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극저온용 공기 흡입장치의 Louver 형상에 의한 유동해석
고지원(Ko jee-Won),박재현(Park Jea-Hyoun),김정환(Kim Jeong-Hwan),문경은(Mun Gyeong-Eun),김태형(Kim Jeong-Sik) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.4
This study is analysis to the Lover of Cryogenic Air Inhalation. The result according to the temperature difference at the inlet side and outlet side, we confirm to it is suitable for the Cryogenic environment.
Bhak, Ghibom,Lee, Junghee,Kim, Chang-Hyun,Chung, Dong Young,Kang, Jin Hyoun,Oh, Soojung,Lee, Jungsup,Kang, Jin Soo,Yoo, Ji Mun,Yang, Jee Eun,Rhoo, Kun Yil,Park, Sunghak,Lee, Somin,Nam, Ki Tae,Jeon, No American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.10
<P>Functional graffiti of nanoparticles onto target surface is an important issue in the development of nanodevices. A general strategy has been introduced here to decorate chemically diverse substrates with gold nanoparticles (AuNPs) in the form of a close-packed single layer by using an omni-adhesive protein of a-synuclein (alpha S) as conjugated with the particles. Since the adsorption was highly sensitive to pH, the amino acid sequence of aS exposed from the conjugates and its conformationally disordered state capable of exhibiting structural plasticity are considered to be responsible for the single-layer coating over diverse surfaces. Merited by the simple solution-based adsorption procedure, the particles have been imprinted to various geometric shapes in 2-D and physically inaccessible surfaces of 3-D objects. The alpha S-encapsulated AuNPs to form a high-density single-layer coat has been employed in the development of nonvolatile memory, fule-cell, solar-cell, and cell-culture platform, where the outlying aS has played versatile roles such as a dielectric layer for charge retention, a sacrificial layer to expose AuNPs for chemical catalysis, a reaction center for silicification, and biointerface for cell attachment, respectively. Multiple utilizations of the alpha S-based hybrid NPs, therefore, could offer great versatility to fabricate a variety of NP-integrated advanced materials which would serve as an indispensable component for widespread applications of high-performance nanodevices.</P>
대립계 포도 천창개폐형 비가림하우스의 최적 파이프 규격
염성현(Sung Hyun Yum),윤남구(Nam Gyu Yun),김경원(Gyeong Won Kim),이성현(Sung Hyoun Lee),조용호(Yong Ho Cho),박서준(Seo Jun Park),박문균(Mun Kyun Park) (사)한국생물환경조절학회 2007 생물환경조절학회지 Vol.16 No.4
본 연구는 기존 비닐하우스 아연도 강관을 사용한 하우스 폭 3.6m와 5m 천창개폐형 대립계 포도 비가림하우스에 대한 구조적 안전성을 검토하고, 인장강도 400Nㆍ㎜?²(SGH400 등) 이상의 파이프를 사용하는 조건에서 하우스 폭 5m인 천창개폐형 대립계 포도 비가림하우스에 대하여 구조적으로 안전한 최적 파이프 규격을 제시하고자 수행하였다. 주기둥 3m×서까래 60 ㎝인 천창개폐형 3.6m 비가림하우스의 경우, 적설심 35㎝에서는 구조적으로 안전한 것으로 분석되었으나 측면 및 전후면 풍속 35mㆍs?¹에서는 불안전한 것으로 나타났으며, 동일 주기둥과 서까래 간격을 갖는 천창개페형 5m 비가림하우스의 경우에는 적설심 35와 풍속 35mㆍs?¹에서 모두 불안전하여 구조보강이 필요한 것으로 분석되었다. 그리고 동일 주기둥과 서까래 간격을 가지나 인장강도 400Nㆍ㎜?² 이상을 갖는 파이프를 사용하는 조건에서 천창개폐형 5m 비가림하우스의 최적 파이프 규격은 지붕높이 1.6m(아치형)와 지붕높이 1.8(복숭아형)에 대하여 동일하게 두 경우로 규격화할 수 있었다. 즉, 안전풍속 35mㆍs?¹와 안전적 설심 40㎝에서 구조적으로 안전한 서까래 규격은 Ф31.8×1.5t@600이었으며, 안전풍속 30mㆍs?¹와 ss 안전적설심 35㎝에서는 서까래 Ф25.4×1.5t@600인 것으로 분석되었다. 덕면으로부터 곡부보까지의 높이는 안전적설심보다는 안전풍속에 직접적인 영향을 미치는 것으로 분석되었으며, 처마를 높임에 따라 측면풍속에 대해서는 방풍벽파이프(측벽서까래)를, 전후면 풍속에 대해서는 마구리기둥의 규격을 강화하여야 하는 것으로 분석되었다. This study was carried out to: (1) analyze structural stability of representative rainsheltering greenhouses for large-grain grapevine cultivation with widths of 3.6 and 5 m in case of using the existing pipe for agriculture; (2) present the optimum specification of pipes in the greenhouse with a width of 5 m under the condition of using the pipe of which ultimate strength has been above 400 Nㆍ㎜?²; (3) evaluate stability and also present the optimum specification of pipes as eaves height was augmented. The above analyses were done for greenhouses with roof vents and also with a main-column interval of 3 m and a rafter interval of 60㎝ First, the existing 3.6m greenhouse with a rafter of Ф25.4 × 1.5 t@600 was stable for a snow-depth of 35 ㎝ but unstable for a wind velocity of 35mㆍs?¹, Meanwhile the existing 5 m greenhouse with the same rafter was not stable for a wind velocity of 335 mㆍs?¹ as well as a snow-depth of 35㎝. This meant that existing greenhouses had to be reinforced to secure stability. Second, the specification of pipes, especially rafter, could be classified as two cases. One had a structural stability at a safe wind velocity of 35 mㆍs?¹ and a safe snow-depth of 40㎝ for which stability the rafter had to be Ф31.8 × 1.5 t@600, and the other had a stability at 30 mㆍs?¹-35㎝ at the specification of rafter Ф25.4 × 1.5 t@600. Finally, eaves height had a significant effect on safe wind velocity. But it had little influence on safe snow-depth. The results showed that the specification of side-wall pipes had to be reinforced for the safe side velocity according to the increment of eaves height and similarly the specification of fore?end post for the safe fore-end velocity.
Spin-polarized Current Switching of Co/Cu/Py Pac-man type II Spin-valve
Andrew Lyle,Yang-Ki Hong,Byoung-Chul Choi,Gavin Abo,Seok Bae,Jeevan Jalli,Jae-jin Lee,Mun-Hyoun Park,Ryan Syslo 한국자기학회 2010 Journal of Magnetics Vol.15 No.3
We investigated spin-polarized current switching of Pac-man type Ⅱ (PM-Ⅱ) nanoelements in Pac-man shaped nanoscale spin-valves (Co/Cu/Py) using micromagnetic simulations. The effects of slot angle and antiferromag-netic (AFM) layer were simulated to obtain optimum switching in less than 2 ns. At a critical slot angle of 105˚, the lowest current density for anti-parallel to parallel (AP-P) switching was observed due to no vortex or antivortex formation during the magnetic reversal process. All other slot angles for AP-P formed a vortex or antivortex during the magnetization reversal process. Additionally, a vortex or anti-vortex formed for all slot angles for parallel to anti-parallel (P-AP) switching. The addition of an AFM layer caused the current density to decrease significantly for AP-P and P-AP at slot angles less than 90˚. However, at slot angles greater than 90˚, the current density tended to decrease by less amounts or actually increased slightly as shape anisotropy became more dominant. This allowed ultra-fast switching with 5.05 and 5.65 x 10? A/㎠ current densities for AP-P and P-AP, respectively, at a slot angle of 105˚.
대립계 포도 천창개폐형 비가림하우스의 최적 파이프 규격
염성현(Sung Hyun Yum),윤남규(Nam Gyu Yun),김경원(Gyeong Won Kim),이성현(Sung Hyoun Lee),조용호(Yong Ho Cho),박서준(Seo Jun Park),박문균(Mun Kyun Park) (사)한국생물환경조절학회 2005 생물환경조절학회지 Vol.14 No.2
본 연구는 기존 비닐하우스 아연도 강관을 사용한 하우스 폭 3.6m와 5m 천창개폐형 대립계 포도 비가림히우스에 대한 구조적 안전성을 검토하고, 인장강도 400Nㆍ㎜?²(SGH400 등) 이상의 파이프를 사용하는 조건에서 하우스 폭 5m인 천창개폐형 대립계 포도 비가림하우스에 대하여 구조적으로 안전한 최적 파이프 규격을 제시하고자 수행하였다. 주기둥 3m×서까래 60㎝인 천창개폐형 3.6m 비가림하우스의 경우, 적설심 35㎝에서는 구조적으로 안전한 것으로 분석되었으나 측면 및 전후면 풍속 35mㆍs?¹에서는 불안전한 것으로 나타났으며, 동일 주기둥과 서까래 간격을 갖는 천창개폐형 5m 비가림하우스의 경우에는 적설심 35와 풍속 35mㆍs?¹에서 모두 불안전하여 구조보강이 필요한 것으로 분석되었다. 그리고 동일 주기둥과 서까래 간격을 가지나 인장강도 400Nㆍ㎜?² 이상을 갖는 파이프를 사용하는 조건에서 천창개폐형 5m 비가림하우스의 최적 파이프 규격은 지붕높이 1.6m(아치형)와 지붕높이 1.8m(복숭아형)에 대하여 동일하게 두 경우로 규격화할 수 있었다. 즉, 안전풍속 35mㆍs?¹와 안전적설심 40㎝에서 구조적으로 안전한 서까래 규격은 φ31.8 × 1.5t@600이었으며, 안전풍속 30mㆍs?¹와ss 안전 적설심 35㎝에서는 서까래 φ25.4 × 1.5t@600인 것으로 분석되었다. 덕면으로부터 곡부보까지의 높이는 안전적설심보다는 안전풍속에 직접적인 영향을 미치는 것으로 분석되었으며, 처마를 높임에 따라 측면풍속에 대해서는 방풍벽파이프(측벽서까래)를, 전후면 풍속에 대해서는 마구리기둥의 규격을 강화하여야 하는 것으로 분석되었다. This study was carried out to: (1) analyze structural stability of representative rain-sheltering greenhouses for large-grain grapevine cultivation with widths of 3.6 m and 5 m in case of using the existing pipe for agriculture; (2) present the optimum specification of pipes in the greenhouse with a width of 5 m under the condition of using the pipe of which ultimate strength has been above 400 Nㆍ㎜?²; (3) evaluate stability and also present the optimum specification of pipes as eaves height was augmented. The above analyses were done for greenhouses with roof vents and also with a main-column interval of 3 m and a rafter interval of 60 ㎝, First, the existing 3.6 m greenhouse with a rafter of φ25.4 × 1.5 t@600 was stable for a snow-depth of 35 ㎝ but unstable for a wind velocity of 35 mㆍs?¹. Meanwhile the existing 5 m greenhouse with the same rafter was not stable for a wind velocity of 335 mㆍs?¹ as well as a snow-depth of 35 ㎝. This meant that existing greenhouses had to be reinforced to secure stability. Second, the specification of pipes, especially rafter, could be classified as two cases. One had a structural stability at a safe wind velocity of 35 mㆍs?¹ and a safe snow-depth of 40 ㎝ for which stability the rafter had to be φ31.8 × 1.5 t@600, and the other had a stability at 30 mㆍs?¹-35 ㎝ at the specification of rafter φ25.4 × 1.5 t@600. Finally, eaves height had a significant effect on safe wind velocity. But it had little influence on safe snow-depth. The results showed that the specification of side-wall pipes had to be reinforced for the safe side velocity according to the increment of eaves height and similarly the specification of fore-end post for the safe fore-end velocity.