• Transactions of the Korean Society of Automotive Engineers
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• v.7 no.5
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• pp.186-193
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• 1999

In this paper, a full vehicle model is developed to analyze toe and camber changes due to rack height variation and compliance. The AutoDyn7 program developed in G7 project is used for the computer simulation. Steady state cornering test was done to find the understeer gradient. Imposing a pulse steer input, Frequency Response Function(FRF) of yaw rate and lateral accelerations were evaluated. To verify the stability, the rhombus using four parameters is employed. Steer characteristics were evaluated by changing the rack height and the bushing lateral stiffiness. which installed between the low control arm and the chassis.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2014.11a
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• pp.227-228
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• 2014

마그네슘은 금속 재료중 화학적 활성이 높아 내식성 향상을 위해 표면처리 공정이 반드시 필요하다. 플라즈마 전해 산화를 통한 산화 피막 생성 후 좀더 높은 내식성 향상을 위해 전착 도장법을 사용할 수 있다. 본 논문에서는 전원 인가 방식에 따라 pulse 전원을 on/off 비율에 따른 피막 두께 변화를 측정 하였고 전착 도장을 시행 하여 cross cut test를 통한 부착성 시험을 진행해 on/off 비율 1:4 조건에 250V 전압을 인가 하였을 때 부착성이 가장 우수함을 확인 하였다. 또한 플라즈마 전해 산화 후 탕세 공정을 통해 전착 도장의 내열탕 시험 후 표면 blister의 개선 효과를 얻을 수 있었다.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.52 no.11
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• pp.548-556
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• 2003

Switched reluctance motor(SRM) has simple magnetic structure, and needs simple power electronic driving circuit. It is very useful for wide range adjustable speed drive system. But, SRM drive generates large vibration and acoustic noise because it is commutated individually by step pulse m.m.f of each phase. In the vibration and acoustic noise characteristics. the considerable vibration and noise is induced by radial deforming of stator, so the frequency of dominant vibration and noise is coincident with the frequency of natural frequency of mechanical structure. This radial vibration force is generated by abrupt change of radial magnetic force in the phase commutation region. This paper studied about simple electromagnetic structure of SRM using auxiliary compensating winding for the reduction of noise and vibration. This auxiliary winding is coupled with all phase windings electromagnetically and absorb and transfer magnetic energy variation from phase to other phase. By this interaction of phase windings and compensating winding can reduce abrupt radial force change and vibration and acoustic noise. In this paper the improvement effect is examined by the test of prototype machine.

• Proceedings of the KIEE Conference
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• 1999.07e
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• pp.2063-2065
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• 1999

PD pulses have about one nanosecond rise time in the $SF_6$ gas insulation. These pulses propagate through GIS chamber to PD sensors in the form of the electromagnetic radiation. In this paper, we investigated the characteristics of disc sensors and monopole antenna, by putting high frequency signals into the test cell in $SF_6$ gas by means of a Ins rise time pulse generator and 60Hz power supply respectively. Also, we measured PD quantity from the needle electrode and the location effect of output terminal beneath the disk sensors.

• Proceedings of the KIEE Conference
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• 1998.07e
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• pp.1670-1674
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• 1998

Now and then there are many electrical accidents between cable and line post insulator which is degraded by long time using, causing leakage current on the surface of insulator. In this paper it is denied that the 22.9 KV-y distribution lines are protected by binding cover which is needed from fog or rainy moisture, surges occurring by swiching or lightening pulse. It is analyzed to investgate the unballanced transfer characteristics and reflection coefficient by using bidding cover and non-cover. It was tested the radio interference voltage in the test room. In the factory it was tested the amount of leakage current causing on the surface of insulator in the state of no load and 70(%) load.

• Proceedings of the KIEE Conference
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• 1998.07f
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• pp.1899-1901
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• 1998

A five-level VSI(Voltage Source Inverter) is introduced as a SVC(Static Var Compensator) like a large scale power source. The problems in using SVC are that the power device can easily be destroyed by voltage unbalance and accurate reactive power control is difficult because of voltage variation. A asymmetrical PAM(Pulse Amplitude Modulation) switching pattern is proposed to solve this problem and analyze both fundamental component and harmonic current in the system. Through experimental results of 3.5 kVA experimental test system. It is confirmed that DC capacitor voltage can be controlled by asymmetrical PAM switching pattern control.

• Journal of Sasang Constitutional Medicine
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• v.22 no.4
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• pp.98-105
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• 2010

1. Objectives The purpose of this case is to report that Soeumin patient diagnosed as Grave's disease was treated with Palmulgunja-tang and antithyroid drugs in combination. 2. Methods From April 7, 2010 to June 30, 2010, we treated him with Palmulgunja-tang and antithyroid drugs. We took his weight, pulse and checked visual analog scale(VAS) to evaluate the symptoms of Grave's disease. 3. Results After treatment, this patient's thyroid function test were improved faster than with western medicine treatment only in 2009. The symptoms also were improved. 4. Conclusions This case study showed an efficient results by giving Sasang Constitutional treatment in treatment of Grave's disease.

• Proceedings of the Korean Society of Agricultural Engineers Conference
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• 1999.10c
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• pp.271-276
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• 1999

This study is performed to evaluate an elastic properties and acid-resistance of concrete using pine needle ash(PNA). Materials used for this experiment are PNA , normal portland cement, natural fine and coarse aggregate. Test results show that the highest ultrasonic pulse velocity , dynamic and static modulus of elasticity is achieved by 5% PNA filled PNA concrete, which has showed similar with those of thei normal cement concrete. Acid-resistance of PNA concrete is increased with increase of the contnet of PNA , it is 1.29 times of the normal cement concrete by 5% PNA fille PNA concrete an d2.57 times by 15% PNA filled PNA concrete . Accordingly , PNA concrete wil greatly improve the properties of concrete.

• Magazine of the Korean Society of Agricultural Engineers
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• v.42 no.3
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• pp.107-113
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• 2000

This study is performed to examine the physical and mechanical properties of concrete with fly ash. Test results show that the unit weights of concrete with fly ash are decreased 1-3% and the highest strength is achieved by 10% filled fly ash concrete with it is increased 7% than that of the normal cement concrete. the ultrasonic pulse velocity is in the range of 3.705~4.204m/s and the dynamic and static modulus of elasticity is in the range of 271$\times$103 ~289$\times$103kgf/cm2 and 208$\times$103 ~262$\times$103kgf/cm2 respectively. The acid-resistance is increased with increase of the content of fly ash. It is 1.2 times of the normal cement concrete by 10% filled fly ash concrete and 1.7 times by 30% filled fly ash concrete respectively.

• Journal of Korean Academy of Fundamentals of Nursing
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• v.9 no.3
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• pp.513-523
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• 2002

Purpose : This study aimed to investigate the effect of foot massage on sleep, vital signs and fatigue in the elderly who live in their Home. Method: Data were collected from 20 elderly who live in the Seoul-Kyunggi province area by convenience sampling and analyzed the change of sleep and sleep satisfaction, vital signs(pulse, respiration, systolic and diastolic blood pressure) and general fatigue between pre and post foot massage using Paired t- test at 0.05 of significance level. Result: There were very significant difference in the sleep and fatigue between pre and post foot massage. Conclusion: Foot massage can improve the sleep and decrease fatigue, therefore we recommend to use foot massage as a effective sleep related nursing intervention in the elderly who live in their home.