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이원섭,김신우,이형철 한국감성과학회 2018 감성과학 Vol.21 No.4
Although accurate time perception is necessary to properly respond to the environment, it was discovered that non-temporal features also affect time perception. Previous studies have identified various factors that affect time perception, but there was no attempt to directly investigate the possible effects of the distance between participants and the stimuli on time perception. The current study examined the effects of viewing distance on time perception, by considering the retinal, physical, and perceived size of the stimuli. The viewing distance had no effect when either the physical size or the perceived size of the stimulus was the same. Viewing distance was found only to have an effect when the retinal size of the stimulus was the same. This effect might be a size effect rather than a distance effect because as the viewing distance increases the size should also increase to maintain the retinal size. These results imply that temporal perceptual constancy is preserved irrespective of the viewing distance, when distance information is not limited. 인간이 외부 환경에 하게 응하기 해서는 정확한 시간 지각이 필요함에도 불구하고 다양한 비 시간적 (non-temporal) 특성들이 시간 지각에 영향을 주는 것으로 나타났다. 그동안 시간 지각에 영향을 주는 다양한 요인들이 검증되었지만 참가자와 자극 간의 거리가 시간 지각에 영향을 주는지 직접 검증한 연구는 없다. 본 연구는 자극의 망막상 크기, 물리 크기, 지각된 크기를 고려하여 관찰 거리가 시간 지각에 미치는 영향을 검증하였다. 연구 결과, 자극의 물리적 크기 및 지각된 크기가 동일한 실험에서 관찰 거리의 효과가 나타나지 않았으며, 자극의 망막상 크기가 동일한 실험에서만 관찰 거리의 효과가 나타났다. 이는 자극의 망막상 크기가 동일한 경우, 관찰 거리가 증가할수록 자극의 물리적 크기 또한 커지기 때문에 자극의 크기가 시간 지각에 영향을 준 결과일 수 있다. 이러한 실험 결과는 정보가 제한되지 않는 경우에 관찰거리가 변화하더라도 대상의 지속시간이 항상성 있게 지각될 수 있음을 시사한다.
산처리(酸處理)에 따른 상아질(象牙質)에 대한 Glassionomer Cement의 접착강도(接着强度)에 관(關)한 실험적(實驗的) 연구(硏究)
이원섭,민병순,최호영,박상진,Lee, Won-Seob,Min, Byung-Soon,Choi, Ho-Young,Park, Sang-Jin 대한치과보존학회 1988 Restorative Dentistry & Endodontics Vol.13 No.1
The purpose of this study was to evaluate the bond strength of glassionomer cement against cut dentin surface which was treated with various surface cleaning agents. 48 freshly extracted human 3rd molars were ground flat through the enamel into the dentin using 600 grit silicone carbide paper under a flow of water. The were divided into four groups by the following cleaning procedure on cut dentin surface; Group I : No surface treatment after grinding with 600 grit silicone carbide paper as control group Group II : Surface treatment with 50% citric acid for 30 seconds. Group III : Surface treatment with 37% phosphoric acid for 30 seconds. Group IV : Surface treatment with 10% poly acrylic acid for 30 seconds. The specimens in 4 groups were immersed in distilled water at $37^{\circ}C$ for 24 hours before testing after cleanising with water-spray and drying with air. Bond strength was measured with Instron Universal Testing Machine (Autograph S-100, Shimadzu, Kyoto, JAPAN). The results were as follows: 1. The bond strengths of group II, III & IV were not seemed to be shown more significant improvement than a group I. 2. The bond strengths in groups which were treated with 50% citric acid, 37% phosphoric acid and 10% polycrylic acid, were ranked 24.70kg/$cm^2$, 22.02kg/$cm^2$ and 31.13kg/$cm^2$, but its difference was not significant, statistically.
Ice Ball을 이용한 빙축열조 내의 열유동 특성에 관한 연구
이원섭 한국기계기술학회 2015 한국기계기술학회지 Vol.17 No.2
The study on ice thermal storage system is to improve total system performance in actual air-conditioning facilities. This paper deals with experimental research to observe the characteristics of heat flow and the effect of ice thermal storage in case of three sizes of ice ball, which are included identification of ice thermal extraction. Diameters of three ice ball was 103mm, 96mm, and 76mm is equivalent to 0.45, 0.50 and 0.55 in porosity respectively. Also inlet geometric parameters are the perforator and distributor. Flow rate of brine were 2LPM, 4LPM and 6LPM and the temperature difference in dynamic parameter are 8℃, 10℃ and 12℃. Flow rate of brine used the liter per minute(LPM) for liquid measurement applications. The effect of brine flow rate on efficiency increased as the temperature difference and porosity increased. An adaption of a long-term storage in case of smaller porosity(ɛ=0.45) was available through experiments of outlet temperature responses.