• 한국치위생학회지
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• 제19권6호
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• pp.963-972
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• 2019

Objectives: This study analyzed the relationship between BMI (body mass index), perceived health status, and oral health behaviors of schoolgirls. Methods: This study utilized data from the 13th (2017) Korea Youth Risk Behavior Web-Based Survey. A total of 29,337 schoolgirls were analyzed. Statistical analysis was performed using PASW Statistics 21.0 (SPSS Inc., Chicago, IL, USA). Results: Compared to the obese group, the rate of being recognized as healthy was 1.882 times higher in the normal-weight group and 1.623 times in the underweight group. The rate of using supplementary oral hygiene devices was 1.383 times higher in the underweight group and 1.091 times in the normal-weight group than in the obese group. Compared to the obese group, the experience rate of the sealant was 1.407 times in the underweight group. Compared to the obese group, the scaling experience rate was 1.282 times higher for the underweight group and 1.205 times for the normal-weight group. Conclusions: These results suggest that individual health behaviors are interrelated. There is a need for an integrated approach in the planning and implementation of future health promotion strategies, and it would be useful to design a program that considers health characteristics such as BMI.

• 디지털융복합연구
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• 제14권12호
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• pp.537-544
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• 2016

본 연구의 목적은 기초 수급자들을 대상으로 실시하고 있는 노인들의 불소도포 및 스켈링 사업을 통하여 그들의 구강건강 상태와 구강건강 관련 행태를 살펴보고 잔존 치아 수와의 관련성에 대하여 조사하고자 한다. 65세이상 기초 수급자 노인 660명을 대상으로 자기기입식 설문조사를 시행하였고, 구강검진을 통하여 틀니사용 유무와 잔존 치아 수 등을 조사하였다. 연령이 증가함에 따라 잔존 치아 수는 줄어들었으며, 성별, 연령, 구강위생용품의 사용, 자가 구강상태 진단, 점심 식사 후 칫솔질 유무에 따라서 잔존 치아 수에 차이가 나타났고 통계적으로도 유의하였다(p<0.05). 잔존 치아 수는 대상자 개인의 구강 예방에 대한 관심과 노력으로 예방이 가능하다. 따라서 노인들의 구강건강 행태가 잔존 치아 수에 미치는 융복합적 용인을 샆펴보고, 취약계층에 대한 예방 진료의 확대와 보건관리의 제공을 유지하기 위한 구강관리 프로그램이 지속적으로 제공되었으면 한다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2010년도 추계 학술발표회 3차
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• pp.55-60
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• 2010

Rockfill zones in CFRD consist typically of large granular materials, usually the maximum particle size up to several meters, which makes laboratory testing to determine the mechanical properties of rockfill difficult. Commonly, the design strength of the rockfills is obtained by scaling down the original rockfill materials and performing laboratory strength tests for the reduced size materials. The objective of the present study is to investigate the effect of particle size on the shear behavior and the strength for granular materials. A series of large-scale triaxial tests was conducted on large granular materials with the maximum particle size varying from 20 to 50mm. The test results showed that overall shear behaviors were similar between the samples with different particle sizes while there were slight differences in the magnitudes of the peak shear stress between the samples. In addition, a simulation of the granular material with the max. particle size of 20mm was performed using DEM code, $PFC^{2D}$, and compared with the test results. The deviatoric stress versus strain behaviors of experimental and numerical tests were found to be matched well up to the peak stress state.

• Bulletin of the Korean Chemical Society
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• 제16권9호
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• pp.873-885
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• 1995

The local structural and thermodynamical properties of blends A-B/H of a diblock copolymer A-B and a homopolymer H are studied using the polymer reference interaction site model (RISM) integral equation theory with the mean-spherical approximation closure. The random phase approximation (RPA)-like static scattering function is derived and the interaction parameter is obtained to investigate the phase transition behaviors in A-B/H blends effectively. The dependences of the microscopic interaction parameter and the macrophase-microphase separation on temperature, molecular weight, block composition and segment size ratio of the diblock copolymer, density, and concentration of the added homopolymer, are investigated numerically within the framework of Gaussian chain statistics. The numerical calculations of site-site interchain pair correlation functions are performed to see the local structures for the model blends. The calculated phase diagrams for A-B/H blends from the polymer RISM theory are compared with results by the RPA model and transmission electron microscopy (TEM). Our extended formal version shows the different feature from RPA in the microscopic phase separation behavior, but shows the consistency with TEM qualitatively. Scaling relationships of scattering peak, interaction parameter, and temperature at the microphase separation are obtained for the molecular weight of diblock copolymer. They are compared with the recent data by small-angle neutron scattering measurements.

• Nuclear Engineering and Technology
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• 제53권11호
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• pp.3580-3596
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• 2021

An integral test facility, PILLAR, was commissioned, aiming to provide valuable experimental results which can be referenced by system and component designers and used for the performance demonstration of liquid-metal-cooled, passive small modular reactors (SMRs) toward their licensing. The setup was conceptualized by a scaling analysis which allows the vertical arrangements to be conserved from its prototypic reactor, scaled uniformly in the radial direction achieving a flow area reduction of 1/200. Its final design includes several heater rods which simulate the reactor core, and a single heat exchanger representing the steam generators in the prototype. The system behaviors were characterized by its data acquisition system implementing various instruments. In this paper, we present not only a detailed description of the facility components, but also selected experimental results of both steady-state and transient cases. The obtained steady-state test results were utilized for the benchmark of a system code, achieving a capability of accurate simulations with ±3% of maximum deviations. It was followed by qualitative comparisons on the transient test results which indicate that the integral system behaviors in passive LBE-cooled systems are able to be predicted by the code.

• 치위생과학회지
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• 제16권6호
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• pp.472-480
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• 2016

본 연구는 성인 110명을 대상으로 스트레스와 스트레스 대처방식에 따른 치주건강상태를 파악하고 구강건강행위의 통제효과를 분석하여 다음과 같은 결론을 얻었다. 대상자의 스트레스 수준은 잠재적 위험군이 64.5%, 고위험군이 19.1%, 건강군이 16.4%였고, 스트레스 대처방식은 적극적 방식 2.46점, 소극적 방식 2.32점이었다. 구강건강행위인 칫솔질 횟수는 평균 2.45회, 칫솔질 시간은 2분, 잠자기 전 칫솔질을 하는 사람은 69.1%, 스켈링 경험이 있는 사람은 89.1%였다. 치면세균막지수는 73.45점, 평균 치은염지수는 1.30점이었으며, 치주낭보유분악수는 평균 2.83개로 나타났다. 대상자의 특성과 스트레스 및 대처방식을 독립변수로하고 구강건강행위를 통제변수로 한 위계적 다중회귀분석 결과에서 치주낭보유분악수는 비정규직 및 기타가 정규직보다 적었으며(${\beta}=-0.348$), 스켈링 경험이 많을수록 적어졌고(${\beta}=-0.253$), 연령이 증가할수록 많아지는 결과(${\beta}=0.244$)를 나타냈다(p<0.05). 이를 통해 일상스트레스는 치주상태에 직접적 영향을 미치지 않으며, 구강건강행위 중 스케일링은 치주상태에 강한 통제효과가 있음을 확인하였다. 따라서 치주상태는 다양한 요인에 영향을 받을 수 있지만 스케일링을 규칙적으로 시행할 경우 치주질환의 위험을 감소시킬 수 있으므로 규칙적인 스케일링을 받을 수 있도록 다각적인 지도와 국가적인 지원이 지속적으로 이루어져야 할 것이다.

• 한국지반공학회논문집
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• 제22권5호
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• pp.59-67
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• 2006

동일한 흙으로 조성된 모형지반에 대하여 1-g 모형실험과 원심모형실험을 수행하고 그 결과를 비교하였다. 원형지반은 10m 두께의 수평하고 느슨한 포화 사질토 지반으로 가정하였다. 1-g 모형실험은 1/20 축소모형, 원심모형실험은 1/40 축소모형을 이용하였다. 원심모형실험의 경우 점성유체를 사용하여 동적시간에 대한 상사비와 과잉간극수압소산시간에 대한 상사비가 동일하도록 하였다. 원심모형실험의 계측결과는 원형지반의 거동으로 가정하였다. 그리고, 1-g모형실험에 정상상태개념 및 두 가지 시간상사비 등을 적용하여 원형지반의 거동을 모사하고자 하였다. 동일한 위치에서의 과잉간극수압, 지반가속도 그리고 지표 침하량 등을 계측하여 비교하였다. 실험결과 지반의 투수계수가 작아서 진동 중 과잉간극수압 소산의 영향이 작고, 소산시간상사비를 적절하게 결정하면 1-g 모형실험으로부터 원형지반의 과잉간극수압 거동을 모사할 수 있는 것으로 나타났다.

• 한국치위생학회지
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• 제10권4호
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• pp.705-715
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• 2010

Objectives : This study is aimed to seek how to promote oral health care by leading the clients with dental fears to change their behaviors in oral hygiene care based on the analysis of the relationships between the dental fears and oral health care behaviors of the clients who visit the Dental Hygiene Education Room. Methods : This study analyzed the 361 dental hygiene records of the subjects with finished treatment and accurate records among a total of 370 clients who had received dental hygiene care at the Dental Hygiene clinic in Y University from March 2007 till June 2009. According to their general features, the study analyzed whether they had any dental fears and why such fears occurred and conducted Chi-square test to compare their oral hygiene care experiences and behaviors with dental fears. Data analysis was made using the SPSS 12.0K for Window, with level of significance set at 0.05. Results : 1. In terms of dental fear or non-fear, the comparison by gender showed that women had a higher level than men, with 76 women(47.2%) answering yes; the comparison by age showed that the age group of 30 years old or older had a higher level than other groups. 2. In terms of dental fear reasons, "the past pain experiences" recorded 34.2%, showing the highest rate. 3. In addition, dental fears had influences on regular dental examination, scaling and dental hygiene education and the subjects without dental fear showed higher levels in terms of tooth-brushing frequency and time. Conclusions : To control "the past pain experiences", future dental treatment should place priority on preventive treatment and get clients to cope with pains through the preliminary education with pains. Besides, to make an effective oral health care of the clients with dental fears, dental hygienists should control the fears of the clients and perform an appropriate oral health care for them using the communication techniques to make friendly and trustworthy impressions.

• 대한치과기공학회지
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• 제38권1호
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• pp.51-61
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• 2016

Purpose: This study was conducted to find oral health and eating attributes relating to the maxillary anterior teeth color and examine the meaning. Methods: This study aims to prepare the basic data of the teeth color by measuring analyze mode using the color of the maxillary anterior teeth(maxillary central incisor, lateral incisor, canine) of the dental patients as the dental colorimeter. Also, This researcher explained the purpose of this study to dental patients and got agreement of 111 patients(50 men and 61 women). We conducted the survey from 2 March to 25 May, 2015. So the color of total 333 teeth was examined, and eating habit attributes and oral health behaviors were researched. Results: Lightness(L) was significantly high in female compared to male(12, p<0.05), the more often intake of red pepper paste decreased(11, 13) lightness. and the brightness of the 31-40 age group was significantly higher(12, p<0.05) than the group under the age of 20. Red chroma(a) was significantly low in over 50 age group compared to the group under the age of 20(12, p<0.05), and the red chroma(a) of the "received periodic scaling" group was significantly lower(13, p<0.01) than the other group.

• 한국콘텐츠학회논문지
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• 제13권2호
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• pp.198-210
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• 2013

삼차원 입체 영상으로 TV 프로그램을 시청할 때 나타날 수 있는 콘텐츠의 영향을 살펴보았다. 여러 나라에서 삼차원 영상 산업을 일으키기 위한 방법으로 성인물을 사용하고 있기 때문에 선정적인 콘텐츠의 영향을 우선적으로 살펴보았다. 동일한 콘텐츠일지라도 영상의 재현 방식(2D와 3D)의 차이에 따라 시청자 경험이 달라지는지를 살펴보기 위해 영상 시청 후 실재감과 각성, 성적 태도의 변화를 관찰하였다. 실험 결과 삼차원 입체 영상을 본 참가자는 이차원 영상으로 시청한 참가자에 비해 영상의 실재감을 더 높게 지각하였으며, 보수적인 성적 태도를 가지는 경향성을 보였다. 이 결과는 삼차원 영상의 입체감이 선정적인 콘텐츠의 지각과 수용에 영향을 줄 수 있다는 것을 의미한다. 이 연구 결과는 3D TV 방송의 시청 안정성을 위한 권고안을 제작하는데 도움을 줄 수 있을 것이다.