컨볼루션 신경망을 활용한 다중의도 뇌-컴퓨터 인터페이스

최우성,염홍기 제어·로봇·시스템학회 2023 제어·로봇·시스템학회 논문지 Vol.29 No.1

The Brain-computer interface (BCI) is a technology that measures and analyzes electroencephalogram (EEG) signals to control robots or machines according to the user's intention. The BCI is a beneficial technology that helps people who can not move their body because of paralysis or amputation so that they can control various electronic devices or express their intentions just by thinking. However, previous BCI technologies have a limitation that they can not have been unable to predict multiple intentions. To use the BCI system in daily life, BCI should be able to predict various intentions such as movement, communication, and robot control. In this study, we developed a BCI technology that can predict multiple intentions simultaneously using a convolutional neural network (CNN). We evaluated the proposed BCI model with EEG signals measured from 10 subjects participants during completing Sensory-Motor Rhythm (SMR) and Steady-State Visual Evoked Potential (SSVEP) tasks. The evaluation showed that the proposed BCI model could predict multiple intentions. The average accuracy averaged by all subjects was 62.8±13.7%. This result implies that BCI users can simultaneously perform various tasks, such as typing and moving. We expect that our study will promote the development of the practical applications of BCI. in daily life.

다양한 시간지연을 갖는 유전체 공진기 대역통과 필터의 구현

최우성,박노준,Choi, U-Sung,Park, Noh-Joon 한국정보통신학회 2010 한국정보통신학회논문지 Vol.14 No.11

Dielectric resonator bandpass filters with various time-delay at 800MHz were designed and fabricated in this paper. from the results of this study. first of all, good response. characteristics were measured for all cases. The insertion loss was below 2dB and flatness for ripple was below 0.2dB, whereas return loss was over 20dB, respectively. The measured delay time of the fabricated prototype were 6ns, 12ns and 200s, respectively and the flatness characteristics did not exceeding Ins for all cases. Furthermore, 2~4ns of flatness were measured for 2-hole dielectric block and other dielectric resonator filters with various delay time by combination of each prototypes filters were also implemented. 본 논문에서는 800MHz 대역에서 다양한 시간자연 특성을 갖는 유전체 공진기 대역통과 필터를 설계 및 제작하였다. 각각의 경우에 삽입손실은 모두 2dB 이내이었고 ripple은 0.2dB 이내이었으며 반사손실은 20dB 이상의 값을 가지는 우수한 특성을 보였다. 지연시간의 경우에는 각각 6ns, 12ns, 20ns를 구현하였으며 이때 평탄도의 범위는 1ns 이내이었다. 또한 유전체 블록이 2-hole을 갖는 경우에는 2~4ns의 범위를 갖는 것을 확인하였으며 각각의 유전체 필터를 조합하여 다양한 지연시간을 갖는 유전체 공진기 필터를 구현하였다.

GSM용 적층형 저역통과필터와 RF 다이오드 스위치의 설계

최우성,양성현,Choi, U-Sung,Yang, Sung-Hyun 한국정보통신학회 2012 한국정보통신학회논문지 Vol.16 No.3

Ansoft HFSS와 Serenade를 사용하여, 적층형 저역통과필터(LPF)와 RF 다이오드 스위치를 설계하였다. RF diode switch의 등가회로를 참고한 시뮬레이션은 송신모드 (Transmit mode)일 때 다이오드를 인덕터(Inductor)로 등가 회로화 하였고, 수신모드(Receive mode) 일때는 다이오드를 커패시터(Capacitor)로 변환하여 시뮬레이션 하였다. 적측형 RF diode 설계는 소자 와 수축률 변화를 고려하여 수행하였다. Using Ansoft HFSS(High Frequency Structure Simulator) and Serenade(circuit simulator), multilayer LPF and RF diode switch for GSM were designed. Diodes were transformed the inductor and capacitor in Tx and Rx for the simulation of equivalent circuit, respectively. In particular, the design of the simulation for multilayer RF diode switch was carried out with considering the variance of device and contraction percentage.

너치와 아이솔레이션을 활용한 CDMA와 W-CDMA 듀얼밴드용 유전체 듀플렉셔와 밴드패스 필터의 설계 및 제작

최우성,양성현,Choi, U-Sung,Yang, Sung-Hyun 한국정보통신학회 2011 한국정보통신학회논문지 Vol.15 No.6

너치와 아이솔레이션을 활용하여 제작한 CDMA와 WCDMA 듀얼밴드용 유전체 듀플렉셔와 밴드패스필터의 삽입손실과 이아솔레이션을 조사하였다. 측정한 최저 삽입손실과 분리도는 CDMA 밴드에서 -2.1708dB와 45dB, WCDMA 밴드에서 -2.6946dB와 100dB를 각각 보여주고 있다. 이러한 특성으로부터 제작된 듀플렉셔와 밴드패스 필터는 CDMA와 WCDMA 듀얼밴드에서 감쇠의 증가와 간섭을 감소시키는 역할을 할 것이다. Using the notch and isolation, we investigated the insertion loss and isolation characterics of the fabricated dielectric duplexers and bandpass filters for CDMA and W-CDMA dualband. Insertion loss(Tx band) and isolation(between Tx and Rx) of duplxer were about -2.1708dB and 45dB at CDMA band, respectively. Also, in the case of W-CDMA, the insertion loss(Tx band) and isolation(between Tx and Rx) showed about -2.6946 and 100dB, respectively. Summering the aboved results, fabricated the dielectric duplexers and bandpass filters will be contributed the increase of atttenuation and the decrease of interference at CDMA and W-CDMA dualband.

아이솔레이터를 장착한 Cellular와 DCS 밴드용 유전체 필터의 설계 및 제작

최우성,양성현,Choi, U-Sung,Yang, Sung-Hyun 한국정보통신학회 2011 한국정보통신학회논문지 Vol.15 No.6

셀룰라 수신(824~849 MHz)대역에서 삽입손실, 리플, 반사손실은 각각 -1.7093dB, 0.9162dB, -24.762dB를 보여준 반면, 송신(869~894 MHz)대역에서는 각각 -1.8021dB, 0.9615dB, -22.258dB를 나타내었다. 한편, DCS 수신(1710~1785 MHz)대역에서 삽입손실, 리플, 반사손실은 각각 -2.0149dB, 1.5163dB, -34.046dB를 확인할 수 있었으며, 송신(1805~1880 MHz)대역에서는 -1.5894dB, 2.3742dB, -33.058dB값을 각각 보여주었다. 특히, 밴드대역 엣지로부터 5MHz 떨어진 주파수에서의 감쇠는 셀룰라 수신 대역에서 -9.1399dB와 -14.336dB, 송신대역에서 -7.0343dB와 -5.2943dB를 각각 보였다. 상대 송신단으로부터 DCS 수신대역에서의 감쇠는 각각 -58.298dB와 -65.644dB를 나타낸 반면에, 상대 수신단으로부터 DCS 송신대역에서는 각각 -70.659dB와 -50.488dB를 각각 나타내었다. 위 결과로부터 아이솔레이터를 장착한 Cellular와 DCS 밴드용 유전체 필터는 좋은 스커트 특성과 평탄도를 보여줌을 확인하였다. Insertion loss, ripple, and return loss were -1.7093dB, 0.9162dB, and -24.762dB with Cellular Rx(824~849 MHz), -1.8021dB, 0.9615dB, and -22.258 with Tx(869~894 MHz), repectively. On the other hand, insertion loss, ripple, and return loss were -2.0149dB, 1.5163dB, and -34.046 dB with DCS Rx(1710~1785 MHz), -1.5894dB, 2.3742dB, and -33.058dB with Tx(1805~1880 MHz), respectively. In the particular, the attenuations in 5MHz edge of band width were -9.1399dB and -14.336dB with Cellular Rx, -7.0343dB and -5.2943dB with Cellualr Tx, respectively. The attenuations of DCS Rx from the relative Tx were -58.298dB and -65.644dB, respectively. On the other hand, those of DCS Tx from the relative Rx were -70.659dB and -50.488dB, respectively. From the aboved results, the dielectric filters for Celluar and DCS band with Isolator showed the good skirt and ripple characterics.

소셜 미디어 빅데이터 분석을 통한 복합리조트 인식에 관한 연구

최우성 한국관광산업학회 2019 Tourism Research Vol.44 No.4

본 연구에서는 빅데이터 분석을 통해 국민들이 복합리조트에 대한 인식이 어떠한지를 알아보고자 2018년 11월 26일부터 2019년 11월 26일까지 1년 동안 정보의 접근이 용이한 네이버와 다음에서 복합 리조트가 일반적인 의미로 어떻게 검색되고 있는지 알아보았다. 그리고 수집된 빅데이터를 활용하여 텍스트를 수집하고 정제, 분석, 시각화의 과정을 통해 정보를 도출하였다. 복합리조트 관련 주요 키워드 전체 네트워크를 분석한 결과 네트워크 중심에는 복합 리조트와 영종도로 나타났다. 또한 중심부의 주변위치에는 테마파크, 카지노, 리조트, 호텔 등이 존재하였다. 이것은 한국의 복합리조트는 숙박시설을 기반으로 한 테마파크와 카지노를 포함한 시설로 복합리조트를 인식하고 있다는 것이다. 다음으로 네트워크분석의 가장자리에는 가족, 객실, 여행, 바다, 펜션 등의 키워드가 위치하였다. 이것은 복합 리조트를 검색하는 고객들의 관심은 가족단위의 관광에 중심이 되고 있다는 것이다. 결론적으로 복합리조트에 대한 국민들의 인식은 인천을 중심으로 개발예정인 복합리조트에 대한 관심이 많은 것으로 나타났으며, 특히 복합리조트의 기능 중 카지노, 테마파크, 숙박시설 등 한국과 근접한 마카오나 필리핀 등의 복합리조트의 기능을 생각하는 것으로 나타났다. 이는 접근성이 뛰어나 많은 방문경험에 의한 것으로 볼 수 있을 것이다. 또한 현재 복합리조트가 내륙이 아닌 인천이나 제주도 등 바닷가에 위치하고 있어 복합리조트의 설립위치를 바닷가로 인식하고 있으며, 또한 가족 단위로 즐길 수 있는 체험위주의 시설로 인식하고 있는 것으로 볼 수 있다. 마지막으로 복합리조트가 고용창출 등 긍정적인 산업효과가 있는 것으로 인식하는 것으로 나타났다. 따라서 향후 복합리조트를 개발함에 있어 카지노, 테마파크, 마이스 등 복합리조트의 메인 기능중 하나를 설정하여 포지셔닝을 하여야 할 것이며, 특히 가족단위 관광객들이 즐길 수 있는 다양한 체험시설을 포함한 복합리조트로 개발하여야 할 것이다. This study observed how the general meanings of integrated resorts are searched for in Naver and Daum, which allow easy access to information, from November 26, 2018 to November 26, 2019 to observe how people perceive integrated resorts through big data analytics. Also, it collected texts using the collected big data and deduced information through a process of refinement, analysis, and visualization. Analysis of the full network of integrated resort-related major keywords showed that integrated resort and Yeongjongdo Island appeared in the center of the network. Also, theme park, casino, resort, and hotel existed in surrounding areas of the core. This means that the integrated resorts of Korea are perceived as facilities that include theme parks and casinos based on lodging facilities. Next, the keywords of family, room, trip, ocean, and pension were located at the edges of the network analysis. This shows that the interests of clients searching for integrated resorts are focused on family tourism. Conclusively, the perceptions of people regarding integrated resorts show a lot of interest in integrated resorts that are in the midst of development plans focusing on Incheon and in particular, when considering integrated resort functions, people thought of the functions of integrated resorts that are seen in Macao or the Philippines, which are close to Korea, such as casinos, theme parks, and lodging facilities. This can be seen to be because of frequent visiting experiences due to easy accessibility. Also, current integrated resorts are located not inland but by the ocean such as in places such as Incheon or Jejudo so the establishment locations of integrated resorts are perceived to be by the ocean and they are perceived as experience-focused facilities where families can have fun together. Lastly, integrated resorts are perceived to have positive industrial effects such as job creation. Therefore, the development of future integrated resorts should establish a main function such as a casino, theme park, or MICE, and work on positioning and in particular, they should be developed as integrated resorts that include diverse experience facilities that tourists can enjoy as family units.

연구호텔고객이 지각하는 상호작용품질이 관계결속과 관계지속의도에 미치는 영향 : 신뢰의 조절효과를 중심으로

최우성 한국관광산업학회 2012 Tourism Research Vol.35 No.-

This study have three purposes. The first is to examine the relationship between interactional quality and relational commitment. The second is to examine the relationship between relational commitment and intent to relationship continuity. The third is to examine the moderating effect of trust on the relationship between interactional quality and relational commitment. The major findings of the study are summarized as follows: First, results showed that interactional quality had significant influence on relational commitment. Second, results showed that relational commitment had significant influence on intent to relationship continuity. Third, the moderating effect of trust on the relationship between interactional quality and relational commitment had not influence. So trust is not moderator variables, but independent variables of intent to relationship continuity.

머신러닝 기반 고온 부품 열화 평가 프로그램 개발

최우성,장성호,이상민,강해수,방명환,배용채 대한기계학회 2020 大韓機械學會論文集A Vol.44 No.1

Replication is the most commonly used method in industry to assess the extent of damage and degradation of high temperature components. However, it is quite difficult to distinguish degradation levels because of the high level of uncertainty associated with the subject of the evaluator. Therefore, a more quantitative and accurate objective degradation evaluation method is necessary. In this paper, we propose a machine learning-based degradation evaluation program that evaluates the degradation grade of high temperature components using a support vector machine, which has excellent effect in classification problem among machine learning method. Also, open source image processing library is used. We verified the accuracy of the developed program by performing a degradation evaluation using image data of which the degradation grade was known. We demonstrate that the machine learning-based degradation evaluation program enables objective, quick and accurate deterioration evaluation a level that surpasses the capability of existing expert judgment. 표면 조직 복제법은 고온 부품의 손상 정도 및 열화 등급을 평가하기 위해 산업 현장에서 가장 많이 사용되는 방법이다. 그러나 평가자의 주관에 따른 불확실도가 높기 때문에 등급 간 명확한 구별이 불가하다. 따라서 보다 정량적이며 정확한 객관적인 열화 평가 방법이 필요하다. 본 논문에서는 오픈소스 이미지 처리 라이브러리와 머신러닝 기법 중 분류 문제에서 탁월한 효과를 보이는 SVM(Support Vector Machine)을 이용하여 고온 부품의 열화 등급을 평가하는 머신러닝 기반 고온 부품 열화 평가 프로그램을 소개한다. 열화 등급을 알고 있는 이미지 데이터를 활용한 열화 평가를 통해 개발된 프로그램의 유효성을 검증하였다. 머신러닝 기반 열화 평가 프로그램을 통해 기존 전문가의 판단보다 객관적이고 빠르면서 정확한 열화 평가가 가능할 것이다.

K-PCS와 W-CDMA 듀얼밴드용 유전체 듀플렉서와 밴드패스 필터의 설계 및 제작

최우성,양성현,김철주,문옥식,Choi, U-Sung,Yang, Sung-Hyun,Kim, Cheol-Ju,Moon, Ok-Sik 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.12

The K-PCS and W-CDMA dual band dielectric duplexer and bandpass filters have been designed and fabricated. The dual band duplexer consists of the separate monoblock K-PCS and W-CDMA duplexers using common antenna port. The coupling capacitance and I/O impedance matching have been designed to minimize the cross interference between the bands. Isolations of crosspoint between Tx and Rx in K-PCS and W-CDMA dualband were about 47 dB and 100 dB, respectively. On the other hand, isolations of Tx and Rx in K-PCS and W-CDMA were about 66 dB and 65 dB, respectively. The difference between 47 dB and 100 dB originated from the different center frequencies in Tx and Rx of K-PCS and W-CDMA bands. The coupling capacitance of the bandwidth, I/O capacitance of I/O matching and impedance matching, and various capacitances were important role to fabricate the dielectric duplexer and bandpass filters.

카지노 영업직이 지각하는 일터학습이 조직몰입에 미치는 영향에 있어 직무만족의 매개효과와 상사신뢰의 조절효과에 관한 연구

최우성 관광경영학회 2019 관광경영연구 Vol.91 No.-

The purpose of this study was to determine the mediating effects of job satisfaction and moderating effects of trust in supervisor on the relationship between workplace learning and organizational commitment in casino employee. The major finding of this study were as follows: First, the higher the perception of workplace learning, the higher organizational commitment. Second, job satisfaction had a partially mediating effect on workplace learning and organizational commitment. Third, as the result of verifying the moderating effect of trust in supervisor in the relationship between workplace learning and organizational commitment, it was found that trust in supervisor did not effect of moderator. The study illuminates discussion that company should not only support workplace learning but also improve work environment, organization culture, and so on. Moreover, according to creating collaborative learning culture based on trust in organization, workplace learning will be expressed effectively to organizational commitment and organization should support employees’ voluntary and continuous learning.