• 구강회복응용과학지
• /
• 제39권4호
• /
• pp.250-259
• /
• 2023

임플란트를 이용한 고정성 보철 치료에 있어 디지털 기술의 활용은 환자의 임상적, 방사선학적 정보를 통합하여 진단 및 가상 수술을 통해 예지성 있는 치료를 가능하게 한다. 기존의 디지털 스캐닝 방법은 치유지대주 제거 및 스캔 바디 연결 등 여러 번의 구성요소 착탈이 필요하다. 이러한 점을 고려하여 개발된 스캔 가능한 치유지대주는, 스캐닝이 치유 지대주상에서 직접 수행되어 연조직 봉쇄가 유지되며 스캐닝이 간소화된다. 악간관계 채득시에도 디지털 기술을 활용할 수 있는데, 최근에는 수술 가이드, 환자 맞춤형 스캐닝 장치 또는 임시의치 내면 스캔 등을 이용해 무치악 환자들의 악간 관계를 채득하는 여러 디지털 기술들이 보고되고 있다. 본 증례에서는 스캔가능한 치유지대주 및 임시의치 내면 스캐닝을 통한 악간 관계 채득을 통해 고정성 임플란트 수복치료를 시행함으로써 치료과정을 간소화하고 심미적, 기능적으로 우수한 임상 결과를 얻었기에 보고하고자 한다.

• 한국미생물·생명공학회지
• /
• 제14권2호
• /
• pp.175-179
• /
• 1986

Cellulose분해력이 높은 Cellulomonas flavigena NCIB 12901의 원형질체 융합을 위한 원형질체의 형성조건을 조사하여 본 결과 배양기간에 따라 원형질체의 형성율이 매우 달라져 대수증식기 말기보다는 중기때의 세포를 lysozyme처리하는 것이 더 효율적이며 lysozyme 400$\mu\textrm{g}$/$m{\ell}$ 농도로 6시간처리 하여 95% 이상이 형성됨을 관찰할 수 있었다. 또한 원형질체 형성확인법으로 osmotic shock에 의한 원형질체 계수법은 spheroplast의 형성과 원형질체의 형성이 구별되어 지지 않으므로 그 결과가 전자현미경상으로 직접 관찰된 결과와 일치하지 않는 경우가 있어 전자현미경으로의 관찰이 뒤따라야 하는 것을 알 수 있었다.

• 수산해양교육연구
• /
• 제29권2호
• /
• pp.503-512
• /
• 2017

Over the past few years, as maritime trade and traffic were highly expanding, problem of invasive species via ballast water have been raised. In 1988, Canada and Australia had firstly experience that unexpected and hazardous species were observed on their own sea, they have issued the problem to MEPC under the IMO. At the end of many years of discussion, on the diplomatic conference in 13 Feb. 2004, "International Convention for the Control and Management of Ballast Water and Sediments of the Ship" was adopted. Requirements for entering into force of this Convention is that 30 countries ratify and world merchant marine fleet is more than 35% and BWM Convention will be effected after 12months from date satisfying conditions. With Finland ratifying the BWM Convention on 8 Sep. 2016, the fleet amounted to 35.1441% and ratification country became 52 countries. Therefore, after 12month, BWM Convention will be formally effected on 8 Sep. 2017. Ballast Water Treatment System is to be fitted in new ships as well as existing ships. Thus, there are concerns of ship owners to be suitably installed a variety typed BWTS in many kinds of vessels. As approaching for resolving these problems, engineering analysis was carried out research studies and detailed design to analyze to optimal installation space for retrofitting a BWTS using 3D Scanning method, targeting representative DWT 180K Bulk carrier of dry cargo vessels charged more 40% on worldwide vessel and mainly two type BWTS as electrolysis treatment type and ultra violet treatment type. Optimal design of 3D Scanning technology was applied to analyze four step process and the overall conclusion was described in this paper.

• 한국지반환경공학회 논문집
• /
• 제13권5호
• /
• pp.51-57
• /
• 2012

본 연구에서는 친환경적인 그라우트재의 개발을 위하여 연약지반에 대한 바이오그라우트 가능성을 확인하고, Bacillus Pasteurii 균을 이용하여 탄산칼슘 침전 효과를 분석하였다. 연약지반에 미생물의 탄산칼슘 침전을 이용하여 바이오그라우트에 미치는 영향을 알아보기 위해 4가지 시료의 조건(멸균 시료, 비멸균 시료, 반응용액과 미생물용액의 선처리 혼합시료, 반응용액과 미생물용액의 후처리 혼합시료)으로 실험되었다. 전자현미경(SEM), EDX와 X선 분석 회절기(XRD)를 이용하여 연약지반 시료의 분석을 수행하였고, 이러한 연구결과를 바탕으로 탄산칼슘 침전을 이용한 미생물 처리 공법은 바이오그라우트의 특성을 개선하였다.

• Carbon letters
• /
• 제12권1호
• /
• pp.16-20
• /
• 2011

Commercial PAN fibers were thermally stabilized at 220 or $240^{\circ}C$ for 30 min. Those fibers were further stabilized using radio-frequency (RF) capacitive plasma discharge during 5 or 15 min. From Fourier transform infrared spectroscopy results, it was observed that an additional plasma treatment led to further stabilization of PAN fibers. After stabilization, carbonization was performed to investigate the final tensile properties of the fabricated carbon fibers (CFs). The results revealed that a combination of thermal and plasma treatment is a possible stabilization process for manufacturing CFs. Morphology of CFs was investigated using scanning electron microscopy. The morphology shows that the plasma stabilization performed by the RF large gap plasma discharge may damage the surface of the CF, so it is necessary to select a proper process condition to minimize the damage.

• 한국주조공학회지
• /
• 제31권5호
• /
• pp.262-266
• /
• 2011

The aim of this study is to investigate aging behavior of A356 alloy for turbo charger part. The specimen was fabricated by investment casting. Solution heat treatment was performed at $525^{\circ}C$ for 8h and followed by aging treated at $160^{\circ}C$, $170^{\circ}C$ for 0.5~20h. And their microstructures and mechanical properties of the aged specimens were analyzed by scanning electron microscope and hardness tester, respectively. All the cast A356 alloy included eutectic Si particles. In the cast A356 alloy, eutectic Si phase mainly was formed along Chinese script phase. Vickers hardness of the cast was improved by aging treatment due to formation of ${\beta}$" phase and ${\beta}$' phase.

• 한국식품영양학회지
• /
• 제1권2호
• /
• pp.1-8
• /
• 1988

The morphological changes of fresh beef treated with ficin(0.1% : 35$^{\circ}C$ 2hrs, 6hr,) were examined with scanning electron microscope(SEM), the results obtained were as follows ; Connective tissue protein in fresh beef treated with ficin was occurred solubilization with time and gradually trasformed from a definite form into amorphous form, followed by showing an opening-up phenomenon again and subdivision. Myofibrillar protein was cracked and breaked slightly, followed subdivision with time.

• 한국염색가공학회지
• /
• 제21권3호
• /
• pp.19-25
• /
• 2009

Polymerization of tetraethoxysilane on a glass substrate was investigated by remote microwave plasma using argon with portions of nitrous oxide as carrier gas. Transparent layer like a thickness of 0.5 ${\mu}m$ 3 ${\mu}m$ were obtained, differing in chemical composition, depending on plasma power and treatment time as well as on ageing time. In general the milder the treatment and the shorter the ageing was, the higher was the content of organic structural elements in the layer. We have identified that the chemical structure of our samples composed of mainly Si O and Si C groups containing aliphatics, carbonyl groups. These results were obtained by X ray photon spectroscopy, Fourier transformed infrared spectroscopy, and scanning electron microscope combined with Energy dispersive X ray spectroscopy.

• 보존과학회지
• /
• 제37권1호
• /
• pp.25-33
• /
• 2021

To extend the application of digital technology to the replication of artifacts, meticulous details of the process and the diversity of three-dimensional (3D) printing output materials need to be supplemented. Thus, in this study, a bronze mirror with Hwangbichangcheon inscription was digitalized by 3D scanning, converted into a voxel model, and virtual conservation treatment was performed using a haptic device. Furthermore, the digital mold of the bronze mirror completed by Boolean modeling was printed using a 3D sand-printer. Such contactless replication based on digital technology reflects the stability, precision, expressivity, collectivity, durability, and economic feasibility of artifacts. Its application can be further extended to cultural products as well as such areas as education, exhibition, and research. It is expected to be in high demand for metal artifacts that require casting. If empirical studies through experimental research on casting are supplemented in the future, it could extend the application of digital technology-based contactless replication methods.

• Imaging Science in Dentistry
• /
• 제47권2호
• /
• pp.117-122
• /
• 2017

Purpose: The aim of this study was to compare the use of 3-dimensional (3D) laser scanning and cone-beam computed tomography (CBCT) as methods of root surface measurement. Materials and Methods: Thirty teeth (15 maxillary first premolars and 15 mandibular first premolars) from 8 patients who required extractions for orthodontic treatment were selected. Before extraction, pre-treatment CBCT images of all the patients were recorded. First, a CBCT image was imported into simulation software (Mimics version 15.01; Materialise, Leuven, Belgium) and the root surface area of each tooth was calculated using 3-Matic (version 7.01, Materialise, Leuven, Belgium). After extraction, all the teeth were scanned and the root surface area of each extracted tooth was calculated. The root surface areas calculated using these 2 measurement methods were analyzed using the paired t-test (P<.05). Correlations between the 2 methods were determined by calculating the Pearson correlation coefficient. The intraclass correlation coefficient(ICC) was used to assess intraobserver reliability. Results: The root surface area measurements ($230.11{\pm}41.97mm^2$) obtained using CBCT were slightly greater than those ($229.31{\pm}42.46mm^2$) obtained using 3D laser scanning, but not significantly (P=.425). A high Pearson correlation coefficient was found between the CBCT and the 3D laser scanner measurements. The intraobserver ICC was 1.000 for 3D laser scanning and 0.990 for CBCT. Conclusion: This study presents a novel CBCT approach for measuring the root surface area; this technique can be used for estimating the root surface area of non-extracted teeth.