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제지용 도공안료의 표면개질에 의한 도공지 물성과 인쇄적성에 관한 연구 (1)
민동진 ( Dong Jin Min ),조준형 ( Jung Hyung Cho ),이용규 ( Yong Kyu Lee ),김용식 ( Yong Sik Kim ) 한국공업화학회 2003 공업화학 Vol.14 No.2
제지산업에 경쟁력을 부여찰 수 있는 방법의 일환으로 제지용 무기안료외 표면을 개질처리하였다. 재지용 무기안료인 clay, talc, CaCO_3, TiO_2의 입도를 측정한 뒤, 선택된 모입자(clay,talc, CaCO_3)와 자입자(TiO_2)를 계산식에 의한 배합비로 혼합하였, 분체의 대전현상을 이용하여 모입자 주위에 자입자를 부착시킨 다음 고속기류 중 충격력으로 개질처러하였다. 표면개질시 자입자가 모입자에 흡착될 때의 에너지를 측정하여 입도 변화에 따른 표면개질 효율성을 측정하였다. 표면개질안료와 혼합안료의 백색도, 산란도 등을 측정하여 표면개질처리시 안료외 광학적 성질변화를 확인하였다. 그리고 표면개질된 안료를 액상에 투입하고, 입자전하측정기와 재타전위측정기를 이용하여 정전기적 성질변화를 측정하였다. 본 연구의 결과로부터, 표면개짙처리된 제지용 무기안료의 기본적인 분체물성이 개선되었음을 알 수 있었다. The surface of inorganic pigments was modified as an alternative method to provide a competitive edge for the nation`s paper industries. The particle sizes of inorganic pigments for paper applications such as clay, talc, CaCO_3, and TiO_2 were measured. The selected core particles and fine particles were then mixed at a calculated ratio. When the sample was electrified the fine particles adhered to the larger ones due to the static electricity. These powders were then modified by the impact force resulting from a very high-speed air circulation. During the surface modifying of pigments, the energy change caused by the fine powder adhering to the core powder was measured and utilized in examining the efficiency of the surface modification due to the change in particle size. The change of optical properties of pigment during the surface modification was confirmed by measuring the brightness and scattering rate of surface modified pigments and mixed pigments. After putting these surface modified pigments in water, their static electricity properties were measured with a particle charge detector and a zeta potential tester. From these results, it was revealed that some of the basic powder properties of paper-making inorganic pigment were improved.
반도체 capacitive 지문 센서 및 이미지 합성 방법
이정우,민동진,김원찬,Lee, Jeong-Woo,Min, Dong-Jin,Kim, Won-Chan 대한전자공학회 1999 電子工學會論文誌, D Vol.d36 No.2
본 논문에서는 저 비용, 고해상도 반도체 지문 센서칩에 대하여 논한다. 제작된 테스트 칩은 $64{\times}256$ 센싱 셀(sensing cell)로 구성되어 있으며, 칩의 크기는 $2.7mm{\times}10.8mm$이다. sensing cell 내부에서 일어나는 전하 재분포를 감지하는 새로운 방식을 이용하여 내부의 기생 캐패시턴스의 영향을 효과적으로 제거하는 방법을 제안하였다. 제안하는 방법은 센싱 셀의 감지 능력을 키우므로 센싱 셀의 크기를 줄일 수 있고, 따라서 고해상도의 이미지를 추출할 수 있다. 표준 0.6${\mu}m$ CMOS 공정을 이용하여 제작된 칩은 600dpi의 해상도를 가지는 지문 이미지를 추출한다. 제조 단가를 낮추기 위하여 지문의 부분 이미지들로부터 전체 지문 이미지를 얻어내는 이미지 합성 방법의 가능성과 문제점에 대해서도 논의하였다. This paper introduces a possibility of a low-cost, high-resolution fingerprint sensor chip. The test chip is composed of $64{\times}256$ sensing cells(chip size : $2.7mm{\times}10.8mm$). A new detection circuit of charge sharing is proposed, which eliminates the influences of internal parasitic copacitances. This the reduced sensing-capacitor size enables a high resolution of 600dpi, using even conventional 0.6${\mu}m$ CMOS process. The partial fingerprint image captured therefrom are synthesized into a full fingerprint image with a image synthesis algorithm. The problems and possibilities of image synthesis technique are also analyzed and discussed.
분체공학 , 유동층 , 고분자 , 재료 ( 무기 , 유기 ) : 건식 충격혼합법을 이용한 복합 무기안료의 제조 및 물성에 관한 연구
조준형(Jun Hyung Cho),민동진(Dong Jin Min) 한국화학공학회 2001 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.39 No.6
In this paper the functional composite-pigment was prepared by dry impact-blending method, using inorganic materials used for paper coating such as TiO_2, CaCO_3, and clay. Dry impact-blending is used for making new functional material by surface modification and composition. After considering particle size of inorganic pigment, selected core powder and fine powder were mixed at a suitable mixing ratio. When powder was electrified, the fine particles of them could be adhered on the larger ones called `core particles` by static electricity, and then formed an ordered mixture. Afterward, these were susceptible to be composited by impact force resulting from very high-speed air circulation. Composite pigment formed was tested with powder physics tester and resulted in improvement of both fluidity and flushing. It also resulted in excellent optical property. Since design of particle pigment and application to a field of paper can be come true, it is thought that complementation in terms of both principle and application is possible, and that R&D for the production of various functional paper products can be activated.
GIS용, Epoxy/μSilica-μAlumina Mixture Composites의 전기적, 기계적 특성연구
한훈종(Hun Jong Han),민동진(Dong Jin Min),신현우(Hyeon-Woo Shin),염철훈(Chul-Hoon Yeom),오진환(Jin-Hwan Oh),윤혜지(Hye-Ji Yoon),이성영(Sung-Young Lee),허윤강(Yoon Kang Heo),이우진(Woo Jin Lee),이지희(Jihee Lee),이동윤(Dong-Yoon Lee) 대한전기학회 2020 대한전기학회 학술대회 논문집 Vol.2020 No.7
TPMS Primitive 구조를 적용한 미세먼지 필터 최적화 설계
황수련(Su Ryeon Hwang),김지연(Ji Yeon Kim),민동진(Dong Jin Min),오하진(Ha Jin Oh),정성용(Sung Yong Jung) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11
As particulate matter (PM) increases as a by-product of industrial development, the development of efficient filters for PM reduction is required. Existing filters consume high energy due to their small pores. In this study, TPMS primitive structure was suggested to improve the PM filtration with lower energy consumption. The effect of porosity on PM collection and pressure drop was experimentally observed. Both PM collection and pressure drop were strongly related with the porosity. The highest efficiency was obtained with the porosity of 60%, and the pressure drop increased with the decrease of porosity. From the simulation results, it is confirmed that the occurrence of gap flow and recirculation inside TPMS structures having the porosity of 50 - 60% can enhance the filter performance. The TPMS based filter developed in this study is expected to be a novel PM reduction technology that is sustainable and can minimize energy use.