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Illuminance Effects Affecting to Cognitive Ability of the Elderly (고령자의 인지력에 미치는 조도의 영향)

  • Kim, Myung-Ho
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.20 no.3
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    • pp.507-512
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    • 2019
  • To study how illuminance affects cognitive ability of the elderly, the elderly's EEG, concentration, HRV and vibra image were measured in a test room with temperature $25[^{\circ}C]$, relative humidity 50[RH%] and air flow speed 0.02[m/sec] by varying illuminance to 100[lux], 300[lux], 600[lux], 1000[lux] and 1500[lux]. Ten active elderly males were selected as subjects. Experiment condition was fixed as 1met of activity amount where the subject is seated and relaxed with cloth amount of 0.7clo. As a result, 1000[lux] was found out to be the most pleasant illuminance for the elderly, because $M{\beta}$ increased by 66.35%, and $S{\alpha}$ increased by 31.57% when the elderly was under 1000[lux] of illuminance. Also, concentration under 1000[lux] increased by 8.83% compared to 100[lux], and the pattern of concentration maintained uniformly. SDNN increased by 74.94% under 1000[lux] compared to 100[lux]. Nervousness decreased by 97.23% under 1000[lux] compared to 100[lux]. Moreover, HRT notably increased and aggression remarkably decreased under illuminance of 1000[lux]. Thus, based on the fact that comfort, concentration and heart stability of the elderly reach the highest under 1000[lux], it is determined that the illuminance has to be considered foremost in designing the elderly's welfare facilities to raise their safety and level of independence.

Effects of Inhalation of Wood Essential Oil (Chamaecyparis obtusa) on the Change of Concentration and Mood States (편백 정유향의 흡입이 주의집중력과 기분상태의 변화에 미치는 영향)

  • Seong, Hyeon Su;Goh, Eurah;Choi, In Hwa
    • Journal of Forest and Environmental Science
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    • v.30 no.1
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    • pp.62-70
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    • 2014
  • The principle purpose of this research is to figure out whether the inhalation of Wood Essential oil (Chamaecyparis obtusa) affect not only human beings' concentration for surroundings but also change as to status of feelings. total number of subjects for this experimental are determined to be 66 (men 44 and women 22) among 85 adults who agreed to participate in this experiment after excluding 19 participants who were not able to smell scent due to flu and nasal inflammation. After both experimental group and control group being measured referring to their status of mood such as concentration, depression, vigor, fatigue, confusion, tension and anger, the experimental group is offered to get a piece of cotton that includes Wood Essential oil and they are asked to inhale it for 5 min. On the other hand, control group is offered to wait for the experimental group finishing inhaling wood Essential oil for 5 min. After 5 min, the status of mood from both groups were measured again. simultaneously, I conducted a survey targeting experimental group to see what their preferences are like regarding scent of wood essential oil. The experiment shows that the status of experimental group's concentration is improved about 0.94 point when compared to control group's. Moreover, Total mood disturbance is lower than control group's. Therefore it is proved that the inhalation of wood Essential oil alleviates overall status of mood. according to the analyses result of favor to scent for wood essential oil from experimental group, some of them who were positive got much better improvement when it comes to concentration and far more relieved on their feelings than those who weren't. Based from this result, it is definitely confirmed that there is a Phytoncide's psychophysiological effect which transcends the Placebo Effect generated by Phytoncide's positive image.

A Study on the Pseudo-Scientifism in Architectural Design in the First Machine Age (제1기계시대 건축디자인에서의 유사과학주의에 관한 연구)

  • 김원갑
    • Korean Institute of Interior Design Journal
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    • no.26
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    • pp.49-56
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    • 2001
  • Science, technology and machine aesthetics were the main theme of architectural design in the first machine age. Modern architecture used the theory of science as its framework. But the theory of science was used not as a professional way, but as a pseudo-scientific way by modern architects. It was because that modern architects relied on the spiritual, mystical realm of science and mathematics. Moreover, the avant-garde movement in modernism used the theory of science and mathematics for its complicated and ailenated nature and scientific image. The pseudo-scientifism in architectural design in the first machine age was expressed mainly as a concentration on the 4th dimensional space and the use of symbolic image of science and technology.

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Experiment of Characteristic Diffusion Time of Viscoelastic Fluid by Particle Image Velocimetry (PIV를 이용한 점탄성 유체의 특성 확산시간에 대한 측정)

  • 전찬열
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.3 no.4
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    • pp.251-256
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    • 2002
  • The average diffusion time of a polyacrylamide solution was determined by measuring the terminal velocities of the falling balls. The diffusion time increased as the polyacrylamide concentration increased. The PIV (Particle Image Velocimetry) system was employed to visualize the flow phenomena around balls. For a time interval of 30 seconds in the 2000 wppm, velocity vectors were larger than in case of 0 seconds, 40 seconds and 50 seconds in the falling ball. However, in the Newtonian fluid, flow vsualization around balls were performed at both upstream and downstream of the falling ball.

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Automatic Counting of Yeast Cells in Baker's Yeast Culture Using PC Camera and Conventional Light Microscope (PC카메라와 일반광학현미경을 이용한 빵효모 배양액의 효모세포 자동계수)

  • Lee, Hyeong-Choon
    • KSBB Journal
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    • v.26 no.1
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    • pp.87-91
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    • 2011
  • Automatic counting of yeast cells in baker's yeast culture was tried using a conventional light microscope equipped with a pc camera. Relatively good binary image was obtained by using white LED as microscope light source, but uneven brightness distribution in original image hindered counting accuracy. A block binarization method using local thresholds proportional to local brightnesses was used to get improved binary images. The brightnesses of the blocks were expressed as the value component in HSV color model. Good quality binary images were obtained by binarization on $8{\times}6$ blocks of original images and connected-component labelling of the binarized images produced reliable counting results in the concentration range $1.4{\times}10^5/mL{\sim}1.4{\times}10^7\;cells/mL$.

Electrically controllable polymer-dispersed liquid crystal (전기적 스위칭이 가능한 고분자 분산형 액정 제작 및 동적 홀로그램 기록 특성)

  • 성기영;경천수;이영락;최병철;곽종훈;최옥식;이윤우
    • Korean Journal of Optics and Photonics
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    • v.10 no.6
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    • pp.494-499
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    • 1999
  • We report on the results of holographic transmission grating that can be controlled by the applied AC electric field. We have fabricated a polymer-dispersed liquid crystal material that composed of multifunctional acrylate monomer blended with the liquid crystal mixture E7. To investigate an electro-optic properties of fabricated HPDLC, diffraction efficienties (DE) are measured as a fuction of applied electric field and density of liquid crystal. Maximum DE of about 70% is obtained about 30 wt% of LC concentration at a zero field. We have also shown that optical image was recorded in the tllm, and then the reconstructive image was switchable with the applied electric fields. ields.

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Behavior Characteristics of Density Currents Due to Salinity Differences in a 2-D Water Tank

  • Lee, Woo-Dong;Mizutani, Norimi;Hur, Dong-Soo
    • Journal of Ocean Engineering and Technology
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    • v.32 no.4
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    • pp.261-271
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    • 2018
  • In this study, a hydraulic model test, to which Particle Image Velocimetry (PIV) system applied, was used to determine the hydrodynamic characteristics of the advection-diffusion of saltwater according to bottom conditions (impermeable/permeability, diameter, and inclination) and the difference of the initial salt. Considering quantitative and qualitative results from the experiment, the characteristics of the density current were discussed. As an experimental result, the advection-diffusion mechanism of salinity was examined by the shape of saltwater wedge and the flow structure of density currents with various bottom conditions. The vertical salt concentration obtained from the experiment was used as quantitative data to calculate the diffusion coefficient that was used in the numerical model of the advection-diffusion of saltwater.

Influence of Cellulase Treatment Conditions on Backstaining of Indigo Denim (셀룰라제 처리조건이 인디고 데님의 재오염에 미치는 영향)

  • 차옥선;양진숙
    • Journal of the Korean Society of Clothing and Textiles
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    • v.20 no.5
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    • pp.841-851
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    • 1996
  • The purpose of this study is to investigate the backstaining generated during cellulase treatment for indigo-dyed denim. The results were as follows. 1. High generating conditions of the backstaining were as same as best conditions for cellulose activity (temperature at 6$0^{\circ}C$, pH at about 4.5~5.5, treatment time at 40 min. and enzyme concentration at 2g/l). And also, liquor ratio, sample weight and repeated-use cycle of liquor had influenced on the backstaining. 2. The backstaining was decreased about 30~40% when various additives, that is, surfactant, anti-backstaining agent (C.M.C) and softners were added. 3. A application of image processing on the backstaining evaluation was more effective than method by reflectance, particullarly in out of level fabrics. In image analysis, the backstainings were measured by histogram between 256 gray levels.

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Comparison Study of Image Performance with Contrast Agent Contents for Brain Magnetic Resonance Imaging

  • Lee, Youngjin;Choi, Min Hyeok;Goh, Hee Jin;Han, Dong-Kyoon
    • Journal of Magnetics
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    • v.21 no.2
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    • pp.281-285
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    • 2016
  • The purpose of study was to evaluate SNR and CNR with different contrast agent contents (1.0 mmol/mL gadobutrol and 0.5 mmol/mL gadoterate meglumine) for spin echo (SE) and 3-dimension contrast-enhanced fast field echo (3D CE-FFE) pulse sequences. In this study, we compared the SNR and the CNR between 0.5 mmol/mL gadoterate meglumine and 1.0 mmol/mL gadobutrol according to the concentration of contrast agent in brain MRI. When we compared between SE and 3D CE-FFE pulse sequences, the higher SNR and CNR using 3D CE-FFE pulse sequence can be acquire regardless of contrast agent contents. Also, a statistically significant difference was found for SNR and CNR between all protocols. In conclusion, our results demonstrated that the SNR and CNR have not risen proportionately with contrast agent contents. We hope that these results presented in this paper will contribute to decide contrast agent contents for brain MRI.

조사구간 윈도우 변형을 이용한 PIV에서 보간법 평가

  • Kim, Byeong-Jae;Seong, Hyeong-Jin
    • 한국가시화정보학회:학술대회논문집
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    • 2006.12a
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    • pp.25-35
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    • 2006
  • We have evaluated the performances of the following six interpolation schemes used for window deformation in particle image velocimetry (PIV): the linear, quadratic, B-spline, cubic, sinc, Lagrange interpolations. Artificially generated images comprised of particles of diameter in a range $1.1{\leq}d_p\leq10.0$ pixel were investigated. Three particle diameters were selected for detailed evaluation: $d_p$=2.2, 3.3, 4.4 pixel with a constant particle concentration 0.02 $particle/pixel^2$. Two flow patterns were considered: uniform and shear flows. The mean and random errors, and the computation times of the interpolation schemes were determined and compared.

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