• Proceedings of the Korean Society of Propulsion Engineers Conference
• /
• 2017.05a
• /
• pp.739-745
• /
• 2017

Research of ADN-based monopropellant thruster is progressed by developed countries in Europe to replace toxic hydrazine, and ADN-based monopropellant thruster system is the only system that was proved in space environment. In this research, ADN-based propellant and catalyst was fabricated to develop ADN-based monopropellant thruster, and catalytic combustion performance with fabricated propellant and catalyst were evaluated with DSC-TG analysis. Catalytic combustion of propellant and catalyst was determined with firing test using 5 N scale liquid monopropellant thruster.

• Journal of the Korean Society of Propulsion Engineers
• /
• v.24 no.4
• /
• pp.79-88
• /
• 2020

Hypergolic propellants have been widely used for space propulsion systems based their long-term storability and high ignition reliability. Since conventional hypergolic propellants are highly toxic and carcinogenic, handling and operating costs are significant. To overcome the drawbacks, numerous studies have been actively performed to develope new hypergolic propellants, ensuring that the combinations are high performance, low toxicity and low environmental impact. In the present study, a comprehensive survey was conducted to summarize the research and development of green hypergolic propellants involving hydrogen peroxide, nitric acid, and ionic liquids.

• Proceedings of the Korean Society of Propulsion Engineers Conference
• /
• 2011.11a
• /
• pp.645-648
• /
• 2011

Hydrazine which has been used as monopropellant shows high performance, but because of its high toxicity research for new green propellant that could replace hydrazine is going on. Ionic liquid propellant that is one of the green propellant has lower toxicity, higher specific impulse, and higher density than hydrazine. To design the thruster which use Hydroxylamine Nitrate (HAN), one of ionic liquid propellant, as a propellant, a quantity of catalyst for full decomposition of a propellant is needed. In this study, reference point for HAN thruster design could be suggested through a design of a small scale thruster which used HAN propellant, and propellant decomposition capability evaluation with characteristic velocity efficiency.

• Journal of the Korean Society for Aeronautical & Space Sciences
• /
• v.47 no.9
• /
• pp.649-657
• /
• 2019

Hydrazine, which is used as a representative monopropellant, is an extremely poisonous substance and has a disadvantage that it is harmful to the human body and is very difficult to handle. In recent years, research on the development of non-toxic and environmentally friendly propellants has attracted much attention. Ammonium dinitramide(ADN) based propellant developed by Swedish Space Corporation has superior performance to hydrazine and has been commercialized through performance verification in space environment. On the other hand, the exhaust gas from a thruster nozzle collides with a satellite while it is spreading in the vacuum space, thermal load and surface contamination may occur and may reduce the performance and lifetime of the satellite. However, a study on the effect of the exhaust gas of the green propellant thruster on the satellite has not been conducted in earnest yet. Therefore, the exhaust gas behavior in space was analyzed in this study for the ADN based green monopropellant using Navier-Stokes equations and the DSMC method. As a result, it can be expected to be used as design validation data in the development of satellite when using the ADN based green monopropellant.

• THE HEALTH and ORGANIC FARMING
• /
• no.231
• /
• pp.1-12
• /
• 2006

제28회 한국유기농업대회 준비돌입/환경호르몬으로부터 자유로워질수 있는 길/우리의 산야초/연속 강우에 따른 과일나무 잎의 갈변에 대하여/벼 멀칭재배의 이론과 기술/김제지평선축제, 성공적으로 개최돼/신태인 유기농 포도축제 성료/질병 예방을 위한 식사/일본,고령화와 웰빙 붐으로 건강식품시장 '폭발'/스위스,유기농가 급속 확산/LA,'건강빵'경쟁 후끈~후끈/일본,학교급식용 중국산 냉동가지 풋콩에서 잔류농약 검출/두가지 비료로 유기농작물의 고품질 다수확 생산을 체계적으로 보다 쉽게 하는 방법/전남도, 전국 최초 '친환경축산 5개년 종합계획'수립/배추 노균병 어떤 병인가?/고추.방울토마토 증수/중국 박람회 및 유기농장 연수기/"유기가공식품" 인증 법제화 추진/국내외 친환경 농축산물의 생산 및 인증 실태/친환경 유기낙농의 정착 방안/9월중 새식구 명단/농촌진흥청,토양전자지도,휴대폰 영농정보 제공/친환경인증기관협의회 출범/친환경농자재'목록공시제'시행/충주시,친환경바이오농업 확대 추진/제주,친환경농업 발전전략 심포지엄 개최/유기 및 일반 농산물의 품질 비교에 관한 연구/유기질 비료의 이해

• Journal of the Korean Society of Propulsion Engineers
• /
• v.14 no.4
• /
• pp.46-58
• /
• 2010

Hydrogen peroxide(HP) and liquid methane have deserved renewed considerations as green propellants in recent years, because main design concerns in the development of the new generation propulsion system for spacecrafts are concentrated on low operation cost and environmental cleanness. Although HP has a long history of application to aerospace propulsion systems due to high density, mono-propellant characteristics and low toxicity, it had been replaced by hydrazine and liquid oxygen due to extreme performance requirement during the cold war. But HP has received a renewed interest due to its increased stability and many researches have been conducted to develop high performance LREs(Liquid Rocket Engines) using HP. Liquid methane has also received a new interest in rocket propulsion system for the future space exploration according to its possibility of ISRU(In-Situ Resource Utilization).

• Proceedings of the Korean Society of Propulsion Engineers Conference
• /
• 2017.05a
• /
• pp.1061-1067
• /
• 2017

Since the 1960s hydrazine is used as a propellant to power rocket, satellites or deep space missions. Due to hydrazine's high toxicity and operating cost, the request for Green Propellant as energetic ionic liquids(HAN, ADN), nitrous oxide blends is growing. Nitrous Oxide Fuel Blend(NOFB) having advantage of a bipropellant performance as well as the advantage of a mono-propellant in respect to the simple propellant tank and feed system. It is worth replacing traditional hydrazine based propellant system if handled and designed properly.

• 프린팅코리아
• /
• v.9 no.12
• /
• pp.104-107
• /
• 2010

동국대 RIS 사업단과 서울인쇄센터, 월간 PT는 지난 11월 11일 인쇄정보센터 7총 대강당에서 공동으로 친환경 인쇄 세미나를 개최했다. 아그파코리아(주), 대한잉크(주), 붸처코리아(주), 한솔제지9주)의 협찬과 지식경제부, 대한인쇄기술협회, 일본인쇄산업연합회, 일본 환경보호인쇄추진협의회(E3PA)의 후원으로 진행된 이번 친환경 인쇄 세미나는 친환경 인쇄의 필요성과 사례 발표를 통해 국내 인쇄업계의 접근 방법을 제시했다. 세미나 발표는 일본인쇄산업연합회와 일본 환경보호인쇄추진협의회의 실무진들이 '일본인쇄의 친환경 트렌드 및 E3PA 활동사례'를 발표했으며, 국내에서 친환경 인쇄 인식 확산을 위해 노력을 하고 있는 아그파코리아, 대한잉크, 붸처코리아, 한솔제지에서 국내 인쇄업계에 실질적인 도움과 적용 가능한 친환경 인쇄에 대한 툴과 성공 사례를 소개했다. 한편, 동국대 RIS 사업단에서는 '수출을 위한 친환경 트렌드'를, 서울인쇄센터에서는 '친환경 인쇄진흥을 위한 사업 방안'을 통해 인쇄업계의 새로운 흐름을 제시했다. 서울인쇄센터에서 발표한 '친환경 인쇄진흥을 위한 사업방안'에 대해 소개한다.

• THE HEALTH and ORGANIC FARMING
• /
• no.215
• /
• pp.9.1-9.1
• /
• 2005

친환경농업교육에 쿠폰방식의 바우처제 도입 - 친환경농산물 분류 3개로 축소 추진

• Journal of the Korean Society of Propulsion Engineers
• /
• v.21 no.2
• /
• pp.26-31
• /
• 2017

Environmental problem of the solid propellants is an issue of growing importance in solid rocket. For examples, ammonium perchlorate (AP) as an solid propellants oxidizer could create a poisonous gas and atmospheric pollutions, such as HCl. Among the several oxidizers, N-guanylurea dinitramide (GuDN) is an effective candidate substance for eco-friendly oxidizer, which has high performance, pressure exponent, and eco-friendly smog during combustion for solid propellant of gas generator. In this paper, the theoretical analysis of characteristics as a gas generator propellant, propellant manufacturing processability, propellant hardness properties and combustion characteristics were studied.