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전한용,류중재,유충식,김의화,Jeon Han Yong,Ryu Jung Jae,Yoo Chungsik,Kim Eui Hwa 한국섬유공학회 2005 한국섬유공학회지 Vol.42 No.3
Effect of abrasion damage on the chemical resistance of geotextiles were evaluated. Three types of geotextiles were adopted for the abrasion damage test and four types of sandpapers were used to consider the soil particle size. After abrasion damage test, the chemical resistance of damaged geotextile was evaluated by the change of tensile strength of geotextile after immersion in acid solution of pH 3 and 12 at $25^{\circ}C$ or $50^{\circ}C$ for 30 days, respectively. From the results of abrasion damage test, it was seen that geotextile surface showed serious damage with increase in the particle size of sandpaper. Especially, the surface of needle punched nonwoven geotextile was easily abraded. For the $\#100,\;\#220$ sandpapers having large grain size, the retention ratio of tensile strength of the needle punched nonwoven geotextile decreased most seriously in the 200 cycle abrasion. But, for the $\#400\;and,\;\#800$ sandpapers having small grain size, the retention ratio of tensile strength of the woven geotextile decreased most seriously in the 200 cycle abrasion. Finally, it was seen that geotextiles showed no change in the tensile strength on immersion in acid solutions of pH 3 and pH 12 at $25^{\circ}C\;or\;50^{\circ}C$ for 30 days, respectively.
치과기공소 개설등록제도 개선방안에 대한 치과기공사의 인식조사: 치과의사의 치과기공소 개설등록제도를 중심으로
이혜은,류재경,이희경,김정숙,임중재,박범우,Lee, Hye-Eun,Ryu, Jae-Kyung,Lee, Hee-Kyung,Kim, Jung-Sook,Im, Joong-Jae,Park, Beom-Woo 대한치과기공학회 2021 대한치과기공학회지 Vol.43 No.1
Purpose: This study was conducted on dental technicians to examine the problems of the dental laboratory registration system and devise a plan to improve it. Methods: For data collection, an online survey was conducted on 14,015 dental technicians registered in the Korea Dental Technologist Association as of October 2020. Among the collected 405 questionnaires, 391 data were used for analysis. Results: We found that dental technicians felt that the dental laboratory opening registration system was unfair. There were problems including the problem of the verification method of job performance, not acknowledging the difference in the job field, and the lack of understanding of the structure of work cooperation between dentistry and dental laboratories. Furthermore, it was recognized that the system was improved by reflecting the change in job area according to the change of the times. Conclusion: There is an urgent need to reorganize the legal system so that the dental technicians can have their professionalism and autonomy recognized while remaining faithful to the public interest of protecting the national oral health by revising the related regulations, thereby ensuring smooth work activities.