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MSW Stoker Incinerator O2농도 조절에 따른 대기배출가스농도 저감 특성 연구
송현석,김성만,김명호 한국폐기물자원순환학회 2015 한국폐기물자원순환학회 학술대회 Vol.2015 No.11
K시의 소각장은 2000년 5월 시험가동으로 2기(연속식 스토커방식) 처리시설로 160ton/day*2기, 320ton/day의 생활쓰레기를 처리하면, 소각시설 공정도는 Fig. 1과 같다. 소각과정에서 생성되는 폐열을 회수, 증기를 발생시켜 이 증기를 이용해서 시설내 열원 및 소비전력을 보충하는 설비시설을 갖추고 있다. 그러나 Fig. 2와 같이 사용 후 4 ~ 5년 후 부터는 O2농도가 증가하고 있는 추세이며 2호기의 산소농도가 1호기 보다 높아지고 있어 배기가스 중 CO, SOx, HCl, NOx의 농도는 증가 하는 것으로 나타나고 있다. 본 연구는 2기 소각로에 O2농도에 맞게 송풍량을 적정주입하는 방법으로 개선하여 대기배출가스 농도를 저감하기 위한 연구이다. 대기배출가스농도는 전년도 대비 NOx 5.5%, HCl 17.4%, SOx 38.5%로 저감, CO 5.7%, 먼지(Dust) 15.0% 증가 되었고, 초과횟수는 저감 중점항목을 선정하여 실시한 결과 2011년 107회에서 2012년 9월까지 62회로 전년도 대비 42.1%가 감소하고, 약품사용량은 전년도 소각량 대비 11.2% 증가한, 반면 소석회는 3.8%, 암모니아 4.5%, 활성탄은 4.4% 감소하였다. 연구결과 DCS프로그램 적용하여 O2농도 조절로 대기배출가스농도와 비례관계를 나타냈으며, MSW로 보일러에 O2농도 조절을 하므로 대기가스배출농도가 법적기준 이내로 유지함을 알수 있다.
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송현석,임청환,정홍량,김종성,김영란,정성훈 대한방사선과학회 2022 방사선기술과학 Vol.45 No.4
The proportion and testing of portable radiation tests, which are limited at the request of the doctor, are gradually increasing only for patients in emergency situations and difficulties in moving. However, as there are many limiting factors compared to fixed devices, this study intends to measure and analyze the distortion of images according to the angle of the detector and the change in dose according to the position of the subject. For distortion experiments using a mobile radiation generator used in Hospital A, the SID was tilted by 110 cm, 14"×17" wireless FPD detector to 0°, -5°, -10°, -15°, -20°, and -35° to measure the change in area. The dose according to the location of the detector was analyzed on average by measuring the central dose at 110 cm of the SID and measuring the dose of 9 locations three times each. The analysis result of distortion by location according to the angle of the detector showed a statistically significant difference (f=58.74, p<0.000). Therefore, it can be seen that the angle of the detector and the tube is closely related to the distortion of the image. The difference in dose by location of the detector increased with respect to the center - pole, and decreased with the + pole. Tests using mobile radiation generators will require careful efforts by clinicians to position patients in the center of the detector for accurate diagnosis, and efforts will be made to level the angle between the mobile radiation generators and the detector.
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Random Walk Deposition with relaxation
송현석,Jin Min Kim 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.44 No.32
We study a random walk deposition model with relaxation. In our model, the surface width W(t;L) increases as t in the early time and approaches L at a later time, where L is the system size. We obtain 2:16, i.e. larger than 1. The height correlation function G(r; t;L) has anomalous scaling behaviors with loc 0:88, which is the local roughness exponent. Since > 1 and loc < 1, our model has an intrinsic anomalous roughening behavior.
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송현석,김진민 한국물리학회 2003 새물리 Vol.47 No.4
We study a random deposition model for random walkers. In our model, the surface roughness, W (t,L), increases as t$^{3/4}$ at early time and keeps increasing as t$^{1/2}$ at later times t $\sim$ L$^z$, where L is the system size and z is the dynamic exponent. Even though W (t, L) is not saturated, it follows the Family-Vicsek scaling formula with a special scaling functional form. In our model, the roughness exponent is given by α $\simeq$ 3/2, the growth exponent by $\beta$ $\simeq$ 3/4, and the dynamic exponent by z $\simeq$ 2 are obtained in our model. 잡음이 멋대로 걷기로 주어지는 경우의 Random Deposition(RD) 모델을 연구하였다. 우리 모델은 표면 거칠기 $W(t,L)$가 초기에는 $t^{3/4}$으로 증가하다가 $t \sim L^{z}$ 이후에는 $t^{1/2}$으로 증가하는 형태를 보였다. 여기서 $L$은 계의 크기, $t$는 시간, $z$는 동역학 지수를 의미한다. $W(t,L)$가 $t\gg L^{z}$인 영역에서도 계속 증가하는 모델이어서 거칠기 지수가 정의되지 않을 것 같으나 $W(t,L)$가 Family-Vicsek의 축척 관계식을 따르고 있다. 다만, 축척 함수가 특이한 현상을 나타낸다. 우리 모델에서 거칠기 지수 $\alpha \approx 3/2$, 성장 지수 $\beta \approx 3/4$, 동역학 지수 $z \approx 2$를 얻었다. $W(t,L)$가 포화되지 않지만 거칠기 지수가 정의되었다.
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Simulation of temperature rise within a rolling tire by using FE analysis
송현석,정성필,박태원 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.7
A simulation method is proposed to predict temperature rise within a dynamic rolling tire. The friction heat from tire-road contact and the internal heat generated by hysteresis loss caused by rubber deformation are considered in the simulation model. A systematic process was developed to calculate the heat generation rate by using dissipated energy, and it was applied to the simulation model by establishing user subroutines. An axial tensile test was conducted for the rubber specimen, and the obtained stress-strain curve was applied to the simulation model based on the first-invariant Marlow model. The reliability of the simulation method was verified by comparing the tensile simulation and test results. A simplified 3D finite element tire model was developed, and simulations were performed in dynamic rolling conditions. Heat was generated because of friction and internal deformation. The temperature distribution within the tire, which was derived using the model, indicates that the proposed simulation method is reliable.
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Effect of microstructures on the Gilbert damping in Co/Ni multilayers
송현석,이경동,양시훈,손정우,김현중,유천열,박병국,Stuart Parkin,신성철,홍정일 한국물리학회 2016 Current Applied Physics Vol.16 No.10
Proper understanding of spin dynamics in the magnetic multilayer system is a necessary step for the fabrication of practical magnetic devices. In the present study, spin dynamics in the [Co/Ni]N/Ti multilayers at various Co and Ni layer thicknesses were obtained by optical method with the aim to identify the structural effects on the Gilbert damping constant of the multilayer system. It was found that the change of crystallinity and magnetocrystalline anisotropy depending on the relative thicknesses ratio of Co and Ni layers work as the main factor to determine the Gilbert damping behavior.
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중수골 경부 함몰 골절에 의한 발음성 중수수지관절 : 증례 복 Case Report
송현석,최남용,박성진,한석구,나기호,서상일,이도성 대한골절학회 2004 대한골절학회지 Vol.17 No.4
수부 손상 후 염좌로 보존적 치료를 시행하던 환자에게서 중수수지 관절을 신전시 발견된 탄발음에 대하여 시험 절개를 시행하여 중수골 함몰 골절을 진단하였으며, 이에 이전에 보고된 바 없는 중수골 경부 함몰 골절 후에 발생한 발음성 중수수지 관절 1예를 경험하여 이를 보고하고자 한다. We report one case of snapping metacarpo-phalangeal joint after depressed fracture of metacarpal neck which could be diagnosed by exploration for the snapping during extension in spite of conservative treatments.
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칼라 히스토그램과 엔트로피를 이용한 동영상 장면전환 검출
송현석,안강식,안명석,조석제 한국해양대학교 산업기술연구소 2002 연구논문집 Vol.19 No.-
In content-base video data retrieval, the detection for scene change is needed. Color histogram approaches are generally used. Color histogram approaches are simple and more robust to object and camera movements but they ignore the spatial information and fail when two different frames have similar histograms. We propose a new algorithm to use color histogram and entropy to enhance the false-positive occurred by brightness variation and the miss by similar color histogram. At the experiments, it is more robust to brightness variation and have spatial information.
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