• 제목/요약/키워드: master files

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3D 가상현실기반의 발표훈련시스템 (Presentation Training System based on 3D Virtual Reality)

  • 정영기
    • 문화기술의 융합
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    • 제4권4호
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    • pp.309-316
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    • 2018
  • 본 연구에서는 실제와 같은 가상발표환경을 구현하여 실전에서 자신감 있게 발표할 수 있도록 도와주기 위한 3D 가상현실기반의 발표훈련시스템을 제안한다. 제안시스템은 발표자의 음성과 행동을 실시간으로 분석하여 가상공간의 청중들에게 반영되게 함으로서 사실감 있고 몰입도 높은 발표 및 면접 환경을 제공하였다. 발표자는 6DOF Tracking이 되는 HMD와 VR Controller를 착용하고 Kinect를 이용하여 가상공간 속에서의 시점 변화 및 인터랙션을 줄 수 있으며 가상공간은 사용자가 설정한 다양한 환경으로 변경이 가능하도록 하였다. 발표자는 가상공간 속에 별도로 제공되는 뷰에 표시된 프리젠테이션 파일 및 스크립트를 보며 내용 숙지 및 발표 숙달 연습을 하게 된다.

The effect of different confluence confirmation strategies on the obturation of Vertucci type II canal: micro-CT analysis

  • Seungjae Do ;Min-Seock Seo
    • Restorative Dentistry and Endodontics
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    • 제46권1호
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    • pp.12.1-12.9
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    • 2021
  • Objectives: The present study aims to compare the obturation quality of 2 confluence confirmation techniques in artificial maxillary first premolars showing Vertucci type II root canal configuration. Materials and Methods: Thirty artificial maxillary premolars having Vertucci type II root canal configuration were made. They were divided into 3 groups according to the confluence confirmation technique as follows. Gutta-percha indentation (GPI) group (confluence confirmation using a gutta-percha cone and a K file); electronic apex locator (EAL) group (confluence confirmation using K files and EAL); and no confluence detection (NCD) group. In the GPI group and the EAL group, shaping and obturation were performed with the modified working length (WL). In the NCD group, shaping was performed without WL adjustment and obturation was carried out with an adjusted master cone. Micro-computed tomography was used before preparation and after obturation to calculate the percentage of gutta-percha occupied volume (%GPv) and the volume increase in the apical 4 mm. Data were analyzed using 1-way analysis of variance and post hoc Tukey's test. Results: Statistically significant difference was not found in terms of the %GPv from the apex to apical 4 mm. However, the NCD group showed a statistically significant volume increase compared with the EAL group (p < 0.05). Conclusions: In terms of gutta-percha occupied volume, no significant difference was observed among the 3 groups. Confluence confirmation using an EAL in teeth with Vertucci type II configuration showed less volume increase during canal shaping compared with no confluence confirmation.

임플란트 디지털 인상용 코핑의 정확성 비교 (Comparison of the accuracy of implant digital impression coping)

  • 안교진;이준석
    • 구강회복응용과학지
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    • 제36권1호
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    • pp.29-40
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    • 2020
  • 목적: Encoded healing abutment와 scan body를 이용한 디지털 인상과 pick-up 인상용 코핑을 이용한 인상 채득법의 정확도를 다른 임플란트 식립 각도에서 비교 연구하고자 하였다. 연구 재료 및 방법: 3D 프린터를 이용해 주모형을 제작하고 0°, 10° 및 20°의 근심경사로 3개의 임플란트를 위치 시켰다. 각각의 임플란트에 지대주를 체결하고 주모형을 스캔하여 참조 모델을 만들었다. P군 모델은 pick-up 인상용 코핑을 사용하여 15개의 석고 모형을 만들고 지대주를 장착 후 스캔하여 제작하였다. E군과 S군의 모델은 각각 encoded healing abutment와 scan body를 주모형에 체결하고 구내 스캐너를 이용해 15회씩 인상채득을 하여 제작하였다. 각각의 실험군 STL 파일은 best fit alignment를 이용해 참조 모델과 중첩하였고 root mean square (RMS) 값을 분석하였다. 결과: RMS 값은 P군에서 가장 작았고(25.56 ± 2.53 ㎛), 그다음 S군(35.27 ± 2.56 ㎛), E군(38.29 ± 4.12 ㎛) 순 이었다. S군과 E군 사이에는 유의차가 없었고, P군은 S군과 E군 보다 작았다(P < 0.05). 임플란트 각도와 RMS 값의 상관관계는 E군에서 유의하였다(P < 0.05). 결론:Pick-up 인상용 코핑 방법은 encoded healing abutment와 scan body 인상 채득 방법에 비해 더 높은 정확도를 보였고 encoded healing abutment와 scan body 인상 방법은 정확도에서 유의한 차이가 없었다. Encoded healing abutment의 임상적 사용은 가능하나 경사진 임플란트의 인상의 경우 주의하여 사용해야 할 것으로 사료된다.

도면(圖面) 명세관리(明細管理)를 위한 데이터베이스 설계(設計) (Design for Database of Technical Data Configuration Management System)

  • 김재수
    • 정보관리연구
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    • 제19권1호
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    • pp.50-72
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    • 1988
  • 데이터베이스는 MIS의 기초(基礎)이며 기술자료(技術資料) (TDP)는 연구개발(硏究開發) 활동(活動)의 중요한 요소(要素)의 하나이다. 각(各) 연구소(硏究所)에서는 MIS를 발전(發展)시켜 왔으며 기술자료(技術資料)에 대한 MIS도 많이 개발(開發)되어 운용(運用)되고 있다. 그러나 연구개발(硏究開發)의 결과(結果)로 생성(生成)된 도면(圖面) 및 관련(關聯)된 기술자료(技術資料)의 MIS 및 운용(運用)은 미진(未盡)하다고 생각된다. 본(本) 연구(硏究)는 도면(圖面), 규격(規格) 및 관련기술자료(關聯技術資料) MIS를 위한 데이터베이스 형성(形成)에 대한 고찰(考察)로서 MIS의 일반개념(一般槪念)과 데이터베이스에 관한 이론(理論)을 살피고 도면(圖面), 규격(規格) 및 관련기술자료(關聯技術資料)의 MIS에 필요(必要)한 데이터베이스 설계(設計)를 수행(遂行)하였다. 설계결과(設計結果) 중 시험적(試驗的)으로 3 개(個)의 마스터 파일 및 6 개(個)의 변수 파일에 대하여 CYBER 시스템의 Total을 사용(使用)하여 데이터베이스를 형성(形成)하였고 2 개(個)의 간단한 입력(入力) 및 출력(出力) 응용(應用)프로그램과 그 결과(結果)를 보임으로써 운용(運用) 가능(可能)함을 보였다. 본(本) 연구결과(硏究結果)의 보완(補完) 및 응용(應用) 프로그램 개발(開發)로써 기술자료(技術資料) MIS 발전(發展)에 도움이 될 수 있기를 기대한다.

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병원 급식시설의 미생물적 품질관리를 위한 전산 프로그램개발에 관한 연구 (Development of a Computer-Assisted Microbiological Quality Assurance Program for Hosipital Foodservice Operations)

  • 곽동경;장혜자;주세영
    • 한국식품조리과학회지
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    • 제8권2호
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    • pp.137-145
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    • 1992
  • A computer-assisted microbiological quality assurance program was developed based on HACCP data obtained from a 500 bed general hospital by assessing time and temperature conditions and microbiological qualities of six categories of menu items according to the process of food product flow. The purpose of the study was to develop a computer-assisted microbiological quality assurance program in order to simplify the assessment procedures and to provide a maximum assurance to foodservice personnel and the public. A 16-Bit personnel computer compatible with IBM-PC/AT was used. The data base files and processing programs were created using dBASE III plus packages. The contents of the computerized system are summarized as knows: 1. When the input program for hazard analysis runs, a series of questions are asked to determine hazards and assess their severity and risks. Critical control points and monitoring methods for CCPs are identified and saved in Master file. 2. Output and search programs for hazard analysis are composed of 6 categories of recipe data file list, code identification list, and HACCP identification of the specific menu item. 3. When the user selects a specific category of recipe from 6 categories presented on the screen and runs data file list, a series of menu item list, CCP list, monitoring methods list are generated. When the code search program runs, menu names, ingredients, amounts and a series of codes are generated. 4. When the user types in a menu item and an identification code, critical control points and monitoring methods are generated for each menu item.

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Bacterial leakage and micro-computed tomography evaluation in round-shaped canals obturated with bioceramic cone and sealer using matched single cone technique

  • Yanpiset, Kallaya;Banomyong, Danuchit;Chotvorrarak, Kanet;Srisatjaluk, Ratchapin Laovanitch
    • Restorative Dentistry and Endodontics
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    • 제43권3호
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    • pp.30.1-30.12
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    • 2018
  • Objectives: To evaluate sealing ability of root canals obturated with bioceramic-impregnated gutta percha cone (BCC) or gutta percha (GP), with bioceramic sealer (BCS) or AH Plus (AH; Dentsply-Maillefer), in roundly-prepared canals using matched single-cone technique, based on bacterial leakage test, and to analyze obturation quality using micro-computed tomography (CT) analysis. Materials and Methods: Ninety-two distobuccal roots of maxillary molars were prepared using nickel-titanium files to apical size 40/0.06. The roots were divided into 4 groups (n = 20) that were obturated with a master cone and sealer: GP/AH, BCC/AH, GP/BCS, and BCC/BCS. Bacterial leakage model using Enterococcus faecalis was used to evaluate sealing ability for 60-day period. Obturated samples from each group (n = 4) were analyzed using micro-CT. Results: All groups showed bacterial leakage at 20%-45% of samples with mean leakage times of 42-52 days. There were no significant differences in bacterial leakage among the groups. Micro-CT showed minimal gaps and voids in all groups at less than 1%. Conclusions: In roundly-prepared canals, the single cone obturation with BCC/BCS was comparable to GP/AH for bacterial leakage at 60 days.

단토의 '철학하는 예술' 개념에 대한 비판적 고찰 (A Critical Study on Arthur C. Danto's' Philosophizing Art')

  • 김백균
    • 미술이론과 현장
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    • 제10호
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    • pp.183-202
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    • 2010
  • The term "philosophizing art" was coined by Arthur Danto, who tried to define new forms of art, especially Andy Warhol's pop art appeared in New York after 1960's, which could not be explained by traditional concept of "representation". As Danto said "the term 'philosophizing art' is unclear, whether art discusses philosophical issues or art is the object of philosophic discussions", it does not seem like Danto himself had a specific idea when he used this term. The background for Danto coining this term derives from the fact that the old art concept such as denotation and connotation could not fully explain phenomenalistic aspects of concept art which appeared frequently at that time. Many articles in his book "philosophizing art", in which many of his criticism are included, mainly say that art begins philosophizing by dealing with not mimesis or representation but concepts. According to his argument, the history of western art, which has been consisted of mimesis and representation, has come to end when art is about physically embodied with meaning. Of course, as Danto say so, what goes to end is not art itself, but the narrative of art. It means master narrative saying art should be shown different from nature or artificial daily product is over. Danto could not find principals of mimesis and representation which had been main logic in the western art history, when he saw Andy Warhol's Brillo Boxes at Stable Gallery, New York in 1964. Danto questioned "if we can not distinguish Brillo box's artistic aspects visually from other factory-made products, how can we distinguish art from non-art", By answering those questions, he discovered two facts which made him realize the end of Art: One is there is no special way in which works of art have to be shown or has to exist. Therefore, art history has proven that commercial boxes, trashes and files of underwear can be a work of art. The other is we have fully recognized it at the end of 20thcentury. Danto confessed that through Brillo Boxes, he realized the works of art are decided by something can not be seen by eyes, not by distinguished differences by looking at it. This thesis is trying to show personal understanding about art, philosophy and discourses surrounding them and to figure out how Dante opened a new world to art criticism by using new definitions such as 'end of art' and 'philosophizing art' which Danto used to explain inner aspects of art.

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세 가지 방식으로 제작한 하악 총의치의 중합 전후에 따른 인공치아 위치 3차원 분석 (Three-dimensional analysis of artificial teeth position according to three type complete mandibular denture before and after polymerization)

  • 박진영;김동연;김원수;이광영;정일도;배소연;김지환;김웅철
    • 대한치과기공학회지
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    • 제40권4호
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    • pp.217-224
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    • 2018
  • Purpose: The aim of this study was to evaluate accuracy of three type complete mandibular denture of before and after polymerization. Methods: Mandibular edentulous model was selected as the master model. 15 study models were made by Type IV stone. Wax complete mandibular dentures were produced by the denture base and artificial teeth. Before and after curing, STL files were obtained using a blue scanner. By superimposing the digitized complete mandibular denture data(after curing) with the CAD-reference(before curing) three-dimensionally, visual fit-discrepancies were drawn by calculating the root mean square (RMS) and visualized on a color-difference map. Each calculated RMS-value was statistically analyzed by 1-way analysis of variance(ANOVA) (${\alpha}=.05$). Results: Mean(SD) RMS-values was OM group $88.98(6.10){\mu}m$, BM group $82.35(13.46){\mu}m$, BDM group $77.83(9.46){\mu}m$. The results of the 1-way ANOVA showed no statistically significant differences in the RMS values of the Three groups for the material (P > .241). Conclusion : Deformation of artificial teeth position was observed in all groups after resin polymerization. But the values, all group were within the clinically acceptable range. The values of BDM group showed the least deformation than the other two groups.

다양한 삼차원 프린팅 시스템으로 제작된 다이의 정확도 비교 (Accuracy of dies fabricated by various three dimensional printing systems: a comparative study)

  • 백주원;신수연
    • 구강회복응용과학지
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    • 제36권4호
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    • pp.242-253
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    • 2020
  • 목적: 이 연구의 목적은 3D 프린팅으로 제작된 다이의 정확도를 인상재와 치과용 석고를 이용하여 제작한 기존 방식 다이와 비교하고 체적 변화를 평가하여 정확도를 비교하는 것이다. 연구 재료 및 방법: 치과용 모델 하악 우측 제1대구치를 준비하여 스캔한 뒤 polyetherketoneketone (PEKK)으로 기준 다이를 제작한다. 기존 방식 다이는 기준 다이를 polyvinylsiloxane로 인상채득한 뒤 Type IV 치과용 석고를 부었다. 3D 프린팅 시스템의 경우 기준 다이를 스캔하고 3개의 서로 다른 3D 프린터를 이용하여 모델로 변환하였다. 4가지 방법으로 각각 10개의 표본을 만들었다. 3D 표면매칭 소프트웨어를 사용하여 기준 다이와 중첩하였다. 통계 분석을 위해 Kruskal-Wallis test, Mann-Whitney U test를 수행하였다(P < 0.05). 결과: 기준 다이와 비교하여 기존 방식, Stereolithography로 제작된 다이를 제외하고는 각 방식으로 제작된 다이의 체적 변화가 상당히 있었다(P < 0.05). 기존 방식으로 제작된 다이는 3D 프린팅된 다이보다 체적 변화가 가장 적었다(P < 0.05). Stereolithography로 제작된 3D 프린팅 다이는 다른 3D 프린터 중에서 체적 변화가 가장 적었다(P < 0.05). 결론: 기존 방식의 다이는 3D 프린팅 다이보다 더 정확했지만 3D 프린팅 다이는 임상적으로 허용되는 범위 내에 있었다. 따라서 3D 프린팅 다이는 수복물 제작에 사용할 수 있다.

Why A Multimedia Approach to English Education\ulcorner

  • Keem, Sung-uk
    • 대한음성학회:학술대회논문집
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    • 대한음성학회 1997년도 7월 학술대회지
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    • pp.176-178
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    • 1997
  • To make a long story short I made up my mind to experiment with a multimedia approach to my classroom presentations two years ago because my ways of giving instructions bored the pants off me as well as my students. My favorite ways used to be sometimes referred to as classical or traditional ones, heavily dependent on the three elements: teacher's mouth, books, and chalk. Some call it the 'MBC method'. To top it off, I tried audio-visuals such as tape recorders, cassette players, VTR, pictures, and you name it, that could help improve my teaching method. And yet I have been unhappy about the results by a trial and error approach. I was determined to look for a better way that would ensure my satisfaction in the first place. What really turned me on was a multimedia CD ROM title, ELLIS (English Language Learning Instructional Systems) developed by Dr. Frank Otto. This is an integrated system of learning English based on advanced computer technology. Inspired by the utility and potential of such a multimedia system for regular classroom or lab instructions, I designed a simple but practical multimedia language learning laboratory in 1994 for the first time in Korea(perhaps for the first time in the world). It was high time that the conventional type of language laboratory(audio-passive) at Hahnnam be replaced because of wear and tear. Prior to this development, in 1991, I put a first CALL(Computer Assisted Language Learning) laboratory equipped with 35 personal computers(286), where students were encouraged to practise English typing, word processing and study English grammar, English vocabulary, and English composition. The first multimedia language learning laboratory was composed of 1) a multimedia personal computer(486DX2 then, now 586), 2) VGA multipliers that enable simultaneous viewing of the screen at control of the instructor, 3) an amplifIer, 4) loud speakers, 5)student monitors, 6) student tables to seat three students(a monitor for two students is more realistic, though), 7) student chairs, 8) an instructor table, and 9) cables. It was augmented later with an Internet hookup. The beauty of this type of multimedia language learning laboratory is the economy of furnishing and maintaining it. There is no need of darkening the facilities, which is a must when an LCD/beam projector is preferred in the laboratory. It is headset free, which proved to make students exasperated when worn more than- twenty minutes. In the previous semester I taught three different subjects: Freshman English Lab, English Phonetics, and Listening Comprehension Intermediate. I used CD ROM titles like ELLIS, Master Pronunciation, English Tripple Play Plus, English Arcade, Living Books, Q-Steps, English Discoveries, Compton's Encyclopedia. On the other hand, I managed to put all teaching materials into PowerPoint, where letters, photo, graphic, animation, audio, and video files are orderly stored in terms of slides. It takes time for me to prepare my teaching materials via PowerPoint, but it is a wonderful tool for the sake of presentations. And it is worth trying as long as I can entertain my students in such a way. Once everything is put into the computer, I feel relaxed and a bit excited watching my students enjoy my presentations. It appears to be great fun for students because they have never experienced this type of instruction. This is how I freed myself from having to manipulate a cassette tape player, VTR, and write on the board. The student monitors in front of them seem to help them concentrate on what they see, combined with what they hear. All I have to do is to simply click a mouse to give presentations and explanations, when necessary. I use a remote mouse, which prevents me from sitting at the instructor table. Instead, I can walk around in the room and enjoy freer interactions with students. Using this instrument, I can also have my students participate in the presentation. In particular, I invite my students to manipulate the computer using the remote mouse from the student's seat not from the instructor's seat. Every student appears to be fascinated with my multimedia approach to English teaching because of its unique nature as a new teaching tool as we face the 21st century. They all agree that the multimedia way is an interesting and fascinating way of learning to satisfy their needs. Above all, it helps lighten their drudgery in the classroom. They feel other subjects taught by other teachers should be treated in the same fashion. A multimedia approach to education is impossible without the advent of hi-tech computers, of which multi functions are integrated into a unified system, i.e., a personal computer. If you have computer-phobia, make quick friends with it; the sooner, the better. It can be a wonderful assistant to you. It is the Internet that I pay close attention to in conjunction with the multimedia approach to English education. Via e-mail system, I encourage my students to write to me in English. I encourage them to enjoy chatting with people all over the world. I also encourage them to visit the sites where they offer study courses in English conversation, vocabulary, idiomatic expressions, reading, and writing. I help them search any subject they want to via World Wide Web. Some day in the near future it will be the hub of learning for everybody. It will eventually free students from books, teachers, libraries, classrooms, and boredom. I will keep exploring better ways to give satisfying instructions to my students who deserve my entertainment.

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