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CVM을 이용한 프로스포츠 리그의 공공재적 가치 추정: COVID-19 상황을 중심으로
차재혁 ( Cha¸ Jaehyuk ) 한국체육학회 2021 한국체육학회지 Vol.60 No.2
본 연구는 COVID-19 상황에서 프로스포츠 리그가 우리 사회에 창출하는 비시장적 가치, 그중에서도 공공재적 가치를 중심에 두고 경제적 가치 평가를 수행하였으며, 조건부가치평가법(CVM)을 분석 기법으로 활용하였다. 온라인을 통해 총 1,000부의 설문지가 배포되었으며, 불성실 응답과 저항성 응답을 제외한 총 800부를 최종유효표본으로 활용하여 분석하였다. 로그-로지스틱모형과 토빗 모형을 통해 폐쇄형과 개방형 응답 결과 모두를 제시함으로써 연구결과의 신뢰성과 타당성을 확보하고자 하였다. 분석 결과, 프로스포츠 리그에 대한 1인당 WTP는 DBDC 모형에서 5,590.5원, Tobit 모형에서 6,634.3원으로 추정되었다. 이를 다시 사용가치와 비사용가치로 분해하였으며, DBDC 모형에서 1,414.4원과 1,678.5원, Tobit 모형에서 4,176.1원과 4,955.8원으로 각각 추정되었다. 특히, 비사용가치가 사용가치에 약 3배에 달하는 것으로 나타나 한국의 프로스포츠 리그는 NHL, NFL, NBA 등 해외 리그 구단에 상대적으로 더 높은 공공재적 가치를 갖는 것을 확인하였다. 이상의 결과를 토대로 학술적, 실무적 시사점을 논의하였다. This study evaluated the economic value of professional sports leagues, focusing on the public goods as non-market goods value created in Korean society using the contingent valuation method (CVM). A total of 1000 questionnaires were distributed by the online web site, and a total of 800 data, excluding unfaithful responses and protest responses, were used as final valid samples for analysis. In this study, we tried to secure the reliability and validity of the study results by presenting the results of closed and open responses simultaneously through log logistic model and Tobit model. As a result of the analysis, the WTP per capita for the professional sports league was estimated 5,590.5 won in the DBDC model and 6,634.3 won in the Tobit model. These were decomposed into use and non-use value, an estimated 1,414.4 won and 1,678.5 won in the DBDC model, and 4,176.1 won and 4,955.8 won in the Tobit model. In particular, it was found that the non-use value reached about three times the value in use, confirming that Korean professional sports leagues have a relatively higher public property value to overseas league teams such as the NHL, NFL, and NBA. Based on the results, implications for sport industry and academia were discussed.
Input Balun Embedded Low-Noise Amplifier With a Differential Structure
Jaehyuk Yoon,Changkun Park IEEE 2014 IEEE microwave and wireless components letters Vol.24 No.6
<P>In this study, we designed a 5 GHz low-noise amplifier (LNA) with a differential structure using 0.18 μm RFCMOS technology. An input balun is embedded into the LNA to enhance the gain, minimize the noise figure (NF), and miniaturize the overall chip size. The NF is minimized because the loss induced by the passive balun is removed. The first stage of the designed LNA performs the activities of the input balun and serves as the gain stage. To verify the feasibility of the proposed input-balun-embedded amplifier, we designed a typical LNA and the proposed LNA. We obtained a 29.4 dB gain with a NF of 1.85 dB. The measured dc power consumption is approximately 27 mW. The chip size is 1.0×0.74 mm<SUP>2</SUP>. From the measured results of the typical and proposed LNAs, we successfully prove the feasibility of the proposed method to minimize the NF and enhance the gain.</P>
Jaehyuk Lee 대한스포츠물리치료학회 2022 정형스포츠물리치료학회지 Vol.18 No.1
Purpose: This study aimed to provide basic data for a educational curriculum to train as professional healthecare instructors by investigating satisfaction of student, enrolled in sports rehabilitation and adapted physcial education department of the university in conjunction with educational goals Methods: This study conducted a survey of 64 students enrolled in the university in Gyeonggi-do. All participants consisted of 14 first graders (21.9%), 16 second graders (25%), 19 third graders (29.7%), and 15 fourth graders (23.4%). The survey was conducted using a Likert 5-point questionnaire, consisted of 12 questions related to “satisfaction with major curriculum”, 2 questions related to “connection and achievement with university competencies”, and 4 questions related to “career preparation and curriculum improvement”. Descriptive statistics, frequency analysis, wordcloud was used in the analysis. Results: As a result, they generally satisfied with the current major curriculum, but the demand for field-friendly curriculum was relatively high, and it was also found that there was a high demand for curriculum related to certificate acquisition. Conclusion: In conclusion, university students enrolled in the department of sports rehabilitation or adapted physical education had high demands for field-friendly learning, curriculum related to certificate acquisition, and advices to broaden the insight into their careers. Therefore, it is expected to use these results for improving the curriculum of sports rehabilitation and adapted physical education departments in the future.
Jaehyuk Kim,Dong Hwan Kim,Sangchul Lee,Donghwan Kim,Sang Hyub Lee,Dalhyun Do,Jeongmin Kim 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.2
Commercially used Nd-Fe-B sintered permanent magnets have been widely used in various applications such as hard disc drives, wind power generators, efficient air-conditioner compressors and motors for electric vehicles. Since these applications are often used in high-temprature environments, the required coercivity and remanence have been simultaneously obtained by using the heavy rare earth (HRE) grain boundary diffusion process (GBDP). In this study, we report the heat treatment temperature dependence of magnetic properties as a start to reduce the HRE content of GBDP-based high performance magnets. TbH coated commercial Nd-Fe-B sintered magnets were annealed under various temperatures and the coercivity and remanence were systematically measured. Further description of the microstructure will be discussed in detail.
A CMOS LNA Using a Harmonic Rejection Technique to Enhance Its Linearity
Jaehyuk Yoon,Changkun Park IEEE 2014 IEEE microwave and wireless components letters Vol.24 No.9
<P>In this study, we design a differential low-noise amplifier (LNA) using a 0.18- μm RF CMOS process. To improve its linearity, we propose a harmonic rejection technique using RC feedback at the gain stage. The third harmonic component of the drain node of the common-gate transistor is fed back to the source node of the common-gate transistor to restrict the generation of the third harmonic component at the output of the LNA. To verify the feasibility of the proposed technique for a linear amplifier, we designed a typical LNA and the proposed LNA in an identical process and with the same design parameters apart from the feedback loop of the proposed LNA. The measured improvement of the input-referred P1 dB of the proposed LNA is approximately 3 dB compared to that of the typical LNA. From these measured results, we successfully prove the feasibility of the proposed linearization technique.</P>