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전개성능을 고려한 대형 전개형 SAR 안테나의 회전스프링 힌지의 강성 최적설계
김동연,임재혁,장태성,차원호,이소정,오현웅,김경원,Kim, Dong-Yeon,Lim, Jae Hyuk,Jang, Tae-Seong,Cha, Won Ho,Lee, So-Jeong,Oh, Hyun-Ung,Kim, Kyung-Won 항공우주시스템공학회 2019 항공우주시스템공학회지 Vol.13 No.3
본 연구에서는 전개성능을 고려한 대형 전개형 SAR 안테나의 회전스프링 힌지의 강성 최적설계에 대해 기술한다. 대형 전개형 SAR 안테나는 발사환경에서는 접혀 있다가 궤도에서 임무를 수행할 때 펼치게 된다. 이러한 조건에서 여러 장으로 구성된 안테나 패널을 주어진 시간 내에 최소의 충격으로 전개할 수 있도록 회전스프링 힌지의 적절한 강성을 찾는 것은 매우 중요하다. 회전스프링 강성이 강하면 완전 전개시점에서 발생하는 큰 충격하중이 구조체에 손상을 주며, 약하면 전개 저항으로 인해 완전전개를 보장할 수 없기 때문이다. 이러한 문제를 해결하기 위해서 RecurDyn을 이용한 다물체동역학 해석모델을 생성하였으며 전개해석을 통해 전개성능(전개시간 전개충격하중)을 도출하였다 최적의 회전스프링 강성을 찾기 위해 이에 따른 전개성능을 반응표면법을 통해 근사화 시켰으며 최적설계를 수행하여 적절한 회전스프링의 강성 값을 도출하였다. This paper describes the stiffness optimization of the torsion spring hinge of the large SAR antenna considering the deployment performance. A large SAR antenna is folded in a launch environment and then unfolded when performing a mission in orbit. Under these conditions, it is very important to find the proper stiffness of the torsion spring hinge so that the antenna panels can be deployed with minimal impact in a given time. If the torsion spring stiffness is high, a large impact load at the time of full deployment damages the structure. If it is weak, it cannot guarantee full deployment due to the deployment resistance. A multi-body dynamics analysis model was developed to solve this problem using RecurDyn and the development performance were predicted in terms of: development time, latching force, and torque margin through deployment analysis. In order to find the optimum torsion spring stiffness, the deployment performance was approximated by the response surface method (RSM) and the optimal design was performed to derive the appropriate stiffness value of the rotating springs.
W-대역 밀리미터파 탐색기용 광대역 모노펄스 비교기 설계
김동연(Dong-Yeon Kim),임영준(Youngjoon Lim),정채현(Chae-Hyun Jung),박창현(Chang-Hyun Park),남상욱(Sangwook Nam) 한국전자파학회 2016 한국전자파학회논문지 Vol.27 No.2
본 논문은 도파관 구조를 이용한 W-대역 밀리미터파 탐색기용 광대역 모노펄스 비교기 설계를 제안한다. 제안하는 구조의 핵심 아이디어는 90° 하이브리드에 자기보상 위상천이기를 결합하여 광대역 180° 하이브리드를 구현하는 것이다. 일반적인 위상천이기는 협대역 특성을 가지므로 다수의 위상천이기가 사용될 경우, 안테나를 포함한 전체 시스템의 운용 대역폭을 제한하는 단점이 있다. 제안하는 비교기는 광대역 특성을 가지는 자기보상 위상천이기를 사용하므로 이러한 문제를 완화시킬 수 있다. 설계된 비교기는 도파관 구조를 이용하여 손실 특성이 우수하다. 또한, 포트간 크기 및 위상 응답에서 광대역 특성을 보인다. This paper proposes a design of W-band mm-wave wideband monopulse comparator using waveguide structure for applications. The main idea of proposed design is to combine a self-compensating phase shifter on 90° hybrid for wideband 180° hybrid. Using multiple conventional phase shifters, because of their narrow-band characteristics, tends to restrict working bandwidth of system including antennas. Proposed comparator could relieve the problem since it applies the self- compensating phase shifter. The comparator has waveguide structure so it shows excellent characteristic in loss. It also show wideband characteristic in amplitude and phase response between ports.
꼴라쥬 미술치료가 장애아동 어머니의 양육스트레스에 미치는 효과
김동연(Kim Dong Yeun),윤현주(Yoon Hyun Ju) 한국재활심리학회 2002 재활심리연구 Vol.9 No.1
The purpose of this study is to research what the art therapy by collage has influence upon rearing stress as make the mental retardation children s mothers an object. The concrete study contents are as mentioned below. First, analyze and bring light on the effects that the art therapy by collage influence upon rearing stress of mental retardation children s mothers as classified by sessions. Second, bring light on the effects that the art therapy by collage influence upon rearing stress related to parental distress. Third. bring light on the effects that the art therapy by collage influence upon rearing stress related to parent-child dysfunctional interaction. Fourth, bring light on the effects that the art therapy by collage influence upon rearing stress related to difficult child. This study was enforced making two different groups, among mental retardation children s mothers aged from 34 to 43 years old, as one experimental group consists of 6 persons who agreed to a participation of the art therapy, and the other one controlled group consists of 6 persons who did not agree to a participation of the art therapy. Compared before the fact & after the fact using PSI / SF measured the rearing stress, and the study consequence analyzed before the fact & after the fact of both of the experimental group and the controlled group as used the sessional analysis and PSI / SF. Conclusion of this study is as mentioned below. First, as a result of alteration of rearing stress by sessional analysis, the fact that the art therapy by collage helped rearing stress of the mental retardation children s mothers to be reduced. Second, we could realize that the art therapy by collage affected to reduce the rearing stress related to parental distress. Third, the art therapy by collage affected to reduce the rearing stress related to parent-child dysfunctional interaction. Fourth, the art therapy by collage affected to reduce the rearing stress related to difficult child. Therefore, according to this study, it has been brought to light that the art therapy by collage would be effective for the rearing stress of mental retardation children s mothers.
전착법에 의해 제작된 Ni(OH)₂ 나노 시트의 표면 관찰 및 분석
김동연(Dong Yeon Kim),손인준(Injoon Son),최문현(Mun-Hyun Choi) 한국표면공학회 2021 한국표면공학회지 Vol.54 No.3
The pseudocapacitor has a high energy density characteristic because it accumulates charges through a paradic redox reaction. However, due to its strong insulation properties, metal hydroxides should be designed as structural systems optimized for charge transfer to support fast electron transport. Also, Nickel material is weak to heat and is easily deformed when used as a cathode material, so stability must be secured. In this study, nickel hydroxide was produced by electrodeposition to secure the stability of nickel. Electrodeposition is a synthetic method suitable for growing optimized nickel hydroxide because it allows fine control. Nickel hydroxide (Ni(OH)₂) is a metal hydroxide used as a pseudocapacitor anode due to its high capacitance, electrical conductivity and resistance. Therefore, in order to determine how Ni(OH)₂ nanosheets are formed and what are the optimization conditions, various measurement methods were used to focus on structural growth of nanosheets produced by electrodeposition.
PET영상용 미토콘드리아 막전위 감지기 (4-[18F]Fluorophenyl)triphenylphosphonium의 합성
김동연 ( Dong Yeon Kim ),유국현 ( Kook Hyun Yu ),범희승 ( Hee Seung Bom ),민정준 ( Jung Joon Min ) 대한핵의학회 2007 핵의학 분자영상 Vol.41 No.6
목적: Tetraphenylphosphonium (TPP) salts를 비롯한 지용성 양이온들은 혈장 및 미토콘드리아막을 쉽게 통과할 수 있을 뿐 아니라 미토콘드리아 내의 음 전압에 이끌려 미토콘드리아의 내부에 직접적으로 섭취된다. 또한 tetraphenylphosphonium (TPP) salts는 암세포에 직접적으로 섭취될 뿐 아니라 미토콘드리아의 활동이 활발한 심근에서도 직접적 섭취가 일어나는 것으로 보고되어 있다. 따라서 이러한 특징을 가지는 tetraphenylphosphonium (TPP) salts에 [18F]fluoride를 표지 할 수 있다면 암의 진단 및 미토콘드리아의 기능에 대해 연구 할 수 있는 새로운 분자 영상 추적자로써 사용할 수 있을 것이다. 대상 및 방법: 기준 물질인 (4-fluorophenyl)triphenylphosphonium (TPP)을 단일 반응으로 합성 하였으며, [18F]이 표지된 [18F]TPP는 무담체 [18F]fluoride와 전구체인 4-iodophenyltrimethylammonium iodide를 이용하여 Kryptofix- 2.2.2와 K2CO3존재 하에 두 단계의 반응으로 합성하였다. 결과: 기준물질인 (4-fluorophenyl) triphenylphosphonium (TPP)은 60%의 수율로 합성 되었으며, 표지 화합물인 [18F]TPP의 방사 화학적 수율은 10-15%였다. 또한 radio TLC로 확인한 방사 화학적 순도는 95.57±0.51% (n=11)이었다. 결론: 미토콘드리아의 막전위 차를 이용한 암 또는 심근 영상제제인 (4-[18F]fluorophenyl) triphenylphosphonium의 합성에 성공하였다. 하지만 전임상, 임상에의 응용을 위해서는 방사화학적 수율을 더 개선시켜야 할 것이다. Purpose: Lipophilic cations including tetraphenylphosphonium (TPP) salts penetrate the hydrophobic barriers of the plasma and mitochondrial membranes, resulting in accumulation in mitochondria in response to the negative inner transmembrane potentials. The development of radiolabeled phosphonium cations as a noninvasive imaging agent may serve as a new molecular voltage sensor probe to investigate the role of mitochondria in the pathophysiology and diagnosis of cancer. Materials and Methods: We have synthesized a reference compound (4-fluorophenyl)triphenylphosphonium (TPP) and a labeled compound [18F]TPP via two step nucleophilic substitution of no-carrier-added [18F]fluoride with the precursor, 4-iodophenyltrimethylammonium iodide, in the presence of Kryptofix-2.2.2 and K2CO3. Result: The reference compound (4-fluorophenyl)triphenylphosphonium (TPP) was synthesized in 60% yield. The radiolabeled compound [18F]TPP was synthesized in 10~15% yield. The radiochemical purity of the [18F]TPP was 95.57±0.51% (n=11). Conclusion: [18F]TPP was successfully synthesized that might have a potential to be utilized as a novel myocardial or cancer imaging agent for PET. However, it is required to improve the radiochemical yield to apply [18F]TPP in preclinical or clinical researches. (Nucl Med Mol Imaging 2007;41(6):561-565)