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광을 이용한 2.9% 과산화수소 함유 젤과 첩부제의 치아미백효과 비교
김지혜,방성은,김지영,안재현 한국치위생과학회 2017 치위생과학회지 Vol.17 No.6
The study aimed to compare the whitening efficacy of a strip and gel containing 2.9% hydrogen peroxide, using a tooth whitening light activator. The whitening effect was compared through in vitro and in vivo studies. In the in vitro study, we used stained hydroxyapatite (HAP) specimens as artificial teeth. HAP specimens were made using HAP powder and polyvinyl alcohol solution, and stained by modified Stookey’s method. A whitening gel and whitening strip were applied to the respective specimens for 20 minutes, with a light activator. The color changes were measured using a colorimeter. In the in vivo study, one group (test 1) used the gel with a light activator and the other group (test 2) used a strip with the same activator for 15 minutes a day, for four consecutive days. An organoleptic evaluation using a Vita shade guide and instrumental evaluation using a Shade eye-NCC (Shofu Co., Japan) were performed. The color change values (ΔE*) in the in vitro study revealed the strip with the light activator to be more effective than the gel with the same activator (p<0.001). In the in vivo study, even though there was no significant difference between the groups with respect to the ΔE*, using either the Shade eye-NCC or the Vita shade guide, the change in yellowness (Δb*) was statistically significant (p=0.024). In conclusion, test 2 group that used 2.9% hydrogen peroxide strip with a light activator, showed a tendency towards increased whitening than test 1 group that used the gel with the same activator; however further studies are needed to validate the above finding. 본 연구는 OTC 미백술에서 사용되고 있는 2.9% 과산화수소 함유 젤과 과산화수소 함유 첩부제 제품을 광조사기와각각 혼합 사용했을 때의 실험실 및 임상적 효과를 비교 평가하고자 하였다. 실험실적 평가는 변형된 Stookey's method 를 이용하여 착색시킨 HAP 시편을 이용하여 20분간 각 실험제품을 적용하고 광을 조사하였다. 임상적 평가에서는 하루 15분씩 4일간 각 실험제품과 광조사를 진행하였고, Vita 색조편을 이용한 육안적 평가와 Shade eye-NCC를 이용한기기적인 평가를 진행하였다. 실험실적 평가 결과 과산화수소 함유 첩부제와 광을 사용한 군이 과산화수소 함유 젤과광을 사용한 군에 비해 색조 변화 값(ΔE*)이 유의하게 높게 나타났다(p<0.001). 임상적 평가에서는 Vita 색조편을이용한 육안평가 결과, 첩부제와 광을 사용한 군이 젤과 광을 사용한 군보다 제품 사용 전후 색조 변화 값이 좀 더 큰 경향을 나타내었으나 군간 유의차는 없었다(p>0.05). Shade eye-NCC를 이용한 기기적 평가 결과에서 ΔE*값은 첩부제와 광을 사용한 군이 젤과 광을 사용한 군보다 좀 더 높았으나 군간 유의차는 나타나지 않았고(p>0.05), Δb*값은첩부제와 광을 사용한 군이 유의하게 높게 나타났다(p=0.024). 본 연구에서는 광조사기와 혼합 사용하는 과산화수소 젤 또는 첩부제 형태의 물리적 성상에 따른 치아미백제품의 미백효과 평가 결과 첩부제 형태의 과산화수소 제제가 젤 형태보다 치아미백효과가 높은 것으로 나타났다.
Effects of Intraday Patterns on a Time Series Analysis of the Korean Stock Market Index
김두환,맹성은,방유식,최형욱,차문용,이재우 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.58 No.2
The effects of intraday patterns were considered in a time series analysis of the Korean stock market. One minute tick data from January 2, 2004, to October 30, 2009, on the Korea composite stock price index were studied. The autocorrelation function (ACF) of the absolute return and the probability distribution function (PDF) of returns were calculated by using a time series with the intraday patterns removed. Two methods of eliminating the intraday patterns are suggested: elimination from the index itself and from the absolute returns. The ACF of the absolute return showed a power law with an exponent that did not vary with the method used to eliminate the intraday patterns. Eliminating intraday patterns from the absolute return removed the periodicity of the ACF. However, the periodicity remained if intraday patterns were removed from the index itself. The PDF of returns showed a power law, but its exponents depended on the method of removing the intraday patterns.
Persistent and Survival Properties in a Stock Market Index
이재우,차문용,맹성은,방유식 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.3
We consider the persistent and the survival properties of the Korean stock market index (KOSPI),and investigate the crossing and the persistence probability for a time series of the KOSPI. The crossing probability of the stock index follows a power law, Y (t) ~t−α. The Korean stock market shows weak antipersistent behavior. We also report the survival probability of the stock index. The survival probability S(t) measures the probability of a stock’s price remaining above (or below) a reference value up to a time to + t. We observed that the survival probability in the Korean stock market followed a power law, S(t) ~ -β, where the exponent depended on the reference level. The persistence and the survival of the stock index comes from the correlated memory of the stock index in the market.
경도 치매 환자 보조를 위한 웨어러블 디바이스와 서비스 디자인 연구 -사운드 인터랙션 사례를 중심으로-
김은정,김숙연,방성은,유자은,이혜수 (사)한국커뮤니케이션디자인협회 커뮤니케이션디자인학회 2022 커뮤니케이션 디자인학연구 Vol.79 No.-
The purpose of this study was to help patients with mild dementia use a wearable device using sound interaction to enable both dementia patients and their carers to live independently. Prior to designing the service, the result was derived that sound is closely related to human psychological factors through the analysis of sound interaction. Based on this, a survey was conducted with caregivers and caregivers of dementia patients, and through in-depth interviews, a service was devised to help patients quickly recognize through sound when they are lost or in a dangerous situation. As a final verification, a wearable device that a patient can attach to the body and use as an accessory and an application for caregivers were derived. Through this, the dignity of the patient was taken into consideration by reducing the shame that the patient could feel when wearing the product. In addition, it has increased usability by including the necessary parts when caring for patients. In the future, it is expected that the effectiveness of this product and service will be verified and used in the form of a practical product.