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Sound visualization of smartphone-radiated noise using nearfield acoustic holography
Taeyoung Park,Seonghun Im,Dong-Hyun Kim,Sangbeom Woo,Inman Jang,Won-Suk Ohm,Heungkil Park,Sehun Park,Guwon Ji 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.8
A smartphone contains electronic components that can inadvertently act as sources of unwanted vibration and noise. Also known as the "buzz," the noise is produced primarily by multilayer ceramic capacitors, the piezoelectric pulsation of which drives the circuit board into vibration, hence sound radiation. Given the close proximity of the smartphone to the ear, the audible noise, albeit low in amplitude, can be a nuisance and degrade the call quality. Thus accurate measurement and analysis of the noise are needed as the first step toward resolving the problem. The popular farfield-based techniques, however, are not applicable to smartphone-radiated noise because of its low sound pressure level (~20 dB). This paper presents an alternative method based on nearfield acoustic holography (NAH), here tailored for a small mobile device radiating low-intensity noise. The NAH method is shown to be capable of visualizing sound pressure and intensity anywhere near the smartphone as well as the vibration of the circuit board, which could lead to an effective design strategy for a quieter smartphone.
Taeyoung Kim,Eonjoo Park,Jun Suk Eun,Eun-young Lee,Ji Won Mun,Yunsang Choi,Shinyoung Lee,Hansol Yeom,Eunkyoung Kim,Jongmu Kim,Jihyun Choi,Jinho Ha,Sookkyung Park 한국역학회 2023 Epidemiology and Health Vol.45 No.-
OBJECTIVES: As few mpox cases have been reported in Korea, we aimed to identify the characteristics of mpox infection by describing our epidemiologic investigation of a woman patient (index patient, the third case in Korea) and a physician who was infected by a needlestick injury (the fourth case). METHODS: We conducted contact tracing and exposure risk evaluation through interviews with these 2 patients and their physicians and contacts, as well as field investigations at each facility visited by the patients during their symptomatic periods. We then classified contacts into 3 levels according to their exposure risk and managed them to minimize further transmission by recommending quarantine and vaccination for post-exposure prophylaxis and monitoring their symptoms. RESULTS: The index patient had sexual contact with a man foreigner during a trip to Dubai, which was considered the probable route of transmission. In total, 27 healthcare-associated contacts across 7 healthcare facilities and 9 community contacts were identified. These contacts were classified into high (7 contacts), medium (9 contacts), and low (20 contacts) exposure risk groups. One high-risk contact was identified as a secondary patient: a physician who was injured while collecting specimens from the index patient. CONCLUSIONS: The index patient visited several medical facilities due to progressive symptoms prior to isolation. Although the 2022 mpox epidemic mainly affected young men, especially men who have sex with men, physicians should also consider mpox transmission in the general population for the timely detection of mpox-infected patients.
Dong-Won Lee,Taeyoung Kang,Do-Hyung Park 한국경영정보학회 2014 한국경영정보학회 학술대회논문집 Vol.2014 No.1
정보기술의 발전과 혁신은 우리들의 일상 생활에 여러 변화를 가져오고 있다. 그 중에서도 스마트 기기의 도입과 확산은 기존의 통신을 위한 기기로서의 역할을 넘어, 정보검색 활동이나 취미, 쇼핑 등의 여가 생활, 쇼핑 등에도 큰 영향을 주고 있다. 본 연구에서는 소비자가 온라인으로 구매하는 과정에서, 온라인 쇼핑과 모바일 쇼핑의 소비자 행태 차이를 비교 분석하고자 한다. 일반적인 소비자의 구매 단계인 문제인식, 점보탐색, 대안도출, 구매, 구매 후 활동 등의 다섯 가지 단계 각각에서 온라인 쇼핑의 행태와 모바일 쇼핑의 행태를 비교하고자 한다. 대한민국의 선도 온라인 쇼핑몰의 실증 데이터를 기반으로, 각 단계에서 어떤 채널 (모바일 기기 vs. PC) 을 통한 활동이 더 활발히 수행되고, 선호되는지를 과업 기술 적합 이론을 근거로 하여 가설화 시키고, 이를 실증적으로 밝혀 온라인 쇼핑몰 운영에 대한 이론적 실무적 시사점을 도출하고자 한다.
채태영(Taeyoung Chae),이재욱(Jaewook Lee),조가람(Garam Jo),류창국(Changkook Ryu),강기섭(Kieseop Kang),양원(Won Yang) 한국연소학회 2013 KOSCOSYMPOSIUM논문집 Vol.2013 No.12
An experimental study was performed in a 60 kWth down-fired furnace to investigate characteristics of syngas reburning in combustion systems which use LNG and coal as a main fuel, reburn fuels used were CH4, CO, and H2. Measurements of local mean 02, CO, CO2, and NOx concentrations, and gas temperatures have been performed in the furnace for various conditions: species of the reburn fuels and stoichiometic ratio in the reburn zone. The reburning ratio tested for gas fuels was ranged from 5% to 20%, and 10% coal based on. In the result, maximum NOx reduction was 52.4% for LNG and 33.4% for coal. CH4 was observed to have the most significant effect to reduce NOx for both LNG and coal case. Additionally, NOx was observed to be more reduced for lower stoichimetric ratio in the reburn zone; i.e. higher reburn ratio.
Edge Charge Singularity of Conductors
황치옥,Taeyoung WON 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.3
In this paper, we investigate a diusion-based simulation method for the edge singularity of a conducting object, rapidly evaluating the power-law singularity associated with the edge of the conducting object for the computation of capacitance coecients for VLSI interconnection systems. We show that for the edge singularity of a conducting object the edge distribution in the last-passage method can be approximated to be proportional to the potential dierence at a point very near to the conducting object from the potential of the conducting object. One exemplary application of this method to the cube edge is in good agreement with the previous result.
죽탄 및 죽초액 제조를 위한 인도네시아산 및 국내산 대나무의 탄화특성 비교 연구
양원(Won Yang),김희열(Hui Yeol Kim),채태영(Taeyoung Chae),K. Ibik,H.G. Pohan 한국연소학회 2010 한국연소학회지 Vol.15 No.1
Carbonization characteristics of Indonesian bamboos were investigated using lab-scale tube furnace, in order to find optimum design temperature of a carbonizer for producing bamboo charcoal and vinegar. The bamboo samples used in this study are local bamboos from Damyang in Korea, Andong and Petung in Indonesia. Correlation of electric resistance, specific surface area and pH of bamboo vinegar with pyrolysis temperature has been investigated. Electric resistance of the charcoal increased for higher pyrolysis temperature the specific surface area was also increased as carbonization temperature got higher. Charcoal which has specific surface area of over 300 ㎡/g could be produced at 700℃. pH of bamboo vinegar was decreased for highter carbonization temperature and vinegar under pH 3 could be produced for all bamboo samples. In this experimental condition, it was found that lower carbonization temperature is better for producing bamboo vinegar of high quality, while higher temperature is better for obtaining bamboo charcoal with larger surface.