• 문화기술의 융합
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• 제9권6호
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• pp.1001-1006
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• 2023

전 세계적인 에너지 비용 상승과 에너지 수요 증가는 공급망 전반에 걸쳐 상당한 양의 에너지를 소비하는 식품가공·제조업에 있어 중요한 문제이다. 이에 에너지 사용을 최적화할 수 있는 실시간 에너지 모니터링 및 분석 시스템의 개발이 필요하다. 본 연구에서는 식품공장에 설치된 IoT를 기반으로 각 설비별 모니터링과 열처리 공정에 관한 에너지 공급·사용량 모니터링, 검색 기능이 포함된 식품 공장 에너지 모니터링 시스템이 제안되었다. 본 시스템은 식품가공공장의 IoT 센서를 기반으로 PLC, 데이터베이스 서버, OPC-UA서버, UI 서버 및 API 서버와 CIMON 사의 HMI 등으로 구성된다. 시스템은 식품공장의 빅데이터 구축과 함께 수집 기능을 통한 설비별 모니터링과 열처리 공정에 관한 에너지 공급·사용량 모니터링 및 검색 서비스 기능을 제공한다. 본 데이터 수집 기반 에너지 모니터링 시스템은 에너지 절감을 위한 중소기업형 공장 에너지 모니터링·관리 시스템 개발을 위한 가이던스 역할이 될 것이다. 향후, 본 시스템을 활용하여 에너지 사용량 파악 및 분석을 통한 공정 작업이 최적화된 정량적인 에너지 절감 방안이 마련될 수 있다.

• 멤브레인
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• 제29권6호
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• pp.323-328
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• 2019

인류의 에너지 수급은 항상 인간의 삶에 중요한 문제이며, 최근에는 전기 생산 및 공급 문제로 이어지고 있다. 이에 관련하여 본 연구에서는 에너지 저장장치의 일환으로 슈퍼커패시터 용도의 고체 전해질막을 제조하였다. 제조한 전해질막은 poly(vinyl alcohol) (PVA) 주사슬에 poly(oxyethylene methacrylate) (POEM) 곁사슬을 그래프팅하여 사용하였으며, 그래프팅은 자유 라디칼 중합법을 통해 합성하였다. 본 연구에서 사용한 PVA-g-POEM 가지형 공중합체를 슈퍼커패시터 전해질에 적용한 사례는 처음이다. POEM 그래프팅을 통해 PVA가 고유하게 가지고 있던 구조가 변화하였으며, 이를 FT-IR을 통해 분석하였다. 또한, 합성한 공중합체를 이용한 슈퍼커패시터 성능은 cyclic voltammetry (CV), galvanostatic charge/discharge(GCD), ragone plot 등을 통해 분석하였다. 이를 통해 기존에 수계 전해질로 PVA 단일 고분자만 사용하던 분야에 그래프팅 방법이라는 새로운 접근법을 제시하였다.

• 한국대기환경학회지
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• 제15권4호
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• pp.475-483
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• 1999

A lab-scale test was carried out to study the reduction of electrical energy consumption in the pulsed corona discharge process for nitrogen oxides removal. The experiment was mainly focused on 1) the activation of pollution removal reactions by chemical additives and 2) the optimization of electrical circuit for the efficient energy transfer from the power supply to the corona reactor. Hydrocarbon chemical additives used in the experiment are thought to be responsible for the enhancement of the NO conversion through the chain reactions of free radicals such as, R, RCO, and RO. Electrical energy consumption per converted NO molecule has a minimum value of 17 eV when pentanol is injected. When ethylene and propylene are injected, 30 eV and 22 eV of electrical energy consumption is required for the conversion of NO molecule respectively. The ratio of the pulse forming capacitance$(C_e)$ to the reactor capacitance$(C_R)$ plays an important role in the energy transfer efficiency to the reactor. Maximum energy transfer efficiency of approximately 72% could be obtained by using the pulse forming capacitance which is 3.4 times larger than the reactor capacitance, and also the maximum NO conversion efficiency was observed with the same condition.

• 유통과학연구
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• 제20권7호
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• pp.57-64
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• 2022

Purpose: The government of India has initiated the Covid-19 Vaccination drive from early January 2021. Vaccination is identified to be best option to protect the people across the globe. However, owing to fast wide spread of the Covid-19, the Vaccine Distribution is a major challenge owing various issues like temperature control, infrastructure, hesitancy, geographical diversity, and other critical factors. Various research is carried out globally to understand and study the Vaccine Distribution issues based on the respective country issues and factors. Research Design, Data, and Methodology: This research paper attempts to explore prominent factors that could be taken up on priority for better and effective vaccination program. The study tries to rank various factors and sub-factors affecting vaccine distribution in India. AHP methodology based on feedback from 22 experts from the Vaccine industry has been deployed to get the desired results. Result: The results show that factors vaccine approval process, geographical prioritization, power supply, infrastructure maintenance costs for vaccine storage, and vaccine pricing are the prominent factors of effective vaccination in the country. Conclusion: The role and need for district-level health officers towards vaccine storage has been brought forward. A long-term effective vaccination policy is needed for optimum vaccine distribution.

• 한국수소및신에너지학회논문집
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• 제33권6호
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• pp.607-615
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• 2022

In this study, economic analysis program was developed for economic evaluation of hydrogen production, storage/delivery, and utilization technologies as well as overseas import of hydrogen. Economic analysis program can be used for the estimation of the levelized cost of hydrogen for hydrogen supply chain technologies. This program include five hydrogen production technology on steam methane reforming and water electrolysis, two hydrogen storage technologies (high compressed gas and liquid hydrogen storage), three hydrogen delivery technologies (compressed gas delivery using tube trailer, liquid hydrogen, and pipeline transportation) and six hydrogen utilization technologies on hydrogen refueling station and stationary fuel cell system. In the case of overseas import hydrogen, it was considered to be imported from five countries (Austraila, Chile, India, Morocco, and UAE), and the transportation methods was based on liquid hydrogen, ammonia, and liquid organic hydrogen carrier. Economic analysis program that was developed in this study can be expected to utilize for planning a detailed implementation methods and hydrogen supply strategies for the hydrogen economy road map of government.

• 한국전자통신학회논문지
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• 제16권6호
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• pp.1183-1194
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• 2021

전통적으로 전력시스템은 공급체계의 말단에 있는 소비자의 위치에서 보면 중앙집중화된 구조를 갖고 있다. 그러나 최근 수 십년간 지붕형 태양광, 영농형 태양광, 소형 풍력터빈, 배터리저장장치 및 스마트 가전품과 같은 분산에너지원의 등장을 보아왔다. 분산에너지원의 등장에 따라 배전계통 운전원의 역할도 확장된다. 확장된 분산전원의 진출은 배전망이나 송전망의 전통적인 계획과 운영에 영향을 주는 전력계통의 역조류와 예측성을 어렵게 할 수 있다. 이는 전형적인 계통계획, 정비 및 망관리, 정전할당 등 배전계통 운전원이 갖는 기능이 변경되어야 할 필요성을 증폭시킨다. 이 연구의 목적은 다중 분산전원을 갖는 미래 배전운전시스템을 설계하고 제안된 배전시스템 모델을 HILS로 구현 및 검증하는 것이다. 시험결과를 보면 제안된 배전시스템이 정상 영역에서 운전되고 배전선로 손실이 감소된다는 것을 보여준다.

• 토지주택연구
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• 제9권2호
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• pp.41-50
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• 2018

The purpose of this study is to review the U.S. renewable energy policies implemented by the federal government and the state governments to investigate potential barriers of renewable energy expansion and to develop policy implications for the successful renewable energy policy making in Korea. Recently, the restructuring in the energy supply chain has been being a new trend in many countries that shows a transition from traditional fossil fuels to sustainable renewable energy sources. The United States has enforced effective renewable energy policies (i.e., regulatory policies, financial incentives), which have led to the exploding growth of renewable energy facilities and productions over the last ten years. For example, many state governments in the U.S. are implementing Renewable Portfolio Standard (RPS) policies that require increased energy supply from renewable energy sources (i.e., solar, wind and geothermal). These RPS policies are expected to account for at least 10-50 percent of total electricity production in the next fifteen years. As part of results, in the recent three years, renewable energy in the U.S provided over 50 percent of total new power generation constructions. On the other hand, Korea initiated to develop climate change policies in 2008 for the Green Growth Policy that set up a target reduction of national Greenhouse Gas (GHG) emissions up to 37 percent by 2025. However, statistical data for accumulated renewable energy capacity refer that Korea is still in its early stage that contribute to only 7 percent of the total electricity production capacity and of which hydroelectric power occupied most of the production. Thus, new administration in Korea announced a new renewable energy policy (Renewable Energy 3020 Plan) in 2017 that will require over 95 percent of the total new generations as renewable energy facilities to achieve up to 20 percent of the total electricity production from renewable energy sources by 2030. However, to date, there have not been enough studies to figure out the barriers of the current policy environment and to develop implications about renewable energy policies to support the government plan in Korea. Therefore, this study reviewed the U.S. renewable energy policies compared with Korean policies that could show model cases to introduce related policies and to develop improved incentives to rapidly spread out renewable energy facilities in Korea.

• 자원환경지질
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• 제55권4호
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• pp.399-406
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• 2022

2050 탄소중립이라는 메가트렌드에 맞추어 청정에너지기술에 사용되는 핵심광물의 양이 파리기후변화협약기반 시나리오와 2050 탄소중립기반 시나리오에 따르면 각각 4배, 6배 증가하는 것으로 평가된다. 그리고, 한국의 경우, 2차전지에 사용되는 배터리 공급망에서 볼 때 배터리물질과 배터리셀팩을 제조하는 미드스트림에서는 강점을 보이나 원료물질을 제공하고 처리하는 업스트림에서는 어려움을 겪고 있다. 한국지질자원연구원은 이러한 배터리원료광종의 업트스림 리스크에 대응하기 위해 리튬, 니켈, 코발트에 대한 확보전략을 수립하고 탐사기술을 개발하고 있다. 리튬의 경우, 경상북도 울진에서 2020년부터 탐사를 진행하고 있고 2021년말 제반탐사자료를 종합하고 3D모델을 구축하여 정밀탐사대상지를 선정했으며, 2022년에는 정밀탐사대상지를 중심으로 리튬페그마타이트의 부존잠재량을 평가할 예정이다. 니켈의 경우, 과거 탐광을 했던 10여개 니켈황화물광상을 대상으로 예비조사를 통하여 2022년말 탐사대상지를 선정할 예정이다. 코발트의 경우, 남한에서는 유일하게 보국코발트가 알려져있지만 열수광상으로 코발타이트가 산출되었다는 기록만 있을뿐 세계적인 코발트광상(예. 모로코 Bou Azzer)의 성인을 보면, 초염기성암과 관련된 사문암체와 화강암의 접촉부에서 코발트광체가 발견되어 국내에서는 코발트탐사를 위한 프로토콜을 정립할 예정이다.

• JSTS:Journal of Semiconductor Technology and Science
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• 제10권1호
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• pp.1-10
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• 2010

This paper proposes a two-phase clocked adiabatic static CMOS logic (2PASCL) circuit that utilizes the principles of adiabatic switching and energy recovery. The low-power 2PASCL circuit uses two complementary split-level sinusoidal power supply clocks whose height is equal to $V_{dd}$. It can be directly derived from static CMOS circuits. By removing the diode from the charging path, higher output amplitude is achieved and the power consumption of the diode is eliminated. 2PASCL has switching activity that is lower than dynamic logic. We also design and simulate NOT, NAND, NOR, and XOR logic gates on the basis of the 2PASCL topology. From the simulation results, we find that 2PASCL 4-inverter chain logic can save up to 79% of dissipated energy as compared to that with a static CMOS logic at transition frequencies of 1 to 100 MHz. The results indicate that 2PASCL technology can be advantageously applied to low power digital devices operated at low frequencies, such as radio-frequency identifications (RFIDs), smart cards, and sensors.

• Asian Journal of Innovation and Policy
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• 제11권2호
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• pp.222-237
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• 2022

As the COVID-19 pandemic crisis left developing countries with economic setbacks, it is high time to highlight that innovative technologies lead the digital economy. The big powers including the United States and China are already implementing industrial policies that involve large-scale fiscal expenditures to secure the lives and safety of their people. To prepare for the future up to 2025, this paper reflects opinions of industry-academia-research experts regarding changes in the external environment and industry trends. By reflecting results of focus group interviews and changes in the external environment and industry trends, a new high-level 5X strategy (Digital Transformation, Energy Transformation, Bio Health Transformation, Supply Chain Transformation, and Research Transformation) to solve national tasks required for the existing ten policy demand fields and ten agenda during lower-level policy implementation stages were derived.