• Nuclear Engineering and Technology
• /
• 제53권1호
• /
• pp.188-198
• /
• 2021

A modern approach to nuclear energy involves reprocessing like transmutations of spent nuclear fuel products to reduce their radiotoxicity and time needed for their storage. For this purpose, they are immobilized in inert matrices made of zirconia and can be "burned" in fast neutron reactor or Accelerator Driven System. These matrices in spherical form can be obtained by sol-gel process. The paper presents a method of microspheres fabrication based on the combined Complex Sol-Gel Process and double extraction process consisting in the preparation of zirconium-ascorbate sol and simultaneous extraction of water and nitrates. The procedure allows obtaining gel microspheres with a diameter of 50 ㎛, which after heat treatment are processed into the final product. The synthesis of zirconia microspheres with Yttrium by internal gelation process is well known for over a decade now. However, the explanation and characterization of synthesis of such material by extraction of water process is rarely found. Parameters such as: pH, viscosity, shape, sphericity and crystal structure have been determined for synthesized products and semi-products. In addition, preliminary research consisting in irradiation of the obtained materials in fast and thermal neutron flux was carried out. The obtained results are presented and described in this work.

• Journal of Information Processing Systems
• /
• 제18권4호
• /
• pp.480-488
• /
• 2022

Images of tobacco retail licenses have complex unstructured characteristics, which is an urgent technical problem in the robot process automation of tobacco marketing. In this paper, a novel recognition approach using a double attention mechanism is presented to realize the automatic recognition and information extraction from such images. First, we utilized a DenseNet network to extract the license information from the input tobacco retail license data. Second, bi-directional long short-term memory was used for coding and decoding using a continuous decoder integrating dual attention to realize the recognition and information extraction of tobacco retail license images without segmentation. Finally, several performance experiments were conducted using a largescale dataset of tobacco retail licenses. The experimental results show that the proposed approach achieves a correction accuracy of 98.36% on the ZY-LQ dataset, outperforming most existing methods.

• 한국물환경학회지
• /
• 제21권3호
• /
• pp.219-229
• /
• 2005

The analytical methods for dioxins in water sample from wastewater to tap water were reviewed. For extraction method, liquid-liquid extraction (LLE) has been widely used, however, this process needs too much time and man power. New approach including solid phase extraction (SPE) is now applicable to large volume of water sample with high extraction efficiency. Column clean up in classical analytical methods were very complex and time consuming procedures during decade. Modifications were tried to decrease solvent and reagents volume. Moreover, use of column connection method has been demonstrated in the environmental matrices. Instrumental configurations also have been improved, in which GC/MS/MS with large volume injection approach can analyze picogram levels. Absolute sensitivities of HRMS increased compared to old versions of double focusing sector type mass spectrometers. Based on these analytical evolutions during last 10 years, we tried to optimize the analytical method for dioxins in water sample from sample extraction to instrumental analysis.

• Journal of Periodontal and Implant Science
• /
• 제47권6호
• /
• pp.372-380
• /
• 2017

Purpose: The aim of this prospective pilot study was to compare alveolar ridge preservation (ARP) procedures with open-healing approach using a single-layer and a double-layer coverage with collagen membranes using radiographic and clinical analyses. Methods: Eleven molars from 9 healthy patients requiring extraction of the maxillary or mandibular posterior teeth were included and allocated into 2 groups. After tooth extraction, deproteinized bovine bone mineral mixed with 10% collagen was grafted into the socket and covered either with a double-layer of resorbable non-cross-linked collagen membranes (DL group, n=6) or with a single-layer (SL group, n=5). Primary closure was not obtained. Cone-beam computed tomography images were taken immediately after the ARP procedure and after a healing period of 4 months before implant placement. Radiographic measurements were made of the width and height changes of the alveolar ridge. Results: All sites healed without any complications, and dental implants were placed at all operated sites with acceptable initial stability. The measurements showed that the reductions in width at the level 1 mm apical from the alveolar crest (including the bone graft) were $-1.7{\pm}0.5mm$ in the SL group and $-1.8{\pm}0.4mm$ in the DL group, and the horizontal changes in the other areas were also similar in the DL and SL groups. The reductions in height were also comparable between groups. Conclusions: Within the limitations of this study, single-layer and double-layer coverage with collagen membranes after ARP failed to show substantial differences in the preservation of horizontal or vertical dimensions or in clinical healing. Thus, both approaches seem to be suitable for open-healing ridge preservation procedures.

• Journal of Periodontal and Implant Science
• /
• 제46권6호
• /
• pp.415-425
• /
• 2016

Purpose: The present study investigated the impact of 2 different suture techniques, the conventional crossed mattress suture (X suture) and the novel hidden X suture, for alveolar ridge preservation (ARP) with an open healing approach. Methods: This study was a prospective randomized controlled clinical trial. Fourteen patients requiring extraction of the maxillary or mandibular posterior teeth were enrolled and allocated into 2 groups. After extraction, demineralized bovine bone matrix mixed with 10% collagen (DBBM-C) was grafted and the socket was covered by porcine collagen membrane in a double-layer fashion. No attempt to obtain primary closure was made. The hidden X suture and conventional X suture techniques were performed in the test and control groups, respectively. Cone-beam computed tomographic (CBCT) images were taken immediately after the graft procedure and before implant surgery 4 months later. Additionally, the change in the mucogingival junction (MGJ) position was measured and was compared after extraction, after suturing, and 4 months after the operation. Results: All sites healed without any complications. Clinical evaluations showed that the MGJ line shifted to the lingual side immediately after the application of the X suture by $1.56{\pm}0.90mm$ in the control group, while the application of the hidden X suture rather pushed the MGJ line slightly to the buccal side by $0.25{\pm}0.66mm$. It was demonstrated that the amount of keratinized tissue (KT) preserved on the buccal side was significantly greater in the hidden X suture group 4 months after the procedure (P<0.05). Radiographic analysis showed that the hidden X suture had a significant effect in preserving horizontal width and minimizing vertical reduction in comparison to X suture (P<0.05). Conclusions: Our study provided clinical and radiographic verification of the efficacy of the hidden X suture in preserving the width of KT and the dimensions of the alveolar ridge after ARP.

• 분석과학
• /
• 제31권2호
• /
• pp.65-70
• /
• 2018

이 연구에서는 대규모 병렬형 염기서열 분석 (massively parallel sequencing)에 적용할 샷건 라이브러리 (shotgun library)를 성공적으로 제작하기 위해 두 가지 유형의 고대 DNA (ancient DNA, aDNA) 분리 방법을 비교하였다. 헝가리 선사 시대 늑골 뼈 시료로 실리카 현탁액을 이용한 추출법과 Amicon Ultracel-15 10K 초원심 분리 장치(Millipore)를 이용한 추출법을 비교하였다. 약 150 mg의 뼛가루에서 각각의 방법으로 3 회 반복 추출한 후 이중 가닥 DNA (double stranded DNA, ds DNA)의 양을 측정하였다. 초원심분리 농축 방법은 실리카 현탁액을 사용하는 것보다 더 빠르고, 더 쉬운 공정이며 약 11 배 높은 DNA 회수율을 나타냈다. 또한 초원심 분리 장치로 획득한 DNA 주형은 실리카 현탁액으로 획득한 것보다 샷건 라이브러리가 훨씬 성공적으로 만들어졌다. 두 종류의 aDNA 추출 방법을 비교한 본 연구는 Amicon 장치를 사용하는 분리법이 시간의 절약, 단순한 프로세스 및 높은 효율 등의 장점을 지니고 있음을 보여주었다.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 1988년도 전기.전자공학 학술대회 논문집
• /
• pp.687-690
• /
• 1988

Algorithms that represent given pattern in the form of an ARG (Attributed relational graph) using not only structural relations but also symbolic or numerical attributes, and then recognize that pattern by graph matching process are presented in this paper. Based on definitions of pattern deformational models, algorithms that can find GPECI(Graph preserved error correcting isomorphism). SGECI(subgraph ECI) and DSECI(Double subgraph ECI) are proposed and comparisons among these algorithms are described. To be useful in performig practical tasks, efficient schemes for extraction of ARG representation fron raw image are needed. In this study, given patterns are restricted within objects having distinct skeleton, and then the information which is necessary for recognition and analysis is successfully extracted.

• Korean Chemical Engineering Research
• /
• 제49권5호
• /
• pp.617-622
• /
• 2011

심해상어 간유에서 추출한 천연유지는 스쿠알렌(Squalene)과 알콕시글리세롤(Alkoxyglycerol)을 함유하고 있다. 본 연구에서는 심해상어 간유에서 피부 보호능력이 있는 스쿠알렌과 면역작용이 우수한 알콕시글리세롤을 추출하고 GC-MS 분석을 통하여 정제과정을 거친 스쿠알렌과 알콕시글리세롤의 함량 변화를 비교하고 스쿠알란과 함께 물성을 평가하였다. 스쿠알렌의 함량은 정제과정을 거친 뒤에 35% 더 증가하였으며 알콕시글리세롤의 함량은 21.9% 더 증가한 것을 볼 수 있었다. 상어간유를 알콕시글리세롤 정제과정을 통해 지방산은 61%에서 4%로 57%의 지방산이 제거된 것을 확인할 수 있었고, 지방산 중 Palmitic acid와 Oleic acid의 함량이 크게 감소된 것을 확인할 수 있었다. 상어간유에 과산화물가와 산가는 스쿠알렌 정제과정을 거친 후 크게 낮아진 것을 확인하였고 불포화 지방산이 이중결합이 많은 스쿠알렌이 스쿠알란(Squalane)보다 요도드가가 월등히 큰 것을 확인하였다.

• Nutritional Sciences
• /
• 제9권4호
• /
• pp.317-322
• /
• 2006

Soybeans are well-known as allergenic foods. Koreans consume large amounts of soybean foods, such as kochujang, which have gone through the fermentation process. To lower the allergenicity of these foods, we prepared hypo allergenic kochujang with aloe extract (AK). A sensory evaluation was conducted along with a clinical evaluation that used a double-blind, placebo-controlled food challenge (DBPCFC) test These tests were designed to evaluate the acceptability of the fermented foods. In comparison to normal kochujang (NK), AK elicited a higher sensory test score, and the rate of positive reactions in atopic dermatitis patients during the DBPCFC test was reduced. Methods of protein extraction, protein quantitation with sodium dodecyl sulphate polyacrylamide gel electrophoresis (SDS-PAGE), and protein identification using two-dimensional (2D) gel electrophoresis were performed for both NK and AK to compare the functional factors. We found a reduction in the levels of high molecular proteins even though the bands of the proteins had not entirely disappeared, indicating that the boiling and fermentation process changed the soybean protein patterns. The rate of the reduction of high molecular proteins was more effective in the AK. In conclusion, AK can be recognized as a food with hypoallergenic effect.

• 대한지리학회지
• /
• 제39권4호
• /
• pp.633-642
• /
• 2004

본 연구의 목적은 규칙기반 모델링을 구성하여 하계망을 일반화하고자 하였다. 그 동안 지도 일반화에 대한 연구는 제한된 지도요소를 대상으로 선형사상의 형태변형을 위한 알고리즘 개발과 평가에 집중되었다. 규칙 기반 모델링은 지도제작 원리와 공간현상의 분포패턴을 분석하여, 그 결과를 일반화 과정에 적용하기 때문에 기존의 일반화 알고리즘 개선에 도움이 된다. 규칙기반 모델링은 다양한 지도요소들을 대상으로 일반화를 적용할 수 있고, 디지털 환경하에서 다축척 지도제작에 효과적이다. 본 연구에서 개발된 하계망 규칙기반 모델링은 일반화 규칙, 중심선 추출 그리고 선형사상 일반화 알고리즘으로 구성된다. 일반화를 적용하기 앞서, 하계망은 논리적 오류를 최소화하기 위해 저수지와의 연결관계를 분석하였다. 모델을 적용한 결과, 108개의 실폭 하천 중 17개 하천이 중심선으로 추출되었다. 하천의 총길이는 1:25,000에서 17%, 1:50,000에서는 29%로 감소하였다. 선형사상 일반화를 위해 개발된 Simoo 알고리즘은 Douglas-Peucker 알고리즘과 비교하였다. Doug]as-Peucker 알고리즘은 자료점 간격과 편각이 커지게 되어 선의 형태가 거칠어지는 반면, Simoo 알고리즘에서 선형사상은 축척이 감소함에 따라 보다 완만해진다.