• 한국자원식물학회:학술대회논문집
• /
• 한국자원식물학회 2018년도 추계학술대회
• /
• pp.88-88
• /
• 2018

In order to increase the germination speed and uniformity of tomato seeds, sonication and modified drum priming treatments were investigated to produce high quality seeds for export. Sonication treatment was performed for 5, 10 and 20minutes at an intensity of 5.2, 10.4 and 15.7kHz in water at $15^{\circ}C$. After sonication treatment, seeds were primed with water or 100mM $KNO_3$ for 4days. 40, 50 and 60% seed moisture content (SMC) of hydrated seeds were incubated for 60, 72 and 84h in a container with a relative humidity of 99% at 26rpm for a modified drum priming treatments. Germination speed were highly improved by sonication with osmotic priming. The seed treatment of osmotic priming or hydro priming after sonication or sonication without priming enhanced germination percentage (GP) on the $2^{rd}$day after sowing to 46%, 43% and 28%, respectively, while untreated seeds resulted in only 1% GP. These treatments also highly improved mean germination time (MGT) to 1.4, 1.8 and 2.6days, respectively, when compared to 3.5days MGT of untreated seeds. The modified drum priming treatment (72h incubation after 60% SMC hydration) significantly improved results of 74% GP(on the $3^{rd}$day after sowing), 2.6days MGT and $39%{\cdot}day^{-1}$ germination rate (GR), however, untreated seeds showed 19% GP, 4.1 MGT, and $25%{\cdot}day^{-1}$ GR. Although osmotic priming after sonication, hydro priming showed similar improved germination characteristics, however, modified drum priming is considered as an industrially promising treatment methods considering the shortening of the treatment period and environment-friendly aspects.

• 동의생리병리학회지
• /
• 제17권2호
• /
• pp.503-509
• /
• 2003

The purpose of this study is to examine the toxic effects caused by xanthine oxidase/hypoxanthine (XO/HX) and the effects of herbal extracts such as Mangeum-tang (萬金湯: MGT) and Gamimangeum-tang (加味萬金湯: GMGT) on the treatment of the toxic effects. The results of these experiments were XO/HX, an oxygen radical-generating system, decreased the survival rates of the cultured cells on XTT assay, the amount of DNA syntheses, and the amount of neurofilaments, and increased c-fos positive cells, MGT and GMGT have the efficacy of increasing the survival rates of the cultured cells by increasing the amount of neurofilaments and DNA synthesis and decreasing the c-fos positive cells damaged by XO/HX, From the above results, it is suggested that MGT and GMGT have marked efficacy as a treatment for the damages caused by the XO/HX-mediated oxidative stress. And MGT and GMGT are thought to have certain pharmacological effects.

• 한국신재생에너지학회:학술대회논문집
• /
• 한국신재생에너지학회 2005년도 춘계학술대회
• /
• pp.463-466
• /
• 2005

As the distributed generation becomes more reliable and economically feasible, it is expected that a higher application of the distributed generation units would be interconnected to the existing grids. This new generation technology is linked to a large number of factors like economics and performance, safety and reliability, market regulations, environmental issues, or grid connection constrains. KEPOD (Korea Electric Power Corporation) is performing the project to develope the Distributed Micro Gas Turbine (MGT) technologies by using Swine BID-ENERGY. This paper describes the plans and strategies for the renewable energy of MGT on actual grid-connection under Korean situations. KEPOD also, has a research plan on bio-gas pretreatment system applicable to our domestic swine renewable resources and is performing concept design of pilot plant to test grid operation. In addition, this testing will be conducted in order to respond to a wide variety of needs for application and economic evaluation in the field of On-site generation.

• 한국전산유체공학회:학술대회논문집
• /
• 한국전산유체공학회 2008년도 춘계학술대회논문집
• /
• pp.260-263
• /
• 2008

KEPCO(Korea Electric Power Corporation) is performing the nation's first biogas-MGT project as an effort to encourage the utilization of wasted biogas which contains useful CH4. The goals of this project are to develop the Pretreatment system of Livestock bio-gas and set up the biogas-MGT co-generation system. The project will not only utilze flared biogas as precious energy but also improve the economics of the plant a lot. The pretreatment system mainly consists of sulfur removal tower, biogas compressor and many filtering systems. A computational fluid dynamics study in the bio gas sulfur removal tower and sulfur absorption filter was carried out. Understanding of the flow in the sulfur removal tower and sulfur adsorption filter obtained by this study can be used to identify the problems in the sulfur removal tower and to improve the sulfur removal efficiency of the sulfur removal tower. Resistance material modeling is used to simulate the sulfur adsorption filter, and the resistance coefficient was adjusted to reflect the experimental pressure loss value. And the pressure loss change with the flowrate is predicted

• 대한기계학회논문집B
• /
• 제39권4호
• /
• pp.371-378
• /
• 2015

전기자동차 레인지 익스텐더는 소형 엔진으로 구동되는 발전기 시스템(초소형 파워팩)으로서 자동차 운행 중 지속 충전을 통하여 운전 거리 및 시간을 연장한다. 기존 가솔린 엔진 파워팩은 복잡한 구조와 낮은 에너지 밀도로 인하여 고출력 소형 시스템 구현에 한계가 있다. 반면, 가스터빈 파워팩은 출력밀도가 매우 높고 고속화를 통해 시스템의 소형화가 가능하다. 본 연구에서는 전기자동차 레인지 익스텐더로 활용하기 위하여 초소형 가스터빈, 자동차용 알터네이터, 배터리를 사용한 초소형 가스터빈 파워팩 실험장치를 개발하고, 무부하 및 부하 조건에서 동력전달 기어비 및 알터네이터 전기부하에 따른 운전 특성 및 발전 성능을 측정하였다. 실험 결과, 부하 변화에 따른 발전 성능의 변화는 없었으며, 코어터빈 속도가 150 krpm 일 때 최대 전기적 출력은 0.8 kW 로 측정되었다. 또한, 동력축의 3:1 감속을 통해 전기적 출력은 1.5 kW 로 88% 증가하였다. 따라서, 본 연구의 초소형 가스터빈 파워팩은 배터리 부하변동에 대해 안정적인 전력생산이 가능하며, 전기자동차용 레인지 익스텐더로 적용가능함을 확인하였다.

• 전력전자학회지
• /
• 제8권3호
• /
• pp.35-38
• /
• 2003

• 한국연소학회지
• /
• 제19권4호
• /
• pp.21-27
• /
• 2014

MGT (micro gas turbines) have been gaining particular attentions with a variety of commercial and military applications due to their advantages such as compact size, simple operability, easy maintenance, and low emissions. This study deals with development processes of an annular combustor applied to MGT. Preliminary design methodologies are used to size the main components of the combustor. Key design features such as liner temperatures and pressure losses are evaluated. Results show that the estimated liner temperatures are within acceptable range. Dominant factors for pressure losses are estimated to be air admission holes and burner swirlers.

• 한국신재생에너지학회:학술대회논문집
• /
• 한국신재생에너지학회 2008년도 춘계학술대회 논문집
• /
• pp.239-242
• /
• 2008

As the distributed generation becomes more reliable and economically feasible, it is expected that a higher application of the distributed generation units would be interconnected to the existing grids. In this context, the Micro Gas Turbines (MGT) by using Bio-gas is being considered as a promising solution. In order to propose a feasible concept of those technologies such as improving environmental effect and economics, we performed a sensitivity study for a biomass fueled MGT using a simulation model. The study consists of 1) the fundamental modeling using manufacturer's technical specifications, 2) the correction with the experimental data, and 3) the prediction of off-design characteristics. The performance analysis model was developed by PEPSE-GT 72, commercial steam/gas turbine simulation technicque.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2006년도 제37회 하계학술대회 논문집 A
• /
• pp.547-548
• /
• 2006

This paper deals with the power quality of Micro Gas Turbine(MGT) generation system which is connected with distribution system. Measurements to evaluate the power quality of MGT generation system are performed with parameters that are frequency, voltage change, harmonics and flicker and then Parameters are evaluated.

• 유체기계공업학회:학술대회논문집
• /
• 유체기계공업학회 2001년도 유체기계 연구개발 발표회 논문집
• /
• pp.354-360
• /
• 2001

Hybrid energy system of fuel cell and gas turbine is discussed as the system to be used in the distributed power generation. Discussion is first directed to the distributed power generation system which is expected to be more popularly introduced both in urban and isolated areas. In the next some characteristic features of fuel cell and micro gas turbine are shortly described. In the last discussion is turn to the fuel cell and micro gas turbine hybrid system. In particular, performance characteristics of a representative SOFC/MGT hybrid system are investigated through the concept design at various power capacity levels.