• Economic and Environmental Geology
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• v.24 no.2
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• pp.167-176
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• 1991

The Yeongweol - Yemi area, in the area between the Kagdong thrust fault and Samcheog Coalfield, comprises Paleozoic and Mesozoic sedimentary and igneous rocks. Geologic structures related with thrust movements are dominant in the area. These are thrust faults, imbricate structures and hanging-wall anticline. Thrust sheets were transported from NW to SE and these differ from the Cretaceous Bulkuksa Orogeny of which thrust sheets were transported from N to S. NE - trending folds are dominant, but NW - trending folds and refolded folds are also found. NW - trending folds are only found in the Cambro-Ordovician sedimentary rocks. It might be an indication of the presence of late Paleozoic tectonism in the Korean Peninsula.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.20 no.4
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• pp.65-71
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• 2006

The number of elevator installation increases every year about 15,000. The number of confine-disease of elevator increases every year and then sudden in, sudden stop, error of level indication, stand; those can bring to uneasiness of elevator passenger and malfunction related life accident is increasing. Therefore we researched elevator repair diary of elevator repairing company, APT management office and 119 life rescue for elevator confine-disease during 2004. 1. 1.${\sim}$12. 31. we analyzed the content and the time type and cause of the malfunction and fault for APT elevator. Form the result of 119 life rescue, only power reset is 24[%] and only power failure is 8.2[%] by cause of confine-disease. This paper will be used data of the analysis for mutual relation between Power Quality and malfunction and fault of elevator.

• The Transactions of the Korea Information Processing Society
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• v.2 no.6
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• pp.918-926
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• 1995

In this paper, we study on the systems management for managing ATM network which is especially related to the management of Quality of Service(QoS). QoS management is considered as monitoring function. Therefore, we establish the management model of control and information aspects to manage ATM layer which has resource control, Operation and Maintenance (OAM) functions for performance management and monitoring functions. In particular, we focus on the effective processing of reported performance information caused by the indication of QoS degradation being represented as "QoSAlarm". In order to perform these management activities, the manager can process problem reports of QoS degradation in the proposed manner which uses the priority concepts based on QoS classes. In this circumstance, it is possible to take recovery actions in a predetermined and limited time for managed objects with fault and performance problems.

• Economic and Environmental Geology
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• v.6 no.4
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• pp.219-230
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• 1973

This paper reviews Professor O.J. Kim's work on "The stratigraphy and geologic structure of the Great Limestone Series in South Korea". Although he stated in his paper such as "very few geologists in Korea argue without confident evidences against the age and stratigraphy of the Great Limestone Series which have been rather well established previously in most parts of the regions", he disregarded the Jeongseon type of the Joseon (Chosen) System and modified the Yeongweol and the Pyeongchang types. According to his description, the Jeongseon type is not a different type and it is only due to structural repetition of the Hwajeol and Dumudong Formations of the Duwibong type and its Maggol Limestone. Also, he devided the Sambangsan Formation of the Yeongweol type into the east and west parts along the so-called Jeolgaesan fault, and they are correlated to the Hongjeom Series and Sesong Slate (Seison Slate) of Kobayashi, respectively. Furthermore he established newly Yeongweol type which includes the original Kobayashi's Yeongweol type and the Upper Limestone of the Pyeongchang type. Also, he pointed out that his newly established Yeongweol type is quite correlatable to the Duwibong type. The writer's opinion can be concluded that the Jeongseon type is not simply of structural repetition and structurely the Sambangsan Formation can not be devided into two parts. Also structurely there is no evidence of its correlation to the Sesong Slate as well as his conodont study in his Yeongweol type shows no indication of the correlation. The writer thinks that as to the stratigraphy of the Yeongweol and Jeongseon types of the Joseon System, it should be agreed with the Kobayashi's opinion or should be followed the idea of the very few geologists, he mentioned.

• Fire Science and Engineering
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• v.26 no.1
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• pp.10-15
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• 2012

The fire event occurred in fire proof zone often causes serious electrical problems such as shorts, ground faults, or open circuits in nuclear power plants. These would be directed to the loss of safe shutdown capabilities performed by safety related systems and equipments. The fire event can treat the basic design principle that safety systems should keep their functions with redundancy and independency. In case of a cable fire, operators can not perform their mission properly and can misjudge the situation because of spurious operation, wrong indication or instrument. These would deteriorate the plant capabilities of safety shutdown and make disastrous conditions. In this paper, investigation and cause analysis of cable fire in Nuclear Power Plant, we described the cable fire temperature and functional failure criteria and the cable functional failure temperature evaluation by exposed fire is studied.

• Journal of the Korean Institute of Gas
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• v.2 no.3
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• pp.88-95
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• 1998

Vibration analysis of rotating machinery can give an indication of possible faults thus allowing maintenance before further damage occurs. Current predictive maintenance system installed in Pyung-tak has the ability to diagnose the mechanical problems within the LNG Pump when the vibration exceeds preset overall alarm levels. In this study, LNG pump auto-diagnosis system based upon Windows NT and DSP Board is developed. This system analysis velocity signal acquired from dual accelerometer input monitor system to diagnose pump condition. Many plots which display machine condition are shown and features of vibration are stored in every time. If the fault is found, the system diagnoses automatically using expert system and trend monitoring. Operator checks pump condition intuitively using personal computer monitor.

• Journal of Advanced Marine Engineering and Technology
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• v.38 no.9
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• pp.1146-1149
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• 2014

To discriminate polarities of stator windings for 3 phase induction motors terminal tags of which are not readable, it is possible to utilize the residual magnetic flux present at their rotors as well as to use the way based on external exciting current. The induced voltages are basically decided by parameters such as the quantity of residual flux, the rotator speed by hand force and the phase properties between stator windings. To adopt induced voltages by residual flux for polarity discrimination at sites, the measured voltages by multi-testers need to be readable in magnitude enough to discriminate winding condition with reasonable phase characteristics. This study focuses on the analysis of various connection cases in the expectation that the summing voltages induced by residual flux shall show zero in case of normal connections while the sum becomes greater indication if the connection is in wrong condition. The proposed method is applied to actual motors to disclose how effective it is for polarity discrimination at sites through comparison of output signals between normal and fault connections.

• Journal of Ocean Engineering and Technology
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• v.32 no.4
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• pp.279-286
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• 2018

The use of eco-friendly energy in the offshore plant system is expanding because conventional generators are operated by fossil fuel or natural gas. Eco-friendly energy, which replaces existing power generation methods, should be capable of generating the power for lighting protection equipment, airborne fault indication, parameter measurement, and others. Most of the eco-friendly energy used in offshore plant facilities is solar and wind power. In the case of using photovoltaic power, because the structure must be constructed based as flat solar panels, it can be damaged easily by the wind. Therefore, there is a need for a new generation system composed of a spherical structure that does not require a separate structure and is less influenced by the wind. Considering these characteristics, in this study we designed, fabricated, and tested a unit that could provide the most efficient spherical photovoltaic power generation considering wind direction and wind pressure. Our test results indicated that the proposed system reduced costs because it did not require any separate structure, used eco-friendly energy, reduced carbon dioxide emissions, and expanded the proportion of eco-friendly energy use by offshore plant facilities.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.20 no.5
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• pp.42-48
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• 2006

The number of confine-disease of elevator increases every year and then sudden rise, sudden stop, error of level indication, stand; those can bring to uneasiness of elevator passenger and malfunction accidents related life accident are increasing. For confirmation those malfunction accident, we are measuring and analyzing power quality(Sag, Swell, Interruption) of the actual site and evaluated the performance for stop and stating by testing the two imitation test equipment with EN12016(2004) standard level. This paper will be used data of the analysis for mutual relation between Power Quality and malfunction and fault of elevator.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.21 no.2
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• pp.78-85
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• 2007

The malfunction accidents such as kept within elevator, sudden rise, sudden stop, error of level indication which can bring about uneasiness of elevator passenger and be related with life accident are occurring. However, as there is not field recurrence for this portion and they are accidents that occur and then disappear, it is actually difficult to confirm the reason of accident. Therefore, we made an experiment for tolerance in three models which is being built recently according to EN12016(2004) standard and analyzed the movement characteristics of elevator to study the reason which can bring about confine and malfunction. Furthermore after supplementing measures for malfunction, Finally this paper will be used as reference to suggest methods for malfunction of elevator facility and the analysis for mutual relation between Power Quality and malfunction and fault of elevator.