The purpose of this study is to analyze the effect of temperature and humidity on the measured Particulate Matter (PM) concentrations recorded by PMS5003T, a low-cost light scattering type measuring tool. A regression analysis was performed on the ratio of PM concentrations measured by the light scattering method and the beta-ray absorption method according to temperature and humidity in an outdoor environment. As the temperature decreased, the PM concentration ratio increased, and this tendency intensified below 0oC. As the humidity increased, the PM concentration ratio increased, but the effect was less than the temperature effect. The coefficients of determination for temperature and humidity were R2 = 0.325 and 0.003, respectively, and the effects of temperature and humidity on the measured values w ere formulated and compensated for. As a result of the compensation, R2, relative precision, accuracy and RMSE improved from 0.927 to 0.958, from 91.183% to 96.651%, from 31.383% to 74.058%, and from 13.517 μg/m³ to 6.690 μg/m³, respectively. Finally, results from this study indicate that the reliability of the low-cost light scattering type PM sensor can be improved by applying the temperature and humidity compensation method.

Since 1974, the urban subway has been used as a major form of public transportation in Seoul, Korea. The air quality in the subway environment depends on the introduction of air pollutants from roadway air and its generation is caused by subway operation in the tunnel. In the subway tunnel, PM10 concentration was monitored from March 8 to 15, 2018 and from March 26 to 28, 2018, and compared with concentrations that are routinely monitored at the subway concourse and the nearest roadside air quality monitoring station (RAQMS). Overall PM10 concentration at the concourse was similar to that of the RAQMS. However, PM10 concentration in the tunnel was significantly higher than those of the subway concourse and RAQMS, and showed distinct diurnal variation caused by train operation. The dominant peak concentrations were highly correlated with the number of train operations per hour. The minimum PM10 concentration was observed between 2 am to 5 am when the train was not operated. This was similar to that of the RAQMS. Although the diurnal variation of the PM10 concentration at the concourse is not significant, the overall trend is similar to that in the tunnel.

The urban railway system is a convenient public transportation system, as it carries many people without increasing traffic congestion. However, air quality in urban railway environments is worse than ambient air quality due to the internal location of the source of air pollutants and the isolated space. In this paper, characteristics of particulate matter (PM) pollution in urban railway environments are described from the perspective of diurnal variation, chemical composition and source apportionment of PM. PM concentrations in concourse, platform, passenger cabin, and tunnel are summarized through an analysis of 34 journal articles published in Korea and overseas. This information will be helpful in developing effective policies to reduce PM pollution in urban railway environments.

While the air quality of public facilities such as daycare centers is managed by law, the management of air quality in residential buildings is not mandatory. For this reason, air quality in an apartments has not been well surveyed. In this study, we investigated the influence of cooking and ventilation on the indoor air quality in an apartment. Continuous measurements were performed using real-time monitoring instruments from June 9 to 17, 2014 in Seoul, Korea. A CO2 meter was used to measure CO2 concentration and temperature. A portable aerosol spectrometer (0.25-32 μm), a nanoparticle aerosol monitor (10-1,000 nm), and an aethalometer (total suspended particulate, black carbon) were also used. During the measurement period, ventilation and cooking activities were observed 8 and 10 times, respectively. In 5 of the observed cases, both activities were done simultaneously. During the ventilation, CO2 concentration and temperature were decreased; however, particle concentrations were increased. When cooking was done, particle concentration was increased in some cases; however, CO2 concentration and temperature were unchanged. Combined cased CO2 concentration and temperature were decreased and particle concentrations were increased.

The number of children who use day-care centers is increasing. Most indoor air quality (IAQ) management has been based on daily average pollutant concentrations measured once a year. A more comprehensive management of IAQ is needed to protect children’s health from air pollutants in day-care centers. In this study, we investigated the weekly variation of air pollutant concentrations in a nursing room of a day-care center located at the roadside for a week in June of 2014. Average concentrations of CO2, PM10, black carbon, and total surface area of lungdeposited particles during nursing time of the day-care center were 510 ppm, 27.8 μg/m3, 1.87 μg/m3, and 30.6 μm2/cm3, respectively, with a similar diurnal pattern shown on weekdays.

본 연구는 미술작품의 선호가 개인의 성격요인과 관련되는지 알아보기 위해 수행되었다. 특정 시대를 대표하는 미술사조에 대한 선호와 성격요인과의 상관에 관한 연구들이 보고되어 왔으나, 감상자에게 예술작품은 사조보다는 그림 자체가 주는 인상과 느낌이 더 중요하게 다가온다. 본 연구에서는 긍정 정서, 부정 정서를 일으키는 그림과 특정 정서를 유발하지 않는 중립적인 그림이 성격요인과 어떤 관계를 가지는지 알아보고자 하였다. 또한 자극의 친숙성 이 그림 선호에 미치는 영향을 검토하였다. 참가자는 성격 5요인 질문지에 응답한 후, 제시되는 그림을 보고 그 그림을 얼마나 선호하는지 평정하였다. 선호 평정이 끝난 후, 앞서 제시된 자극들을 다시 보고 그 그림을 알고 있었는지를 평정하였다. 결과, 성격 5요인 중 신경증 점수가 높을수록 부정적 정서를 유발하는 그림을 선호하는 것으로 나타났다. 이는 슬픔, 고통과 같은 부정적 정서를 유발하는 예술에 대한 선호라는 설명하기 어려운 현상에 대해, 신경증이라는 성격요인으로의 설명가능성을 시사한다. 또한 각 정서표현 그림의 친숙점수와 선호점수 간 정적 상관이 나타나 친숙한 그림이 더 선호될 것이라는 가설이 지지되었다. 예술작품에 대한 선호에 대해서는 개인마다 다르다는 주관성과 일반적 으로 널리 받아들여지는 미의 객관성이 모두 존재한다. 본 연구는 예술 선호가 갖는 주관성을 성격이라는 개인차를 통해 설명하고, 기존 연구의 사조적 분류방식에서 탈피하여 예술작품을 심리학적 관점에서 연구하였다는 점에서 의미 가 있다.

본 연구는 성별과 연령, 감성차원(날카롭다/부드럽다, 앳되다/성숙하다)에 따라 얼굴매력에 대한 평가가 달라지는지 알아보고자 하였다. 본 연구는 각 참가자들에게 60개의 여성 얼굴 사진에 대하여 9점 척도로 이루어진 세 차원(‘날카롭다/부드럽다’, ‘앳되다/성숙하다’, ‘전혀 매력적이지 않다/매력적이다’)에 평정하도록 제시하였고, 총 131명이 참가하였다(초등학생: 48명, 중학생: 44명, 대학생: 39명; 남자: 60명, 여자: 71명). 연구 결과를 알아보기 위하여 다층분석을 실시하였다. 성별과 세 연령집단 모두 얼굴이 앳될수록, 부드러울수록 매력적으로 평가하였다. 한편 성별과 연령에 따른 매력 정도의 차이가 있었다. 대학생이 초등학생과 중학생보다 매력을 더 높게 평가하였고 남자보다 여자가 동일한 사진을 더 매력적으로 평가하였다. 또한 대학생과 초등학생 간의 ‘날카롭다/부드럽다’ 차원의 평가가 유의미하게 달랐으며, 이는 대학생보다 초등학생에게 ‘날카롭다/부드럽다’ 차원이 얼굴매력 평정에 더 크게 영향을 미치는 것으로 해석된다. 본 연구 결과는 얼굴이 앳될수록, 부드러울수록 얼굴을 매력적이라고 판단하지만, 감성차원이 매력에 미치는 효과가 성별과 연령에 따라 차이가 있음을 시사한다.

Day-care center is one of living micro-environments for children. In urban area, day-care centers may be influencedby air pollutants emitted from the vehicle exhaust. In this work, diurnal variation of major pollutants and effectof outdoor air on indoor air quality were investigated using real-time instruments for a day-care center locatednear the heavy road. 48-h continuous monitoring at both indoor and outdoor were made in summer. The day-care center equipped with ceiling system air-conditioners was operated from 7:30 a.m. to 19:30 p.m. Indoor CO₂concentration responded greatly to the human activity. Indoor NO₂ concentration shows a big difference betweendaytime and nighttime, implying that outdoor NO₂ may penetrate into the indoor through opening of doors orwindows during the daytime. Indoor to outdoor concentration ratio of submicron particle surface area is <1 dueto the penetration of outdoor ultrafine particles.

본 연구에서는 객관적인 아름다움에 대한 주관적인 미적 경험으로서의 인지적, 감정적 경험에 관여하는 뇌 활성화 과정을 기능적 자기공명영상을 이용하여 검토해 보았다. 우선, 프랙탈 이미지에 대한 미적평가 행동과 제로 보편적인 아름다움의 준거를 확인하였다. 평정 결과에 기초하여, 전체 270개 이미지 중 가장 점수가 높은 50개를 아름다운 이미지로, 점수가 낮은 50개를 아름답지 않은 이미지로 선정하였다. 두 가지 조건을 블록으로 제시한 신경영상 연구 결과, 아름답다고 평가한 이미지에 대해서는 미적 경험에 관여하는 인지적, 정서적 처리에 관여된 부위인 전두엽과 대상회와 뇌섬엽이 활성화되었으며, 아름답지 않다고 평가한 이미지에 대해서는 부정적인 정서와 관련된 중후두회와 전설소엽의 활성화가 관찰되었다. 아름다움 평가에 대한 조건별 접속분석의 결과, 미적평가가 긍정적인 이미지에 대해서는 측두엽의 활성화가, 부정적인 이미지에 대해서는 두정엽의 활성화가 특징적으로 나타났다. 이에 대해 의미론적 해석과 추상화 과정과 연결하여 논의하였다.

규범적 표상은 단어나 주제가 주어졌을 때 자연스럽게 떠오르는 심상이다. 이러한 규범적 표상은 대상의 특징을 가장 잘 드러낼 수 있는 특정한 조망이나 방향으로 떠오르게 된다. 규범적 표상이 측면임을 시사하는 선행 연구를 바탕으로 본 연구에서는 규범적 표상의 방향성을 검토하였다. 규범적 표상을 자연범주와 인공범주로 구분하여 자극의 제시 방향에 따른 차이를 알아보았다. 실험은 그림의 방향성(왼쪽/오른쪽)과 범주(동물, 자연범주/도구, 인공범주)를 두 가지 독립변인으로 하여 설계하였으며 단어-그림 일치 판단과제를 사용하여 정답 반응률과 반응시간을 측정하였다. 그 결과, 정답 반응률은 범주 내에서 방향성에 따른 모든 조건에서 천장효과를 보였으며 아주 근소한 차이만 있었다. 반응시간에서 범주변인의 주효과, 범주와 방향성의 상호작용 효과가 나타났다. 특히 자연범주에 속하는 동물 그림에서 방향성 효과가 관찰되었다. 동물의 머리가 왼쪽으로 향하는 그림이 오른쪽으로 향하는 그림 보다 반응시간이 유의하게 빨랐다. 그러나 인공범주에 속하는 도구 그림에서는 방향성의 효과가 나타나지 않았다. 이러한 결과는 동물의 규범적 표상의 방향성은 왼쪽을 향하는 것임을 시사한다.

Vehicle drivers are subject to be exposed to high concentrations of airborne pollutants emitted from vehicles on roads. To investigate the indoor air quality of vehicles on roads, black carbon (BC) was measured inside a passenger car commuting between the residential area in southern Seoul and the Korea Institute of Science and Technology (KIST) in northern Seoul using a portable aethalometer. When the vehicular windows were closed, the ventilation mode was set to fresh air mode (or circulation mode) for a total of thirteen runs made during May 2005. When the windows were open, the analysis was made with the system turned off (for twelve runs in October 2005). The BC concentration depended on such parameters as spatial location, time of day, and ventilation mode. The average BC concentration measured on non-express ways was higher than those measured on express ways, inside KIST, and nearby the residential area for most runs. On circulation mode, the average BC concentration was 5.9±1.7 ㎍/㎥ in the afternoon or evening, which was similar to a 24-hr average BC concentration for ambient air at 200 m apart from a road in Seoul. In the case of fresh air mode, the average BC concentrations measured in the morning rush hour, in the afternoon or evening, and after midnight were 22.8±3.4, 15.9±7.7, 3.7 ㎍/㎥, respectively. The average BC concentrations measured with the vehicular window open were 31.9±9.2, 19.4±5.9 ㎍/㎥, respectively in the morning rush hour and in the afternoon or evening. These measured values were higher than those measured with the windows closed. The average BC concentrations inside a passenger car with a fresh mode operation or open-window driving were significantly higher than a 24-hr average BC concentration measured at 200 m apart from a road in Seoul.

Potassium (K) is an element essential for plant growth. This study was aimed to examine the effects of three formulations of potash feldspar, powder, sand, and granule type on the growth of radish and beet in organic farming. 0.1% three formulations of potash feldspar were treated on the soil before transplanting 15 days-old seedlings of radish and beet in greenhouse. The results showed that all kinds of potash feldspar significantly increased shoot and root growth, and soluble solid contents excepted for root hardness in radish and beet. Among them, the powder type of potash feldspar was the most effective on foliage and root growth of radish and beet. Based on the results, it was confirmed that 0.1% potash feldspar treated in the rhizosphere of radish and beet can promote the growth of them.

The purpose of this study was to estimate the growth promoting effects and improvement of antioxidant activity of the soybean sprouts treated with Chlorella sp. culture solution. The soybean sprout treated with 0.1% and 0.2% Chlorella sp. culture solution was significantly increased the length (more than 43.0%), the thickness (more than 0.5~0.7 mm), fresh weight (more than 2.9~3.7 g) compared to non-treated control in vitro. In organic soybean sprouts farm, the 0.2% chlorella culture solution applied to mass culture of soybean sprout and the fresh weight of soybean sprouts increased by more than 25% and the yield was very high as 598.33% compared to untreated control. In addition of sensory test, there is no fishy odor and better crunchy texture and nutty flavor for the treatment soybean sprouts compared to untreated soybean sprouts. Particularly, free-radical scavenging activity (DPPH) and superoxide dismutase activity (SOD) of the soybean sprouts were significantly increased more than 26.1% and 40.4%, respectively by treated with 0.1% and 0.2% Chlorella culture solution. Consequently, the treatment of chlorella culture solution to grow soybean sprouts is also promoting quality and antioxidant activity as well as promoting the growth of sprouts. Therefore, chlorella is considered to be worth as functional materials for high-quality sprouts grown.