Woo-Seong Che

A study on real time integrated lane detection and vehicle tracking method with side-mirror cameras

Vehicle detection in real-time from rear-side of a host vehicle is one of important problems in Lane Change Assistance. In this paper, we propose a vision system for real-time vehicle and lane detection and tracking using two cameras, which are equipped under the wing mirror both left and right side. From the input images, EDLines algorithm is used for line segment detection in real-time. According to the achieved data, lane detection is developed by analyzing angles of the line segments, and area between two lanes on the same side of vehicle is defined. In the vehicle detection, based on the brightness and darkness between vehicle and road, vehicle is detected in real-time using the simple algorithm. Finally, kalman filter is used in vehicle tracking for vehicle information such as distance or speed.

An intensity function for inclined multimode optical fiber sensors

The performance of a two-optical-fiber intensity-modulated sensor depends on the geometrical parameters of the sensors. A significant improvement in the performance is expected if the transmitting and receiving sfibers are configured in inclined feature instead of being configured in parallel feature. The linear operating range and sensor sensitivity depend on the angle between transmitting and receiving fibers, core and fiber radius, and inter-fiber spacing. Moreover, the intensity function plays an important role in designing multimode optical fiber sensor, especially, in designing two-optical-fiber intensity-modulated sensor. As being a design parameter of the sensor, it is essential in determining the sensor sensitivity due to the reflected power changes. The mathematical model of the intensity function applicable to inclined geometrical configurations is developed and simulated responses are studied. Experimental validation of the mathematical model is performed using carefully designed experiments. The simulated responses and the experiment results are compared with the responses of another mathematical model which was developed by Gang He.

Micro-step position control with a simple voltage controller using low-cost micro-processor

This paper presents micro-step operation of low power step motor for dashboard using a direct connection of low cost micro processor. The micro-step operation of stepper motor is very important in an indicating instrument such as speed and tacho meter.

Optical Path Analysis and Experiments for Optical Microphone

The theoretical formulations are derived for calculating optical power change for intensity modulated fiber optical microphone. The optical power change is due to optical paths, misalignment and geometry of optical coupler. Based on the theoretical equations, three different optical couplers are simulated with respect to several angles of optical couplers. In order to evaluate the formulation, a multi-mode to multi-mode coupler which is one of abovementioned optical couplers is designed and characterized by carving out both static experiments and dynamic experiments. Considering experimental results, this paper conclude that the theoretical formulations is very useful for design optical coupler and this kind of fiber optic sensor is adequate to microphone.

Interfacial Microstructures and Characterization of the Titanium—Stainless Steel Friction Welds Using Interlayer Technique

The joints of dissimilar metals and alloys are increasing demand as essential parts of aerospace, nuclear and cryogenic applications. One of the greatest challenges for design engineers is to develop and implement fast and cost-effective industrial procedures to join titanium with stainless steel and aluminum. Regardless of the welding conditions, such high specific properties of the metal combinations cannot be fusion welded in conventional method, because of the formation of highly brittle intermetallic compounds in the fusion zone. However, solid-state joining processes, friction-welding process contemplated to offer the highest potential for successful joining of bimetallic components. The friction welding techniques are highly efficient and it has the advantage of far greater weldability and reduces the risk of interfacial reaction. In the present investigation, microstructure formation at the interfaces of friction welds between titanium and stainless steel with and without interlayer are discussed. The formation of fragile intermetallic compounds like Fe–Ti and Cr–Ti are completely avoided between the titanium and stainless steel by introducing of interlayer material. The interlayer material successfully controlled the undesirable compounds from the weld interface and developed a new weld interface. The new microstructure formation at weld interface enhanced the final properties of the titanium to stainless friction welds.

Irradiance Distribution Analysis of Inclined-cut Multi-mode Optical Fiber for Optical Microphone Design

For designing intensity modulation type optical microphone, the irradiance distribution which can be applied to inclined-cut geometrical configuration is suggested. The model is important in analysis of response characteristics for intensity modulation type optical microphone. To overcome low sensitivity problem in intensity modulation type optical microphone, inclined-cut optical fiber is considered here. Based on optical geometry, the inclined-cut optical fiber sensor is designed and fabricated. The experiments are carried out to evaluate sensor performance.

DESIGN AND FABRICATION OF A NOVEL NONCONTACT VIBRATION SENSOR USING INCLINED-CUT OPTICAL FIBER

This optical fiber sensors are being widely used alternative to conventional sensors in various applications because of small size, relatively light weight, high sensitivity and wide bandwidth. Also it has immunity to electromagnetic interferences, because of their dielectric, glass, or plastic nature, they are usually small and light, and they allow remote electric signal opto-electronic conversion and processing. In various uses of optical fiber, intensity modulation type sensor due to misalignment has practical usefulness because it can be realized in ease with low cost and simple structure. To overcome low sensitivity problem in intensity modulation type optical fiber sensor, inclined-cut optical fiber is considered here. Based on optical geometry, the inclined-cut optical fiber sensor is designed and fabricated. The experiments are carried out to evaluate sensor performance. The optical fiber sensor developed in this paper has sufficient precisions and therefore it is available to measure the vibration without contact.

The development of bilge separation sensor system for improving accuracy

Demand of enhanced bilge separation sensor system has been recently increased due to the severe regulation reinforcement of MEPC (marine environment production committee). Up to date bilge separation sensor has to be extremely accurate and highly reliable. To design and build such a bilge separator, a precise oily water separation level sensor that distinguishes oil from water is critical. Three dimensional simulations have been carried out to figure out the characteristics of capacitive level sensors, which grounds the finding of the parameters required to design the sensors. The parasitic capacitance problem which is inherent to capacitive level sensors has been taken care of. This paper concludes with the future research direction that can be pursued with the newly defined parameters of the capacitive level sensors