Nano sized FeAl intermetallic particles were successfully synthesized by plasma arc discharge pro-cess. The synthesized powders shouted core-shell structures with the particle size of 10-20 nm. The core was metallic FeAl and shell was composed of amorphous Because of the difference of Fe and Al vapor pressure during synthesis, the Al contents in the nanoparticles depended on the Al contents of master alloy.

Iron-carbon nanocapsules were synthesized by plasma arc discharge (PAD) process under various atmosphere of methane, argon and hydrogen gas. Characterization and surface properties were investigated by means of HRTEM, XRD, XPS and Mossbauer spectroscopy. Fe nanocapsules synthesized were composed of three phases with core/shell structures. The surface of nanocapsules was covered by the shell of graphite phase in the thickness of nm.

Monodispersed flaky silver powder was obtained by controlling the ratios of and Agin in a mixed solution of ethylene glycol and ammonia with an addition of PVP. The effects of on its morphology and size were investigated. In molar ratio was found to be an important reaction factor for the nucleation and crystal growth of Ag powder. The synthesis of flaky powder was optimized at over 6 of molar ratio increased, the size of precipitates was increased regardless of the amount of Pt. In the absence of , the morphology and size of reduced Ag powder were found to be irregular in shape in diameter. However, homogenized fine Ag powder was obtained due to heterogeneous nucleation when used as a cat-alyst, and flaky one was synthesized with the addition of Pt over of Pt/Ag.

Although the structure of carbon nanotubes is important factor characterizing its properties, it is very difficult to control the structure of carbon nanotubes (MWNTs) and to predict the range of their diameter, which is the primary factor of MWNTs' physical properties. We tried to control the diameter of MWNTsby governing the feed injection temperature of floating catalyst method. The structure of MWNTs was influenced by the phase change of ferrocene fed as the catalyst,. The carbon nanotubes were very narrow at injection temperatures close to the sublimation pt. of ferrocene, in which most MWNTs had diameters in the range of 20~30 nm. At injection temperatures between the boiling pt. and melting pt. of ferrocene, the diameters became larger and had broad distribution. However, at injection temperatures higher than the boiling pt., the diameters became narrow again and had very uniform distribution.

본 연구는 여성노인에 의한 범죄는 여성노인의 빈곤한 상황과 관련이 있을 것으로 예측하였다. 이러한 가정을 가지고 본 연구는 여성노인들의 사회경제적 상황이 법태도의 형성에 어떠한 영향을 미치는지를 살펴보고자 하였다. 빈곤에 의해 형성된 부정적인 법태도는 범죄행위를 유발할 수 있는 위험요인이될 수 있기 때문이다. 조사는 60세 이상 여성노인을 대상으로 하였는데, 계층을 고려한 층화표출(stratified sampling) 방법으로 수집된 자료 중 433부를 분석대상으로 하였다. 여성노인들의 사회경제적 요인들은 “학력”, “직업”, “용돈조달방법”, “용돈의 양”, “가구형태”, “배우자의 사망여부”이다. 한편 법태도는 “법차별성에 대한 인식”과 “법준수태도”로 구성되어 있다. 조사결과, 사회경제적 상황이 안정적인 여성노인들일수록 법적용의 차별성에 대한 태도와 법준수태도 모두 긍정적인 태도를 보이는 것으로 나타났다. 경제적으로 비교적 안정적인 여성노인들은 경제적으로 불안정한 여성노인들에 비하여 법이 차별적이지 않다고 생각하고 있으며 법에 대한 준수태도도 강한 경향을 보였다. 반면에 빈곤한 여성노인들일수록 법태도가 부정적이어서 법이 차별적으로 적용되고 있다고 생각하고, 법을 준수해야 한다는 태도도 약한 경향이 있는 것으로 나타났다. 여성노인의 범죄행위에 대한 빈곤의 효과를 탐색한 본 연구의 결과가 시사하는 바는 다음과 같다. 첫째, 범죄통제정책은 사람들의 법태도에 영향을 주는 요인이 무엇인지에 대한 이해가 바탕이 되어야 한다는 점이다. 구체적으로 여성노인에 대한 범죄통제에 있어 사회경제적으로 소외되어 있는 여성노인 계층의 규범의 형성에 특별히 관심을 가져야 할 것으로 사료된다. 둘째, 여성노인범죄를 예방하는 정책은 보호적 관점에 입각하여 접근해야 한다는 점이다. 남녀가 불평등한 사회에서 경제적인 소외로 인한 여성노인들의 빈곤은 범죄의 원인으로 작용할 수 있다. 따라서 자립능력이 없는 여성노인들의 경제적안정을 보장할 수 있도록 사회적지원을 강화하는 것을 통하여 여성노인의 빈곤문제를 해결하는 것이 여성노인에 의한 범죄예방에 중요할 것으로 보인다.

Multi-walled carbon nanotubes (CNTs) were prepared by thermal chemical vapor deposition (CVD) and microwave plasma chemical vapor deposition (MPCVD) using various combination of binary catalysts with four transition metals such as Fe, Co, Cu, and Ni. In the preparation of CNTs from acetylene precursor by thermal CVD, the CNTs with very high yield of 43.6 % was produced over Fe-Co/Al2O3. The highest yield of CNTs was obtained with the catalyst reduced for 3 hr and the yield was decreased with increasing reduction time to 5 hr, due to the formation of FeAl2O4 metal-aluminate. On the other hand, the CNTs prepared by acethylene plasma CVD had more straight, smaller diameter, and larger aspect ratio(L/D) than those prepared by thermal CVD, although their yield had lower value of 27.7%. The degree of graphitization of CNTs measured by Id/Ig value and thermal degradation temperature were 1.04 and 602℃, respectively.

An aqueous solution of a commercial liquid synthetic detergent for kitchen use was photodecomposed in the presence of titanium dioxides powder under an atmosphere of air at room temperature. Titanium dioxides were prepared by sol-gel method from titanium iso-propoxide at different R ratio(H2O/titanium iso-propoxide) and calcined at 500℃. All titanium dioxides were characterized by XRD, BET surface area analyzer and UV-VIS spectrometer. The surface area of titanium dioxides prepared at R ratio=6 appeared higher volume about 20% than commercial TiO2 catalysts. XRD patterns of titania particles were observed mixing phase together with rutile and anatase type. Titanium dioxides prepared by sol-gel method show higher activity about 6% than commercial TiO2 catalysts on the photocatalytic degradation of a commercial liquid synthetic detergent for kitchen. The concentration of the detergent decreased to about 90% of its initial value at illumination times of 2 hour. Illumination for 30 minutes decreased the concentration of oxygen to about one-fifth of the initial value.

풍향풍속계와 구조 모니터링 시스템을 설치하여 강풍과 거물의 동적 특성을 계측하였다. 계측건물은 속초의 산기슭에 위치하고 있다. 감쇠율과 고유진동수의 진폭 의존성을 분석하였다. 감쇠율의 진폭의존성은 9%로서, 가속도진폭이 증가함에 따라서 감쇠율이 명료하게 증가하는 경향을 보였다. 계측데이터에서 얻은 동적 특성의 경향은 사용성 평가시 건물의 동적 특성을 평가하는데 유용하게 사용되리라 기대된다.

In the capacity spectrum method (CSM), the peak response of an inelastic system under a given earthquake load is estimated transforming the system into the equivalent elastic one. This paper presented estimating the peak inelastic response is evaIuated by the CSM. The equivalent period and damping are calculated using the ATC-40, Gülkan, Kowalsky, and Iwan methods, and the performance points are obtained according the procedure B of ATC-40. Analysis results indicate that the ATC-40 method generaIly underestimates the peak response, while the Gülkan and Kowalsky methods overestimate the responses. The Iwan method produces the values between those by the ATC-40 method and the Gülkan and Kowalsky methods, and estimates the reponses relatively closer to the exact ones. Further, it is found that the Kowalsky method gives the negative equivalent damping ratios depending on the hardening ratios, and thereby can not be used to estimate the responses in some cases.