γ-Fe_2O_3 의 製造 및 磁氣特性

金澤基,周赫鍾 충남대학교 공업기술개발연구소 1976 工業技術開發硏究所論文集 Vol.3 No.1

In case of the γ-Fe_2O_3 preparation, pH of the Fe(OH)_2 solution and oxidation temperature of the FeO(OH) which was influenced on the magnetic properties of the γ-Fe_2O_3 has been investigated. The magnetic properties of these samples were measured with self-made magnetic hysteresis loop tracer. The formation of compound γ-Fe_2O_3 has been confirmed by X-ray diffraction. It was obtained that the preparing conditions of γ-Fe_2O_3 were about pH 10 of Fe(OH)_2 solution and oxidation temperature 300℃ of FeO(OH). The purity of this sample was obtained about 95%. The saturation magnetization(Ms) and the coecive force (Hc) are found to be varied with pH and oxidation temperature, and the maximum value of Ms, 68 emu/gr, and of Hc, 140 Oe, are obtained at pH 10 and oxidation temperature 300℃.

Ziegler-Natta 폐촉매외 Bauxite에서 Alumina의 抽出

김종택,김명철,윤주식 경북대학교 산업기술연구소 1987 産業技術硏究誌 Vol.14 No.-

Alumina extraction technique was developed by treating Bauxite and waste Ziegler-Natta catalyst with 3N~10 N NaOH Solution. Reaction times from 2hrs to 24hrs were compared with the amount of alumina recovered after CO_2 gas neutralization. About 50% of alumina were extracted out from the samples by treating 6~7 N NaOH for 10 hours. This low concentrated NaOH solution technique was very effective for little quantity production of alumina with relatively simple reaction facilities. And this method was definately good for the better recovery of NaOH, and for the raw material such as waste Ziegler-Natta Catalyst.

Charnley 股關節全置術後의 局所負荷의 減少에 對한 硏究

金鍾宅 全南大醫大 1977 전남의대학술지 Vol.14 No.2

Silica 및 고체시료의 적외선 스펙트럼을 위한 Silicon Wafer 기술

金淙澤,金明哲 慶北大學校 1984 論文集 Vol.38 No.-

The silicon wafer is chemically stable below 800℃and not significantly oxidized below the temperature to be penetrable to the beam of infrared. The infrared absorption bands of silica were observed at 1090㎝^-1 (band1), 805㎝^-1(band2), 470㎝^-1(band3). The band 1 and 2 were assigned to the asymmetric and symmetric stretching vibration, and the band 3 was assigned to the Si-O bending vibration of SiO_2 The Si-O absorption bands on the infrared spectra were shifted to higher frequency according to the increase of oxygen ratio in the silica. The silicon wafer technique for the gas adsorption studies had advantage on getting sharper absorption of the brittle mineral samples, the water soluble polymer samples, and the efflorescent samples which were unable to be self-supported. Besides, this technique was effectively applicable to the samples such as copper sulfate which easily react with KBr.

陽이온 交換된 天然제올라이트의 CO氣體 吸着性質

金淙澤,朴斗善 경북대학교 공과대학 1985 工大硏究誌 Vol.14 No.-

The infrared spectra of cation exchanged natural zeolites were obtained and the adsorption isotherms of CO gas adsorbed on those samples were obtained. The adsorptions of CO gas on the Na^+ cation exchanged samples took place considerably more than on the other cations exchanged ones. The relative adsorption capacities of CO gas were in decreasing order of Ni^2+>Co^2+>Cu^2+. This tendency was related to the polarizing power of exchanged cations.

국산 흑연의 熱的성질과 결정성

金俊榮,金淙澤 경북대학교 산업기술연구소 1987 産業技術硏究誌 Vol.15 No.-

The crystallinity and the thermal property of four graphites produced in Korea were studied by x-ray and DT/TGA. The sample OR exhibited to be most well graphitized crystal whereas the TH and GA were relatively well crystallized. The amorphous graphite SW had shown little crystallinity by x-ray diffractogram. DTA and TGA study of these graphite show significant difference in ignition temperature and heat of combustion according to the crystallinity.

실리콘 겔에 활성화된 복강 대식세포의 interleukin-6 및 tumor necrosis factor-α에 의한 섬유모세포 중식 자극

김환묵,한상배,이백권,이종원,한기택,천지훈 大韓成形外科學會 1998 Archives of Plastic Surgery Vol.25 No.5

Silicone gel breast implants may induce local(fibrous capsular contracture) or systemic(rheumatoid arthritis, systemic sclerosis, etc) complications. The exact mechanism of fibrous capsular contracture has not been fully understood. In the present study, we tried to find out the effect of silicone gel on the fibroblast proliferation which has been known as a major contributing factor in fibrous capsular contracture formation. In vitro, activated macrophages are known to secrete monokines which affect fibroblast proliferation and collagen synthesis. And tumour necrosis factor-α(TNF-α) and interleukin-6(IL-6), which were released by macrophages, were reported as potent stimulator of fibroblast proliferation. The goal of this study is to investigate the role of macrophages and tumour necrosis factor-αor interleukin-6 in the interaction of fibroblasts and silicone gel. We designed four groups, two experimental and two control, using Institute for Cancer Research(ICR) mouse peritioneal macrophage and silicone gel. For the preparation of the conditioned medium of macrophages, peritoneal macrophages were prepared and cultured for 24 hours on the silicone gel-coated and naked (not coated) surface [silicone gel-macrophage conditioned medium(SCM; experimental group) and normal polystyrene-macrophage conditioned medium(NCM; control group) respectively]. To correct the effect of 10% fetal bovine serum which was included in Rapid Prototyping and Manufacturing Institute (RPMI) 1640 medium and draw the effect only by macrophages, the RPMI 1640 medium with 10% fetal bovine serum was cultured by the same method on the silicone gel-coated and naked surface (silicone gel-macrophage free conditioned medium; SFM and normal polystyrene-macrophage free conditioned medium; NFM respectively). Each conditioned medium was added onto NIH 3T3 fibroblasts culture at a final 25% concentration of total culture medium and followed by the cultivation for 24 hours. For antibody neutralizing experiments, each conditioned medium was preincubated with polyclonal rabbit anti-mouse TNF-α antibody or polyclonal rat anti-mouse IL-6 antibody for 1 hour and then, conditioned medium with antibody was added to the culture medium of NIH 3T3 fibroblasts by the same method. After 24 hours cultivation, total number of viable fibroblast(cell growth), DNA synthesis and collagen synthesis of fibroblasts with each medium were measured by sulforhodamine B(SRB) assay, 3H-thymidine and 3H-proline incorporation respectively. The results were as follows: 1. In the experiment about the effect of the conditioned medium on the fibroblast activity, the experimental group(SCM), compared with the control group(NCM), showed a significant increase of the cell growth (p<0.01), a significant decrease of DNA synthesis(p<0.001), but no significant difference in the collagen synthesis. 2. In the experiment about the effect of polyclonal rabbit anti-mouse TNF-α antibody on the fibroblast activity, after the addition of antibody the experimental group, compared with the control group, showed a significant decrease of the cell growth(p<0.001), a significant increase of DNA synthesis(p<0.01), but no significant difference in the collagen syn thesis. 3. In the experiment about the effect of polyclonal rat anti-mouse IL-6 antibody on the fibroblast activity, after the addition of antibody the experimental group, compared with the control group, showed a significant decrease of the cell growth(p<0.001), a significant increase of DNA synthesis(p<0.0001), but no significant difference in the collagen synthesis. In conclusion, culture supernatants (conditioned medium) of peritoneal macrophages, activated by silicone gel, stimulate the NIH 3T3 fibroblast proliferation. TNF-α and IL-6, products of macrophage, are involved in the stimulation of NIH 3T3 fibroblast proliferation in an in vitro condition.

한국 남자 중·고등학교 체력검사를 위한 준거지향기준 설정

김종택 師範大學 體育硏究所 1999 서울大學校 體育硏究所論集 Vol.20 No.1

The purpose of this study was to establish Criterion-Referenced Standards(CRS) of the Korean Youth Fitness Test for the male middle and high school students. The subjects of this study were 50 physical educators and 1,000 male students. CRS were established by using judgemental, empirical, normative, and mixed methods. The results were as follows; 1) CRS by using judgemental method were higher than CRS by using the different methods and judgemental CRS among physical educators were variable which was considered as arbitrary CRS. 2) CRS by using empirical method were lower than CRS by using different methods, and validity indices of empirical criterion were low, too. 3) CRS by using normative method were lower than CRS by using judgemental method and higher than CRS by using empirical method in middle school, and as high as CRS by using judgemental method in high school. 4) Among three national norms of Korea, Japan, and U.S.A., Japan's norms which are very similar to Korea's normas were higher than the U.S.A.'s. The norms based on the Korean youth fitness were similar to the norms of Japan but higher than the norms of U.S.A.. were the lowest, and those of Korea were lower than those of Japan.

동해지방의 천연 Zeolite 의 건조제로서의 흡착특성

김종택,이무섭,박순권,홍상표 경북대학교 산업기술연구소 1988 産業技術硏究誌 Vol.16 No.-

Some selected natural zeolites obtained from Kyungpook coastal area were modified by HCI, NaOH and NH_4OH solutions and exposed to the atmosphere of various vapour pressure within the desiccator. Generally, silica gel exhibited as good moisture adsorbent at high humidity and as poor adsorbent at low humid atmosphere. However, moisture adsorption capacities of mordenite such as Na^+-K_111, NH_4^+-K_111, Na^+-Y_11 exceeded the silica gel at the lower moisture pressure than 16 torr. NH_4^+-MOrdenite proved itself to be best adsorbent in the closed system whose moisture pressure diminished as the time eclipsed. This system was most closely simulated to the working conditions of those commercial dryer in the package.

電子線으로 照射된 低密度 Polyethylene의 電氣電導度와 溫度特性

李宗珪,金永銓,金澤基 충남대학교 자연과학연구소 1984 忠南科學硏究誌 Vol.11 No.1

Conductivity in polyethylene has been investigated as the applied electric fields between 1.1×10 exp (4) and 2.5×10 exp (5)V/㎝ and temperature from 20℃ to 105℃. The comparative analysis of the theory with the experiment results were tried on the assumption that the current is composed of electrons injected into sample which contains space charge over the Schottky barrier. From the results a rough estimate was made of the density of traps in irradiated polyethylene and the activation energy, which could be calculated from the temperature dependence of electrical conductivities of polyethylene irradiated with 10^8rad electron beam, were obtained 0.28eV and 1.06eV.