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      • KCI등재

        EC-MBR 공정의 MLSS, 전류밀도 및 접촉시간이 막 오염 감소에 미치는 영향 모델링

        김완규,장인성 대한상하수도학회 2019 상하수도학회지 Vol.33 No.2

        Electro-coagulation process has been gained an attention recently because it could overcome the membrane fouling problems in MBR. Effect of the key operational parameters in electro-coagulation, current density(ρi) and contact time(t) on membrane fouling reduction was investigated in this study. A kinetic model for ρi and t required to reduce the membrane fouling was suggested under different MLSS(mixed liquor suspended solids) concentration. Total 48 batch type experiments of electro-coagulations under different sets of current densities(2.5, 6, 12 and 24 A/m2), contact times(0, 2, 6 and 12 hr) and MLSS concentration(4500, 6500 and 8500mg/L) were carried out. After each electro-coagulation under different conditions, a series of membrane filtration was performed to get information on how much of membrane fouling was reduced. The membrane fouling decreased as the ρi and t increased but as MLSS decreased. Total fouling resistances, Rt (=Rc+Rf) were calculated and compared to those of the controls (Ro), which were obtained from the experiments without electro-coagulation. A kinetic approach for the fouling reduction rate (Rt/Ro) was carried out and three equations under different MLSS concentration were suggested: i)     (MLSS=4500 mg/L), ii)     (MLSS=6500 mg/L), iii)     (MLSS=8500 mg/L). These equations state that the product of ρi and t needed to reduce the fouling in certain amounts (in this study, 10% of fouling reduction) is always constant.

      • KCI등재
      • KCI등재

        수도균핵병을 일으키는 진균의 형태적 및 배양적 특성

        김완규 한국균학회 1993 韓國菌學會誌 Vol.21 No.1

        Morphological and cultural characteristics of fungi causing rice sclerotial diseases were examined. Hyphal widths of R. solani and R. oryzae were same and ranged 6.0-12.0㎛ with average 9.0㎛, the widest among those of the sclerotial fungi examined. Hyphal width of R. oryzaesativae ranged 6.0-9.0㎛ with average 7.41㎛. Hyphal width of R. cerealis was the narrowest among those of Rhizoctonia species examined, and the same was hyphal width of S. oryzae among those of Sclerotium species. Nuclear staining by HCL-Giemsa method showed that R. solani and R. oryzae had many nuclei within one hyphal cell, S. oryzae one nucleus, and the other sclerotial fungi mostly two nuclei. The nuclear number of R. solani was the largest, which ranged 2-17 with average 6.3. Average size of sclerotic of the sclerotial fungi except S. hydrophilum and S. oryzae produced in lesions ranged 1.0-2.0㎜. Average size of sclerotic of S. hydrophilum and S. oryzae was 0.5㎜ and 0.24㎜, respectively. Sclerotic of R. solani and R. oryzae produced in culture were more variable in size and larger than those produced in lesions. However, the sclerotial sizes of the other sclerotial fungi produced in culture were almost the same as those produced in lesions. Sclerotial colors of sclerotial fungi produced in lesions were similar to those produced in culture, but sclerotial shapes of some sclerotial fungi exhibited somewhat difference between the sclerotic produced in lesions and in culture. Optimum temperature for mycelial growth of R, cerealis was 23℃, and that of the other scterotial fungi ranged from 27 to 33℃. Maximum temperature for mycelial growth of some sclerotial fungi was as high as 41℃, while that of R. cerealis was as low as 31℃. Minimum temperature for mycelial growth of R. cerealis was 2℃, and that of the other sclerotial fungi ranged from 6 to l0℃.

      • SCOPUSKCI등재

        분자진동방법을 사용한 2, 2'-Bipyridyl Crown Ether 의 다른자리 입체성 효과에 관한 연구

        김완규,정순량,Wan Kyu Kim,Soon Ryang Chung 대한화학회 1985 대한화학회지 Vol.29 No.3

        2,2'-bipyridyl crown ether에 관한 allosteric 효과를 분자진동연구방법을 사용하여 연구하였는데, 방법으로는 mass-weighted-cartesian 좌표방법을 사용하였다. Crown ether의 pore opening 운동에 관여하는 모드로는 235, 234, 188 그리고 178cm$^{-1}$에 해당되는 파수가 얻어졌고, biphenyl축을 통한 회전운동이 crown ether에 영향을 미치는 rotational vibration 운동은 168, 104 그리고 67cm$^{-1}$에서 파수가 얻어졌다. 특히 178cm$^{-1}$의 모드는 allosteric효과를 가장 많이 포함한 것으로 생각되어 진다. By using the Mass-Weighted-Cartesian coordinate method, the allosteric effect of 2,2'-bipyridyl crown(4) ether is studied. The vibrational modes of 235, 234, 188, and 178cm$^{-1}$ belong to the pore opening motion of crown ether and those of 168, 104, and 67cm$^{-1}$ belong to the rotational vibration motion of bipyridyl. Especially the mode appearing at 178cm$^{-1}$ shows a large allosteric effect by activation of the allosteric site.

      • KCI등재

        3D 프린팅을 이용한 목가구 삼방연귀(三方燕口) 결구 부자재 개발 연구

        김완규,조성환 커뮤니케이션디자인학회(구 시각디자인학회) 2020 커뮤니케이션 디자인학연구 Vol.73 No.-

        목가구 제작에서 부자재의 활용은 생산성과 편리성에 직접적인 영향을 주며 가구 디자인의 완성도를 높이는 데 주요한 역할을 한다. 현재까지 많은 가구 부자재가 가구제작 과정에 사용되고 있으나 3방향의 각재가 한 모서리에서 45°로 만나 고정되는 각재 매립형 부자재에 대한 사례는 국내 및 국외에서 찾기 힘들다. 전통적 가구제작방법의 하나인 ‘삼방연귀’ 결구 기술이 이어져 오고 있으나 제작 난이도로 인하여 숙련된 기술이 요구되어 일반화되기가 어렵고, 또한 생산성에 한계가 있어 3D 프린팅을 이용한 목가구 결구 부자재를 제시하고자 하였다. 삼방연귀 결구 부자재 개발을 위하여 혼용되어 불리는 삼방연귀 명칭의 조사를 시작으로 삼방연귀의 구조 및 적용 사례를 전통목가구와 현대목가구로 구분하여 조사하였고, 구체적인 3D 프린팅을 활용한 가구 커넥터는 각재간 고정 사례를 중심으로 구조적 특성을 분석하였다. 삼방연귀 부자재 시제품개발을 위해서는, 기존의 각재 연결방식과 3D 프린팅 고정 커넥터를 결합하여 각 부문의 장점을 강화하고 단점을 보완하는 디자인 콘셉트를 설정하였다. 결구 부자재 개발에는 3D 모델링과 3D 프린팅을 이용하여 목업 작업을 진행하였고, 출력물인 결구 부자재를 결합 전 이미지와 결합 후 이미지를 제시하였다. 본 연구의 삼방연귀 개발 결구 부자재는 외부에서 보이지 않는 매립형 구조이다. 이는 단순할 수 있는 목가구 디자인에 홈 가공 및 몰딩 처리를 할 수 있어 장식적인 효과를 얻을 수 있다. 전통적 제작방법보다 단순화된 작업공정은 자연스러운 목리와 간결한 선을 활용한 목가구 디자인의 접근성과 생산성을 높일 것이며, 각재로 구성된 선반, 수납장, 테이블 등의 모서리 결구에 유용할 것이다. In wood furniture production, utilizing hardware plays a significant role in enhancing quality of design, and have a direct effect on productivity and convenience as well. Up to the present, although there are diverse hardware in furniture making, it is hard to find cases inside and outside of Korea using embedded square lumber hardware that fixes square lumbers from three ways by meeting them on one point at the corner with 45 degrees. Even though three-way miter joint technique has been continued as one of traditional furniture making method, this is hard to be generalized because this demands high level of skill as well as has limit in production. For these reasons, the researcher proposes corner joint hardware for wood furniture using 3d printing. For developing three way miter joint hardware, this study starts with researching a term of three-way miter that is generally mixed with several ways of meanings. Secondly, the author researches structure of three-way miter and case study of its application example between traditional and modern wood furniture. In detail, researcher analyze structural character in furniture connector focused on fixing example between square lumbers for utilizing 3d printing. As for prototyping, 3D printed fixing connector is combined with existing square lumber joint system to strengthen and make up pros and cons of each part has. In this phase, 3D modeling and 3D printing is used for mock-up, and before and after image of combining 3d printed hardware is suggested. In this study, three way miter joint hardware has embedded structure, which is invisible outside. This can expect ornamental effect caused by molding and groove process on wood furniture that may looks simple. More simplified production process than traditional one would elevate productivity and access to wood furniture design with natural grain, and also be useful for corner joint that consist of square lumber including shelves, storage cabinets and table as well.

      • KCI등재후보

        인지능력 저하노인에 대한 HRV 측정기법에 관한 연구

        김완규,Kim, Wan-Kyu 한국전자통신학회 2015 한국전자통신학회 논문지 Vol.10 No.1

        This paper was performed for the older people with cognitive abilities deteriorated, and its effectiveness is analyzed through measurement value of HRV. This paper was investigated the major acupressure that has been used frequently to people who has to decrease cognitive ability in the old documents. We measure the several variation by using a measuring instrument of HRV after performing an operation of acupuncture and moxibustion for elderly degraded cognitive ability. As compared with the measured values, the moxibustion and acupuncture to changes in the autonomic nervous system, heart rate and how it affects the efficacy was measured. As a result of research, acupuncture and moxibustion could be confirmed through the HRV analysis that there is a positive effect on the improvement of cognitive skills. 본 논문은 인지능력이 저하된 노인들에게 침과 뜸 요법을 시행하고 HRV 측정값을 통하여 그 효과를 분석한다. 인지능력이 저하되거나 상실된 사람들에게 자주 사용되었던 주요한 경혈을 고문헌에서 조사하였다. 인지능력이 저하된 노인들에게 침과 뜸을 시술한 후 HRV 측정기를 이용하여 여러 가지 변화를 측정하였다. 측정된 값들을 상호 비교하여 자율신경계와 심박동수의 변화에 침과 뜸이 어떤 영향을 주는지 효능을 측정하였다. 연구 결과 침과 뜸이 인지능력의 개선에 긍정적이 효과가 있다는 것을 HRV 분석을 통해 확인할 수 있었다.

      • SCOPUSKCI등재

        A Partition Function for Liquid Metals

        김완규,Kim, Wan-Kyue Korean Chemical Society 1962 대한화학회지 Vol.6 No.1

        The author assumes that pure liquid metal is composed of molecular oscillators whose energy states are classified into two subgroups, i.e., A and B states, each being accesible to either one of the two sorts of lattice sites. The partition function involves constants characteristic of substance, which are obtainable from the Debye characteristic temperature assigned to its solid state. Calculation has been made for the various thermodynamic properties such as the vapor pressure, the entropy, and the heat capacity of liquid metals of GroupⅠelements over the temperature range from the melting points to the boiling points. The theoretical values thus obtained are in good accordances with those observed, within experimental error, although a slight derivation is observed in the atomic heat capacity. 筆者는 週期表 1族에 適用되는 液體金屬의 模型으로서 純粹한 液體金屬은 2原子分子의 單振動子로 構成되면 이 振動子는 自己가 古有하는 싸이트(site)種에 따라 두가지 에너지狀態中 하나를 取하게 된다고 假想함으로써 液體狀態和를 誘導하였다. 이 狀態和食은 本質的으로는 하나의 物質固有의 常數(${\Theta}$)를 內包하고 있으며 液體金屬에 대하여 이 特性値를 줌으로써 여러가지 熱力學的 性質 즉 蒸氣壓, 液體의 엔트로리, 比熱 等을 算出하여 實測値와 比較하여 보았다. 그 結果는 滿足스러운 一致를 보여준다.

      • SCIEKCI등재

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