• Journal of Korean Institute of Industrial Engineers
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• v.22 no.2
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• pp.165-177
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• 1996

This paper presents a navigation method for a mobile robot which can follow a path drawn on a monitor screen. The current position and heading direction of the mobile robot are obtained using a single camera from a single image of the guide mark projected on a convex mirror. This proposed method eliminates the need to rotate or tilt the camera to track the guide mark, because the convex mirror and a stationary camera provide a panoramic view of the surrounding area. As guide marks, fluorescent lamps on the ceiling, door frames, or any other natural line segment can be used without adding any artificial elements to them.

• Journal of the Korean Society for Precision Engineering
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• v.6 no.4
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• pp.71-83
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• 1989

The optimization in the machining process has been a long-standing goal of the manufacturing community. The optimization is composed of two main subjects;one is to select an optimum cutting condition, and the other is to detect the emergency situation and take necessary actions in real-time base. This paper proposes a reliable and practical guide system whose purpose is the optimization of cutting conditions, and the detection of tool failure in the machining process. The optimal cutting conditions are determined through the estimation of tool wear rate and the establishment of access- ible field from the measured cutting temperature and force. Tool breakage is detected by the normal force component acting on minor flank face extracted from on-line sensed feed force and radial force. In experiments, the proposed guide system has proved availability for the decision of reliable cutting conditions for the given tool-work system and the detection of tool breakage in ordinary cutting environments.

• Proceedings of the KSR Conference
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• 2004.10a
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• pp.854-861
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• 2004

LRT(Light Rail Transit System) is devided into steel-wheel train, LIM and rubber tired AGT(Automated Guide-way Transit System) The main features of LRT are low construction cost, low space, low noise, Environment-friendly, fastly, low maintenance cost. it's a civil transit transfer system of new generation became popular advanced nation. In this study, the beginning designed manufactureing rubber tired AGT turnout and guide-way system for the field application. We hope reliability for the system shall home production of turnout and guide-way

• Smart Structures and Systems
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• v.17 no.5
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• pp.725-742
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• 2016

This paper is focused on stiffness ratio effect and a new method to specify the best pattern of piezoelectric patches placement around a hole in a plate under tension to reduce the stress concentration factor. To investigate the stiffness ratio effect, some different values greater and less than unity are considered. Then a python code is developed by using particle swarm optimization algorithm to specify the best locations of piezoelectric actuators around the hole for each stiffness ratio. The results show that, there is a line called "reference line" for each plate with a hole under tension, which can guide the location of actuator patches in plate to have the maximum stress concentration reduction. The reference line also specifies that actuators should be located horizontally or vertically. This reference line is located at an angle of about 65 degrees from the stress line in plate. Finally two experimental tests for two different locations of the patches with various voltages are carried out for validation of the results.

• Journal of the Korean Society of Safety
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• v.27 no.6
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• pp.160-165
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• 2012

The process of panel line in the shipyard produce the panel of outside planking which is located the side and bottom of a ship. The stiffeners or plates are welded onto the plates in this process. In this study, the panel line was performed to work process analysis and was analyzed into the IDEF0(Integration Definition) model that is functional modeling methodology. Also the panel line was analyzed to find out the risk factor and expected accident/safety guide from each process. And then this outputs were applied to the IDEF0 model. The mobile application which is designed by ooCBD(Object-oriented Component Based Development) method is able to use the output data of the process analysis in the panel line. This mobile application could be used by employees and safety managers without regard for working location and time.

• Advances in pediatric surgery
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• v.15 no.2
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• pp.113-120
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• 2009

Pediatric lymphangioma can occur at any site. However the neck is the most common site. There are two treatment modalities (surgical excision and intralesional injection) for lymphangiomas. But, the treatment guide line for lymphangioma has not been established, yet. The aim of this study is to establish the treatment guide line based on our experience with lymphangiomas. Medical records of 82 cases of lymphangioma were reviewed retrospectively. On MRI (magnetic resonance image) findings, lymphangiomas were divided into 4 groups by the proportion of the cyst bigger than 2 cm in diameter of the tumor; group A-proportion of cyst occupies more than 75%, group B-proportion of the cyst 50~75%, group C-25~50%, and D in less than 25%. All patients were treated with OK-432 intralesional injection as the initial treatment. The effective response rates of OK-432 in group A & B were 88.2% and 88.8%, respectively. Group C response was 38.0% and D only 20.0%. Twenty-three patients received surgical excision. The result of surgical excision was generally satisfactory. Surgical site infection occurred in 1 case and postoperative bleeding in 1 case. Theses results indicate that intralesional injection of OK-432 could be the first line therapy in group A & B. In group C, OK-432 would be better as the first line therapy than surgery. For the group D, surgical excision should be the first line of treatment.

• Proceedings of the KSR Conference
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• 2010.06a
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• pp.1416-1422
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• 2010

Monorail has been classified as straddled type and suspended type. However, Inchon Wolmi Eunha rail, a center guide type first ever introduced in the world, uses a new concept Y-Beam as guide rail. Since Y-Beam takes horizontal loads of monorail through guide wheels, it is an essential structure for the safe operation along with concrete surface and steel beam which take vertical loads through main tires. This study presents the characteristic and reliability of Y-Beam and Y-Beam fixture, clamp, which are not only taking horizontal loads but also guarantying both guiding and stability of monorail and holding power supply line.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2004.08a
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• pp.359-367
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• 2004

In this research on-line model for the prediction of the effective strain distribution in strip on finishing mill process is presented. To describe the effective strain distribution in strip, three guide points and a distribution fitting variable are used. On-line models to get these points and fitting variable non-dimensionalization method and least square method were used with FEM simulation results. The model is developed using strip only FEM simulation as reference sets and compared with roll coupled FEM simulation results as perturbed sets. The on-line model to describe effective strain distribution shows good agreement with coupled FEM analysis results.

• KEPCO Journal on Electric Power and Energy
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• v.5 no.4
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• pp.249-256
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• 2019

A full-scale test line was established to verify the electrical environmental interferences caused by the HVDC ±500 kV Double Bipole overhead transmission line with metallic return conductor, which is scheduled for construction in Korea and the fullscale test was conducted for one year. And through the human perception test of the DC electric-field under the HVDC Double Bipole line, the threshold value at which the human detects DC electric field was investigated to verify the validity of the design guide for the HVDC ±500 kV Double Bipole overhead transmission line. The polarity configuration of the HVDC ±500 kV Double Bipole test line was arranged diagonally with the same polarity in terms of the electrical environment disturbance and operation. The test line utilized the 6-bundle arrangement to prevent the corona discharge taking into account the domestic social acceptability. The test results show that the HVDC ±500 kV Double Bipole transmission line generated very little corona discharge from the conductors. Therefore, both DC electric field and ion current density met the domestic design guide for DC overhead transmission lines. Also, the human perception test of DC electric fields under the test line showed that 70% of participants did not recognize the DC electric field even when exposed to 23 kV/m.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2006.07a
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• pp.418-418
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• 2006