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.

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

이 연구의 목적은 자활사업 신규참여자들의 자활사업에 대한 주관적 인식을 파악하고, 이를 토대로 신규참여자를 위한 자활사업 개선 방안을 제시하는 것이다. 자활사업과 관련된 31개의 진술문을 가지고, 신규참여자 18명을 대상으로 Q 분류를 하였으며, Q 요인 분석을 한 결과 인식유형은 세 가지로 나타났다. 첫째, ‘적극적 자활 추구형’으로 자활사업은 어려운 상황을 극복하게 할 수 있는 일자리이며, 일에 대해 적극적인 태도와 높은 자활의지를 보이며, 자활사업 참여를 통해 자립·자활이 가능하다고 인식한다. 둘째, ‘소극적 자활 추구형’은 자활사업은 어려운 상황에서 어쩔 수 없이 선택한 일자리이며, 낮은 급여와 현재 수준의 차별성 없는 자활사업만으로는 어려운 상황을 극복하는 것은 어렵다고 생각한다. 셋째, ‘참여 안주형’은 자활사업을 통해 생계를 유지할 수 있고, 자활급여 수준이 낮지 않다고 생각한다. 대체적으로 자활사업 참여에 만족하고 있으며, 지속적으로 참여하기를 원하고 있으며, 자활 의지는 낮다. 이 연구가 주는 함의는 지역자활센터 자활사업에 참여한지 2년 미만의 신규참여자의 주관적 인식에 부합하여, 위축되고 낮아진 자립·자활의지를 향상할 수 있는 제도적 지원, 다양하고 차별성 있는 자활사업 프로그램 도입, 자활사업 진입단계 맞춤형 프로그램의 개발과 지원이 요구된다는 것이다. 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.

언택트 관광의 고객경험이 고객인게이지먼트에 미치는 영향에 관한 연구: 언택트 성향과 시민행동의 조절효과를 중심으로

하승범(Ha, seungbum),소호(Su, hao),유홍도(Liu hongtao),염명동(Yan, mingdong) 한국관광레저학회 2021 한국관광레저학회 학술발표대회 Vol.2021 No.7

Deposition of Electrolyte for Intermediate Temperature Solid Oxide Fuel Cells by Combined Thin Film Deposition Techniques

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.

서비스 품질 차원의 상대적 중요성에 따른 만족 집단 구분의 차별적 의미에 관한 연구

서문식(Munshik Suh),하승범(Seungbum Ha),문현규(Hyungyu Moon) 한국경영학회 2015 經營學硏究 Vol.44 No.1

The purpose of this study was to apply the existing studies, which are related to the need for segmentation of customer satisfaction, to various service sectors. The importance segmentation of customer satisfaction differs in service sector, that is, some sectors require more precise segmentation of customer satisfaction. The primary objective of this study is to classify the service sectors based on the meaningful classification standards. The satisfaction of customers with service relates to the evaluation of service quality. Based on the existing studies, the service quality dimension is divided into the outcome quality, interaction quality, and physical environmental quality. The qualitative investigation was conducted to classify the service sectors where the specific quality dimension had a relatively important influence on the satisfaction. In addition, it was verified whether the classification based on qualitative investigation was actually reliable from quantitative standpoint. Through this process, it was found that the service sector with relatively important impact of physical environment quality was the ‘coffee shop’, and service sector with relatively important influence of interaction quality was the ‘bank’. Meanwhile, the service sector with relatively important effect of outcome quality was ‘large marts’. The differentiation of satisfaction groups was defined as moderator variable in order to verify whether it was meaningful to classify the satisfaction groups of respective service sectors into true satisfaction group and spurious satisfaction group. This study is meaningful in that it validated the moderating role based on the classification of satisfaction groups within the framework of existing studies that focused on the mediating role between the service quality dimension and loyalty in relation to the satisfaction.

토크컨버터의 작동 안정성 평가 방법

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.

신개념 하이브리드 동력장치 개발

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.

국제공동협업설계 및 실습과목에 대한 고찰

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.