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공유형 전동킥보드 어플리케이션 사용자 경험 개선에 관한 연구
김민주(Min-Joo Kim),손유경(Yu-Gyeong Son),박동건(Donggun Park) 한국디지털콘텐츠학회 2023 한국디지털콘텐츠학회논문지 Vol.24 No.7
The use of shared electric scooters have rapidly spread in real life, as a means of first- and last-mile transportation. However, there are increasing negative perceptions and a lack of research on their proper use and user experience. This study aimed to explore specific user experiences and examine the user requirements of shared electric scooter users. The mobile application for shared electric scooters can play a vital role in enhancing user experience and promoting responsible usage by facilitating services such as rentals, rides, and parking. Therefore, this study conducted scenario-based, one-on-one in-depth interviews to identify ways to improve the overall experience of using shared electric scooters at the mobile-application level, and derived inconveniences and expected improvements based on the Honeycomb model. The results of this study are expected to be utilized in the UX/UI design of shared electric scooter applications.
User centered gesture development for smart lighting
Donggun Park,Yu Shin Lee,Sejin Song,Ilsun Rhiu,Sanghyun Kwon,Yongdae An,Myung Hwan Yun 한국HCI학회 2016 한국HCI학회 학술대회 Vol.2016 No.1
The aim of this study is to investigate hand gesture expression and to understand it when controlling smart lighting system. The technology development has brought us the smart device which we can control multifunction of one or more systems. In order to fully utilize the functions, however, we need Natural User Interface (NUI) and intuitive control hand gesture. Therefore we conducted an experiment of hand gesture expression on 20 subjects to investigate and identify what kinds of hand gestures can be used to control the smart lighting system. The results identify categorization of hand gestures into three types. Also, differences between the gesture types were identified. In addition, the use of hand such as dominant hand and both hands affect the capability of people to express the hand gesture. This preliminary study can identify many important issues regarding hand gesture based interface for the smart lighting system. It can be further improved by verifications with consideration of context of use, preference test of hand, application of different devices or systems, and gesture evaluation.
SnO2 nanowire gas sensor operating at room temperature.
Park, Jae-Hwan,Cho, Mun-Seong,Lim, Donggun,Park, Jae-Gwan American Scientific Publishers 2014 Journal of Nanoscience and Nanotechnology Vol.14 No.10
<P>The NO2 gas sensor based on SnO2 semiconducting nanowires workable at room temperature has been investigated. The network structure of SnO2 nanowires was fabricated on the electrodes by a simple thermal evaporation process from Sn metal powders and oxygen gas. The diameter of the nanowires was 20-60 nm depending on the processing conditions. When the concentration of NO2 was 10 ppm, the sensitivity of 43, the response time of 38 s, and the recovery time of 25 s were observed at the operating temperature of 200 degrees C. In particular, the operating temperature of the sensor could be decreased down below 50 degrees C by controlling the properties of the nanowires and the structures of the electrodes. The sensitivities were 10-15 when the NO2 concentrations were 10-50 ppm at the operating temperature of 50 degrees C.</P>
Hyeongsik Park,Doyoung Kim,Eun-Chel Cho,Shahzada Qamar Hussain,Jeongeun Park,Donggun Lim,Sangho Kim,Subhajit Dutta,Mallem Kumar,Youngkuk Kim,Junsin Yi 한국물리학회 2020 Current Applied Physics Vol.20 No.1
In this study, we investigated the effect of plasma treatment on an indium tin oxide (ITO) film under an ambient Ar atmosphere. The sheet resistance of the plasma-treated ITO film at 250W (37.6 Ω/sq) was higher than that of the as-deposited ITO film (34 Ω/sq). Plasma treatment was found to decrease the ITO grain size to 21.81 nm, in comparison with the as-deposited ITO (25.49 nm), which resulted in a decrease in the Hall mobility. The work function of the Ar-plasma-treated ITO (WFITO=4.17 eV) was lower than that of the as-deposited ITO film (WFITO=5.13 eV). This lower work function was attributed to vacancies that formed in the indium and oxygen vacancies in the bonding structure. Rear-emitter silicon heterojunction (SHJ) solar cells fabricated using the plasma-treated ITO film exhibited an open circuit voltage (VOC) of 734 mV, compared to SHJ cells fabricated using the as-deposited ITO film, which showed a VOC of 704 mV. The increase in VOC could be explained by the decrease in the work function, which is related to the reduction in the barrier height between the ITO and a-Si:H (n) of the rear-emitter SHJ solar cells. Furthermore, the performance of the plasma-treated ITO film was verified, with the front surface field layers, using an AFORS-HET simulation. The current density (JSC) and VOC increased to 39.44 mA/cm2 and 736.8 mV, respectively, while maintaining a WFITO of 3.8 eV. Meanwhile, the efficiency was 22.9% at VOC=721.5 mV and JSC=38.55 mA/cm2 for WFITO=4.4 eV. However, an overall enhancement of 23.75% in the cell efficiency was achieved owing to the low work function value of the ITO film. Ar plasma treatment can be used in transparent conducting oxide applications to improve cell efficiency by controlling the barrier height.