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이서준,윤새몬,강동원 청주대학교 산업과학연구소 2016 産業科學硏究 Vol.34 No.1
Organic-inorganic hybrid perovskite solar cells have received attentions due to high energy conversion efficiency with low cost and simple fabrication process. These are attributed to property of perovskite with high light-absorption coefficient and low recombination rate. Various structures and materials of solar cells have been applied, but optimal structure and material of organic-inorganic hybrid perovskite solar cells have been debating until nowadays because of a short period of study. So, in this paper, we investigated morphological control of organic-inorganic hybrid perovskite thin films to find the solution by optimizing spin-speed, solution concentration, and solvent washing treatment.
Solution for Efficient Vital Data Transmission and Storing in m-Health Environment
이서준,조균연,송승환,장진수,이광인,이태노,Lee, Seo-Joon,Cho, Gyoun-Yon,Song, Seung-Hwan,Jang, Jin-Soo,Lee, Kwang-In,Lee, Tae-Ro The Society of Digital Policy and Management 2015 디지털융복합연구 Vol.13 No.5
세계적으로 정부 재정에 상당한 영향을 주고 있는 보건의료 비용 문제를 해결하기 위해 m-Health가 등장하였다. 그러나 최근 저조한 m-Health의 결과물들은 m-Health 서비스 개혁의 필요성으로 이어졌다. 따라서 본 논문의 목적은 이와 같은 일환으로 m-Health 환경에서 효율적인 생체 데이터 전송 및 보관을 위한 방안을 제시하는 것이다. 연구방법으로는 생체 데이터를 효율적으로 전송 및 보관할 수 있는 시스템 및 알고리즘을 개발하였다. 분석 결과로 제시하는 솔루션의 효율성을 평가하기 위하여 전송되는 데이터의 압축률을 비교 평가하였다. 그 결과 본 논문의 압축률은 30.4배였다. 본 연구가 제시하는 시스템은 향후 m-Health에서 생체 정보를 모니터링 하는 시스템을 구축하도록 기여할 것으로 전망된다. In order to tackle healthcare expenditure problems that affects a crucial part of government finances world-wide, m-Health emerged as a solution. However, recent poor outcomes of m-Health led to the need for reform in m-Health services. Therefore the purpose of this research is to propose a solution for efficient vital data transmission and storing in m-Health environment as part of such initiative. Methods included development of an efficient system and algorithm for vital data. For results, the compression ratio of the proposed solution was compared and evaluated. Results showed a compression ratio of 30.4. The proposed system is envisioned to contribute to the future vital data monitoring system in m-Health.
가속도 센서를 사용한 마그네슘 합금 판재의 변형 및 파손 분석
이서준,김지선,정완진,이창환 한국금형공학회 2024 한국금형공학회지 Vol.18 No.1
Acceleration sensors can be used to detect failure and measure deformation in metal forming processes. In this study, the applicability of acceleration sensors for analysis of the metal forming process was studied. Magnesium alloy sheets (AZ31B-H24) with the thickness values of 1 mm, 2 mm, and 3 mm were used to perform the three most basic processes in the metal forming process such as tensile, bending, and 2D-draw bending test. The sensors were attached to the material. Acceleration signals occurring during material deformation were measured. For each experiment, we analyzed the changes in the acceleration of the sensor. In tensile deformation, a large acceleration occurred at the point of material failure. In bending, there was no significant acceleration at the point of material failure. The bending angle of the material was measured using the acceleration components. It was found that acceleration sensors can be used to detect fracture and measure deformation angles in the metal forming process.