• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2001년도 봄 학술발표회 논문집
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• pp.347-354
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• 2001

In this study, 3-D FEM analysis are carried out to investigate the effect of the corners and re-entrant corners which can't be analysed by 2-D analysis. The excavation shape is re-entrant type conditions. The wall displacement, earth pressure and effectiveness of the corner struts are investigated in the re-entrant case, The 3D analysis are peformed to evaluate the effect of various factors, such as re-entrant corner size, excavation depth, and presence of struts. The wall displacement and earth pressures are influenced the size of re-entrant corner. Therefore, the effect of re-entrant corner should be considered in the evaluation of the earth pressure and displacement of the corners. Finally, strut-support systems are not effective at the re-entrant corner.

• 한국멀티미디어학회논문지
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• 제23권8호
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• pp.891-902
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• 2020

The Re-Identification(Re-ID) is one of the most popular researches in the field of computer vision due to a variety of applications. To achieve a high-level re-identification performance, recently other methods have developed the deep learning based networks that are specialized for only person or vehicle. However, most of the current methods are difficult to be used in real-world applications that require re-identification of both person and vehicle at the same time. To overcome this limitation, this paper proposes a deep neural network learning method that combines triplet and softmax loss to improve performance and re-identify people and vehicles simultaneously. It's possible to learn the detailed difference between the identities(IDs) by combining the softmax loss with the triplet loss. In addition, weights are devised to avoid bias in one-side loss when combining. We used Market-1501 and DukeMTMC-reID datasets, which are frequently used to evaluate person re-identification experiments. Moreover, the vehicle re-identification experiment was evaluated by using VeRi-776 and VehicleID datasets. Since the proposed method does not designed for a neural network specialized for a specific object, it can re-identify simultaneously both person and vehicle. To demonstrate this, an experiment was performed by using a person and vehicle re-identification dataset together.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제9권7호
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• pp.2703-2718
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• 2015

Nowadays, public cloud storage is gaining popularity and a growing number of users are beginning to use the public cloud storage for online data storing and sharing. However, how the encrypted data stored in public clouds can be effectively shared becomes a new challenge. Proxy re-encryption is a public-key primitive that can delegate the decryption right from one user to another. In a proxy re-encryption system, a semi-trusted proxy authorized by a data owner is allowed to transform an encrypted data under the data owner's public key into a re-encrypted data under an authorized recipient's public key without seeing the underlying plaintext. Hence, the paradigm of proxy re-encryption provides a promising solution to effectively share encrypted data. In this paper, we propose a new certificate-based proxy re-encryption scheme for encrypted data sharing in public clouds. In the random oracle model, we formally prove that the proposed scheme achieves chosen-ciphertext security. The simulation results show that it is more efficient than the previous certificate-based proxy re-encryption schemes.

• Journal of Microbiology and Biotechnology
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• 제16권10호
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• pp.1491-1498
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• 2006

The feasibility of pullulan acetate nanoparticles (PAN) with ionic strength (IS) sensitivity as a radioisotope carrier to inhibit tumor growth is demonstrated. PAN was radiolabeled with rhenium 188 (Re-188) without any chelating agents. The labeling efficiency of Re-188 into PAN (Re-188PAN) was $49.3{\pm}4.0%$ as determined by TLC. The tumor volumes of mice treated with 0.45 mCi of Re-188-PAN were measured and compared with that of free Re-188 after 5 days of intratumoral injection. For the histological evaluation of apoptotic nuclei of tumor cells, hematoxylin and eosin (H&E), and terminal deoxynucleotidyl transferase biotinylated deoxyuridine triphosphate nick end labeling (TUNEL) staining were performed. The mean tumor volume of the Re-188-PAN-treated group was decreased by 36% after 5 days, whereas that the free Re-188-treated group was decreased by only 15% (P<0.05). The mean number of TUNEL-positive cells in Re-188-PAN-treated tumors at $144.3{\pm}79.9$ cells/section was significantly greater than the control ($26.7{\pm}7.9$ cells/section, P=0.03). The numbers of leukocyte and lymphocyte were decreased in both free Re-188- and Re-188-PAN-treated mice. These results indicated that the intratumoral injection of Re-188-PAN effectively inhibits the tumor growth by prolonging Re-188 retention time in tumor site induced by the IS sensitivity.

• 공업화학
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• 제33권2호
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• pp.195-201
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• 2022

본 연구에서는 지황 추출물[Rehmannia glutinosa extract (RE)]이 함유된 chitosan (CH) 기반 바이오 소재를 제조하고, 물리·화학적 특성, RE 방출 특성, 멜라닌 합성 억제 효과, 항산화 효과, elastase 억제 효과를 조사하였다. RE 함유 CH기반 바이오 소재는 casting method와 UV 경화 공정을 통해 제조되었다. 제조된 바이오 소재의 표면 특성은 FE-SEM으로 분석하였고, 물리적 특성은 인장강도, 신축률을 통하여 조사하였다. 경피 약물 전달 시스템을 적용하기 위해 36.5 ℃에서 pH 4.5, pH 5.5, pH 6.5 용액에서와 인공피부를 이용해 제조된 바이오 소재에서 RE의 방출 특성을 조사하였으며, 그 결과, pH 6.5에서 가소제를 첨가하지 않은 바이오 소재와 가소제[glycerol (GL)와 citric acid (CA)]를 첨가하여 제조한 RE 함유 바이오 소재에서 RE의 방출이 pH 4.5에서 보다 약 1.10배 빠르게 일어남을 알 수 있었다. 또한, 인공 피부에서 RE의 방출은 약 6 h 동안 지속적으로 방출됨을 확인하였다. Tyrosinase assay, 2,2-diphenyl-1-picrylhydrazyl(DPPH) assay, elastase assay를 통해 기능성을 평가하였으며, 가소제로 CA를 첨가하고 RE가 함유된 바이오 소재에서 각각 45.12%의 tyrosinase 활성율, 89.40%의 DPPH 라디칼 소거능, 59.94%의 elastase 활성율을 나타내었다.

• 한국위성정보통신학회논문지
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• 제8권4호
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• pp.142-149
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• 2013

인공위성을 포함한 우주물체가 지구궤도로 재진입하고 대기권에서 소실되거나, 지표면에 추락하는 일들이 날로 증가하고 있다. 최근 국내에서도 위성추락상황실을 운영하여 인공위성의 추락고도 및 추락시기에 대한 예측을 실시하였다. 아직까지 국내에서는 우주물체의 추락 시 현업에 적용할 수 있는, 미전략사령부에서 발표하는 TLE 자료를 활용한 독자적인 추락예측모델이 없으며, 다른 위성 운영국에서 발표하는 추락 예상시기를 참고하였다. 이 연구에서는 TLE 자료에 대기모델을 바탕으로 추락예상시기를 예측하고, 분석한 결과를 종합 분석하였고, 위성추락상황실 운영간 적용했던 RUBBER SHEET SHIFT METHOD(RSSM)의 인공위성 예상추락시기 예측결과를 토대로 새로운 추락모델에 대한 예시를 제안하였다.

• 한국기록관리학회지
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• 제21권4호
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• pp.101-115
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• 2021

기록물 공개의 전(前)단계인 공개재분류 업무는 가치있고 중요한 업무다. 그러나 그 의미와 중요성과 별개로 일선 기록연구사에게는 귀찮고 부담스러운 업무이기도 하다. 이에 기록연구사의 업무 부담을 경감해주는 공개재분류 자동화가 제안되기도 했다. 이런 상황에서 국가기록원의 '2020년 공개재분류 결과 건별 입력 위탁사업' 수행 간 공개재분류 솔루션을 활용하였고, 이를 사람이 한 작업과 비교⋅분석해 보았다. 물론 해당 사업은 공개재분류 솔루션에 대한 분석과 연구가 중심인 연구용역 사업이 아니었고, 상용프로그램을 실험적으로 사용해 본 제한적 결과라는 한계는 존재한다. 그럼에도 지능형 아카이브의 공개재분류에 대한 거시적이고 피상적인 논의만 있는 현 상황에서 기록연구사가 활용가능한 공개재분류 솔루션을 실제 사업에서 활용한 결과를 살펴보는 것은 여러모로 의미가 있으리라 생각된다. 본 논문은 공개재분류 솔루션의 활용 사례에 대한 분석을 통해 공개재분류 업무를 경감시킬 수 있는 실질적이고 미시적인 차원의 논의이다.

• Natural Product Sciences
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• 제10권3호
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• pp.134-139
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• 2004

In this study, an immunoactivity of panaxtriol ginsenosides Re and Rg1 against infection due to Candida albicans was investigated. The ginsenosides were extracted from Red Ginseng with 85% ethanol and heat-treatment and were analyzed by HPLC on water-acetonitrile as a mobile phase. The HPLC analysis revealed that the extract contained ginsenosides Re and Rg1, which were eluted as a combined peak. By agar diffusion susceptibility, the mixture of Re and Rg1 had no growth-inhibitory activity on C. albicans yeast cells. However, in animal tests BALB/c mice given the mixture of Re and Rg1 intraperitoneally (Lp.) before intravenous (Lv.) infection with live C. albicans yeast cells had longer mean survival times (MST) than MST of control mice groups that received only buffer solution instead of Re and Rg1. In experiments 60% of the ginsenosides-treated mice survived the entire duration of the 50-day observation. The Re and Rg1 mixture induced production of nitric oxide when interacted with RAW 264.7 macrophage cell line. In addition, the mixture caused morphological change of the macrophages. These data indicate that immunostimulation by the Re and Rg1 may be responsible for the protection of mice against disseminated candidiasis.

• 대한안전경영과학회지
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• 제17권4호
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• pp.321-333
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• 2015

This study empirically analyzed the influence of media on a visitor's satisfaction and re-visit by setting up 5 sorts of exhibition media as text, docent, virtual museum, website and Smartphone App based on practical exchange and communication between a visitor and an exhibition provider. The research results are as follows: First, all these 5 sorts of media suggested by this study were found to be able to have an influence on a visitor's satisfaction and re-visit. Second, it was found that the factors preferentially affecting a visitor's satisfaction and re-visit were 'Docent' and 'Website' factors. Accordingly, it is judged that it's necessary to more preferentially consider 'Docent' and 'Website' factors than the other factors in order to increase a visitor's satisfaction and re-visit. Third, it's possible to interpret that the bigger a visitor's satisfaction, the higher a visitor's intention to re-visit through the verification that a visitor's satisfaction will have a significant influence on a visitor's re-visit. The implication of this study lies in the fact that this study attempted at an integrated approach by analyzing the relative size of the influence through across-the-board suggestion of influential factors on a museum visitor's satisfaction and re-visit.

• 한국의상디자인학회지
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• 제15권1호
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• pp.191-206
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• 2013

Nowadays consumers have begun to have interest in eco-friendliness, and re-design is being highlighted as a fashion alternative for consumers with interest in ethical consumption. This study established the concept of re-design fashion as a way to practice eco-friendly design and analyzed various re-design fashions with four types. And it also analyzed decorative and structural details being often employed for re-design. This study intends to suggest new alternative fashion in order to develop re-design fashion design that can satisfy both eco-friendliness and practicality. The results of the research are as follows: First, according to the result of analyzing re-design fashion types, they can be divided into the types of developing new products through combination of decorative details, combination of structural details, development of new fabric through fabric reconstruction, and reconstruction to different products. Second, according to the result of examining the details that can be used to develop new re-design fashion products, pleats, shirring, tuck, peplum, or tab's decorative details and neck-line, collars, sleeves, cuffs, or pocket's structural details are utilized often. Third, total seven recycled clothes were used to design three works taking decorative and structural details. Through this, the study suggests re-design fashion products that can solve environmental pollution resulted from wastes of clothes.