• Journal of Technologic Dentistry
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• v.33 no.4
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• pp.427-440
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• 2011

Purpose: The following research analyzes the causes of major selection and career decision of students studying dental technology. It is to be used as basic data for the management of career improvement program. Methods: The survey has been processed to 490 college students studying Dental Technology in D-college. Questionnaire consists of major selection confidence sheet (14 items) and career decision confidence sheet (18 items) and was scored with 5-points per question. The collected data was analyzed by the statistical program: SAS V8 for Windows. To test for significance on each item, p < 0.05 has been decided as a standard. Results: The analysis of result about the level of confidence on major selection has valid difference by genders, serving military service or not, experience of studying one more year to enter the college or not, making career decision and grade. The analysis of result about career decision has valid difference by gender, serving military service, career decision, day and night course, age and native place. Conclusion: We develop the career advice program and manage it effectively, the confidence on the major selection and pride about its faculty will be high to dental technology students.

• Journal of Technologic Dentistry
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• v.29 no.2
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• pp.65-77
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• 2007

This study is for the purpose of studying the validity of the construction of items and grading of the evaluation table at clinical practice used as the method of evaluation when clinical practice of Dept. of Dental Technology. 205 dental technicians in 4 cities were questioned to analyze the relation between items of the evaluation table at clinical practice and its grading. The collected materials were inspected by SAS V8 for Windows. The results are as follows: 1. Making up all the items and grading seem to be appropriate because they had the marks more than midium(more than 3.28). 2. Making up detailed items and grading seem to be trusted because they had the marks more than 3.30. 3.The significance level of the relation between items of the evaluation at clinical practice and its grading by t-inspection is p<0.0001 and so it appears to be meaningful. 4. It proved to be meaningful in result of regression analysis of the influence on the construction of the evaluation at clinical practice and its grading. With this result, further study is needed for the better methods of the evaluation in its adjustment and graduated grading among the items.

• Magazine of the Korean Society of Agricultural Engineers
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• v.34 no.1
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• pp.10-19
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• 1992

서해안 시대를 맞이하여 21세기를 열어나갈 새萬金 千拓綜合開發事業 기공식이 지난해 11월 28일 전북 부안군 변산면 대항리 현장에서 盧泰愚대통령, 曺京植농림수산부장관, 金榮鎭農漁村振興公私社長, 국회농림수산위원회 위원장, 전북도지사, 地域出身國會議員등 내외 귀빈과 지역 주민 2,400여명이 참석한 가운데 열려 사상 최대의 간척사업으로서 첫발을 내딛었다. 이날 盧泰愚대통령은 치사를 통해 "자손만대에 물려줄 웅대한 국토확장의 첫삽을 뜨게 되어 깊은 감회를 느낀다"면서 "만경, 김제의 넓은 벌이 우리나라의 곡창으로 겨레의 삶을 보장해온 터전이었듯이 새만금의 광활한 간척지를 21세기 번영을 기약하는 땅이 되도록 하자"고 당부하였다. 새만금사업의 공사기간은 '91년부터 98년까지 외곽방조제를 완공하고 2004년까지 내부개발을 완료할 예정이고, 총 사업비 1조 3천억원을 투입하게된다. 사업지역은 1도 3군 1시 19읍면동 (전북 옥구군, 부안군, 김제군, 군산시)에 걸쳐서 40,100ha를 개발하게 된다. 주요시설로는 부안군 변산면 대항리에서 可力島, 新侍島, 夜味島, 및 飛鷹島를 연결하는 세계 최장의 방조제 33km를 축조하고 방조제 위에는 4차선 도로를 설치하고 장항선이 군산하구둑을 경유, 이 방조제를 거쳐 고군산군도까지 갈 수 있도록 하는 철도부지도 건설된다. 이와 함께 새만금국제항을 개설, 연간 5,000만톤의 하역능력을 갖게 되고 고군산군도를 잇는 관광휴양지가 형성된다.

• Journal of Technologic Dentistry
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• v.19 no.1
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• pp.43-54
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• 1997

This investigation is carried out of inqurie into the effects of the accelerator on the setting time and haedness when it is used with plaster products. Plaster($\beta$), dental hard stone($\alpha$), and limproved dental hard stone($M{\alpha}$) are selected as the objects of the investigation, since they are most common materials for dental plaster products. Setting time is gauged by means of Vicket Needle and Gilmore Needle, and hardness is gauged by means of Brinell and Vicket Hardness machines. Samples of each material are made in the standerd water powder ratio and with the accelerator repectively, Every material is tested five times each. The results of the tests are as fallow : 1) In each case the setting time is shortened when the accelerator is used. 2) Of the three materials the hardness of the plaster was lowest A($\beta$) < B($\alpha$) < C($M{\alpha}$)} 3) In each case the hardness of the samples made in the standard water powder ratio were higher than that of the sample made with the accelerator. A1 > A2 ; B1>B2 ; C1>C2 4) Final Conclusion : Higher quality cast is expected when it is made in the standard water powder ratio.

• Journal of Technologic Dentistry
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• v.16 no.1
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• pp.43-56
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• 1994

The object of this study is, after the dental technology department is developed into the three-year curriculum and so new curriculum is needed, to compare, analyze, and appreciate the two-year model curriculum that has been practiced in our country, to analyze the curriculum and national quality system practiced in the developed country like U. S. canada, Germany and Japan, and, on the basis of the result from the upper part and inquiry result in the dental technology faculty commity of the nationwide junior college, to establish the new curriculum that is suitable the condition of our dental technology department in the junior college. 1) Since the width of the education is broader after the dental technology department is developed into three-year curriculum from the two-year curriculum, the course of study connected with the dental technology is added. 2) The fundamental course is propounded and the practical course which is needed on the spot is assigned. 3) Since the importance of the practical education is understood time and unit of the experimental practice is extended. 4) The time control in the curriculum commected with the national examination is adjected. 5) On the basis of the actual experience, the actual course is propound and time and unit are added widely to uplift the adjustment of the current environment of the dental technology.

• Journal of Technologic Dentistry
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• v.43 no.1
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• pp.13-18
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• 2021

Purpose: This study aimed to compare the flexural properties and perform the Weibull analysis of photo-curing three-dimensional (3D) printing resin. Methods: Photo-curing temporary resin (3D polymer) was used as a printing resin. Specimens (65 × 10 × 3.3 ㎣) were prepared following the ISO 20975-1 guidelines and according to the different printing orientations using a digital light processing 3D printer (D2 120; Dentium). The flexural strength (FS), flexural modulus, and work of fracture (WOF) were measured using a universal testing machine (Instron 3344; Instron) at a crosshead speed of 5 mm/min. Results: In this study, the 0° orientation exhibited higher FS and WOF than the 45° orientation. Significant differences were found among the printing orientations (p<0.05). Specimens printed at the 0° orientation were the most accurate. In the Weibull analysis, 0° showed the greatest Weibull modulus (m), which represents a higher reliability. Conclusion: 3D printing should be selected and used by considering flexural properties, size accuracy, and reliability.

• Journal of Technologic Dentistry
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• v.43 no.4
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• pp.139-144
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• 2021

Purpose: This study aimed to provide basic data to identify the current status of use of maxillofacial prosthesis across the world and discuss its application and research directions in Korea. Methods: Existing literature (study period, 2010 to 2020) from international studies was collected from PsycINFO, CINAHL, and PubMed, whereas domestic studies were searched using KISS and RISS. Maxillofacial prosthesis was used as the search word. A total of three foreign and two domestic articles were searched, and as a result, a total of 12 documents were selected for analysis. Results: A total of 3,311 studies were searched in this study. Among them, 3,253 articles contained in duplicate inspection and exclusion criteria were removed, and 12 articles were selected by removing literature that did not meet the research criteria through title and green and text reviews. Finally, two researchers selected the final 12 articles through handwritten searches. Eleven of them were case studies, and the remaining one was a descriptive study. Conclusion: This study identified the current status of studies that implemented maxillofacial prosthesis, published from January 2010 to January 2020. Facial prosthetics improve the quality of life of patients by restoring defects that appear on different types of mouth and face and promote both function and aesthetics. Therefore, they can be used to treat various conditions and have a positive impact on the future.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.7
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• pp.4449-4456
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• 2014

This study analyzed the dental technician's social support and individual competency as well as its correlation. 200 dental technicians in Seoul, Incheon, and Chunchungnamdo area were selected. The survey was carried out from April 28, 2012 to May 25, 2012 using a self-administered questionnaire. Regarding the tools for this study, a structured questionnaire was used with proven reliability and feasibility, and the contents of the questionnaire consisted of 55 questions based on the related references. The subjects completed the questionnaire regarding the general characteristics, social support, and individual competency. Data analysis was processed using computerized system with SPSS 18.0. Statistical analysis techniques including frequency, percentage, T-test, ANOVA analysis and correlation. An analysis of the research subjects' social support level revealed a significant difference in the item of marital status and residence area (p<0.05). The average in the social support was indicated to be high with 3.33. An analysis of the research subjects' individual competency revealed a significant difference in the items of age, marital status, residence area, carrier, job position, education (p<0.05). The average in the individual competency was indicated to be high with 3.68. The correlation between social support and individual competency showed that most of the variables had an association, showing that more social support leads to more individual competency.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.34 no.4
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• pp.1215-1225
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• 2014

Volcanic rocks formed from magma near the earth surface commonly show vesicular structures due to exsolution of gaseous phases in magma. The distinction and the amount of vesicles are greatly various, but there are few researches on the effect of volume percentage of vesicles on the mechanical properties. In this study, mechanical characteristics of volcanic rocks in relation to the porosity are investigated through experimental tests with Jeju basalt. Two methods (the buoyancy method and the caliper method) are adopted for measuring porosity. And unconfined compressive strength, elastic modulus, tensile strength, and elastic wave velocity are plotted against porosity in order to propose the empirical relations after the regression analysis. Also, unconfined compressive strength and the elastic modulus in relation to the elastic wave velocity are proposed with the analysis. In the case of vesicular rocks with more than 5% porosity, it is found that the buoyancy method provides more accurate estimation of porosity than the caliper method. The unconfined compressive strength, the elastic modulus, and the elastic wave velocity decrease curvilinearly with increasing in porosity. Also, the unconfined compressive strength and the elastic modulus increase linearly with increasing in elastic wave velocity.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.6
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• pp.2889-2897
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• 2013

The purpose of this study was to analyze dental technician's individual competency and organizational commitment level and to examine its correlation. 200 dental technicians in Seoul, Incheon, and Chunchungnamdo area were selected. Survey was carried out from April 28, 2012 to May 25, 2012 by using self-administered questionnaire. As for the tools for this study, the structured questionnaire was used with its proven reliability and feasibility, and the contents of questionnaire consisted of 46 questions on the basis of related references. The subjects completed questionnaire regarding general characteristics, individual competency and organizational commitment. The data analysis was processed by computerized system with SPSS 18.0. Statistical analysis techniques included frequency, percentage, T-test, F-test analysis and regression analysis. As a result of analyzing the research subjects' individual competency level, there was significant difference in the item of age, marital status, residence area, carrier, job position, education(P<0.05). The average in the individual competency was indicated to be high with 3.68. As a result of analyzing the research subjects' organizational commitment level, there was difference in the item of gender, age, marital status, residence area, carrier, job position, education(P<0.05). The average of organizational commitment was indicated to be high with 3.46. Correlation between individual competency and organizational commitment, most of variables were indicated to have correlation, thereby having been shown that the more individual competency leads to the more organizational commitment.