• Proceedings of the Korean Society of Precision Engineering Conference
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• 2003.06a
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• pp.338-342
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• 2003

Hybrid machine is based on hardware technologies of machine tool and software technologies of open architecture controller. In machining technology, combination technology of turning, milling, and grinding and in machining energy technology. combination of mechanical, electrical, and chemical technology are developed. This paper describes hybrid machine technology for combination of machining, on-machine measurement, on-machine CAM, and on-machine remote monitoring and control in open architecture controller environment. For on-machine measurement, non-contact measurement technology based on CAD information is developed. For on-machine CAM, interactive CAM program for automatic NC program generation and tool path simulation is developed. For generation on-machine remote monitoring and control, suitable interface method between web program and CNC is proposed. The developed hybrid machine technology is implemented in 3 axes milling machine for evaluation of operablity.

• Journal of the Korean Society for Library and Information Science
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• v.36 no.2
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• pp.25-38
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• 2002

Libraries today have to investigate the methods connecting the results from continuously collected customer information with their activities, policies, and procedures. In other to prevent customer secession and to obtain new customers, it is necessary to effectively offer the processes for every customer related service, that is, the contact, the reguest, satisfaction, etc. This is Customer Relationship Management(CRM). This study aims to introduce the concept, the constitution elements, and theories for importation and application of CRM, and to investigate the possibility for library application. Also, it is emphasized the necessity for new marketing strategy Putting the customer value Preferentially in libraries.

• Proceedings of the KSR Conference
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• 2007.05a
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• pp.792-797
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• 2007

This study investigates the change of the temperature and fatigue property of the braking disk (GC25-30 material) for the railway vehicle. The average temperature is measured about $100^{\circ}C$ and the maximum temperature is measured over $200^{\circ}C$ by non-contact sensor from Seoul to Chun-an. In the $20^{\circ}C-300^{\circ}C$. The Fatigue tests did for new and used disk specimens. The fatigue test results of new disk specimens were similar due to the temperature change. But the compare of specimens between new disk and old disk, The fatigue life of old disk specimens was smaller than new disk specimens about 10%.

• 한국정보통신설비학회:학술대회논문집
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• 2006.08a
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• pp.91-94
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• 2006

In this paper, we deployed the tunnel inspection and monitoring system by wireless sensor network. It is shown that the wireless sensor network which is composed of sensor, wireless communication module, and gateway system can be applied to tunnel monitoring system. Sensors included herein are acceleration transducers, fire-alarm sensors, water-level sensors, and magnetic contact sensors. It is also found that the wireless sensor network can deliver sensing data reliably by ad-hoc networking technology. The gateway system that can send the sensing data to server by CDMA (code division multiple access) is developed. Finally, monitoring system is constructed by web service technology, and it is observed that this system can monitor the present state of tunnel without difficulties. Furthermore, the above system provides an alternative to inspect and monitor the tunnel efficiently where the conventional wired system cannot be applied.

• Fibers and Polymers
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• v.4 no.4
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• pp.145-150
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• 2003

Polypropylene nonwoven fabrics were exposed to He/$O_2$ atmospheric pressure glow discharge plasma. Surface chemical analysis and contact angle measurement revealed the surface oxidation by formation of new functional groups after plasma treatment. Weight loss (%) measurement and scanning electron microscopy analysis showed a significant plasma etching effect. It was investigated in low-stress mechanical properties of the fabrics using Kawabata Evaluation System (KES-FB). The surface morphology change by plasma treatment increased surface friction due to an enhancement of fiber-to-fiber friction, resulting in change of other low-stress mechanical properties of fabric.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.24 no.6
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• pp.647-652
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• 2015

A probe pin is a key component of LED inspection equipment. The probe pin makes contact with the LED electrodes and supplies an electric current. Because the mechanical and electrical homogeneity of the probe surface affects the service life and reliability, its characterization is essential. For this study, the hardness was measured using a micro-Vickers hardness test. Moreover, the thicknesses of the plating at different locations and the elemental compositions were examined using an FE-SEM. The uniformity of the plating was found to be acceptable because palladium was detected consistently throughout the tested domain. In addition, the hardness of the surface was determined to be higher than that of the typical palladium range, which is attributed to the use of undercoated nickel.

• The Plant Pathology Journal
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• v.16 no.3
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• pp.162-165
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• 2000

Screening of effective fungicides, determination of effective fungicide application time and investigation of the emergence of resistant isolates to fungicides were conducted to establish effective chemical control strategy of gray blight of tea (Camellia sinensis) in Korea. Systemic fungicides, such as bitertanol, were effective for controlling gray blight when the fungicides were sprayed within 3 days after cutting tea leaves for harvest. Sprayed immediately after cutting, contact fungicides such as chlorothalonil were also effective, but control efficacy rapidly decreased with lengthening of the intervals between cutting and spraying. Korean isolates of P. longiseta and P. theae were still sensitive to bitertanol or fluazinam. However, the isolates highly insensitive to copper hydroxide or thiophanate-methyl have already emerged in Korea. Therefore, careful attention should be paid to use of fungicides and spraying programs for the effective control of gray blight of tea in Korea.

• International Journal of Railway
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• v.5 no.2
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• pp.71-76
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• 2012

Recently, axle load, operating speed and traffic density on railroads have had a tendency to increase and thereby cause additional pressure applied on used track. These operating conditions frequently result in service failure due to wear caused by wheel-rail contact and fatigue damage under cyclic loading. Among rail defects, the transverse crack, which has been the most dangerous type of fatigue damages, is developed from the subsurface crack near the rail running face and grows perpendicular to the rail surface. Therefore, it is necessary to investigate systematically the growth behavior of transverse crack for rail steel under mixed mode. In this study, the fatigue crack growth behavior of the transverse crack in rail steel was experimentally investigated under mixed-mode variable amplitude loadings.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.29 no.11 s.242
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• pp.1534-1541
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• 2005

Unlike industrial manipulators, the manipulators mounted on service robots are interacting with humans in various aspects. Therefore, safety has been one of the most important design issues. Many compliant robot arms have been introduced for safety. It is known that passive compliance method has faster response and higher reliability than active ones. In this paper, a new safety mechanism based on passive compliance is proposed. Passive mechanical elements, specifically transmission angle of the 4-bar linkage, springs and shock absorbing modules are incorporated into this safety mechanism. This mechanism works only when the robot arm exerts contact force much more than the human pain tolerance. Validity of this mechanism is verified by simulations and experiments. It is shown that the manipulator using this mechanism provides higher performance and safety than those using other passive compliance mechanisms or active methods.

• Proceedings of the Korea Contents Association Conference
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• 2016.05a
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• pp.177-178
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• 2016

사회가 점점 더 복잡해지고 정보통신 기술의 급격한 발달 및 스마트 폰을 비롯한 모바일 기기들의 일반화로 인해 라이프 로그와 같은 빅 데이터에 대한 사회적인 관심 및 활용이 필요성이 증대되고 있다. 특히 일반인들뿐만 아니라 장애인들이 쉽게 접근할 수 있는 공간자료를 포함한 소셜미디어(SNS) 자료들은 장애인들의 라이프 스타일을 분석할 수 있는 각종 가치 있는 정보들을 포함하여 장애인들에게 꼭 필요한 여러 사회복지 서비스를 발굴하고 제공할 수 있는데 효율적으로 활용될 수 있다. 따라서 본 연구에서는 장애인들이 자발적으로 가장 많이 생산해 내는 자료인 공간정보를 포함한 소셜미디어 데이터를 통해 장애인들에게 가장 필요한 생활 밀착형 사회서비스를 발굴하는 시스템을 제안한다.