To investigate characterization of EMF(Electromagnetic Field) emission from VDT(Visual Display Terminal) in computer room, we were divided into 3 types of placement monitors which are 1) back side of monitor faced the ground(back view type), 2) arrangement of monitors was a line type(two sides type), and 3) disposition of monitors was s straight(horizontal line type). We also measured monitors classified types at the front, side and back by distance and evaluated by TCO(The Swedish Confederation of profession Employers) and MPR-2(Measure and Proof Radiation Board) guide line. Magnetic field emission level by the type of VDT, it was indicated that MF(Magnetic Field) level was below the backgrounds level when CRT moved away about 70~90cm, LCD moved away about 40~50cm. We evaluated MF emission level by the number of VDT, it did not show any relationship. Finally, estimated MF emission level by the placement of VDT, it was showed the MF level less than the background level, when VDT moved away 40~50cm in all dispositions with exception of 2 sites. Background level of case was higher than emitted from VDT, so that did not effect on MF level by distance. However, we find out that as distance increased, MF emission level decreased significantly in all cases. We measured MF emission level of one monitor and others (back and forth) monitor in line type. Below the background level when one monitor type moved away 70cm, others monitor type moved away 40cm. However, other monitor types affected MF level which is located back monitor. The data demonstrate that avoiding excessive MF exposure from VDT using computer room, to have a space between user and VDT at least 50㎝.

전자파 자기장 발생 장치를 개발하여 제작한 후, 이를 수경재배와 배지경의 양액 공급관에 장착하여 물에 자기장을 쬔 자화수 처리의 유무에 따른 수질 성분변화, 배추와 상추의 생장량 변화, 그리고 성분 변화를 분석하였다. 자화수 처리구는 무처리구에 비해 비타민 C 함량이 상추 2.8배, 배추 1.2배로 더 많았다. 또한 자화수 처리에 의한 생장촉진 효과는 상추의 수경과 배지경 재배에서 현저히 나타났으나 배추의 토경재배는 자화수 처리의 효과가 미미하였다. 따라서 토경재배 상추에서 자화수 처리에 의해 생장과 비타민의 함량을 높일 수 있을 것으로 기대된다.

The mechanical properties of ceramics materials can be tailored by designing their microstructures. We have reported that development of texture can be controlled by slip casting in a strong magnetic field followed by heating even for diamagnetic ceramics such as alumina. A strong magnetic field of 12T was applied to the suspension indcuding alumina powder to rotate each particle during slip casting. The sintering was conducted at the desired temperature in air without a magnetic field. C-axis of alumina was parallel to the magnetic field. Bending strength of textured alumina depended on the direction of oriented microstructure.

This work will report a highly textured β-Si3N4 ceramic by aqueous slip casting in a magnetic field and subsequent pressureless sintering, Effects of the sintering aids, polymer dispersant, pH and stirring time on the stability of the Si3N4 slurries were studied. The textured β-Si3N4 with 97 % relative density could be obtained by slip casting in a magnetic field of 12 T and subsequent sintering at 1800 oC for 1 h. The textured microstructure is featured by the alignment of c-axis of β-Si3N4 crystals perpendicular to the magnetic field, and the Lotgering orientation factor, f, is determined to be 0.8.

The relationship between electrical properties of superconductor and externally applied magnetic field was studied to develop a magnetic field sensor. The electrical resistance of the superconductor was increased by applying external magnetic field and even after removal of the magnetic field. This behavior was related to the magnetic flux trapped in the superconductor, which penetrated through the material by the external magnetic field. Some portion of the superconductor was changed to a normal state by the trapped magnetic flux. The appearance of the normal state yielded to enhance the electrical resistance.

We have demonstrated that textured nanocomposites can be fabricated by slip casting followed by partial oxidation. reaction sintering of mixed suspensions of and SiC powders in a high magnetic field. The sintered density was changed by the degree of oxidation at 1200C and 1300C. The degree of orientation of alumina in the nanocomposite was examined on the basis of the X-ray diffraction patterns and scanning electron micrographs. It is confirmed that aluminaoriented nanocomposites were fabricated. The three-point bending strength at room temperature was observed for the nanocomposites.

We have demonstrated that textured nanocomposites can be fabricated by slip casting followed by partial oxidation - reaction sintering of mixed suspensions of and SiC powders in a high magnetic field. The sintered density was changed by the degree of oxidation at 1200C and 1300C. The degree of orientation of alumina in the nanocomposite was examined on the basis of the X-ray diffraction patterns and scanning electron micrographs. It is confirmed that alumina-oriented nanocomposites were fabricated. The three-point bending strength at room temperature was observed for the nanocomposites.