• Proceedings of the Korean Institute of Industrial Safety Conference
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• 1998.05a
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• pp.245-250
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• 1998

각종 전기ㆍ전자기기에서 발생하는 불요 전자파는 노이즈(Noise) 또는 고조파로 불려지고 있는데 이러한 전자파 규제 항목은 크게 두가지(EMI/EMS)로 대분 된다. EMI(Electro magnetic Interference)는 전자파 장해로서 기기 자체에서 발생하는 전자파의 양을 제한하는 것이고 EMS(Electromagnetic Susceptibility)의 경우는 전자파 내성으로서 각종 외부에서 기기 내부로 침입하는 전자기적 에너지에 의하여 기기가 오작동하지 않는 능력을 평가하는 것을 말하며 이 것들을 총칭하여 전자파 적합성(EMC, Electromagnetic Compatibility)라고 정의한다. (중략)

• 한국정보통신설비학회:학술대회논문집
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• 2007.08a
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• pp.211-214
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• 2007

Development of IT and electronics industries has make our life more convenient, yet at the cost of radio communication noise, malfunctioning of electronic appliance and risks against human health all resulting from EMI. Many states are tightening their EMI (Electro Magnetic Interference) regulations around the world and the EMI regulatory measures are likely to increase in terms of targets and types. Against this backdrop, this paper aims to introduce fundamental and adequate EMI countermeasures encompassing product production cycle from design to production stage.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.56 no.11
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• pp.1988-1991
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• 2007

This study investigates the performances of the signaling techniques including differential signals for the power-distribution network(PDN)s with and without the slit, using a rigorous evaluation method 'Modal Analysis', validated by being compared to the FDTD simulation up to 5 GHz.

• Aerospace Engineering and Technology
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• v.6 no.1
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• pp.173-181
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• 2007

Radiated emission / susceptibility performance of the KSLV-I 2nd stage which are controlled from the unit level to the system level should be examined and managed all over the frequency ranges in order to ensure the normal operation of the SC, the 1st stage of the KSLV-I, ground support equipments which are installed at the space center, and other wireless communication networks. Not only unintentional electric field emissions from the KSLV-I system and its subsystems should be restricted to the levels less than the limits specified in the EMC requirements, but also proper test and evaluation method should be established, respectively. In this paper, radiated emission/susceptibility test limits, method, and test results of the KSLV-I 2nd stage engineering model are presented.

• The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
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• v.6 no.1
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• pp.48-65
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• 1995

This paper deals with the analysis of the unintentional radiation from the TDX-1B subscriber Board. According to the demand of digital systems and developement of high speed switching devices, electro- magnetic noise intensity and it's bandwidth occupancy in spectrum are increasing and so there is a serious possibility causing the various EMI phenomena. More accurate radiation model was established by using the Finite Difference Time Domain (FDTD) analysis, and the EMI probabilistic analysis of the digital switching system was performed. For validating the proposed model and its calculated results, on-promises test was performed and compared with the calculated results. These results may be applicable to be used for EMI model in large digital system, and prediction of EMI effect from a large digital system, and the EMI control design when designing digital system to meet inter- national EMI regulation.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.28 no.5
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• pp.391-399
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• 2017

At present the general trend of modern electronics is toward smaller packages and high performance. As an antenna requires high powers, the EMC(Electromagnetic Compatibility) problems of the transmission line stage is becoming crucial day by day. In this paper, a transmission line excited by the electromagnetic fields from an infinitesimal electric dipole antenna is analyzed using the modified telegrapher's equations. The analytical equations are derived for arbitrarily positioned electric dipole with reference to a transmission line. To verify our approach, the induced voltage and current at the terminal were computed by the proposed approach and compared with those obtained by the electromagnetic simulation solver. Furthermore, the induced currents at the terminal of a transmission line excited by the electric dipoles at various positions were investigated using our approach.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 1995.04a
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• pp.322-327
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• 1995

무기체계 개발에서 개발장비의 내구성은 개발자가 고려해야될 가장 중요한 항목 중에 하나이다. 그러나 이런 개념이 꼭 무기체계 개발에만 국한된다고 생각되지는 않는다. 실제로 여러 선진국에서는 자동차나 항공기 그리고 인공위성에 탑재되는 거의 모든 장비를 환경시험을 통하여 엄격하게 관리하고 있는 것이 사실이고, 우리 기업들 역시 진동을 비롯하여 온도, 충격, EMI/EMC등 환경시험분야에 많은 관심을 기울이고 있기 때문에 이런 환경시험수준 결정절차나 과정 그리고 결과를 나름대로 파악하는 일은 매우 중요하다고 판단된다. 여러 환경시험 중에서도 진동시험은 가장 보편적이고 오래된 것으로 진동시험을 합리적으로 수행하기 위해서는 무엇보다도 합리적이고 타당한 진동시험수준 결정이 필요하다. 미 군사규격도 Sinusoidal이나 Swept Sine에서 Random Vibration 시험까지 여러 종류의 시험에서 각각에 맞는 시험 방법을 제시하고 있으나 이를 뒷받침하는 이론적 설명은 부족한 편이다. 이런 상황에서 프랑스가 환경시험, 특히 진동 시험에 많은 연구를 하고 있어서 이번에 국방과학연구소가 프랑스의 Thomson-CSF사와 함께 일하면서 배우고 나름대로 연구한 것을 앞장에 언급하였다. 세부적인 내용이 많이 포함되지는 못했지만 가능하면 여러 분야에서 이런 작업이나 연구에 관하여 많은 관심을 가져 주기를 바란다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.10 no.2
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• pp.250-256
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• 2006

The revision of radio waves act, which took effect on July 1,2005, widened the bandwidth of PLC from $9kHz{\sim}450kHz$ to $9kHz{\sim}30MHz$. This high upper limit of frequency may cause the interference in HF wireless communications. From this point of view, the goal of this research is to suggest the estimation method of whether-or-not the interference occurs and furthermore offer countermeasures to avoid it hereafter. Ministry of Information and Communication Radio Research Laboratory(MIC-RRL)has been researching for the interference and devoting themselves to turn out how much it affects to HF wireless communications since the revision took effect. This research suggests some estimation methods with receivers, signal generators, or SINAD(Signal to Noise and Distortion) Meter which is so suitable for the RF environment that we can overcome the existing limit to the EMC environment. In addition, this research is focused on securing the environment for wireless communications by establishing the safety zone or suggesting the ways to prohibit the use of the bandwidth, which may cause serious interference, in order to minimize the effect of PLC on HF maritime mobile telecommunications.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.26 no.7
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• pp.636-645
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• 2015

In this paper, unusual harmonics noise problem of digital electronic products in mass production was introduced and a practical solution was proposed. Generally, 5th or higher harmonics noise level has been ignored in circuit designs because over 5th harmonics noise decreases by 40 (dB/decade). Through some measurements, it is confirmed that over 10th harmonics noise can propagate and radiate in case of a certain PCB or housing conditions. We propose a capacitively loaded micro-strip low pass filter for commercial products having spatial design constraints and measured the effectiveness. The proposed structure can solve both of the continual increment of harmonics noise level and the spatial design constraint of commercial products. We expect the proposed method be effectively used for various digital electronic products.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.5 no.6
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• pp.1045-1049
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• 2001

Wireless LANs in the 2.4 ㎓ ISM- band create a new Electromagnetic Compatibility (EMC) problem. We investigated the interference characteristics between such wireless LANs in the case of identical systems, systems with different technical parameters for modulation and demodulation, and using a Gaussian noise source as a disturbance source. Experimental results show that higher throughput is obtained when adjacent wireless LANs use different systems, and that interference characteristics can be evaluated experimentally using a Gaussian noise source. Calculated BER characteristics for the interference agree with experimental measurements, indicating that this calculation method can be used for the design of the wireless LAN network to avoid interference. It is possible to construct an efficient wireless LAN network by combining different wireless LAN systems.