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박막 증착 공정을 이용한 수소이온 전도 고체산화물 연료전지에 대한 연구
하승범(Seungbum Ha),장익황(Ikwhang Chang),이윤호(Yoonho Lee),차석원(Suk Won Cha) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
In this study, various thin-film fabrication processes have been studied for manufacturing of Fuel Cell using BYZ(yttrium-doped barium zirconate) electrolyte. The fuel cell structure is Anode supported type, and Palladium foil and sputtered porous Platinum are for Anode electrode. BYZ electrolyte is deposited by PLD(Pulsed Laser Deposition) and porous Platinum is deposited for cathode by sputter. Palladium is deposited by ALD(Atomic Layer Deposition) between BYZ electrolyte and cathode to protect carbonation of BYZ. To get a good quality of each layer such as porous Pt electrode, Pd interlayer and BYZ electrolyte, deposition conditions of PLD, Sputter and ALD have been optimized.
하승범(Ha, Seungbum),지상훈(Jee, Sanghoon),와카스 하산 탄비르(Tanveer, Waqas Hassan),이윤호(Lee, Yoonho),차석원(Cha, Suk Won) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.11
Typical solid oxide fuel cells (SOFCs) have limited applications because they operate at high temperature due to low ionic conductivity of electrolyte. Thin film solid oxide fuel cell with yttria stabilized zirconia (YSZ) electrolyte is developed to decrease operating temperature. Pt/YSZ/Pt thin film SOFC was fabricated on anodic aluminum oxide (AAO). The crystalline structure of YSZ electrolyte by sputter is heavily depends on the roughness of porous Pt layer, which results in pinholes. To deposit YSZ electrolyte without pinholes and electrical shortage, it is necessary to deposit smoother and denser layer between Pt anode layer and YSZ layer by sputter. Atomic Layer Deposition (ALD) technique is used to deposit pre-YSZ layer, and it improved electrolyte quality. 300nm thick Bi-layered YSZ electrolyte was successfully deposited without electrical shortage.
신규 참여자들의 자활사업에 대한 인식유형에 관한 연구: 자활사업의 전망 및 자활의지를 중심으로
하승범 ( Ha Seungbum ),신원식 ( Shin Wonshik ) 한국사회보장학회 2020 사회보장연구 Vol.36 No.2
This study intends to grasp the perception types of new participants on the self-sufficiency program and to suggest the development of self-sufficiency program for new participants. With 31 statements related to the self-sufficiency program, Q sorting was conducting to 18 new participants. According to Q methodology, there were three types of new participants’ subjective perception. First, participants belonging to the type‘active self-sufficiency orientation’ perceive that self-sufficiency is good job and that participation in self-sufficiency program may help them overcome their difficult situations. They have active attitude on the job and self-sufficiency will. Second, those who belong to the type ‘passive self-sufficiency orientation’ think that participation in self-sufficiency program is inevitable choice. They perceive that self-sufficiency program can’t overcome their current difficult situations Third, the type ‘serene life orientation’ perceives that self-sufficiency program is able to maintain their livelihood and they think that the benefit is not low. But their self-sufficiency will is low. Therefore, this study stresses the necessity of differentiated and diverse self-sufficiency programs suited to the different characteristics of new participants. And it is necessary to continue to provide institutional support to new participants.
김범수(Beomsoo Kim),하승범(Seungbum Ha),이병길(Byunggil Lee),임원식(Wonsik Lim),차석원(Suk Won Cha) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper presents the induced mathematical modeling equations for evaluating the operation stability automatic transmission of heavy duty vehicle. This theoretical approach indicates that the linearized governing equations of system can be converted into eigen-value problems. if eigenvalues have positive number, we can predict the engine operating point locates unstable operating region. To be a stable state, the unstable operating point diverges toward a stable point which is able to maintain uniform velocity. Based on the previous theoretical analysis, we carried out simulation to show dynamic behavior of operating point. It is important to investigate the relation between engine and torque converter by performance matching. As a result of dynamic simulation, the suggested method is found to be reasonable for evaluating the operation stability of a torque converter.
김남욱 ( Namwook Kim ),윤영민 ( Youngmin Yoon ),하승범 ( Seungbum Ha ),임원식 ( Wonsik Lim ),박영일 ( Youngil Park ),이장무 ( Jangmoo Lee ) 한국신재생에너지학회 2005 신재생에너지 Vol.1 No.4
In this paper, a new drive system(SHS) for hybrid electric vehicle is proposed. As dual rotor hybrid electric vehicle using planetary gearsets, the SHS has the advantages of both series and parallel systems. The output speed and torque of SHS can be determined at specific point regardless of the engine`s operating point. When the size of generator which is used in SHS is same as in THS, the SHS has more activities of engine control due to the ability that is operated in lower speed range. To maximize the performance of system, we carried out optimization for the three parameters that are engine, motor1 and motor2. As the result of the optimization, we confirmed the SHS is more preferable to THS in fuel consumption and acceleration area.
차석원(Suk Won Cha),정종렬(Jongyul Jeong),서호원(Ho Won Seo),하승범(Seungbum Ha) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
It is critical that design engineers in a global business corporation collaborate efficiently with colleagues in branch offices located all over the world. This study discusses how students can be trained for such activity through a global design class. Students from three universities form a design team to perform a product design and prototyping. Student communication among universities is typically achieved by internet-based telecommunication systems that provide audio and video signal. Language, cultural difference and time difference pose a huge challenge to efficient team building. The lecturers play a key role in resolving conflicts between team members. Regardless of the outcome, students appreciate the global design experience under proper environment organized by the lectures.