• 자원리싸이클링
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• 제29권2호
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• pp.3-7
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• 2020

최근 저품위 (폐)광석으로부터의 금 회수를 위한 침출기술이 각광을 받고 있다. 현재 침출기술은 경제성과 효율성 측면에서 시안을 이용하는 것이 효과적이나 시안은 독극물의 일종으로 환경오염의 우려가 있어 규제 및 관리가 요구된다. 특히 이러한 문제는 최근 주목받고 있는 저비용 침출기술인 Dump 혹은 Heap leaching 적용시 더욱 현저하다. 이를 해결하기 위해 티오황산염(thiosulfate) 이나 할로겐화합물 등 시안을 대체할 대안침출제의 개발이 활발하게 진행되고 있으나 이들은 아직 상용화에 이르기까지 여러 어려움이 있으며 추가적인 연구개발이 필요하다. 저비용 친환경적인 생물학적 금침출도 상용화되고 있으나 이는 대부분 직접 금 침출이 아닌 시안침출의 전처리 산화공정(pre-oxidation process)으로 적용되고 있다. 그러나 생물학적 침출을 통한 직접 금 회수도 이론적으로 가능하며 향후 Dump나 heap bioleaching을 통한 직접 금 침출로 시안이 필요없는 저품위 금 회수 상용화가 시급하다고 판단된다.

• 한국태양에너지학회 논문집
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• 제30권6호
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• pp.118-124
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• 2010

In order to develop commercial model of 10kW dish-Stirling solar thermal power system, modification for the exiting facility was taken for a year as a Leading Project in KIER. During the project, solar tracking system, control and monitoring system and high durability reflector were developed and long term operation were performed. The solar tracking system was tested for four months to investigate the degree of precision and adapted to the control system for an actual operation from October in 2009. The sun tracking accuracy of ${\pm}4$ mrad using modified control system was obtained and the system operated successfully during the experimental period. The monitoring system displays engine pressure, electric generation amounts, generator RPM, receiver temperatures, and etc. from Stirling engine and weather data of Direct Normal Irradiation, Horizontal Global Insolation, wind speed & direction, and atmosphere temperature from weather station. According to the operating results in a clear sky day, electric power of 6,890 W was generated at the DNI value of 850 W/$m^2$ and the averaged solar-to-electricity efficiency during a whole day reached to 18.99%. From the overall operating results, linear power generation trend could be observed with increasing DNI value. The solar-to-electricity efficiency achieved to 19% around the DNI value of 700 W/$m^2$ and increased to 20% when the DNI value goes up to 900 W/$m^2$.

• 한국산업정보학회논문지
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• 제29권4호
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• pp.55-66
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• 2024

HVDC (high-voltage direct current) 시스템에 TP (thermoplastic) 케이블을 안전하게 사용하기 위해서는 다양한 연구와 테스트를 통해 운전 중 발생할 수 있는 시스템 고장으로 인한 케이블의 수명 손실률 분석이 필요하다. 본 논문에서는 HVDC 시스템 운영 중에 발생할 수 있는 고장 유형에 따른 TP 케이블의 절연체 수명 손실률을 분석하였다. TP 케이블 모델에 고장으로 인한 전력을 인가하고, 2D 유한요소법을 통한 분석 결과를 바탕으로 Arrhenius-IPM (Inverse Power Model)을 적용하여 절연체의 수명 손실률을 분석하였다. 분석결과 절연체 수명 손실률은 전기장 세기의 영향이 높았으며, 고장 발생 시 절연체 내부 측에서 손실률이 가장 높았다. 이러한 결과는 TP 케이블 상용화를 위한 초기 설계 단계에서 중요한 특성으로 사용될 수 있다.

• Journal of Forest and Environmental Science
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• 제25권2호
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• pp.131-138
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• 2009

Recently, various efforts for the extended utilization of woody biomass has been attempted due to the fact that global warming, energy and environmental problems are urgent ones to be solved. Development of new energy sources at our national security level is desperately needed as we depend on almost all of energies supplied from other countries, let alone the economic crisis caused by oil price hike. Woody biomass can be converted to energy by means of thermochemical, biological, or direct combustion processes. Many processes are available for producing bioenergy, such as bioethanol, wood pellet, wood chip, combined heat, and power system. Political support and R&D investment should be provided that can boost the utilization of the wood biomass, the eco-environment, and recyclable and alternative energy resources for national power security. In addition, a long-term strategy that can utilize unused and low efficient woody biomass resources, and systematically collect and manage them in a national level should be set up. Even though the possibility in total exchange of fossil oil with woody biomass is quite low, technology developments of woody biomass for the solution to global warming and environmental problem through its commercialization are expected to grow steadily.

• 디지털융복합연구
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• 제10권6호
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• pp.17-22
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• 2012

IT산업 기업 간의 치열한 경쟁 환경에서 기업 생존을 위한 기술혁신은 경쟁력 확보를 위한 필수요소가 되고 있다. 이러한 기술혁신은 기업의 생존을 위해 반드시 필요하며 다양한 요인들이 기술혁신의 성공을 거두기 위해 필수적으로 고려되어야 한다. 본 논문에서는 정부의 지원 수준이 기술혁신의 성패에 어떠한 영향을 미치는지를 로지스틱 회귀분석을 통해 살펴보았다. 결론적으로 정부지원 측면에서 IT제조업의 제품혁신 성공을 위해서는 직접적인 기술개발 및 사업화 지원을 위한 자금 지원이 필요하며, 공정혁신을 위해서는 기술인력 지원이나 교육연구 지원 등이 성공여부에 영향을 미치는 것으로 분석되었다.

• 산경연구논집
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• 제11권10호
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• pp.7-16
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• 2020

Purpose: It suggests that making a policy and strategies in a way of AI and its impact of commercialization on economic efficiency, social custom ethics. Research design, data, and methodology: The paper has analyzed the data based on the proposed model when derived as AI vs. FI job, etc. It is very different for each professional evaluation, which is artificial intelligence or robot job. One concept case was selected as a substitute job, with a relatively low level of occupation ability, such as direct labors, easily replaced. By the induction data has resulted in modeling. Results: The paper suggests that AI at high level become something how to make real decisions on ethical value modeling. Through physical simulation with the deduction data, it can be tuned to design and control what has not been solved, from human senses to climate. Conclusion: For the exploiting of new AI decision-making jobs in markets, the deduction data is possible to prove to AI's Decision-making that the percentage who can easily have different leadership as is different for each person. what is generated by some information silos may be applied to occupation societies. The empirical results indicate the deduction data that if AI determines ethical decisions (VC) for that modifications, it may replace future jobs.

• 한국분무공학회지
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• 제14권4호
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• pp.153-162
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• 2009

The use of inedible vegetable oils as substitute for diesel fuel in compression ignition engine is of significance because of the great need for edible oil as food, and the reduction of biodiesel production cost etc. Jatropha curcas oil which is a leading candidate for the commercialization of inedible vegetable oils is selected in this study for reviewing the application in CI engine as an alternative fuel. The important properties of jatropha oil (JO) and JO biodiesel are summarized from the various sources in the literature. It is found that five different types of alternative fuel from JO such as neat JO, JO blends with diesel or other fuel, neat JO biodiesel, JO biodiesel blends with diesel or other fuel and degummed JO were extensively examined in the diesel engine. Two different application types of alternative fuels from JO such as preheating and dual fuelling were also tested, It should be pointed out that most of these applications are limited to single cylinder conditions. The systematic study for the selection of effective application method is required. It is clear that the blends of JOME and diesel can replace diesel fuel up to 10% by volume for running the existing common rail direct injection systems without any durability problems. The systematic assessment of spray characteristics of different types of JO and its derivatives for use as diesel engine fuel is also required.

• Journal of information and communication convergence engineering
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• 제9권4호
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• pp.452-456
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• 2011

Context-awareness system can provide an optimized services to users. Analyzing physical and complex circumstance elements which give direct or indirect influence to users can tell what users want. However, there are various situation informations around users and it requires high level technology to extract the service what users really want among those informations. The circumstance of the user can be changed from moment to moment, even the service what users want also can be changed in every minutes. Recently the researches to provide the service which a user demands has been progressed actively. Web based filtering method which reaches commercialization is a one of good examples. This method extracts necessary data according to users' demands from the documents on the Web or multimedia informations. However, there is a limit to use it to provide Context-awareness service because it extracts static data, not dynamic data. There is also other researches with a rule based filtering method in progress to filter situation information but this method doesn't have mechanism for dynamic data as well. We would like to solve these problems by providing a dynamic situation information filtering mechanism applying an weighted value about each property of objects and also applying Web based dynamic categories in this paper when unnecessary data should be filtered.

• 공업화학
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• 제27권2호
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• pp.128-134
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• 2016

최근 셰일가스의 개발로 프로판, 부탄과 같은 경질알칸으로부터 프로필렌, 부텐, 부타디엔과 같은 올레핀을 제조하는 탈수소 공정에 대한 연구와 상용화가 많이 진행되었다. 특히 직접 탈수소화 반응의 열역학적 한계를 극복하고자 산화적 탈수소 또는 선택적 수소 산화 반응과 같이 산소를 활용한 기술의 연구개발이 진행되거나, 실제 공정에 적용된 사례들도 보고되고 있다. 이에 본 연구에서는 경질알칸의 탈수소 반응을 위한 산소활용기술의 최근 연구동향을 가스상의 산소를 활용하는 방법과 고체산화물의 격자산소를 활용한 기술로 나누어 정리하고, 산소활용기술의 현황과 연구 개발 방향 및 향후 전망에 대해 고찰하였다. 반응물의 반응성에 따라 기체상 산소의 적용이 용이한 경우와 반응성의 조절을 위해 격자산소를 이용하는 기술로 분류할 수 있었고, 전환율을 높이면서 선택도를 낮추지 않는 기술의 개발이 주요한 목표가 되었다.

• Current Photovoltaic Research
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• 제11권1호
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• pp.18-26
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• 2023

Tin perovskite solar cells have attracted a lot of attention due to their potential to address the toxicity of lead, which is the biggest barrier to commercialization of perovskite solar cells. Unlike other lead-free perovskite, tin perovskite have a direct bandgap, which is suitable for use as light harvesting, and relatively good stability, which has led to a lot of attention. Since the first tin perovskite solar cell was reported in 2014, it has achieved an impressive power conversion efficiency of 14.81%. However, this efficiency is still low compared to that of lead perovskite solar cells, and the stability of tin perovskite solar cells is also an issue that needs to be addressed. In this review, we will discuss the basic properties of the tin atom in comparison to the lead atom, and then discuss the crystal structure, phase transition, and basic properties of tin perovskite. We will then discuss the advantages, applications, challenges, and strategies of tin perovskite, In particular, we will focus on how to prevent the oxidation of tin, which is arguably the biggest challenge for using tin perovskite solar cells. At the end, we summarize the key factors that need to be addressed for higher efficiency and stability, emphasizing what is needed to commercialize tin perovskite solar cells.