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장유현,서성용 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Solution-processable dithieno[3,2-b:2’,3’-d]thiophene(DTT) derivatives, 2,6-bis(phenylethynyl)dithieno[3,2-b:2',3'-d]thiophene (BP-Et-DTT) and 2,6-bis(thiophen-2-ylethynyl)dithieno[3,2-b:2',3'-d]thiophene (BT-Et- DTT) were synthesized and characterized as solution-processable organic semiconductors for organic thin-film transistors (OTFTs). The highest hole mobility was 0.32 cm<sup>2</sup> V-1 s<sup>-1</sup> based on BP-Et-DTT thin films. The thin films exhibited micrometer-sized crystalline fiber structures which were aligned along the shearing direction, resulting in fiber-alignment-induced charge-transport anisotropy. Furthermore, bulk heterojunction (BHJ) ambipolar transistors were fabricated with an optimized blending ratio of BP-Et-DTT and the representative n-channel semiconductor, PDIFCN<sub>2</sub>. Complementary-like inverters were fabricated based on the two identical ambipolar transistors, resulting in moderate voltage gains of up to 16.
관광스타트업 창업경험에 대한 현상학적 연구 - 진화론적 관점에서 비즈니스 생태계를 중심으로 -
장유현 한국관광학회 2018 관광학연구 Vol.42 No.9
This study analyzed entrepreneurs' experience of Korean tourism start-ups initiated in the Korean business ecological system. Using phenomenological methods, in-depth interviews were conducted with 10 Entrepreneurs, with additional focus group interviews conducted with four members of that group. This study also used the theoretical evolutionary view, which was applied to the business life cycle. By the use of Giorgi's phenomenological approach, this study revealed that the four evolutionary stages could also nicely fit into the business ecological system. The results of this study categorized the concepts into four evolutionary stages,: variation, selection, duplication, and co-evolution. This study has significant contributions for the understanding of the entrepreneurial ecological business systems in the Korean tourism industry. Furthermore, it is expected to be a good starting point for future research on tourism start-ups, which are comparatively not so active in tourism research. 본 연구는 한국의 관광스타트업 창업자를 대상으로 심층면접법과 FGI를 사용하여 한국의 비즈니스 생태계에서의 관광부문의 창업경험에 대해 현상학적 연구방법으로 분석하였다. 최근 7년 이내 창업한 관광스타트업 창업자 10명을 대상으로 먼저 개별 심층면접을 진행하였고, 이후 이들 중 4명을 유의표집 방식으로 선별하여 표적 집단면접(FGI)를 시행하였다. 수집된 개념의 분석을 위해 진화론적 관점을 비즈니스 라이프 사이클에 투영하여 Giorgi의 현상학적 방법론 절차에 따라 수행하였다. 관광스타트업 창업경험을 비즈니스 생태계를 중심으로 진화론적 관점을 적용하여 변이, 선택, 복제, 공진화의 네 단계의 진화과정으로 나누었다. 분석결과 자율성과 다양성을 바탕으로 한 다양한 관광스타트업의 등장은 생태계의 지속성 확보를 가능하게 하는 원동력이라는 측면은 기존 연구의 결과와 맥을 같이 하는 것으로 나타났다. 반면 초기 창업단계에 집중된 지원정책은 양적인 단기 성과에는 주효하지만 관광 비즈니스 생태계의 지속가능성에는 큰 장애요인으로 작용하는 것으로 나타났다. 또한 타 분야와 달리, 관광의 특수성으로 인해 복제 가능성에는 분명한 한계가 드러났다. 본 연구의 의의는 기존의 계량분석 중심의 비즈니스 외형파악에서 벗어나 창업자의 실제 경험을 통해 관광부문의 창업현장의 실상 파악과 이를 통해 실제 필요로 하는 정책사업 방안을 제안한데 있다.
장유현 한국정밀공학회 2016 International Journal of Precision Engineering and Vol.17 No.11
In the Wolsung nuclear power plant, workers move the spent fuel bundles that have been maintained in the water to reduce the radiation level and temperature for several years. Spent fuel bundles under 5m of boron water are moved into a dry container with the naked eye. Therefore, it is not easy to maneuver the spent fuel bundle gripper (hereafter gripper) to the center of the spent fuel bundle with the naked eye. If a spent fuel bundle is hit by approaching the spent fuel bundle, there is a risk that some fuel rods will be separated. This study suggests a technique to prevent the collision of the gripper and a spent fuel bundle. An ultrasound sensor is used for the inspection of high radiation nuclear power plant components such as nuclear reactor pipes, and nuclear fuel rods in light-water nuclear power plants. An ultrasound beam field is calculated to select the frequency of ultrasound performance such as the near-field length and directivity. A test bed is fabricated with a multi-channel ultrasound system. Variation of peak amplitude with the lateral offset is analyzed to obtain the information of lateral offset and the deviation of normalized peak values of four ultrasound sensors used to derive the direction of offset.
Development of an Amphibious Robot for Visual Inspection of APR1400 NPP IRWST Strainer Assembly
장유현,김종성 한국원자력학회 2014 Nuclear Engineering and Technology Vol.46 No.3
An amphibious inspection robot system (hereafter AIROS) is being developed to visually inspect the in-containmentrefueling storage water tank (hereafter IRWST) strainer in APR1400 instead of a human diver. Four IRWST strainers arelocated in the IRWST, which is filled with boric acid water. Each strainer has 108 sub-assembly strainer fin modules thatshould be inspected with the VT-3 method according to Reg. guide 1.82 and the operation manual. AIROS has 6 thrusters forsubmarine voyage and 4 legs for walking on the top of the strainer. An inverse kinematic algorithm was implemented in therobot controller for exact walking on the top of the IRWST strainer. The IRWST strainer has several top cross braces that areextruded on the top of the strainer, which can be obstacles of walking on the strainer, to maintain the frame of the strainer. Therefore, a robot leg should arrive at the position beside the top cross brace. For this reason, we used an image processingtechnique to find the top cross brace in the sole camera image. The sole camera image is processed to find the existence of thetop cross brace using the cross edge detection algorithm in real time. A 5-DOF robot arm that has multiple camera modules forsimultaneous inspection of both sides can penetrate narrow gaps. For intuitive presentation of inspection results and formanagement of inspection data, inspection images are stored in the control PC with camera angles and positions to synthesizeand merge the images. The synthesized images are then mapped in a 3D CAD model of the IRWST strainer with the locationinformation. An IRWST strainer mock-up was fabricated to teach the robot arm scanning and gaiting. It is important to arriveat the designated position for inserting the robot arm into all of the gaps. Exact position control without anchor under the wateris not easy. Therefore, we designed the multi leg robot for the role of anchoring and positioning. Quadruped robot design ofinstalling sole cameras was a new approach for the exact and stable position control on the IRWST strainer, unlike atraditional robot for underwater facility inspection. The developed robot will be practically used to enhance the efficiency andreliability of the inspection of nuclear power plant components.