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Seungjun Lee,Hyun Kyoung Shon,Hyein Ha,Ja Yeon Lee,Min Chul Suh,Tae Geol Lee,Yongsup Park 한국진공학회 2021 한국진공학회 학술발표회초록집 Vol.2021 No.2
Solution processing of organic light-emitting diodes (OLEDs) layers has recently been studied as the next-generation manufacturing process of OLEDs. However, the device lifetime of solution-processed OLEDs is still inferior to compete with vacuum-deposited OLEDs. To understand a fundamental degradation mechanism of thermally annealed solution-processed OLEDs, we investigated depth profiles of organic layers in degraded solution-processed OLEDs by using X-ray photoelectron spectroscopy and time-of-flight secondary mass spectroscopy with argon gas cluster ion beam sputtering.
Identification of BIF1 locus that controls organ size via cell size control in Arabidopsis
Seungjun Lee,Inhye Lee,Soon-Ki Park,Moon-Soo Soh 한국육종학회 2012 한국육종학회 심포지엄 Vol.2012 No.07
Organ size control is a fundamental developmental processes for higher plants as well as a promising target trait for molecular breeding in crop plants. Genetic mechanisms how plant organs grow to a certain size remains still unclear. Here we present the identification and characterization of a genetic mutant, big flower1-1 (bif1-1) in Arabidopsis that exhibits bigger organ size primarily due to increased cell size. Genetic analysis indicated that it is a single, semi-dominant mutation. Phenotypic analysis showed that bif1-1 exerts pleiotropic effects: it caused bigger seed size, bigger seedling, bigger leaf, thicker stem, increased trichome branching, smaller fruit, and bigger pollen. Microscopic analysis suggested that the bigger organ size in bif1-1 mutant is primarily attributed to increased cell size. Gene expression analysis indicated that most of growth-control genes tested were not altered in bif1-1 mutant. Instead, expression of ARGOS and auxin-inducibility of ANT were reduced in bif1-1 mutant. Our ongoing positional on the corresponding gene would not only shed light on the molecular mechanisms how plants adopt final organ size but also provide a promising genetic resource for genetic engineering of flower- and seed-size in crop plants.
Lee, Inhye,Kim, Kuglae,Lee, Sumin,Lee, Seungjun,Hwang, Eunjin,Shin, Kihye,Kim, Dayoung,Choi, Jungki,Choi, Hyunmo,Cha, Jeong Seok,Kim, Hoyoung,Lee, Rin-A,Jeong, Suyeong,Kim, Jeongsik,Kim, Yumi,Nam, Hon Oxford University Press 2018 Journal of experimental botany Vol.69 No.15
<▼1><P>A missense mutation of <I>KARRIKIN-INSENSITIVE2</I>, <I>KAI2</I><SUP><I>ply2</I></SUP>, compromises its ligand-binding activity, which subsequently impairs KAI2-signaling and multiple aspects of light-dependent responses.</P></▼1><▼2><P><B>Abstract</B></P><P>A smoke-derived compound, karrikin (KAR), and an endogenous but as yet unidentified KARRIKIN INSENSITIVE2 (KAI2) ligand (KL) have been identified as chemical cues in higher plants that impact on multiple aspects of growth and development. Genetic screening of light-signaling mutants in <I>Arabidopsis thaliana</I> has identified a mutant designated as <I>ply2</I> (<I>pleiotropic long hypocotyl2</I>) that has pleiotropic light-response defects. In this study, we used positional cloning to identify the molecular lesion of <I>ply2</I> as a missense mutation of <I>KAI2</I>/<I>HYPOSENSITIVE TO LIGHT</I>, which causes a single amino acid substitution, Ala219Val. Physiological analysis and genetic epistasis analysis with the KL-signaling components <I>MORE AXILLARY GROWTH2</I> (<I>MAX2</I>) and <I>SUPPRESSOR OF MAX2 1</I> suggested that the pleiotropic phenotypes of the <I>ply2</I> mutant can be ascribed to a defect in KL-signaling. Molecular and biochemical analyses revealed that the mutant KAI2<SUP>ply2</SUP> protein is impaired in its ligand-binding activity. In support of this conclusion, X-ray crystallography studies suggested that the <I>KAI2</I><SUP><I>ply2</I></SUP> mutation not only results in a narrowed entrance gate for the ligand but also alters the structural flexibility of the helical lid domains. We discuss the structural implications of the Ala219 residue with regard to ligand-specific binding and signaling of KAI2, together with potential functions of KL-signaling in the context of the light-regulatory network in <I>Arabidopsis thaliana</I>.</P></▼2>
운동처방이 가능한 장애인 유산소 운동기구와 처방 관리 시스템 개발
이승준(Seungjun Lee),김성필(Seongphil Kim),박대성(Daesung Park),이혜림(Hyelim Lee),이범석(Bumsuk Lee) 한국HCI학회 2012 한국HCI학회 학술대회 Vol.2012 No.1
본 논문은 환자들의 운동 수행를 지속적으로 관리하여 처방을 가능하도록 하는 시스템을 개발한 것이다. 시스템은 세 가지로 설명할 수 있다. 첫째는 운동기구에 장착할 수 있는 정보수집장치(센서와 인터페이스 보드)의 개발이다. 둘째는 운동의 흥미를 주며, 운동 처방에 따른 시나리오를 화면에 구현하기 위한 비주얼 피드백이다. 마지막으로 의료진이 환자의 운동정보를 확인하며, 운동처방을 내릴 수 있는 운동처방 GUI와 시스템 구현이다. 이것은 장애인의 운동처방/관리를 가능하게 하여 장애의 개선에 효과적일 것으로 사료된다. The purpose of this study is to develop a prescribed management exercise system for patients with disabled by monitoring their performances continually. One of the development is an exercise data acquisition device(including sensor and interface board),which can connect to the exercise equipments. another one is to build a visual feedback indicating exercise performance for providing both prescription and entertainment. the other is a prescribed exercise GUI(Graphic User Interface) and system that doctors can manage patient's performance effectively, contributing the improvement of disability.
이승준(Seungjun Lee),이강진(Kangjin Lee),정종태(Jongtae Jung),하영철(Youngchul Ha),안승희(Seunghee Ahn),이철구(Chulgu Lee),허재영(Jaeyoung Her) 한국유체기계학회 2001 유체기계 연구개발 발표회 논문집 Vol.- No.-
Korea Gas Corporation(KOGAS) have constructed a gas flowmeters' calibration facilities at Jungdong Bucheon. The facilities consisting of 6 reference turbine meters can perform calibrations of large capacity natural gas flowmeters up to 9,600 ㎥/h at 95 kPa. This large capacity and high pressure natural gas facilities is traceable to the national standard of gas flow rate (KRISS). In this article the motive of construction and description of design are summarized.
Local Field Switching 방식의 MRAM 설계
이감영(Gamyoung Lee),이승연(Seungyeon Lee),이현주(Hyunjoo Lee),이승준(Seungjun Lee),신형순(Hyungsoon Shin) 대한전자공학회 2008 電子工學會論文誌-SD (Semiconductor and devices) Vol.45 No.8
본 논문에서는 새로운 스위칭 방식인 LFS (Local Field Switching)을 이용하여 설계한 128비트 MRAM (Magnetoresistive Random Access Memory)에 대해 기술하였다. LFS 방식은 MTJ (Magnetic Tunnel Junction)를 직접 통과해 흐르는 전류에 의해 형성되는 국소 자기장을 이용하여 MTJ의 극성을 변환시킨다. 이 방식은 MTJ와 전류의 거리가 가깝기 때문에 작은 전류로도 충분히 큰 자기장을 형성하므로 writing current가 적어도 된다. 또한 Digit Line이 없어도 되므로 half select disturbance가 발생하지 않아 기존 MTJ를 이용한 방식에 비해 셀 선택도가 우수하다. 설계한 MRAM은 1T(트랜지스터)-1MTJ의 메모리 셀 구조를 가지며 양방향 write driver와 mid-point reference cell block, current mode sense amplifier를 사용한다. 그리고 MTJ 공정 없이 회로 동작을 확인하기 위해 LFS-MTJ cell을 CMOS emulation cell로 대체하였다. 설계한 회로를 6 metal을 사용하는 0.18㎛ CMOS 공정으로 구현하였고 제작된 chip을 custom board 상에서 테스트하여 동작을 확인하였다. In this paper, we describe a design of a 128bit MRAM based on a new switching architecture which is Local Field Switching(LFS). LFS uses a local magnetic field generated by the current flowing through an MTJ. This mode reduces the writing current since small current can induce large magnetic field because of close distance between MTJ and the current. It also improves the cell selectivity over using conventional MTJ architecture because it doesn't need a digit line for writing. The MRAM has 1-Transistor 1-Magnetic Tunnel Junction (1T-1MTJ) memory cell structure and uses a bidirectional write driver, a mid-point reference cell block and a current mode sense amplifier. CMOS emulation cell is adopted as an LFS-MTJ cell to verify the operation of the circuit without the MTJ process. The memory circuit is fabricated using a 0.18 ㎛ CMOS technology with six layers of metal and tested on custom board.