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소형엔진의 배출가스측정방법에 따른 질소산화물 및 매연에 관한 연구
한영출,나완용,오용석,문병철,박봉규,박귀열 한국공작기계학회 2001 한국생산제조학회지 Vol.10 No.3
Recently, increasing usage of diesel vehicle, many countries try to reduce the pollutant materials by emission regulation standard. Particularly, in our country, the supplement ratio of diesel vehicle is high, and air pollution by vehicle exhaust gas is very serious. So, in study, we tested exhaust gas by various mode in light duty diesel engine. Therefore, we can know about NOx and smoke seriousness.
Development of a High-Current, Long-Pulse Ion Source
Byung-Hoon Oh,Beom Yeol Kim,Byung-Joo Yoon,Dae-Sik Chang,Doo-Hee Chang,Jung-Tae Jin,Kwang-Won Lee,Min-Seok Seo,Sang-Ryul In,Seung Ho Jeong,Jinchoon Kim,Tae-Seong Kim 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.3
A high-current, long-pulse ion source has been developed as a prototype for the neutral beam heating system of the KSTAR tokamak. The ion source was designed to create a 120 keV deuterium beam with a divergence of 1℃ and a proton ratio of 80%. Also, the design considered a long-pulse beam for 300 seconds to support a long-pulse plasma for the KSTAR. The developed ion source was tested with hydrogen beams and the results are as follows: (1) The maximum beam current was 52 A at 100 keV during 2 seconds. (2) The longest beam was a 300-second, 24-A beam at 70 keV. (3) The beam divergence could be controlled to less than 1℃. (4) The proton ratio of the extracted beam was more than 80%. A high-current, long-pulse ion source has been developed as a prototype for the neutral beam heating system of the KSTAR tokamak. The ion source was designed to create a 120 keV deuterium beam with a divergence of 1℃ and a proton ratio of 80%. Also, the design considered a long-pulse beam for 300 seconds to support a long-pulse plasma for the KSTAR. The developed ion source was tested with hydrogen beams and the results are as follows: (1) The maximum beam current was 52 A at 100 keV during 2 seconds. (2) The longest beam was a 300-second, 24-A beam at 70 keV. (3) The beam divergence could be controlled to less than 1℃. (4) The proton ratio of the extracted beam was more than 80%.
Static and Fatigue Behavior of RC Beams Strengthened with Steel Plates
Oh, Byung-Hwan,Cho, Jae-Yeol,Cha, Soo-Won Korea Concrete Institute 2002 KCI concrete journal Vol.14 No.1
Strengthening of existing concrete structures is a major concern in recent years as the number of degraded structures increases. The purpose of this paper is to investigate the static and fatigue behavior of reinforced concrete (RC) beams strengthened with steel plates. To this end, a comprehensive test program has been set up and many series of strengthened beams have been tested. The major test variables include the plate thickness, adhesive thickness, and the shear-span to depth ratio. The test results indicate that the separation of plates is the dominant failure mechanism even for the full-span-length strengthened beams with steel plate. The theoretical ultimate load capacities for strengthened beams based on the full composite action of concrete beam and steel plate are found to be larger than the actual measured load capacities. The strengthened beams exhibit more dominant shear cracking as the shear-span to depth ratio decreases. The ultimate capacity of strengthened beams increases slightly with the increase of adhesive thickness, which may be caused by the late initiation of plate separation in the beams with thicker adhesive. A realistic concept of ductility for plate-strengthened beams is proposed in this study. It is seen that the strengthened beams show relatively low ductility compared with unstrengthened beams. The present study indicates that the strengthened beams exhibit much higher fatigue resistance than the unstrengthened beams. The increase of deflections of strengthened beams according to the number of load cycles is much smaller than that of unstrengthened beams. The present study provides very useful results for the realistic application of plate-strengthening method in reinforced concrete structures.
Oh, Seung Min,Kim, Min Ju,Hosseindoust, Abdolreza,Kim, Kwang Yeol,Choi, Yo Han,Ham, Hyung Bin,Hwang, Sung Jun,Lee, Jun Hyung,Cho, Hyun Jong,Kang, Wei Soo,Chae, Byung Jo Asian Australasian Association of Animal Productio 2020 Animal Bioscience Vol.33 No.6
Objective: This study was conducted to investigate the effects of hot-melt extruded ZnO nano-particles (HME-ZnO) as an alternative for P-ZnO on growth performance, nutrient digestibility, Zn bioavailability, intestinal microbiota, and intestinal morphology of weanling pigs. Methods: A total of 450 piglets (Landrace×Yorkshire×Duroc) were randomly allotted to five treatments based on initial body weight and sex. The experimental diets were fed in a meal form as phase 1 from d 0 to 14 and phase 2 from d 15 to 28. Treatments were the control diet without ZnO supplementation, the diet containing 2,500 ppm Zn as ZnO, and three diets containing 500, 1,000, or 2,500 ppm Zn as HME-ZnO. Results: The overall result showed a higher (p<0.01) average daily gain in weanling pigs fed ZnO-supplemented diets in comparison to the control diet. There was a decrease (p<0.01) in fecal score in the ZnO-supplemented diets. Dietary supplementation of ZnO improved (p<0.05) crude protein digestibility. The weanling pigs fed the P-ZnO diet had a lower (p<0.01) Zn digestibility in the feces than HME-ZnO supplemented treatments. Weanling pigs fed diets supplemented with ZnO had greater (p<0.05) Lactobacillus spp. populations and lower Clostridium spp. (p<0.05) and Coliforms (p<0.01) populations in the ileum. Weanling pigs fed diets supplemented with increasing concentrations of HME-ZnO linearly decreased Clostridium spp. (p<0.05) and Coliforms (p<0.01) in the ileum. Lower (p<0.05) Clostridium spp. and Coliforms counts in the colon were observed in pigs fed with ZnO-supplemented diets. Weanling pigs fed diets supplemented with ZnO showed a greater (p<0.01) villus height in the duodenum. Conclusion: Dietary supplementation of HME-ZnO and P-ZnO showed a potential to improve the digestibility of protein, intestinal Coliform and Clostridium, villus height in duodenum and ileum. Moreover, HME-ZnO showed a higher Zn digestibility compared with P-ZnO.
Electrical conductivity images of biological tissue phantoms in MREIT
Oh, Suk Hoon,Lee, Byung Il,Woo, Eung Je,Lee, Soo Yeol,Kim, Tae-Seong,Kwon, Ohin,Seo, Jin Keun IOP Pub 2005 PHYSIOLOGICAL MEASUREMENT Vol.26 No.2
<P>We present cross-sectional conductivity images of two biological tissue phantoms. Each of the cylindrical phantoms with both diameter and height of 140 mm contained chunks of biological tissues such as bovine tongue and liver, porcine muscle and chicken breast within a conductive agar gelatin as the background medium. We attached four recessed electrodes on the sides of the phantom with equal spacing among them. Injecting current pulses of 480 or 120 mA ms into the phantom along two different directions, we measured the <I>z</I>-component <I>B<SUB>z</SUB></I> of the induced magnetic flux density <B>B</B> = (<I>B<SUB>x</SUB></I>, <I>B<SUB>y</SUB></I>, <I>B<SUB>z</SUB></I>) with a magnetic resonance electrical impedance tomography (MREIT) system based on a 3.0 T MRI scanner. Using the harmonic <I>B<SUB>z</SUB></I> algorithm, we reconstructed cross-sectional conductivity images from the measured <I>B<SUB>z</SUB></I> data. Reconstructed images clearly distinguish different tissues in terms of both their shapes and conductivity values. In this paper, we experimentally demonstrate the feasibility of the MREIT technique in producing conductivity images of different biological soft tissues with a high spatial resolution and accuracy when we use a sufficient amount of the injection current.</P>
Park, Byung Hyun,Oh, Seung Jun,Jung, Jae Hwan,Choi, Goro,Seo, Ji Hyun,Kim, Do Hyun,Lee, Eun Yeol,Seo, Tae Seok Elsevier Applied Science 2017 Biosensors & bioelectronics Vol. No.
<P><B>Abstract</B></P> <P>Point-of-care (POC) molecular diagnostics plays a pivotal role for the prevention and treatment of infectious diseases. In spite of recent advancement in microfluidic based POC devices, there are still rooms for development to realize rapid, automatic and cost-effective sample-to-result genetic analysis. In this study, we propose an integrated rotary microfluidic system that is capable of performing glass microbead based DNA extraction, loop mediated isothermal amplification (LAMP), and colorimetric lateral flow strip based detection in a sequential manner with an optimized microfluidic design and a rotational speed control. Rotation direction-dependent coriolis force and siphon valving structures enable us to perform the fluidic control and metering, and the use of the lateral flow strip as a detection method renders all the analytical processes for nucleic acid test simplified and integrated without the need of expensive instruments or human intervention. As a proof of concept for point-of-care DNA diagnostics, we identified the food-borne bacterial pathogen which was contaminated in water or milk. Not only monoplex <I>Salmonella Typhimurium</I> but also multiplex <I>Salmonella Typhimurium</I> and <I>Vibrio parahaemolyticus</I> were analysed on the integrated rotary genetic analysis microsystem with a limit of detection of 50 CFU in 80min. In addition, three multiple samples were simultaneously analysed on a single device. The sample-to-result capability of the proposed microdevice provides great usefulness in the fields of clinical diagnostics, food safety and environment monitoring.</P> <P><B>Highlights</B></P> <P> <UL> <LI> An integrated rotary microsystem for point-of-care DNA diagnostics was demonstrated. </LI> <LI> The extraction, amplification and detection of DNA were integrated in a single disc. </LI> <LI> Food borne pathogens were successfully identified on the microdevice with a RPM control. </LI> <LI> The sample-to-result capability of the proposed microdevice would be adequate in early diagnosis. </LI> </UL> </P>
Basic setup for breast conductivity imaging using magnetic resonance electrical impedance tomography
Lee, Byung Il,Oh, Suk Hoon,Kim, Tae-Seong,Woo, Eung Je,Lee, Soo Yeol,Kwon, Ohin,Seo, Jin Keun Institute of Physics in association with the Ameri 2006 Physics in medicine & biology Vol.51 No.2
<P>We present a new medical imaging technique for breast imaging, breast MREIT, in which magnetic resonance electrical impedance tomography (MREIT) is utilized to get high-resolution conductivity and current density images of the breast. In this work, we introduce the basic imaging setup of the breast MREIT technique with an investigation of four different imaging configurations of current-injection electrode positions and pathways through computer simulation studies. Utilizing the preliminary findings of a best breast MREIT configuration, additional numerical simulation studies have been carried out to validate breast MREIT at different levels of SNR. Finally, we have performed an experimental validation with a breast phantom on a 3.0 T MREIT system. The presented results strongly suggest that breast MREIT with careful imaging setups could be a potential imaging technique for human breast which may lead to early detection of breast cancer via improved differentiation of cancerous tissues in high-resolution conductivity images.</P>