• 대한치과기공학회지
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• 제39권3호
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• pp.197-204
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• 2017

Purpose: This study aims to discover the degree of department of dental technology students' oral health recognition and to find out the differences of oral health beliefs depending on oral health behaviors. Method: The subjects in this study were the students who attended department of dental technology in Daejon, Daegu, Iksan. After a survey was conducted, the collected data were analyzed with SPSS 23.0. An analysis of frequency, independent t-test, one-way ANOVA, correlation was used. Result: Among the general things related to oral health behaviors was the statistical significant differences(p<0.05) in the area of oral health belief depending on the opportunity of oral health education, attendance of oral health course, self-aware of oral health, the number of times of teeth brushing, teeth brushing status, experience and the degree of smoking. There was a positive correlation between the degree of susceptibility and that of response to severity, barrier, salience and benefit. Severity also showed the positive correlation with barrier. Higher barrier susceptibility meant higher salience and higher benefit. So was the correlation between benefit and salience. Conclusion: This study showed that college education should focus on the students' possible behaviors in order to convey the effective oral health knowledge.

• 한국의상디자인학회지
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• 제17권4호
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• pp.67-76
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• 2015

The purpose of this study is to set a direction for the development of men's underwear after analyzing current applications for patent regarding men's special-purpose underwear. In terms of a research method, the disclosed patents and utility models were investigated using the patent information database provided by Korea Institute of Patent Information (KIPRIS, http://www.kipris.or.kr). For this, the patents applied from 1990 to October 2015 were targeted. The keywords used for patent search were 'men's underwear' and 'men's special-purpose underwear.' When searched by the keywords above, a total of 1,089 cases were found. Except for expired or cancelled ones, 243 cases were investigated. Then, annual application trends, current registrations on literature records, classification of utility model right holders and contents by topic were analyzed. In terms of data analysis, frequency analysis, crosstabulation analysis and multiple response analysis were conducted, using SPSS 18.0. The results found the followings: In terms of annual application trends, the number of applications for patent started to gradually increase since 2007. Since 2011, it has rapidly increased. In terms of the number of patent registrations, literature registration was far higher than utility model registration. In terms of application rights, 'individually registered (58.8%)' was higher than 'registered by the organization (41.2%).' Among 243 cases, 'underwear (58%)' was the highest, followed by 'men's underwear-related items (29.2%)' and 'thermals (8.2%).' According to analysis on the details of the patent applied for men's underwear, 'penis-scrotum separation' was most focused, followed by 'disposable product' 'airy features,' 'scrotum protection' and 'structure of underwear.'

• 한국철도학회논문집
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• 제16권4호
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• pp.286-297
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• 2013

본 연구에서는 PSC-I 거더 교량을 대상으로, 3차원 교량 모델로 이동하중해석에 의한 엄밀한 동적 안정성 해석을 수행할 때의 모델링 방법과 해석방법에 대한 영향 평가를 수행하였다. 이를 위해 콘크리트 및 자갈궤도 등을 채용할 때의 합리적인 모델링 방법론과 물성치를 제시하였다. 또한, 궤도 모델링 유무, 궤도 종류, 거더 중심에서 받침까지의 거리 고려 여부, 직접적분법과 모달해석법 등 이동하중해석법, 필터링 등이 응답에 미치는 영향을 분석하였다.

• Smart Structures and Systems
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• 제4권6호
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• pp.727-740
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• 2008

A down hole vertical seismic array is a sequence of instruments installed at various depths in the earth to record the ground motion at multiple points during an earthquake. Numerous studies demonstrate the unique utility of vertical seismic arrays for studying in situ site response and soil behavior. Examples are given of analyses made at two sites to show the value of data from vertical seismic arrays. The sites examined are the Lotung, Taiwan SMART1 array and a new site installed at Jingliao, Taiwan. Details of the installation of the Jingliao array are given. ARX models are theoretically the correct process models for vertical wave propagation in the layered earth, and are used to linearly map deeper sensor input signals to shallower sensor output signals. An example of Event 16 at the Lotung array is given. This same data, when examined in detail with a Bayesian inference model, can also be explained by nonlinear filters yielding commonly accepted soil degradation curves. Results from applying an ARMAX model to data from the Jingliao vertical seismic array are presented. Estimates of inter-transducer soil increment resonant frequency, shear modulus, and damping ratio are presented. The shear modulus varied from 50 to 150 MPa, and damping ratio between 8% and 15%. A new hardware monitoring system - TerraScope - is an affordable 4-D down-hole seismic monitoring system based on independent, microprocessor-controlled sensor Pods. The Pods are nominally 50 mm in diameter, and about 120 mm long. An internal 16-bit micro-controller oversees all aspects of instrumentation, eight programmable gain amplifiers, and local signal storage.

• 한국해양공학회지
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• 제27권5호
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• pp.63-69
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• 2013

The mooring lines of a floating type offshore plant are known to show wide banded and bimodal responses. These phenomena come from a combination of low and high frequency random load components, which are derived from the drift-restoring motion characteristic and wind- sea, respectively. In this study, fatigue models were applied to predict the fatigue damage of mooring lines under those loads, and the result were compared. For this purpose, seven different fatigue damage prediction models were reviewed, including mathematical formula. A FPSO (floating, production, storage, and offloading) with a $4{\times}4$ spread catenary mooring system was selected as a numerical model, which was already installed at an offshore area of West Africa. Four load cases with different combinations of wave and wind spectra were considered, and the fatigue damage to each mooring line was estimated. The rain flow fatigue damage for the time process of the mooring tension response was compared with the results estimated by all the fatigue damage prediction models. The results showed that both Benasciutti-Tovo and JB models could most accurately predict wide banded bimodal fatigue damage to a mooring system.

• 대한조선학회논문집
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• 제30권3호
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• pp.75-89
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• 1993

본 논문은 기본적으로 미국 기계학회의 성능시험 코드에 준하여 운동 모형시험에 불확실성 해석을 적용하였다. 총 불확실성은 시험준비 과정, 계기의 검증, 데이타 취득 과정 및 분석과정에서 발생하는 오차요인들과 오차 전파 방정식에 의해 구하여진 민감도와 결합하여 구해진다. 저항추진 시험과 같은 정적시험과 운동시험과 같은 동적시험의 차이들이 불확실성 해석의 모든 과정동안 분명하게 구별되며 또한 비대칭 고정오차항목이 고려되었다. 본 불확실성 해석이 수행된 운동 응답 항목은 무차원화된 주파수의 함수로 나타낸 상하동요와 종동요의 RAO이다. 운동시험에 대한 불확실성 해석은 측정 정도를 향상시키고 오차들을 정량화하는데 유용할 뿐만아니라 여러가지 운동 해석 프로그램에 대한 검증의 기준으로 제시될 수 있다.

• Earthquakes and Structures
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• 제17권2호
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• pp.175-189
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• 2019

The aim of the study is to show the results of complex shaking table experimental investigation focused on the response of two models of cylindrical steel tanks under mining tremors and moderate earthquakes, including the aspects of diagnosis of structural damage. Firstly, the impact and the sweep-sine tests have been carried out, so as to determine the dynamic properties of models filled with different levels of liquid. Then, the models have been subjected to seismic and paraseismic excitations. Finally, one fully filled structure has been tested after introducing two different types of damages, so as to verify the method of damage diagnosis. The results of the impact and the sweep-sine tests show that filling the models with liquid leads to substantial reduction in natural frequencies, due to gradually increasing overall mass. Moreover, the results of sweep-sine tests clearly indicate that the increase in the liquid level results in significant increase in the damping structural ratio, which is the effect of damping properties of liquid due to its sloshing. The results of seismic and paraseismic tests indicate that filling the tank with liquid leads initially to considerable reduction in values of acceleration (damping effect of liquid sloshing); however, beyond a certain level of water filling, this regularity is inverted and acceleration values increase (effect of increasing total mass of the structure). Moreover, comparison of the responses under mining tremors and moderate earthquakes indicate that the power amplification factor of the mining tremors may be larger than the seismic power amplification factor. Finally, the results of damage diagnosis of fully filled steel tank model indicate that the forms of the Fourier spectra, together with the frequency and power spectral density values, can be directly related to the specific type of structural damage. They show a decrease in the natural frequencies for the model with unscrewed support bolts (global type of damage), while cutting the welds (local type of damage) has resulted in significant increase in values of the power spectral density for higher vibration modes.

• Fisheries and Aquatic Sciences
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• 제24권2호
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• pp.78-88
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• 2021

The annual consumption of fishery products, particularly sea squirt (Halocynthia roretzi), per person has steadily increased in South Korea. However, the quantitative risk of Vibrio parahaemolyticus following intake of sea squirt has not been analyzed. This study focuses on quantitative predictions of the probability of consuming sea squirt and getting of V. parahaemolyticus foodborne illness. The prevalence of V. parahaemolyticus in sea squirt was evaluated, and the time spent by sea squirt in transportation vehicles, market displays, and home refrigerators, in addition to the temperature of each of these, were recorded. The data were fitted to the @RISK program to obtain a probability distribution. Predictive models were developed to determine the fate of V. parahaemolyticus under distribution conditions. A simulation model was prepared based on experimental data, and a dose-response model for V. parahaemolyticus was prepared using data from literature to estimate infection risk. V. parahaemolyticus contamination was detected in 6 of 35 (17.1%) sea squirt samples. The daily consumption quantity of sea squirt was 62.14 g per person, and the consumption frequency was 0.28%. The average probability of V. parahaemolyticus foodborne illness following sea squirt consumption per person per day was 4.03 × 10^-9. The objective of this study was to evaluate the risk of foodborne illness caused by Vibrio parahaemolyticus following sea squirt consumption in South Korea.

• 대한수의학회지
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• 제41권2호
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• pp.203-210
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• 2001

방사선 피폭선량의 예측을 위한 방사선 민감 지표 모델 개발을 위하여 코발트-60 감마선과 의료용 싸이크로트론 50 MeV($p{\to}RBe^+$) fast neutron을 0.25 Gy에서 1 Gy의 선량을 랫드에 각각 전신 조사한 후 말초혈액내 임파구와 소장에 음와세포의 형태학적 변화를 apoptotic fragment assay법을 이용하여 관찰하였다. 모든 방사선조사군에서 음와세포와 말초 임파구에 아포토시스의 유도가 증가된 것이 관찰되었으며, 이것은 방사선이 방사선 민감세포의 아포토시스 유도를 자극한 것으로 보인다. 상기의 결과는 아포토시스가 손상된 세포를 제거하므로 손상된 방사선 민감 표적 장기의 항상성 유지에 중요한 역할을 하는 것으로 판단되었다. Apoptotic fragments의 발생빈도에 대한 선량-반응곡선에 있어서 음와세포는 중선자 조사군이 $y=0.3+(6.512{\pm}0.279)D(r^2=0.975)$으로, 반면에 감마선 조사군은 $y=0.3+(4.435{\pm}0.473)D+(-1.300{\pm}0.551)D^2(r^2=0.988)$의 식을 얻었다. 그리고 말초 임파구에서는 감마조사군이 $y=3.5+(118.410{\pm}10.325)D+(-33.548{\pm}12.023)D^2(r^2=0.992)$의 식으로 나타났다. 이와 같이 감마선조사군은 공히 linear quadratic model 이였으나 중성자조사군은 linear model 로 관찰되었다. 조사된 세포의 종류와 상관없이 apoptotic fragments의 발생빈도와 조사 선량간의 유의한 효과가 있는 것으로 확인되었다. 이상의 결과에서 조사선량의 증가와 비례하여 방사선 민감 세포의 apoptotic fragments가 수적으로 증가하였으며, 고준위 방사선이 저준위 방사선보다 선량 반응 곡선과 시간 경과에 따른 영향이 보다 강한 것으로 인지되었으며, 음와세포의 apoptosis 유도에 대한 중성자선의 방사선 생물학적 효과비(RBE)는 1.919 였다. 그리고 모든 방사선조사군에서 방사선피폭 후 4시간과 6시간에 apoptosis 유도가 가장 많았으며, 음와세포의 형태학적 소견은 정상 대조군에서 관찰되지 않는 전형적인 apoptotic fragments가 나타났다. 따라서 음와 세포와 말초 임파구에서의 아포토시스 유도는 방사선 조사에 의한 세포 손상의 생물학적 영향 평가를 위한 검색 및 방사선 피폭선량 예측의 지표로 이용 가능할 것으로 사료됨.

• 유통과학연구
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• 제11권2호
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• pp.71-81
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• 2013

Purpose - The TOEIC test has been leading the change in the quality and the globalization of companies for about last 30 years. The TOEIC test is taken by about two million people each year and is used as a criterion to select new employees in companies or government offices, for performance ratings, and for overseas posting selections. Universities also use TOEIC test in various ways. Since the TOEIC test is used for the selection of new students for admission, transferring extra credits, scholarships, graduation certification, and admission of international students studying abroad, many universities all over the country provide students with TOEIC study lectures through their own language institutes. Despite the fact, there has been no research on the service quality or even the current situation of these institutes. Thus, this study aims to evaluate the factors that impact TOEIC lecture service quality and analyzes the effect of the expectation related to the education service quality and the result of education on intentional behavior. Research design, data, methodology - Data was collected by administering a survey to current TOEIC students from different university language institutes. The survey questionnaire comprised of a five-point Likert scale. The demographic analysis was conducted using the frequency analysis method and the factor analysis was conducted to verify the validity of questionnaire over any variable. The reliability analysis was conducted to verify the reliability of the results. Besides, multiple regression analysis, regression analysis, and mediated effect verification were also conducted. For education service quality, four different independent variables such as reliability, response, conviction, and sympathy were considered using the SERVQUAL survey model. Based on the research models, the study hypotheses below were formulated in order to recognize an effect relationship between the variables. The four hypotheses are, "the hypothesis on education service quality and TOEIC study result expectation," "the hypothesis on education service quality and behavioral intention," "the hypothesis on study result expectation and behavioral intention," and "the hypothesis on study result expectation and mediated effect." Results - The results are as follows. First, the factors like response, conviction, and sympathy have a positive influence on TOEIC study result expectations. Second, the TOEIC study result expectation has a positive influence on the factors of behavioral intention such as re-sign up, positive word-of-mouth, "loyalty towards school." Third, it was verified that the mediated effect on behavioral intention was influenced by education service quality at university foreign language institute, while the study result expectation has only a partial mediated effect. Conclusions - The implications of this study are summarized as follows: First, it suggests a new research model for the effect of the expectation related to the education service quality and the result of education in the university language institutes on the behavioral intention. Second, it has established a relationship between the education service quality and study result expectation by verifying the mediated effect on them.