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이의수,문기원,이일민,박동우,최다혜,신준환,김현수,박정우,박경현,Lee, E.S.,Moon, K.,Lee, I.M.,Park, D.W.,Choi, D.H.,Shin, J.H.,Kim, H.S.,Choi, D.H.,Park, K.H. 한국전자통신연구원 2018 전자통신동향분석 Vol.33 No.3
Terahertz (THz) imaging and spectroscopy have been developed as non-destructive testing methods for various industrial applications. However, they have not been widely adopted in real applications owing to a high system price and the large size of conventional THz time-domain spectroscopy systems, which are based on ultrashort optical pulse lasers. Recently, various types of compact THz emitters and detectors have become available. As a result, THz non-destructive test (NDT) systems have become viable solutions. Herein, we briefly review the recent advances in THz NDT techniques adopting continuous-wave THz systems, including our recent results of a THz-based waterproof test system and an electrical connection inspection system for car manufacturing.
Effects of microclimate temperature during transportation of broiler chicken on thigh meat quality
E.S. Lee(이의수),C.H. Kim,S.J. Ju,S. Dadgar,P.J. Shand 한국가금학회 2009 한국가금학회 정기총회 및 학술발표회 Vol.26 No.-
본 연구는 도축전 수송과정중 수송차량 내부의 미세환경온도가 육계 다리육의 육질에 미치는 영향을 조사하기 위하여 실시되었다. 3회의 육계 수송과정에서 총 264수에 대하여 수송중 육계 주변온도를 측정하였으며, 이 온도를 토대로 4개군(<0℃, 0-10℃, 10-20℃, >20℃)으로 시료를 분류한 후 육질을 평가하였다. 전체적으로 0℃이하 군에서 높은 pH와 a<SUP>*</SUP>값을 나타냈으며, 낮은 L<SUP>*</SUP>값과 b<SUP>*</SUP>값 및 낮은 가열감량을 나타내었다. 본 연구의 결과는 도축전 수송과정중 육계 주위의 온도가 육색, 최종pH, 가열감량 등 최종 육질의 변화에 영향을 미칠 수 있다는 것을 나타내었다. This study investigated the effect of microclimate temperature during pre-slaughter transportation during winter season on thigh meat quality of broiler chickens. A total of 264 birds were monitored individually during 3-4 h of transport in an actively ventilated trailer. Birds were classified into four temperature groupings, <0℃, 0-10℃, 10-20℃ and >20℃, based on their immediate surrounding temperature. Meat quality was assessed on chicken carcass by measuring pH, Minolta color, drip loss, thaw loss, cooking loss, and Allo-Kramer(AK) shear value of the illiotibialis muscle. Transportation of birds at temperatures below freezing resulted in thigh meat with significantly (p<0.05) higher ultimate pH and a<SUP>*</SUP> value. Furthermore, lower L<SUP>*</SUP>, b<SUP>*</SUP>, thaw loss, and cooking loss values were observed for thigh meat of birds exposed to temperatures below 0℃.
김현수,이의수,박동우,이일민,문기원,최다혜,신준환,김무건,최경선,박경현,Kim, H.S.,Lee, E.S.,Park, D.W.,Lee, I.M.,Moon, K.,Choi, D.H.,Shin, J.H.,Kim, M.G.,Choi, K.S.,Park, K.H. 한국전자통신연구원 2019 전자통신동향분석 Vol.34 No.3
The bandwidth of wireless communication is expected to grow exponentially due to the expansion of mobile devices and the increase of real-time and realistic multimedia services. Recently, the studies on terahertz band wireless communication have been actively conducted for the next generation communication after 5G wireless communication. The terahertz band, which is the unallocated frequency band, has been applied to the non-contact, non-destructive quality inspection industry such as the terahertz imaging and spectral systems through the development of terahertz generating and detecting components. This article briefly describes recent research trends on terahertz wireless communication technologies and introduces the details of photonics-based terahertz devices and systems that have been focused on the Terahertz Basic Research Section of Electronics and Telecommunication Research Institute.
문기원,이의수,이일민,박동우,김현수,박정우,한상필,박경현,Moon, K.,Lee, E.S.,Lee, I.M.,Park, D.W.,Kim, H.S.,Park, J.W.,Han, S.P.,Park, K.H. 한국전자통신연구원 2017 전자통신동향분석 Vol.32 No.3
오랫동안 미개척 주파수 대역이었던 테라헤르츠 대역은 소자 및 시스템 기술 연구성과의 축적과 기술 성숙 과정을 거쳐, 최근 다수의 상용화 시스템이 출시되는 등 산업 분야에의 응용이 확산되었다. 특히, 투과 이미징이 가능한 테라헤르츠 이미징 시스템은 산업 분야에서 비접촉 비파괴 품질검사 분야 등에 많은 응용이 기대되고 있다. 이밖에 분광 기술에 기반을 둔 막 두께 측정 시스템, 초고속 통신 시스템 등도 향후 중요한 테라헤르츠 기술 응용 분야로 여겨지고 있다. 본고에서는 테라헤르츠 응용 기술에 관한 최근의 연구 동향을 간략히 살펴보고, 한국전자통신연구원 전파위성연구본부 테라헤르츠 창의원천연구실에서 주력해 온 포토닉스 기반 테라헤르츠 소자 및 시스템에 관해 상세히 소개한다.
김무건,이의수,박동우,최다혜,이일민,신준환,김영호,김정수,조진철,김영훈,곽동용,박경현,Kim, M.G.,Lee, E.S.,Park, D.W.,Choi, D.H.,Lee, I.M.,Shin, J.H.,Kim, Y.H.,Kim, J.S.,Cho, J.C.,Kim, Y.H.,Kwak, D.Y.,Park, K.H. 한국전자통신연구원 2021 전자통신동향분석 Vol.36 No.3
The terahertz wave (THz wave) is a band between infrared and microwaves and is defined as an electromagnetic wave having a frequency of 0.1 to 10 THz band. THz waves have the property of transmitting nonpolar materials, which the visible light cannot be transmitted, such as ceramics, plastics, and paper; and the photon energy is low, such as several meV. For this reason, non-destructive testing equipment based on THz imaging technology can be applied to the industrial field. Recently, THz imaging technology was applied in wide industrial fields, such as automobiles, batteries, food, medical, and security, and being actively studied. In this paper, we describe the research trends of terahertz imaging technology and experimental results. Furthermore, we summarize the recent commercialized terahertz camera. Finally, we present the research results in the field of the human security scanner system.
테라헤르츠파 기반 대인 보안검색 기술의 동향과 발전 전망
이일민,이의수,김무건,최다혜,박동우,신준환,김영호,김정수,조진철,김영훈,조성우,곽동용,박경현,Lee, I.M.,Lee, E.S.,Kim, M.G.,Choi, D.H.,Park, D.W.,Shin, J.H.,Kim, Y.H.,Kim, J.S.,Cho, J.C.,Kim, Y.H.,Jo, S.,Kwak, D.Y.,Park, K.H. 한국전자통신연구원 2022 전자통신동향분석 Vol.37 No.2
Terahertz electromagnetic waves are considered the waves for the next generation of security checking technology. They can penetrate opaque materials, such as plastics, fibers, papers, and leathers. In addition, they are harmless to humans they cannot penetrate human skins. Moreover, because their frequencies are higher than those of millimeter waves, higher resolution and more detailed information is expected than the millimeter wave-based technologies In this study, we describe the trends and prospectives of terahertz technology as security checking technology that can be directly applied to a human body.
최다혜,신준환,이의수,문기원,이일민,박동우,김현수,김무건,최경선,박경현,Choi, D.H.,Shin, J.H.,Lee, E.S.,Moon, K.W.,Lee, I.M.,Park, D.W.,Kim, H.S.,Kim, M.G.,Choi, K.S.,Park, K.H. 한국전자통신연구원 2019 전자통신동향분석 Vol.34 No.5
Modern imaging technologies utilizing electromagnetic waves are indispensable in our daily lives. Applications, such as television and smartphone screens, radar imaging for weather forecast, and medical imaging, can be attributed to technology developments in various electromagnetic regions. Terahertz (THz) waves, electromagnetic (EM) waves located between far infrared and microwave regions, had left unexplored EM waves. Recent advances in technology have led to various two-dimensional and three-dimensional THz imaging techniques. In this article, we explain THz imaging techniques as well as the experimental results from our laboratory. Additionally, we introduce commercial THz cameras developed worldwide. Finally, we present the applications of THz imaging techniques.
신준환,최다혜,이의수,문기원,박동우,주경일,김무건,최경선,이일민,박경현,Shin, J.H.,Choi, D.H.,Lee, E.S.,Moon, K.W.,Park, D.W.,Joo, K.I.,Kim, M.G.,Choi, K.S.,Lee, I.M.,Park, K.H. 한국전자통신연구원 2020 전자통신동향분석 Vol.35 No.4
The terahertz (THz) region lies in between the millimeter and infrared spectral bands. A THz wave has the characteristics of non-invasiveness and non-ionization due to low photon energies, while having high penetrability in dielectrics. In addition, since the resonance frequencies of various molecules are included in the THz band, research on the application of spectral analysis and non-destructive testing has been widely studied. Towards this end, the research and development of THz detectors has become increasingly important in order to assess their applications in different areas such as astronomy, security, industrial non-destructive evaluations, biological applications, and wireless communications. In this report, we summarize the operating principles, characteristics, and utilization of various broadband technologies in THz detection devices. Further, we introduce the development status of our Schottky barrier diode technology as one of the broadband THz detectors that can be easily adopted as direct detectors in many fields of applications.