• Journal of Magnetics
• /
• 제19권3호
• /
• pp.273-281
• /
• 2014

This paper presents an innovative design for a low-speed, direct-drive, axial-flux permanent-magnet (AFPM) generator with a coreless stator and rotor that is intended for application to small wind turbine power generation systems. The performance of the generator is evaluated and optimized by means of comprehensive 3D electromagnetic finite element analysis. The main focus of this study is to improve the power output and efficiency of wind power generation by investigating the electromagnetic and structural features of a coreless AFPM generator. The design is validated by comparing the performance achieved with a prototype. The results of our comparison demonstrate that the proposed generator has a number of advantages such as a simpler structure, higher efficiency over a wide range of operating speeds, higher energy yield, lighter weight and better power utilization than conventional machines. It would be possible to manufacture low-cost, axial-flux permanent-magnet generators by further developing the proposed design.

• 한국조경학회지
• /
• 제33권3호
• /
• pp.105-113
• /
• 2005

Human desire is required to be changed variously as time flows. A theme park which is planned to male a good memory including a variety of story, drama, and experience with one of themes is increasingly and currently broaden to be a good economic value of cultural tourism for the local autonomy institution or individual business. The plan for a theme park should be developed to give the tourist satisfaction at studious and ecology educational needs in conformity with our country's distinctive four seasons, its surrounding environment, facilities, and its contents. This design which is called 'Bear theme park' has only one theme focused on a combined effort with a landscape designer and a sculptor. It is estimated that the park must be our country's unique model of a theme park The purpose of this study is to request the designer's direct construction to participate in it by themselves, to solve any problems on the design side, to experience the real construction procedure, and to take the designer's techniques, and skills as soon as the design completed.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2006년도 춘계학술대회 논문집
• /
• pp.195-196
• /
• 2006

Direct laser sintering (DLS) technology for the resign coated sand is one of attractive technologies to produce molds and cores for the foundry industry rapidly and cost effectively. The objective of this case study is to develop casting pilot models using computer simulation technology, DLS RP machine and industrial computed tomography. The proposed casting design was verified by the Z-Cast software in the fields of fluid flow and solidification during the casting process. Casting parts with aluminum alloy using the post-curing treated sand moulds and cores are accurate to dimension and defect free.

• 한국자동차공학회논문집
• /
• 제10권6호
• /
• pp.187-193
• /
• 2002

Since the bus is regarded as the one of the most public transportation systems, research on the safety and facilities of the bus has been increased actively in recent years. In this paper, we concern the design of the bus door mechanism that is composed of many linkages and actuators(or motors). In particular, the folding door mechanism is representative system installed in most of urban buses. To design the folding door mechanism, we construct the kinematic and dynamic analysis model fur computer simulation. Also, the dynamic analysis is accomplished by both direct dynamics and inverse dynamics. Since the folding door mechanism has many design variables, the analysis program is developed to perceive kinematic and dynamic characteristics according to the design variables and simulation conditions.

• 한국자동차공학회논문집
• /
• 제5권1호
• /
• pp.38-48
• /
• 1997

A method for performing kinematic design sensitivity analysis of vehicle suspension systems is presented. For modeling of vehicle suspensions, the multibody dynamic formulation is adopted, where suspensions are assumed as combination of rigid bodies and ideal frictionless joints. In a relative joint coordinate setting, kinematic constraint equations are obtained by imposing cut-joints that transform closed-loop shape suspension systems into open-loop systems. By directly differentiating the constraint equations with respect to kinematic design variables, such as length of bodies, notion axis, etc., sensitivity equations are derived. By solving the sensitivity equations, sensitivity of static design factors that can be used for design improvement, can be obtained. The validity and usefulness of the method are demonstrated through an example where kinematic sensitivity analysis of a MacPherson strut suspension of performed.

• Journal of Ship and Ocean Technology
• /
• 제8권3호
• /
• pp.50-60
• /
• 2004

In this paper, a continuum-based design sensitivity analysis (DSA) method is developed for the weakly coupled thermo-elasticity problems. The temperature and displacement fields are described in a common domain. Boundary value problems such as an equilibrium equation and a heat conduction equation in steady state are considered. The direct differentiation method of continuum-based DSA is employed to enhance the efficiency and accuracy of sensitivity computation. We derive design sensitivity expressions with respect to thermal conductivity in heat conduction problem and Young's modulus in equilibrium equation. The sensitivities are evaluated using the finite element method. The obtained analytical sensitivities are compared with the finite differencing to yield very accurate results. Extensive developments of this method are useful and applicable for the optimal design problems incorporating welding and thermal deformation problems.

• 한국실내디자인학회논문집
• /
• 제20권4호
• /
• pp.21-28
• /
• 2011

As people have paid much attention to their health along with increased interest in high quality of living, they have managed their health in organized manners. Space is a physical field which directly and indirectly interacts with human life, there is a little research on its therapeutic aspect and it is only negatively applied for development of products and alternative medicine. This study aims to identify research trends and flows targeting previous research on therapeutic approaches in domestic space design and present basic materials on space design approaches in a therapeutic view, which will be helpful in ultimate development of space design in theories and practices. As a result, it was discovered that there were only a few papers which were searched with direct key words on curative environment, which indicates that specific studies as therapeutic approaches are insufficient. When the studies were analysed according to annual publications, research on residential welfare and medical space was active, and research on design methodology, design techniques, and design plans was active, but research on psychology, behaviors, laws and institutions was relatively insufficient, which indicates studies on physical and psychological aspects of space design are necessary. In conclusion, it is suggested that further studies on therapeutic environment for direct and specific persons should be defined and classified although there have been relevant studies in various fields.

• Structural Engineering and Mechanics
• /
• 제73권6호
• /
• pp.699-714
• /
• 2020

Force based design (FBD) approach is prevalent in most of the national seismic design codes world over. Direct displacement based design (DDBD) and energy based design (EBD) approaches are relatively new methods of seismic design which claims to be more rational and predictive than the FBD. These three design approaches are conceptually distinct and imparts different strength, stiffness and ductility property to structural members for same plan configuration. In present study behavioural assessment of frame of six storey RC building designed using FBD, DDBD and EBD approaches has been performed. Lateral storey forces distribution, reinforcement design and results of nonlinear performance using static and dynamic methods have been compared. For the three approaches, considerable difference in lateral storey forces distribution and reinforcement design has been observed. Nonlinear pushover analysis and time history analysis results show that in FBD frame plastic deformation is concentrated in the lower storey, in EBD frame large plastic deformation is concentrated in the middle storeys though the inelastic hinges are well distributed over the height and, in DDBD frame plastic deformation is approximately uniform over the height. Overall the six storey frame designed using DDBD approach seems to be more rational than the other two methods.

• 한국지능시스템학회논문지
• /
• 제19권4호
• /
• pp.493-498
• /
• 2009

블루투스는 저전력으로 근거리상의 디바이스들을 무선으로 연결하여 통신하는 기술이나 저속의 통신속도를 갖고 있다. 따라서 파일이나 네트워크상의 동영상 스트리밍을 위한 플레이어는 많지만 Bluetooth를 통한 동영상 재생기는 찾아보기 힘든 상황이다. 낮은 데이터 전송 속도를 갖는 Bluetooth를 통해 동영상을 전송시 인코더로는 높은 압축 효율을 보이는 MPEG-4 AVC/H.264가 적합하다. DirectShow는 Microsoft사가 개발한 소스필터 기반의 멀티미디어 프레임워크이자 API이다. DirectShow를 이용하여 다른 어플리케이션에서도 사용할 수 있는 필터를 쉽고 빠르게 개발할 수 있다. 본 논문에서는 H.264방식으로 인코딩된 동영상 데이터를 블루투스를 통해 전송받아 디코딩하여 재생시킬 수 있는 DirectShow 기반의 플레이어의 설계 및 구현 방법에 대해 기술한다. 다양한 비디오 샘플을 가지고 실험하여 개발된 프로그램의 타당성을 입증하였다.

• 한국전자통신학회논문지
• /
• 제8권9호
• /
• pp.1413-1420
• /
• 2013

연구는 직접 삼킴 치료가 삼킴 기능 회복과 삶의 질에 미치는 효과를 알아보고자 실시하였다. 연구는 뇌졸중 환자 중 삼킴장애로 진단받은 1명의 환자를 2012년 12월 3일부터 동년 12월 21일 까지 3주간 실시하였다. 연구 디자인은 개별사례 연구 방법 중 반전 설계(AB)를 이용하였다. 직접 삼킴 치료는 주 5회, 1회기에 20분씩, 총 10회기를 실시하였고, 결과는 기초선과 직접 삼킴 치료 기간의 점수 차이를 비교하여 분석하였다. 직접 삼킴 치료 후에 뇌졸중 환자의 삼킴 기능은 향상되었고 향상된 삼킴 기능은 삶의 질 향상에 긍정적인 영향을 미쳤다. 이러한 결과를 근거로 임상에서는 직접 삼킴 치료가 가능한 대상자은 조기에 구강 섭취를 통한 직접 삼킴 치료를 실시해 환자들의 삼킴 기능과 삶의 질을 향상시킬 수 있도록 노력해야 할 것이다.