• Computers and Concrete
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• 제19권5호
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• pp.545-553
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• 2017

In the authors' previous study, an axial force-flexural moment (P-M) interaction curve model was proposed to evaluate fire-resisting performances of reinforced concrete (RC) column members. The proposed method appeared to properly consider the axial and flexural strength degradations including the secondary moment effects in RC columns due to fire damage. However, the detailed P-M interaction curve model proposed in the authors' previous study requires somewhat complex computational procedures and iterative calculations, which makes it difficult to be used for practical design in its current form. Thus, the aim of this study was to develop a simplified P-M interaction curve model of RC columns exposed to fire considering the effects of fire damage on the material performances and magnitudes of secondary moments. The simplified P-M interaction model proposed in this study was verified using 66 column fire test results collected from literature, and the verification results showed that the proposed simplified method can provide an adequate analysis accuracy of the failure loads and fire-resisting times of the RC column specimens.

• 한국HCI학회:학술대회논문집
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• 한국HCI학회 2006년도 학술대회 1부
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• pp.136-141
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• 2006

가상 품평 또는 가상 훈련 시스템과 같은 고품질, 고정밀 가상현실 애플리케이션에서는 사용자에게 자연스러운 상호작용을 제공하기 위해 고정밀 핸드인터페이스 기술을 필요로 하고 있으나, 현재까지 개발된 상호작용 기술은 산업 현장에서 사용하기에는 어려움이 많다. 따라서 본 연구에서는 직관적이고 자연스러운 상호작용을 위한 기술로서 저항이나 광학 방식 등의 센서를 이용한 기존 연구에 비해 높은 해상도와 빠른 갱신율을 제공하는 절대 변위 센서를 사용한 고정밀 장갑형 핸드 인터페이스 장치 개발과 사용자에게 이질감을 주었던 기존의 투박한 실리던형 핸드 모델이 아닌 가변형 스킨매쉬 기법을 적용한 사실적 핸드 모델 가시화 기술 및 복잡하고 잦은 캘리브레이션 과정을 극복하기 위한 2 가지 형태의 간단한 손동작만으로도 정확하고 신속한 캘리브레이션 작업을 지원하는 매니지먼트 툴의 개발을 제시한다.

• International Journal of Concrete Structures and Materials
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• 제19권1E호
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• pp.3-9
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• 2007

This paper presents a numerical procedure for analyzing the joints between precast post-tensioned segments. A computer program for the analysis of reinforced concrete structures was run for this problem. Models of material nonlinearity considered in this study include tensile, compressive and shear models for cracked concrete and a model for reinforcing steel with smeared crack. An unbonded tendon element based on the finite element method, that can describe the interaction between the tendon and concrete of prestressed concrete member, was experimentally investigated. A joint element is newly developed to predict the inelastic behavior of the joints between segmental members. The proposed numerical method for the joints between precast post-tensioned segments was verified by comparison of its results with reliable experimental results.

• 한국HCI학회:학술대회논문집
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• 한국HCI학회 2006년도 학술대회 2부
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• pp.784-788
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• 2006

UE (User Experience) 조직이나, UI (User Interface or User Interaction) 조직, 사용성 조직이 2000 년대에 들어서 국내에 많이 활성화 되었다. 국내에서는 UE 조직이 구축 될 때에 전략적인 계획에 의해 형성이 되기 보다는 스타일 중심으로 디자인이 부서에 소수인원으로 시작이 되거나, 또는 개발부서의 지원 부서로 시작되다가 확대 되는 경우가 많아 비효율적으로 구축이 되거나 비효율적으로 운영이 되는 경우가 많았다. 본 연구에서는 UE 팀이 조직화 될 때에 고려해야 할 점에 대해 연구를 하였다. 조직의 구축 단계, 역할, 프로세스 등을 중심으로 연구를 하였고 효과적으로 팀을 구축하는 데 중요한 요소에 대해 연구를 하였다. UE 조직의 성숙도를 파악하는 것이 중요하고, UE 팀의 차별화 포지션을 파악하는 것으로 고객과 제공해야 할 것과 방법론을 잘 파악해야 한다 이 결과는 UE 관련한 조직을 구축하거나 운영을 하는데 활용될 수 있다.

• 대한인간공학회지
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• 제25권3호
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• pp.43-47
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• 2006

Macro interface is primarily focused at the organization, while micro interface is primarily focused at the products or services. UI(User Interface) or UX(User Experience) organizations in Korea are institutionalized from 2000 years. Since most of the UI organizations are not institutionalized with the strategic plan, structures of them aren't optimized efficiency. The structure of the organization is conceptualized as having three core dimensions: complexity, formalization, and centralization. The status of the UI organizations in Korea is reviewed with these dimensions. This study issued the key success factors for institutionalization for UI team. Organizational maturity is considered in 5 levels based on a model by CMMI. The UI strategy has to be based the maturity level of the organization.

• Elastomers and Composites
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• 제58권4호
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• pp.173-178
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• 2023

Recently, there has been a significant focus on the development of flexible and stretchable sensors, driven by advancements in electronic devices and the robotics industry. Among these sensors, tactile sensors stand out as the most actively researched, playing a crucial role in facilitating interaction between humans and electronic devices, particularly in robotics and medical applications. This study specifically involves the manufacturing of a capacitive tactile sensor using a relatively straightforward process and sensor structure. Natural rubber and Nitrile butadiene rubber, commonly employed in the rubber industry, were utilized. The dielectric material in the manufactured tactile sensor possesses a porous structure. Notably, the resulting tactile sensor demonstrated excellent sensitivity, approximately 1%/kPa, and exhibited the capability to detect pressures up to 212 kPa.

• Journal of Pharmaceutical Investigation
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• 제38권4호
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• pp.249-254
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• 2008

Solid dispersions of poorly water-soluble drug, atorvastatin, were prepared with Eudragit L100 to improve the solubility by spray dryer. To investigate the correlation between physicochemical properties and dissolution rate of solid dispersions, the samples were characterized by scanning electron microscopy (SEM), differential scanning calorimeter (DSC) and fourier transform infrared spectroscopy (FT-IR). SEM and DSC were found that atorvastatin is amorphous in the Eudragit L100 solid dispersion. FT-IR was used to analyze the salt formation by interaction between atorvastatin and Eudragit L100. The dissolution rate of solid dispersed atorvastatin was markedly increased compared to drug powder in stimulated intestinal juice (pH 6.8). Thus, the solid dispersed atorvastatin using the spray drying method with Eudragit L100 may be effective for the bioavailability.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2006년도 PARALLEL CFD 2006
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• pp.149-149
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• 2006

• 분석과학
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• 제11권6호
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• pp.413-420
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• 1998

물-메탄올 혼합 용액과 계면활성제 용액에서 1-나프탈렌아세트산 나트륨염, 1-나프탈렌말론산 나트륨염, 2-나프탈렌아세트산 나트륨염과 2-나프탈렌프로피온산 나트륨염과 같은 나프탈렌 나트륨 유도체들의 소수성 상호작용에 대해서 연구하였다. 물-메탄올 혼합 용액에서 소수성 상호작용을 측정하였고, 방출선은 red shift가 일어났다. 양이온 계면활성제인 세틸트리메틸암모늄 브롬화 용액에서도 흡수, 방출선은 red shift됨을 보여주었다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2003년도 춘계학술대회 논문집
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• pp.1266-1269
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• 2003

Many studies have indicated that most of a product's cost is fixed early in its lift cycle, before the original design cycle is complete. This implies that we should consider various aspects of product lift cycle at the design stage. This means the need of collaboration in design stage. Because the Internet provides instant access to a wealth of design information, the Internet is used by the collaborative design team members as a medium to share data, information and knowledge, and in some cases for product data management and project management by integrating the Web with appropriate technologies. This paper presents a real-time collaborative design system for powerful interaction performance, based on the Internet and Web technologies. Using The system use the client/server architecture and the purpose of the system is to provide a method that enables real-time view, review and modification of the 3D model through the Internet.