은 및 망간 산화물에 의한 일산화탄소의 촉매 산화 연구

김덕묵,이종찬 단국대학교 1999 論文集 Vol.34 No.-

This study concerns the catalytic oxidation of carbon monoxide with 26 kinds of Ag-oxide, MnO_2 and their mixtures at room temperature. From the results the following phenomena were obtained. 1. Simple Ag-oxide or MnO_2 samples were not favorable to the oxidation of carbon monoxide. 2. The Ag_2O, AgO and MnO_2 mixtures(10 : 90 or 20 :80) were observed more powerful catalyzer for carbon observed more powerful catalyzer for carbon monoxide oxidation. 3. The oxidized samples of Ag-Mn premixture with several oxidants were also weaker catalyzer than the simple mixtures. 4. The AgMnO_4 and Ag-Mn-Oxides prepared by electroytic oxidation method also acted poorly as the catalytic oxidants. 5. Ag_2O and MnO_2 were not found out the structure change but AgO is changed oxidation state and heat evolved during the treatment. 6. The γ-MnO_2 are more superior catalyzer than the β-MnO_2 for catalytic oxidation of carbon monoxide.

비구개관낭종에 관한 X선학적 연구

전찬덕,이상래,황의환 大韓口腔顎顔面 放射線學會 1993 Imaging Science in Dentistry Vol.23 No.1

The purpose of this study was to evaluate the clinical and radiographic features of 35 cases of nasopalatine duct cyst by means of the analysis of periapical and/or occlusal radiograms in 35 persons visited the Department of Oral and Maxillofacial Radiology, School of Dentistry, Kyung Hee University and Chonbuk National University. The obtained results were as follows: 1. The incidence of nasopalatine duct cysts was higher in males(74.3%) than in females(25.7%). 2. The nasopalatine duct cysts were the most frequently occurred in the 4th decades(34.3%). The 6th and 7th decades(17.1%, 17.1%) were next in order to frequency followed by the 5th decades(14.3%), the 3rd decades(8.6%), the 2nd decades(5.7%), and 8th decades(2.9%). 3. In the signs and symptoms of nasoplatine duct cysts, 25.7% were swelling, 17.1% were swelling and tenderness, 20.0% were swelling and pain, and 37.2% were a symptom. 4. In the shape of nasopalatine duct cysts, 40.0% were round type, 48.6% were oval type, and 11.8% were heart type, In symmetry of the nasopalatine duct cysts to the median palatine surture, 85.7% were symmetry, 14.3% were asymmetry. 5. In the width of nasopalatine duct cysts, 11.4% were 6-10mm, 48.6% were 11-20mm, 25.7% were 21-30mm, and 14.3% were 31-40mm. 6. In the periphery of nasopalatine duct cysts., 82.9% were distinct, 17.1% were relatively distinct. 7. In the change of root, 51.5% were intact, 17.1% were root divergence, 20.0% were root resorption, and 11.4% were root divergence and resorption.

21세기 벤처기업의 활성화 전략 : 벤처기업의 효율적인 정보 활용을 위한 데이터 웨어하우스 모델링 방법

고덕필,전현배,하대용,박찬정,곽세영,김락상 淸州大學校 産業經營硏究所 2000 産業經營硏究 Vol.23 No.1

21세기 벤처기업의 활성화 전략 : 벤처기업의 자본조달방안

고덕필,전현배,하대용,박찬정,곽세영,김락상 淸州大學校 産業經營硏究所 2000 産業經營硏究 Vol.23 No.1

젤라틴에 메틸메타크릴레이트로 유화중합시킨 그라프트 폴리머의 열분해에 관한 연구

설수덕,박찬헌,신은주,왕석주 동아대학교 공과대학 부설 한국자원개발연구소 1994 硏究報告 Vol.18 No.2

Emulsion graft copolymerization with sodium lauryl sulfate(SLS) of methyl methacrylate(MMA) onto gelatin was carried out in aqueous solution by potassium persulfate(KPS) as an initiator and thermal degradation of graft copolymer was stuied using a dynamic and isothermal thermogravimetry in the stream of nitrogen gas with 60㎖/min at various heating rate from 4 to 20℃/min, and various time at 200℃ The optimun concentration on emulsion graft copolymerization of KPS, gelatin, MMA, reaction temperature and time were 12×10^(-4)㏖/ℓ, 6g, 6.3×10^(-1)㏖/ℓ, 65℃ and 4hours, respectively. The activation energy of polymerization was 17.8 ㎉/㏖. The range of activation energies of decomposition obtained using Friedman's method was between49~57 ㎉/㏖ and using Ozawa's method was between 44~52㎉/㏖. The thermal degradation of gelatin-g-PMMA is likely due to decomposition of PMMA branches dominantely.

산란계 사료첨가제로서 크릴분말의 효과

김종덕,장재익,유문일,정흥우,권찬호,오두식,김창현 한국국제농업개발학회 2004 韓國國際農業開發學會誌 Vol.16 No.1

본 시험은 크릴 분말의 사료적 특성을 조사하고, 산란계 사료에 첨가하였을 때 계란의 생산성과 품질을 비교하기 위하여 수해하였다. 크릴 분말을 산란계 사료에 0, 1 및 2% 수준으로 첨가하여 216수에 6주간 사양시험을 실시하였다. 크릴분말의 일반성분은 수분 8.25%, 조단백질 50.52%, 조지방 16.67%, 조회분 15.72%로 단백질과 지방이 높은 동물성 사료원료였다. 그리고 무기질(15.72%), astaxanthin (10ppm) 및 콜레스테롤 함량 (780ppm) 또한 많았다. 산란율, 연파란율, 일일사료섭취량 및 난중은 처리간에 유의적인 차이가 없었다. 황고 및 난황색도는 크릴의 첨가수준이 높을수록 유의적으로 높아 산란계의 난질을 향상시키는 첨가제로서의 가능성을 보였다. 이상의 결과를 볼 때 크릴 분말은 단백질과 지방이 높은 동물성 사료이며, 산란계에서 천연착색제로의 가능성을 보였다. This experiment was conducted to evaluate the chemical composition of Antarctic Krill(Euphausia superba Dana) meal as feed, and to investigate the effect of its supplementation on productivity and egg quality of laying hen. A total of 216 layers at the age 43 weeks in commercial cage were fed for 6 weeks with 3 different diets containing 0, 1, and 2% Krill meal (KM). The chemical composition of KM was consisted of moisture 8.25%, crude protein 50.52%, crude fat 16.67%, curde ash 15.72%, indicating that KM contains large amount of protein and fat. Krill meal also contains large amounts of mineral(15.72%), astaxanthin(10ppm) and cholesterol(780ppm). No differences were found in egg production, broken and soft eggs, and feed intake among treatments. Dietary supplementation of KM resulted in increased egg yolk height(6.1㎜) and yolk color (2) compared with those of control, suggesting that KM can be used as a feed additive for yolk quality improvement. According to the results of this study, Krill meal can be supplemented in laying hen diets as protein and fat sources, and natural coloring pigment.

수상관의 밝기 및 해상도를 고려한 기준 백색 설정

최덕규,한찬호,정영헌 경운대학교 산업기술연구소 2001 産業技術硏究論文誌 Vol.3 No.2(C)

Reference white in color television receiver can be achieved by adjusting the RGB gun current ratio and it is necessary to provide additional gain ratio adjustment for the RGB video signal. Generally, the gun current density profile has a Gaussian distribution and the gain-bandwith product of RGB channel amplifier is constant. Therefore brightness and spatial resolution are changed with variations in reference white of receiver. In this paper, the effect of RGB gun current and channel gain ratios on brightness and resolution of CPT is analyzed. Brightness is increased with the color temperature of reference white because of Holmholtz-Kohlrausch effect. The change in light output is more abrupt and spatial resolution is improved with unity current ratio. For more bright and improved resolution we also present the range of color temperature of reference white for P22 phosphors.

선착효과 및 반사음을 이용한 스테레오 음상확대

한찬호,최덕규 경운대학교 산업기술연구소 2000 産業技術硏究論文誌 Vol.3 No.1(B)

In the AV system, to produce a realistic sound effect is very difficult because the distance between stereo speakers is very narrow. Many signal processing method of widening the sound image for spatial impression have been studied. Most of the typical methods of widening the sound image are related to the phase shifting. but this method was not effective in the concrete wall structure with high reflectivity. In this paper, we proposed an effective method of extending stereo sound image using Precedence Effect and reflected sound. In experiments we confirm the usefulness of the method for extending stereo sound image of a conventional AV system in wider listening area of a room.

銀 활성탄소의 오존분해능에 관한 연구

李鍾蔡,金德默 단국대학교 대학원 1988 學術論叢 Vol.12 No.-

Silver impregnated active carbon (SIAC) is amorphous and its intraparticle pores are well developed. It has high adsorption capacity and catalytic adsorption effect for Ozone gas and air polutants. We are concerned the following results. 1. SIAC have a powerful adsorption capacity for Ozone gas in physical and catalytic chemi-sorption effects, but its capacities are proportional to impregnated Silver amounts. 2. The oxidation state of Silver and its IR-spectrum after treated through Ozone are compared with original samples. 3. Ozone decomposition capacity of SIAC are about half of commercial Ozone decomposition catalyzer. 4. Reuseability of SIAC with thermal process will be physical capacity only available.

靑綠色 燐酸바륨顔科의 製造와 物性

金燦國,薛秀德 동아대학교 공과대학 부설 한국자원개발연구소 1979 硏究報告 Vol.4 No.1

Ba(CH)₂·8H₂O, (NH₄)₂HPO₄ 및 MnO₂간의 混合比를 任意로 變化시킨 試料를 電氣爐에 넣고 하燒溫度를 變化시켜 Ba₃(PO₄)₂를 製造하는 實驗이다. 混合比 3:1:2:1.2의 試料를 800℃에서 3時間 가량 하燒시켜 본 結果, 90% 以上의 收得率을 가진 靑綠色의 α-Ba₃(PO₄)₂가 生成되었다. A study on the formation of Ba₃(PO₄)₂ was carried in different sample that change mole ratio of Ba(OH)₂·8H₂O, (N₄)₂HPO₄, MnO₂ and changed their calcined temperature in an electric muffle furnace. When sample thus mixed mole ratio 3.1.2.1.2 was calcined at a temperature range 800℃ for 3 hours, 90% and over calcined material was recovered in the form of α-Ba₃(PO₄)₂ with a greenish blue colour.