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토픽 모델링을 활용한 전동킥보드 공유 서비스의 사용자 리뷰 분석
이정승 한국데이터전략학회 2024 Journal of information technology applications & m Vol.31 No.1
This study conducts topic modeling analysis on four electric scooter sharing platforms: Alpaca, SingSing, Kickgoing, and Beam. Using user review data, the study aims to identify key topics and issues associated with each platform, as well as uncover common themes across platforms. The analysis reveals that users primarily express concerns and preferences related to application usability, service mobility, and parking/accessibility. Additionally, each platform exhibits unique characteristics and challenges. Alpaca users generally appreciate convenience and enjoyment but express concerns about safety and service areas. SingSing faces issues with application functionality, while Kickgoing users encounter connectivity problems and device usability issues. Beam receives overall positive feedback, but users express dissatisfaction with application usability and parking. Based on these findings, scooter sharing service providers should focus on enhancing application features, stability, and expanding service coverage to meet user expectations and improve customer satisfaction. Furthermore, highlighting platform-specific strengths and providing tailored services can enhance competitiveness and foster continuous service growth and development.
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Mechanistic Roles of Pyridoxal 5`-Phosphate on Enhanced Osteointegration
이정승,김규리,이해신,조승우 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
For enhanced osteogenic support of blood-contacting medical device, hemo-compatibility is a crucial factor to induce fast and stable osteointegration in vivo. Here, we identified pyridoxal 5`-phosphate (PLP) from a library of phosphonic acid-containing molecules as a surface coating material and elucidated its roles on improved osteointegration. The surface-coated PLP greatly promoted hemophilicity of the implant and induced binding of plasma proteins by Schiff-base linkage, resulting in enhanced osteoblast adhesion and growth. PLP also increased platelet adhesion while delaying their activation and consequent blood coagulation. This allowed for sufficient supply of plasma proteins and migration of osteoblasts, which enhanced integration of the implant to surrounding bone tissues. Therefore, PLP would be a potential surface coating material of medical implants for enhanced tissue integration. <sup>**</sup>This study was supported by a grant (2016R1A5A1004694) from TRCP funded by the MSIP of Korea.
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조직의 의사소통 수준과 관리자의 안전분위기 및 공감이 산업재해 발생빈도에 미치는 영향
이정승,김수경,Lee, Jung Seung,Kim, Soo Kyung 한국데이터전략학회 2017 Journal of information technology applications & m Vol.24 No.2
Using a sample of 180 managers in small and medium sized organizations in Chungcheong and Southern Gyeonggi Province, we proposed that official communication channel on safety issue will influence managers' safety climate, empathy (safety climate), and eventually occupational accidents. The results supported our hypotheses, showing managers concern about their employees' safety issue when the organization officially emphasize on safety issue. At the same time, it also tells that managers are emphatic on their employees regarding occupational accidents when it comes to safety climate.
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공급망에서 구매업체의 지식, 원가, 정보공유 활동이 공급업체의 공유활동과 신뢰에 미치는 영향 : 신뢰의 매개효과를 중심으로
이정승,김명국,김수경,Lee, Jung Seung,Kim, Myung Kook,Kim, Soo Kyung 한국데이터전략학회 2017 Journal of information technology applications & m Vol.24 No.2
The aim of this study is to analyze the effect of the growing activities of large purchasing enterprises on the trust of small and medium size contractors, which is mediated by 'purchase accompany activity'. This subject study includes the first and second contractor companies in Korea. The results of this study are as follow. First, the knowledge and cost price sharing activities of major purchase vendor with cooperative company had a positive effect on the trust of cooperative company, however this was not so with the information sharing activities in that case. Second, the trust of contractors on large purchasing enterprises was positively influenced by sharing activities with purchasing activities of major company. Third, the knowledge and cost price sharing activities of purchasing enterprise with contractors on the sharing activities were mediated by the trust of contracting company on the large purchase enterprise. According to this study, the mediated effect of trust relationship can influence a contracting company. Whereas preceding studies of sharing activities were conducted about unidirectional instruct of large purchase enterprises to small and medium size contracting companies, this study was conducted on bidirectional effects, which included knowledge, cost price, information sharing activities between contracting companies and large purchasing enterprises. Conclusively, this study showed the possibility of spreading cognitive and change about mutual benefits strategy between small and medium size contracting company and large purchasing enterprise.
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