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블로워 기능이 장착된 차량 청소기용 모터 드라이브 개발
이대진(DaeJin Lee),김재혁(Jaehyuck Kim),선한걸(Han-Geol Seon),주민기(Min-Gi Joo),이영수(Young-Soo Lee),한만승(Man-Seung Han) 대한전기학회 2017 대한전기학회 학술대회 논문집 Vol.2017 No.4
최근 다양한 레저 활동이 증가함에 따라 야외활동에서 활용도를 높일 수 있도록 기존의 흡입기능 외에 블로워 기능이 적용된 차량용 청소기에 대한 관심이 증대되고 있다. 기존 청소기에 주로 사용되는 DC모터와 비교하여 내구성 및 흡입력이 향상되고 흡입 및 배기가 모두 가능한 차량용 진공청소기에 적용하기 위하여 SRM을 설계, 제작하고 다양한 성능시험을 통하여 적용 가능성을 검토해 보았다.
後漢 鄧太后 臨朝稱制의 性格 - 政治主導와 治者意識을 중심으로 -
이대진(Lee, DaeJin) 중국고중세사학회 2020 중국고중세사연구 Vol.58 No.-
‘The regency by the empress dowager 臨朝稱制 (Regency)’ occurred six times in Later Han. Among them, the case of ‘Empress Dowager Deng 鄧太后 (Deng)’ is noted, and her reign of regency took place over about 16 years. Her regent exhibits several main characteristics. First, While most of the Empress’s dependence on the clan member such as father or brother, in case of Deng, this aspect has disappeared after 4th year of Yongchu 永初 era. This shows the identity and confidence of Deng that she can stably adjust her politics without relying on the clan. Sencond, people with different opinions were also selected and appointed unless they criticized her regency. Third, Deng, in her name, made a ‘doctrine by empress dowager 皇太后詔’, went directly inside and outside of the palace, ordered various measures, and there were no restrictions on either space or field. Besides, certain people were sent to reconciliation meetings to intervene and convert public opinion. Especially, The Deng also took various measures, focusing especially on the resolution of disasters and the revival of Confucianism. This can be understood as the attempt of the Deng to adjust the herself into the ideology of the Confucian bureaucrats, and as self-determination as the actual ruler of the Later Han. Based on the consciousness of being a ruler, Deng actively controlled the clan and tried to spread the benevolent rule. Other regents also seemed to have this consciousness, but there was a difference between the empress in the degree of effort to practice consciousness. Not only that, there were many criticisms of other regents and its clan, while the criticism itself was very slight at that time and later, The Deng was proclaimed as the “Wenmu 文母 of the Han Dynasty”. This is a positive evaluation of the Deng’s efforts to have a Confucian literacy, to cultivate herself, to lead the politics by balancing the clan and bureaucracy. The Deng was developed differently from the other regents, and it was the main factor that could be maintained for a long time even in the special situation—the absent of the clan.
이대진(Daejin Lee),최원익(Wonik Choi) Korean Institute of Information Scientists and Eng 2017 정보과학회논문지 Vol.44 No.3
When using IFC data consisting of STEP schema based on the EXPRESS language, it is not easy for collaborating project stakeholders to share BIM modeling shape information. The IFC viewer application must be installed on the desktop PC to review the BIM modeling shape information defined within the IFC, because the IFC viewer application not only parse STEP structure information model but also process the 3D feature construction for a 3D visualization. Therefore, we propose a lightweight data structure design for web visualization by parsing IFC data and constructing 3D modeling data. Our experimental results show the weight reduction of IFC data is about 40% of original file size and the web visualization is able to see the same quality with all web browsers which support WebGL on PCs and smartphones. If applied research is conducted about the web visualization based on IFC data of the last construction phase, it could be utilized in various fields ranging from the facility maintenance to indoor location-based services.
차량용 Built-in 청소기용 SRM 드라이브 시스템 개발
이영수(Young-Soo Lee),노정민(Jeongmin Noh),이대진(Daejin Lee),김재혁(Jaehyuck Kim),선한걸(Han-Geol Seon),한만승(Man-Seung Han) 전력전자학회 2017 전력전자학회 논문지 Vol.22 No.3
This paper discusses the design and control of a switched reluctance motor (SRM) drive system for a built-in car vacuum cleaner. The growing popularity of outdoor activities and recreation has led the automobile industry to expand technologies that increase the convenience of vehicles, and thus, a built-in car vacuum cleaner was introduced. However, the existing DC motor of a vacuum cleaning system has several disadvantages, such as maintenance cost and lifespan issues of its commutator-brush structure. An SRM can be a good alternative to the existing DC motor because of its high-speed capability, long lifespan, low maintenance cost, and high efficiency, among other advantages. A prototype SRM drive is designed and manufactured to verify its feasibility for use in a built-in car vacuum cleaning system. Dynamic simulation is conducted to determine the optimal switching angle for maximum efficiency and minimum torque ripple. Load test, noise measurement, and suction-power tests are also carried out.