• 한국의상디자인학회지
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• 제16권1호
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• pp.65-76
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• 2014

The purpose of this study is to examine the influence of conspicuous consumption on wearing attitude of jeans and analyze the difference of purchasing behavior in jeans by gender. Questionnaires were administered to 386 college students living in Deagu and Busan province. Frequency, factor analysis, reliability analysis, regression analysis, t-test, and $X^2$-test were used for data analysis. Conspicuous consumption were categorized into 5 factors such as famous brand preference, brand conspicuous, fashion pursuit, symbol of social position, and imported goods pursuit. Wearing attitude of jeans was categorized into fashion information leadership, fashion innovation, and pursuit of economic. The result of this study showed brand conspicuous, fashion pursuit, symbol of social position, and imported goods pursuit had significant effect of fashion information leadership and brand conspicuous, fashion pursuit, and imported goods pursuit had significant effect of fashion innovation. Brand conspicuous, and symbol of social position had significant effect of pursuit of economic. The indicates that men showed high brand conspicuous of conspicuous consumption and fashion innovation of wearing attitude of jeans. Gender of college students showed significant differences in purchasing place, purchasing price.

• 한국기계가공학회지
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• 제6권3호
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• pp.85-91
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• 2007

This study was carried out to minimize the lifting force of a two hinge type stand mechanism. This unit is designed for the display devices in order to enhance the ergonomics for effective height adjustment and maintenance at any preferred position. The unit will be very useful for the mechanism fabricated with a coil spring and disc springs as a torque generator. The maximum and the minimum torque value should be calculated initially for the smooth lift. And the reasonable torque distribution is necessary to prevent any auto lift and auto dropping at any position because the torque generated by coil spring is more sensitive than disc spring in tilting the position. Therefore, the analysis of the coil spring is requisite to issue the specific torque value depending on the distorted angle with securing reliability of a long time storage condition. After the theoretical torque value was calculated, the evaluation was carried out by making a proto-type sample, then distorted angle was updated by experiment. The result of this study can readily be applied to various units for the optimization of the smooth lift.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2003년도 춘계학술대회 논문집
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• pp.1454-1457
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• 2003

This study was carried out to minimize the lifting force of a two hinge type stand mechanism. This unit is designed for the display devices in order to enhance the ergonomics for effective height adjustment and maintenance at any preferred position. The unit will be very useful for the mechanism fabricated with a coil spring and disc springs as a torque generator. The maximum and the minimum torque value should be calculated initially for the smooth lift. And the reasonable torque distribution is necessary to prevent any AUTO LIFT and AUTO Drooping at any position because the torque generated by coil spring is more sensitive than disc spring in tilting the position. Therefore, the analysis of the coil spring is requisite to issue the specific torque value depending on the distorted angle with securing reliability of a long time storage condition. After the theoretical torque value was calculated, the evaluation was carried out by making a proto-type sample, then distorted angle was updated by experiment. The result of this study can readily be applied to various units for the optimization of the smooth lift.

• 제어로봇시스템학회논문지
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• 제12권7호
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• pp.693-699
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• 2006

An accurate and compact map is essential to an autonomous mobile robot system. For navigation, it is efficient to use an occupancy grid map because the environment is represented by probability distribution. But it is difficult to apply it to the large environment since it needs a large amount of memory proportional to the environment size. As an alternative, a topological map can be used to represent it in terms of the discrete nodes with edges connecting them. It is usually constructed by the Voronoi-like graphs, but in this paper the topological map is incrementally built based on the local grid map using the thinning algorithm. This algorithm can extract only meaningful topological information by using the C-obstacle concept in real-time and is robust to the environment change, because its underlying local grid map is constructed based on the Bayesian update formula. In this paper, the position probability is defined to evaluate the quantitative reliability of the end nodes of this thinning-based topological map (TTM). The global TTM can be constructed by merging each local TTM by matching the reliable end nodes determined by the position probability. It is shown that the proposed TTM can represent the environment accurately in real-time and it is readily extended to the global TTM.

• 전력전자학회논문지
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• 제9권1호
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• pp.30-35
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• 2004

스위치드 릴럭턴스 전동기(SRM)의 구동에서 회전자 위치는 필수적인 정보로서 회전자의 위치에 따라 고정자의 상여자 신호를 동기화 시키는 것이 매우 중요하다. 이를 위해 고해상도의 엔코더나 레졸버가 이용되는데 이는 전동기의 생산가격 상승을 가져오게 된다. 반면 센서리스 기법을 통한 상여자신호의 동기화는 신뢰성 및 고속영역에서 스위칭각이 마이크로프로세서의 샘플링 주기에 의해 영향을 받게 된다. 본 논문에서는 실용적인 방식의 저가형 아날로그 엔코더를 제안한다. 또한 간단한 디지털회로를 사용한 제어신호를 생성하기 위한 제어알고리즘을 제시한다. 실험을 통하여 제안된 아날로그 엔코더의 성능을 검증하고 이를 이용한 스위칭각 제어방법에 대해 검증하였다.

• International Journal of Aeronautical and Space Sciences
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• 제1권2호
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• pp.43-49
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• 2000

The Global Positioning System (GPS) is becoming more attractive navigation means for LEO (Low Earth Orbit) spacecraft due to the data accuracy and convenience for utilization. The anomalies such as serious variations of Dilution-Of-Precision (DOP), loss of infrequent 3-dimensional position fix, and deterioration of instantaneous accuracy of position and velocity data could be observed, which have not been appeared during the ground testing. It may cause lots of difficulty for the processing of the orbit control algorithm using the GPS data. In this paper, the characteristics of the GPS data were analyzed according to the configuration of GPS receiver such as position fix algorithm and mask angle using GPS navigation data obtained from the first Korea Multi-Purpose Satellite (KOMPSAT). The problem in orbit tracking using GPS data, including the infrequent deterioration of the accuracy, and an efficient algorithm for its countermeasures has also been introduced. The reliability and efficiency of the modified algorithm were verified by analyzing the effect of the results between algorithm simulation using KOMPSAT flight data and ground simulator.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2002년도 추계학술대회 논문집
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• pp.530-535
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• 2002

Pneumatic control system has been applied to build many industrial automation systems. But most of them are sequence control type because of their low costs, safety, reliability, etc. Pneumatic servo system is rarely applied to real industrial fields because accurate position control is very difficult due to its nonlinearity and compressibility of air. In pneumatic servo control system, a pneumatic servo valve can be applied, But it is very expensive and has no advantage of low cost compared with a common pneumatic system. This paper is concerned with the accurate position control of a rodless pneumatic cylinder using on/off solenoid valve. A novel Intelligent Modified Pulse Width Modulation(MPWM) is newly proposed. The control performance of this pneumatic cylinder depends on the external loads. To overcome this problem, switching of control parameter using artificial neural network is newly proposed, which estimates external loads on rodless pneumatic cylinder using this training neural network. As an underlying controller, a state feedback controller using position, velocity and acceleration is applied in the switching control the system. The effectiveness of the proposed control algorithms are demonstrated through experiments nth various loads.

• 전력전자학회논문지
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• 제6권1호
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• pp.74-81
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• 2001

스위치드 릴럭턴스 모터(이하 SRM) 구동을 위한 센서리스 설계는 노이즈에 민감하기 때문에 이에 대한 강인성과 신뢰성이 있어야 한다. SRM 구동시에 이들 성분은 소선호 전자회로와 함께 대전류 전력회로와 근접되어 전기적으로 노이즈 환경을 만든다. 또한, 쇄교 인덕턴스와 유한 커플링 캐패시턴스에 의해 어떤 저전압 전류와 전압 측정회로에 노이즈를 일으킬 수 있다. 노이즈를 포함한 전류와 전압은 센서리스 알고리즘의 입력 값으로 사용되기 때문에 위치추정에 대한 오차를 발생한다. 본 논문에서는 입력 노이즈에 대한 높은 강인성과 저항성을 기술하며 퍼지 논리 기반 회전자 위치 추정 알고리 즘과 관측기 모델이 입력 데이터의 오차를 줄이기 위해 사용하였다.

• 한국분말야금학회:학술대회논문집
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• 한국분말야금학회 2006년도 Extended Abstracts of 2006 POWDER METALLURGY World Congress Part 1
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• pp.401-402
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• 2006

All-surface, all-tooth machining and roll forming of cast iron have been used to manufacture the crankshaft position sensor wheel (CPSW). However, these methods pose many problems such as difficult processing, high material cost, and low tooth precision. Thus, we developed a sintered CPSW with an improved detection ability in order to resolve the problems related with the previous methods of manufacturing CPSW by simplifying the process flow and improving tooth precision. The sintering process is introduced in this study. We conducted an experiment to compare the sintered and roll formed products and analyzed the results to evaluate the reliability of the sintering process. Furthermore, we compared and analyzed stress and displacement in the sintered and roll formed products through the "Finite Element Method(FEM)". According to the experimental and FEM results, the sintered product showed satisfactory mechanical properties. It was less expensive to process and lighter and showed better quality than the roll formed product. The results of this study could be applied to design an optimum CPSW using the sintering process.

• 전기학회논문지
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• 제65권8호
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• pp.1436-1441
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• 2016

Currently, partial discharge diagnosis in the field of prevention applied technology and diagnostic equipment is a possible strong limit to remove the noise generated by external or internal I still have one unreliable diagnosis. This technology is the noise removal from signal the time lag analysis algorithms technique is applied by a fundamental. Increasing the reliability in terms of technology spectrum frequence of analysis method for by applying the acquisition through the position of the frequency content and sources of traffic lights partial discharge of the acquisition of signal analysis to judge whether a way diagnosis the environment of the scene, and conditions. Partial discharge signal and make the discharge while building blocks were found through the Analysis. Spectrum frequence of Analysis and wide discharge part, to be more precise, in line with the various functions, including the analysis technique band. Diagnosis and comes up with advanced technology that can detect the presence of a position. This method is portable single device developed for maintenance and mobility and ease and convenience of getting caught by discharge of the pattern analysis and position detection method suitable for a new diagnosis will suggest.