• Title/Summary/Keyword: Stirred Part

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Effect of Flow Distribution on the Combustion Efficiency In an Entrained-Bed Coal Reactor (분류층 석탄반응로에서 유동분포가 연소성능에 미치는 영향)

  • CHO, Han Chang;SHIN, Hyun Dong
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.23 no.8
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    • pp.1022-1030
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    • 1999
  • A numerical study was carried out to analyze the effect of flow distribution of stirred part and plug flow part on combustion efficiency at the coal gasification process in an entrained bed coal reactor. The model of computation was based on gas phase eulerian balance equations of mass and momentum. The solid phase was described by lagrangian equations of motion. The $k-{\varepsilon}$ model was used to calculate the turbulence flow and eddy dissipation model was used to describe the gas phase reaction rate. The radiation was solved using a Monte-Carlo method. One-step parallel two reaction model was employed for the devolatilization process of a high volatile bituminous Kideco coal. The computations agreed well with the experiments, but the flame front was closer to the burner than the measured one. The flow distribution of a stirred part and a plug flow part in a reactor was a function of the magnitude of recirculation zone resulted from the swirl. The combustion efficiency was enhanced with decreasing stirred part and the maximum value was found around S=1.2, having the minimum stirred part. The combustion efficiency resulted from not only the flow distribution but also the particle residence time through the hot reaction zone of the stirred part, in particular for the weak swirl without IRZ(internal recirculation zone) and the long lifted flame.

A Study on Anti-Design and Italian Radical Fashion (안티디자인과 이탈리아 급진주의 패션에 관한 연구)

  • 이현미
    • The Research Journal of the Costume Culture
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    • v.9 no.1
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    • pp.154-168
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    • 2001
  • This study is intended to understand an implication and significant of anti-design and Italian radical fashion. Anti-design and radicalism is the main stream or origin and essence of post-modernism which hs been swaying our society at large through modern culture, economy, art, fashion etc, from the latter part of 1960s. In this paper, the author classified the italian radical fashion with the Archizoom, the Alchymia, the memphis fashion. In post-modernism fashion, radical fashion design of the Archizoom, Alchymia and Memphis group is in part a menifesto and in part a noncanonical history of the most progressive and heretical experiments of the world of fashion. Anti-designers of Italy call for a theory an practive in which the old methods and instruments and the old commendments of modernism are banished. They looked on fashion as material culture, a creative field with its own independent foundation and endowed with its own strong artistic intuition. IF radical design is dead, the energy it has stirred up is still alive nd kicking. One of the most progressive and well-informed culture milieus in Milian, seved as a point of reference for the vanguard of fashion.

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Ultrafiltration Treatment for Car Washing Effluent (한외여과막을 이용한 자동차 세척배수의 처리)

  • 장규만
    • Membrane Journal
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    • v.9 no.4
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    • pp.202-208
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    • 1999
  • The car washing effluent containing various oils and detergent was treated by ultrafiltration membranes. Dead-end type stirred cell (Amicon 8050) with 10, 30 and lOOk dalton membranes was used to determine permeation and rejection characteristics for the car washing effluent. In case of low molecular weight cut-off membranes, the effect of membrane fouling was weak under the applied pressures. However, the permeation flux for YM100 membrane(look dalton) may be affected by oil layer formation on the membrane surface as well as oil particle plugging for a part of membrane pores due to compressible and deformable oil properties. Oil and particle rejections in the permeates were over 95%, but detergent was passed easily through the membranes. Hence, the permeates containing detergent can be recycled to the system, and may reduce water pollution. Also, the car washing effluent was treated continuously by a capillary type ultrafiltration membrane of MWCO 50k dalton. The experimental data were fitted suitably to the cake filtration model.

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Survey study on the quantity cookery of steamed rice. (많은 양의 밥짓기에 대한 실태조사)

  • 이혜수
    • Journal of the Korean Home Economics Association
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    • v.8 no.1
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    • pp.93-99
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    • 1970
  • To Know the factors required to make best quality of steamed rice with large amount of rice, several organizations that serve meals were surveyed. Factor that mostly influence the amount of water to the amount of rice is a kind or rice. In the case of good quality rice, when the amount of rice is more than 10cups, the ratio of water to rice is 0.9 and that of poor quality rice is 0.7 Average ratio is 0.8 Therefore, ordinarily with the ratio of 0.8, good quality of steamed rice can be made. Washed rice should be used to measured the of rice. To make a good quality of steamed rice with large amount of rice, center part of the boiling rice should be stirred generously several times to equalize the temperature.

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The Effects of Improvement in Clay with High Moisture Contents Using the Filter Type Vacuum Consolidation Method (필터형 진공압밀공법을 이용한 고함수비 점토지반의 개량효과)

  • Oh, Sewook
    • Journal of the Korean GEO-environmental Society
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    • v.11 no.9
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    • pp.55-60
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    • 2010
  • This study are carried out to an lab model tests to develop a construction method that solidifies high-water content cohesive soil by using filter type drain and vacuum pressure, and that stabilizes the ground by accelerating horizontal drain at incline or in tunnel. The calibration chamber was designed within length of 1.5m and height of 50cm, and a drainage hole for preconsolidation, a switchgear and a piezometer were installed at the bottom part of the chamber. Also, a settlement gage was installed at the top part so that it can measure the settlement by time. The calibration ground basis was made in a form of thin layer from kaolinite and bentonite in 9:1 ratio stirred at 130% water content condition. A filter type drain was installed at chamber center and a vacuum pressure of 0.8MPa was applied through a hose linked to the cap at the top part, then, the settlement was measured in every 1 hour interval. After experiment, the moisture contents were measured by position, then, verified the increase of solidity of the ground through a triaxial compression test on undisturbed profile. After 11 days from the effective date, it was observed that the settlement decreased by maximum 35mm and the water content ratio was reduced by 38% at most while the solidity of the ground increased by 5~8 times greater than before preconsolidation.

Study on ShangHanLun BianMaiFa (1) ("상한론(傷寒論)-변맥법(辨脈法)"에 관한 연구(1))

  • Cho, Eun-Kyung;Choi, Jong-Moon;Kim, Yun-Ju;Hong, Jin-Woo;Shin, Sang-Woo
    • Journal of Physiology & Pathology in Korean Medicine
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    • v.25 no.6
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    • pp.945-960
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    • 2011
  • The BianMaiFa chapter, which is the first chapter of SongBon ShangHanLun, is the scholarly description(專論) of the pulse and pathological mechanism but has not been studied and published yet. This study is about article 1-10 which is the first part of The BianMaiFa chapter. We compared the original texts within the editions, comparing and analyzing the annotations of successive dynastic medical group. The articles of The SongBon ShangHanLun BianMaiFa chapter 1-10 is consisted as is shown: article 1 discriminates pulse by yin-yang and states about the prognosis of disease according to pulse, article 2 states about binding in yin and binding in yang which is from abnormal exuberance of yin and yang, article 3 states about the pulse and pathological mechanism of chills with fever, article 4 states about pathological mechanism and symptom of nutrient and defense through pulse, article 5 distinguishes within binding in yang(陽結), binding in yin(陰結), yang faintness(陽微), yang debilitation(陽衰), blood collapse(亡血) by the pulse which was in article 2 3 4, article 6 7 8 9 10 states states about the shape or pathological mechanism of bound pulse(結脈) skipping pulse(促脈) stirred pulse(動脈) moderate pulse(緩脈) string-like pulse(弦脈) tight pulse(緊脈) drumskin pulse(革脈). Article 4 could be understood that inch pulse is floating and deficient shape and cubit pulse is sunken and weak shape(寸脈浮虛, 尺脈沈弱) related to article 3, article 5 could be understood as binding in yin and yang is aggregation shape related to article 2, yang-qi faintness is floating and debilitation shape, yang-qi debilitation is sunken and faint shape, blood collapse is deficient and stasis shape related to article 3 4.

A Study on Korean Film Criticism at the Initial Stage - the case of the 1920s and the mid-1930s - (초창기 한국영화비평에 관한 연구 - $1920\sim1930$년대 중반까지를 중심으로 -)

  • Jeon Pyung-Kuk
    • The Journal of the Korea Contents Association
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    • v.5 no.6
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    • pp.193-208
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    • 2005
  • The purpose of this study was to look into Korean film criticism that started during Japanese occupation. It's specifically attempted to shed light on the development and significance of Joseon film criticism and on film movement theory as part of the history of Korean early modern film criticism. When kino-drama that could be called the start of Joseon movies was popular, enlightenment-based view of movie was rampant due to the inflow of western civilization and modernistic consciousness. Afterwards, the nature of movie itself drew a lot of attention from contemporary people in the silent picture days, and there appeared a critical trend in pursuit of artistry. Diverse criteria of criticism about reality and representation were presented, and a lot of disputes were eventually stirred up. Thus, criticism started to make a progress. A proletarian film movement theory, the so-called KAPF film campaign that was prevalent from the mid-1920s to the mid-1930s, was one of leading contemporary movie theories and took the lead in critic community. That had a great impact on the entire Joseon film circles. That took a proletarian view of movie, which was based on Bolshevik theory of Popularization and dialectic historical materialism. their criticism made a contribution to providing information on foreign movies and theories and to presenting main principles and multiple alternatives toward film organization and playing.

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Studies on the Biological Active Substance produced by a Strain of Streptomyces sp. Part I. Isolation and Biological Characterization of the Substance (Streptomyces속 균주가 생성한 물질의 생물활성에 관한 연구 제 I보 생성물질의 분이및 그 생화학적성질)

  • 송방호;서정훈
    • Microbiology and Biotechnology Letters
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    • v.3 no.2
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    • pp.63-68
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    • 1975
  • A biological active substance was isolated from the cultured medium of Streptomyces sp. and its biochemical characteristics were investigated. Isolation process of the substance was as follows; the pH of filterate of the cultured medium was adjusted to 3.0 with N-hydrochloric acid and saturated with sodium chloride, then chloroform was added to this filterate in one fifth portions and stirred vigorously. After extracting the active substance with chloroform in 3 stages, the chloroform layer combined and evaporatea after dehydrating with sodium sulfate. The substance was found to be to be toxic to various fresh water fishes; the lethal dose for an average size Pseudorasbora parva T. et. S. was 50ug per ml. In the acidic condition, the toxicity of the substance remained fora long time, while in the alkaline state, the toxicity was decreased very fast. This substance was found to be stable to organic solvents, but labile to heat treatment. The maximal revival time of Pseudorasbora parva T. et. S. was about 20 minutes in 25 ug/ml of the substance solution.

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The Water Quality in the Soho Coastal Seawaters of Gamak Bay Before and After a Typhoon (가막만 소호해역에서 태풍 전후 수질 변동특성)

  • Lee Young-Sik;Moon Seong-Yong
    • The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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    • v.11 no.3
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    • pp.117-123
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    • 2006
  • The water quality before and after a typhoon was investigated as a part of a study on the increase of organic matter and on the fundamental measures to counter chemical oxygen demand (COD) in the eutrophic Soho coastal seawaters of Gamak Bay. The dissolved oxygen (DO) saturations were <54% when water column was stratified. The DO saturation was similar at surface and in the bottom layer after a typhoon $(78\sim88%)$, and a very high DO saturation (234%) was observed in the surface water after mass phytoplankton growth. The highest values of $NH_4-N,\;NO_3-N,\;PO_4-P$, and $SiO_2-Si$ were 18.22, 38.90, 1.58, and $52.10{\mu}M$, respectively, when freshwater entered after heavy rainfall events. In addition, high concentrations of $NH_4-N,\;PO_4-P$, and $SiO_2-Si$ were detected with low DO saturations in bottom water (>5m). A maximum chlorophyll (Chl.) concentration of $311.0{\mu}gl^{-1}$ was observed after typhoon, when a high-density Scrippsiella trochoidea red tide occurred with cell density of 42,000 cells $ml^{-1}$. The algal growth potential (AGP) was high after the typhoon. Nitrogen was always a limiting nutrient for phytoplankton growth. The highest COD level was $10.55mgl^{-1}$, and the main reason of the variation in COD was likely to be phytoplankton growth $(r^2=0.612,\;p=0.000)$. Organic matter, which entered the water column when the typhoon stirred the sediments, seems to have little effects on COD increase.