• 대한지리학회지
• /
• 제36권4호
• /
• pp.382-401
• /
• 2001

도시란 상호작용하는 여러 개의 하위 시스템들이 연계되어 있는 하나의 거대한 시스템이라고 보고 도시의 지속가능성을 측정.평가하기 위해 시스템-오리엔터의 분석들을 적용하여 표준화된 지표군을 추출하였다. 이렇게 설정된 지표들을 지역적 특성을 고려하여 적용할 수 있는 방안으로 규범적-분석적-실천적 차원으로 구분하여 구체적인 지침을 제시하였다. 실제로 한국의 성남시와 미국의 세인트폴시를 사례지역으로 선정하여 두 도시의 지속가능성을 측정.평가하였다. 지속가능성 수준을 측정하는 변수들에 대한 자료 가용성과 각 오리엔터를 평가하기 위한 최소요구치 와 만족도 목표수준에 대한 자료의 구축이 향후 과제이다

• 센서학회지
• /
• 제26권6호
• /
• pp.379-385
• /
• 2017

In this study, an amperometric non-enzymatic glucose sensor was developed on the surface of a glassy carbon electrode by simply drop-casting the synthesized homogeneous suspension of hexagonal boron nitride (h-BN) nanosheets with a copper metal-organic framework (Cu-MOF) composite. Comprehensive analytical methods, including field-emission scanning electron microscopy (FE-SEM), Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), cyclic voltammetry, electrochemical impedance spectroscopy, and amperometry, were used to investigate the surface and electrochemical characteristics of the h-BN-Cu-MOF composite. The FE-SEM, FT-IR, and XRD results showed that the h-BN-Cu-MOF composite was formed successfully and exhibited a good porous structure. The electrochemical results showed a sensor sensitivity of $18.1{\mu}A{\mu}M^{-1}cm^{-2}$ with a dynamic linearity range of $10-900{\mu}M$ glucose and a detection limit of $5.5{\mu}M$ glucose with a rapid turnaround time (less than 2 min). Additionally, the developed sensor exhibited satisfactory anti-interference ability against dopamine, ascorbic acid, uric acid, urea, and nitrate, and thus, can be applied to the design and development of non-enzymatic glucose sensors.

• 과학기술학연구
• /
• 제8권2호
• /
• pp.83-108
• /
• 2008

기술표준화에 영향을 미치는 제도적 요인으로서 국가개입 수준, 기업관계를 제시하고 이를 통합하여 국가마다 상이한 기술표준화 과정을 설명하는 틀을 구성하였다. 이러한 분석틀을 이동통신산업에 적용한 결과, 혁신체제에 따라 기술표준화의 방식도 상이하다는 점을 확인하였다. 단절적 기업관계의 체제에서는 기술표준화가 시장을 통해 이루어지는 반면 협력적 기업관계의 체제에서는 기업연합의 조정활동을 통해 이루어진다. 한편 국가주도적 체제 내에서도 기업관계가 단절적인 체제에서는 상대적으로 국가가 기술표준화 과정에 더욱 깊숙이 개입하고 기업관계가 단기적인 반면, 기업관계가 협력적인 체제에서는 기업관계가 장기적이다.

• Structural Engineering and Mechanics
• /
• 제35권6호
• /
• pp.659-676
• /
• 2010

An energy-based fatigue life prediction framework was previously developed by the authors for prediction of axial and bending fatigue life at various stress ratios. The framework for the prediction of fatigue life via energy analysis was based on a new constitutive law, which states the following: the amount of energy required to fracture a material is constant. In this study, the energy expressions that construct the new constitutive law are integrated into minimum potential energy formulation to develop new finite elements for uniaxial and bending fatigue life prediction. The comparison of finite element method (FEM) results to existing experimental fatigue data, verifies the new finite elements for fatigue life prediction. The final output of this finite element analysis is in the form of number of cycles to failure for each element in ascending or descending order. Therefore, the new finite element framework can provide the number of cycles to failure for each element in structural components. The performance of the fatigue finite elements is demonstrated by the fatigue life predictions from Al6061-T6 aluminum and Ti-6Al-4V. Results are compared with experimental results and analytical predictions.

• 한국수학교육학회지시리즈A:수학교육
• /
• 제54권3호
• /
• pp.261-282
• /
• 2015

The purpose of this study was to provide insights on making Korean mathematics framework by analytical comparison of three major assessments such as the NAEP 2015, the TIMSS 2015 and the PISA 2015. This study focused on the key differences and common themes of mathematics frameworks among three major assessments. In order to achieve this purpose, mathematical frameworks of the NAEP 2015, the TIMSS 2015, and the PISA 2015 were analyzed and compared. The criteria of the comparison were content domain and cognitive domain. The comparing criteria of content domain were based on NCTM content standards and cognitive domain were used the three understanding levels of Jan de Lange's pyramid model. Based on these comparisons, researchers discussed that Korea mathematical framework was needed to have a set of content categories that reflect the range of underlying mathematical phenomena and a set of cognitive levels which contain the range of underlying fundamental mathematical capabilities including consideration of contexts.

• 컴퓨터교육학회논문지
• /
• 제15권2호
• /
• pp.67-73
• /
• 2012

유동 수치 해석 분야의 실험들은 복잡한 수학 방정식의 계산 과정으로 이루어져 있고, 이러한 실험을 수행할 수 있는 거대한 계산 자원과 그 자원을 효율적으로 관리할 수 있는 환경을 요구한다. 현재 수치해석을 위한 특정 목적의 실험을 수행할 수 있는 e-사이언스 환경에 대한 연구는 많이 진행되고 있으나 다양한 공학 교육 분야의 유동 해석을 위한 통합 수치해석 연구 프레임워크를 개발한 사례는 거의 없는 실정이다. 따라서 본 논문에서는 그리드 자원을 효율적으로 이용할 수 있는 UNICORE를 기반으로 다양한 유동 해석을 위한 기본 프레임워크를 설계하고, 이에 대한 프로토타입으로 세 가지 유동 응용들에 대한 수치해석 연구를 통합 환경에서 수행할 수 있는 e-사이언스 프레임워크를 개발하였다.

• 정보처리학회논문지C
• /
• 제12C권2호
• /
• pp.289-300
• /
• 2005

본 논문에서는 정책 기반 네트워크 관리에 대한 중앙 집중 형태와 분산 형태의 모델을 비교하고 모델링하기 위한 분석적인 프레임워크를 제안했다. 정책기반 네트워크는 다양한 응용분야에서 도입되고 있으며, 정책의 제공구조는 응용에 따라 각기 다른 처리성능을 가질 수 있다. 따라서 우리는 각 PBNM 모델이 정책 적용을 수행할 때 성능과 확장성 측면에서 평가하였다. 측정 메트릭으로는 정책 프로비저닝 시간, 트래픽 발생량, PDP 처리율, 전역 충돌 감지에 대한 정성적 시뮬레이션을 평가하였다. 그 결과 PBNM을 도입할 때 주의 깊은 응용 특성에 대한 분석에 따라 적절한 구조가 도입되어야 함을 제시하고 있다. 본 논문에서 나타난 PBNM 모델은 현재 제안되고 있는 방식들 사이에 장단점을 정량화하기 위한 시도였다.

• Steel and Composite Structures
• /
• 제44권5호
• /
• pp.651-676
• /
• 2022

Most of the experimental, theoretical, and numerical studies on the stability of functionally graded composites are deterministic, while there are full of complex interactions of variables with an inherently probabilistic nature, this paper presents a non-intrusive framework to investigate the stochastic nonlinear buckling behaviors of porous functionally graded cylindrical shells exposed to inevitable source-uncertainties. Euler-Lagrange equations are theoretically derived based on the three variable refined shear deformation theory. Closed-form solutions for the shell buckling loads are achieved by solving the deterministic eigenvalue problems. The analytical results are verified with numerical results obtained from finite element analyses that are conducted in the commercial software ABAQUS. The non-intrusive framework is completed by integrating the Monte Carlo simulation with the verified closed-form solutions. The convergence studies are performed to determine the effective pseudorandom draws of the simulation. The accuracy and efficiency of the framework are verified with statistical results that are obtained from the first and second-order perturbation techniques. Eleven cases of individual and compound uncertainties are investigated. Sensitivity analyses are conducted to figure out the five cases that have profound perturbative effects on the shell buckling loads. Complete probability distributions of the first three critical buckling loads are completely presented for each profound uncertainty case. The effects of the shell thickness, volume fraction index, and stochasticity degree on the shell buckling load under compound uncertainties are studied. There is a high probability that the shell has non-unique buckling modes in stochastic environments, which should be known for reliable analysis and design of engineering structures.

• ETRI Journal
• /
• 제36권3호
• /
• pp.490-497
• /
• 2014

The market performance of WiBro in Korea has not been as expected, and its rapid diffusion in the near future is unlikely owing to the existence of competing services. There has been little research on the factors affecting this low market diffusion. This study is based on an analytical framework in which a lack of service capability and the insufficiency of service-related activities have resulted in the current poor market performance. An expert survey was conducted on WiBro specialists and verified using the analytical hierarchy process method. The result of this analysis is as follows: underinvestment in network deployment and marketing, insufficient promotional policies, and a shortage of service capabilities are to be analyzed as the main causes of WiBro's low market diffusion.

• 한국소성가공학회:학술대회논문집
• /
• 한국소성가공학회 2000년도 추계학술대회 논문집
• /
• pp.109-112
• /
• 2000

This paper presents an analytical study that can predict the path-dependent forming limits for bilinear strain paths. To predict the forming limit diagrams(FLD), the analytical procedure was performed within the framework of Marciniak and Kuczynski approach by introducing the effect of the existence of strain gradient over the stretching punch. The predicted path-dependent forming limits of an anisotropic sheet were compared with the published experimental results. It was found that the predicted path-dependent forming limits were in good agreement with the experimental data.