• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2015년도 추계학술대회
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• pp.759-762
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• 2015

스마트 기기들이 대중화되면서 스마트 폰이나 태블릿 등은 현대사회에 필수품이 되었다. 이러한 시대적인 흐름에 따라서 개인이 보유한 스마트 기기를 생활에 활용하는 Bring Your Own Device 환경이 주목받고 있다. 따라서 본 논문에서는 BYOD 환경에 초점을 둔 WiFi 원격주문 시스템을 설계하였다. BYOD 환경에서의 WiFi 원격주문 시스템이 보급된다면 효율성 증대와 고객 편익 증대 등의 긍정적인 효과를 기대할 수 있다. 대표적으로 스마트 기기를 통한 실시간 고객요청은 빠른 서비스 제공이 가능해진다. 소비자들이 원격주문을 위한 모바일 앱 설계와 가맹점에서 주문내역과 메뉴관리, 매출 통계자료를 조회하고 등록할 수 있는 웹페이지를 설계하였다. 본 논문에서 설계한 WiFi 원격주문 시스템이 국제적으로 널리 보급된다면 많은 사람들에게 유용하게 사용될 것으로 기대한다.

• Perspectives in Nursing Science
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• 제12권2호
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• pp.115-123
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• 2015

Purpose: This study aimed to investigate the quality of patient-centered nursing care (PCNC) among women with breast cancer at a cancer center in Seoul, Korea. Methods: In a cross-sectional survey design, 223 women with breast cancer were recruited from the oncology surgery unit. The Korean version of the oncology patients' perceptions of the quality of nursing care scale, which is conceptualized in four sub-dimensions (individualization, proficiency, responsiveness, and coordination) was used for measurement. Data were analyzed using descriptive statistics and ANOVA. Results: The participants were all women, with a mean age of 51.3 years. The mean score of PCNC was high and significantly different from each other according to age group. Breast cancer women, who had mastectomy, were satisfied highly in terms of proficiency and responsiveness care, but less satisfied with individualization and coordination care than those of other women. Conclusion: The findings of this study show the quality of cancer nursing care, especially focusing on patient-centeredness, can be measured from the patients'perspective. The individualized and coordinated nursing care is considered to be the core of quality cancer care implying patient-centeredness. Based on the findings of this study, more research is necessary to explore the patients' view of quality cancer care and to test the effects of PCNC within the context of comparative effectiveness.

• 대한조선학회논문집
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• 제50권1호
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• pp.41-48
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• 2013

Several fatigue damages have recently been reported which cannot be resolved in the context of the existing fatigue design procedure, and they are suspected to be the cracks induced by the low cycle fatigue mechanism. To tackle the problem, a series of material tests together with fatigue tests have been carried out, and elasto-plastic notch strain analysis using nonlinear kinematic hardening model has been performed. The cyclic stress-strain curves are obtained and the nonlinear kinematic hardening model was calibrated based on the obtained material data. Also, the fatigue test with non-load-carrying cruciform fillet welded joint has been performed in low cycle fatigue regime. Then, the notch strain analyses have been carried out to find the precise elasto-plastic behavior of the material at the notch root of the cruciform joint. The variation of the material property from the base metal via HAZ up to the weld metal was taken into account using spatial variation of the material property. Then the detail elasto-plastic behavior of the welded joint subjected to the repeated cyclic loading has been investigated further through the comparison with the prediction with Neuber's rule. The calibration of the nonlinear kinematic hardening model and nonlinear notch strain analyses have been performed using the commercial FE program ABAQUS.

• 한국항공우주학회지
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• 제48권1호
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• pp.13-21
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• 2020

유도무기의 설계 및 제어에서 6자유도 공력계수의 신속한 추정을 위해 공력계수 데이터에 기반한 예측 모형이 주로 이용된다. 고정확도의 공력계수 예측 모형은 다수의 풍동시험 데이터로 생성할 수 있지만, 이는 많은 시간과 자원을 요구한다. 따라서 본 연구에서는 소수의 풍동시험 데이터를 다수의 전산유체역학 데이터와 혼합한 코크리깅 기법을 활용해 고정확도의 공력계수를 신속하고 효율적으로 예측하고자 한다. 풍동시험과 전산유체역학 데이터를 혼용한 예측 모형의 우수성을 보기 위해, 전산유체역학 데이터 보조의 유무에 따라 두 가지 공력계수 예측 모형을 생성한 후 수치적 검증과 예측 경향성 점검으로 두 모형의 예측 정확도를 비교하였다. 그 결과, 전산유체역학 데이터의 도움 덕분에 코크리깅 모형으로 크리깅 모형보다 더 정확한 공력계수 산출이 가능한 것을 확인하였다.

• 기술혁신학회지
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• 제11권2호
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• pp.194-218
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• 2008

본 연구는 다양하고 동태적인 과학기술 환경에 부합할 수 있는 과학기술혁신 민-관 협력 메카니즘의 구성요소를 협력사업의 추진목적, 추진주체, 대상사업측면에서 파악하여 과학기술혁신을 위한 민관협력 활성화를 위한 정책적 시사점을 얻고자 하는데 그 목적이 있다. 네덜란드, 호주, 오스트리아 및 프랑스 6개 프로그램에서 나타나는 민-관 협력 메카니즘의 구성요소와 민-관간 역할분담관계를 살펴보고 과학기술혁신부문 민-관 협력 메카니즘의 유형과 특성을 분석하였다. 비교연구를 통하여 나타난 6개 프로그램의 공통점은 민-관 협력 메카니즘이 국가기술혁신체제 내 혁신주체 간 연계성을 강화시키는 작동기제로 운영되고 있으며 참여주체간의 지속적인 상호작용적 관계(interactive relationship)를 유지하며 참여주체간 목표(common objectives)를 공유하는 수준이 높고 경제적 측면보다 과학기술활동 주체들 간의 연계 및 네트워크 구축의 외부성(externality)을 중시하고 있음을 확인하였다. 특히 연구개발자금의 최적 배분 및 재원조달방식을 통하여 과학기술혁신 주체간 위험과 편익의 공유를 통해 새로운 협력연구수행 인센티브를 균형적으로 조정하고 있으며, 민관 R&D간 상호보충성 제고를 통한 시너지 효과를 모색하고 있음을 확인할 수 있었다.

• 정보처리학회논문지A
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• 제8A권4호
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• pp.311-318
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• 2001

최근 인터넷의 확산으로 인하여 멀티미디어 서비스에 대한 사용자의 요구가 증가되고 있다. 그러나 서버 시스템들은 이러한 사용자들에게 멀티미디어 데이터를 효과적으로 공급하지 못하고 있다. 멀티미디어 응용 프로그램들은 같은 데이터를 여러 장치들 사이에서 경로를 유지하기 때문에 부하가 발생하고, 효과적인 I/O(Input/Output) 서브시스템이 요구되어지고 있다. 멀티미디어 데이터를 효과적으로 공급하지 못하는 비효율적인 I/O의 원인으로 잦은 데이터 복사와 문맥교환이라고 인식되어 왔다. 따라서 본 논문에서는 리눅스 시스템에 새로운 Multimedia Stream System Call (MSSC) 메커니즘을 제안한다: RTP(Real-time Transport Protocol) 프로토콜과 함께 이 메커니즘은 커널 영역에서 수행하도록 하는 것이다. 이 MSSC 메커니즘을 사용한 결과 일반적인 리눅스 시스템보다 12.5%∼14%의 성능이 향상됨을 보여준다.

• 한국정보과학회논문지:소프트웨어및응용
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• 제32권9호
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• pp.888-900
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• 2005

행동 또는 계획이 인식적으로 실행 가능한지에 대한 지식 전제조건 문제는 그 동안 여러 연구들을 통해 정형화되어 왔다. 하지만 지금까지의 연구에서는 이러한 행동 및 계획이 실행 가능한지를 만드는 시점에서만 검사하며, 실제 수행될 때도 실행 가능할 것이라는 것을 가정하기 때문에, 시맨틱 웹에서 여러 에이전트들이 웹서비스 조합을 실행하기 위해 제한된 자원들을 공유해야 하는 분산 환경에서는 제대로 동작하지 않게 된다. 따라서 본 연구에서는 웹서비스 조합의 원자성을 보장할 수 있도록 트랜잭션적으로 수행 가능한 웹서비스 조합을 정의하고 이를 정형화한다. 이를 위해서 TL-ALCF에서 K와 A 모달 연산자를 추가하여 확장한 $TL-ALCFK_{NF}$를 제안함으로써 웹서비스 조합을 표현할 수 있는 언어인 TL-ALCF에서 인식 추론이 어떻게 수행될 수 있는지를 보인다.

• 유통과학연구
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• 제14권4호
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• pp.127-134
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• 2016

Purpose - Value chain in agriculture refers to direct and indirect activities related to value-added process from raw materials to final products in agricultural industries. In recent years, value chain analysis has become more important in the area of agricultural development. This article reviews the concept and importance of value chain analysis in the context of agricultural development and attempts to suggest improvement strategies. Research design, data, methodology - A literature survey was conducted for value chain analysis for agricultural development. The case of agro-value chain in Cambodia was deeply analyzed based upon interviews with government officers and related experts. Results - It seems that agro-value chain in developing countries are not well developed and does not carry out appropriate functions, compared to developed countries. Because value adding facilities, such as storage, processing and packing plants, milling plants, and etc. are not sufficiently constructed, the quality of agricultural products is low. Especially developing countries may loose opportunities to increase value of their product by exporting their agricultural products as raw materials to neighboring countries. Value adding process is also mainly controlled by traders in local markets or wholesale markets in urban areas. Farmers therefore can get lower share of final value of agricultural products compared to the shares paid to traders. Lastly it is argued that governments of developing countries do not play an active role in developing value chains and do not carry out coordinating functions in an effective and efficient manner. Conclusions - The first step to improve agro-value chain in developing countries is to identify and analyze value chain structure of agricultural products and to make development strategies and implementation programs. For improving value chain of agricultural products in developing countries, it is required to provide not only plans for constructing hardwares, such as wholesale markets, storage facilities, processing and packing plants, and etc., but also plans for improving softwares, such as measures for improving product quality and safety, setting up grade and standard, providing market information, and nurturing producer cooperatives.

• Smart Structures and Systems
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• 제13권2호
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• pp.257-280
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• 2014

In this paper, a novel PARAllel FACtor (PARAFAC) decomposition based Blind Source Separation (BSS) algorithm is proposed for modal identification of structures equipped with tuned mass dampers. Tuned mass dampers (TMDs) are extremely effective vibration absorbers in tall flexible structures, but prone to get de-tuned due to accidental changes in structural properties, alteration in operating conditions, and incorrect design forecasts. Presence of closely spaced modes in structures coupled with TMDs renders output-only modal identification difficult. Over the last decade, second-order BSS algorithms have shown significant promise in the area of ambient modal identification. These methods employ joint diagonalization of covariance matrices of measurements to estimate the mixing matrix (mode shape coefficients) and sources (modal responses). Recently, PARAFAC BSS model has evolved as a powerful multi-linear algebra tool for decomposing an $n^{th}$ order tensor into a number of rank-1 tensors. This method is utilized in the context of modal identification in the present study. Covariance matrices of measurements at several lags are used to form a $3^{rd}$ order tensor and then PARAFAC decomposition is employed to obtain the desired number of components, comprising of modal responses and the mixing matrix. The strong uniqueness properties of PARAFAC models enable direct source separation with fine spectral resolution even in cases where the number of sensor observations is less compared to the number of target modes, i.e., the underdetermined case. This capability is exploited to separate closely spaced modes of the TMDs using partial measurements, and subsequently to estimate modal parameters. The proposed method is validated using extensive numerical studies comprising of multi-degree-of-freedom simulation models equipped with TMDs, as well as with an experimental set-up.

• 아태비즈니스연구
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• 제12권1호
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• pp.209-223
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• 2021

Purpose - The purpose of this study was to investigate the relationship between Korea agricultural productions and Greenhouse Gas (GHG) emissions based on Environmental Kuznets Curve (EKC) hypothesis. Design/methodology/approach - This study utilized time series data of economic growth, greenhouse gas, agricultural productions, trade dependency, and energy usages. In order to econometric procedure of EKC hypothesis, this study utilized unit root test and cointegration test to check staionarity of each variable and also adopted Vector Error Correction Model (VECM) and Ordinary Least Square (OLS) to analyze the short and long run relationships. Findings - In the short run, greenhouse gas emissions resulting from economic growth show an inverse U-shape relationship, and an increase in agricultural production and energy consumption led to increase in greenhouse gas emission. In the long run, total GHG emissions and CO2 emissions show an N-shaped relationship with economic growth, and an increase in agricultural production has resulted in a decrease in total GHG and CO2 emissions. However, methane (CH4) and nitrous oxide (N2O) emissions showed an inverse U-shape relationship with economic growth, which indicated the environment and production process of agricultural production. Research implications or Originality - Korea agricultural production has different effects on the GHG emission sources, and in particular, methane (CH4) and nitrous oxide (N2O) emissions show to increase as the agricultural production expansions, so policy or technological development in related sector is required. Especially, in the context of the 2030 GHG reduction road-map, if GHG-related reduction technologies or policies are spread, national GHG emission reduction targets can be achieved and this is possible to predict the decline in production in the sector and damage to the related industries.