하는 것이 전통적인 가상화이다. 허나 임베디드 시스템에서의 가상화는 하나의 머신에서 다양한 운영체제들이 공존하게 하여 서로 다른 특성을 지는 응용프로그램들이 자신에 적합한 시스템에서 동작할 수 있게 하는 것을 말한다. 본 논문에서는 가상화 기술 중 L4기반의 가상화 기술을 임베디드 시스템에 적용하고 이에 대한 성능을 평가한다. Consumer electronics, embedded systems and the growing requirements of users will go up. Many of the features of the hardware, and software complexity, and increases the reliability of the system is difficult to guarantee. Applications that require real-time processing and security features, such as applications that require different kinds of characteristics of the application of the general-purpose operating system, a process that will lead to various problems. Reliability or security of the system vulnerable to the fall can be seen that to solve these problems, one of several ways, and the rise of virtualization technology is embedded in the system and how to apply. Traditionally, virtualization means technology that makes a computer appear to be multiple computers or a different computer entirely. It has been developed on network and storage field and there are several technologies for it. In embedded system, virtualization makes it possible to run several operating systems on a machine and different applications on each of operating systems. This paper introduces virtualization technology for embedded system based on L4 and evaluation of it.
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廣寒樓 樓亭詩 硏究 : 朝鮮 初.中期 文人들을 中心으로
Gwanghan-tower, which is located at Namwon, has become the foundation of chunhyangjeon and it is representative pavilion of Korea when we take into account its long history, beautiful scenes and its typical characteristic of garden of Chosun. Many scholars of Chosun dynasty wrote poems at this pavilion and these poems have preserved by hanging framed pictures on this pavilion wall. Poems about Gwanghan-tower pavilion were recorded in 'Yongseongji' or booklet which is collect the private writing. However, despite of the great reputation of Gwanghan-tower, its research is extremely rare so we need to carry out a profound investigation study. This study analyzed the contents and features of those poems, which are based on the poems of 29 people-the scholars in the early to medium of the chosun dynasty whose poems are recorded on the 'Yongseongji' and 'Yongseongchangsujip'. We can devide these poems into three parts by subject. First, longing for a fairly land ; 14 pieces, enjoying the scenery of pavilion and expressing the mindset ; 9 pieces, considering the grace of king ; 6 pieces. - 71 - About Gwanghan-tower, we can find three characteristics. First, Chosun people pursued the ideal world through Gwanghan-tower. they dreamed a utopia by writing a poem. Second, most of poems about pavilion are based on the early to medium of Chosun, so specific poetical arena had not been formed and poems also have features of travel poetry. Finally, most form of poems about Gwanghan-tower is comprised of 'Chileonyulsi', a style of chinese verse which has seven characters to the line. In addition, a lot of poems have rhyme ‘Woo’. Especially in case of poems in the period dominated by Japan, the rhyme ‘Woo’ is appeared mainly because the scholars decided the rhyme in advance of their writing. Although love of Chunhyang is the representative subject of Gwanghan-tower, this study has a limit that it cannot approach the poems in late Chosun or the period dominated by Japan. Therefore, we need to find the poems in late Chosun remained in the private writing and conduct further research about the poems of period dominated by Japan.
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非壓密非排水(UU) 三軸壓縮 試驗에 依한 補强花崗風化土의 動的强度特性
高圓錫 全北大學校 産業技術大學院 2004 국내석사
Supplementary earth studied by Henry Vidal since 1960’s is a complex of earth and supplementary materials with high tensile inserted into earth with a fixed interval. In the theoretical background, as the shearing strength of earth increases due to the friction between earth and supplementary materials and in particular the tensile strain of the earth structure with weak tensile strength is enforced by the supplementary materials, more effective structure can be built. Over the past few decades, the usage of geosynthetics in geotechnical engineering has been increased greatly. Their mechanical properties allow for increasing the bearing capacity of foundation and the stability of embankment, retaining wall and many other soil structures. Recently they have been applied in ‘Reinforced Earth’ which is now widely used as a general description. Reinforced earth method has been developed by Henri Vidal in 1966. When enforced earth is used for the retain wall and four walls, the most important thing would be how to maximize the land utilization. In enforced earth structures, hardening will decide that of the structure. Accordingly, in case of enforced earth, we pile up the minimal height of earth (20~30cm) and harden the earth using a static?dynamic hardening machine. In this study, we tried to analyze and compare the stress?transformation characteristics of reinforcement weather soil with geosynthetics when repetitive load is added to the enforced earth structure and when static load is added. The purposes of the study are as follows; 1) To compare and analyze non?rectified weathered granite soil and rectified weathered granite soil by executing a unconsolidated-undrained triaxial compression tests. 2) To identify the transformation and strength characteristics of weathered granite soil reinforced with geotextile due to the repetitive dynamic loads through comparison of the stress?transformation changes due to the static load and the repetitive dynamic loads.
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고원석 東亞大學校 敎育大學院 1976 국내석사
This study was carried out to investigate the variation of fiber length and the width of some Edgewarthia papyrifera, and the correlation between the length and the width of them in each individual part and so every trunk was selected as the experimental materials for I year old to 3 years old of the paper Edgewarthia papyrifera growing at Chung-mu, Nam-hee and Chang-won, in Gyoun-nam, and Go-hung in Jeon-nam province, Korea. The fiber tissues was gathered in each individual part about the height of this tree, dividing the three parts (the upper part, the middle part, and the lower part.), the inside fiber and the outside fiber tissues. The results are summarized as follows; 1. The length and the width of fiber tissue increase to old twigs. 2. The fiber length is longer and longer, going up from the lower part to the upper part of this tree. 3. The fiber width is longer and longer, going down from the upper part to the lower part of this tree. 4. The inside fiber tissue is longer than the outside fiber tissue, and the inside fiber tissue is comparatively variable but the outside fiber tissue is not.
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