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김상복(Sangbok Kim),박형호(Hyungho Park),김상수(Sangsoo Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
A novel technique for fine particle beam focusing under the atmospheric pressure is introduced using a radiation pressure assisted aerodynamic lens. To introduce the radiation pressure in the aerodynamic focusing system, a 25 ㎜ plano-convex lens having 2.5 ㎜ hole at its center is used as an orifice. The particle beam width is measured for various laser power, particle size, and flow velocity. In addition, the effect of the laser characteristics on the beam focusing is evaluated comparing an Ar-Ion continuous wave laser and a pulsed Nd-YAG laser. For the pure aerodynamic focusing system, the particle beam width was decreased as increasing particle size and Reynolds number. For the particle diameter of 0.5 ㎛, the particle beam was broken due to the secondary flow at Reynolds number of 694. Using the Ar-Ion CW laser, the particle beam width becomes smaller than that of the pure aerodynamic focusing system about 16 %, 11.4 % and 9.6 % for PSL particle size of 2.5 ㎛, 1.0 ㎛, and 0.5 ㎛ respectively at the Reynolds number of 320. Particle beam width was minimized around the laser power of 0.2 W. However, as increasing the laser power higher than 0.4 W, the particle beam width was increased a little and it approached almost a constant value which is still smaller than that of the pure aerodynamic focusing system. The radiation pressure effect on the particle beam width is intensified as Reynolds number decreases or particle size increases relatively. On the other hand, using 30 ㎐ pulsed Nd-YAG laser, the effect of the radiation pressure on the particle beam width was not distinct unlike Ar-Ion CW laser.
Nested Mobile Network에서 LMN을 위한 경로 최적화 방안
신민철(MinChul Shin),김상복(SangBok Kim),조인휘(InWhee Joe) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
[1],[2]의 드래프트 문서에서는 Mobile Network 내부에 HA를 두고 이동하는 Mobile Node를 LMN(Local Mobile Node)라 정의하고 있다. NEMO Basic Support를 기반으로 Nested Mobile Network에서 LMN의 이동에 대한 패킷 전송 경로를 가정 할 때 이 경로는 일반적인 Nested NEMO의 경우 보다 상당히 복잡한 경로를 가지게 된다. 본 논문에서는 이러한 LMN이 이동할 경우 패킷 전송경로에 대해 분석하고, Nested NEMO에 MANET을 적용하여 LMN의 이동에 대한 경로 최적화 방안을 제안하고자 한다.
서울 초등학교 교실의 PM<sub>2.5</sub> 및 PM<sub>10</sub> 제거를 위한 학교용 공기청정기 실증
한방우,홍기정,신동호,김학준,김용진,김상복,김상우,황청하,노광철,Han, Bangwoo,Hong, Keejung,Shin, Dongho,Kim, Hakjoon,Kim, Yongjin,Kim, Sangbok,Kim, Sangwoo,Hwang, Cheongha,Noh, Kwangchul 한국입자에어로졸학회 2019 Particle and Aerosol Research Vol.15 No.2
It is important to control fine particles in children care centers, elementary schools, elderly care facilities and so on where vulnerable children and the aged stay during most of their time. This study has investigated $PM_{2.5}$ and $PM_{10}$ concentrations in two classrooms equipped with an air cleaner and two air cleaners, respectively and they were compared to those in a classroom without an air cleaner as well as those outdoors. Eight air cleaners which have various clean air delivery rates (CADRs) between 9.9 and $21.3m^3/min$ were tested in classrooms in two elementary schools in Seoul. Average $PM_{2.5}$ and $PM_{10}$ were $7.3{\pm}0.7$ and $45.5{\pm}4.1{\mu}g/m^3$ in classrooms equipped with an air cleaner and $4.2{\pm}0.6$ and $24.6{\pm}2.5{\mu}g/m^3$ in classrooms with two air cleaners, whereas they were $22.1{\pm}2.6$ and $109.1{\pm}9.6{\mu}g/m^3$ in classrooms without an air cleaner and $36.9{\pm}5.1$ and $74.1{\pm}10.6{\mu}g/m^3$ outdoors, respectively. $PM_{2.5}$ in classrooms could be reduced effectively by using an air cleaner or two air cleaners, because $PM_{2.5}$ was mainly infiltrated from outdoors, however $PM_{10}$ could not because $PM_{10}$ was mainly caused indoors by students' activities. Air cleaners were more effective for removal of $PM_{2.5}$ and $PM_{10}$ in classrooms with a high airtightness than those in classrooms with a relatively low one. Average $CO_2$ in classrooms was about 1500 to 2000 ppm for class hours dependent on the student number per a classroom, which was about 1.5 to 2 times higher than the standard, regardless of the use of air cleaner.