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김원일,왕덕현,이윤경,이재만,신경오 경남대학교 신소재연구소 1997 論文集 Vol.9 No.-
다방향 적층구조 중합체 목합재료의 드릴가공시 발생하는 적층분리 현상에 대해서 절삭속도 및 이송속도의 변화시키면서 실험적 연구를 진행하였다. 드릴가공시 발생되는 재료거동의 탄성파의 변형을 시편의 측면에서 음향방출신호로 측정하였으며, 광학현미경과 전자현미경으로 적층분리된 측정값과 표면거칠기 측정에서 얻은 결과를 얻어 비교하였다. 음향방출 신호로 측정한 결과와 공구현미경의 실제측정값 및 표면거칠기에서 적층분리가 발생한 지점이 거의 일치함을 확인하였다. 본 실험결과 드릴공구로 사용된 소결합금 공구는 이송속도가 낮고 절삭속도를 큰 경우 적층분리 현상을 억제하여 양호한 가공면을 얻을 수 있었다. An experimental study on the delamination phenomena during drilling of laminate polymer composites, was conducted according t o the change of cutting speed and feed rate. The analysis of acoustic emission signals was in good agreement with measured values by optical microscopy. And also the surface roughness characteristics of workpiece in drilling was accumulated and compared. It was found that the delamination location measured by AE signals and real measurement values by tool microscope are almost same. The better surface and prevention of delamination was obtained by the slight increase of cutting speed and the decrease of feed rate when sintered tool was used.
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응집과 고도산화공정을 이용한 난분해성 유기물 제거 특성
李元鎬,柳洪悳,閔庚國 충주대학교 산업과학기술연구소 2002 産業科學論文集 Vol.10 No.-
In this research, study about removal of non-biodegradable organic matter using coagulation and AOP precesses was conducted. Samples of this study are concentrated wastewater produced in membrane process treating swine wastewater. In first research, study of coagulation process before advance oxidation process was conducted. For the coagulation process, aluminum sulfate(Alum) and ferric chloride(FeCl_3) were used as coagulants. Optimum reaction conditions of alum are pH 6 and coagulant dosage 1500 mg/L. Otherwise, optimum reaction conditions of ferric chloride are pH 4 and coagulant dosage 500 mg/L. In second research, removal efficiency of organic matter using advanced oxidation process under the pH and coagulants dosage being adjusted to optimum conditions in first research was conducted. Optimum condition for removal efficiency of organic matter is pH 6 in fenton oxidation process. At this time, removal efficiency of TCOD_Cr and UV-254 are 77 and 88%, respectively. Removal efficiency of these process than coagulation using alum or ferric chloride is increased about 14%. Removal efficiency of organic matter treated by UV/H_2O_2 and ozone(O_3) after alum coagulation process is very high in alkaline condition among pH 2, 6 and 12. Removal efficiencies of TCOD_Cr in fenton, alum/O_3 and alum/UV/H_2O_2 processes are 77, 74 and 69%, respectively. Therefore, removal efficiency of organic matter treated by in fenton is very high. Removal efficiency of organic matter between TCOD_Cr and UV-254 is different from equal sample. Because measurement of UV-254 is interfered with color and particle in swine wastewater itself. Therefore, measurement of organic matter is desirable value of TCOD_Cr than UV-254
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홍원표,양현수,강 용,강덕원 忠南大學校 産業技術硏究所 1988 산업기술연구논문집 Vol.3 No.1
With the growing need of the country's electrical energy from nuclear power generation, the technical importance on the load following has been widely recognized. The load following is being executed by two modes, Boron Regeneration System(BRS) and Boron Thermal Regeneration System(BTRS). Especially, the function of BTRS is solely relied on the efficient use of Boration/dilution in strongly basic resin bed. Therefore, the most influential factors to be investigated in load following operation is to determine the effect of boron concentration in burn-up reactivity and to find the way how to improve the BTRS in order for reusing all the reactor cooling water contaminated by radioactive wastes. This study is mainly devoted to the following purposes : (1) Evaluation of operation data in nuclear power plant about the relation of burn-up reactivity and boron dilution/ boration in BTRS. (2) Diagnostic suggestion on the solving problems in operation of Demineralizer(exchange resin bed).
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물유리의 acethyl화에 의한 silicone 고분자의 합성
김원덕 三陟大學校 1994 論文集 Vol.27 No.-
값이 싸고 자원이 풍부한 물유리에 H₂SO₄를 작용시켜 silicic acid를 조제하고 이것을 tetrahydrofuran(THF)로 추출한 후 다시 dioxane으로 재추출하였다. 추출된 silicic acid/dioxane은 acethylchloride로 반응시켜 아세틸화 규산을 합성하고 아세틸화규산은 trimetylchlorosilane과 반응시켜 trimetylpolysiloxane인 silicone polymer 합성하였다. 합성된 아세틸화규산과 silicone polymer는 I.R, NMR등으로 반응을 확인하였으며 이들 모두는 생성 당시 불안정하여 곧 가교되어 불용성으로 변하였다. silicone polymer는 THF, dioxane, acetone등에는 가용이나 bengene, hexane, CCl₄등에는 불용이며 분자량 약 3000, 융점 약 140℃인 잭색과립상의 polymer임을 알았다. Synthesis of polysiloxane by silylation of silicic acid with acethylchloride derived from industrial water glass has been investigated. The reaction consists of five steps : preparation of silicic acid from waterglass, extraction of silicic acid by THF, preparation of silicic acid/dioxane, acethylation of silicic acid /dioxine, and silylation of acethylated silicic acid. The silylating agents, and white amorphous granule with 3000 molecular weight, and the melting point 140℃, were soluble in THF, dixone, and acetone.
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김원덕,김진목 三陟大學校 2003 論文集 Vol.36 No.-
The main goal of this research is develop raw materials of third synthetic materials, which are not friendly materials for environment, to produce functional wood powder composite pellet raw materials. This kind of raw materials used extrusion, injection and molding. the new materials with concentration of pvc/wood powder/yellow-earth in proportions have increasing wood powder ratio according to mechanical intensity increased, and yellow-earth ratio does not change with far infrared ray ejection. The new synthetic resin contains with wood powder removed from environment pollution. The biodegradable polymeric materials development is most important thing for keeping environment in harmony.
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Cu, CuCl, CuCl_2·2H_2O 의 X-線 K 吸收 Spectrum 들과 Cu 의 X-線 K 放出 Spectrum 의 構造
李悳源,程順和 成均館大學校 1983 論文集 Vol.33 No.-
Cu, CuCl, CuCl_2·2H_2O의 X-線 K吸收端 微細構造와 같은 波長領域에서의 Cu의 放出構造를 50㎝인 曲率반경을 갖는 구부러진 SiO_2(石英)結晶과 함께 Cauchois type으로 배열된 single crystal Spectrameter에 의해 사진 건판위에 얻었으며 그 構造들은 recording microphotometer에 의해 eV의 간격에 따른 曲線으로 그려졌고 諸硏究者들에 의한 자료와 비교조사 했다. 그 結果 Cu에 대한 Cu화합물의 K吸收端 微細構造의 變位를 測定했으며 그 領域에서의 放出構造와의 비교에서 K吸收端의 energy 位置가 Kβ_2 line의 位置와 거의 一致함을 확인했고 諸硏究者들에 의한 實驗 및 理論値와 비교 검토하였다. The K-absorption spectra of Cu, CuCl, CuCl_2·2H_2O were photographed by the single bented crystal Spectrometer which was arranged to the cauchois type. The K-emission spectrum of Cu were photographed too. The extended finestructures of Cu were compared with the previously reported theoretical and experimental values. The diflerence of the Cu K-absorption fine Structures of Cu in the pure Cu metal and Cu compounds were measured. The shift was found on the short wavelength side from K-absorption edge of Cu (non Compound). The Kβ_2 emission line was compared with the K-absorption edge.
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