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김윤기,신근영 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.94 No.-
A functionalized phosphorene/polypyrrole (FPPY) hybrid nanomaterial was prepared via a mechanochemicalprocess and chemical oxidative polymerization. The polymerization of polypyrrole (PPY) on thesurface of two-dimensional phosphorene was investigated in detail. The amide bond formation of theFPPY hybrid improved the interfacial interaction between the PPY and phosphorene. The specificcapacitance of the FPPY was 411.5 F g 1, which was approximately four times that of pristine PPY(106 F g 1). Additionally, hybridization improved the structural stability of PPY, yielding a cycle stability 2times higher than that of pristine PPY. To the best of our knowledge, this is thefirst report on the potentialof phosphorene hybridized with conducting polymers for practical energy-storage applications.
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김윤기,김현우,황요섭,이장명 제어로봇시스템학회 2011 제어로봇시스템학회 각 지부별 자료집 Vol.2011 No.7
This paper studied the basic algorithm to use the PDR system. PDR system is technology that detect position with assume gait of pedestrian. sensor position and algorithm is important. Because gait detect must have correct position. To assume the step using the 3-axis acceleration, we get the data according to the position of sensor that is attached to the waist. After that, we compared the number of step and distance depending on the speed of agit. As a result of the experiment, center of waist is a good position because it is easy to process the data en bloc. So it’s more effective to detect the sensor data of the step. According to the pace speed, a slow pace and normal pace are easy to detect the step and the result has error in case of a quick step.
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Capacitance enhancement of polyaniline/MoS<sub>2</sub> composite by conductivity augmentation
김윤기,장정식 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Polyaniline has been received significant attentions for its distinctive electrochemical features, such as faradaic charge transfer, and great electrical conductivity. Nonetheless, electrochemical stability is one of the main frailties of conducting polymers. Molybdenum disulfide (MoS<sub>2</sub>) can act as a staunch substrate of polyaniline, enhancing the overall capacitance as well due to its electrochemical activities. This increment is primarily from the electrical conductivity enhancement. Not only the abated internal resistance between polyaniline and MoS<sub>2</sub>, but the improved arrangement of polyaniline fibers induces greater conductivity and performance of the polyaniline/MoS<sub>2</sub> composite.
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Latent Dirichlet Allocation(LDA)을 이용한 시대별 양전쟁점 변화분석
김윤기 한국지적학회 2022 한국지적학회지 Vol.38 No.1
The primary purpose of this study is to analyze the trends of Yangjeon(Land Surveying) issues over time using Latent Dirichlet Allocation(LDA). To accomplish this purpose, I examined related theories and previous researches and set up four research questions based on them. To find out the answers to the research questions, I collected the Yangjeon documents related to the King Seongjong, the King Injo and the King Sukjong from the Annals of the Joseon Dynasty and conducted LDA analysis on them. As a result of the study, I confirmed that there were ten major Yangjeon issues in the Joseon Dynasty. Among them, the request of conducting Yangjeon, the demand for stopping Yangjeon due to flood and choosing correct Yangjeon ruler seemed to be the vital Yangjeon issues in Joseon Dynasty. Also, most major Yangjeon issues have been found to show significant differences over time. To analyze the changing patterns of the Yangjeon issues correctly over time, we need to understand the various situations of the times from a systematic point of view. 본 연구의 주된 목적은 Latent Dirichlet Allocation(LDA)를 이용하여 시대별 양전쟁점의 변화추이를 분석하는 것이다. 이러한 목적을 달성하기 위해 본 연구는 관련 이론과 선행연구들을 검토하였고 이를 토대로 4개의 연구 질문을 설정하였다. 연구 질문들에 대한 답을 구하기 위해 본 연구는 조선시대에서 양전 사업이 전국적으로 시행되었던 성종시대, 인조시대 그리고 숙종시대의 양전관련 문서들을 조선왕조실록에서 수집한 다음 LDA분석을 실시하였다. 분석의 결과, 조선시대에는 10개의 주요양전쟁점이 존재하였으며 그중에서도 양전시행여부, 수해로 인한 양전정지 그리고 양전척문제가 핵심쟁점들로 부각되었음을 확인하였다. 또한 대부분의 주요양전쟁점들은 시대별로 큰 차이를 보이는 것으로 밝혀졌다. 따라서 양전쟁점들이 시대별로 어떠한 변화패턴을 보였는지를 파악하기 위해서는 그 시대가 처한 상황들을 시스템적인 관점에서 이해하는 것이 필요하다.
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