• Journal of the Korean Mathematical Society
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• v.52 no.3
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• pp.649-661
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• 2015

Insertion-of-factors-property, which was introduced by Bell, has a role in the study of various sorts of zero-divisors in noncommutative rings. We in this note consider this property in the case that factors are restricted to maximal ideals. A ring is called IMIP when it satisfies such property. It is shown that the Dorroh extension of A by K is an IMIP ring if and only if A is an IFP ring without identity, where A is a nil algebra over a field K. The structure of an IMIP ring is studied in relation to various kinds of rings which have roles in noncommutative ring theory.

• Proceedings of the KIEE Conference
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• 2002.07b
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• pp.715-719
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• 2002

Recently, Dangers due to harmonics emanated from all sorts of machinery have been on the increase with the development in industry. One of them is that Zero Sequence harmonic currents flow from the neutral wires in 3 phases - 4 wire systems. The flowing of harmonic currents in neutral wires brings about the superheating and falloff in output of transformer, the overheating of them, a rise in ground potential and the wrong movement of machinery, so has a bad influence on this system. To develop the machinery to decrease neutral wires Zero sequence harmonic currents and apply it help solve these problems and bring about the effects of a improvement in power factor and energy savings.

• Journal of Technologic Dentistry
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• v.10 no.1
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• pp.43-46
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• 1988

The purpose of this investigation was to determined the dimensional change of plaster to time with impression materials. This study was carried out through the literature & experiment, using 4sorts of the Impression Materials(Alginate, Impression Agar, Silicone Rubber, Polysulfide Rybber)and 5 treatments(1hr, 11/2 hrs, 2hur, 3hur, 6hur). The results of this experiment were as follows : 1. Main effect of Impression Meterials & tretments was statistically significant.(P<0.01). 2. The effect of 2-way interaction of Impression materials & Treatments was also statistically significant.(P<0.01) 3. Though this study was the difference of degree according to the materials. All Impression Materials were tended to be constained according to over the time.

• Journal of the Korean Society of Industry Convergence
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• v.4 no.1
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• pp.71-75
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• 2001

This study investigates the relationship between size of cosmetic shops, size of showcases, sorts and arrangement of light source, floor plan, and illuminance measured of interior space. From this result, the average space size of cosmetic shops were $623.2{\times}512.9{\times}258.1cm$(width, length, height), the average space size of showcases were $273.3{\times}53.8{\times}89.5cm$ (width, depth, height). The light source was most frequently used fluorescent lamp, and illuminance was the most highest nearby main showcase, and average illuminance were 722[Ix], uniformity were 0.3.

• Journal of the Korean Chemical Society
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• v.13 no.2
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• pp.171-175
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• 1969

This study wa attempted to extract the Potash-Ammonia Fertilyzer in most satisfactory yield from the Uncalcinecl Domestic Alunite ore applying an optimal reaction conditions (Ammonia water concentration and applicable reaction pressure, etc.), it was found that almost all amount of $K_2SO_4$ was extracted in the forms of $K_2SO_4·(NH_4)_2SO_4$mixture under such conditions. The experimental data to note are as follows: 1. The optimal pressure applied to the reaction was 600 to 700 Psig. 2. The optimal concentration of Ammonia water was 7 Mol/L. 3. The reaction time needed was 3 hours. 4. The extraction rate and degree were not at variance with sorts and occurrences of Alunite ore.

• Journal of Korean Academy of Nursing
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• v.10 no.2
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• pp.13-20
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• 1980

This present study was undertaken to assess the effect of sterilization of the thermometer with three sorts of disinfectant sponges-0.1 % bichloride of mercury sponge 70% alcohol sponge, 0.5% zephiran chloride sponge,- by bacterial culture methods in 10 admitted adult patients in S. Hospital, Mok Po city. The results obtained were as follows ; 1. The thermometer sterilized with 0.1 ％ bichloride of mercury sponge showed no growth of bacteria organism in 5 cases but showed growth of pathogenic organism in 1 case and non pathogenic organism in 4 cases. 2. The thermomerer sterilized with 70 ％ alcohol sponge showed no growth of bacteria organism in 8 cases but showed growth of nonpathogenic organism in 2 cases. 3. The themometer sterilized with 0.5 ％ zephiran chloride sponge showed no growth of bacteria organism in all 10 cases. From these results it could be concluded that 0.5 ％ zephiran chloride would be most effective in sterilization of thermometer.

• Transactions of the Korean Society of Automotive Engineers
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• v.6 no.3
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• pp.161-168
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• 1998

This paper presents the on-vehicle information system that displays the states of the vehicle in brief words instead of symbols. Main functions of this system include a system check function, trip function, warning function, and clock function. With this system, a driver can obtain all sorts of useful information related to various conditions of the vehicle, and if any problem arises in the vehicle, he can recognize it by the displayed words with a warning sound. Also, this system is very helpful for safety driving because it displays whatever a driver wants to have concerning trip information. By experimental test and driving test, the development system shows good results for each function.

• Journal of the Korean Ceramic Society
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• v.35 no.9
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• pp.958-968
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• 1998

Porous silica ceramics were prepared using DCCA(Drying Control Chemical Additives) Such as uncharged polymer(Polyethylene glycol) and protein (Lipase) under H2O/Low-grade TEOS=10 C2H5OH/Low-grade TEOS=1 HC1/Low=grade TEOS=0.01 After Plain which doesn't added DCCA and samples of 11 sorts which varied molecular weight of PEG(Mw=600, 1000, 2000) quantity of Lipase and concentration of wat-er were synthesized gellation time and thermal analysis were investigated. After heat-treated at 600, cry-stal structures analyses of SiO2 polymer and characteristics of pores were investigated. Gellation time was retarded about 2-6 times as compared with plain resulting in addition of DCCA and crystal structures ex-hibited amorphous state. Moreover as increase of water a short gellation time was obtained. The samples added PEG showed increase of specific surface areas up to 20-40% and had micropores while those of Lipase were decreased about 90% and showed broad pore size distribution.

• Journal of the Korean housing association
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• v.10 no.1
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• pp.63-73
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• 1999

The purpose of this study is to provide new design techniques for designers to design energy saving balcony in the apartment house using solar energy passively. These design techniques are examined with some samples of foreign buildings used solar energy passively. To classify these design techniques, this study sorts out the energy saving design elements from the preliminary studies. The results of this study show how to apply each design technique to the design of balcony in the apartment house and present a classification table of these techniques. Finally, this study suggests a design solution which can be applied in the design of balcony in existing apartment house.

• The Journal of Korean Medical History
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• v.20 no.1
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• pp.139-164
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• 2007

Xu Ling Tai (徐靈胎) was an outstanding medical practitioner in the early and middle part of the Cheong Dynasty of China (淸代). He had learned the study of Confucian classics and natural science from his childhood and read through books covering all sorts of fields, from medical science to hydraulics and literature. He was, in particular, one of leaders who represented the school of classicism that followed scriptures (尊經復古主義學派) in the field of medical science and his solid abstraction has had an affect on posterity's one. One of his masterpieces is Yi Xue Yuan Liu Lun (醫學源流論) among his books in the medical area.