• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.6 no.3
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• pp.206-217
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• 1994

In this study, indoor thermal parameters were measured to investigate the characteristics of thermal environments and 212 occupants were questioned to evaluate Korean thermal comfort in office building in summer. Thermal and comfort sensations were estimated using PMV(Predicted Mean Vote) and ET* (New Effective Temperature) which are most widely used nowadays. Comparing this experimental result with international standards and that of other research, Korean thermal responses were discussed. It was found that TSV(Thermal Sensation Vote) is more sensitive than PMV to the variation of temperature and that the measured percentage of dissatisfied is higher than PPD(Predicted Percentage of Dissatisfied) in real office building environments. By regression analysis, the following regression equation has been obtained: TSV=0.461ET*-11.808 and neutral temperature is $25.6^{\circ}C$ in this case. Thermal comfort range based on 80% satisfaction is also $24.0{\sim}26.8^{\circ}C$, which is about $1^{\circ}C$ higher than that of ANSI/ASHRAE Standard.

• Proceedings of the SAREK Conference
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• 2009.06a
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• pp.590-595
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• 2009

PMV and ADPI were numerically investigated in a large space of various ceiling height with air-conditioning systems of two type. The numerical results showed that it is small that the growth of cooling load according to ceiling height rise in a large space without windows. In case of system air-conditioner of duct type embedded in the ceiling, the air mixing effect in indoor is superior to a case installed 4way cassette type in it. For controling thermal comfort at indoor, a system air-conditioner of duct type embedded in the ceiling is little influenced according to ceiling height rise in a large space considered.

• Science of Emotion and Sensibility
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• v.1 no.1
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• pp.199-211
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• 1998

본 연구의 목적은 한국인을 대상으로 겨울철 체감실험을 통해 SET*(PMV)와 상관관계를 규명하고, ASHRAE Standard 55-74의 쾌적영역과 한국인의 쾌적영역을 비교 검토하는 것이다. 실험에 참가한 각 피험자는 동일한 유니폼을 착용한 체 의자에 앉아 환경시험실에서 2시간 체재하였다. 피험자의 평균피부온도는 신체 3군데에서 측정한 피부온도 값을 이용하였고, 전신온냉감 및 쾌불쾌감 신고는 매 15분 간격으로 측정하였다. 전신온냉감 신고 스케일은 -3= cold, -2=cool, -1=slight cool, o=neutral, +1= Slightly warm, +2=warm, +3=hot 이며, 쾌불쾌감 신고스케일은 0=comfortable, +1=slightly comfortable, +2=uncomfortable, +3=very uncomfortable이다. 겨울철 체감실험을 통해 아래의 결론을 얻었다. 1)전신온냉감이 중립이 될때 청년층의 SET*는 25.5$^{\circ}C$이며, 고령자의 중립온도는 27$^{\circ}C$이었다. 고령자는 청년에 비해 $1.5^{\circ}C$(SET*) 정도 고온을 선호하였다. 2)청년층의 쾌적영역은 24.2-26.8$^{\circ}C$(SET*)이며, 고령자의 쾌적영역은 25.7-28.2$^{\circ}C$이었다. 이러한 쾌적영역은 ASHRAE의 쾌적영역보다 고온지향적임을 알 수 있었다.

• Proceedings of the SAREK Conference
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• 2008.06a
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• pp.1213-1219
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• 2008

This experimental study was to analyze thermal comfort and indoor air quality(IAQ) with ventilation and humidification in the classroom when system air conditioner was operated. The thermal comfort was estimated by the PMV index and the concentration of $CO_2$ and total suspended particle(TSP) were measured and compared with ventilation and humidification. As a result, the class room temperature distribution was $2{\sim}5^{\circ}C$ low during operating ventilation system and humidification. At 60% RH, PMV values of measuring points were ranged from +0.5 to -0.5 indicating optimal the range of thermal comfort. The average concentration of $CO_2$ gas and TSP were reduced 645 ppm, 0.17 mg/$m^3$ respectively, during operating the ventilation system. From the results, to maintain comfortable environment in the heated classroom, the ventilation and humidification were needed in winter season.

• Journal of Environmental Science International
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• v.25 no.2
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• pp.311-322
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• 2016

This study reduced and built Street Canyons created by skyscrapers in order to verify effect of Street Canyons by green wall within the city centre and analysed influence factors on temperature reduction according to applicative types of green wall in the lab. Applicative types were divided into three types such as non- greening type(Case A), one-side greening type(Case B), both side greening type(Case C). The result of analysis of each types showed that average temperature of Case B and Case C is respectively $1.0^{\circ}C$ and $1.7^{\circ}C$ lower than Case A. The result of analysis of WBGT was that the highest temperature was given by Case A($40.2^{\circ}C$) and second one was from Case B($39.8^{\circ}C$) and third one was from ($39.1^{\circ}C$) and in UTCI Case A records the highest temperature of $34.7^{\circ}C$ and Case B provided the second highest temperature of $33.9^{\circ}C$ and Case B gave the lowest temperature of $32.7^{\circ}C$. In PMV the highest temperature of 2.65 was from Case B and second one of 2.61 was from Case A and third one of 2.54 was from Case C. Duncan analysis of each types based on solar radiation and thermal comfort generated that there was analytical significance between Case A and Case B and Case B in terms of each types of average temperature reduction. The significance of thermal comfort in WBGT, MRT, PMV showed non-significance but, In UTCI it was analysed that there was significance between Case C and Case A.

• Korean Journal of Environmental Agriculture
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• v.37 no.4
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• pp.268-276
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• 2018

BACKGROUND: In the month of January 2018, fine dust alerts and warnings were issued 36 times for $PM_{10}$ and 81 times for PM2.5. Air quality is becoming a serious issue nation-wide. Although interest in air-purifying plants is growing due to the controversy over the risk of chemical substances of regular air-purifying solutions, industrial spread of the plants has been limited due to their efficiency in air-conditioning perspective. METHODS AND RESULTS: This study aims to propose a vegetation-based bio-filter system that can assure total indoor air volume for the efficient application of air-purifying plants. In order to evaluate the quantitative performance of the system, time-series analysis was conducted on air-conditioning performance, indoor air quality, and comfort index improvement effects in a lecture room-style laboratory with 16 persons present in the room. The system provided 4.24 ACH ventilation rate and reduced indoor temperature by $1.6^{\circ}C$ and black bulb temperature by $1.0^{\circ}C$. Relative humidity increased by 24.4% and deteriorated comfort index. However, this seemed to be offset by turbulent flow created from the operation of air blowers. While $PM_{10}$ was reduced by 39.5% to $22.11{\mu}g/m^3$, $CO_2$ increased up to 1,329ppm. It is interpreted that released $CO_2$ could not be processed because light compensation point was not reached. As for the indoor comfort index, PMV was reduced by 83.6 % and PPD was reduced by 47.0% on average, indicating that indoor space in a comfort range could be created by operating vegetation-based bio-filters. CONCLUSION: The study confirmed that the vegetation-based bio-filter system is effective in lowering indoor temperature and $PM_{10}$ and has positive effects on creating comfortable indoor space in terms of PMV and PPD.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 1998.11a
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• pp.133-139
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• 1998

생활수준이 향상됨에 따라 인간의 감성을 생활환경에 적용하려는 연구가 진행되고 있다. 감성에 영향을 미치는 요인은 다양하나 이 중에서도 열환경은 인간에게 미치는 정도가 어떠한 요인보다도 큰 것으로 알려져 있다. 열환경이라 함은 온도, 습도, 기류, 복사열을 말하며 이 요소들은 인간의 감성과 밀접한 관련을 지닌다. 실내의 열환경은 공조방식에 따라 크게 달라지며 본 연구에서는 천장분출과 바닥분출 공조방식의 비교실험을 수행하여 실내의 열환경을 평가한다. 두 공조방식을 여름철 사무실 공간을 모사하는 열환경챔버에 적용하여 실내의 온도, 기류, 복사온도, PMV의 분포를 측정한다. 실험 결과 바닥분출 공조방식이 쾌적성과 에너지 절약면에서 우수함을 알 수 있었다.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 1998.04a
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• pp.249-254
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• 1998

생활수준이 향상됨에 따라 인간의 감성을 생활환경에 적용하려는 연구가 진행되고 있다. 감성에 영향을 미치는 요인은 다양하나 이 중에서도 열환경은 인간에게 미치는 정도가 어떠한 요인보다도 큰 것으로 알려져있다. 열환경이라 함은 온도, 습도, 기류, 복사열을 말하며 이 요소들은 인간의 감성과 밀접한 관련을 지닌다. 실내의 열환경은 공조방식에 따라 크게 달라지며 본 연구에서는 천장분출과 바닥분출 공조방식에 따른 실내의 열환경을 평가한다. 두 공조방식을 여름철 사무실 공간에 적용하여 실내의 온도, 기류, 복사온도, PMV의 분포를 수치해석적으로 계산한다. 해석 결과 바닥분출 공조방식이 쾌적성과 에너지 절약면에서 우수함을 알 수 있었다.

• Journal of the Korean Society of Industry Convergence
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• v.9 no.4
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• pp.317-321
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• 2006

본 연구는 웰빙 환경 조성에 적합한 습도센서, 온도센서와 기류센서를 이용한 쾌적도 측정시스템에 관한 것이다. 이 측정시스템이 나타내는 쾌적도는 기류와 온도에 민감하게 나타났다. 시스템을 위한 온도와 습도 일체형 센서와 기류센서를 설계 및 제작하고, 마이크로 컨트롤러에서 센서 신호를 측정하여 ISO7730에서 나타내는 예상온열 감지수(PMV)와 쾌적감 지수(CSV)를 계산하고, 각각의 계산 값을 LCD에 표시하도록 하였다. 인위의 환경에서 실험한 결과, 본 시스템이 공기조화시스템, 자동차 기류조정시스템, 가정과 사무실 병원 등의 많은 분야에 적용이 될 수 있음을 알 수 있었다.

• Journal of Korean Association for Spatial Structures
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• v.8 no.1
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• pp.77-88
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• 2008

This research aims to divide the large enclosures according to summer and winter seasons, and to measure changes in the indoor thermal conditions. Also, with regard to air conditioning and exterior environments, it aims to identify the characteristics of indoor thermal environments such as indoor vertical and horizontal temperature distribution in large enclosures, temperature distribution in the audience's seating, indoor surface temperature distribution, wind speed distribution in the audience's seating, and indoor thermal comfort.