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신현수(H.-S. Shin),전흥재(H.-J. Chun),최흥섭(H. S. Choi) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.3
There are many practical situations where electromagnetic waves interact with composite materials. The knowledge of interaction of electromagnetic waves in composite structures is important for designing the shielding structure for antenna such as radome. Recently, radomes are constructed in the form of foam core sandwich structures that have many mechanical advantages such as high strength, long fatigue life, low density and adaptability to the intended function of structure. However, the propagation of electromagnetic waves is affected by high anisotropic permeability and loss tangent of the composite skin. Even though many investigations were focused on the propagation of electromagnetic waves through composite materials in the 2D plane in last several decades, little investigations were carried out to understand adequately the propagation of the electromagnetic waves as function of incident angle in the foam core sandwich structures. In this paper, the analytical 3D model and method to predict the propagation of electromagnetic waves through the foam core sandwich structures were proposed.
망간산화물 La0.7Ca0.3MnO₃의 거대 자기 엔트로피 효과
신현수(H. S. Shin),주홍렬(H. L. Ju) 한국자기학회 2000 韓國磁氣學會誌 Vol.10 No.4
Large magnetic entropy change in single crystalline and polycrystalline perovskite manganites La_(0.7)Ca_(0.3)MnO₃ has been observed as magnetic field is changed. The large magnetic entropy change is believed to be caused by the abrupt reduction in magnetization as a result of 1st order-like magnetic transition. The large magnetic entropy change and easiness of the Curie temperature manipulation in the temperature range 100 K<T<400 K make the manganite perovskites useful for magnetic refrigerants over a wide temperature range including room temperature.
문성록(S R Moon),이형식(H S Lee),신현수(H S Shin),김귀언(G E Kim),서창옥(C O Suh),노준규(J K Loh),최은창(E C Choi),김광문(K M Kim),홍원표(W P Hong) 대한두경부종양학회 1990 대한두경부 종양학회지 Vol.6 No.1
This is a retrospective analysis of 8 patients with olfactory neuroepithelioma treated by external radiation during 1981-1988. Their age ranged from 13 to 65 years. All of them were male patients. At the time of diagnosis, six patients were classified as Kadish stage C, two were stage B, and none of them were stage A. Six of eight patients treated by external irradiation, only one patient had complete surgical resection followed by postoperative irradiation. Another one patient received one course of induction chemotherapy followed by radical irradiation. Three patients developed local recurrences and five patients had distant metastasis. One patient with stage B disease who had complete surgical resection followed by postoperative irradiation was alived without evidence of disease. Seven of eight patients died of tumor, with a duration of survival ranging from 3 to 106 months.
초대형 부유식 해양구조물의 유탄성 응답에 대한 해석 방법
신현경(H. SHIN),이호영(H. Y. LEE),신현수(H. S. SHIN),박인규(I. K. PARK) 한국해양공학회 2000 韓國海洋工學會誌 Vol.14 No.2
In this paper, hydroelastic responses of a very large floating structure(VlFS) are studied theoretically. We have been developed the source and dipole distribution method and pressure distribution method to evaluate the hydrodynamic pressures. The problem of vertical structural responses due to waves are calculated by using finite element method(FEM) and modal expansion method of a free-free beam. Hydroelastic responses of VLFS in waves are computed by four methods developed in this paper. As a result, the theoretical results of motion responses show good agreements with experimental ones.
페로브스카이트 망간산화물 La₁-xBaxMnO₃(0≤x≤1)의 자기적, 전기적 특성
남윤성(Y. S. Nam),이재은(J. E. Lee),신현수(H. S. Shin),주홍렬(H. L. Ju) 한국자기학회 2000 韓國磁氣學會誌 Vol.10 No.3
We have investigated some crystallographic, magnetic, and transport properties of the first colossal magnetoresistive compounds La_(1-x)Ba_xMnO₃(0≤x≤1) using magnetization (5 K≤T≤360 K, -5 T≤H≤5 T) and resistivity (100 K≤T≤350 K) measurements. La_(1-x)Ba_xMnO₃ were found to be ferromagnetic for all x. The La_(1-x)Ba_xMnO₃ were found to be insulating for x<0.2, metallic for 0.2<x<0.5, and insulating for x>0.5. The magnitude of saturation magnetization (Ms) increased until x=1/8 and had theoretical maximum Ms for 0.13<x<0.5, and Ms decreased with an increase of x for x>0.5. The ferromagnetic transition temperature increased until x=3/8 and had a constant value of 335~340 K for x>3/8. For x≥0.5, the La_(1-x)Ba_xMnO₃ samples showed a percolation-type conduction behavior and enhanced low field magnetoresistance caused by simultaneous occurrence of the chemical/magnetic phase separation.