해수중 우라늄 회수를 위한 Acrylamidoxime섬유의 합성과 특성

주혁종,주재오 忠南大學校 産業技術硏究所 1988 산업기술연구논문집 Vol.3 No.2

A fibrous adsorbent containing amidoxime groups for the recovery of uranium from seawater was synthesized through the amidoximation of polyacrylonitrile fiber with hydroxylamine. The infrared spectra of the fiber showed the characteristic absorption peaks of amidoxime, i.e. -OH stretching at 3200∼3400㎝-¹, =C=N- stretching of the hydroxylimino group at 1650㎝-¹and =N-O- stretching of hydroxyimino group at 930㎝-¹. Amidoxime groups containing in the fibrous adsorbent determined by elemental analysis were 2.8 meq/g-Ad. Uranyl ions were not adsorbed on the amidoxime fiber from acidic solution below pH 2. However, when PH of the solution increased to over 3, uranyl ions were adsorbed. The increased in temperature and flow rate of seawater in the adsorption process were effective in increasing the amount of adsorbed uranium. The minimum immersion time to obtain equilibrium desorption in 1N-H₂SO₄is estimated to be 30 min. The concentration factors for uranium and transition metal were in the order of 10, while those for alkali metals and akaline earth metals were in the order of 10∼10¹.

혐기성 변성 아크릴계 접착제의 제조 및 접착 특성

주혁종,오인석,권호길,최돈묵 忠南大學校 産業技術硏究所 1991 산업기술연구논문집 Vol.6 No.2

An experimental study was performed to prepare the anaerobic acrylic adhesives with TEGDMA(Trietylene Glycol Dimethacrylate), acrylic acid, p-benzoquinnone and CTBN(Carboxyl Terminated Butadiene Nitrile) To characterize the anaerobic modifided acrylic adhesives, tensile shear adhesion strength, DSC, FT-IR, water resistance, chemicals resistance and oil resistance of adhesives were tested. The results obtained in this study could be summerized as follows; 1. Tensile adhesion shear strength was increased with increasing the adding amounts of p-benzoquinone up to 75kgf/㎠ when 0.163wt% added. 2. After a water resistance test for 72hrs, tensile shear adhension strength maintenance was dominant(about 72%) in the C-3 as compared with the others and alkaline solution resistance of adhesives was excellent on the whole as compare to acid solution. 3. The gasoline, light oil resistance of adhesives were very good enough that could be used in the field of mechanical connecting parts.

4-Vinylpyridine과 p-Divinylbenzene의 共重合과 그 共重合體의 性質에 關한 硏究

周赫鍾 충남대학교 공업교육연구소 1981 論文集 Vol.4 No.1

Synthesis and characterization of the copolymer of 4-vinylpyridine with p-divinylbenzene and the terpolymer of 4-vinylpyridine-divinylbenzene-cinnamic acid lead to the following results ; 1. The compositional analysis of the copolymer proved that the copolymerization equation had to be derived by assuming little effect of the concentration of the suspended vinyl group of p-divinylbenzene in polymerization process. 2. The monomer reactivity ratios, r_1 and r_2, calculated from the Fineman-Ross equation were 1.48 and 0.63, respectively. 3. The activation energy of the copolymerization was 22.9㎉/㏖. 4. The copolymerization reaction was carried out as the first oder reaction. 5. The copolymer was stable at 280℃ but degradation started above the temperature. The degradation showed the first oder reaction at the temperature of 462-520℃. 6. Quarternization of the terpolymer of 4-vinylpyridine-divinylbenzene-cinnamic acid made it a good amphoteric ion exchanger and the cations and anionic exchanging abilities were 7.6 and 6.4meg/g, respectively.

2D-C/C-composites의 제조와 기계적 물성

주혁종,최돈묵 忠南大學校 産業技術硏究所 1989 산업기술연구논문집 Vol.4 No.1

The purpose of this paper is to fabricate the 2D-C/C-composites with various angles and to examine their mechanical properties. The following results can be drawn from the experiment ; 1) When 2D-C/C-composites carbonized up to 1000℃, the unidirectional sample was shrinked about 20% and the others were shrinked slightly. Meanwhile the density of 2D-C/C-composite was decreased with increasing the laminating angle expect the unidirectional composite (0°/0°) 2) After five times impregnation and carbonization the density did not increased due to the block formation. 3) Flexual strength, flexual modulus and impact strength were increased with increasing the fiber volume fraction. But flexual strength and modulus were decreased above 65% fiber volume fraction, also impact strength was decreased above 68% fiber volume fraction. 4) The value of flexual strength, modulus and impact strength were dominent in the unidirectional sample as compared with the different laminating angle.

Boric Acid로 함침된 C/C-Composit의 산화 특성에 관한 연구

김덕주,정두환,주혁종 충남대학교 공업교육연구소 1986 論文集 Vol.8 No.3

The purpose of this paper is to enhance oxidation resistance and physical strength of the C/C composites by impregnation with Broic acid. The green C/C-composites were treated at 200℃, 600℃, 800℃ and 1000℃ after 5 times impregnation with Boric acid. The results were as follow. 1) Chemical and physical bonding were observed after impregnation with Boric acid and heat treatment 2) The oxidation resistance of C/C-composites were incresed by treating preheated treatment temperature. 3) It was observed that density and inter-laminar shear strength incresed after treating Broic acid impregnation and preheated treatment temperature.

자궁내막암 환자에서 복강경하 자궁적출술과 복식 자궁적출술의 비교 연구

김종혁,이상수,김천복,김대연,김용만,김영탁,목정은,남주현 대한부인종양 콜포스코피학회 2003 Journal of Gynecologic Oncology Vol.14 No.4

목적 : 자궁내막암 환자에서 시행된 복강경 수술의 임상적 결과를 평가하고 수술적 지표 및 재발률에 대하여 기존의 개복 수술과 비교하고자 하였다. 연구 방법 : 1997년 8월부터 2003년 11월까지 저자들은 임상적 병기 I기인 79명의 자궁내막암 환자에서 복강경하 자궁적출술과 골반 및 부대동맥 림프절 절제술을 시행하였다. 총 79명의 환자 중, 수술적 병기 I기와 II기로 판명된 74명의 환자를 연구 대상으로 하였다. 대조군으로는 같은 기간 동안에 개복수술을 시행한 환자중 복강경 수술군과 병기가 같은 168예를 선정하였다. 결과 : 평균 수술 기간, 수혈량은 양군에서 비슷하였으며, 평균 재원 기간은 복강경 수술군에서 유의하게 짧았다. 수술전후 및 만성 합병증의 발생은 개복 수술군에서 유의하게 증가되었으며, 획득한 림프절의 수는 복강경 수술군에서 유의하게 더 많았다. 복강경 수술군에서 1예, 개복 수술군에서는 2예에서 재발하였고, 2년 무병 생존률은 복강경 수술군과 개복 수술군에서 각각 97.5%와 98.6%으로 유의한 차이는 관찰되지 않았다. 결론 : 자궁내막암 치료로서 복강경 수술은 기존의 개복술을 대신할 수 있는 안전하고 효과적인 시술 방법이다. 개복 수술과 비교해 볼 때, 재발 및 생존율 면에서 차이가 없었지만, 향후 전향적이고 더 오랜 추적기간을 갖는 연구가 필요하다고 사료된다. Objective : To evaluate the outcomes of laparoscopic surgery and to compare surgical parameters and recurrence rate of these with those of conventional abdominal surgery in patients with endometrial cancer. Methods : From August 1997 to November 2003, we have performed 79 cases of LAVH (laparoscopically assisted vaginal hysterectomy) with or without lymph node dissection. Laparoscopic approach was adapted in patients with FIGO clinical stage I by imaging study. Of the 79 patients, 74 patients who were proved to be surgical stage I and II were enrolled in this comparative study. As a control group, We selected 168 cases for the laparotomy group of the same stages. Results : The mean duration of surgery, the amount of blood transfusion and hemoglobin chamges were similar in both the laparoscory and the convertional alparotomy group. The mean duration of hospital stay was significantly shorter in patients treated by laparoscopic surgery (10.2 vs. 15.5 days). The number of lymph node obtained was significantly higher in the laparoscopy group. Two year recurrence-free survival rates were 97.5% in laparoscopy group and 98.6% in laparotomy group (p=0.763). Conclusion : Laparoscopic surgery for the treatment of early stage endometrial cancer is safe and effective altematives in terms of perioperative complications. Overall and recurrence-free survival did not differ significantly in both groups however long term risk for recurrence and survival has yet to be defined.

핏치를 Matrix-precursor로 한 탄소/탄소 복합체의 성질

이보성,주혁종,정발 忠南大學校 産業技術硏究所 1986 산업기술연구논문집 Vol.1 No.1

Using aluminum chloride and copper chloride as a catalyst, coal tar pitches were heat treated and converted into pitch containing more aromatic hydrocarbons. The pitches were used as a matrix precursor for carbon/carbon composite. As a result, a composite after first carbonization up to 1000℃ was shown 4-7% of volume contration. The contration was improved compared with that of resin matrix precursor. In order to increase the density of composite, the composite was imptegnated and recarbonized 4 times with molten pitch and increased up to 1.72g/㎤. The composite based coal tar pitch was shown in higher modulus than the composite based with resin.

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℃.

고온 Binder로서 Vinylchloride-Vinylacetate 공중합 수지의 특성

이보성,주혁종 충남대학교 공업교육연구소 1983 論文集 Vol.6 No.2(B)

Vinylchloride-vinylacetate copolymer was analyzed with thermogravimetric analyzer, and as a result of this analysis, temperature profile for oxidation and carbonization was drawn up. Graphite, the copolymer and some additives were blent with solvent and extruded in order to prepare a sample. In this study, 3 effects on bending strength are examined: 1) amount of binder, 2) temperature of oxidation, 3) temperature of carbonization. When sample is treated up to 270℃ for 11 hours for oxidation and up to 1150℃ for 3 hours for carbonization, the bending strength of the sample reached to 3.8 × 10 gf/㎟.

Polyacrylonitrile 공중합체 섬유의 산화

이보성,주혁종 충남대학교 공업교육연구소 1984 論文集 Vol.7 No.2

From the oxidative thermal analysis of PAN-Methylacrylate copolymer fibre following results were obtained. 1) The cyclization of naphthyridine was taken place with this copolymer fibre instead of formation of carbon-carbon double bond under the temperature of 180℃. 2) Polymerization of C = N was begun above 180℃. 3) This copolymer fibre should be oxidized more than 2hrs at 22℃ in order to produce PANOX or CF, or it would be difficult to form the ladder-polymer structure under 220℃. 4) At above 240℃, the oxidation time would be much shortened, while the strength of CF would be decreased with abscission of polymer back-bone.