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비 계층적 클러스터링 알고리즘 기반 저조도 상태 가시광 통신 시스템
황호연(Hoyeon Hwang),이원창(Won Chang Lee),강근택(Geuntaek Kang) 한국정보기술학회 2018 한국정보기술학회논문지 Vol.16 No.6
In this paper, we propose a modulation/demodulation scheme of visible light communication(VLC) based on a non-hierarchical clustering algorithm under a low light condition. The modulation scheme is PAM&PPM scheme which combines pulse amplitude modulation(PAM) with pulse positions modulation(PPM), so we can transmit n-bits in a single signal. The receiver demodulates the received signal based on a k-means clustering algorithm which is one of the non-hierarchical clustering algorithms. The system is implemented assuming single-input single-output and the transmitter can transmit 2 bits of data in one signal using the proposed scheme, The modulated signal is transmitted through the LED of the transmitter. The signal received by the receivers photodiode is demodulated by the microprocessor. In the experiment, the data of the demodulated signal were compared with the data of the transmission signal to confirm the bit error rate of about 0.016%. under the dimming rate of 1%.
황호연(Hoyeon Hwang),전정민(Jeongmin Jeon),정홍렬(Hong-ryul Jung),김수종(Sujoing Kim),문형필(Hyungpil Moon) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.11
Task planning and motion planning are needed to handle the task the robot wants. The task planning is represented by a graph structure map of vertices and edges. At the vertex, the robot manipulator information, position, and object’s position were shown, and the edge represented the behavior of the robot, which was represented by a graph structure. With information about objects in the graph structure, geometric constraints can be considered in task planning. The heuristic can be used in the graph search algorithm to find the optimal path for task planning. Motion planning and v-rep simulator allow you to see the results of task planning.
이영종(Youngjong Lee),황호연(Hoyeon Hwang),박경오(Kyungho Park),홍유표(Youpyo Hong) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.10
디지털 영상에 대한 위/변조 방지 및 저작권 보호를 위한 다양한 워터마킹 기법이 연구되어 왔다. 워터마킹 기법은 그 응용 대상에 따라 알고리즘이나 구현 방식이 크게 달라지게 되는데, 본 연구에서는 디지털 콘텐츠 대부분이 압축되어 전송, 저장되는 추세와, 최근 대부분의 멀티미디어 동영상 코덱 표준으로 채택이 되고 있는 H.264/AVC 인코더를 기반으로 한 워터마크 삽입을 실시간으로 수행하기 위한 기법을 제시한다.
스마트스피커의 보이스와 외형 개성이 사용자 만족도에 미치는 영향
김헌(Huhn Kim),고재영(Jaeyeong Ko),김승완(Seungwan Kim),황호연(Hoyeon Hwang) 대한인간공학회 2019 大韓人間工學會誌 Vol.38 No.6
Objective: The aim of this study is to investigate the voice and appearance personality of representative smart speakers in Korea through emotional vocabularies, and is to identify the factors affecting the personal satisfaction of smart speakers. Background: Recently, various kinds of smart speakers have been spreading. Such smart speakers have various appearances and voices, and conversational interactions have their own personalities. However, the study on what kind of personality users prefer is still insufficient. In addition, it is difficult to find out whether the congruence between design and voice personality affects user satisfaction. Method: In this study, the voice and appearance personality of four smart speakers sold in Korea were separately evaluated using seven emotional vocabularies: funnyserious, casual-formal, respectful-irreverent, enthusiastic-matter of fact, warm-cold, talkative-silent, active-inactive. Then, the satisfaction of each speaker was evaluated. Results: In the evaluation results of the emotional vocabularies on voice and appearance personality, there were significant differences between the four smart speakers. In addition, there were significant differences in the satisfaction of the four types of smart speakers. In particular, some smart speakers have shown a very large gap between voice and appearance personality. Conclusion: The participants preferred a polite, friendly, and warm voice. On the other hand, too serious, formal and cynical voices could have a negative impact on satisfaction. Meanwhile, the congruence between voice and appearance does not have a big impact on user satisfaction. Application: The results of this study can be used to design the personality of smart speakers.
서희정(Heejeong Seo),민경우(Kyoungwoo Min),박지영(Jiyoung Park),박주현(Juhyun Park),황호연(Hoyeon Hwang),박세일(Seil Park),김선정(Seonjeong Kim),정숙경(Sukkyung Jeong),배석진(Seokjin Bae),김성준(Seongjun Kim) 한국환경보건학회 2022 한국환경보건학회지 Vol.48 No.2
Background: As high concentrations of uranium and radon have been detected in some areas in Korea, it is considered necessary to investigate natural radioactive materials in the Gwangju area. Objectives: This study aimed to identify the hydrochemical characteristics of groundwater in Gwangju and investigate the distribution characteristics of uranium and radon, which are naturally radioactive substances. Methods: To determine the uranium and radon concentrations in groundwater according to the geology of the Gwangju area, we measured 62 groundwater wells. A geological distribution map of uranium and radon content was prepared for this study. Results: The groundwater type, defined using a Piper diagram, was mainly Ca-HCO3. The concentration of uranium in the groundwater ranged from 0 to 29.3 µg/L, with a mean of 3.3 µg/L and a median of 0.9 µg/L. The median concentration of uranium in groundwater was highest in alluvium, granitic gneiss, and biotite granite (classified by geological unit), in that order. The concentration of radon in the groundwater ranged from 4.8 to 313.2 Bq/L, with a mean of 75.6 Bq/L and a median of 59.6 Bq/L. The median concentration of radon in groundwater was highest in biotite granite, alluvium, and granitic gneiss, in that order. As a result of the correlation analysis of groundwater in the study area, there was no significant correlation between uranium and radon. Conclusions: In this study area, uranium was shown to be far below the concentrations allowed by drinking water quality standards, but radon concentrations exceeded drinking water quality monitoring standards in 11% of the samples. It was judged that appropriate measures, such as the installation of radon reduction facilities, will be required after a thorough review of high-concentration radon detection sites of in the research area.