• Korean Journal of Optics and Photonics
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• v.14 no.1
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• pp.1-7
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• 2003

We determined the optical constants of organic light emitting material of Alq$_3$ in a spectral range between 1.5 and 6 eV using the physical model introduced by Forouhi and Bloomer［Phys. Rev. B 34, pp. 7018-7026, 1986.］. The initial parameters of $A_i,\;B_i,\;C_i$ of Forouhi-Bloomer dispersion relations were determined from the absorption peaks and widths of absorption spectra of the Alq$_3$ film. The refractive index of substrate, a fused silica, is derived from the Sellmeier equation with the measured transmittance and reflectance spectra. Then, the complex refractive index and thickness of the Alq$_3$ film were calculated by use of a nonlinear least square fitting program with the Forouhi-Bloomer dispersion relation and the measured transmittance and reflectance spectra.

• Journal of Korean society of Dental Hygiene
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• v.12 no.3
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• pp.503-511
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• 2012

Objectives : This research seeks to present the data needed for the development of coping strategy, following medical market opening by identifying dental hygienists' perspective and coping measures towards the opening. Methods : One hundred eighty-eight dental hygienists were targeted to identify their level of perception towards medical market opening, attitude towards medical market opening, question of whether they agree or not with the opening and reasons, and coping measures and benefits of the medical market opening. t-test, chi-square test and cross-tabulation analysis were used for the analysis Results : First, team leaders are more aware of the medical market opening and hold greater sense of crisis towards opening compared to the rank and file. Second, the reasons cited for agreeing with the medical market opening included improvement of medical services' quality and diversification of services. As for the reasons for disagreeing, they cited the increase medical expenses paid by public. Third, limitation of the hospital management technique was cited the most when it comes to the scope of Korean hospitals' management crisis, followed by the limitations of the diagnosis procedure, limitations of the medical services, limitations of the medical techniques and increase in the number of large hospitals, in the order cited. Fourth, team leaders perceive greater need to seek coping measures from the aspect of realizing medical insurance fee from the policy development, service and system level aspects when it comes to the coping measures depending on their ranks. Conclusions : Therefore, Dental Hygienist has a comparatively low awareness of medical market opening, coping measures need to be explored to cope with the medical market opening by ensuring the dissemination of accurate knowledge through the education on the fees for dental hygienist and seminars in relation to the medical market opening.

• The Journal of the Korean dental association
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• v.53 no.9
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• pp.628-643
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• 2015

Purpose: The aim of this retrospective study was to compare marginal bone loss and survival rates of double short implants(multiple implant) which had been installed and restored in severely atrophic maxillary molar site without a grafting procedure. Material and Method: The subjects were patients (90 patients, 180 implants) who had been installed double short implants in severely atrophic maxillary single molar site without bone augmentation procedure from 2006 to 2014 in dental clinic in Chuncheon city. Following data were collected from dental records and radiographic panoramic views: patient's age, gender, smoking status, implant site, timing of implant installation, residual ridge height. The correlation between those factors and survival rate and marginal bone loss were analyzed. Statistical analysis was performed using Chi-square test, Student's t- test and ANOVA. Result: Eleven implants in 6 patients failed and the cumulative survival rate was 93.9%. No significant differences were found in relation to the following factors: patient's age, gender, implant site, timing of implant installation (P> .05). There were significant differences in smoking status and residual ridge height(P< .05). The average follow-up time was $45{\pm}14.7months$. The mean marginal bone loss of survived 169 implants was $0.08{\pm}0.59mm$. Conclusion: Despite the short term outcomes, the survival rate of double short implants was comparable to normal length implants. This study demonstrated that placement of double short implants without the use of bone grafting procedure for severely atrophic posterior maxilla is a simple and predictable treatment procedure.

• Journal of the Korean Home Economics Association
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• v.31 no.2
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• pp.177-188
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• 1993

To obtain a clear understanding of the degree of effect by the food color in diet habits, this study was a survey of the taste for food color. In this study, the term of investigation was tow months(May and Jun. 1992), the object was 10's∼50's women, and the sampling of them at random contain 100 person, respectively. The data-treatment was determinded by frequency, percentage, SD, Chi-square, Spearman's rank order correlation coefficient, Correlation, F-test as measured by SAS program for PC and statistical figures were obtained by GDAS. The results were as follows; 1. Food color in diet habits. : The relationship of food color with appetite by age group was showed to affect all age groups having more then 90%. The concern for food color by age group showed the lowst teenage having 56.7%, showing more then 70% except teenage. When chosen food, The most important characteristics of food was not age group but taste. In the correlation between characteristics, The correlation between color and form, taste and nutrition was showed affirmative. The difference test for the taste of food color and general color was shown, and the level of significance was chosen at 95%. 2. In the correlation between food color and the sense of emotion, The food color of depression and solitude was purple, the color of sadness and crying was white. But in case of only solitude, A statistical significance was shown. 3. In the investigation of taste for food color, the mean of taste degree was high in red, orange, yellow, yellowish green, green, white and low in blue, black. Their statistical significance was shown between colors but, was not shown between age groups. 4. In the relation of food color and associated with food, the colors of associated with food shown a vast difference with natural food color were blue(85.5%), purple(80.0%), pink(41.7%) and yellow(40.0%) but, A red color was not shown the error rate of associated with food color at all. Almost all kinds of associated with food were fruits and vegetables.

• Asian Pacific Journal of Cancer Prevention
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• v.13 no.7
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• pp.3149-3152
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• 2012

Objective: The prognostic significance of perineural invasion (PNI) in gastric cancer has been previously investigated but not clearly clarified. The objective of our study was to investigate the role of PNI as prognostic factor in patients undergoing curative surgical resection and without distant metastasis in comparison with other clinicopathological factors. Methods: Between 2001 and 2010, 287 cases of gastric adenocarcinoma underwent radical gastrectomy recorded in hospital based registries. PNI was assessed as positive when cancer cells were seen in the perinerium or neural fascicles intramurally. Categorical and continuous variables were summarized using descriptive statistics and compared using chi-square and Mann-Whitney U tests, respectively. Cancer related survival rates were estimated by the Kaplan-Meier method. Results: PNI was positive in 211 of 287 cancers (73%), with a positive relation to lymph node metastases and advanced stage (p=0.0001, p=0.0001, respectively), mural invasion, and lymphatic and blood vessel invasion (p=0.0001, p=0.0001, respectively). The median survival of the PNI positive patients was significantly shorter than that of their PNI negative counterparts (24.1 versus 38.2 months, p=0.008). In the multivariate analysis, we detected PNI was an independent prognostic factor (p=0.025, HR=1.21, 95% CL 1.08-2.3) along with classical clinicopathological variables such as lymph node involvement (p=0.001), pT stage (p=0.03), and LVI (p=0.017), but not age, gender, tumour localization, stage, histologic type, and surgery procedure. Conclusions: PNI positivity in gastric cancers was related mural invasion, lymph node involvement, advanced stage and lymphatic and venous blood vessels. The presence of PNI appeared as an independent prognostic factor on survival on multivariate analysis, not influenced by tumor stage, lymph node metastases and other classical factors.

• Journal of the Korean Society of Costume
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• v.51 no.8
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• pp.93-110
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• 2001

The present study attempted to compare the behavioral patterns and attitudes of American and Korean female students toward apparel ads in magazines in relation to their physical self-concept. The study used a self-administered questionnaire. The sample consisted of 730 female students majoring in the fields related to clothing and textiles : 310 American students at six colleges and universities located in the west, northeast and southwest parts of the U.S., and 412 Korean students at four Seoul-based universities. Likert scales were used for most measures with 1=never or very unimportant and 5 =always or very important. Physical self-concept was measured on the basis of W. S. Jung's Standardized Self-concept Test and Tennessee Self-concept Scale. Surreys were back translated for validity. Percentage, t-test, Contingency Tables and Chi-square were used for the analysis of the data. Results are as follows : (1) Korean students read more magazines than U.S. students, however, Vogue was the most popular for both groups. (2) Those with a high sense of Physical self-concept read more magazines. for both countries. (3) American students'attitudes toward apparel ads in magazines were similar, regardless of whether their sense of physical self-concept was high or low. For Koreans, those with higher sense of physical self-concept showed greater interest in magazine ads, consulted magazines for fashion trends, found ads more useful, and more often expressed satisfaction with the ads, than the lower self-concept group. (4) Korean students cited a lack of information in ads while American students felt body types of models were unrealistic. Both Koreans and Americans in the higher self-concept group expressed a greater level of dissatisfaction with apparel ads in magazines. (5) Advertisers should attempt to again a deeper understanding of the socio-psychological characteristics of their readership as self-concept appears to be related to several magazine readership attitudes and behaviors. Magazines targeting Americans might consider the importance of coordination and merchandising. Apparel ads targeting Korean should consider the importance of company ads.

• Journal of Korean Clinical Health Science
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• v.6 no.1
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• pp.1056-1064
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• 2018

Purpose. This study reported on body type perception of people aged ${\geq}19years$, regardless of gender, and on its association with disease morbidity and the quality of life and aimed to observe the effects of stress on body weight perception, disease morbidity, and the quality of life. Methods. The data from 218,899 persons aged ${\geq}19years$ who were respondents to the 2010 Community Health Survey were finally analyzed. A designated program was used to perform complex sample analysis; chi-square test was carried out to determine body type perception by the general characteristics and disease status and analyze health-related behavior and weight control behavior by body type perception, and multiple logistic regression was used to observe the effects of body type perception on mental health and the quality of life. Results. 34.9% of all the respondents misperceived their body type and females were more likely to misperceive their body type. The older they were, the more poorly they perceived their body type; those perceiving their body type poorly were significantly more susceptible to both hypertension and diabetes. When correction was made in relation to gender, age, and so on, those perceiving their body type excessively were more susceptible to hypertension (1.43[1.367-1.050]) and diabetes morbidity (1.36[1.294-1.428]). Body type perception affected the quality of life: the respondents perceiving their body type poorly (0.91[0.884-0.940]) or excessively (0.75[0.720-0.770]) showed lower quality of life than those perceiving their body type correctly. Conclusions. Distorted body type perception affected disease morbidity and the quality of life: the respondents excessively perceiving their body type were significantly more susceptible to both hypertension and diabetes and those perceiving their body type excessively or poorly showed lower quality of life than those perceiving it correctly. It is therefore necessary to make multilateral efforts to cultivate correct body type perception.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.10
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• pp.7204-7210
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• 2015

This paper has developed the system for supporting the approximate construction cost and the quantity estimation based on 3D model information in the pre-project planning phase of 3-span continuous cable-bridge with 2-pylons. First of all, we'd analyzed the design information (structural design report, blueprint and quantity) of the existing cable-stayed bridges and derived the design variables of cable-stayed bridges. We developed the BIM wizard that generates a cable-stayed bridge model parametrically based on derived design variables. The principle material quantities of cable-stayed bridge are calculated directly from 3-dimensional bridge model built by using the BIM wizard. Then, we can estimate the construction cost in relation to its quantities and unit cost of cable-stayed bridge. In a result, we have established the system that the construction cost can be estimated more specific than the conventional method (construction estimates per meter or square meter). We hereby will be able to review various alternatives as soon as possible in bidding process.

• Composites Research
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• v.12 no.1
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• pp.68-75
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• 1999

This study has observed that the dynamic behavior of Metal Matrix Composites (MMCs) in low velocity impact varies with impact velocity. MMCs with 15 fiber volume percent were fabricated by using the squeeze casting method. The AC8A was used as the matrix, and the alumina and the carbon were used as reinforcements. The tensile and vibration tests conducted yielded the yielded the tensile stress and elastic modulus of MMCs The low pass filter and instrumented impact test machine was adopted to study dynamic behaviors of MMCs corresponding to impact velocity. Stable impact signals were obtained by using the low pass filter. Impact corresponding to impact velocity. Stable impact signals were obtained by using the low pass filter. Impact energy of unreinforced alloy and MM s increased as the impact velocity increased. The increase of crack propagation energy was especially prominent, but the dynamic toughness of each material did not change much. To show the relation between crack initiation energy and dynamic fracture toughness, a simple model was proposed by using the strain energy and stress distribution at notch. The model revealed that crack initiation energy is proportional to the square of dynamic fracture toughness and inversely proportional to elastic modulus.

• Journal of Korean society of Dental Hygiene
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• v.11 no.5
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• pp.649-657
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• 2011

Objectives : The purpose of this study was to research attitude and satisfaction of the students in the department of dental hygiene in Jeolla-do and Chungcheong-do. Methods : We surveyed 499 students at the department of dental hygiene at colleges. During the period from October 2 to October 30, 2009 using a self-administered questionnaires. The data were analyzed with chi-square, t-test and one-way ANOVA, person correlation coefficients and multiple regression using the SPSS 13.0 program. Results : As for entrance motive with Dental Hygiene, 63.9% of the employment and selection information was 36.3% by oneself. As for pre-knowledge before entrance about dental hygiene by grade(p<0.01), as for satisfaction in the department dental hygiene by regional groups(p<0.05), as for aptitude suitability by educational system(p<0.05), as for encourage of enter school by grade and regional groups(p<0.05), by educational system(p<0.01) were statistically significant. As for encourage of enter school, aptitude suitability, pre-knowledge before entrance about dental hygiene were positive relation to satisfaction in the department dental hygiene. Multiple regression analysis indicated with explanatory power of 30.8% about satisfaction in the department dental hygiene. Conclusions : This study reports that it is necessary to carry out further studies on the various educational process and development of program in college. Dental hygiene education for the whole man and for promote efficiency in the department of dental hygiene, should be positive information activity via various media get the correct information of a department choice.