• Proceedings of the Korea Concrete Institute Conference
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• 1997.10a
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• pp.653-658
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• 1997

Recently, carbon Fiber sheet (CFS) is frequently used for strengthening deteriorated concrete structures. To strengthening damaged structures, the property and characteristic of the bond between CFS and the concrete surface must be understood. The tensile test of single lap shear specimen was performed to study bond strength, bond stress distribution and stress transfer between CFS and concrete surface according to the bond length. Based on the test results, there were ultimate influence length (UIL) in which bond stress was distributed, and ultimate strain reduction ratio (USRR) by which strain was reduced linearly. Bond resisting force (BRF) was estimated by UIL and USRR, and which was compared with ultimate loads. According to the results of comparison, it was shown that ultimate bond strength could be estimated reasonablely by BRF.

• Journal of Institute of Control, Robotics and Systems
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• v.10 no.1
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• pp.60-65
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• 2004

A flexible tactile sensor away with 8 H 8 tactile elements is designed and fabricated. The material of the sensor is PVDF(polyvinylidene fluoride) film and flexible circuitry is used in the fabrication fur the flexibility of the sensor The experimental results on static and dynamic properties of the sensor are obtained and examined. The signals of a contact pressure to the sensor are sensed and processed in the DSP system in which the signals are digitalized and filtered. The processed signals of the sensor outputs are visualized in a personal computer for illustrating the shape and force distribution of a contact object. The reasonable performance for the detection of contact state is verified through sensing examples.

• Proceedings of the CALSEC Conference
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• 2001.08a
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• pp.127-140
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• 2001

New Information Technology Contributes to raising of Business Productivity in many Construction Companies. The Application of Construction Integrated Management System is Expected to Save the time of decision-making in Business Management and shorten the Closing Account Schedule. Construction Integrated Management System Based on ERP(Enterprise Resource Planning) System allows to Control core Business Procedure by Monitoring Technique on Real-time. In This Paper, We achieves 10% Raise up Business Productivity in Site Business Area, and 30% Raise up Business Productivity in Head Office Business Area by means of DW-CIMS (DAEWOO Construction Integrated Management System)

• Proceedings of the Korea Information Processing Society Conference
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• 2016.10a
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• pp.228-231
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• 2016

현재 한 번의 공격으로 많은 피해를 줄 수 있는 국가기반시설 위주의 제어시스템은 사이버 공격의 대상으로 가장 적합하다고 할 수 있다. 이에 대비해 제어시스템에서 주로 사용되는 DNP3는 한정적이고 반복된 트래픽을 주고받아 화이트리스트 기반 보안 기법이 사이버 공격으로부터 효과적으로 시스템을 보호할 수 있다. 본 논문에서는 제어시스템에 알려져 있는 취약점에 대해서 소개하고, 화이트리스트 보안 기법을 적용하고 규칙을 정의하여 이상 징후를 탐지하였다.

• Proceedings of the Korea Concrete Institute Conference
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• 2000.04a
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• pp.257-262
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• 2000

The purpose of this study is grasping quality aggregate using Bottom Ash of Industrial Waste Incinerator, and is evaluating possibility of application as construction materials. Cement and Fly ash is used with binder of aggregates using bottom ash. It is tested for basic property and strength of artificial aggregates, and the results are compared with crushed stone and elution tests is done for environmental safety. In the results of tests, it is confirmed that basic property and strength are lowe than crushed stone but the aggregates have possibility of application as artificial lightweight aggregates. When it is manufactured with aggregates, it is sage environmentally because of protecting elution of harmful heavy metals.

• The Journal of Korean Academy of Orthopedic Manual Physical Therapy
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• v.9 no.2
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• pp.59-67
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• 2003

The purpose of this study was to identify the effects of eccentric exercise of affected hip abductor muscles on Gait balance in patient with hemiplegia. 30 patients with hemiplegia were recruited among in and out patients of Gil Hospital(age x=50.5, SD=10.1, range 37-80. post stroke days x=383.2, SD=309.3, range 57-1165). These patients were divided into eccentric and control groups by random sampling. TUG were used for this study. Paired t- test was used to identify the effects of eccentric exercise of hip. The results were stastically significantly differences in the effect of exercise between experimental and control groups by TUG(p<0.05). The results indicate that the eccentric exercise of affected hip abductor muscles is effects on gait balance in patient with hemiplegia.

• Proceedings of the KIEE Conference
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• 1994.07a
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• pp.129-131
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• 1994

Rectangular type hybrid step motor is designed to generate thirty percents higher torque than existing step motors. The torque for the motor is generated by the electromagnetic force at the air gap between the stator and rotor. The generating torque is proportioned to the rotor volume, i. e. rotor diameter. The main idea in this study is that the diameter of rotor is increased to generate more torque for the same overall motor size. This motors are manufactured by varying the shape of the teeth width of the stator and rotor. The optimum shape of the teeth is selected from the standpoint as smaller step angular accuracy.

• Proceedings of the IEEK Conference
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• 2006.06a
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• pp.133-134
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• 2006

In this paper the platform system for IEEE 802.15.4 Low Rate WPAN is designed and fabricated. IEEE 802.15.4 Low Rate WPAN system serves the functions and realization of home-area network. According to the IEEE 802.15.4 standard, there are two modes, One is BPSK modulation in 868/915MHz frequency band. The other is O-QPSK modulation in 2.45GHz frequency band. In this paper we implemented the platform system mounted in one PCB board in 868/915MHz frequency band of IEEE 802.15.4 Low Rate WPAN system. We measured that the platform system which consists of digital part and RF part has good performance. Also RF part is realized by design and fabrication of the RF transceiver IC. The key issue is to make the platform system which provides the function of Low Rate WPAN system to meet the requirement of IEEE 802.15.4 standards.

• 한국약용작물학회:학술대회논문집
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• 2008.05a
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• pp.275-275
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• 2008

• 한국약용작물학회:학술대회논문집
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• 2008.05a
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• pp.318-319
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• 2008