• 한국소음진동공학회논문집
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• 제26권7호
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• pp.844-850
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• 2016

This study pertains to the extraction of the road noise component of signals from a vehicle's interior noise via the traditional frequency domain and time domain system identification methods. For road noise extraction based on the frequency domain system identification method, the appropriate matrix inversion strategy is investigated and causal and non-causal impulse response filters are compared. Furthermore, appropriate data lengths for the frequency domain system identification method are investigated. In addition to the traditional road noise extraction methods based on frequency domain system identification, a new approach to extract road noise via the time domain system identification method based on a parametric input-output model is proposed and investigated in the present study. In this approach, instead of constructing a higher order model for the full-band road noise, input and output signals are processed in the subband domain and lower order parametric models optimal to each subband are determined. These parametric models are used to extract road noises in each subband; the full band road noise is then reconstructed from the subband road noises. This study shows that both the methods in the frequency domain and the time domain successfully extract the road noise from the vehicle's interior noise.

• 한국자동차공학회논문집
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• 제20권2호
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• pp.85-89
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• 2012

This paper presents a study on the system identification of the in-situ output shaft torque measurement system using a non-contacting magneto-elastic torque transducer installed in a vehicle drivline. The frequency response (transfer) function (FRF) analysis is conducted to interpret the dynamic interaction between the output shaft torque and road side excitation due to the road roughness. In order to identify the frequency response function of vehicle driveline system, two power spectral density (PSD) functions of two random signals: the road roughness profile synthesized from the road roughness index equation and the stationary noise torque extracted from the original torque signal, are first estimated. System identification results show that the output torque signal can be affected by the dynamic characteristics of vehicle driveline systems, as well as the road roughness.

• 한국정보기술학회논문지
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• 제16권12호
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• pp.69-74
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• 2018

도로명주소는 도로마다 이름을 짓고 건물마다 번호를 부여하는 2차원 평면상의 위치표시방법이다. 그러나 도로명주소는 행정, 법률행위 등에 필요한 부분만을 나타내고 있어 다양한 도로의 주요특성과 비주거지역 등을 제대로 나타내지 못한다. 이는 또 다른 목적을 가진 위치식별방법으로 독립하게 되어 서로 다른 위치식별 방법들을 표준화하기가 더욱 어렵다. 본 논문은 우리나라의 서로 다른 위치표시로 인한 통합의 어려움 극복과 2차원 평면적인 한계를 벗어나기 위하여 도로기반 3D 위치식별코드를 연구한다. 이는 도로에 기반하여 다양한 위치식별방법을 통합하고 공간 좌표를 식별하는 방법으로서, 4차 산업혁명시대에 적합한 국토의 3차원 디지털 코드화에 관한 연구이다.

• 한국소음진동공학회논문집
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• 제22권8호
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• pp.720-728
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• 2012

It is important for identification of noise and vibration problem of tire to consider influence of interaction between road and tire. A quantification of road noise is a challenging issue in vehicle NVH due to extremely complicated transfer paths of road noise as well as the difficulty in an experimental identification of input force from tire-road interaction. A noise caused by tire is divided into road noise(structure-borne noise) and pattern noise(air-borne noise). Pattern noise is caused by pattern shape of tire, which has larger than 500 Hz, but road noise is generated by the interactions between a tire and a vehicle body. In this paper, we define the quantitative analysis for road noise caused by interactions between tire and road parameters. For the identification of road noise, the chassis dynamometer that is equipped $10mm{\times}10mm $ square cleat in the semi-anechoic chamber is used, and the tire spindle forces are measured by load cell. The vibro-acoustic transfer function between ear position and wheel center was measured by the vibro-acoustic reciprocity method. In this study three tires with different type of mechanical are used for the experiment work.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2008년도 정기학술발표대회 논문집
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• pp.901-904
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• 2008

측량은 건설 공사 전반에 수행되고 있기 때문에 측량이 건설 공사에 미치는 영향은 매우 크다고 할 수 있다. 그러나 측량의 리스크 식별 및 관리에 관한 연구는 다른 분야에 비해 미비하다. 따라서 본 연구에서는 건설 공사의 시공 시 수행되는 측량에 관한 효율적인 리스크 관리를 목적으로 건설 공사 중 도로 공사에 수행되는 측량을 대상으로 리스크 관리에 관한 연구를 수행하였다. 일반적으로 리스크 관리는 리스크 식별, 분석, 대응의 3단계로 수행되지만, 본 연구에서는 리스크 식별 및 분석 단계에 초점을 맞추어 도로 공사의 측량 리스크 체크리스트 작성을 위한 연구를 수행하였다. 리스크 인자의 식별에는 도로 공사 시방서, 측량법, 도로 공사 체크리스트를 사용하였으며, 식별된 리스크를 바탕으로 도로 공사의 측량 관련 체크리스트를 작성하였다. 작성될 체크리스트는 측량 관련 전문가 집단의 면담 조사를 통하여 중요도를 분석하여 측량 리스크 체크리스트를 작성하였다.

• 영어영문학
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• 제55권3호
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• pp.441-458
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• 2009

The Imperial Road is Jean Rhys s unfinished manuscript, rejected by publishers for its openly racist tone. Although it describes Rhys s actual visit to Dominica in 1936, it is not a transparent recollection of the travel but a recreation informed by racial dynamics of the 1970s when she wrote the text. This paper examines the manuscript as a troubled (and troubling) response to what Rhys perceived as racial rejection from Dominica at the wake of political independence. Rhys s representation of white Creole womanhood significantly depends on an interwoven configuration of racial dynamics and sexual politics, where an oppressive white European man facilitates a white Creole woman s cross-racial identification with Afro-Caribbeans. However, the political and literary landscape of the West Indies in the 1970s made such cross-racial identification untenable. As a result, The Imperial Road is full of disturbing racial hatred, prejudice, and resentment. And yet, it also reflects Rhys s honest and serious concern over a white Creole s racial identity in postcolonial Dominica, raising a difficult question: How would a postcolonial age change a white Creole identity that belongs neither to the colonized nor to the colonizer (or both)? In The Imperial Road, unable to identify with Afro-Caribbeans, the white Creole is disoriented in time and space, lost at home, stuck between the past and the present, not knowing how to participate in a postcolonial homeland. Through the narrator s racial disorientation, The Imperial Road exposes the white Creole s fundamental dependence on other Creoles.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 1996년도 추계학술대회논문집; 한국과학기술회관, 8 Nov. 1996
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• pp.338-344
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• 1996

In this paper, a semi-active suspension adapting to road variation which also considers the frequency snesitivity of human is proposed. First, a road adapting controller composed of system identification and LQG control is designed. Using the extended least squares method, the road property is estimated by system identification as it varies, and the LQG controller considering the estimated road property and the frequency sensitivity of human is designed. Next, the semi-active suspension is made, which tracks the performance of the active suspension with the road adapting controller. Through numerical simulation, the performance of the proposed semi-active suspension is compared with that of a non-adaptive semi-active suspension with frequency-shaped performance index. As a result, we see that the road adapting semi-active suspension has better performance.

• 한국도로학회논문집
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• 제16권6호
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• pp.181-189
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• 2014

PURPOSES : Ambiguous decision on whether rural or urban area for road design can increase the construction cost and restrict the land use of surrounding area. However, administrative classification on rural and urban area is not directly related to road design because of this classification is not based on the engineering viewpoint, so method which can explain the road design context is required. METHODS : Method which enables to identify the area for road design is suggested based on the deceleration expected to be experienced by drivers who use the road section concerned. Deceleration rate corresponding to the area such as rural or urban suggested in Road Design Guideline is used as the criteria to identify the area by comparing this value with the estimated deceleration rate at the road section concerned. Speed profile method is utilized to derive the deceleration rate, and speed estimation way for reflecting both road geometry and intersection is suggested using stopping sight distance concept. RESULTS : The procedure of the method application is suggested, and the design example utilizing the method is provided. CONCLUSIONS : The method is expected to be used to identify the area for road design with engineering viewpoint, and design consistency among the roads with similar driving environment can be made.

• 제어로봇시스템학회논문지
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• 제12권4호
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• pp.395-399
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• 2006

A method to recognize unpaved road region using a 3D depth measurement system is proposed for mobile robots. For autonomous maneuvering of mobile robots, recognition of obstacles or recognition of road region is the essential task. In this paper, the 3D depth measurement system which is composed of a rotating mirror, a line laser and mono-camera is employed to detect depth, where the laser light is reflected by the mirror and projected to the scene objects whose locations are to be determined. The obtained depth information is converted into an image. Such depth images of the road region represent even and plane while that of off-road region is irregular or textured. Therefore, the problem falls into a texture identification problem. Road region is detected employing a simple spatial differentiation technique to detect the plain textured area. Identification results of the diverse situation of unpaved trail are included in this paper.

• 대한공간정보학회지
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• 제1권2호
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• pp.195-206
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• 1993

도형정보와 속성정보를 동시에 다루는 도로관리 정보구축을 위해서는 이를 연결하고 도로의 일정한 영역을 고유하게 나타낼 수 있는 단위와 고유식별자가 필요하다. 그러나 현재 도로에 법적으로 지번이 부여되어 있으나 일관성이 없어 사용하기 어렵고, 일부도로에는 도로단위와 고유번호가 설정되어 있으나 대부분의 도로에는 설정되어 있지 않은 실정이다. 따라서, 본 연구의 목적은 효율적인 도로관리 정보구축을 위한 기초로서 도로정보의 위치를 기록, 판별할 수 있는 방안과, 이를 바탕으로 사례지역인 서울시 강남구 일부지역에 시험적용 해 활용방안을 모색하여 한국도시에서의 도로정보체계 구축 시 방향 및 지침을 제시하는 데 있다. 이를 실행하기 위하여, 도로관리 정보구축을 위한 도로위치판별 설정방법으로 첫째, 기본적인 문제해결 방안으로 도로 단위설정과 고유식별자 방안을 설정하였고, 둘째, 도로의 공간적 위치정보를 부여하기 위해 해당 각 도로마다 주소정보를 부여하는 방법을 설정하였고, 셋째, 설정된 도로단위를 바탕으로 도로관리정보의 위치를 나타내기 위해 도로중심선을 기준점으로 이용한 상대좌표방법을 설정하여 적용하였다.