• 한국초전도ㆍ저온공학회논문지
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• 제8권4호
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• pp.1-7
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• 2006

This paper reviews AC loss characteristics of high $T_c$ superconductors. The mechanisms of AC loss generation are explained briefly, and AC losses are classified by the magnetic field components which generate them. A couple of analytical formulae of AC losses, which are useful for simple and rough AC loss estimations, are presented. AC loss characteristics of single BSCCO multifilamentary conductors and single YBCO coated conductors are reviewed based on previous experimental and numerical studies. AC loss characteristics of those two types of practical high $T_c$ superconductors are compared with each other.

• 한국가축번식학회지
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• 제16권4호
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• pp.289-299
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• 1993

돼지 난포내의 각 구성분들에 대해 10% SDS-PAGE와 IEF를 이용한 이차원 전기영동을 실시하여 세포 및 난포액 구성분의 구조단백질상을 분석하였다. 난자-난구세포 복합체를 호르몬과 15%의 FCS가 포함된 M16 배양액으로 39$^{\circ}C$, 5% CO2 상태에서 35시간 동안 체외배양하였다. 배양 전후의 난자, 투명대 및 난구세포와 난포 크기별로 회수된 난포액들을 각각 분리 회수하여 구조단백질상을 분석하였으며, Silver 염색과 CBB 염색으로 분석이 가능한 각 구성분의 적정 시료량을 조사하였다. 한편 난포 구성분들에 있어서 난자는 분자량이 25와 114kd, 난구세포는 20, 33, 58, 78 및 112kd, 투명대는 65kd, 그리고 난포액은 18, 76, 92, 152 및 187kd 단백질을 세포특이단백질로 가지고 있음이 확인되었다. 특히 난자의 경우 성숙에 따라 구조단백질상의 변화가 확인된 반면, 난구세포에서는 차이가 없었다. 또한 난포액은 난포의 크기에 따라서는 단백질상의 차이가 없었으나 호르몬 처리 여부에 따라서는 이차원 전기영동상에서 몇가지 단백질에서 차이가 확인되었고, 난포세포들도 폐쇄 여부에 따라 단백질 조성에 차이를 보였다. 따라서 본 실험에서는 전기영동에 필요한 시료의 양과 준비 방법을 확립하여 각 난포 구성분들의 단백질상 분석에 대한 기초자료를 확립하였으며, 이상의 결과는 앞으로 진행될 단백질의 생합성 분석이나 면역화학학적 분석에 유용하게 이용될 수 있을 것이다.

• Korean Chemical Engineering Research
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• 제52권4호
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• pp.481-485
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• 2014

잘피의 유용성분을 추출하기 위한 dipping, ultrasonic-assisted, heating추출법의 적용성을 검토하였다. 이온성 액체와 공융용매(DES)를 잘피에 존재하는 카페인산과 로즈마린산의 추출 효율을 증가시키기 위해 첨가제로써 사용하였다. 실험에서 확인된 최적의 조건은 동결건조된 0.005 g의 잘피 뿌리 파우더와 5 mL의 methanol 그리고 0.5 g의 DES-3를 바이알에 넣은 후 30분동안 dipping하여 추출하였다. 그 결과 0.19 mg/g 카페인산과 8.48 mg/g의 로즈마린산을 얻었다. 이 방법은 잘피에 있는 카페인산과 로즈마린산을 간단하고 성공적으로 적용할 수 있었고 전통적인 용매 추출법보다 청정용매인 DES를 첨가했을 때 잘피의 유용성분 추출에 더 적합함을 의미한다.

• 성인간호학회지
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• 제12권4호
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• pp.507-516
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• 2000

This study examines that North American Nursing Diagnosis Association(NANDA) and Home Health Care Classification(HHCC) is appropriate to classify home health care client's nursing problems and suggests a modified nursing diagnosis classification system. Two hundred and forty-nine clients' records at a general hospital were reviewed and nursing problems were diagnosed according to each classification system. Results of this study are as follows. The major client's medical diagnosis are pregnancy, childbirth and puerperium, malignant neoplasm, and benign neoplasm. Of four hundred and sixty-three nursing problems, all nursing problems made a diagnos according to HHCC, while three hundred and eighty-five made a diagnosis according to NANDA. The HHCC diagnosis included 78 more nursing problems than NANDA. The discrepancy in the results may indicate a significant advantage to HHCC diagnosis because HHCC nomenclature was created empirically from hard data. However, this may be due to limitations in the data collection method so determination of which classification system is more useful is difficult to judge. However, nursing components of the HHCC are more concrete and clearer than human response patterns of the NANDA. Also the HHCC facilitates the documentation of patient care by computer, while using a conceptual framework consisting of 20 Care Components based on the nursing process: assessment, diagnosis, outcome identification, planning, implementation and evaluation. Accordingly, the practical application of HHCC is more useful than NANDA. Limitations of this study include a retrospective data collecting method and universality of samples. Further research for various samples that use prospective data collection method is recommended.

• 펄프종이기술
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• 제47권2호
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• pp.1-8
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• 2015

Disposable diaper has been used in order to handle urine and feces conveniently. At present the amount of disposable diaper waste increases gradually. Incineration and landfill have been the only ways to dispose of disposable diapers. However, if they are disposed by landfill, decomposition will take more than one hundred years. In addition, another way of dispose incineration has caused air pollution. Therefore, it is necessary to study recycling process for disposable diaper since plastic and wood fibers of diaper are useful materials to recycle. In this study, pulping condition of disposable diaper waste was studied in order to effectively separate the components. Recovery rates of plastic and fibers were analyzed under different pulping conditions. It was found that optimum pulping consistency was 5%, time was 60 minutes, temperature was $50^{\circ}C$, and cut size is $21cm{\times}21cm$. The recovery rate of plastic and fibers can be achieved above 70% under the optimum pulping condition.

• 한국전자거래학회지
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• 제12권2호
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• pp.111-132
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• 2007

웹 기능의 향상과 웹 관련 기술의 발전, 레거시 시스템과의 통합 필요성 증대, 자주 변하는 웹 콘텐츠와 구조 등으로 인하여 웹 애플리케이션을 개발하고 관리하는 일이 과거보다 훨씬 더 복잡하게 되었다. 그러나 이러한 다양한 요인들을 고려하는 포괄적인 웹 애플리케이션 설계 방법론은 아직 존재하지 않고 있다. 따라서 본 연구에서는 이러한 요인들을 고려한 컨텍스트 기반의 웹 애플리케이션 설계 방법론을 제시하고자 한다. 본 연구에서 제시하는 방법론에서는 웹 정보를 전달하는 메커니즘에 따라 구분되는 9 종류의 웹 페이지 형태와 웹 페이지 간의 다양한 의미 관계를 정의하는 7 종류의 링크 형태 및 설계 과정 중에 사용되는 여러 종류의 컴포넌트 역할을 구별하는 소프트웨어 컴포넌트 형태 등 다양한 종류의 모델링 기법들을 소개하고 있다. 뿐만 아니라 이 방법론은 '콤펜디엄(compendium)' 이라 불리는 일단의 관련된 정보 클러스터들로 이루어진 독창적인 웹 애플리케이션 모델을 사용하고 있다. 하나의 콤펜디엄은 주제(theme), 컨텍스트 페이지, 링크 및 컴포넌트로 구성된다. 이러한 접근 방법은 모듈 방식의 설계에 유용할 뿐만 아니라 항상 변하는 웹 애플리케이션의 콘텐츠와 구조를 관리하는데도 도움이 된다. 본 연구에서 제시한 방법론은 의미적으로 응집력이 있고 구문적으로 느슨히 결합된 유연한 웹 디자인 산출물을 생성하는데 도움이 될 것이다.

• Journal of Ginseng Research
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• 제32권1호
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• pp.62-66
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• 2008

Non-saponin gingseng fraction components (NSRG) have been known to have a variety of biological activity. However, the effects of these components on the function of brain cell have not been characterized in detail. In this study, we investigated the preventive effect of non-saponin red ginseng components on acrylamide (ACR)-induced suppression of neural cell adhesion molecule (NCAM), which is highly expressed in neuronal cells. The data showed that NSRG blocked the suppression of NCAM expression by ACR in neuroblastoma cells (SK-N-SH). In addition, NSRG significantly increased NCAM expression in ACR-nontreated neuroblastoma cells. NSRG treatment resulted in the increase of cell proliferation in a concentration-dependent manner. We also examined whether NSRG could modulate the NO production of astrocytes. When glioma cells (C6) were treated with various concentrations of NSRG (100-300 ug/ml) in the presence or absence of $IFN-{\gamma}$ for 24 hours, NO production was suppressed in $IFN-{\gamma}-$stimulated C6 cells. Taken together, these results demonstrate that treatment of brain cells with NSRG results in the enhancement of proliferation, the suppression of NO production and the protective effect on NCAM expression impaired by ACR. Thus, the present data suggest that NSRG has proliferative and neuroprotective effects and these effects could be useful in neuronal diseases.

• 한국멀티미디어학회논문지
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• 제15권3호
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• pp.408-416
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• 2012

최근에 문화콘텐츠에 대한 관심이 높아지면서 문화적 가치가 높은 고건축에 대한 3차원 복원이 활발하게 이루어지고 있으며 최근에는 새로운 IT기술과 장비를 활용하여 디지털 복원작업이 이루어지고 있다. 3D 스캐너를 이용한 3차원 복원방식은 외관에 관한 매우 정교한 데이터를 확보할 수 있지만 대용량의 데이터를 처리해야 하고 목가구에 대한 세부 정보의 부재로 인해 디지털 콘텐츠로 활용하는데 제약이 따른다. 우리나라의 전통 목조건축은 특성상 연결부재의 사용과 이들간의 결구방식이나 축조방법은 그 시대의 건축문화를 알아보는 중요한 자료이다. 따라서 본 연구에서는 목가구 방식에 의한 설계 도구를 개발하여 3차원 디지털복원은 물론, 기존의 방법에서 간과되었던 결구방식이나 축조방법에 대한 유용한 정보를 실시간으로 한 눈에 보여줄 수 있는 콘텐츠를 제작할 수 있는 새로운 방식의 3D 복원방법을 제안한다.

• 산업경영시스템학회지
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• 제42권4호
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• pp.194-202
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• 2019

Reliability analysis of the components frequently starts with the data that manufacturer provides. If enough failure data are collected from the field operations, the reliability should be recomputed and updated on the basis of the field failure data. However, when the failure time record for a component contains only a few observations, all statistical methodologies are limited. In this case, where the failure records for multiple number of identical components are available, a valid alternative is combining all the data from each component into one data set with enough sample size and utilizing the useful information in the censored data. The ROK Navy has been operating multiple Patrol Killer Guided missiles (PKGs) for several years. The Korea Multi-Function Control Console (KMFCC) is one of key components in PKG combat system. The maintenance record for the KMFCC contains less than ten failure observations and a censored datum. This paper proposes a Bayesian approach with a Dirichlet mixture model to estimate failure time density for KMFCC. Trends test for each component record indicated that null hypothesis, that failure occurrence is renewal process, is not rejected. Since the KMFCCs have been functioning under different operating environment, the failure time distribution may be a composition of a number of unknown distributions, i.e. a mixture distribution, rather than a single distribution. The Dirichlet mixture model was coded as probabilistic programming in Python using PyMC3. Then Markov Chain Monte Carlo (MCMC) sampling technique employed in PyMC3 probabilistically estimated the parameters' posterior distribution through the Dirichlet mixture model. The simulation results revealed that the mixture models provide superior fits to the combined data set over single models.

• 한국재료학회지
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• 제26권11호
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• pp.611-622
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• 2016

Particle morphology change and different experimental condition analysis during composite fabrication process by traditional ball milling with discrete element method (DEM) simulation were investigated. A simulation of the three dimensional motion of balls in a traditional ball mill for research on the grinding mechanism was carried out by DEM simulation. We studied the motion of the balls, the ball behavior energy and velocity; the forces acting on the balls were calculated using traditional ball milling as simulated by DEM. The effect of the operational variables such as the rotational speed, ball material and size on the flow velocity, collision force and total impact energy were analyzed. The results showed that increased rotation speed with interaction impact energy between balls and balls, balls and pots and walls and balls. The rotation speed increases with an increase of the impact energy. Experiments were conducted to quantify the grinding performance under the same conditions. Furthermore, the results showed that ball motion affects the particle morphology, which changed from irregular type to plate type with increasing rotation speed. The evolution was also found to depend on the impact energy increase of the grinding media. These findings are useful to understand and optimize the particle motion and grinding behavior of traditional ball mills.