연료다단 연소기의 NOx 발생특성에 관한 실험적 연구

정진도(Jindo Chung),안국영(Kookyoung Ahn),한지웅(Jiwoong Han) 한국자동차공학회 2003 한국 자동차공학회논문집 Vol.11 No.6

The characteristics of NOx emission in multi fuel/air staged combustor have been experimentally studied. The design concept of multi fuel/air staged combustor is creation of two separate flame, a primary flame is act as a pilot flame for the secondary combustion stage combustion zone, where most of fuel burns. Experiments were performed on a semi-industrial scale (thermal input 0.233 ㎿) in a laboratory furnace and Liquefied Petroleum Gas(LPG) was used as primary and secondary fuels. The study included parametric study to identify' the optimum operating conditions which are primary/secondary fuel ratio, primary/secondary air ratio, primary swirl intensity and secondary swirl intensity for reducing NOx emission. The test demonstrated that NOx emission can be reduced by >70% in accordance with operating conditions.<br/>

대 면적 기판 집적 PDN의 위상차 문제를 제거하기 위한 유전체 나사를 이용한 가변 기판 집적 도파관

변진도(Jindo Byun),이해영(Hai-Young Lee) 한국전자파학회 2010 한국전자파학회논문지 Vol.21 No.2

본 논문에서는 대 면적 기판 집적 도파관 전력 분배 네트워크(Substrate Integrated Waveguide Power Distribution Network: SIW PDN)의 출력 단자 간 위상차를 제거하기 위해 유전체 나사를 적용한 가변 기판 집적 도파관(SIW: Substrate Integrated Waveguide)을 제안한다. 본 제안 구조는 가변 기판 집적 도파관에 비 도금된 비아 홀에 부분적으로 유전체 나사를 삽입하여 S-parameter의 크기에 거의 영향을 주지 않고 위상 천이를 이룬다. 이로써, 유전체 나사가 삽입되지 않은 가변 기판 집적 도파관이 적용된 대 면적 SIW PDN(370 ㎜×195 ㎜)의 측정된 ±33.9°의 위상 차이가 본 제안 구조를 통하여 ±4.65°까지 크게 감소되었다. 본 논문에서 제안된 유전체 나사를 이용한 가변 SIW는 향후 초경량, 고성능 기판 집적 위상 배열 시스템 및 대 면적 SIW 회로 응용에 중요한 역할을 할 것으로 기대된다. In this paper, we propose a tunable SIW(Substrate Integrated Waveguide) using dielectric screws for eliminating the phase imbalance of large size power distribution networks(PDN). Alumina screws partially inserted into several through holes of the tunable SIW section effectively change the phase shift without S-parameter degradation. ±33.9° measured phase imbalance of a large conventional 9 ㎓ SIW-PDN of 370 ㎜×195 ㎜ size has been greatly reduced to ±4.65°. We expect that the proposed tunable SIW plays an important role for a light-weight, high performance substrate integrated phased array system(Si-PAS) and large size SIW circuit applications.

Characterization of Steam Reforming Catalyst in Solid Oxide Fuel Cell Using Biogas

Chung, Jindo,Han, Yujin Asian Journal of Chemistry 2013 Asian journal of chemistry Vol.25 No.12

Recycling Possibility of Waste Using BMP and AT4 Test

Chung, Jindo,Gong, Heyonggi Asian Journal of Chemistry 2014 Asian Journal of Chemistry Vol.26 No.13

<P>This study analyzed the physical and chemical properties of waste and the biodegradability to present a plan for the re-use of landfills as a basic study on the reuse of landfills. As an analysis result of physical and chemical properties, there were lots of combustible contents (50 %) compared with the analysis result of the existing landfill (30 %). The biodegradability of buried anaerobic (BMP Test) waste was analyzed to be within 11 %. As a result of the aerobic evaluation(AT4 test), the oxygen consumption of buried waste was 5.45 to 19.76 mg O2/g DM and was measured less than 2525 mg O-2/g DM, a pre-stabilization evaluation standard at all the places where the sample had been collected. It seemed to be necessary to seek a plan for the reuse at landfill A by lowering the content of organic foreign materials less than 1 % through the secondary selection using the incineration treatment after drying for combustibles, the reburial for incombustibles and cleaning and wind power for sorting soil.</P>

Study on the Reuse of a Waste Landfill from Physical and Chemical Properties and Biodegradability of Landfill Waste Assessment

Chung, Jindo,Park, Kiryul Asian Journal of Chemistry 2013 Asian journal of chemistry Vol.25 No.12

다기능 케이블을 위한 연성 회로 기판에 내장된 공통 모드 필터

변진도(Jindo Byun),정상운(Sangwoon Jung),이근형(Keun-Hyung Lee),이해영(Hai-Young Lee) 한국전자파학회 2008 한국전자파학회논문지 Vol.19 No.3

본 논문에서는 FPC(Flexible Printed Circuit) 케이블에 적층된 나선형 인덕터를 내장하여 다기능 케이블을 위한 공통 모드 필터를 제안하였다. 공통 모드 필터가 내장된 FPC 케이블은 별도의 SMD(Surface Mounted Device) 필터 없이 연성 케이블과 공통 모드 차단 특성을 가짐으로서, 다기능 케이블이라는 새로운 개념을 제시한다. 내장된 공통 모드 필터는 광대역의 공통 모드 차단 대역을 가지고 손실이 큰 페라이트와 같은 자성 물질을 사용하지 않아 차동 모드 삽입 손실 및 반사 손실이 향상되었다. 3-turn 인덕터를 가진 공통 모드 필터는 공통 모드차단 대역이 0.4~3.12 ㎓이며, 페라이트를 적용한 상용 LTCC(Low Temperature Co-fire Ceramic) 공통 모드 필터에 비해 3 ㎓에서 1.95 ㏈, 8 ㎓에서 6.97 ㏈의 향상된 차동 모드 삽입 손실을 갖는다. In this paper, a spiral shaped common mode filter(CMF) embedded in a flexible printed circuit board(FPCB) is proposed for a multi-function cable. The CMF embedded in a FPC cable presents a new concept as a multi-function cable by the common mode rejection characteristics without a surface mounted device(SMD) CMF. The embedded CMF has a wideband common mode rejection bandwidth and an enhanced differential mode characteristics compared to conventional CMFs that use a magnetic material such as a ferrite of high loss. The proposed CMF of 3 turn inductors has a common mode rejection bandwidth from 0.4 ㎓ to 3.12 ㎓ and has 1.95 ㏈ at 3 ㎓, 6.97 ㏈ at 8 ㎓ improvements of a differential mode insertion loss compared to the commercial LTCC(Low Temperature Co-fire Ceramics) CMFs.

양식 동자개(Pelteobagrus fulvidraco)의 Edwardsiella ictaluri 감염

김진도 ( Jindo Kim ),박성우 ( Sungwoo Park ) 한국수산과학회(구 한국수산학회) 2015 한국수산과학회지 Vol.48 No.5

We observed yellow catfish Pelteobagrus fulvidraco fingerlings cultured in land ponds in Korea swimming in a corkscrew spiral pattern while hanging head-up and tail-down at the water surface, before eventually dying. Externally, these fish displayed “hole in the head” disease, pale gills, and hemorrhages in the base of the pectoral and caudal fins; internally they had liver hemorrhages and kidney discoloration. The bacterium Edwardsiella ictaluri (YCK-01 and YCL-01) was identified in the kidneys and livers of diseased fish via phenotypic characteristics and PCR analysis using the ictaluri-specific primers IVS (an intervening sequence) and IRS (the inter-ribosomal spacer). Infectivity challenges by intraperitoneal and immersion routes showed that a representative bacterial strain (YCK) exhibited strong virulence to yellow catfish, with an LD50 of 3.2 × 104 CFU/fish and 2.5 × 106 CFU/mL, respectively. This is the first report of E. ictaluri infection in yellow catfish from Korea.

양식넙치 조직에서 나타나는 비특이적방어

김진도,고창순,김은희 여수대학교 1998 論文集 Vol.12 No.2

To evaluate the non-specific defence activity of cultured flounder, Paralichthys olivaceus, the antibacterial effect of the serum, skin mucus and homogenate of various organs asainst fish pathogenic bacteria, Aeromonas hydrophila, Edwardsiella tarda, Vibrio anguillarum, Streptococcus sp., and Staphylococcus epidermidis and the activities of lysozyme, proteolytic enzyme and chitinolytic enzyme as non-specific defence factor were investigated. Kidney and liver showed the highest antibacterial activity by lysoplate assay on agar plate mixed with pathogens. Turbidimetric assay was carried out for the lysozyme activity of fish samples against lyophilized cells of Micrococcus lysodeiktikus. The kidney appeared to have the highest activity(96 units/ml), followed in decending order by eye ball, liver and spleen. Activities of proteolytic enzymes and chitinolytic enzymes were involved for antibacterial effects of all samples except mucus too. Therefore, flounder is considered as fish strain having effective defence mechanism based on the antibacterial activities, but low defence effect of mucus is thought to be related with frequent outbreak of disease in flounder.

Interpretation of Absorption Spectra of Some Bisazomethine Dyes in a Crystalline State in Terms of Conformational Change and Exciton Interaction

Takayanagi, Naho,Jindo, Takumi,Kim, Byung-Soon,Son, Young-A,Kim, Sung-Hoon,Matsumoto, Shinya Chemical Society of Japan 2018 Bulletin of the Chemical Society of Japan Vol. No.

시험소간 성능 검증을 위한 벽면 속도 보상 10회선 초음파 유량계 개발

박정규(Jungkyu Park),정진도(Jindo Chung) 한국환경에너지공학회 2023 한국열환경공학회 학술대회지 Vol.2023 No.2

Most wet- type multi-path ultrasonic flowmeters have their measurement accuracy rate to be deteriorated as the flow rate is decreased. Curve-fitting on the characteristics of ultrasonic flowmeters is essential to improve their measurement accuracy rate. This hinders their use as transfer standards in inter-laboratory comparisons for water flow metrology. A breakthrough to enhance the measurement accuracy rate of ultrasonic flowmeters is needed. This study suggests that the concept of near-wall flow velocity should enhance the characteristics of ultrasonic flowmeters. As a result, the repeatability can be improved as low as 土0. 02% which should be suitable to be used as transfer standards. Two main points of using the near-wall flow velocity for ultrasonic flowmeters are emphasized. One is a formula to describe the near-wall flow velocity as a function of both Reynolds number and surface roughness. The other one is the results of comparison calibrations between two national metrology institutes, which can support measurement equivalence. In particular, the number of equivalence is less than one (¦E_n¦ ≤ 1), and the inconclusiveness parameter is less than two (u_comp/u_base≤ 2) if the near- wall flow velocity is applied for ultrasonic flowmeters. This implies that the ultrasonic flowmeters could be used as transfer standards for the forthcoming inter-laboratory comparisons.