• Korean Institute of Interior Design Journal
• /
• v.16 no.1 s.60
• /
• pp.126-134
• /
• 2007

This study researches the effectiveness of virtual experiences as an evaluation method in design. For the study, I researched the result on the spatial recognition before, abstracted visual objects and factors in recognition process and made up 43 inquiries for the evaluation through the experts group. Besides, set the analytical code between recognition factor and spatial constituents, made analysis the result from it. From April 1st to June 30th in 2004, the virtual model of educational place, college main building and city library was established as a subject of the research and studied the result. The methods that are used for the study are frequent analysis, T-test, reliability analysis, factor analysis etc. and SPSSWIN Package is used for the statistic analysis. There were two times of analysis on the evaluation to analyze the effect of virtual models on the web basis, one group evaluated the virtual building same as real and the other group evaluated the building site. Then analyzed the differences and correlation between the two. In result, college building, the first subject of study, and the second city library shows that made little differences between on the spot evaluation and virtual evaluation. Therefore, it is considered that the design evaluation with virtual model on the web basis has a vantage. But some problems founded that solved between preceding and present research through the feedback. It is as follows, 1. detection of problems that insufficience validity in the first survey. 2. found some not-validity inquiries. 3. detection of necessities that qualitative improvement and technical repletion in virtual environment.

• Journal of Technologic Dentistry
• /
• v.31 no.1
• /
• pp.75-97
• /
• 2009

Objectives: Practice of dental technology poses great potential risk since the manufacturing processes are complex and involve dangerous devices and the students are asked to handle various materials in the casting and processing process. Lacking an understanding of the overall practice process, the beginners of practice are exposed to greater danger due to their unsafe attitudes and poor practice attitudes. This study set out to investigate the students of dental technology for their attitudes toward safety and their practice of safe actions during practice and to provide basic data for safety education to prevent any possible safety incidents during practice. Methodology: The subjects include total 408 dental technology majors in their sophomore and junior year. Based on literature study and previous studies, a structured questionnaire was made, distributed to the subjects right after practice, and gathered on the spot. The questionnaire contained total 60 items, and data were collected from April 20 to May 25, 2006. Results: Collected data were analyzed in frequency and $X(C)^{\sim}$-test using the SPSS 12.0 version. The analysis results show that the students believed that they could prevent safety accidents by following safety rules and guidelines as far as safety attitudes were concerned. However, they did nothing more than paying attention to many practice processes even though they thought they were dangerous. Conclusion: Overall the subjects practiced proper safety actions during practice with significance differences in their behavioral characteristics according to grade, gender and age. The significant differences according to grade seem to derive from safety education before practice, and those according to gender and age have more to do with individual actions and common sense according to gender and age than education. Thus practice teachers need to develop safety education materials for each practice process and provide systematic safety education before practice so that the students can practice safety actions.

• Journal of Preventive Medicine and Public Health
• /
• v.24 no.3 s.35
• /
• pp.314-327
• /
• 1991

To evaluate the effects on health by exposure to mixed organic solvents, the author analyzed some labortory findings of blood (hemoglobin, hematocrit RBC, WBC, SGOT, SGPT) and urine (protein, blood, sugar) that were obtained from 722 workers (male:446, female:276) who worked in plywood, painting and shoes factories in Pusan area from January to December, 1990. The result were as follows ; 1. The mean values of each hematologic findings were all within normal limit but there were significant differences at hematocrit, RBC, WBC, SGOT in male and at WBC, SGPT in female at the comparison of the mean values and the distribution according to the normal criteria by type of work. 2. There were no differences in urinalysis(protein, blood, sugar) by type of work. 3. In stepwise multiple regression, analysis of hematologic findings on age, working duration and type of work, regression coefficients on age and type of work were relatively high in male and female sub1, respectively. As a result of this study, it is considered that the measurement of WBC with morphology is significant in hematologic findings and instead of spot urine and urinstix, 24 hours urine and quantitative analysis is required in urinalysis in screening test for healthy status of workers who deal with the organic solvents.

• The Korean Journal of Food And Nutrition
• /
• v.33 no.4
• /
• pp.406-418
• /
• 2020

This study aimed to investigate the dietary guidelines from the dietitians and parents' perceptions in kindergarten. The survey was carried out by 39 dietitians and 320 parents in kindergarten of Sejong city from April 18 to May 14, 2019. Approximately, 48.6% of dietitians responded that the amount of food provided was adjusted according to the age and weight of the infant. Both dietitians and parents responded the most to 'to build the right eating habits' as the reason for dietary guidance. As a guiding method for infants who sneaked unpleasant food, 62.9% of dietitians responded 'teach them about the wrong behavior on the spot', and 63.7% of parents stated 'talk about wrong behavior later'. The necessity of linking the dietary guidance between kindergarten and the family was recognized by dietitians and parents. The most important content for the linkage of the dietary guidance was 'correct eating manners and attitude'. The biggest problem in the dietitian's dietary guidance was the guidance on an unbalanced diet. Our results indicated differences in the dietary guidance contents of dietitians' and parents' perception of importance. Apparently, it is considered essential to link kindergarten with the family to provide correct and effective guidance for children.

• Journal of the Korean Society for Precision Engineering
• /
• v.18 no.9
• /
• pp.179-185
• /
• 2001

In this study, a visual sensor system for weld seam tracking the I-butt weld joints in GMA welding was constructed. The sensor system consists of a CCD camera, a diode laser with a cylindrical lens and a band-pass-filter to overcome the degrading of image due to spatters and arc light. In order to obtain the enhanced image, quantitative relationship between laser intensity and iris number was investigated. Throughout the repeated experiments, the shutter speed was set at 1-milisecond for minimizing the effect of spatters on the image, and therefore most of the spatter trace in the image have been found to be reduced. Region of interest was defined from the entire image and gray level of searched laser line was compared to that of weld line. The differences between these gray levels lead to spot the position of weld joint using central difference method. The results showed that, as long as weld line was within $^\pm$15$^\circ$from the longitudinal straight fine, the system constructed in this study could track the weld line successful1y. Since the processing time reduced to 0.05 sec, it is expected that the developed method could be adopted to high speed welding such as laser welding.

• Journal of Mechanical Science and Technology
• /
• v.19 no.10
• /
• pp.1856-1863
• /
• 2005

In this study, a visual sensor system for weld seam tracking the I-butt weld joints in GMA welding was constructed. The sensor system consists of a CCD camera, a diode laser with a cylindrical lens and a band-pass-filter to overcome the degrading of image due to spatters and arc light. In order to obtain the enhanced image, quantitative relationship between laser intensity and iris opening was investigated. Throughout the repeated experiments, the shutter speed was set at 1/1000 second for minimizing the effect of spatters on the image, and therefore the image without the spatter traces could be obtained. Region of interest was defined from the entire image and gray level of the searched laser stripe was compared to that of weld line. The differences between these gray levels lead to spot the position of weld joint using central difference method. The results showed that, as long as weld line is within $\pm15^{o}$ from the longitudinal straight line, the system constructed in this study could track the weld line successfully. Since the processing time is no longer than 0.05 sec, it is expected that the developed method could be adopted to high speed welding such as laser welding.

• International conference on construction engineering and project management
• /
• 2015.10a
• /
• pp.667-668
• /
• 2015

While the plant projects grow bigger and global attention to the plant is increasing, efficient space arrangement is not working in plant project because of the complex structure in installing the equipment unlike the construction project. In addition to this, presently, problem in installation process caused by the disagreement between floor plan and real spot is rising. Therefore the target of this research is to solve the problems and reaction differences, caused by changing the space arrangement in installing the equipment of plant construction. And this research suggests the equipment arrangement method for construction and related processes. To solve the problem, 3D cloud point data of space and equipment is collected by 3D laser scanning and the space matching is operated. In processing the space matching, data is simplified by applying the octree algorithm. This research simplifies the 3D configuration data acquired by 3D scanner equipment through the octree algorithm, and by comparing this data, identifies the space for target equipment, and finally suggests the algorithm that makes the auto space arrangement of equipment possible in construction site and also suggests the process to actualize this algorithm.

• Imaging Science in Dentistry
• /
• v.35 no.2
• /
• pp.87-90
• /
• 2005

Purpose : The purpose of this study was to investigate variability of doses with same exposure parameters and evaluate radiographic density according to the variability of doses. Materials and methods Twenty-eight MAX-GLS (Shinhung Co, Seoul, Korea), twenty-one D-60-5 (DongSeo Med, Seoul, Korea), and eleven REX-601 (Yoshida Dental MFG, Tokyo, Japan) dental x-ray machines were selected for this study Surface doses were measured under selected combinations of tube voltage, tube current, exposure time, and constant distance 42 cm from the focal spot to the surface of the Multi-O-meter (Unfors Instruments, Billdal, Sweden). Radiographic densities were measured on the films at maximum, minimum and mean surface doses of each brand of x-ray units. Results With MAX-GLS, the maximum surface doses were thirteen to fourteen times as much as the minimum surface doses. With D-60-S, the maximum surface doses were three to eight times as much as the minimum surface doses. With REX-601, the maximum surface doses were six to ten times as much as the minimum surface doses. The differences in radiographic densities among maximum, mean, and minimum doses were significant (p<0.01). Conclusion : The surface exposure doses of each x-ray machine at the same exposure parameters were different within the same manufacturer's machines.

• Korean Journal of Human Ecology
• /
• v.23 no.3
• /
• pp.421-441
• /
• 2014

This study investigates the influence of policy-related factors on the intention to keep working among mothers with children under 12 years old, especially focusing on the differences between the mothers with preschool children and elementary school children. The study also considers the individual, family, job characteristics of mothers with children, in order to draw the specific impact of policy factors. Data was collected through e-mails from 500 working mothers living in urban area, and 489 interview data were finally utilized in analyses. The results of analyses show that the level of awareness on work-family balancing policy significantly influences on the intention to keep working among mothers with preschool children. On the contrary, there is no statistically significant policy-related factors influencing on the intention to keep working among mothers with elementary school children. Both studies and social polices excessively focused on the mothers with preschool children in terms of work-family balancing issues. Working mothers with elementary school children have not been spot-lighted as beneficiaries from social policy, even though elementary school children also should be cared by others after school. Effective social services assisting work-family balance among mothers with preschool children should be more developed.

• Journal of Veterinary Clinics
• /
• v.30 no.4
• /
• pp.247-252
• /
• 2013

We compared wound healing with $CO_2$ laser incision and scalpel incision by measuring the extent of bleeding, the ease of incision, time, degrees of adhesion and histological observation in pig's stomach. Eight healthy pigs were used. Two symmetrical incisions were made in ventral aspect of the stomach between the greater curvature and lesser curvature were made with scalpel and 2 mm spot diameter $CO_2$ laser (8W, continuous wave) in eight pigs. And then each wound was closed with absorbable suture in a two-layer inverting seromuscular pattern. At 7 and 14 days after initial wounding, each wound was taken for histological observation. On surgery, the extent of bleeding, the ease of incision and incision time showed significant differences between the two groups. The $CO_2$ laser provided better hemostasis (p < 0.01) and smaller postoperative adhesion compared with the scalpel. However, the scalpel produced faster speed of incision and was easier to handle than the $CO_2$ laser group (p < 0.01). There was no considerable difference between the two groups in histological observation.