• 소음진동
• /
• 제8권1호
• /
• pp.87-98
• /
• 1998

A Precise actuator in the pick-up of a DVDR/P(Digital Video Disk Recorder/Player) is required to control position accurately. Therefore, in order to develop a reliable actuator, dynamic characteristics of each part in an actuator should be examined closely. This paper presents systematic design process of an actuator using various analysis methods to confirm fundamental capability and solve performance problems related to dynamic characteristics of an actuator beforehand. Particularly, sensitivity analysis is presented through the program using mass moment of inertia and general equations of rigid body. Through the result of sensitivity analysis, important inferiority causes of actuator are selected and reduced. In the end, dynamic characteristics of manufactured actuators are improved considerably.

• 한국건설관리학회논문집
• /
• 제7권1호
• /
• pp.89-99
• /
• 2006

최근의 주택 개발사업은, 주택시장의 분위기가 사업의 중요 요인 중 하나였던 예전의 상황과 달리, 투자자금의 모집과 사업부지 물색 등의 어려움으로 타당성 분석의 정밀도가 점차 중요시 되고 있다. 주택 개발사업의 타당성 분석에 있어 토지의 이용 가치와 관련된 용적률, 상품수준에 관련된 분양비, 또한 금융비용에 영향을 미치는 공사기간은 중요한 요소이며, 본 연구에서는 이러한 용적률 분양비 공사기간을 개별 프로젝트의 고유특성인 계획특성으로 채택하였다. 따라서 본 연구는 타당성 분석의 체계적인 접근을 위하여 용적률, 분양비, 공사기간을 계획특성인자로 채택하여 타당성 분석 시 공동주택의 계획 특성이 분양원가에 미치는 영향을 회귀분석을 이용하여 분석하였다.

• Journal of the Korean Data and Information Science Society
• /
• 제14권3호
• /
• pp.545-551
• /
• 2003

Robust design is to identify appropriate settings of control factors that make the system's performance robust to changes in the noise factors that represent the source of variation. In this paper we propose how to simultaneously optimize multiple quality characteristics using the principal component analysis of multivariate statistical analysis. An example is illustrated to compare it with already proposed method.

• 대한의용생체공학회:의공학회지
• /
• 제15권3호
• /
• pp.347-354
• /
• 1994

This paper describes a diagnostic protocol of nonlinear dynamic characteristics of biological system using chaos theory. An integrated chaos analysis system for the diagnosis of biological system was designed. We suggest a procedure of attractor reconstruction for reliable qualitative and quantitative analysis. The effect of autonomic nervous system activity on heart rate variability with power spectral analysis and its characteristics of chaotic attractors are investigated. The results show the applicability to evaluate the mental and physical conditions using nonlinear characteristics of biological signal.

• 한국도로학회논문집
• /
• 제20권2호
• /
• pp.97-107
• /
• 2018

PURPOSES : The effects on traffic accidents change with the changing environment. Accordingly, this study analyzes the characteristics of traffic accidents based on the personal characteristics (gender and age) of drivers, and those of 25 autonomous districts in Seoul, and suggests improvements. METHODS : Based on data pertaining to traffic accidents in Seoul, the analysis of accident characteristics was conducted by categorizing the types of traffic accidents according to the drivers' gender and age, and characteristics of 25 autonomous districts in Seoul. Further, for statistical verification, the SPSS software was used to derive influence variables through a multinomial logistic regression analysis, and a method for reducing traffic accidents was proposed. RESULTS : Analysis results show that males tend to be more involved in speed-related accidents and females in low-experience driving-related accidents such as those during parking and alleyway driving. In addition, variables such as age, automobile type, district, and day of the week are found to influence accident types. CONCLUSIONS : This study analyzed the accident characteristics based on personal and city characteristics to reflect the sociological characteristics that influence traffic accidents. The number of traffic accidents in Korea could be decreased drastically by implementing the results of this study in customized safety education and traffic maps.

• 산경연구논집
• /
• 제9권5호
• /
• pp.17-24
• /
• 2018

Purpose - Through the analysis of the characteristics of overseas direct purchase websites and the relevant empirical analysis of the quality of service delivery, the activated theory/strategy and significance of the overseas direct purchase are sorted out. Research design, data, and methodology - In the process, to make more effective analysis, several analysis tools and analysis programmes are used, IBM SPSS Statistics 23.0 and IBM SPSS AMOS 23.0. Results - Among the characteristics of the overseas direct purchase website, the security, convenience and information provided by the overseas direct purchase have already had a positive impact on the satisfaction. The quality of the delivery service is composed of four factors: rapidity, reliability, intimacy and correctness. The research results indicate that the satisfaction level has a positive impact on the re-purchase intention. Conclusions - The significance of this study has the characteristics of overseas direct purchase sites which have confirmed that security convenience and intelligence availability have a positive impact on satisfaction and re-purchase intent. It is important to have a safe and reliable access to shopping sites on overseas direct purchase sites. In the characteristics of overseas direct purchase sites, the interaction have no positive effect on satisfaction and re-purchase intention.

• 융합경영연구
• /
• 제6권2호
• /
• pp.21-29
• /
• 2018

Purpose - This study aimed to check the influence of job characteristics of members of small and medium businesses on authentic leadership awareness of superiors and organizational citizenship behavior, and if the MPS between awareness of authentic leadership and organizational citizenship behavior mediated. This study aimed to find the influence of job characteristics of SMEs members on leadership awareness and organizational citizenship behavior, and the role of motivating Potential Score. Research Design, Data, and Methodology - Total of 150 valid questionnaires were collected. Frequency analysis, descriptive statistical analysis, correlation analysis, simple & multiple regression analysis, and 3-step mediated regression analysis were conducted. Results - The sub-factors of job characteristics all had positive influence on authentic leadership except skill variety and positive awareness on authentic leadership enhances organizational citizenship behavior of members. Also, MPS partially mediates awareness of authentic leadership and organizational citizenship behavior. Conclusion - Providing skill variety such as expanding jobs to members of SMEs does not have influence of positive leadership awareness of leaders and partial mediation of MPS means that job characteristics along with positive leadership awareness on superiors enhance organizational citizenship behavior and contributes in developing the organization.

• 한국측량학회지
• /
• 제35권5호
• /
• pp.349-356
• /
• 2017

In this study, we propose a method to investigate topographic characteristics by applying machine learning which is an artificial intelligence analysis method based on the spatial data constructed using UAV and the training data created through spatial analysis. This method provides an alternative to the subjective judgment and accuracy of spatial data, which is a problem of existing topographic characteristics survey for officially assessed land price. The analysis method of this study is expected to improve the problems of topographic characteristics survey method of existing field researchers and contribute to more accurate decision of officially assessed land price by providing more objective land survey method.

• Tribology and Lubricants
• /
• 제12권4호
• /
• pp.43-51
• /
• 1996

Rapid increase of refrigeration & air-conditioning system (r & a system) in modem industries brings attention to the urgency of research & development as a core technology in the area. And it is required to the compatibility problem of r & a system to alternative refrigerant for the protection of environment. Then, it is requested to study the lubrication characteristics of refrigerant compressor which is the core technology in the r & a system. The study of lubrication characteristics in the critical sliding component is essential for the design of refrigerant compressor. Therefore, theoretical investigation of the lubrication characteristics of rotary compressor for r & a system is studied. The Runge-Kutta method is used for the analysis of the behavior of rolling piston in the rotary compressor. The results show that the rotating speed of shaft and the discharge pressure have an important effect upon the angular velocity of the rolling piston. This results give important basic data for the further lubrication analysis and design of the rotary compressor.

• 한국소음진동공학회:학술대회논문집
• /
• 한국소음진동공학회 2002년도 추계학술대회논문집
• /
• pp.222-227
• /
• 2002

MR(Magneto-rheological) fluid is smart fluid that can change its characteristics then magnetic fields are applied. Recently, many researches have been performed on this MR fluid for the application in a vareity of areas including automobile shock absorbers. This paper describes the design procedure of a MR damper and the analysis results of its dynamic characteristics. MR fluid in the magnetic field shows initial yield shear stress and increasing resistive viscosity with final saturation thereafter. Herschel-Bulkley model is used to simulate the flow characteristics of MR fluid and magnetic analysis is used to identify the magnetic property of the MR fluid in the orifice of the damper. The dynamic characteristics of the damper was predicted and compared with the experimental results for typical sinusoidal excitations.