• 한국자연치유학회지
• /
• 제10권2호
• /
• pp.93-107
• /
• 2021

배경: 헤어 미용인들의 코로나감염증에 대한 위생과 인식에 대한 조사의 필요성이 대두되었다. 목적: 헤어 미용인들의 COVID-19에 대한 보건위생 관심 정도와 인식 정도를 조사하였다. 방법: 대전광역시 소재 헤어 미용인을 대상으로 설문 조사하였다. 회수한 설문지 총 260부를 SPSS 26.0 프로그램을 분석하였다. 결과: 미용인들의 보건위생 관심도는 연령, 학력, 직급, 미용실의 형태, 근속연수에 따라서 통계적으로 유의한 차이를 보였다. 코로나-19에 대한 인식 정도에서 코로나의 위험성에 대해서는 30대 이상, 원장, 중간크기 가게, 근속연수 10년 이상에서 높게 나타났다. 코로나에 대한 낙관적 측면에서는 20대, 보조 스텝, 대형가게 및 근속연수 5년 미만에서 높게 나타났다. 보건위생 관심, 위생 관심도, 손 위생 및 마스크 위생, 코로나 위험성 인식과 낙관적 인식은 정(+)의 상관관계가 있었다. 결론: 대전지역 헤어미용인들에 대한 보건위생 관심과 인식 정도는 연령, 학력, 직급, 헤어샵의 형태 및 근속연수에 따라서 유의하게 증가하였다. 본 결과는 이 분야의 연구에 기초자료가 되리라 평가한다.

• 한국항만경제학회지
• /
• 제39권1호
• /
• pp.1-16
• /
• 2023

여수항은 화물기능이 광양항으로의 이전 완료됨에 따라 우리나라의 해양관광 거점 항만으로 거듭하는 비전을 수립하였으며, 크루즈육성을 통한 해양관광 산업 활성화가 주요 전략으로 인식되고 있다. 국내 주요 크루즈 관광 항만(부산항, 제주항, 인천항)은 2016년 수립된 '제1차 크루즈산업 육성 기본계획'에 부응하여 항만 크루즈 육성 기본계획을 수립하여 적극적으로 추진하고 있는 반면에 여수항은 크루즈 육성에 관한 계획 수립이 미흡한 상황이다. 코로나-19로 인해 침체기에 처해 있는 크루즈 관광업은 위드 코로나 및 포스트 코로나에 따라 회복될 것으로 예상되며, 여수항은 이에 대비하기 위한 크루즈산업 활성화를 선두로 추진할 필요가 있다. 이에 본 연구는 선행연구와 전문가 의견 수렴을 통해 여수항 크루즈산업 육성에 대한 평가항목을 도출하고 IPA(Importance Performance Analysis) 기법을 활용하여 여수항 크루즈산업에 관한 문제점 파악과 육성 방안을 제시하고자 한다. IPA 분석결과에 따르면 대분류 항목 중에는 크루즈 인프라 조성과 지원 체계 구축이 약점항목(중요도가 높으나 만족도가 낮은 항목)으로 평가되었으며, 두 대분류에 해당하는 소분류 항목(크루즈 선석 확장에 따른 운영 계획 수립, 연안/엑스포터미널 시설 개선 또는 크루즈터미널 신축, 전담조직 신설 및 담당인력 확보 외 4개)이 약점항목으로 도출되었다. 이러한 분석결과를 토대로 여수항 크루즈산업 육성 방안을 크루즈 인프라 조성, 노선확대 및 관광상품 개발, 지원체계 마련 등으로 제시하였다. 본 연구는 여수항이 크루즈산업의 육성, 나아가 한국 해양관광 거점 역할을 강화하기 위한 정책을 수립할 때 유용한 기초자료로 활용될 것으로 기대된다.

• 디지털융복합연구
• /
• 제18권6호
• /
• pp.479-493
• /
• 2020

중국 우한 시에서 최초로 발병한 코로나바이러스감염증(이하 COVID-19)으로 인한 인명 피해 및 사회·경제적 손실은 매우 크며 현재 세계 주요 각국에서는 COVID-19와 같은 감염병의 확산을 막기 위해서는 발생 추이를 초기에 정확히 예측하는 것이 중요하다고 보고 감염병 대응 체계 구축 시 인공지능을 적극 활용하고 있다. 이에 본 연구에서는 감염병 확산에 대응하기 위한 해외 각국의 인공지능 활용 현황을 파악, 국내 현황과 비교·분석했으며 몇 가지 시사점을 도출할 수 있었다. 연구 결과 보다 효율적으로 인공지능을 활용해 감염병에 대응하기 위해서는 원 헬스(One Health) 기반의 국가 컨트롤타워 구축이 필요하다는 결론이 도출되었으며 이에 컨트롤타워가 갖춰야 할 요건을 살펴보았다. 또한 국가 안보 차원에서의 감염병 대응을 위해 상위 기관인 의료 빅데이터 거버넌스를 설립할 것을 제안하였다. 향후 본 연구에서 도출된 결론 및 시사점을 정책적으로 활용하기 위한 연구가 필요할 것으로 보이며 본 연구가 제안하는 바를 반영해 제도적 미비점을 보완한다면 감염병 확산 방지 및 의료 빅데이터를 유용하게 활용하는데 긍정적으로 작용할 것으로 전망된다.

• 천문학회지
• /
• 제36권spc1호
• /
• pp.37-44
• /
• 2003

In this paper, we review recent studies on the magnetic helicity changes of solar active regions by photospheric horizontal motions. Recently, Chae(200l) developed a methodology to determine the magnetic helicity change rate via photospheric horizontal motions. We have applied this methodology to four cases: (1) NOAA AR 8100 which has a series of homologous X-ray flares, (2) three active regions which have four eruptive major X-ray flares, (3) NOAA AR 9236 which has three eruptive X-class flares, and (4) NOAA AR 8668 in which a large filament was under formation. As a result, we have found several interesting results. First, the rate of magnetic helicity injection strongly depends on an active region and its evolution. Its mean rate ranges from 4 to $17 {\times} 10^{40}\;Mx^2\;h^{-1}$. Especially when the homologous flares occurred and when the filament was formed, significant rates of magnetic helicity were continuously deposited in the corona via photospheric shear flows. Second, there is a strong positive correlation between the magnetic helicity accumulated during the flaring time interval of the homologous flares in AR 8100 and the GOES X-ray flux integrated over the flaring time. This indicates that the occurrence of a series of homologous flares is physically related to the accumulation of magnetic helicity in the corona by photospheric shearing motions. Third, impulsive helicity variations took place near the flaring times of some strong flares. These impulsive variations whose time scales are less than one hour are attributed to localized velocity kernels around the polarity inversion line. Fourth, considering the filament eruption associated with an X1.8 flare started about 10 minutes before the impulsive variation of the helicity change rate, we suggest that the impulsive helicity variation is not a cause of the eruptive solar flare but its result. Finally, we discuss the physical implications on these results and our future plans.

• 천문학회보
• /
• 제38권2호
• /
• pp.89.1-89.1
• /
• 2013

We present a multiwavelength study of the X-class flare, which occurred in active region (AR) NOAA 11339 on 3 November 2011. The EUV images recorded by SDO/AIA show the activation of a remote filament (located north of the AR) with footpoint brightenings about 50 min prior to the flare occurrence. The kinked filament rises-up slowly and after reaching a projected height of ~49 Mm, it bends and falls freely near the AR, where the X-class flare was triggered. Dynamic radio spectrum from the Green Bank Solar Radio Burst Spectrometer (GBSRBS) shows simultaneous detection of both positive and negative drifting pulsating structures (DPSs) in the decimetric radio frequencies (500-1200 MHz) during the impulsive phase of the flare. The global negative DPSs in solar flares are generally interpreted as a signature of electron acceleration related to the upward moving plasmoids in the solar corona. The EUV images from AIA $94{\AA}$ reveal the ejection of multiple plasmoids, which move simultaneously upward and downward in the corona during the magnetic reconnection. The estimated speeds of the upward and downward moving plasmoids are ~152-362 and ~83-254 km/s, respectively. These observations strongly support the recent numerical simulations of the formation and interaction of multiple plasmoids due to tearing of the current-sheet structure. On the basis of our analysis, we suggest that the simultaneous detection of both the negative and positive DPSs is most likely generated by the interaction/coalescence of the multiple plasmoids moving upward and downward along the current-sheet structure during the magnetic reconnection process. Moreover, the differential emission measure (DEM) analysis of the active region reveals presence of a hot flux-rope structure (visible in AIA 131 and $94{\AA}$) prior to the flare initiation and ejection of the multi-temperature plasmoids during the flare impulsive phase.

• Journal of Electrical Engineering and Technology
• /
• 제7권5호
• /
• pp.765-771
• /
• 2012

$SF_6$ gas has been used as arc quenching and insulating medium for high and extra high voltage switching devices due to its high dielectric strength, its excellent arc-quenching capabilities, its high chemical stability and non toxicity. Despite of its significant contributions, the gas was classified as one of the greenhouse gas in the Kyoto Protocol. Thus, many researches are conducted to find out the replacement materials and to develop the $SF_6$ gas useless electrical equipment. This paper describes experiments on the temperature change-related breakdown characteristics of $SF_6$ gas ($SF_6$) and $SF_6$ liquid ($LSF_6$) in a model GIS(Gas-Insulated Switchgear) chamber in order to show the possibility of more stable and safe usages of $SF_6$ gas. The breakdown characteristics are classified into three stages, namely the gas stage of $SF_6$ according to Paschen's law, the coexisting stage of $SF_6$ gas with liquid in considerable deviation at lower temperature, and the stage of $LSF_6$ and remaining air. The result shows that the ability of the $LSF_6$ insulation is higher than the high-pressurized $SF_6$. Moreover, it reveals that the breakdown characteristics of $LSF_6$ are produced by bubble-formed $LSF_6$ evaporation and bubbles caused by high electric emission and the corona. In addition, the property of dielectric breakdown of $LSF_6$ is determined by electrode form, electrode arrangement, bubble formation and movement, arc extinguishing capacity of the media, difficulty in corona formation, and the distance between electrodes. The bubble formation and flow separation phenomena were identified for $LSF_6$. It provides fundamental data not only for $SF_6$ gas useless equipment but also for electric insulation design of high-temperature superconductor and cryogenic equipment machinery, which will be developed in future studies.

• 조명전기설비학회논문지
• /
• 제27권8호
• /
• pp.83-89
• /
• 2013

In this paper, discharge characteristics of air in the vertical arrangement of three rods(dome-shaped, cylinder-shaped, and needle-shaped rod) and plane gap having propane flame on the plane electrode are examined under the application of a.c. and d.c. high-voltages. As the result of the experiment, flashover voltages in the presence of the flame are substantially lowered than those in the absence of flame, and relative a.c. flashover voltages in the dome-shaped, cylinder-shaped, and needle-shaped rod gaps are found 32.5%, 32.1%, and 26.4% respectively. The polarity effects with the d.c. voltages are shown, and flashover voltages in negative polarity are much lowered than those in positive one. The negative flashover voltages in the dome-shaped and cylinder-shaped gaps are found 18.3% and 18.7% respectively, but the positive ones are found 53.5% and 43.2% respectively. In the needle-shaped rod gaps, meanwhile, the flame is extinguished by corona wind, and the quenching voltages are found 28.4% under the application of a.c. voltages. The ion winds of corona and the reduction of air density are the main factors of flashover reduction owing to the flame in the case of a.c. voltages, but the electrifications of the positive ion by thermal ionization besides the above factors are remarkably found in the case of d.c. voltages.

• The Journal of Korean Physical Therapy
• /
• 제29권3호
• /
• pp.109-114
• /
• 2017

Purpose: The ascending reticular activating system (ARAS) is responsible for regulation of consciousness. In this study, using diffusion tensor imaging (DTI), we attempted to reconstruct the thalamocortical projections between the intralaminar thalamic nuclei and the frontoparietal cortex in normal subjects. Methods: DTI data were acquired in 24 healthy subjects and eight kinds of thalamocortical projections were reconstructed: the seed region of interest (ROI) - the intralaminar thalamic nuclei and the eight target ROIs - the medial prefrontal cortex, dorsolateral prefrontal cortex, ventrolateral prefrontal cortex, orbitofrontal cortex, premotor cortex, primary motor cortex, primary somatosensory cortex, and posterior parietal cortex. Results: The eight thalamocortical projections were reconstructed in each hemisphere and the pathways were visualized: projections to the prefrontal cortex ascended through the anterior limb and genu of the internal capsule and anterior corona radiata. Projections to the premotor cortex passed through the genu and posterior limb of the internal capsule and middle corona radiata; in contrast, projections to the primary motor cortex, primary somatosensory cortex, and posterior parietal cortex ascended through the posterior limb of the internal capsule. No significant difference in fractional anisotropy, mean diffusivity, and fiber volume of all reconstructed thalamocortical projections was observed between the right and left hemispheres (p>0.05). Conclusion: We reconstructed the thalamocortical projections between the intralaminar thalamic nuclei and the frontoparietal cortex in normal subjects. We believe that our findings would be useful to clinicians involved in the care of patients with impaired consciousness and for researchers in studies of the ARAS.

• 천문학회보
• /
• 제35권2호
• /
• pp.67.2-67.2
• /
• 2010

We present results of searching for the Very Low Luminosity Objects (VeLLOs; internal luminosity : $L_{int}$ < $0.1(d/140pc)^2\;L\odot$) in the Gould's Belt clouds using observations from 3.6 to 70 micron by the Spitzer Space Telescope. The clouds are California, Chamaeleon I, III, Musca, Lupus V, VI, Scorpius, Serpens, Corona Australis, Cepheus, and IC 5146 having the properties of active low-mass star-forming such as the Taurus cloud. The observing sensitivity of the Spitzer data is estimated to be about $L_{int}\;\geq\;5\times10^{-3}(d/140pc)^2\;L\odot$, a factor of 20 better than that of the Infrared Astronomical Satellite (IRAS). The observing data were processed by the c2d Legacy pipeline. As the criteria to select the VeLLOs, we slightly modified previous ones by Dunham et al. The most important criterion is a flux density at 70 micron that is directly converted to the internal luminosity. Also, we used additional criteria to remove the contamination of evolved stars and extragalaxies which have colors or SEDs very similar to YSOs. We identified a total of 64 new embedded VeLLO candidates with $L_{int}$ < $0.1(d/140pc)^2\;L\odot$, consisting of 8 in California, 15 in Chamaeleon-Musca, 13 in Scorpius-Lupus, 20 in Serpens, 3 in Corona Australis, 3 in Cepheus, and 2 in IC 5146. The classification of the spectral index (${\alpha}$) fitted to the shape of the Ks-24 micron SEDs shows most of VeLLO candidates (89%) are in types of Class I and Flat spectrum. We plot various diagrams based on their 2MASS-Spitzer bands colors and magnitudes to discuss properties of the VeLLOs. This search will lead us new adventure toward a future systematic study of the VeLLOs.

• 융합보안논문지
• /
• 제20권3호
• /
• pp.99-108
• /
• 2020

신종 코로나 바이러스(SARS-CoV-2)로 인한 팬데믹이 확산되는 추세로 단기간 내 종식을 기대하기 힘든 상황이다. 디지털 기술의 활용은 코로나19 억제에 대해 가시적인 성과를 보여주고 있지만, 개인정보호호 측면에서는 논란이 되고 있다. 본 논문에서는 코로나19 팬데믹에 대한 우리나라 및 각국의 대응 현황을 살펴보고, 디지털 도구를 활용하되 개인정보를 보호하는 방향에 대해 제언한다. 팬데믹 억제를 위해서는 데이터 수집 및 처리가 필수적이지만 개인정보보호를 고려하여 꼭 필요한 수준과 범위로 제한해야 하고, 국제적 규모의 협력과 한시적이고 투명한 개인정보 이용, 이를 위한 법적·제도적 기반 확립이 필요하다. 오늘날 이 같은 데이터와 알고리즘 활용은 지속적으로 증가할 것이므로, 이와 더불어 개인정보보호를 위한 기술·제도적 보완 노력이 계속되어야 한다.