• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2011년도 추계 학술논문 발표대회
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• pp.243-244
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• 2011

In general, magnetite or barite (density: more than 4.0ton/㎥) has been used in concrete for radiation shielding, and radiation tests have been performed to evaluate shielding performance. However, researchers have not studied concrete for radiation shielding that utilizes electric arc furnace oxidizing slag. This research aims to utilize electric arc furnace oxidizing slag which depends on reclamation as environment-friendly concrete materials by using coarse and fine aggregates of electric arc furnace slag containing 30% ferrous metal and with a density of around 3.0~3.8 ton/㎥. Accordingly, this research has judged that the high density electric arc furnace oxidizing slag aggregate can be applied to radiation shielding concrete. It has also examined the possibility of developing radiation shielding concrete utilizing electric arc furnace oxidizing slag aggregate by comparing concrete utilizing all fine and coarse aggregate of electric arc furnace oxidizing slag with concrete using magnetite.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2013년도 춘계 학술논문 발표대회
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• pp.35-36
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• 2013

Electric arc furnace oxidizing slag from massively produced steel slag has been used in road bases and subbases, hot mix asphalt, and landfill. Electric arc furnace oxidizing slag contains iron (15%~30%) and has a high density of 3.0~3.7 ton/m3. Depending on the type and amount of concrete aggregates, the radiation-shielding characteristics can vary. Therefore, aggregates of electric arc furnace oxidizing slag can be considered for the production of radiation-shielding concrete. The experimental design of this study is experiments on Compressive strength experiments, X-ray irradiation experiments, and experiments related to the unit volume weight were carried out on hardened concrete. This experiment compared the performance evaluation of radiation shielding of concrete using electric arc furnace oxidizing slag.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2020년도 봄 학술논문 발표대회
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• pp.177-178
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• 2020

The EMP slip rate was compared with the general concrete using the electric arc furnace slag as an aggregate. Experimental results show that the shielding rate of concrete specimens using electric arc furnace slag increases. It is considered that the shielding rate is increased due to the high Fe content in the components of the electric arc furnace slag aggregate.

• 한국정보통신학회논문지
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• 제15권8호
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• pp.1647-1652
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• 2011

본 논문에서는 IEC 61000-2-9의 HEMP 파형이 무한 도체평판의 개구에 입사할 때, 개구로 침투하는 침투 전자파의 전계 차폐효과를 검토하기 위해 개구면 전계분포에 관한 적분 방정식을 유도하고, 그 해를 모멘트 법으로 구하여 전계 차폐효과를 계산하였다. 도체평판 개구의 길이와 폭의 변화에 따른 차폐효과를 검토한 결과, 개구의 폭이 0.4 ~ 0.45${\lambda}$ 부근에서 전계 차폐효과가 급격히 나빠짐을 확인할 수 있었다. 또한 IEC 61000-2-9와 Bell Labs의 HEMP 입사 파형에 대한 침투 전자파의 크기는 서로 다르지만 전계 차폐효과의 주파수 특성은 양자가 같아짐을 확인할 수 있었다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 제40회 하계학술대회
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• pp.280_281
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• 2009

The past 3 years study on the lightning faults data shows that the main reason is shielding failure rather than back flashover. Accordingly, we need to thoroughly consider about shielding failure angle of tower. Also, transmission line damage caused by shielding can be minimized if we avoid the steep slope area as a transmission line route.

• 한국건설순환자원학회논문집
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• 제9권4호
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• pp.514-520
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• 2021

본 연구에서는 건설현장에서 가장 많이 사용되는 재료 중 콘크리트에 EMP차폐 성능을 부여하기 위해 전기로 산화슬래그를 사용하여 EMP차폐 성능 평가를 실시하였다. 평가 결과 전기로산화슬래그의 성분은 Fe₂O₃ 함량 34%로 나타났으며 MgO 성분 또한 4.8%가량 포함하는 것으로 나타났다. 또한 MgO 성분으로 인한 팽창우려로 골재안정성 평가를 실시한 결과 KS기준에 적합한 것으로 사료된다. EMP 차폐성능 평가결가 압축강도에 따른 EMP차폐성능은 상관성이 없었으며 일반골재는 EMP차폐가 되지 않은 것으로 나타났다. 그러나 전기로산화슬래그를 사용한 골재는 EMP 차폐성능이 우수 했으며 두께가 증가할수록 차폐성능은 향상되는 것을 알 수 있었다. 내구성 평가결과 EMP 차폐 콘크리트는 일반 콘크리트와 유산한 내구성을 보유하는 것으로 나타났다. 이를 통해 향후 EMP차폐 구조물 구축시 전기로 산화슬래그를 사용하여 콘크리트를 제조한다면 차폐율 향상에 좋을 것으로 사료된다.

• 전기학회논문지
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• 제63권6호
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• pp.770-775
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• 2014

According to ICNIRP guidelines for limiting exposure to time-varying electric, magnetic and electromagnetic fields up to 300GHz, magnetic flux density which range from 3Hz to 150kHz are regulated to lower than $6.25{\mu}T$. In order to comply with its standard, OLEV(On-Line Electric Vehicle) have been designed considering EMF(Electro-Magnetic Field) reduction. However, if a current flowing in power line would be bigger for increasing power transfer efficiency, the established shield system no longer acts their role properly. In this paper, therefore, FCCL(Flexible Copper Clad Laminate) is applied to power line and pick-up devices to solve the problems. Though, the FCCL is normally utilized to insulator on circuit board, because of its high heat resistance characteristic, flexibility and thin properties, it makes effectiveness in the shielding device as well. 4 types of FCCL shielding structure are introduced to power line and pick-up devices. From the results, the FCCL which are placed in proposed positions shows maximum EMF reduction compared to the established shielding structure. Henceforth, if OLEV is applied FCCL shielding structure in practice, it will not only be more safe but also step forward to commercialization near future.

• Journal of Ceramic Processing Research
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• 제20권4호
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• pp.363-371
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• 2019

In this study, physical properties of normal concrete, magnetite concrete, EAF concrete, and EAF concrete with added iron powder were evaluated and a feasibility of radiation shielding is also evaluated through irradiation tests against X-rays and gamma-rays. While the unit weight of EAF concrete (3.21 t/㎥) appeared lower than that of magnetite concrete (3.50 t/㎥), the results in compressive strength of EAF concrete were greater than those in magnetite and normal concrete. While the radiation transmission rate of normal concrete reaches 26.0% in the X-ray irradiation test, only 6.0% and 9.0% of transmission rate were observed in magnetite concrete and linear relationship with unit volume weight and radiation shielding. In the gamma-ray irradiation test, the performance of EAF and magnetite concretes appeared to be similar. Through the results on the excellent physical properties and radiation shielding performance a potential applicability of EAF concrete to radiation shielding was verified.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2019년도 춘계 학술논문 발표대회
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• pp.170-171
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• 2019

The EMP slip rate was compared with the general concrete using the electric arc furnace slag as an aggregate. Experimental results show that the shielding rate of concrete specimens using electric arc furnace slag increases. It is considered that the shielding rate is increased due to the high Fe content in the components of the electric arc furnace slag aggregate.

• 전기전자학회논문지
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• 제23권3호
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• pp.756-761
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• 2019

본 논문에서는 기존 4H-SiC SJ UMOSFET 구조의 p-pillar을 기존 UMOSFET의 shielding 영역 아래로 배치시키는 SC-SJ(Shielding Connected-Super Junction) UMOSFET 구조를 제안한다. 제안한 SC-SJ UMOSFET의 경우 p-pillar와 shielding 영역이 공존하여 산화막에서 전계에 의한 항복이 발생하지 않도록 하며, 이는 pillar의 도핑 농도 상승을 가능하게 한다. 결과적으로 온저항을 낮춤으로서 소자의 정적 특성을 개선한다. Sentaurus TCAD 시뮬레이션을 통해 기존 구조와 제안한 구조의 정적 특성을 비교, 분석하였다. 제안한 SC-SJ UMOSFET은 기존 구조에 비해 항복전압의 변화 없이 50% 감소된 온저항을 얻을 수 있다.