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상온 2단 선회류 유동층 연소로에서 미세입자의 비산유출속도에 대한 상단 가스공탑속도의 영향
신용섭,장정국,임준혁,이제근,전해수 ( Yong Seop Shin,Jeong Gock Jang,Jun Heok Lim,Jea Keun Lee,Hai Soo Chun ) 한국화학공학회 1995 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.33 No.1
The elutriation rate of fine particles were measured in a cold model Two-Stage Swirl-Flow Fluidized Bed Combustor(TSSF-FBC). The range of secondary air flow rate was varied from 0.1 m/s to 0.35 m/s while the primary air flow rate was kept to a constant value of 1 m/s. It was found that the elutriation rate of fine particles slightly increased with the secondary superficial air velocity. When the secondary superficial air velocity exceeded over 0.3 m/s, however, the elutriation rate rapidly increased. The elutriation rate of fine particles was strongly dependent upon the swirl intensity. It was exponentially decreased as the swirl intensity increased. The elutriation rate constant increased with the secondary superficial air velocity, and the critical particle diameters were in range of 83-88 ㎛. Under the experimental conditions, the elutriation rate constant of fine particles can be correlated with secondary excess air velocity(U_(o₂)-U_(mf)) and d_p/d_(p100) as follows; K^*(d_p)/P_g(U_(o₂)-U_(mf))=337.7(U_(o₂)-U_(mf))^(3.6)exp(-7.18d_p/d_(p100))+2.54(U_(o₂)-U_(mf))^6
신용섭,홍익표,김영수,박한규,Shin Yong-Seop,Hong Ic-Pyo,Kim Young-Soo,Park Han-Kyu 한국전자파학회 2006 한국전자파학회논문지 Vol.17 No.1
본 논문에서는 임의 위치에서 기존의 무선 통신 시스템에서 사용되는 주파수 대역이 전체 스펙트럼 자원에 존재하는 비율로서 정의되는 스펙트럼 사용 계수를 이용하여 스펙트럼 사용량을 정량적으로 나타내는 방법을 제안하였다. 기존 무선 시스템과 동일 공간에서 스펙트럼을 사용하기 위해 기존 시스템의 안테나 패턴과 송신 전력 등의 함수로 스펙트럼 사용 계수를 나타내었고, 계산된 결과를 서울 지역의 실제 고정 서비스 무선국에 적용하여 스펙트럼 사용량을 계산하였다. 본 논문에서 나타낸 스펙트럼 사용 계수를 이용하면 새로운 무선 시스템을 동일 공간에서 사용하고자 하는 경우 사용되는 스펙트럼을 정량적으로 나타낼 수 있기 때문에, 스펙트럼이 사용되지 않는 공간을 단순한 빈 공간이 아닌 정량적으로 나타낼 수 있게 되어 스펙트럼 공간을 효율적으로 사용할 수 있다. In this paper, spectrum use factor as the ratio between used spectrum bandwidth by the existing system and total spectrum resources at specific locations was derived and calculated. Spectrum use factor was also presented as a function of antenna patterns and transmitter power of existing systems. Real spectrum use factor was calculated for fixed radio station as a validity of this paper. With the results of this paper, we can use the spectrum more efficiently because the white space of spectrum space is replaced by the quantificated spectrum space.
MPLS-TP 망을 위한 중앙 집중형 망 구성 프로토콜 설계 및 구현
신민섭(Min Seop Shin),박광수(Kwang Su Park),김현필(Hyun Pil Kim),신용섭(Yong Seop Shin),최진식(Jin Seek Choi) 대한전자공학회 2011 대한전자공학회 학술대회 Vol.2011 No.12
In this paper, we propose a centralized topology discovery protocol for MPLS-TP networks. LLDP (IEEE 802.1ab) protocol is used to exchange L2 neighbor information in MPLS-TP network. The centralized server collects the L2 neighbor information for all nodes through the proposed G-TOP protocol. The G-TOP protocol is an extension of GMPLS PCEP protocol (RFC 5440) for topology discovery by using the out-of-band communication channel. Based on the L2 neighbor information, the centralized server can construct network topology for the MPLS-TP network.
상온 2 단 선회류 유동층에서 상단으로의 입자 유입속도
장정국,신용섭,최용준,이제근,전해수 ( Jeong Gook Jang,Yong Seop Shin,Yong Jun Choi,Jea Keun Lee,Hai Soo Chun ) 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.3
The rate of particles entrained from the lower stage to the upper stage according to the primary superficial air velocity are investigated in a cold model two-stage swirl-flow fluidized bed combustor. The total entrainment rate increases with the primary superficial air velocity and ranges from 35 percent to 48 percent of particles fed into the lower bed under the operating conditions(U_(o1)=0.9-1.3 m/s). The particles whose terminal velocity is higher than the primary superficial air velocity may not be entrained from lower stage to the upper stage. However, in the case of particles whose terminal velocity is lower than the primary superficial air velocity, the entrainment rate of particles increases as the particle size becomes smaller and/or the primary superficial air velocity increases. Further, the particles whose dimensionless slip velocity approaches to unity are almost entrained. The entrainment rate can be correlated with the dimensionless slip velocity as follows: (수식)