• Proceedings of the Korean Vacuum Society Conference
• /
• 2012.08a
• /
• pp.100-100
• /
• 2012

지식경제부의 청정제조기반 산업원천개발사업의 일환으로 진행 중인 "초고진공펌프 개발" 과제 중 제3세부 과제인 "고진공펌프 종합특성평가시스템 설계, 진단기술 개발" 과제에서 진행되고 있는 연구수행결과를 소개한다. 국내 초고진공펌프 개발 수준의 선진화를 위한 기본적인 초석 확립은 현존하는 모든 진공 발생 장치의 국제적 신뢰성이 있는 완벽한 성능평가의 구현에 있다고 할 수 있다. 고진공펌프개발 총괄 과제의 대명제는 "국제적 신뢰성을 가지는 상용화 제품의 완성"이며, 이를 위한 3세부과제의 추진 방향은 기 완료된 1단계 기술개발에 근거한 1세부과제 및 2세부과제와의 유기적인 infra를 통한 성공적인 지원체계 구축 및 상용화 제품 개발 단계의 모든 신뢰성 확보 전략을 수립, 수행하는 것을 골자로 하고 있다. 또한 2단계 사업 추진 동안 제품 개발 주체인 산업체에 모든 개발된 기술을 적용할 수 있는 기반 제공 및 상용화를 위한 성공적인 기술이전도 포함된다. 상용화 개발 완료 후인 Post Project 기간 동안에 발생할 수 있는 모든 지원체계의 구축도 장기간에 걸친 연구 개발의 연장선상에서 추진되어야 될 것으로 예상된다. 세부 추진내용으로 나노팹 공정현장의 고진공펌프 신뢰성평가의 기본 개념설계를 포함한 현장 데이터의 확보 및 분석 현황, 공정현장의 실제 환경에 투입하기 전 단계의 모든 신뢰성 확보 방안, 터보분자펌프의 경우 파괴실험을 포함한 over speed, shock venting, foreign debris dropping test 등 상용화 단계에 필요한 기본 시험평가 조건을 고찰하고자 한다. 상용화 단계의 내구성 및 신뢰성 확보를 위한 전제 조건은 대외적으로 공표할 수 있는 시험 평가 데이터와 개발 주체에서 기밀 수준으로 유지해야만 하는 민감한 자료의 상시 생산 infra의 구축으로 볼 수 있다. 이러한 고진공펌프개발이라는 과제의 대명제를 완성하기 위하여 추진 연구개발 방향 등 진행형인 2년간의 최종 상용화에 필요한 국제 신뢰성, 공정대응성 확보 등 핵심사업 추진내용 및 infra 구축의 상세개발 로드맵을 완성하고자 한다.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2010.06a
• /
• pp.301-301
• /
• 2010

현재 전 세계는 앞으로 사용 될 대체 에너지에 많은 관심 가지고 있다. 지금 사용하고 있는 에너지 연료는 한정되어 있기 때문에 대체에너지에 대한 연구가 활발히 진행 되고 있다. 그 중 압전체를 이용한 에너지 하베스팅은 많은 주목을 받고 있다. 주변 환경에서 필요한 에너지를 끌어 쓸 수 있는 대표적인 청정에너지 시스템 중 하나이기 때문이다. 최근 전원 공급원으로써 에너지 수확 시스템은 현 사회에 사용되고 있는 배터리로 전원을 사용하는 제품들을 소용량과 저전압 분야에서의 에너지 수확의 원리를 이용하여 전기전자제품의 사용시간 연장 및 응용분야 확대를 시도하는 연구가 활발히 수행되고 있다. 압전세라믹스를 이용한 에너지 하베스팅은 진동에너지를 전기에너지로 변환하는 것으로서 압전 특성이 높아야 한다. 일반적으로 압전 세라믹스는 PbO 성분이 들어가므로 환경적 오염 뿐만 아니라 인체에도 영향이 좋지 않으므로 많은 나라에서 이러한 성분을 제한하고 점차적으로 줄어들고 있는 시점에서 PbO를 사용하지 않고 Lead-Free 세라믹를 사용한 연구가 진행되고 있다. 이 논문에서는 일반적인 소결 방법을 이용하여 (Na,K)NbO3 세라믹에 CeO2를 첨가한 압전 세라믹을 제작하였다. 제작된 압전 세라믹스로 에너지 하베스팅 소자를 제작하고, 이 소자로 수확된 에너지로 DC-DC Converter 응용 특성에 대하서 연구하였다. 압전 세라믹스의 좋은 압전 특성을 출력하기 위하여 캔틸레버의 고유 진동수가 진동원의 주파수와 일치하는 공진을 일으켜야 한다. 따라서 구동회로는 주파수원을 찾아 설계하였고, 압전 세라믹스의 진동은 가진기를 이용하여 구동실험을 하였다. 지금까지 나와있던 에너지 하베스팅 회로와 비교하여 그 특성을 분석하고, 시뮬레이션 및 실험을 통하여 검증하였다.

• Proceedings of the Korean Vacuum Society Conference
• /
• 2013.08a
• /
• pp.112.2-112.2
• /
• 2013

지식경제부의 청정제조기반 산업원천개발사업의 일환으로 진행 중인 "초고진공펌프 개발" 과제 중 제 3세부 과제인 "고진공펌프종합특성평가시스템 설계, 진단기술 개발" 과제에서 5년 동안 진행되고 있는 전반적인 연구수행결과 및 구축 완료된 종합특성평가시스템을 활용한 고진공펌프의 상용화를 위한 신뢰성 평가에 관하여 소개한다. 고진공펌프개발 총괄 과제의 대명제는 "국제적 신뢰성을 가지는 상용화 제품의 완성"이며, 10(3) mbar~10(-10) mbar 영역의 국내 진공펌프 개발 수준의 선진화를 위한 모든 특성평가장치의 국제적 신뢰성이 있는 완벽한 성능평가의 구현을 포함한다고 볼 수 있으며, 전체 사업 추진기간 동안 제품 개발 주체인 산업체에 상용화를 위한 신뢰성 기반기술의 완벽한 구현의 제공에 있다고 할 수 있다. 이러한 고진공펌프의 신뢰성 평가는 저진공펌프의 신뢰성 평가기술에 기반을 두고 있으며, 기 개발 완료된 특성평가뿐만 아니라 실질적으로 나노종합팹센터의 공정현장에서 판단할 수 있는 내구성진단 및 최종 제품의 기계적 신뢰성 진단기술의 복합적인 요인들의 집합적인 분석에 기인하고 있다고 판단할 수 있다. 상용화 단계의 내구성 및 신뢰성 확보를 위한 전제 조건은 대외적으로 공표할 수 있는 시험평가 데이터와 개발 주체에서 기밀 수준으로 유지해야만 하는 민감한 자료의 상시 생산 infra의 구축으로 볼 수 있다. 이러한 진공펌프개발이라는 과제의 대명제를 완성하기 위한 연구개발 등 최종 상용화에 필요한 국제 신뢰성, 공정대응성 확보 기술개발 등 핵심사업 추진내용을 소개하고자 한다.

• Journal of the Korean Institute of Gas
• /
• v.28 no.1
• /
• pp.53-58
• /
• 2024

Due to the development of industry and improvement of living standards, the amount of natural gas used in the world is constantly increasing, and related industrial facilities such as power plants, storage facilities, and supply pipelines are constantly increasing. Natural gas is a convenient and clean fuel that does not pollute the environment, but in the event of an accident due to leakage, it can cause human casualties, large-scale property damage, and negative effects on the global warming effect. In addition to the severe penalties under the Severe Disaster Punishment Act, it is necessary to ensure safety. Therefore, by applying the principle of laser-based absorption spectroscopy, we developed a long-range portable methane leakage gas detection system that can detect the concentration of methane leaking from a distance of up to 30 meters and verified its effectiveness.

• Journal of Korea Society of Industrial Information Systems
• /
• v.27 no.3
• /
• pp.21-28
• /
• 2022

Fine dust enters the lungs or blood vessels through the respiratory tract through the air. Recently, due to the fine dust problem, the demand for air purifiers in Korea is also increasing rapidly. Moss is the oldest terrestrial plant, and it is known that it has the property of adsorbing and decomposing heavy metals and fine dust. To compare the effect of reducing fine dust between moss and the existing chemical filter (Hepa), a cube of 1 m³ was manufactured and the amount of fine dust reduction under a controlled environment was compared. Under the fine dust conditions, an umbrella moss filter, rat tail moss filter, feather moss filter, and silk moss filter were inserted for a total of 40 experiments, 10 times each in 4 different situations. The difference between the amount after 30 minutes was statistically significant for all filters. However, as a result of the test, it was confirmed that there was no statistically significant difference between filters for fine dust, mixed gas, CO₂, and O₂. In particular, it was confirmed that the previously claimed effect of oxygen generation was almost nonexistent. Through this result, it was confirmed that the reduction of fine dust is effective regardless of the species view of moss, and it is expected to replace or supplement the chemical filter of the existing air purifier through future improvement.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.20 no.6
• /
• pp.587-591
• /
• 2019

Fine dust aerated in the atomsphere penetrates our lungs and blood lines through respiratory. Recent fine dust problems in Korea leads to development of various air purifiers. The researchers used this to study systems that could replace chemical filters. In order to compare the effect of the reduction of moss and conventional chemical filter(Hepa), a 1 cubic meter cube was prepared and the amount of the concentration of fine dust reduction was compared under controlled environment. Under the high concentration of fine dust, a test was done to figure out the reduction rate of the fine dust concentration by using air purification system with moss, hepa, and no filter. The air purification system(moss, hepa, and no filter) were operated 90 times in total, 30 times each. The test explains that the reduction of the fine dust amount and the rate of fine dust concentration. The results illustrate that the reduction of the amount fine dust was 138.93 after using air purification system with moss filter. In contrast, the usage of air purification system with hepa filter reduced the amount of fine dust to 76.57. And the air purification with no filter shows that the slight reduction of fine dust amount at 0.10. In the rate of fine dust concentration, moss filter was significantly higher than that of hepa, no filter (0.2379, 0.1298 and 0.0063 each). The results have confirmed that moss is effective in reducing fine dust concentration, and it is expected that with further improvement it can be used as a means to replace or supplement existing chemical filters in air purifier.

• Clean Technology
• /
• v.29 no.1
• /
• pp.10-21
• /
• 2023

Hydrogels that are made of natural polymer-based double networks have excellent biocompatibility, low cytotoxicity, and high water content, assuring that the material has the properties required for a variety of biomedical applications. However, hydrogels also have limitations due to their relatively weak mechanical properties. In this study, hydrogels based on an alginate di-aldehyde (ADA) and gelatin (Gel) double network that is reinforced with additional hydrogen bonds formed between the hydroxyl (-OH) groups of the hyperbranched polymer (HPG) and the functional groups present inside of the hydrogels were successfully synthesized. The enhanced mechanical properties of these synthesized hydrogels were evaluated by varying the amount of HPG added during the hydrogel synthesis from 0 to 25%. In addition, magnetite nanoparticles (Fe₃O₄ NPs) were synthesized within the hydrogels and the structures and the magnetic properties of the hydrogels were also characterized. The hydrogels that contained 15% HPG and Fe₃O₄ NPs exhibited superparamagnetic behaviors with a saturation magnetization value of 3.8 emu g^-1. These particular hydrogels also had strengthened mechanical properties with a maximum compressive stress of 1.1 MPa at a strain of 67.4%. Magnetic hydrogels made with natural polymer-based double networks provide improved mechanical properties and have a significant potential for drug delivery and biomaterial application.

• Journal of Energy Engineering
• /
• v.21 no.2
• /
• pp.133-137
• /
• 2012

Among various clean energy technologies, the solar energy technology has been widely used in various fields such as photovoltaic power generation and solar water/space heating. These days, special attention is drawn on its conversion into acoustic energy along with waste heat as a means to promote clean energy utilization. This work was carried out to investigate the possibility of converting solar energy into acoustic waves, especially, its performance characteristics for a single resonance tube (20.2 mm in ID). Variations are made for the stack length and its position as well as power supply. For a resonance tube of 200mm, an average sound pressure of 114.5 dB was measured with a stack length of 25.6mm at 5cm from the closed end. When the power supply was increased to 35W, an average sound pressure of 117.29 dB was detected with a frequency of 500Hz. There was an increase in frequency, 630 Hz (115.7dB), with a shorter resonance tube of 150mm.

• Clean Technology
• /
• v.24 no.1
• /
• pp.9-14
• /
• 2018

In this study, Material life cycle evaluation was performed to analyze the environmental impact characteristics of TiN-Zr membrane manufacturing process. The software of MLCA was Gabi. Through this, environmental impact assessment was performed for each process. Transition metal nitrides have been researched extensively because of their properties. Among these, TiN has the most attention. TiN is a ceramic materials which possess the good combination of physical and chemical properties, such as high melting point, high hardness, and relatively low specific gravity, high wear resistance and high corrosion resistance. With these properties, TiN plays an important role in functional materials for application in separation hydrogen from fossil fuel. Precursor TiN was synthesized by sol-gel method and zirconium was coated by ball mill method. The metallurgical, physical and thermodynamic characteristics of the membranes were analyzed by using Scanning Electron Microscope (SEM), Energy Dispersive X-ray (EDS), X-ray Diffraction (XRD), Thermo Gravimetry/Differential Thermal Analysis (TG/DTA), Brunauer, Emmett, Teller (BET) and Gas Chromatograph System (GP). As a result of characterization and normalization, environmental impacts were 94% in MAETP (Marine Aquatic Ecotoxicity), 2% FAETP (Freshwater Aquatic Ecotoxicity), 2% HTP (Human Toxicity Potential). TiN fabrication process appears to have a direct or indirect impact on the human body. It is believed that the greatest impact that HTP can have on human is the carcinogenic properties. This shows that electricity use has a great influence on ecosystem impact. TiN-Zr was analyzed in Eco-Indicator '99 (EI99) and CML 2001 methodology.

• Journal of the Korea Organic Resources Recycling Association
• /
• v.18 no.2
• /
• pp.76-83
• /
• 2010

We(Hansol EME Co. Ltd.) proceeded anaerobic digestion test for domestic food wastewater applying to two operating method for increasing of OLR. The methods are as follows. One was the rapidity operating method which was increasing the OLR continuously and rapidly and the other was the terraced operating method which was increasing the OLR having adaptation period for each step. As a result of this tests, the ratio of VFA/Alkalinity of the process was very unstable under the rapidity operating method then the volume of produced biogas was dramatically decreased. However the process was shown stable performance under the terraced operating method maintaining the ratio of VFA/Alkalinity less than 0.4. Also, the process was performing the biogas recovery of $0.8Nm^3/kgVS_{rem}/d$ and the VS removal ratio of 85%. T-RFLP analysis about the community of bacteria and methanogen is also conducted to check the change of the microbial community according to the methods of OLR increasing operation. The microbial community was changed by the methods of OLR increasing operation according to the result of T-RFLP analysis. Although the anaerobic digestion test was executed by same pilot plant, the reactivity and the tolerance of microbial community for surrounding environment could be considerably changed by the operating method for the process.