• Journal of the Korea Institute of Military Science and Technology
• /
• v.8 no.1 s.20
• /
• pp.56-61
• /
• 2005

A novel method for telemetering flight operational data of airborne jammer to ground station is presented. The design and construction of an onboard telemetry transmitting set and a ground receiving set which are necessary for realizing this novel method is described. Using this novel method, ALQ-X, airborne jammer, can immediately transmit the gathered data during flight without additional exclusive telemetry set.

• Korean Journal of Crystallography
• /
• v.9 no.2
• /
• pp.120-124
• /
• 1998

N-tert-Butyl-2-(1-acetoxy-2-fluoro-1-butyl)benzenesulfonamide의 분자 및 결정구조를 X-선회절법으로 연구하였다. 결정의 공간군은 P21/c이고, 단위포 상수는 a=8.583(2) , b=14.674(2) , c=14.703(2) , β=103.23(1)0, Z=4, V=1802.6(5) 3, Dc=1.27 Mgm-3이다. 회절반점들의 세기는 Rigaku AFC-5 Diffractometer로 얻었으며, graphite로 단색화한 Cu-KαX-선을 사용하였다. 분자구조는 직접법으로 풀었으며 최소자승법으로 정밀화하였다. 최종신뢰도 R값은 2472개의 회절반점에 대하여 0.069였다. 분자 내에 N(7)과 O(4)사이에 1개의 수소결합[2.990(4) ]을 갖으며, C(14)와 C(15)는 반대배열을 갖고 있다. 분자간 가장 인접한 거리는 3.465(5) [C(19) O(5)] (symmetry code: -x, y+1/2, -z+1/2)로 분자간 접촉은 van der Waals 힘에 의해 결합되어 있다.

• Proceedings of the Korean Society For Composite Materials Conference
• /
• 2004.04a
• /
• pp.131-134
• /
• 2004

The object of this study is to design the Radar Absorbing Structures (RAS) having sandwich structures in the X-band $(8.2\~12.4GHz)$ frequencies. Glass fabric/epoxy composites containing conductive carbon blacks and carbon fabric/epoxy composites were used for the face sheets. Polyurethane (PU) foams containing multi­walled carbon nanotube (MWNT) were used for the core. Their permittivities in the X-band were measured using the transmission line technique. The reflection loss characteristics for multi-layered sandwich structures were calculated using the theory of transmission and reflection in a multi-layered medium. Three kinds of specimens were fabricated and their reflection losses in the X-band were measured using the free space technique. Experimental results were in good agreements with simulated ones in 10dB absorbing bandwidth.

• Proceedings of the International Microelectronics And Packaging Society Conference
• /
• 2002.05a
• /
• pp.165-168
• /
• 2002

본 연구에서는 칩인덕터 코어 소재로 사용되는 (NiCuZn)-ferrite를 습식합성법을 이용하여 나노크기의 초미세 분말을 합성하였으며, 합성된 (ZiCuZn)-ferrite 의 제조공정 및 전파기적 특성에 관하여 고찰하였다. 조성은 (N $i_{0.4-x}$C $u_{x}$Z $n_{0.6}$)$_{1+w}$ (F $e_2$ $O_4$)$_{1-w}$에서 x의 값을 0.05~0.25 범위로 변화시켰으며, w 값은 0.03으로 고정하였다. 소결은 8$50^{\circ}C$에서 9$50^{\circ}C$의 범위에서 진행하였다. 나노크기의(NiCuZn)-ferrite를 사용함으로서 시약급 원료로 제조된 것보다 소결온도를 낮출 수 있었고, 밀도가 높은 페라이트 소결체를 얻을 수 있었다. 또한 초투자율, 품질계수 등 전자기적 특성이 우수하게 나타났다. 그 밖에 습식합성법으로 합성한 (NiCuZn)-ferrite 의 결정성, 미세구조 등을 XRD, SEM 을 이용하여 고찰하였다.하였다.다.

• The Korean Journal of Zoology
• /
• v.10 no.1
• /
• pp.27-34
• /
• 1967

SM 계 자성 마우스를 대조군과 실험군으로 나누어,대조군에는 0.9% 생리식염수를 , 실험군에는 methylene blue(110 mg/kg, 식염수에 용해, pH 7.0)를 각각 피하주사하고, 40 분, 6 시간 또는 24시간후에 양군을 다같이 120 r X-선으로 일시 전신조사하였다. 조사후 21 시간에 걸쳐 albumin-globulin 비, 전혈청단백질 , 그리고 체중에 대한 간 및 신장중량비를 측정하여 조사전 처리시핵에 따른 methylene blue 의 방어효과를 조사하였다. 일반적으로 양군에서 조사후 일구간에 따라 2개의 변화가 나타났으며, 첫째는 1 일구에 , 둘째 상은 8 일구에 나타났다. methylene blue 처리는 이 두 개 상 일구에서 albumin -globulin 비의 증가성, 전혈청단백질 및 간장중량의 감소성에 대하여 큰 지체성을 나타냈다. 조사전 40 분 처리군에서 특히 현저한 방어작용이 있었으나 6 시간 및 24 시간전 처리구에서는 별 영향이 없었다.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2006.06a
• /
• pp.159-160
• /
• 2006

$AgGaSe_2$ single crystal thin films grown by using hot wall epitaxy (HWE) system. The single crystal thin films were investigated by photoluminescence and double crystal X-ray diffraction(DCXD) measurement. From the photoluminescence measurement of $AgGaSe_2$ single crystal thin film, we observed free excition ($E_x$) observable only in high quality crystal and neutral bound exciton ($D^{\circ}$,X) having very strong peak intensity. And, the full width at hall maximum and binding energy of neutral donor bound excition were 8 meV and 14.1 meV, respectively. By Haynes rule, an activation energy of impurity was 141 meV.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
• /
• v.4 no.1
• /
• pp.37-42
• /
• 1986

This paper deals with comparison of simultaneous geodetic networks between with geographical coordinates and with plane coordinates. The adjustment computation is performed by variation of coordinates. Provisional values for observation equations are computed by extended Guass mid-latitude formula using, official coordinates ($\varphi,\lambda$) in geographical network abjustment, measurements are reduced to plane by origin scale factor (＝1.0000) Bessel ellipsoid and unit weight are adopted, and geographical coordinates are projected by Guass conformal double projection. The processing results of a test-network by distances yield the average root mean square error of position 6ㆍ2cm for adjustment with $\varphi,\lambda$ and 5.8cm for adjustment with X, Y. RMSE of discrepancy between two methods is 1.7cm. This result conform to required accracy.

• Journal of Radiation Industry
• /
• v.8 no.2
• /
• pp.83-88
• /
• 2014

Application of X-ray irradiation of dried condiments was studied using commercially prepared dried garlic, onion and welsh onion flakes as model samples. Total load of aerobic microbes (TAM), color differences, and generation of off-flavor were quantified for samples individually irradiated with gamma rays, electrons, or X-rays. TAM load was decreased by irradiation in a dose-dependent manner. The three types of radiation did not differ in the extent of TAM reduction (P>0.05). The samples did not differ in color. Off-flavor was detected from 6 kGy-irradiated samples, regardless of radiation sources. The results indicated that X-ray irradiation could be used for irradiation of dried condiments with the same effects as gamma rays and an electron beam.

• Bulletin of the Korean Chemical Society
• /
• v.16 no.6
• /
• pp.504-507
• /
• 1995

The reaction of Co2(CO)8 with 3,6-di-tert-butyl-1,2-benzoquinone in the presence of the respective 4,4'-chalcogenobispyridine results in the coordination polymers of [CoⅢ(4,4'-X(Py)2)(DBSQ)(DBCat)]n (X=S, Se, Te; Py=pyridine; DBSQ=3,6-di-tert-butylsemiquinone; DBCat=3,6-di-tert-butylcatechol). The title compounds undergo an intramolecular Cat → Co electron transfer, and thus change toward the [CoⅡ(4,4'-X(Py)2)(DBSQ)2]n at elevated temperature. The temperature-switching properties of the compounds directly depend upon the electronegativity of the chalcogen atom of the 4,4'-chalcogenobispyridine coligands. The spectroscopic data disclose that the properties of [CoⅢ(4,4'-S(Py)2)(DBSQ)(DBCat)]n and [CoⅢ(4,4'-Se(Py)2)(DBSQ)(DBCat)]n are similar each other in contrast to those of [CoⅢ(4,4'-Te(Py)2)(DBSQ)(DBCat)]n.

• Journal of the Korean Magnetics Society
• /
• v.5 no.5
• /
• pp.491-495
• /
• 1995

The crystallization behaviors and magnetic properties for $Fe_{81-x}Al_{4}B_{10}Zr_{5}Cu_{x}$ (x=0, 1, 2 at%) alloys is investigated. By the addition of 1~2 Cu, the temperature range, where a single bcc phase exists, expands largely over 200 K and the grain size of bcc phase represents to less than 10 nm. For the optimally annealed Cu-added alloys, the high $\mu_{e}$ (1 kHz) above 20000 combined with the high $B_{10}$ of about 1.4 T is obtained in nanocrystalline state. The low core loss of 95.8 W/kg at 0.1 T and 100 kHz is confirmed for the nanocrystalline $Fe_{80}Al_{4}B_{10}Zr_{5}Cu_{1}$ alloy.