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Effect of Background Music for Attentive Concentration in Working
Sihun Park,Chanbeom Kwak,Woojae Han 한국청각언어재활학회 2020 Audiology and Speech Research Vol.16 No.3
Purpose: Recently, many young people have preferred to work in café than traditional library because the café is equipped with coffee, music, and cozy seats. When working in the café, whether listeners’ attentive concentration could be affected by a kind of the background music needs to be investigated as the purpose of the present study. We also aimed to confirm the attentive concentration of listeners might be caused by their music inclination. Methods: A total of ninety young adults was randomly assigned as five kinds of background music [e.g., rhythm and blues (R&B)/ballad, dance/rock, classic/jazz, fast beats, slow beats] and no music after responding to simple questions to ask their preference of music genre. While listening to the music, the subjects took an attentive concentration test, namely Frankfurter aufmerksamkeits-inventar (FAIR). The obtained data were analyzed by three subcategories of the FAIR test which consists of performance, quality, and continuity. Results: For the music genre, classic/jazz showed significantly higher continuity scores than R&B/ballad, fast beats, and no music, which means that classic/jazz music of the café could help the workers maintain the attention. In the subgroup who listened to preferred music genre, their performance scores (i.e., selective attention) was significantly higher than that of the participants who being exposed to non-preferred music. Conclusion: Current results supports that music genre and individual music inclination may partially affect listener’s ability of the attentive concentration when background music was presented in the café, although a further study to find certain possible causal factors with objective methods should be followed.
Park, Jin Han,Hwang, Jongchul,Kim, Juhyung,Park, Byeongmuk,Park, Juyoung,Son, Jeongwoo,Lee, Sihun Eudoxus Press LLC 2016 Journal of computational analysis and applications Vol.20 No.5
<P>This paper presents new methods for measuring similarity between generalized intuitionistic fuzzy sets (GIFSs) and its application to pattern recognition. Firstly, the geometrical interpretation of GIFSs is carefully reviewed and then the results of the interpretation is utilized to generate new methods for measuring similarity in order to calculate the degree of similarity between GIFSs. Numerical example is given to illustrate the application of the proposed similarity measures. Finally, we also use the proposed similarity measures to characterize the similarity between linguistic-variables.</P>
Analysis for Error Patterns of Consonant-Vowel Combinations in Hearing-Impaired Elderly
Sihun Park,Woojae Han 한국청각언어재활학회 2020 Audiology and Speech Research Vol.16 No.3
Purpose: Many previous studies related to speech recognition of hearing-impaired elderly have found that the elderly have difficulty in monosyllable recognition under noisy situations, but there is still lack of their specific information to perceive the monosyllables in terms of error pattern. The purpose of the present study was to measure and analyze the prominent errors of consonant (C)- vowel (V) combinations as a function of noise levels in the hearing-impaired elderly. Methods: A total of twenty older adults with sensorineural hearing loss participated. While randomly presenting 122 syllables which consisted of the Korean CV and VC combinations under quiet and two signalto- noise ratios (SNRs, +6 and +3 dB) conditions, the participants were asked to respond the syllables heard in a way of either discrimination or identification. Error rate (or percent incorrect) and error patterns of the syllables were analyzed in each condition. Results: Substitution error of the initial consonant showed the highest rate regardless of the background conditions. As the medial phoneme, the vowel errors were decreased as the level of noise increased. In the final consonant, additional error rate of /k/ was abruptly increased as SNR decreased. Furthermore, it was an interesting pattern that the initial consonants such as /s/, /l/, and /t*/ had a high substitution error rate when combined with /i/, /o/, and /ɛ/ vowels, respectively. Conclusion: Based on the current results, the hearing-impaired older adults seem to have their unique error patterns although there is individual difference. We expect that these results will be fundamental data to understand characteristics of speech perception in the older adults at the monosyllables level.
지열원 및 수열원 비율에 따른 복합열원 히트펌프시스템 성능 평가 연구
박시훈(Sihun Park),고유진(Yujin Ko),민준기(Joonki Min) 한국지열·수열에너지학회 2021 한국지열에너지학회논문집 Vol.17 No.2
In this study, combined heat source heat pump system was implemented with 4 single heat source heat pumps each applied with a geothermal source and a water source. Five cases (Case1~Case5) were configured to conduct a performance comparison and analysis of the combined heat source heat pump system. First of all, as a result of analyzing the heat source, the case when 4 ground heat sources were applied (Case1) showed a uniform EST(Entering Source Temperature) distribution throughout the year since it is less affected by outside air compared to the case when 4 water heat sources were applied (Case5). In both winter and summer, the ground heat source maintained higher EST than the water heat source. Therefore, the system with high ratio of geothermal sources is advantageous for heating, and with high ratio of water heat sources is advantageous for cooling.
스마트팜에서 지열원과 수열원으로 구성된 복합열원 히트펌프 시스템의 에너지 성능 평가 연구
박시훈(Sihun Park),한혜린(Hyerin Han),홍희기(Hiki Hong),민준기(Joonki Min) 대한설비공학회 2021 설비공학 논문집 Vol.33 No.11
This study conducted an energy performance evaluation by applying a composite heat source heat pump system to artificial light-type smart farms, simulating a total of five cases (Cases 1 to Case 5) including a heat pump system with Ground heat source and Water heat source, respectively. In Case 2, the average COP in May for cooling was 5.23 and the energy consumption was 19.69 MWh. This resulted in a 9.75% lower COP compared to Case 4 and a 9.14% higher energy requirement. In Case 2, the average December COP for heating was 2.37 and the monthly average minimum energy consumption was 34.66 MWh. This resulted in a 4.22% higher COP compared to Case 4 and a 4.52% lower energy requirement. Artificial light-type smart farms require cooling even in winter due to lighting loads. Underground temperature rises due to their relatively high cooling loads compared to heating loads. Therefore, it is necessary to construct a system in a way that can suppress the increase in underground temperature.