http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
개별검색 DB통합검색이 안되는 DB는 DB아이콘을 클릭하여 이용하실 수 있습니다.
통계정보 및 조사
예술 / 패션
<해외전자자료 이용권한 안내>
- 이용 대상 : RISS의 모든 해외전자자료는 교수, 강사, 대학(원)생, 연구원, 대학직원에 한하여(로그인 필수) 이용 가능
- 구독대학 소속 이용자: RISS 해외전자자료 통합검색 및 등록된 대학IP 대역 내에서 24시간 무료 이용
- 미구독대학 소속 이용자: RISS 해외전자자료 통합검색을 통한 오후 4시~익일 오전 9시 무료 이용
※ 단, EBSCO ASC/BSC(오후 5시~익일 오전 9시 무료 이용)
( Young Chan Choi ), ( Jae Goo Lee ), ( Jae Ho Kim ), ( Jae Chang Hong ), ( Young Ku Kim ), ( Sang Jun Yoon ), ( See Hoon Lee ), ( Moon Hee Park ) 한국화학공학회 2006 Korean Journal of Chemical Engineering Vol.23 No.3
The purpose of this study is to analyze the accuracy of digital dental models acquired using cone beam computed tomography (CBCT), an electromagnetic wave method. While there are many reports comparing CBCT and intra oral scanners, there are few comparative studies on the accuracy of different digital dental models acquired using CBCT. Targeting this problem, in this study, we tried to analyze the accuracy of dental prosthesis data generated by different CBCT models with 3D computer programs. To this end, a single preparation dental model, 3-unit bridge dental model, and full dental model were selected and photographed using CBCT to obtain a DICOM file, which was later converted into an STL file. The converted STL file was analyzed qualitatively and quantitatively for trueness and precision using a 3D superimposition program. Although there were statistically significant differences in the trueness values of the three digital dental models (P < 0.05), no significant differences could be observed in the precision values (P > 0.05). In conclusion, using CBCT-based dental models, it may be difficult to fabricate dental prosthesis due to a distortion between the rounded part of the tooth, the prepared tooth, and adjacent teeth. However, if the accuracy of sharpness in CBCT images can be increased, in the future, this method may be employed to manufacture dental prosthesis for clinical applications.
PURPOSE. To compare and analyze trueness and precision of provisional crowns made using stereolithography apparatus and subtractive technology. MATERIALS AND METHODS. Digital impressions were made using a master model and an intraoral scanner and the crowns were designed with CAD software; in total, 22 crowns were produced. After superimposing CAD design data and scan data using a 3D program, quantitative and qualitative data were obtained for analysis of trueness and precision. Statistical analysis was performed using normality test combined with Levene test for equal variance analysis and independent sample t-test. Type 1 error was set at 0.05. RESULTS. Trueness for the outer and inner surfaces of the SLA crown (SLAC) were 49.6±9.3 μm and 22.5±5.1 μm, respectively, and those of the subtractive crown (SUBC) were 31.8±7.5 μm and 14.6±1.2 μm, respectively. Precision values for the outer and inner surfaces of the SLAC were 18.7±6.2 μm and 26.9±8.5 μm, and those of the SUBC were 25.4±3.1 μm and 13.8±0.6 μm, respectively. Trueness values for the outer and inner surfaces of the SLAC and SUBC showed statistically significant differences (P<.001). Precision for the inner surface showed significance (P<.03), whereas that for the outer surface showed no significance (P<.58). CONCLUSION. The study demonstrates that provisional crowns produced by subtractive technology are superior to crowns fabricated by stereolithography in terms of accuracy.
서울 수도권 지하철 망은 과거 수십 년 동안 도심지의 인구 분산, 교통 정체 해소 그리고 인접 도시의 활성화 등 다수의 목적을 위하여 여러 번의 진화 과정을 거쳐 왔다. 본 연구에서는 서울 수도권 망의 동적인 진화에 따라 지하철 망의 특성과 망의 효율이 어떻게 변화해 왔는지를 분석하였다. 아울러 본 연구에서는 지하철 망의 효율을 보다 현실적으로 나타낼 수 있는 새로운 척도를 제안하였다. 서울 지하철 망의 효율성은 74%로 외국의 값들보다 높게 나타났으며 승객의 실질적인 흐름을 고려하면 효율성은 85% 이상으로 더 높게 나타났다. 9호선과 신분당선, 의정부선과 에버라인 노선들은 2013년 9월 이후로 수송 실적 관련 자료를 공개하지 않기 때문에 본 연구에서는 분석 범위를 데이터가 존재하는 2008년 9월부터 2013년 9월로 국한하였다. The metropolitan subway network of Seoul has gone through many evolutionary processes in past decades to disperse the floating population and improve the traffic flow. In this study, we analyzed how the structural characteristics and the efficiency of the subway network have changed according to the dynamic evolutionary processes of the metropolitan subway network of Seoul. We have also proposed new measures that can be used to characterize the structural properties of the subway network more practically. It is shown that the global efficiency is about 74%, which is higher than those of subway networks of foreign countries. It should also be considered that passenger flow between stations is even higher, at about 85%. Since the private lines, including line 9, the New Bundang line, the Uijeongbu line, and the Ever line do not release their traffic data since September, 2013, only 5 years of data from September, 2008 to September, 2013 is available. So, in this study we limit the analysis period to these 5 years.
It has become one recent trend in literary criticism to use Georges Bataille`s theory as an efficient reading tool of D. H. Lawrence`s novels. Many literary critics successfully locate the radical affinity of Lawrence`s work with Bataille`s work in terms of the recurrent questioning of the representing authority and the highly provocative and experimental narrative style. Clearly these approaches cannot be easily ignored as opportunistic revision of D. H. Lawrence studies. In fact, both Lawrence and Bataille are intellectually indebted to Lev Shestov. They embrace the unique combination of non-dogmatic thinking and aphoristic narrative style in Shestov`s work. And the inventory of the Shestovian properties in the works of Lawrence and Bataille is rather extensive. However, any unmediated application of Bataille`s theory to Lawrence`s work fails. To appreciate and substantiate the complexity of the relationship between them we need to investigate their deceptively close similarities.
This study measures retentive force as function of the diameter, the cross-head speed, and the number of detachments of dental magnetic attachments in a clinical environment, and analyzes the validity of the international standard method for testing them. In this study, tests 1, 2, and 3 were used to measure the retentive force as a function of the contact area of the magnetic attachment, and tests 2 and 4 as a function of the cross-head speed. Test 2 and 5 compared function of the retentive force as a function of repeated detachments Results showed that the retentive force increases as the sample surface increases, and decreases as the cross head speed increases. Additionally, after 1500 detachment cycles, the retentive force increased. Finally, the international standard test method was validated, because an objective method for testing magnetic attachments in clinical environment could not be found.