• 지질공학
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• 제24권3호
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• pp.353-362
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• 2014

다공질 암석의 공극구조는 그 암석의 수리-역학적 거동에 매우 큰 영향을 미친다. 다공질 암석의 공극구조 특성을 표현하는 대표적인 방법은 공극률, 공극크기분포, 방향성 등이 있다. 암석의 유효공극률은 실험적으로 비교적 쉽게 구할 수 있지만, 공극의 크기분포 특성을 파악하는 것은 매우 어려운 실정이다. 본 연구에서는 X-ray CT를 이용하여 대표적 다공질 암석인 베레아 사암의 공극구조 중 공극크기분포를 이미지 기반으로 평가하였다. 공극크기분포 평가를 위해 본 연구에서는 이미지 필터링, 이진화, 골격화 등의 이미지 기반 처리 작업을 수행하였으며, 국부 두께평가 및 star chord를 이용하여 베레아 사암의 공극크기분포를 구하였다. 본 연구에서 제시된 X-ray CT 기반의 공극크기분포 평가방법을 이용하여 향후 다공질 재료의 공극구조 평가에 새롭고 효율적인 방안을 제시하고자 하였다.

• 공업화학
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• 제9권1호
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• pp.1-5
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• 1998

올리고머형 음이온성 계면활성제로서 소수성인 측쇄알킬기의 탄소수와 중합도가 다른 말레인산디에틸에스테르계(CmD-Na계) 또는 무수말레인산계(CmM-Na계)와 탄소수가 $C_4{\sim}C_{16}$인 알킬비닐에테르 공중합물을 분산제로 사용하여 분산이 잘 안되는 ${\alpha}-$나 ${\beta}-$형 copper phthalocyanine과 카본블랙의 미립자에 대하여 수용액중에서의 분산성을 비교검토 하였다. 그 결과 CmD-Na계의 측쇄알킬기의 탄소수가 $C_4{\sim}C_{10}$인 경우에는 0.01~0.1% 농도범위에서 우수한 분산효과를 나타내었고, 특히 측쇄알킬기가 안료입자 표면으로의 배향흡착에 중요한 역할을 하며, 중합도가 낮은 것이 효과적으로 나타났다. 그러나 카본블랙인 경우에는 이와 무관한 결과를 나타내었다.

• 지능정보연구
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• 제9권1호
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• pp.125-137
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• 2003

동양 문화권에서는 각종 계약과 서류 결재 등을 위하여 서명대신에 도장이 오랫동안 사용되어 왔으며 아직까지도 보편적인 인증 수단으로 사용되고 있다. 지문과 달리, 도장 영상은 유사한 패턴을 갖지 않고 도장이 찍히는 압력등 입력 상태에 따라서 선명도가 크게 달라진다. 본 연구에서는 입력 장치로부터 얻은 한글 또는 한자 도장 영상을 스트레칭, 이진화 및 잡음처리를 거쳐 판별하는 시스템을 개발하였다. 이 시스템을 가장 보편적으로 사용되는 원형모양의 50개의 도장 영상 (20개 한글 도장, 20개 한자 도장, 10개 유사 도장)에 대하여 실험한 결과, 46개의 도장 영상을 성공적으로 인식하여 비교적 높은 판별도 (92%)를 보였다. 한글과 한자 도장 사이의 차이는 거의 없었으며, 도장을 찍을 때의 각도 차이나 압력 차이가 판별도를 결정하는 중요한 요인으로 작용함을 알 수 있다. 인식할 수 있는 도장 영상의 모양을 원형뿐 아니라 타원과 사각형으로 확장하고 판별도를 좀더 향상하면, 현재 육안으로 확인하는 도장 영상 인식을 자동화하는데 실제로 유용하게 사용될 수 있을 것이다.

• 한국수산과학회지
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• 제27권6호
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• pp.754-770
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• 1994

미국 북캐롤라이나의 동해안에 위치하는 뉴우스강 하구를 대상으로 1988년 2월부터 1989년 2월까지 매월 부유퇴적물의 분포와 유속 및 염분을 조사하여, 최대혼탁수의 형성과 물리적 환경요인(담수유출량, 풍향 및 풍속, 조석 등)에 따른 시간적, 공간적 변화를 조사하였다. 대부분의 조사기간동안, 염하구 순환과 관련된 미약한 최대혼탁수의 형성이 염수 침입한계 근처에서 관측되었으며, 염수 침입한계의 연중 이동과 수반하여 강 상류의 약 20 km 지역에 걸쳐 이동하면서 분포하였다. 이 지역 계절풍의 주된 풍향(북동-남서)과 Pamlico Sound의 지형적 방향성의 일치로 인하여, 염분 성충구조와 염하구 순환의 발달정도는 바람의 영향을 크게 받으며, 따라서 최대혼탁수의 형성과 변동 양상도 조석의 영향보다는 담수유출량과 바람의 영향을 뚜렷이 나타내었다.

• 기술혁신학회지
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• 제8권spc1호
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• pp.360-390
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• 2005

The paradigm of the corporate innovations has been changed from the intra-company innovations to the inter-company innovations. A prevalent approach to the inter-company innovations is the supply chain management. Three key words of the core concept of supply chain management are the long-term relationship, resource integration, and value creation. Specifically, it means that the supply chain management aims to make value creation through the resource integration for the supply chain entities, based on the long-term relationship between buyers and sellers. To make more effective long-term relationship among the supply chain entities, it is very important for the supply chain entities to analyze followings: i) What variables can influence the long-term relationship, ii) How these variables can influence to the long-term relationship. However, previous researches mostly deals the long-term relationship in the marketing area in fragment, and thus few research efforts have been done for the development of conceptual model using supply chain management theories. In contrast to previous studies, our research tried to develop and examine the integrative research model by introducing both the marketing theories and the supply chain management theories, and thus related hypotheses are derived. A multiple regression analysis was performed to examine the influence of the antecedents of the long-term relationship, for the 87 retailers of grocery supply chains. The empirical results confirm that cultural similarity, reputation, interdependency, and trust positively influence long-term relationship (i.e., partnership orientation and partnership symmetry). And results also confirm that the supply implementation factors such as organization integration, information system integration, and process integration playa moderating role between antecedents and long-term relationship. These findings suggest that companies should perceive the importance of managing the process, organization, information system integration in the long-term relationship implementation process as well as the factors such as cultural similarity, reputation, interdependency, and trust in the long-term relationship establishment process.

• 대한물리치료과학회지
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• 제7권1호
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• pp.333-352
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• 2000

The objective of this study was to identify the effects of the cognitive performance of stroke patients on their motor function recovery after comprehensive rehabilitation management. The subjects of this study were 41 stroke in-patients of the Rehabilitation Hospital, College of Medicine, Yonsei University, hospitalized during the period from September 1, 1997 to May 5, 1998. The cognitive performance was measured using a Mini-Mental State Examination(MMSE) and the motor function recovery using Motor Assessment Scale(MAS). The data were analyzed by the paired t-test, independent t-test, a one way ANOVA, and Pearson's correlation coefficiency. The findings were as follows: 1. There was a significant difference found in the motor function recovery level after the comprehensive rehabilitation management. 2. There was no significant difference found in relation to sex, age, cause of stroke, laterality of paralysis and the level of spasticity. However, there was a big difference between pre- and post-treatment regarding the treatment period. 3. In line with the cognitive performance level, there was a significant difference found in the motor function recovery level after the comprehensive rehabilitation management. 4. The correlation between the elements of the cognitive performance and the motor recovery was found to be high in orientation, attention, calculation, and language. Those elements were expected to give larger effects on motor recovery after the comprehensive rehabilitation management. Based on this study, the cognitive performance level was found to play an important role in bringing effects on motor recovery after the comprehensive rehabilitation management of stroke patients. And the evaluation on the motor recovery based on quality would be also expected to be examined, as well as the cognitive performance level test accompanied by Intelligence Quality(IQ) test.

• 한국의료질향상학회지
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• 제19권2호
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• pp.80-88
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• 2013

Objectives: With the increase in the number of people who are marginalized in receiving medical services, the role of Seoul National University Hospital as a public hospital is being emphasized. However, many patients are either experiencing delays in receiving medical services or simply being left out as a result of the inaccessibility to the department of social work on part of both the patients and the medical staff. Methods: In order to increase consultation from other departments and the accessibility to the department of social work for the socially marginalized group through early consultation from other departments, the following steps were taken. First, an orientation program for novice medical residents led by clinical social worker was introduced/implemented. Second, posters and brochures on various financial aids programs were produced and distributed. Third, a system of early screening was built/constructed, and once a week rounds and early screening meeting were executed/carried out. Result: The department of social work's rate of consultation from other departments increased by 4.4% compared to last year, while it showed 61% increase for those wards that had an early screening meeting. In addition, the average time of consultation from other departments was reduced by 3.1 days, securing sufficient amount of time for clinical social work services, both in terms of quality and quantity. Conclusion: It is believed that the various promotional activities, along with the strengthening of accessibility to clinical social work services and early consultation on part of social disadvantaged/marginalized group, would undoubtedly help provide quality services to patients and increase their level of satisfaction. In this way, the wards can effectively reduce the number of unnecessary hospital stay days while the hospital can prevent the accumulation of outstanding bills/fees as well as contribute to the publicness of hospitals. The promotion of clinical social work programs in various ways are crucial to ensuring the satisfaction of patients and hospital staff.

• 한국재료학회:학술대회논문집
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• 한국재료학회 2011년도 춘계학술발표대회
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• pp.243.2-243.2
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• 2011

ZnO materials with a wide band gap of approximately 3.3 eV has been used in transparent conducting oxides (TCO) due to exhibitinga high optical transmission, but its low conductivity acts as role of a limitation for conducting applications. Recently, Ga or Al-doped ZnO (GZO, AZO) becomes transparent conducting materials because of high optical transmission and excellent conductivity. However, the fundamental mechanism underlying the improvement of electrical conductivity of the GZO is still the subject of debate. In this study, we have fully investigated the reasons of high conductivity through the characterization of plane defects, crystal orientation, doping contents, crystal structure in Zn1-xGaxO (x=0, 3, 5.1, 5.6, 6.6 wt%). We manufactured Zn1-xGaxO by sintering ZnO and Ga2O3 powers, having a theoretical density of 99.9% and homogeneous Ga-dopant distribution in ZnO grains. The GZO containing 5.6 wt% Ga represents the highest electrical conductivity of $7.5{\times}10^{-4}{\Omega}{\cdot}m$. In particular, many twins and superlattices were induced by doping Ga in ZnO, revealed by X-ray diffraction measurements and TEM (transmission electron microscopy) observations. Twins developed in conventional ZnO crystal are generally formed at (110) and (112) planes, but we have observed the twins at (113) plane only, which is the first report in ZnO material. Interestingly, the superlattice structure was not observed at the grains in which twins are developed and the opposite case was true. This structural change in the GZO resulted in the difference of electrical conductivity. Enhancement of the conductivity was closely related to the extent of Ga ordering in the GZO lattice. Maximum conductivity was obtained at the GZO with a superlattice structure formed ideal ordering of Ga atoms.

• 한국정보시스템학회지:정보시스템연구
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• 제22권4호
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• pp.23-48
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• 2013

This study shows that a sustainable competitive advantage and entrepreneurial characteristics are necessary for a software company to achieve competitive innovation and growth. This study investigates various software company characteristics and the effects of various company factors as its main research objectives. The data used in this research model were collected from software companies in South Korea. A total of 211 questionnaires were collected over a period of two months in 2013. EXCEL, AMOS, and SPSS were used to derive the study results. The hypothesis testing results of this study are as follows. First, a software company's entrepreneurial innovativeness and risk-taking behaviors have a positive influence on software innovativeness. A greater sense of innovativeness and entrepreneurial orientation leads to a higher propensity to take risks in software development. Second, the characteristics of software innovativeness, and flexibility have a significant influence on software company performance. Innovation during the initial periods of software usage can create a high demand for improvements and new features, requiring a flexible software design. Finally, this study analyzes the software features of entrepreneurial characteristics and the influence of institutional factors on the characteristics of individual innovativeness and software development. Entrepreneurial characteristics can affect governmental or institutional support, policies, and legal frameworks to promote the role of software innovativeness. The results of this study imply that software companies can adopt an entrepreneurial approach to promote technology development and product development for achieving a competitive advantage in the industry. This study also analyzes the environmental factors that affect the software industry and their implications for policy makers.

• 한국전자거래학회지
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• 제17권3호
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• pp.1-14
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• 2012

전자 정보 기술이 발전함에 따라, 스마트폰의 계산 능력은 더욱 막강해지고 저장장치의 용량은 더욱 거대해지고 있다. 이에 따라, 유용한 새로운 스마트폰 서비스가 많이 등장하고 있는데, 상황인지 서비스와 모바일 증강 현실이 근래에 가장 많이 연구되고 있는 대표적인 주제이다. 이러한 새로운 서비스에서 스마트폰에 장착된 카메라로 촬영한 사진 속의 개체를 인지하는 것은 매우 중요한 역할을 수행한다. 그래서 사진을 인지하는 연구가 많이 출판되었는데, 대부분은 처리 시간이 매우 긴 이미지 인지 기술 기반이다. 이와 반대로, 본 논문은 스마트폰의 센서로부터 수집한 데이터와 전자지도를 이용하여 사진 속의 개체를 인지하는 매우 빠르고 효율적인 방법을 제안한다. 제안하는 방법은 스마트폰이 제공하는 현재 위치와 방향각으로 카메라의 시선을 구하고, 카메라 시선과 교차하는 전자지도의 요소들을 찾는다. 그리고 교차하는 요소들을 조사하여 사진 속의 개체를 인지한다.