Environmental Test Room Research Articles

청각 및 후각자극에 의한 뇌파(EEG)와 진동이미지기술의 상관성 분석에 관한 연구

Abstract EEG has been used to measure the emotion of amenity and discomfort in the interior space. EEG is limitedto the experiment, because it is a equipment of contact type. However, Vibraimage can measure the emotion witha web camera. Because Vibraimage is a equipment of non-contact type, it is more suitable for the interior space thanEEG. Therefor, it tries to find a correlation variable between EEG and Vibraimage to measure the human emotions.In this study, it were analyzed correlation of EEG and vibraimage due to variation of loudness 60[dB], 90[dB] androsemary, jasmine scents. Check the health status of subjects who were selected 3 male students, and the period ofthis experiment was about months. The condition of the environmental test room was in temperature 25[ ℃ ], relative humidity 50[RH%], air current speed 0.02[m/s] and illuminance 1000[lux]. It were analyzed correlation of twenty-three index of EEG(absolute  , relative  , absolute  , relative  , absolute  , relative

아로마 및 색온도의 다감각자극이 뉴로에너지에 미치는 영향

본 논문은 온도 <TEX>$25[^{\circ}C]$</TEX>, 상대습도 50[RH%], 조도 1,000[lux] 및 기류 속도 0.02[m/sec]의 동일한 조건의 항온 항습실에서 감각자극에 노출되기 전, 쟈스민 향기 및 RED 조명의 단일감각자극, 쟈스민 향기와 RED 조명을 동시에 노출시킨 다감각 자극 변화에 따른 EEG, 학습능력, HRV 및 진동이미지를 측정하여 쾌적성, 집중력, 신체적 및 심리적 안정의 변화를 분석하였다. 연구결과 쟈스민 향기와 RED 조명의 다감각자극에서 상대 <TEX>$S{\alpha}$</TEX>파, SEF50, <TEX>$SMR/{\theta}$</TEX> 및 SDNN이 향상되었고, 비대칭지수 <TEX>$A_2$</TEX>, 스트레스지수, 피로도 및 HRT는 감소하였다. 또한, 진동이미지의 긴장/불안과 스트레스는 감소하였다. 따라서 쟈스민 향기와 RED 조명의 다감각자극이 쾌적성, 작업능률의 생산성 및 주의집중력과 같은 뉴로에너지를 향상시키기 위하여 효과적인 것을 알 수 있었다. In this study, EEG, HRV, and Vibra image were compared and analyzed in the environmental test room due to stimulation of aroma and color temperature. The condition of the environmental test room was in temperature <TEX>$25[^{\circ}C]$</TEX>, relative humidity 50[RH%], air current speed 0.02[m/s] and illuminance 1000[lux] with setting up different sensory stimulation condition which are before exposure, single-sensory stimulation of Jasmine scent, single-sensory stimulation of RED color lighting, and multi-sensory stimulation of Jasmine scent and RED color lighting. The result of this study, at multi-sensory stimulation of Jasmine scent and RED color lighting, relative <TEX>$S{\alpha}$</TEX> wave, SEF50, <TEX>$SMR/{\theta}$</TEX> and SDNN were revitalized, and both sides <TEX>${\alpha}$</TEX> wave asymmetry index, stress index, fatigue degree, and HRT were decreased. Also, Viba image of tension/anxiety and stress were declined. Therefore multi-sensory stimulation of Jasmine scent and RED color lighting effects to increase the Neuro-energy like amenity, productivity of work efficiency, and concentration.

실내 온도가 뉴로에너지에 미치는 영향에 관한 연구

본 연구는 상대습도 50[RH%], 조도 1,000[Lux] 및 기류 속도 0.02[m/sec]의 동일한 조건의 항온 항습실에서 온도를 18, 23, 25, 28 및 <TEX>$31[^{\circ}C]$</TEX>로 변화를 주어 EEG, HRV 및 바이브라이미지를 비교 분석하였다. 실험 결과, 온도 <TEX>$25[^{\circ}C]$</TEX>에서 상대 <TEX>$M{\alpha}$</TEX>파, 상대 <TEX>$M{\beta}$</TEX>파, <TEX>$\frac{SMR}{\theta}$</TEX> 및 SDNN은 활성화되었으며, <TEX>${\alpha}$</TEX>파의 비대칭지수 <TEX>$A_2$</TEX>, HRT, 스트레스지수 및 피로도는 감소하였다. 따라서, 온도 <TEX>$25[^{\circ}C]$</TEX>가 쾌적성, 생산성 및 집중력 등과 같은 뉴로에너지 향상에 효과적인 것을 알 수 있었다. In this study, EEG, HRV, and Vibra image were compared and analyzed in the environmental test room due to variation of temperature. The condition of the environmental test room was in relative humidity 50[RH%], air current speed 0.02[m/s] and illuminance 1000[lux] with setting up different temperatures from <TEX>$18[^{\circ}C]$</TEX> to <TEX>$31[^{\circ}C]$</TEX>. At temperature <TEX>$25[^{\circ}C]$</TEX>, relative <TEX>$M{\alpha}$</TEX> wave, relative <TEX>$M{\beta}$</TEX> wave, <TEX>$\frac{SMR}{\theta}$</TEX>, and SDNN were revitalized, and both sides <TEX>${\alpha}$</TEX> wave asymmetry index <TEX>$A_2$</TEX>, HRT, stress index, and fatigue degree were decreased. Therefore, it was found that temperature <TEX>$25[^{\circ}C]$</TEX> effects to increase the Neuro-energy like amenity, productivity, and concentration.

생산성향상을 위한 음원의 a지수에 관한 연구

In this study, have researched 'a' index from three sound sources, effects on subject and finding optimal 'a' index, which can improve subject's stability, concentration and productivity. Check the health status of subjects who were selected 5 male and 5 female university students, and the period of this experiment was about two months. It were measured each subject's EEG, HRV and vibra image to analyze transition of stability, concentration, stress and heart beat. The results was measured in an environmental test room of temperature 25 (℃), the relative humidity 50 (%), illuminance 1,000 (lux) and air current speed 0.02(m/sec) with 'a' index of three sound sources which are a=1.106, a=1.749 and a=2.227. Results in a = 1.106 compared to before exposure, relative Sα wave, relative  wave and relative  wave have been revitalized, asymmetry index, stress and HRV have been decreased. Thus, to increase stability, concentration and productivity, also to decrease stress, changes in sound source of a=1.106 was found to be the most effective.

불쾌적한 실내 환경에서 쾌적성 향상을 위한 음원서비스 모델링

In this study, the three sounds effects on subjects due to EEG type, and it researched to find optimal sound to increase their amenity and productivity. EEG and HRV were compared and analyzed in the environmental test room by classifying subjects into two type: A and B. The condition of the environmental test room was in temperature 31[℃], relative humidity 50[RH%], air current speed 0.02[m/s] and illuminance 1000[lux] with setting up three different sounds which are U type sound, V type sound and Z type sound. The result of this study, at U type sound for A and B type, relative Mα wave, relative Mβ wave and SEF50 were revitalized. Also at Z type sound for A and B type, stress index, fatigue degree and HRT were decreased and SDNN was revitalized. Therefore U type sound is very effective to increase amenity, productivity and concentration, and Z type sound is very effective to decrease stress and fatigue degree.

습도 변화에 따른 뇌파 기반 생체신호 변화에 관한 연구

Subjects with 0.7[clo]"s amount of clothing were estimated on their thermal comfort, concentrativeness, heart rate variability, stress and fatigue degree when given variation in relative humidity to 30, 40, 50, 60, 70, and 80[RH%], in an environmental test room of temperature 25[℃], illumination 1000[lux] and air velocity 0.02[m/sec], by using EEG, learning ability and HRV. At the result, it was at 50∼60[RH%] of relative humidity that subject"s thermal comfort and concentrativeness were at the highest while stress were at the lowest, and it was at 60[RH%] of relative humidity that heart rate variability was most stabilized. It was found that when temperature and humidity of the environmental test room are at 25[℃] and 50∼60[RH%], subject"s productivity and psychological state are least affected.

뇌파유형별 향기에 따른 인체의 심리적 및 생리적 차이 비교

본 논문에서는 3가지 향기가 뇌파유형에 따른 피험자에게 미치는 영향과 피험자의 쾌적성 및 생산성을 향상시킬 수 있는 최적의 향기를 찾기 위한 연구를 하였다. 피험자들을 A타입과 B타입으로 분류하여 뇌파(EEG), 학습능력 및 심박동변이(HRV)를 측정하여 쾌적성, 집중력, 스트레스 및 심장박동의 변화를 분석하였다. 항...

High Energy-Saving DX (Direct Expansion) System for Automobile Environmental Test Room

High Energy-Saving DX (Direct Expansion) System for Automobile Environmental Test Room

조도 변화에 따른 뇌파 기반 생체신호 변화에 관한 연구

By using EEG and HRV, subjects were estimated on their psychological and physiological reaction when reading psychrometric chart in 7 point century font, in an environmental test room in the condition of temperature 25[℃], relative humidity 50[RH%] , air current speed 0.02[m/sec], giving variation in illuminance to 0.1, 300, 600, 1000, 1300 and 1600[lux]. As a result, it was at 1300[lux] that absolute α wave, SMR, SDNN were most vitalized, and also both sides α wave asymmetry index, SEF50, HRT, stress and fatigue degree were at the lowest. It was found that a certain illuminance which minimizes psychological stress and fatigue degree while enhancing concentration and task achievement stably does exist. <BR>

A simplified calculation method for estimating heat flux from ceiling radiant panels

In this paper, we have developed a calculation method for estimating heat fluxes from ceiling radiant panels, using pipe density on panels and the temperature difference between the room air and the supply water. We then measured heat fluxes from panels in an environmental test room. After comparing the values estimated by our calculation method to the experiment's data, the calculated values closely match the values obtained from experiments, which means that this calculation method is practical in estimating the radiant panel performance in the design phase.

STUDY ON ENERGY SAVING FLOOR HEATING SYSTEM USING AIR TO WATER HEAT PUMP

This paper describes thermal characteristics of a water flow type floor heating system using heat pumps. An experimental system is constructed in an environmental test room. It has a heating room with a floor area of 11.58 m2 and a heat loss coefficient of 2.35 W/(m2·K). The heat balance in the experimental system is observed. Higher efficiency of space heating can be seen at cases using floor heating panels with a thinner top layer and lower thermal resistance materials. These panels also show adaptive room temperatures above 20°C even at a lower water temperature about 30°C. The result reveals that such system may be a possible solution to provide energy saving as well as thermal comfort by the use of heat pumps.

COMPARISON BETWEEN THE CALCULATION METHOD FOR ESTIMATING HEAT FLUXES OF RADIATION AND CONVECTION OF CEILING RADIANT PANELS AND EXPERIMENT DATA

In this paper, we have developed a calculation method for estimating heat fluxes of radiation and convection of ceiling radiant panels, using piping density in panels and the temperature difference between the room and the supply water. And we have measured heat fluxes of panels in some cases in an environmental test room. By comparing the values estimated by the calculation method to the experiment data, the calculated values closely match the values obtained from experiments, which means that this calculation method is practical in estimating the radiant panel performance in the design phase.

Displacement ventilation environments with chilled ceilings: thermal comfort design within the context of the BS EN ISO7730 versus adaptive debate

The current design standard BS EN ISO7730 [Moderate thermal environments—determination of the PMV and PPD indices and specification of the conditions for thermal comfort, International Standards Organisation (1995)] is based upon the work of Fanger, and essentially comprises a steady-state human heat balance model that leads to a prediction of the sensation of human thermal comfort for a given set of thermal conditions. The model was derived from laboratory-based measurements conducted in the mid-1960s in relatively ‘conventional’ environments. However, a chilled ceiling operated in combination with displacement ventilation represents a more sophisticated environment as compared with the original conditions in which the Fanger model was derived. This raised a question about the applicability of the current standard when designing for thermal comfort in offices equipped with chilled ceiling/displacement ventilation systems. This paper presents findings from an EPSRC-funded study that sought to answer the above question. Human test subjects (184 in total) carried out sedentary office-type work in a well-controlled environmental test room that simulated an office fitted with the above system. Measurements of environmental variables were taken at a number of locations near the subjects, each of whom wore a typical office clothing ensemble. The reported thermal comfort sensations were compared with values predicted from BS EN ISO7730 over a range of system operating conditions. It was shown that the current standard BS EN ISO7730 may be used, without modification, when designing for the thermal comfort of sedentary workers in offices equipped with chilled ceiling/displacement ventilation systems. These findings are interpreted within the context of a proposed modification to thermal comfort design standards that includes adaptive effects, and the influence of BS EN ISO7730 on the development of other radiant surface/displacement ventilation configurations is discussed.

Energy routing through a controlled environmental space

Responses to changes of energy input to an enclosure are exponential in nature. The time scales are characterised by active (heating) and cooling (passive) time constants. The time constants can be evaluated from room construction parameters. Heating and cooling paths are followed sequentially rather than simultaneously. A method for predicting heating and cooling trajectories is presented. Verification of the proposed procedure is through reproduction of time-temperature records of an environmental test room for which energy input was by skirting.

Mode-Dependent Time Constants in Three Forms of Space Heating

The majority of published literature on system dynamics of space heating assumes that the constants in the exponential models for heating (active) and cooling (passive) are equal. Reports by Roots and his co-workers show that in one form of space heating the active and passive constants are not equal. This paper presents data from rigidly controlled experiments in an environmental test room under three forms of space heating. Active and passive time constants are reported for baseboard heating, ceiling cable heating, and forced air heating. Explanations are advanced for differences noted.

Comparison of heat stress indices.

Temperature, humidity and radiant heat in an environmental test room were varied over wide limits while five heat stress indices were measured simultaneously: Effective Temperature, Effective Temperature Corrected for Radiation, Wet Bulb Globe Temperature, Heat Stress Index, and Wet Globe Temperature. Regression equations based on 34 tests for the five indices showed them to be interrelated at probabilities exceeding 99%. Similar tabulations were prepared from published data for other indices. An evaluation of the indices revealed that Wet Bulb Globe Temperature and Wet Globe Temperature are best suited to hot work situations where radiant energy is present. For hot, moist conditions, the Effective Temperature is the preferred index.