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착화제를 이용한 치환동 도금층의 밀착력 향상에 관한 연구
구석본(Seokbon Koo),전준미(Jumi Jeon),허진영(Jinyoung Hur),이홍기(Hongkee Lee) 한국표면공학회 2015 한국표면공학회지 Vol.48 No.1
Amino-carboxyl acid as a complexing agent in acid copper sulfate solution was utilized to improve the adhesion of immersion copper layer for steel wire. According to the tape test results, regardless of alloy composition of the wire, the adhesion of immersion copper layer was improved with the addition of aminocarboxyl acid. The incorporation of H and Fe in the plating layer was analyzed by TOF-SIMS. The H and Fe were detected at the entire coating layer without any addition of amino-carboxyl acid. However, with addition of amino-carboxyl acid, the H and Fe were scarcely detected at the coating layer.
태양돛 시험용 큐브위성 CNUSAIL-1의 임무 및 시스템 개념설계
구소연(Soyeon Koo),김경훈(Gyeonghun Kim),유연아(Yeona Yoo),송수아(Sua Song),김성근(Sungkeun Kim),오복영(Bockyoung Oh),우범기(Beomki Woo),한창구(Chang-Gu Han),김승균(Seungkeun Kim),석진영(Jinyoung Suk),한상혁(Sanghyuck Han),최기혁(Gi-Hyu 한국항공우주학회 2014 韓國航空宇宙學會誌 Vol.42 No.7
CNUSAIL-1은 태양돛을 탑재한 3U크기의 큐브위성이다. 주 임무는 저궤도에서 태양돛을 전개하는 것이며, 추가적으로 태양돛 전개와 태양돛 운용에 따른 위성의 자세/궤도변화를 확인하는 임무를 수행한다. 이를 위해, 위성의 각 시스템은 위성의 동적 데이터와 태양돛 작동 사진을 수집하고 지상국으로 전송한다. 본 논문에서는 이와 같은 임무를 수행하는 CNUSAIL-1의 태양돛 임무를 소개하고 시스템 개념설계 결과를 나타낸다. 탑재체인 태양돛의 구동 및 운용 원리를 구현하고, 버스시스템을 자세제어계, 통신계, 전력계, 명령 및 데이터 처리계, 구조 및 열 제어계로 나누어 개념 설계를 수행한다. The CNUSAIL-1 project aims to develop and operate a 3U-sized cube satellite with solar sail mechanism. The primary mission is to successfully deploy the solar sail in a low earth orbit, and the secondary mission is to collect the scientific data for the effect of the solar sail deployment and operation on orbit maneuver and attitude change of the cube satellite. For this, the bus system will collect and transmit the dynamic data of the satellite and the visual images of the solar sail operation. This paper describes solar sail mission and conceptual design of CNUSAIL-1. The actuation/operation of the solar sail and the bus system are preliminarily designed in terms of attitude control system, communication system, electrical power system, command and data handling system, structure and thermal control system is designed.
설파민산 니켈-코발트 합금도금 박막 물성에 대한 실험 연구
구석본(Seokbon Koo),전준미(Junmi Jeon),이창면(Changmyeon Lee),허진영(Jinyoung Hur),이홍기(HongKee Lee) 한국표면공학회 2017 한국표면공학회지 Vol.50 No.1
The electrodeposition of Ni-Co alloy from a sulfamate bath was investigated. The cobalt content in the Ni-Co deposits is more influenced by the temperature or stirring effect than the current density in the process parameters. As cobalt contents in the Ni-Co deposited layer increased from 0 wt.% up to 43 wt.%, hardness value of the layer rised from 400 Hv up to 700 Hv and crystal orientation (111) increased. However, (200) and crystal size significantly reduced. The tensile and yield strength also increased, while the modulus of elasticity showed the maximum value of 10.4 N/㎟ at 29 wt.%.
무인 항공기의 함상 자동 착륙을 위한 유도제어 시스템 설계
구소연(Soyeon Koo),이동우(Dongwoo Lee),김기준(Kijoon Kim),라충길(Chung-gil Ra),김승균(Seungkeun Kim),석진영(Jinyoung Suk) 제어로봇시스템학회 2014 제어·로봇·시스템학회 논문지 Vol.20 No.11
This paper presents the guidance and control design for automatic carrier landing of a UAV (Unmanned Aerial Vehicle). Differently from automatic landing on a runway on the ground, the motion of a carrier deck is not fixed and affected by external factors such as ship movement and sea state. For this reason, robust guidance/control law is required for safe shipboard landing by taking the relative geometry between the UAV and the carrier deck into account. In this work, linear quadratic optimal controller and longitudinal/lateral trajectory tracking guidance algorithm are developed based on a linear UAV model. The feasibility of the proposed control scheme and guidance law for the carrier landing are verified via numerical simulations using X-Plane and Matlab/simulink.
피로인산동욕의 무기첨가제에 의한 전해동박의 특성에 관한 연구
구석본(Seokbon Koo),허진영(Jinyoung Hur),이홍기(Hongkee Lee) 한국표면공학회 2014 한국표면공학회지 Vol.47 No.1
The copper deposit on steel plate was prepared by pyrophosphate copper plating solution made with variation of inorganic additive. NH₄OH and NH₄NO₃ were used as inorganic additives. The copper layer characteristics - tensile strength, crystallite size and crystal orientation - were evaluated by X-ray diffraction and Universal Test Machine. The presence of ammonium nitrate results in reduction of average roughness value from 0.08 μm to 0.03 μm. In pyrophosphate copper plating solution without Inorganic additive, tensile strength of electrodeposit copper foil was reduced from 600 MPa to 180 MPa after 7 days aging. However, when adding ammonium nitrate, there was almost no change of tensile strength, intensity of crystal orientation - (111), (200) and (220) - and crystallite size (2~30 nm).
이한민(Hanmin Lee),남용윤(Yong-Youn Nam),이종원(Jong-Won Lee),박성환(Seong-Whan Park),김은기(Eun-Ki Kim),구진영(JinYoung Koo) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
It is considered to be an important subject to connect mid-surface patches for generating shell model from solid model automatically. This paper describes a concrete method of mid-surface patch connection based on graph representation. Using PMMG(pair face & mid-surface mapping graph), it can be determined which edge of a mid-surface patch should be extended. After that, mid-surface patches are extended, trimmed and connected to generate a complete shell model.