• Proceedings of the Earthquake Engineering Society of Korea Conference
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• 2003.09a
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• pp.403-410
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• 2003

This paper presents the results of experimental studies on the equipment isolation effect in the nuclear containment. For this purpose, shaking table tests were performed. The isolation system, known as Friction Pendulum System (FPS), combines the concepts of sliding bearings and pendulum motion was selected. Peak ground acceleration, bidirectional motion, effect of vertical motion and frequency contents of selected earthquake motions were considered. Finally, it is presented that the FPS systems are effective for the small equipment isolation. Key word equipment isolation, nuclear containment, shaking table test, Friction Pendulum System (FPS)

• Transactions of the Korean Society of Pressure Vessels and Piping
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• v.20 no.1
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• pp.7-15
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• 2024

Environmental qualification is required for safety related electrical equipment under harsh environments located in nuclear power plants according to 10 CFR 50.49 and RG 1.89. As analog technology has recently been replaced by digital technology, NRC established RG 1.209 as a regulatory guideline for environmental qualification of safety related computer-based I&C system located in mild environments, requiring evaluation for electromagnetic compatibility, smoke exposure and type test for actual service conditions such as temperature and humidity. In this paper, the trend of environmental qualification for digital equipment is analyzed by comparing the environmental qualification requirements between digital and analog equipment.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.11
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• pp.4496-4502
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• 2010

In this paper, for the purpose of improving the future domestic train control systems and securing interoperability according to the global development trends of train control systems, we present the test results of communication interfaces to verify the interoperability between CBTC wayside units tentatively installed in Bundang line that is one of the metropolitan area rail transit systems, and the CBTC onboard units developed through the national R/D project. The CBTC onboard equipment developed, has finished its installation and trial tests in the Bundang shunting yard. For the interoperability test, we should make an interface test with wayside equipment tentatively installed in Bundang line. Due to the safety-critical characteristics of train systems, the site test in the section where the wayside equipment is installed, leads to a danger against safety. Therefore, by way of constructing a simulation environment of train control systems, we confirm the T/R data systems of the equipment for interoperability and test the interoperability by applying these systems to developed CBTC onboard equipment.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.24 no.8
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• pp.753-762
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• 2013

This paper forecast that, if the EMC test market for broadcasting and communication materials and equipment reaches a saturated state, such will give rise to adverse effects such as capture phenomenon, rent seeking phenomenon, and stiff test price competition; this in turn will eventually wield a negative impact on our society. Thus, to determine the saturation level of EMC test markets, the size of test markets and test capabilities of the designated laboratories were surveyed. As a result, the operation rate of equipment in the EMC test markets was revealed to be 78 %, suggesting market saturation. Moreover, the wireless, wire, and SAR equipment operation rates reached 65 %, 3 %, and 10 %, respectively, suggesting market saturation. Thus, maintaining the strictness of testing requires limiting the designation of new test laboratories; in light of practices and implementation of laws, however, the relevant administrative agency has difficulty rejecting applications for the designation of laboratories.

• Journal of the Korean Society for Precision Engineering
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• v.18 no.1
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• pp.147-153
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• 2001

This paper proposes a shaker system design for acceleration test of gimbal. Main reason of shaker system design is to give acceleration to the gimbal, which is moving and tracking the target on the tracking test equipment. The shaker system is mounted on the tracking test equipment. It uses the scotch yoke mechanism to have the constant movement in return. The Scotch yoke mechanism changes the rotational movement of constant velocity to simple harmonic motion.

• Journal of the Korea institute for structural maintenance and inspection
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• v.8 no.4
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• pp.223-230
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• 2004

It is growing the application of the removal ground anchor with tension force for earth retaining constructions in the downtown. Nowadays, we can find the compression dispersion anchor on many site. But, it is occur some probelems in behabior of anchors because of impossible to tense p.c strand uniformly with existing equipment due to different length of p.c strand. So we tried to tense each p.c strand uniformly with auto back equipment in-situ test. This study compared and analyzed apply to elastic theory in-situ test results of an existing equipment with those of auto back equipment. As a result of the test, It has been proved that differences of tension force in the existing equipment increases with increasing the number of p.c strand. This can cause an ultimate failure of the concentrated p.c strand and a shear failure of ground. So it has been proved that auto back equipment is necessary.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2013.05a
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• pp.1583-1584
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• 2013

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2011.06a
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• pp.1129-1130
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• 2011

• Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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• 2001.10a
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• pp.15-19
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• 2001

Electronic navigation system onboard have have been developed with recent technology based on new concept such as electronic chart date. The most valuable system of revolution in electronic navigation equipment is ECDIS, which have been developed in order to reduce work load of mariner and give an integrated information by simple means, especially to improve the safety of ship's navigation. In order to be sure the function of ECDIS is satisfied, The international standard have regulated the performance in the standard, so ECDIS should be type approved by the marine equipment authority of each government. There are three basic documents, IEC61174, IEC61162, IEC60945 issued by IMO(International Maritime Organization) which should be used for type approval system of each authority. IEC 61174 include the method of test and required results for operational and functional performance of test equipment. IEC61162 is for sensor interface and IEC60945 is related to the test of environmental condition for general marine radiocommunication equipment. In this paper, we investigate international standard in detail and current approval system of general marine equipment. After that, we present the possible structure of type approval of ECDIS and important considerations of approval system such that ECDIS should be tested as one system not be separated between S/W and H/W.

• Journal of Ocean Engineering and Technology
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• v.26 no.6
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• pp.33-38
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• 2012

In our study, a closed-type penetration unit for standard penetration test (SPT) equipment was developed in order to operate in an underwater environment. This type causes energy dissipation, mainly due to the small gap between an airtight case and moving hammer. The dissipation was estimated through a CFD analysis. The computed dissipated energy was less than 1.2% compared to the potential energy of the hammer with the given gap. Subsequently, the impact energy of the underwater SPT equipment was within 1.2% of that for the SPT equipment on land.