• 한국산업정보학회논문지
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• 제4권4호
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• pp.154-163
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• 1999

본 연구는 산소결핍이 운전자에 미치는 영향을 여러 가지 모형으로 산소 테스트기로 실험하였다. 자동차 실내 유해물질 중 인체와 가장 밀접한 관련이 있는 산소의 농도와 소비량에 대하여 고찰하였고 아울러 산소가 생체내에서 소비되는 다양한 형태를 파악함으로써 본 연구에 대한 이해를 돕고자 한다. 이 시스템에서 고려되는 것은 운전자에게 건강상 유해를 일으키는 기체상 인자의 농도범위를 조사·연구하여 운전자가 얼마간의 운전후에 휴식을 실시거나 환기를 시켜야 한다는 것을 분석한다.

• International Journal of Automotive Technology
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• 제1권1호
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• pp.1-8
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• 2000

This paper reviews the main drivers forcing change and progress in powertrains for passenger cars in the coming years. The environmental drivers of omissions and CO2 will force better technical performance, but customer demand for increased choice will force change in the basic engine design and provide opportunities for alternate configurations of powertrain. Gasoline engines will embody refinements of valve train actuations as well as developments in combustion, especially direct injection and possibly a lean booated form of direct injection. Nevertheless, the conventional, port injected engine will continue to be the dominant engine for some years to come. The high speed direct injection diesel will very soon supplant its indirect injection predecessor completely. It will take an increasing share of the total powertrain market as improved specific power and refinement make it even more attractive to the customer. Car manufacturers will provide diesel models to satisfy this customer demand as well as using the efficiency of the diesel to enable them to meet their fleet CO2 commitments. Both gasoline and diesel engines will see an increasing degree of electrification and partial hybridisation as efficient flywheel mounted electrical devices become available.

• 한국수자원학회논문집
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• 제41권1호
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• pp.87-100
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• 2008

본 연구는 유역통합관리를 위한 대안들의 우선순위를 다양한 요소를 객관적으로 고려하여 산정하기 위해 대안평가지수(alternative evaluation index, AEI)를 개발하였고 이를 적용하였다. 이를 위해 물순환 건전화를 위한 다양한 대안들에 대한 연속유출 모의모형의 효과분석 결과, 다기준 의사결정 기법과 지속가능성 평가모형인 DPSIR(Drivers-Pressure-State-Impact-Response)을 이용하여 대안의 평가지수 및 순위를 산정하였다.

• 한국공작기계학회논문집
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• 제11권2호
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• pp.50-58
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• 2002

The test method using simulator to objectively measure the steering feel from several drivers was proposed. It has also described the ideas to analyse the principal factors affecting the steering feel of the driver using the correlation analysis of the measured data and the questionnaire. Proportional Derivative(PD) controller has been used to measure the steering feel, and the control parameters have been selected to obtain the optimal steering feel. Membership frictions of Sugeno fuzzy model are constructed from the assist torque values calculated from PD controller at each steering state. Moreover to verify the performance, this fuzzy controller has been compared with the another fuzzy controller of which membership frictions are derived from the knowledge of drivers. As a result it can be concluded that the proposed fuzzy controller improves the steering feel at each steering state more than any other conventional methods.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2011년도 전력전자학술대회
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• pp.481-482
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• 2011

New discrete time domain models for the peak current controlled (PCC) power LED drivers in continuous conduction mode include for the first time the effects of time delay in the pulse-width-modulator. Realistic amounts of time delay are found to have significant effects on the average output LED current and on the critical inductor value at the boundary between two conduction modes. Especially, the time delay can provide an accurate LED current for the PCC buck converter with a wide input voltage. The models can also predict the critical inductor values at the mode boundary as functions of the input voltage and the time delay.

• 경영과학
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• 제17권2호
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• pp.115-124
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• 2000

Activity-Based Costing(ABC) is an accounting cost system which allocates the overhead cost to each cost object more accurately. ABC system achieves improved accuracy in estimating the cost of cost object by using multiple cost drivers to trace the cost of activities to the cost objects associated with the resources consumed by those activities. The selection and the aggregation of these cost driver candidates can pose difficult problems. This paper deals with these problems in mathematical programming approach. The first model is formulated as an integer programming model in cost driver selection and the second model is formulated as multi-objective goal programming model in reduction of cost drivers already selected.

• 한국경영과학회지
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• 제29권3호
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• pp.129-144
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• 2004

The goal of this study is to stress the importance of 6sigma quality management in improving the inner capabilities of manufacturing and the performances of the company. Six Sigma is widely recognized today as a process improvement methodology that can cut costs and eliminate defects in manufacturing processes. In this exploratory analysis. a model is developed and tested to fit research model with the structural equation modeling analysis. In conclusion. 6sigma leadership and flexible organizational culture are the important drivers among 6sigma activities. IT management strategy is significantly related to 6sigma quality management. 6sigma quality management is significantly related to financial performance. In addition. customer satisfaction is significantly related to financial performance.

• 전기학회논문지P
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• 제58권1호
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• pp.48-55
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• 2009

In order to keep safe driving conditions under road networks, there are several formations such as road structure, road surface condition, traffic occupancy and supplement of an accurate information of traffic status ahead To support safe-driving on each road formation, each formation is supplied with various information to help the driver. However, in some cases like rapid status change at local-scale geography, traffic information systems often displays insufficient information because of the lack of information correlation. In order to accurately aware the driver, all road formation must be in sync. It is important to supply accurate information to the driver because this information directly impacts the drivers on the road. This paper discusses the amber information to keep the least safety driving over road formations including tunnels and bridges. This paper also will propose the informations for safe-driving conditions, information linkage on the road and rule-base safety information, as ITS technology, being displayed for all drivers under the worst weather conditions.

• 대한산업공학회지
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• 제24권2호
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• pp.199-209
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• 1998

Consumers turn away their face from a vehicle that doesn't satisfy their sensibility and is designed without consideration of driver's performance. In terms of driver's performance, the manual motor processor carries out the primary interactions between driver and vehicle. Therefore, in this paper, time prediction model is studied that is an important part when drivers manipulate the manual control during driving. Experiments were executed for 20 subjects using two kinds of vehicles and regressed to Fitts' Law. The noise filtering method was suggested for the performance times of manipulating the manual control. Especially, it was shown that Fitts' Law derived by an approximation of Shannon's theorem can predict drivers performance time more appropriately than other methods.

• International Journal of Automotive Technology
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• 제7권5호
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• pp.619-624
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• 2006

This paper presents design of a vehicle stop-and-go cruise control strategy based on analyzed results of the manual driving data. Human drivers driving characteristics have been investigated using vehicle driving data obtained from 100 participants on low speed urban traffic ways. The control algorithm has been designed to incorporate the driving characteristics of the human drivers and to achieve natural vehicle behavior of the controlled vehicle that would feel comfortable to the human driver under low speed stop-and-go driving conditions. Vehicle following characteristics of the cruise controlled vehicle have been investigated using a validated vehicle simulator and real driving radar sensor data.