정수슬러지 특성과 폴리머 개량에 따른 점성 변화

구석본, 곽복식, 권재현 경성대학교 환경문제연구소 2000 環境硏報 Vol.10 No.1

The most important thing in sludge treatment is to reduce the volume of sludge. To achieve this purpose, sludge is usually dewatered after conditioning by polymer. For efficient dewatering and its economic operation, polymer should be dosed properly. Therefore, the possibility of filtrate viscosity as a tool for the optimization of polymer dose in waterworks sludge conditioning was estimated in this study. In conclusion, it may be effective and accuracy to use filtrate viscosity as a control parameter to determine the optimum dose of polymer in sludge dewatering. Especially in case of cationic polymer conditioning, filtrate viscosity can be used effectively for this purpose. However, In contrast filtrate viscosity can not be utilized as a control tool if nonionic or anionic polymer were dosed.

當歸飮子 水抽出物이 抗 ALLERGY 反應과 MOUSE의 免疫細胞機能에 미치는 影響

盧石善,李起男 圓光大學校 韓醫學硏究所 1992 원광한의학 Vol.2 No.1

This study were done to know the effects of Dangkiyeumja(當歸飮子) on the in vivo and in vitro immune responses of mice. The recipes of Dangkiyeumja used in this study enhanced such cellular functions of immunocytes as phagocytic capacity of macrophages, rosette forming abilities of splenocytes and metabolic activities of lymphocytes. However, the same recipes decreased the formation of such reactive oxygen intermediates(ROI) as superoxide and hydrogenperoxide from the macrophages. The effects of the same recipes on the in viro immune responses was suppressive no the cellular immune response(CIR) measured by delayed-type hypersensitivity against dinitrofluorobenzene and midily enhancing for the humoral immune response measured by antibody production against sheep red blood cells. The results of this study could be summarized as follow: 1. Administration of Dangkiyeumja enhanced the phagocytic activity of the murine macrophage. 2. Administration of Dangkiyeumja decreased the formation of ROI in the murine macrophage. 3. Administration of Dangkiyeumja increased the number of the splenic rosette forming cells in the mouse. 4. Administration of Dangkiyeumja did not affect the antibody production against sheep red blood cells. 5. Administration of Dangkiyeumja depressed the delayed-type hypersenitivity against dinitrofluorobenzene in the mouse. The result of this study suggest that Dangkiyeumja could ameliorate the hypersensitivity reactions by reducing the formation of ROI and decreasing the CIR without affecting the other functions of immunocytes.

모델매칭기법을 이용한 소형 밀폐공간 궤환 능동 소음 제어기의 설계

서석봉,정태진,정찬수 崇實大學校 生産技術硏究所 1996 論文集 Vol.26 No.2

In the small cavity, ANC(active noise controller) problem become very complicate due to the nonlinear characteristics and the modelling errors. When we ignore them in designing a controller, the performance will be considerably poor or the controller will lost its function. Therefore, this paper used the H() control method to solve these problems and applied this method to the model-matching method in designing the active noise controller. Based on the characteristic of the small cavity, the noise control problem can be interpreted as the H() regulating problem and can be solved by linear riccati equations. The designed controller was implemented with hardware such as Op-amps and its performance was verified in the case of broad band noise. As a result, the designed controller showed that its performance in the frequency range between 100Hz and 300Hz was about 35dB.

The Hindu.Moslem Divide and The Way to Indian Independence

Den?se K?hler 부산외국어대학교 사회과학연구소 1987 社會科學論叢 Vol.2 No.-

1947년 8월 15일 영령인도제국은 인도와 파키스탄으로 분리되어 해체되었다. 인도와 파키스탄의 정치적•경제적 배경은 공통적인 것이었으나 힌두교와 이슬람교라는 종교적 이유 때문에 두개의 국가로 분리되어 독립한 것이다. 힌두-무슬림의 대립은 인도 민족주의의 발생기인 1900년대 초부터 시작되었다. 즉, 영국인들과 접촉이 빈번했었던 힌두들은 서구의 각종 문물을 쉽게 받아들여 새로운 시대의 중산층으로 등장했고 민족주의 운동의 중심세력으로 성장하였지만 영국인들을 배척했었던 이슬림교도들은 상대적인 낙후세력우로 전락할 수 밖에 없었다. 또 영국인들의 의도적인 분리 통치 (Divide and Rule) 정책은 이 두 집단 사이의 적대감을 더욱 심화시켰고 이 상황은 1905년 무슬림연맹이 창설됨으로써 노골화 되었다. 1947년까지의 독립투쟁 기간중 무슬림연맹은 영국에 대항하였다기 보다는 힌두가 중심인 국민회의파에 저항했었다고 해도 과언이 아니다. 1920년대의 비협력운동, 1939년의 전쟁비협력운동 등에서도 무슬림연맹은 오히려 영국측에 서서 국민회의파에 대항함으로써 인도 민족주의 운동을 혼란시켰다. 1947년 분리독립은 1920년대초 영국에 유학중이던 몇몇 이슬람교도들의 착상에서 부터 비롯된 것이었다. 이 착상은 곧 많은 이슬람 정치가들의 지지를 받았고 이것이 모하메드 · 알리 • 지나와 자와하랄 • 네루의 정치적 타협에 의하여 실현된 것이다. 마하트마 · 간디는 분리독립의 마지막 순간까지 이것을 반대하였지안 그의 반대는 이상론에 불과하다고 묵살당했다.

Poly(urethane-styrene-styrene sulfonic acid) random copolymer/Inorganic Nanocomposite Film을 이용한 Proton Exchange Membrane의 합성

김주영,장석용,박호범 한국공업화학회 2003 응용화학 Vol.7 No.1

최근 polymer Electrolyte Fuel Cell (PEFC)은 운송수단의 차세대 에너지원으로써 그 연구가 활발히 진행되고 있다. 이러한 PEFC의 핵심부분은 Proton Exchange Membrane으로, 이러한 Membrane으로 가장 대표적인 것이 Nafion이지만, 가격이 매우 비싸다는 단점을 가지고 있다. 이를 해소하기 위해 다양한 종류의 Polymer Membrane이 PEFC용 Membrane으로 연구되고 있다.본 연구에서는 최근 큰 관심을 모으고 있는 Polymer/Inorganic Nanocomposite를 이용하여서 새로운 형태의 Proton Exchange Membrane을 합성하였다. 즉, Nano-size의 Organo-Clay를 DMAc/Water 혼합용매 존재 하에서 Amphiphilic Urethane Acrylate/Styrene/Sodium Styrene Sulfonate 혼합물과 혼합하여서 Nano-size로 용액에 분산시키고, 이후 라디칼 공중합을 통하여서 Inorganic Nanoparticle이 Nano-size로 분산된 Nanocomposite Membrane을 합성하였다. 합성된 Membrane은 10^-2S/cm^-1이상의 전도를 나타내었다.

규소에 있어서 인의 확산공정에 대한 2차원적 수치해석 모델

고관영,이종화,윤석길 울산대학교 1992 공학연구논문집 Vol.23 No.2

반도체 집적회로 제조과정중의 불순물 확산공정은 일반적으로 예비석출과 주입의 두 공정으로 이루어진다. 본 연구에서는 불활성 분위기나 질소 분위기에서 인의 예비석출과 주입을 시행할시 확산에 대한 모델을 설정함으로써 수치해석법에 의해 최종 농도분포를 계산하였다. 확산계수의 모델로서는 공공기구를 기초하여 Fair와 Tsai가 제시한 모델을 사용하였다. 고농도 인의 확산 경우에는 불순물 원자로 인한 변형때문에 생기는 에어지 갭 감소효과를 고려하였다. 인의 표면 농도는 내삽법으로 구하여 사용하였다. 확산 방정식을 선형화하기 위하여 유한 차분법을 사용하였으며, 해를 구하기 위해서는 Stone의 SIP 방법을 적용하였다. The impurity diffusion processes in semiconductor integrated circuit fabrication in general consist of predeposition and drive-in diffusions. In the present work, the final impurity distributions in silicon through phosphorus diffusion processes in inert or nitrogen atmosphere were calculated using computer-aided numerical analysis methods. The diffusion coefficients of substitutional impurities were modeled with vacancy mechanism. It is assumed that the phosphorus diffusion is controlled by Fair and Tsai model. An effect of the narrowed energy gap due to the strain by very high concentration of phosphorus was approximated by the interpolation. For the linearization of diffusion equation the finite difference method was utilized. For the solution of the resulting simultaneous equations the strong implicit procedure by Stone was used.

PIEZOCONE을 利用한 軟弱地盤 分析에 關한 硏究

류제천,박춘수,정석영 忠南大學校 産業技術硏究所 1995 산업기술연구논문집 Vol.10 No.2

In domestic research, standard penetration test and cone test have been used largely for the investigation of soft ground. But standard penetration test has been developed to apply to sand and its result is under the influence of experimenter's skill. The cone used so far has also experimental limitation in the point that penetration into stiff ground is difficult. Recently Piezocone is used world-wide for the investigation of soft ground. Piezocone makes it possible to get more acculate information upon ground because to add to the function of existing cone, it has that of measuring pore water pressure. In this thesis the result of this research is compared with that of laboratory test in the same area. In the result of study the coefficient of consolidation in the horizontal direction of investigation area is ?? and the mean of the cone factor is 15. There is little difference in the soil classification between by Piezocone test and by existing tests. If Piezocone is continuously studied, revised and amended to be suitable for domestic condition, more correct and pre cise research on soft ground will be possible.

計測을 통한 흙막이構造物 安定性 檢討에 關한 硏究

정석영,박춘수,류제천 忠南大學校 産業技術硏究所 1995 산업기술연구논문집 Vol.10 No.2

Recently, many deep excavation have been practiced in constructing building or subways in urban areas to utilize more effectively underground space. In doing such underground excavations, information-oriented construction through the field measuring is getting more important not to give damages the next buildings and to practice in safety. The earth pressure, horizontal displacement, underground water table and so on are included in the item to make sure of safety through the field measuring. The empirical earth pressure come from the strut retention. But in recent days the two reasons have made the construction having been used through anchored retention why the width of earth retaining is so wide and here is a purpose to make use wider and wider the space of work. I come to make conclusions as follow to observe the safety of earth retaining structures with horizontal displacement and underground water table and to study lateral earth pressure of anchored retention earth retaining walls with load cells on the anchored retention sites.

규소에 있어서 붕소의 확산에 대한 2차원적 수치해석 모델

고관영,송준호,윤석길 울산대학교 1992 공학연구논문집 Vol.23 No.2

본 연구에서는 불활성 분위기에서 규소에 대한 붕소의 예비석출과 주입에 대한 확산모델을 세워 수치해석법으로 최종 농도분포를 계산하였다. 확산계수의 모델로서는 공공기구를 사용하였으며, Fair모델을 사용하였다. 붕소의 표면농도는 내삽법에 의해 구하였다. 확산 방정식의 선형화 방법으로는 유한 차분법을 사용하였으며, 해법으로는 Stone의 SIP 방법을 적용했다. 시뮬레이션 결과와 실험치의 비교로부터 제시된 모델의 유효성을 확인하였다. In the present work, the final impurity distributions in silicon through boron diffusion processes in inert atmosphere were calculated using computer aided numerical analysis methods. The diffusion coefficients of substitutional impurities were modeled with vacancy mechanism. It is assumed that the boron diffusion is governed by Fair model. The surface concentration of boron was approximated by the interpolation. For the linearization of diffusion equation the finite difference method was utilized. For the linearization of diffusion equation the finite difference method was utilized. For the solution of the resulting simultaneous equations the strong implicit procedure by Stone was used. It is observed that the simulated results of boron diffusions have been well-fitted to the experimental results.

Change in the Friction Coefficient of Recycled Linerboard from Aseptic Carton by the Calendering Treatment

Sek Bih Fang(섹비팡),Jeong-Yong Ryu(류정용) 한국펄프·종이공학회 2022 한국펄프·종이공학회 학술발표논문집 Vol.2022 No.4