• Survey Research
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• v.11 no.3
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• pp.19-32
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• 2010

This paper discusses how we developed an index for measuring problem gambling severity and determined the cutoff score for identifying addicts. This index uses fewer items than the current index and will be particularly useful for telephone surveys. We selected four items among the nine Korean Problem Gambling Severity Index (K-PGSI) items based on our statistical analysis of a survey of 501 gamblers. We applied this four-item index to a survey of 1,584 adults. The analysis of this survey proved the validity of the reduced index. The sensitivity and specificity of this index was 1.00 and 0.99 respectively, showing again the usefulness of this scale.

• Proceedings of the KOR-KST Conference
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• 2007.05a
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• pp.300-309
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• 2007

본 연구는 신호교차로에서의 딜레마 죤 범위를 산정하고 신호위반 단속의 허용 범위를 분석하는데 있다. 각 교차로 접근로별 조사 자료를 토대로 딜레마 죤의 범위를 산정하였고, 이를 토대로 신호위반 단속에 있어 딜레마 죤의 영향을 최소화 할 수 있는 방안을 제시하고자 하였다. 기존의 딜레마 죤에 관한 연구에서는 인지-반응 시간과 황색신호시간을 초기값으로 적용하였으나 본 연구에서는 해당 교차로의 조사치를 적용하였다. 조사 방법으로 속도조사는 스피드 건을 이용하여 각각의 대상 교차로별 접근로에서 접근 속도 및 통과 속도를 조사하였으며, 운전자의 인지-반응 시간 및 황색신호시간에 교차로를 통과하는 차량조사는 비디오 촬영을 통하여 조사하였다. 이러한 조사된 자료를 토대로 신호위반 단속기준에 맞추어 딜레마 죤에 관하여 분석하였다. 본 연구에서 딜레마 죤은 최소정지거리($d_0$)가 최대통과거리($d_c$)보다 클 때 존재하는 것으로 보았으며, 그 차이만큼의 딜레마 죤이 발생하는 것으로 정의하였다. 이에 신호위반 단속을 함에 있어딜레마 죤의 영향을 최소화 할 수 있는 방안 등을 제시하였다. 그러나 각각의 방안을 개별적으로 적용시킬 경우 문제점이 발생하였다. 이러한 문제점을 해결하기 위해서 자기감응식 루프검지기의 위치를 재조정함에 있어 하나의 루프 검지기를 정지선 이후에 존재함과 동시에 황색신호시간을 재조정하거나, 자기감응식 루프검지기의 작동시간을 재조정하는 방안을 제시하고자 하였다. 본 연구에서는 3개의 교차로를 비교대상으로 선정하여 각각의 교통환경에 따른 접근로별 딜레마죤의 범위를 최소화하기 위한 대안을 제시하였다.

• The Journal of the Korea Contents Association
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• v.12 no.12
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• pp.313-320
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• 2012

A dental treatment room is always exposed to diverse kinds of pathogenic bacteria, and may be a mediating place of cross-infection given being contaminated the interior of a room through several routes in the form of patient's secretion and aerosol. The main agent of preventing cross-infection is a dental hygienist in the dental treatment and the dental treatment room where are scattered about a risk of cross-infection. A dental hygienist needs to have right recognition on infection control before being active as a clinical expert. This infection-control recognition level is influenced from the clinical practice. Accordingly, to survey recognition of infection control, a self-administered questionnaire research was conducted targeting 314 students who are fixed the clinical practice as regular subject in the junior course out of curriculum for the Department of Dental Hygiene at some of 4-year universities. Data collection was performed from December 9, 2011 to February 22, 2012. Except 11 copies of questionnaire with insincere response among the collected materials, 303 copies were finally analyzed by using SPSS WIN 20.0. The following conclusions were obtained. In the infection disease section, both on and off campus showed 4.89 points from 'the importance of recognizing the infections prevention', 4.65 points from 'recognizing the compulsory preventative injection for hepatitis type B', 4.77 points from 'recognizing the necessity of the preventative injection for hepatitis type B', 4.71 points from 'whether practice the prevention in reality or not', and 4.76 points from 'the educational helps to the prevention'. In other words, the section recorded the highest and meaningful points. It is considered to be needed the development in systematic and diverse infection-control educational programs and the differentiated education depending on school year for dental hygiene students.

• Journal of the Korean GEO-environmental Society
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• v.2 no.1
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• pp.37-56
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• 2001

As a preliminary study to establish fracture network model in crystalline rocks, detail investigation on fracture characteristics were performed. Five fracture sets were determined on the basis of regional survey of geological structures and fractures on outcrops. Among the fracture sets, S1 set has the highest density and longest trace length of fractures which was identified on surface in the study area. S4 and S5 sets are composed of foliations and foliation parallel shear joints of gneisses, which are very important sets at the aspect of weighting of fracture length. For characterization of subsurface fractures, detail core logging was performed to identify fractures and fracture zones from five boreholes. Acoustic televiewer logging and borehole geophysical loggings produced images, orientations and geophysical properties of fractures which intersect with boreholes. According to the result of the investigations, subsurface fractures can be grouped as three preferred orientations(B1, B2 and B3), which correspond to S1, S2 and S4/S5 of surface fracture sets, respectively. Actually, B1 set is expected to be intensely developed at subsurface. However, it has low frequency of intersection with boreholes due to its parallel or sub-parallel direction to boreholes. According to the inference of conductive fractures, B1 and B3 sets have possibilities of water flow and their intersection lines are also thought to consist of important conduits of groundwater flow. In particular, faults which are parallel to foliations control major groundwater flow in the study area.

• Journal of Convergence for Information Technology
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• v.9 no.12
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• pp.62-70
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• 2019

The study used cross-lagged path modeling to examine the longitudinal associations between self-esteem and community spirit among adolescents. This is a longitudinal study designed to examine the developmental changes of adolescents' self-esteem and community spirit in Korea. This study used the data collected by the Korean Children and Youth Panel Survey (KCYPS) from 2014 through 2016. Participants were surveyed from the 5^th grade to the 7^th, which belonged to the 1^st elementary school cohort panel of the KCYPS. To be used as the data of this study, children should have all information at 3-time points: the 5^th grade; 6^th grade; 7^th grade. The collected data were analyzed with PSAW 18.0 and AMOS statistical program. The participants in this study were 903 males (51.6%) and 847 females (48.4%). The level of self-esteem was 3.29±.51, 3.19±.55, and 3.15±.57 point at 5^th grade, 6^th grade, and 7^th grade each. The level of community spirit was 3.12±.52, 3.09±.59, 3.15±.55 point respectively. Community spirit from elementary school to middle school is consistently predicted by previous self-esteem. Likewise self-esteem has a significant predictive effect on subsequent community spirit.

• 한국노년학
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• v.30 no.3
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• pp.843-853
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• 2010

The purpose of this study is to find out the characteristics of elderly pedestrian accidents and to suggest policy implications to enhance the level of elderly pedestrian safety. Although much efforts has made to enhance traffic safety environment, pedestrian traffic accidents among elderly population are not significantly decreased. This is mainly because current traffic safety measures do not much consider the characteristics of elderly pedestrians in the aspects of physical and psychological conditions. Main findings from vehicle-pedestrian traffic accident data and survey are as follows. First elderly pedestrians have high probability of traffic accident near crosswalks or cross streets rather than on crosswalk or cross streets. Second they need more green light time for crossing the streets. Third, they feel motor cycles running on the side walk and parked vehicles on the side walk are the most dangerous factors. Forth, general drivers do not have reasonable understanding for the walking behaviors of elderly pedestrians. Fifth, elderly pedestrians frequently need to rest while walking. Sixth, elderly people do not see clearly or understand traffic signs. Finally, many elderly pedestrians experience accidents or inconvenience while walking on the sidewalk.

• Journal of agricultural medicine and community health
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• v.37 no.1
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• pp.23-35
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• 2012

Objectives: The purpose of this study was to investigate the association of the average volume of alcohol consumption and binge drinking with arterial stiffness. Methods: The study population consisted of 5944 community-dwelling healthy adults aged 50 years and older. Average volume of alcohol consumption was calculated and frequency of binge drinking defined as the consumption of 7 or more drinks for men and 5 or more for women on a single occasion, was assessed using a structured interview. High brachial-ankle pulse wave velocity (baPWV), a marker of arterial stiffness, was defined as the highest gender-specific quartile of maximal baPWV distribution in the study population. Results: Compared to never drinkers, the multivariate-adjusted odds ratio (OR) of men who consumed 0.1-10.0, 10.1-20.0, 20.1-40.0, and >40.0 g/day was 0.93, 1.18, 1.38, and 2.36, respectively. The OR was 0.90, 0.97, 1.45, and 1.82 in women consuming 0.1-5.0, 5.1-10.0, 10.1-20.0, and >20.0 g/day, respectively. Binge drinking of <1 day/week (OR=1.66, 95% confidence interval [CI]=1.13-2.42) and ${\geq}1$ day/week (OR=1.61, 95% CI=1.04-2.50) were associated with increased risk for high baPWV in men, and binge drinking of ${\geq}1$ day/week (OR=3.12, 95% CI=1.16-8.34) was associated with increased risk for high baPWV in women. Conclusions: A J-shaped relationship between the average volume of alcohol consumption and high baPWV was observed, suggesting the detrimental effects of heavy alcohol drinking on arterial stiffness. Binge drinking was also significant risk factors for increased arterial stiffness, independently of the average volume of alcohol consumption.

• Composites Research
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• v.36 no.4
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• pp.270-274
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• 2023

The stacking configuration of fiber-reinforced polymer (FRP) composites, achieved via the filament winding process, exhibits distinct variations compared to conventional FRP composite stacking arrangements. Consequently, it becomes challenging to ascertain the influence of mechanical properties based on the typical stacking structures. Thus, it becomes imperative to enhance the mechanical behavior and optimize the interleaved structures to improve overall performance. Therefore, this study aims to investigate the impact of incorporating amorphous halloysite nanotubes (A-HNTs) within different layers of five unique layer arrangements on the low-velocity impact properties of interleaved carbon fiber-reinforced polymer (CFRP) structures. The low-velocity impact characteristics of the laminate were validated using a drop weight impact test, wherein the resulting impact damage modes and extent of damage were compared and evaluated under microscopic analysis. Each interleaved structure laminate according to whether nanoparticles are added was compared at impact energies of 10 J and 15 J. In the case of 10 J, the absorption energy showed a similar tendency in each structure. However, at 15 J, the absorption energy varies from structure to structure. Among them, a structure in which nanoparticles are not added exhibits the highest absorption energy. Additionally, various impact fracture modes were observed in each structure through optical microscopy.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2003.05a
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• pp.259-260
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• 2003

분포가 확대되어 가고 있는 미국자공의 서식지 환경요인과 발아특성을 조사하였다. 그 결과 광의 구배에 따른 기온의 차는 없었으나, 지온의 일교차는 상대조도에 따라 아주 다르게 나타났다. 실생 출현은 100%에서 150개체가 출현하였고, 33%에서는 80개체가 출현하였지만 8%에서는 출현하지 않았다. 2002년 채집되어진 종자는 광조건에 관계없이 항온에서 거의 발아하지 않았으나 광조건하의 변온에서는 발아율이 70%, 암조건하의 변온에서는 25%의 발아율이 보였다. 미국자리공의 발아는 광조건보다 지온변화에 보다 직접적으로 영향을 받는 것으로 판단된다.

• Korean journal of applied entomology
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• v.33 no.2
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• pp.74-80
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• 1994

The german cockroach, Blattello germanica L, populations were successively selected with dlchlowos for 11 generations. The resulting selected shin was investigated the resistance development. the cross resistance and the esterase actim@. In the dichlowos-selected(Rd) strain, the values of LCs increased 858 times more compared to the susceptible (S) strain. In the dich!o~vos-selected (Rd) strains, the cross-res~stance to chlorpyrifos, propoxur, fenvalerate and pemethnn showed 3.35. 4.09. 283 and 2.00 times. Esterase.activity of the Rd strain showed 1.33 times higher than that of the S strain in the filter paper test. In comparison of zymogram paitems of the estemse isoryme by thin agarose gel electrophoresis against the german cockroach, the S strain was separated by 4 bands uf esterase 3, 5, 6 and 8 bands and the Rd strain was separated by 6 bands of esterase 1, 2, 4, 5, 7 and 8 bands, and the resistant mechanisms of the Rd strain were considered as the 4 bands of esterase-1.2.4 and 7 bands except the common 2 bands of esterase.6 and 8 bands.