• 연구논문집
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• 통권27호
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• pp.87-99
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• 1997

Present paper describes on/off design performance of a 50KW turbogenerator gas turbine engine for hybrid vehicle application. For optimum design point selection, relevant parameter study is carried out. The turbogenerator gas turbine engine for a hybrid vehicle is expected to be designed for maximum fuel economy, ultra low emissions, and very low cost. Compressor, combustor, turbine, and permanent-magnet generator will be mounted on a single high speed (82,000 rpm) shaft that will be supported on air bearings. As the generator is built into the shaft, gearbox and other moving parts become unnecessary and thus will increase the system's reliability and reduce the manufacturing cost. The engine has a radial compressor and turbine with design point pressure ratio of 4.0. This pressure ratio was set based on calculation of specific fuel consumption and specific power variation with pressure ratio. For the given turbine inlet temperature, a rather conservative value of $1100^\circK$ was selected. Designed mass flow rate was 0.5 kg/sec. Parametric study of the cycle indicates that specific work and efficiency increase at a given pressure ratio and turbine inlet temperature. Off design analysis shows that the gas turbine system reaches self operating condition at N/$N_{DP}$ = 0.53. Bleeding air for turbine stator cooling is omitted considering low TIT and for a simple geometric structure. Various engine performance simulations including, ambient temperature influence, surging at part load condition. Transient analysis were performed to secure the optimum engine operating characteristics. Surge margin throughout the performance analysis were maintained to be over 80% approximately. Validation of present results are yet to be seen as the performance tests are scheduled by the end of 1998 for comparison.

• KSCE Journal of Civil and Environmental Engineering Research
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• 제31권3A호
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• pp.145-152
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• 2011

Current Bridge Specification for Highway Bridges adopts a simplified method to determine sectional forces of abutment wing by dividing its area into four sections. This simplified method was developed in Japan when numerical analysis was not mature and computer resources were expensive. This simplified method has been with us without modification. This study evaluates the problem of current design practice to improve the design guideline for abutment wing. In this study, a finite element model of abutment wing based on shell elements was developed to obtain accurate sectional force. In addition, foreign design specifications regarding abutment wing were thoroughly examined. It has been observed that sectional forces obtained from the simplified method produce inaccurate results under various geometric shapes. Thus, it is recommended that two dimensional plate analyses should be adopted for future design of abutment wing wall.

• Journal of the Korean Society of Costume
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• 제60권3호
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• pp.66-83
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• 2010

Huafu is the traditional clothing of the Han Chinese as the significant cultural symbol of Chinese civilization. The resuscitation of Huafu is an exemplification for the pride of a nation, due to China's rapid economic development and a craze for Chinese cultures. Huafu's resuscitation is not only introducing the traditional design factors of Huafu into the contemporary fashion but also reflects the image of Chinese style created to modernize works. Through the study of the history of Huafu, it could be summarized that Ruqun(Zu-chin), Shenyi(Shen-yee), and Shan were the most important and typical types. The characteristics of Huafu were primary colors or strong contrast with achromatic colors, flora and fauna patterns, and geometric patterns. The clothing aesthetic of Huafu could be summed up as spacious, delicate, gorgeous, clandestine, and unconventional character. There were lots of elements in Huafu that could provide inspiration for contemporary fashion designers, such as forms, colors, patterns, details, and also the aesthetic. Based on the analysis of the Chinese designers who applied the elements of Huafu into contemporary fashion design, it could be recognized that the Chinese designer's works were made using the elements of traditional Huafu directly or using new fabrics and techniques to give a modern sense, but also embodies the Huafu's clothing aesthetic at the same time. In the wake of the resuscitation and publicity of Huafu, the essential factors of Huafu will be able to provide inspiration for designers not only for Chinese but also around the world.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 한국소음진동공학회 2012년도 추계학술대회 논문집
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• pp.93-99
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• 2012

This paper presents an optimal design of magnetorheological (MR) fluid based mount (MR mount in short) which can be applicable to vibration control of diesel engine of ship. In this work, a mixed - mode including squeeze mode, flow mode and shear mode is proposed and designed. In order to determine actuating damping force of MR mount required for efficient vibration control, excitation force from diesel engine is analyzed. In this analysis, a model of V-type engine is considered and the relationship between velocity and pressure of gas in torque of the piston is derived. Subsequently, by integrating the field-dependent rheological properties of commercially available MR fluid with the excitation force an appropriate size of MR mount is designed. In addition, in order to achieve maximum actuating force with geometric constraints design optimization is undertaken using ANSYS software. Through the magnetic density analysis, optimal design parameters such as bottom gap and radius of coil are determined.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• 제33권9호
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• pp.16-26
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• 2005

The aerodynamic design of a proprotor for the Smart UAV adopting tiltrotor aircraft concept is conducted in this study. Since proprotor of tiltrotor aircraft is operated at both rotary and fixed wing mode with single configuration rotor, the proprotor has to be designed to meet performance requirements for both flight modes. The aerodynamic design of proprotor is accomplished by combining three sources of data - the proprotor performance data, the aerodynamic data of vehicle, and the performance data of engine. The performance analysis code for proprotor is based on the combined momentum and blade element theory and validated by comparison with the TRAM data. In order to design configuration for a proprotor satisfying requirements for both rotary and fixed wing mode, various kind of performance maps are constructed for many performance and configuration parameters. From the analysis the twist angle of 38 degrees and the solidity of 0.118 are decided to be the optimal geometric parameters for both operating conditions.

• Korean Journal of Computational Design and Engineering
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• 제17권6호
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• pp.443-455
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• 2012

The configuration of a musculoskeletal (MS) system is closely related to the individual motions of the human body. Many researches have been focused on evaluating the associations between the MS configuration and the individual motion using patient-specific MS models, but it still remains a challenging issue to accurately predict the motion by differed configurations of the MS system. The main objective of this paper is to predict the changes of a patient-specific gait by altering the geometric parameters of the hip joint using function-based morphing method (FBM). FBM is suitable for motion analysis since this method provide a robust way to morph a MS model while preserving the biomechanical functions of the bones. Computed-muscle control technique is used to calculate the muscle excitations to reproduce the targeted motion within a digital MS model without the motion-captured data. We applied this approach to a patient who has an abnormal gait pattern. Results showed that the femoral neck length and the angle significantly affect to the motion especially for the hip abduction angle during gait, and that this approach is suitable for gait prediction.

• Journal of Korean Society of Transportation
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• 제21권1호
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• pp.21-40
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• 2003

A traffic accident analysis method was developed and tested based on the highway alignment risk indices using geographic information systems(GIS). Impacts of the highway alignment on traffic accidents have been identified by examining accidents occurred on different alignment conditions and by investigating traffic accident risk indices(TARI). Evaluative criteria are suggested using geometric design elements as an independent variable. Traffic accident rates were forecasted more realistically and objectively by considering the interaction between highway alignment factors and the design consistency. And traffic accident risk indices and risk ratings were suggested based on model estimation results and accident data. Finally, forecasting traffic accident rates, evaluating the level of risk and then visualizing information graphically were combined into one system called risk assessment system by means of GIS. This risk assessment system is expected to play a major role in designing four-lane highways and developing remedies for highway sections susceptible to traffic accidents.

• The Research Journal of the Costume Culture
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• 제21권5호
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• pp.655-670
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• 2013

The purpose of this study is to identify the figurative characteristics and symbolic meanings of the patterns of royal families in the late Joseon Dynasty based on the theoretical examination as well as the overall characteristics of the colors based on the quantitative analysis of colors. This study focused on the costumes of King Young royal families in the late Joseon Dynasty which is the last costume of Joseon Dynasty and classified 129 relics under preservation for the analysis. This study analyzed the colors using the digital data in the picture brochure as the previous studies did and presented the color palette. Based on this, a variety of textile designs that are developed by using the traditional patterns and colors could be applied to the modern fashion designs. For Patterns used in costumes of King Young royal families, the five pattern categories include animals, plants, letters, and geometric patterns and the final category of other types. The features of color in the costume were v tone of Y color and lt and p tones of Y color. The implication of this study is to develop textile designs which reflects conversion of past and modern cultures and cultural identity by applying the traditional cultural elements through literature review and empirical study and theses developed 8 textile designs could be applied to the various modesrn fashion designs.

• Korean Institute of Interior Design Journal
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• 제18권6호
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• pp.85-95
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• 2009

Since the early stages of philosophy in ancient Greece, reason has prevailed over sensation, based on the idea that it was the recognition of the ideal world existing as the archetype of objects. Abstract concepts followed geometric models, though they be invisible. However, from the beginning of 20th century, people began to be interested in the idea in metaphysical philosophy, that reason might not be a characteristic best representing the human spirit, and that a human being is composed of emotion, desire and the physical body, in addition to reason. The study shows that paintings and constructional space have shown similar changes through the stream of time, and have a synchronistic relationship within the range of the formative arts, based on the contemporary philosophy. First of all, it defines the change of contemporary thought and its analysis words. And consider the Corporality which is one characteristic of contemporary thought. This study shows the characteristic of the Corporality in the architectural space of Rem Koolhaas whom it selected the architecture who is influenced by Post-structuralism. In conclusion, It compares paintings and architectural space and looks into the correlations among them in the category of the Corporality which is a pont of view from contemporary thought. As a result of the comparison, the Corporality in paintings is defined as (1) An escape form Reason, (2) An emphasis of experienced events and (3) A destruction of forms. It defines the architectural space of Rem Koolhaas corresponding with the Corporality in paintings has a characteristic of (1) The space of Body without Organs, (2) Becoming spatial concept of events and (3) An Unrestrained Form.

• The Journal of the Korea Contents Association
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• 제12권10호
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• pp.63-71
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• 2012

Depth understanding is important for stereoscopic and various methods including space design and cognitive science should be taken account in contents production. Among them, human scientific engineering such as human factor needs to be touched. More specifically, when the stereoscopic designer determines a binocular disparity, the viewpoint of the camera has to be matched with that of the audience. In this process, the structural problem by the distortion due to the dichoptic error is happened, Therefore, 3D sweetening process based on geometric re-analysis and human scientific engineering to minimize the visual fatigue is significant. This paper analyzes the inconsistency problems of the viewpoint in stereoscopic images, and we produce the stereoscopic image contents based on human factors.