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박지수,황수현,오원제,이수호,정채환,이재형,Park, Ji Su,Hwang, Soo Hyun,Oh, Won Je,Lee, Su Ho,Jeong, Chae Hwan,Lee, Jae Hyeong 한국전기전자재료학회 2018 전기전자재료학회논문지 Vol.31 No.5
In this work, we conducted a study on cell strings of high efficiency and high power solar cell modules via simulation. In contrast to the conventional module manufacturing method, the simulation was performed by connecting cutting cells divided into four parts from 6-in size using the electrically conductive adhesive (ECA). The resistance of the ECA added in series connection was extracted using an experimental method. This resistance was found to be $3m{\Omega}$. Based on this simulation, we verified the change in efficiency of the string as a function of the number of cutting cell connections. Consequently, the cutting cell efficiency of the first 20.08% was significantly increased to 20.63% until the fifth connection; however, for further connections, it was confirmed that the efficiency was saturated to 20.8%. Connecting cutting cells using ECA improves the efficiency of the string; therefore, it is expected that it will be possible to fabricate modules with high efficiency and high power.
디지털 TV EPG 사용자 요구 기능 도출 및 워킹 프로토타잎 개발
박지수,이우훈,류동석,Park, Ji-Su,Lee, U-Hun,Ryu, Dong-Seok 대한인간공학회 2004 大韓人間工學會誌 Vol.23 No.2
Multichannel on digital TV not only gave opportunities to the TV audience to view a wide range of programs. but also made it difficult for them to search for the program which they plan to view among over 1000 programs broadcasted on more than 100 channels. In this paper the functions of EPG (Electronic Program Guides) required by the users on digital TV were derived from the systematic analysis of multichannel viewing situations. In the situation analysis the situations where they viewed programs on more than 100 channels were generated systematically and the viewing processes in those situations were analyzed to identify user needs and derive the required functions of EPG. We surveyed the viewing behavior of the audience who subscribed to a digital satellite broadcast. SkyPerfecTV. in Tokyo. Japan. The purpose of the survey was to verify the validity of the functions derived from the situation analysis and to identify hidden user needs which were difficult to in the situation analysis. The functions were implemented on a working prototype of EPG based on a digital TV simulator which broadcasts 500 programs on 100 channels and can be controlled by three working prototypes of personal remote controllers. The working prototype will be used in Participatory Design to make it possible for the users to experience and verify the usefulness of the required functions of EPG and also find problems in user interface design of EPG
박지수,길준민,Park, Ji Su,Gil, Joon-Min 한국정보처리학회 2020 정보처리학회논문지. 소프트웨어 및 데이터 공학 Vol.9 No.11
에듀테크는 교육(Education)과 기술(Technology)의 합성된 단어로서, 4차 산업혁명 시대의 교육 패러다임이다. 이는 4차 산업혁명의 빅데이터(Bigdata), 인공지능(AI), 로봇, 가상현실(Virtual reality; VR) 등 정보통신기술(ICT)을 활용한 차세대 교육을 의미한다. ICT에서의 교육은 온라인 강의로 이러닝(e-Learning)이 사용되고 있으나, 코로나-19로 인해 비대면 교육에 대한 수유가 급증함에 따라 이러닝과 함께 에듀테크가 주목받고 있다. 따라서 본 논문에서는 블록체인 기반의 배지서비스 플랫폼, 시뮬레이션 기반 협동형 이러닝 시스템, 동영상 영어사전, 그리고 블록체인 기반의 접근제어 감사시스템에 대한 심사 완료된 논문들을 분석한다. Edutech is a compound word of education and technology, and is an educational paradigm in the era of the 4th industrial revolution. This refers to next-generation education using information and communication technology (ICT) such as big data, artificial intelligence (AI), robots, and virtual reality (VR) of the 4th industrial revolution. e-Learning is being used as an online lecture for education in ICT, but edutech is attracting attention along with e-learning as the feeding of non-face-to-face education has rapidly increased due to COVID-19. Therefore, this paper summarizes the reviewed papers on the blockchain-based badge service platform, simulation-based collaborative e-Learning system, video English dictionary, and blockchain-based access control audit system.
박지수(Ji-Su Park),이현우(Hyun-Woo Lee),김철(Chul Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
A finite element method to die stress and deformation analysis in cold forging is presented in this paper. The stress analysis of die has been performed after shrink fitting by using the DEFORM-2D and the Lame's equation. According to the variation of interferences and diameter rations, the radial stress has been evaluated. The comparison of compressive stress and tensile stress between die of using field interference and die of using theory interference.
Isosorbide가 함유된 바이오 기반 PET와 polycarbonate 블렌드의 제조 및 특성 연구
박지수(Park, Ji-Su),남병욱(Nam, Byeong-Uk),박준서(Park, Jun-Seo) 한국산학기술학회 2014 한국산학기술학회논문지 Vol.15 No.2
PEIT는 옥수수와 같은 재생 가능한 자원에서 유래한 isosorbide monomer를 이용하여 bio-contents를 함유하고 있는 PET이다. 하지만 isosorbide contents가 향상될수록 기계적물성이 감소하는 단점이 있다. 본 연구에서는 우수한 기계적 물성을 가지고 있는 polycarbonate를 이용하여 PEIT의 단점을 보완하고, 또한 PEIT를 이용하여 PC의 인장신 율 향상을 통해 성형가공성을 개선하고자 하였다. 이축압출기를 통해 제조한 PEIT/PC 블렌드에서 polycarbonate가 모 폴로지, 유리전이온도거동, 열적안정성 및 기계적 물성에 미치는 영향을 확인하기 위해 FE-SEM, DMA, TGA, UTM 및 Izod impact tester를 통하여 분석을 수행하였다. 이로써 우수한 기계적 물성을 가진 polycarbonate는 PEIT와 상용 성이 있음을 확인하였으며, 특히 PEIT25PC75 조성에서 열적 안정성 및 기계적 특성의 향상이 뛰어난 것을 알 수 있었다. Poly(ethylene-co-isosorbide terephthalate) (PEIT) is interest in polymer which has isosorbide monomer that is renewable resources such as corn. However, there is important drawback which is low mechnical properties as increasing isosorbide contents. In this study, polycarbonate used to make up for drawback of mechanical properties of PEIT. In addition, PEIT used to improve the tensile elongation of polycarbonate because PEIT has good sheet proccessability. The effect of polycarbonate on morphology, thermal and mechanical properties were investigated using FE-SEM, DMA, TGA, UTM, and notched izod impact strength tester. As a result of this study, PEIT/PC blends were in compatible system and polycarbonate can act as an improvement of thermal stability and mechanical properties in the blends.
박지수 ( Ji Su Park ),최범순 ( Choi Beom Soon ) 한국정보처리학회 2021 정보처리학회논문지. 소프트웨어 및 데이터 공학 Vol.10 No.1
실시간 화상교육은 원격지에서 강의자와 학습자의 면대면 교육을 대체하는 효과적인 수업 운영방식으로 활용되고 있다. 하지만 기존의 영상통화 및 화상회의 시스템을 활용하는 형태가 주를 이루고 있으며 이는 영상을 통한 강의에 치중하게 되어 어학교육에서 효과성을 보이고 있다. 그러나 그 외의 교육에서는 활용도가 미비한 실정이다. 최근 코로나로 인해 영상 중심의 화상 교육이 있으면서 화상 회의 시스템이 가지는 영상 중심 화상교육의 제한점을 개선하여 강의자와 학습 참여자 모두에게 수업 중 활용할 수 있는 기능을 제공한다. 본 논문에서는 수학교육에서 효과성을 향상시킬 수 있는 실시간 화상 시스템의 설계 모델을 제시한다. The real-time video education is used as an effective method of operating classes that replaces face-to-face education of instructors and learners in remote areas. However, the existing video call and video conferences system is mainly used, and this is effective in linguistic education because it focuses on lecture through video, but it is not utilized in other education. In this paper, we propose a design model of real-time video system that can improve the effectiveness of science curriculum and mathematics education by providing the functions that can be utilized during class by improving limitations of image - oriented image education.