가상화폐 시장의 인물 영향력에 대한 탐색적 연구 : 일론 머스크의 발언을 중심으로

홍가연,이상근,양창규 한국경영정보학회 2023 Information systems review Vol.25 No.3

본 연구는 가상화폐시장에서 인물 영향력을 확인하고자 한다. 즉, 영향력 있는 인물의 발언에 따른 가상화폐의 시장가격변화를 확인하여 인물 영향력의 존재유무와 영향력을 주는 발언을 확인하고 이에 대한 시사점을 제시하고자 한다. 이를 위해 가상화폐시장에서 전 세계적으로 유명한 일론 머스크의 가상화폐에 대한 발언시기에 따라 비트코인과 도지코인의 가격변화에 대한 분석을 실시한 후 비정상수익이 발행한 시점을 확인하였다. 분석결과에 따르면 (1) 부분별한 인물 영향력은 사라지고 있지만, (2) 가상화폐시장에서는 여전히 추측을 통한 투자가 이뤄지고 있으며, (3) 인물 영향력의 지속기간은 매우 짧고 직접적인 언급이 있는 경우 더 큰 영향력을 준다는 점을 확인할 수 있었다. 이 연구결과는 가상화폐시장이 건강하게 성장하기 위해서는 가상화폐에 대한 객관적인 평가체계 마련과 불량 가상화폐에 대한 구조조정이 필요하고, 정부주도의 디지털 화폐정책 입안 시 가상화폐를 참여시켜 합법적인 투명한 투자환경조성에 대한 노력이 필요하다는 점을 시사한다. The primary purpose of this study is to examine the influencer's impacts of cryptocurrency markets. By using Elon Musk’s twitter activity to compute effects of influencer's impacts in cryptocurrency markets, this study aims to analyze influencer's impacts and to offer implications for cryptocurrency markets. This study used the tweets that Elon Musk posted for the period between the April 1, 2019 to July 31, 2021 to conduct event study to evaluate influencer's impacts in cryptocurrency market. The results revealed that (1) influencer's impacts was disappearing, and (2) speculative investments was still made in the cryptocurrency market, (3) duration of the influencer's impacts was becoming short. The results indicate that objective evaluation system for cryptocurrency and sanction of bad cryptocurrencies should be needed, in order to ensure right cryptocurrency investment environment. On the other hand, the government should make policies to create the right cryptocurrency investment environment and flatform.

가상화폐시장의 구전효과에 대한 연구

홍가연,양창규 한국경영정보학회 2023 한국경영정보학회 학술대회논문집 Vol.2023 No.06

시간가중평균 모델을 이용한 대학생들의 공기오염물질 노출추정

홍가연,김순신,김동건,이석용,서승교,안호기,양원호 한국실내환경학회 2012 한국실내환경학회지 Vol.9 No.4

Information on time spent in microenvironments has a critical role in individuals’ exposure assessment. Time-activity studies have become an integral part of comprehensive exposure assessment and personal exposure modeling. The aims of this study were to estimate the exposure level of NO2, PM 10 and VOCs, and to compare the estimated exposure by using time-activity pattern and indoor air concentration. This study was performed upon 28 university students living in Daegu. We measured air pollutants of NO2, PM10 and VOCs at houses where the university students spent most their times. In this study, according to the summer and winter, time-activity patterns of university students were different. The 28 university students average spending times in house indoors and other indoors time were 11.52±2.14 and 7.63±2.65 hours in summer, and 14.78±3.30 and 6.59±3.03 hours in winter, respectively. The university students personal exposure NO2 concentrations were average 21.62±5.88 ppb and I/O ratio was 0.89±0.27. Personal average exposure of PM10 concentration was between house indoors and outdoors concentrations which indoor house concentration was 37.68±7.57 μg/m3 and outdoor house concentration was 43.85±9.80 μg/ m3 with 0.88±0.17 of I/O ratio. Personal exposure to benzene and the average concentration of benzene did not exceed in atmosphere environmental standard (annual 1.5 ppb) and the outdoor houses concentration was much higher than indoor houses.

필터 종류에 따른 호흡성 분진 농도 분석의 정전기 영향

홍가연 ( Ga Yeon Hong ),김진아 ( Jin A Kim ),우병열 ( Byung Lyul Woo ),김동건 ( Dong Keon Kim ),양원호 ( Won Ho Yang ) 대구가톨릭대학교 자연과학연구소 2011 자연과학연구논문집 Vol.9 No.1

Quality assurance for fine particle requires conditioning of filters at 20∼23℃ and 30∼40% relative humidity for 24hr prior to gravimetric analysis. The reason for these requirements is that the accuracy or reliability of filter weighting is associated with and can be affected by several factors including temperature, humidity, light, draft, and electrostatic charge. In this study, concentration of respirable suspended particulate by gravimetric method was measured in smoking room by three kinds of filters (PVC, MCE and PTFE) to quantify the effect of electrostatic charge. Among the filters, MCE filter was statistically affected by electrostatic charge (p= 0.002).

고엽제 노출에 따른 건강위해의 보건학적 고찰

양원호,홍가연,김근배,Yang, Won-Ho,Hong, Ga-Yeon,Kim, Geun-Bae 한국환경보건학회 2012 한국환경보건학회지 Vol.38 No.3

Objectives: Controversy regarding the relationship between exposure to Agent Orange and disease has progressed for more than four decades, both at home and abroad. Recently, the allegation by US veteran Steve House of the burial of Agent Orange at the US Army base Camp Carroll located in Waegwan-eup, Korea, has emerged. We reviewed published articles and reports related to Agent Orange. Methods: Articles and reports were collected online using the keywords 'agent orange' and 'health' and then reviewed. Results: A number of epidemiologic studies have reported disease outcomes due to exposure to Agent Orange, while others were unable to establish a link to the injuries of veterans of the Vietnam War. This can be explained by the fact that accurate exposure assessment should be carried out since exposure misclassification in epidemiologic studies can affect estimates of risk. In the case of the burial of Agent Orange at Camp Carroll, an exposure pathway could be through underground water supplies, which differs from the cases of Vietnam and Seveso in Italy. Conclusion: There still remains a dispute among academics regarding the relationship between exposure to Agent Orange and disease, although Agent Orange is a highly toxic chemical. This dispute indicates that accurate exposure pathway and exposure assessment is needed.

경북 일부지역 유흥 관련 실내환경에서 간접흡연 지표의 니코틴 농도 평가

김순신,홍가연,김동건,황소련,우병렬,안호기,양원호 한국실내환경학회 2012 한국실내환경학회지 Vol.9 No.1

xposure to environmental tobacco smoke (ETS) could adversely affect health. The aim of this study was to quantify the contribution of ETS exposure in nonsmokers of entertainment facilities. We simultaneously measured nicotine and nitrogen dioxide (NO₂), which are known as indicators of ETS, concentrations in indoor internet cafe, billiard, karaoke, bar and restaurant, and estimated exposure level of other harmful agents occurred from tobacco smoking. Mean nicotine concentration (10.57±2.53 ㎍/㎥) of internet cafe was the highest comparing to other facilities, whereas mean concentration of restaurant where was non-smoking area was 0.28±0.08 ㎍/㎥. There was statistically not correlated between NO₂and nicotine concentrations in entertainment facilities. Therefore, the use of NO₂ concentration as indicator of ETS exposure may not be available. To date, there are no standards about each agent occurred from ETS. Consequently administrative control and regulation, and further researches in relation to ETS exposure should be needed.

고엽제 노출에 따른 건강영향 고찰

김정혁,김재혁,홍가연,김동건,우병렬,양원호 대한보건협회 2011 대한보건협회 보건종합학술대회 Vol.2011 No.-

[연구배경] 고엽제(agent orange)란 베트남 전쟁당시 밀림 고사작전의 일환으로 베트남 정글에 뿌려진 제초제의 일종이다. 살포약제의 대부분(67%)을 점한 것이 고엽제이며 드럼통에 오렌지색의 페인트를 칠해서 다른 것과 구별한데서 그렇게 불리어졌다. 고엽제는 유기염소계 제초제인 2,4,5-T(트리클로로페녹시산)과 2,4-D를 1대1로 혼합한 것이다. 혼합비가 다른 약제에는 핑크, 그린, 디녹슬, 트리녹슬, 퍼플 등이 있다. 또한 고엽제는 제조시 불순물로 다이옥신(dioxin)이 포함되어 있으며, 고엽제 노출시 발암, 최기형성 등 치명적 건강영향을 야기할 수 있다. 그럼에도 몇몇 연구에서는 고엽제 노출에 따른 위해도(risk)는 없는 것으로 보고되고 있어, 그 동안 보고되었던 연구결과를 고찰하였다. [연구목적] 고엽제의 유해성(hazards)은 충분히 보고되고 있으나, 보고된 연구논문에 의하면 노출에 따른 위해도는 다르게 나타나고 있다. 이에 본 연구는 그 동안 연구 보고된 논문을 고찰하여 고엽제 노출에 따른 위해도를 평가 비교하고자 하였다. [연구방법] 국외 연구논문은 주로 Sciencedirect(www.sciencedirect.com)에서 주요 용어로 ``agent orange`` 및 ``exposure``로, 국내 연구논문은 DBPIA 등에서 ``고엽제`` 및 ``노출`` 등으로 조사하였다. 조사된 논문을 고찰하여 비교 분석하였다. [연구결과] 고엽제는 여러 가지 물질의 혼합물로서 이루어진 제초제이기 때문에 각각의 물질에 의한 건강 장애가 유발 될 수 있다. 흔히 고엽제에 불순물로 섞여진 다이옥신이 가장 심각한 독성을 유발하기 때문에 고엽제에 의한 건강장애는, 다이옥신에 의한 건강장애로 흔히 구분 없이 쓰이고 있다. 국가보훈처에서는 베트남전 참전과 고엽제 노출에 따른 후유증과 후유의증으로 구분하여 보상지원하고 있다. 다이옥신을 포함한 고엽제의 유해성은 충분히 인식되고 있으나, 몇몇 연구에서는 고엽제가 자연상태에서 분해 등으로 인간에게 직접적 노출 및 위해는 없는 것으로 보고되고 있다. 또한 일부 역학연구에서도 유의한 건강영향을 제시할 수 없다고 보고되고 있다. 반면 직접노출 및 생물농축에 의하여 치명적 건강영향을 보고하는 결과도 다양하게 보고되고 있다. 결론적으로, 치명적 독성을 가진 고엽제의 노출가능성을 고려할 때 보건학적으로 사전주의 원칙 (precautionary principle)을 제시할 수 있으며, 노출에 따른 건강영향을 충분히 고려해야 한다.

노출 시나리오를 이용한 대학생들의 유해 공기오염물질 노출 추정

김순신 ( Sun Shin Kim ),홍가연 ( Ga Yeon Hong ),김동건 ( Dong Keon Kim ),김성삼 ( Sung Sam Kim ),양원호 ( Won Ho Yang ) 한국환경과학회 2013 한국환경과학회지 Vol.22 No.1

Studies evaluating the health effects of hazardous air pollutants assume that people`s exposure to typical pollutant level is the same as specific regional pollutant level. However, depending on social and demographic factors, time-activity pattern of people can vary widely. Since most people live in indoor environments over 88% of the day, evaluating exposure to hazardous air pollutants is hard to characterize. Objective of this study was to estimate the exposure levels of university students of NO2, VOCs(BTEX) and PM10 using the scenarios with time-activity pattern and indoor concentrations. Using data from time-use survey of National Statistical Office in 2009, we investigated time-activity pattern of university students and hourly major action. A total of 1,057 university students on weekday and 640 on weekend spent their times at indoor house 13.04 hr(54.32%), other indoors 7.70 hr(32.06%), and transportation 2.36 hr(9.83%). Indoor environments in which university students spent their times were mainly house and school. Air pollutants concentrations of other indoor environments except house and school such as bar, internet cafe and billiard hall were higher than outdoors, indicating that indoor to outdoor ratios were above 1. According to three types of exposure scenarios, exposure to air pollutants could be reduced by going home after school.

대학가 주변 원룸의 라돈(radon) 농도 평가

이석용,이영무,박지현,김순신,홍가연,안호기,양원호,Lee, Seokyong,Lee, Youngmoo,Park, Jihyun,Kim, Sunshin,Hong, Gayeon,Ahn, Hogi,Yang, Wonho 한국환경보건학회 2013 한국환경보건학회지 Vol.39 No.2

Objective: Building materials can generate radon in indoor environments. This study aims to assess the radon concentrations of studio apartments around a university. Methods: 25 studio apartments around a University in Gyoungsan, Korea were measured for concentrations of radon. We evaluated the radon concentrations by using short-term continuous radon monitors at the studio apartments around the university, and analyzed the correlation between indoor radon concentration and factors affecting it, such as year of construction. Results: The average concentration of radon was 2.03 pCi/L(75.11 $Bq/m^3$)${\pm}1.34$ in the studio apartments. This radon level was lower than the radon standard for public use facilities in Korea and US EPA's standard of 4 pCi/L. However the measured radon levels were much higher than those previously reported in conventional dwellings. There was a statistically correlation between year of construction and radon concentrations in studio apartment buildings. Conclusion: It is suggested that recently built studio apartments might be constructed with phosphogypsum board that features higher radon emissions, and occupants are highly exposed to radon.

계절에 따른 사무실 근로자의 이산화질소 노출에 대한 직장 및 주택실내 기여도

양원호 ( Won Ho Yang ),김동건 ( Dong Keon Kim ),홍가연 ( Ga Yeon Hong ),김순신 ( Sun Shin Kim ),안호기 ( Ho Gi Ahn ) 한국산업위생학회 2012 한국산업보건학회지 Vol.22 No.2

People are exposed to air pollution from a range of indoor and outdoor sources. Concentration of nitrogen dioxide (NO2), which is hazardous to health, can be significant in both types of environment. This paper reports on the measurement and analysis of indoor and outdoor NO2 concentrations and their comparison with measured personal exposure in house and workplace indoors with 28 office workers during winter and summer seasons. Time activity patterns were used to determine the effects of these factors on personal exposure. The residential indoor and office indoor times were 12.29±1.58, 7.86±1.97 hours in winter and 11.04±2.18, 8.26±2.04 hours in summer, respectively. Measured residential indoor, outdoor and office indoor, personal exposure NO2 concentrations were 23.10±8.46 ppb, 23.97±6.86 ppb, 21.91±11.50 ppb, 22.08±8.64 ppb in winter, and 19.94±6.04 ppb, 21.21±6.84± ppb, 22.55±9.54 ppb, 27.45±8.96 ppb in summer, respectively. Contributions of residential and office indoor NO2 concentration on personal exposure were estimated by 57.98%, 35.62% in winter and 37.38%, 28.97% in summer, respectively.