• 제목/요약/키워드: Medium size

검색결과 2,479건 처리시간 0.037초

인 축정능이 우수한 세균의 분리 및 동정 (Isolation and Identification of High Phosphate-accumulating Bacteria)

  • 신공식;고정연;최우영
    • 한국미생물·생명공학회지
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    • 제27권4호
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    • pp.286-291
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    • 1999
  • By using autoradiography and phosphate medium, high phosphate accumulating bacteria were isolated from the soil of protected cultivation area and activated sludge. Selected strain, PO8, was gram-negative, rod/spherial(0.5~0.6$\times$1.0~1.2${\mu}{\textrm}{m}$ in size) and non-motile. PI4, another selected strain, was gram-negative, rod(0.4~0.5$\times$1.5~1.6${\mu}{\textrm}{m}$ in size) and motile. It also had flagella. According to their morphological, physiological and biochemical properties, the stains were identified as Acinetobacter lwoffi PO8 and Chromobacterium lividum PI4, respectively. A. lowoffi PO8 and C. lividum PI4 cultured in the P-1 medium containing 150ppm phosphate were able to uptake high phosphate up to 92% and 85%, respectively after 24 hours at 3$0^{\circ}C$ during liquid culture.

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중소도시 공동주택의 실내공기질(새집증후군) 실측에 관한 연구 (Field Measurements of Indoor Air Quality in Apartment Units at Medium-size Cities)

  • 윤재옥
    • KIEAE Journal
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    • 제10권4호
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    • pp.81-86
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    • 2010
  • The main sources of the new house syndrome(sometimes it called sick building syndrome) are a concentration of formaldehyde (HCHO) and a concentration of total volatile organic compounds(TVOC). I had field measurements of indoor air quality in the apartment unit at medium-size cities(Y city, C city). I measured indoor air temperature, HCHO concentration in 16 units, TVOC concentration in 6 units and air tightness in 7 units. And I measured outdoor air quality, HCHO concentration and TVOC concentration. Mean concentration of HCHO was $357{\mu}g/m^3$(2006 standard=$120{\mu}g/m^3$), mean concentration of TVOC was $3,092{\mu}g/m^3$ and mean effective air leakage area was 193 cm2. There was a close relation between the indoor air temperature and HCHO concentration, between the indoor air temperature and TVOC concentration. Air tightness also had relation.

최근 서울시 중형 OFFICE 건물의 실내재료의 사용경향에 관한 연구 (A Study on the Using Trends of Interior Materials in Current Medium Size Office Building in Seoul)

  • 김은중
    • 한국실내디자인학회논문집
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    • 제23호
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    • pp.19-25
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    • 2000
  • This study aims by analysing the interior design elements trends of current medium size office buildings in Seoul. The analysing objects are ceiling, floor, wall, and illumination plan of current office buildings. Analysing tools are finishing material and color of each part. Analysing areas are lobby area, deskwork area, conference area, welfare area, public area(rest room, corridor, stair). The interior design elements of lobby shows a lots of different features then the other areas in ceiling, floor, and wall design. Such difference appears at finishing material especially, and the coloring is more splendorous then the other areas. Desk work area and conference area have similar characteristics in finishing materiors and colors, and they usually follow the needs of function. Walfare area shows more splendorous feature then deskwork and conference area, and designed by various materials and colors. Public area also shows very active design concept then past times.

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고속 중형 Ro-Pax선의 개발 (Development of Medium Size High Speed Ro-Pax Vessel)

  • 이건호;김진현;장학수;주영렬;전호환
    • 대한조선학회논문집
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    • 제41권1호
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    • pp.64-69
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    • 2004
  • In recent years, Medium size high speed Ro-Pax vessel has appeared at European sea and especially Agean sea is a center of operating in this type of Ro-Pax. This vessel operates its high Froude number range and requires higher engine power due to considerably increased resistance in comparing to large Ro-Pax in high speed range. SHI has investigated this kind of high speed Ro-Pax in accordance with market requirements and developed more advanced vessel to meet the future market needs. Process of hull form development, model test results and design of general arrangement results are introduced in this paper.

전파 Jet 3C449의 동역학적 모형

  • 정홍대;윤홍식;최승언
    • 천문학논총
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    • 제4권1호
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    • pp.1-15
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    • 1989
  • A jet plasmoid model for 3C.449 has been constructed by introducing a plasma.ejecting black hole orbiting around the center of its parent cD galaxy. We examined the characteristics of the jet trajectory by varying the values of (1) orbiting radius and velocity of the black hole, (2) plasma ejection velocity, (3) size, mass and space velocity of the parent galaxy, (4) size of the galactic core and (5) the density of the intergalactic medium. In our model calculation the effect of the gravity by the parent galaxy and the ram pressure by the intergalactic medium have been taken in account. It is found that our dynamical model accounts reasonably well for the observed structure of 3C449. Our proposed model suggests that the buoyancy force near the galactic center plays an important role in the formation of the curved structure of the radio jet.

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중용량 증기터빈 제어기의 신뢰성 검증을 위한 시뮬레이터 구현 (A realization of simulator for reliability verification on medium size steam turbine controller)

  • 최인규;우주희
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2000년도 하계학술대회 논문집 D
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    • pp.2578-2580
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    • 2000
  • A siumlator had been developed and used for reliability verification on medium size steam turbine control programs prior to its actual operation in field. A mathematical model on thermal dynamics pertaining to prime mover steam turbine and electrical generator was realized and included in this simulator. Also, many operating data acquired from fields was utilized in order to decide mechanical and thermal dynamic characteristics such as friction loss, windage loss and inertia. A user can decide closing or opening velocity of steam stop valve and steam regulation valve. This simulator is able to generate steam pressure, turbine speed, electrical power, and power system frequency.

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점탄성 폴리머 용액에서의 초미세 폼의 생성 (Generation of Microcellular Foams in Viscoelastic Polymer Solutions)

  • 강성린;김기영;곽호영
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2004년도 춘계학술대회
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    • pp.174-179
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    • 2004
  • The growth of the critical size bubble by diffusion process in viscoelastic medium was treated by an integral method for the concentration boundary layer adjacent to the bubble wall. In this study, we obtained a set of the first order time dependent equations to obtain bubble radius and gas pressure inside the bubble simultaneously. The calculated final cell sizes depending on the initial saturation pressure are in close agreement with the observed ones. The governing equations developed in this study may be used in polymer processing of microcellular foams.

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중소수출기업의 특성에 따른 수출 활성화 저해요인 인식차이에 관한 연구 (A Study on Differences in Perception of Export Disruption Factors by Characteristics of Small and Medium Export Companies)

  • 노윤진
    • 아태비즈니스연구
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    • 제9권1호
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    • pp.39-55
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    • 2018
  • Exports play an important role in Korea's economy and industry. Korea's share in world trade is also increasing. Governments and trade organizations are making great efforts to promote exports. However, since SMEs lack resources of enterprises, SMEs have a lot of difficulties in increasing exports compared to large enterprises. For this reason, in this study, we analyzed the difference of perception of export difficulties according to characteristics of small and medium export companies. As a result, four factors such as overseas market information, price and cost, competitiveness and regulation of importing country were derived. In addition, we investigated the differences in recognition of export difficulties by the stage of growth of company, period of export, products exported, export department, size of company. There was a significant difference in recognition. Especially, The companies which are the early stages of growth, short export period, finished product, the smaller the size of exports companies are more difficult in export difficulties.

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공급 사슬 환경에서 중소 제조 기업의 가격 결정 전략에 관한 연구 (A Study on Pricing Decision Strategy of Small and Medium Size Manufacturing Company in Supply Chain Environment)

  • 황승준;김태영;금병찬
    • 산업경영시스템학회지
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    • 제34권2호
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    • pp.68-75
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    • 2011
  • The purpose of this paper is to suggest a supplier and buyer's pricing decision strategy model with discount-policy over a long-term replenishment contract in a supply chain environment by small and medium size manufacturing company. We assume that the buyer has a superior economic power over a supplier and each agent in a supply chain is unaware of each other. The supplier proposes pricing decision strategy to induce the buyer to choose the terms of contract for the benefit of the supplier. Then buyer decides the terms of contract to maximize her profit considering supplier's discount-policy. We also present a numerical example to illustrate the efficiency of pricing decision strategy.

중형 헬리콥터 로터 시스템 개념설계 연구 (A Study of the Conceptual Design of Medium Size Utility Helicopter Rotor System)

  • 김준모
    • 한국군사과학기술학회지
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    • 제8권3호
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    • pp.33-41
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    • 2005
  • This paper describes the conceptual design of medium size helicopter rotor system. Based on assumed design requirements, trade-off study for rotor configuration has been conducted in terms of rotor tip speed, disk loading, blade area, solidity, etc for estimated primary mission gross weight. For the main rotor, four-blade and five-blade rotors are studied with the conventional tail rotor. The performance analysis for baseline configuration is conducted using a helicopter performance analysis program. The analysis shows design results satisfy the design requirements.