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Terahertz time domain spectroscopy of GdBCO superconducting thin films
Ji, Gangseon,Park, Woongkyu,Lee, Hyoung-Taek,Song, Chang-Yun,Seo, Choongwon,Park, Minjo,Kang, Byeongwon,Kim, Kyungwan,Kim, Dai-Sik,Park, Hyeong-Ryeol The Korea Institute of Applied Superconductivity a 2019 한국초전도저온공학회논문지 Vol.21 No.1
We present terahertz optical properties of $GdBa_2Cu_3O_{7-x}$ (GdBCO) superconducting thin films. GdBCO films with a thickness of about 105 nm were grown on a $LaAlO_3$ (LAO) single crystal substrate using a conventional pulsed laser deposition (PLD) technique. Using an Ar ion milling system, the thickness of the GdBCO film was reduced to 58 nm, and its surface was also smoothened. Terahertz (THz) transmission spectra through two different GdBCO films are measured over the range between 0.2 and 1.5 THz using THz time domain spectroscopy. Interestingly, the THz transmission of the thinner GdBCO film has been increased to six times larger than that of the thicker one, while the thinner film is still maintaining its superconducting property at below 90 K.
고신뢰 사이버-물리 무기체계 획득을 위한 LVC 연동 개발 프레임워크
강성주(Sungjoo Kang),김민조(Minjo Kim),박정민(Jungmin Park),전인걸(Ingeol Chun),김원태(Wontae Kim) 한국통신학회 2013 韓國通信學會論文誌 Vol.38 No.12(융합기술)
본 논문에서는 사이버-물리 시스템의 모델링 및 시뮬레이션 도구인 EcoSuite를 기반으로 지능화, 복잡화되고 있는 사이버-물리 시스템 형태의 무기체계를 개발 및 시험하는 프레임워크를 제시한다. EcoPOD를 이용한 무기체계의 모델링과 타 무기체계 모델들과 연동하여 구성 (Constructive) 시뮬레이션 환경 기반의 전장을 제공하는 EcoSIM이 소개된다. LVC 연동 개발을 위해서는 시뮬레이션 모델 연동 구조와 연동 기술에 순응(compliant)하는 인터페이스 기술, 그리고 시뮬레이션 모델과 실제 시스템(Live), 그리고 사용자와 상호작용하는 시스템(Virtual)의 연계 기술의 개발이 필요하다. 본 논문에서는 LVC 연동 개발을 통한 모델의 검증 및 시스템의 기능을 시험하는 아키텍처와 적용 사례가 제시된다. In this paper, we present a development framework for acquiring intelligent but complex cyber-physical weapon systems based on modeling and simulation development tools for cyber-physical systems, EcoSUITE. We introduce EcoPOD that models weapon systems and EcoSIM that provides constructive simulation environment for interoperating the weapon model to be developed with other weapon models. To develop cyber-physical weapon system based on LVC interoperation, an interoperation architecture and an interface technique for a live and a virtual system that is compliant with the interoperation architecture. By expanding EcoSuite, we provide LVC-based development framework for interoperating a real system, a human-interactive interface system, and simulation models and validate it with a case study.
Terahertz time domain spectroscopy of GdBCO superconducting thin films
박형렬,Gangseon Ji,Woongkyu Park,이형택,Chang-Yun Song,서충원,Minjo Park,Byeongwon Kang,Kyungwan Kim,김대식 한국초전도.저온공학회 2019 한국초전도저온공학회논문지 Vol.21 No.1
We present terahertz optical properties of GdBa2Cu3O7-x (GdBCO) superconducting thin films. GdBCO films with a thickness of about 105 nm were grown on a LaAlO3 (LAO) single crystal substrate using a conventional pulsed laser deposition (PLD) technique. Using an Ar ion milling system, the thickness of the GdBCO film was reduced to 58 nm, and its surface was also smoothened. Terahertz (THz) transmission spectra through two different GdBCO films are measured over the range between 0.2 and 1.5 THz using THz time domain spectroscopy. Interestingly, the THz transmission of the thinner GdBCO film has been increased to six times larger than that of the thicker one, while the thinner film is still maintaining its superconducting property at below 90 K.
Age-Dependent Sensitivity to the Neurotoxic Environmental Metabolite, 1,2-Diacetylbenzene
( Ngoc Minh Hong Hoang ),( Sungjin Kim ),( Hai Duc Nguyen ),( Minjo Kim ),( Jin Kim ),( Byoung-chul Kim ),( Daeui Park ),( Sujun Lee ),( Byung Pal Yu ),( Hae Young Chung ),( Min-sun Kim ) 한국응용약물학회 2021 Biomolecules & Therapeutics(구 응용약물학회지) Vol.29 No.4
1,2-Diacetylbenzene (DAB) is a metabolite of 1,2-diethylbenzene, which is commonly used in the manufacture of plastics and gasoline. We examined the neurotoxic effects of DAB in young and old rats, particularly its effects on hippocampus. Previously, we reported DAB impairs hippocampal neurogenesis but that the underlying mechanism remained unclear. In this study, we evaluate the toxicities exhibited by DAB in the hippocampi of 6-month-old (young) and 20-month-old (old) male SD rats by treating animals intraperitoneally with DAB at 3 mg/kg/day for 1 week. Hippocampal areas were dissected from brains and RNA was extracted and subjected to RNA-seq analysis. RNA results showed animals exhibited age-dependent sensitivity to the neurotoxic effects of DAB. We observed that inflammatory pathways were up-regulated in old rats but that metabolism- and detoxification-related pathways were up-regulated in young rats. This result in old rats, especially upregulation of the TREM1 signaling pathway (an inflammatory response involved in Alzheimer’s disease (AD)) was confirmed by RT-PCR. Our study results provide a better understanding of age-dependent responses to DAB and new insight into the association between DAB and AD.