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밀폐공간내 화재에 의한 생성된 연소가스 분석 및 유동에 관한 연구
추병길,조성곤 한국산업안전학회 1997 한국안전학회지 Vol.12 No.1
The natural convection and combined heat transfer induced by fire in a rectangular enclosure is numerically studied. The model for this numerical analysis is partially opened, it is divided by a vertical baffle projecting from ceiling. The solution procedure includes the standard k-ε model for turbulent flow and the discrete ordinates method (DOM) is used for the calculation of radiative heat transfer equation. In this study, numerical simulation on the combined naturnal convection and radiation is carried out in a partial enclosure filled with absorbed-emitted gray media, but is not considered scattering problem. The velocity vectors, streamlines, and isothermal lines are compared the results of pure convection with those of the combined convection radiation, the combined heat transfer. Comparing the results of pure convection with those of the combined convection-radiation, the combined heart transfer analysis shows the stronger circulation than those of the pure convection. Three different locations of heat source are considered to observe the effect of heat source location on the heat transfer phenomena. As the results, the circulation and the heat transfer in the left region from heating block are much more influenced than those in the right region. It is also founded that the radiation effect cannot be neglected in analyzing the building in fire.
밑면이 부분 가열체를 갖는 정사각 밀폐공간내의 자연대류와 화재감지에 관한 연구
추병길 한국산업안전학회 1990 한국안전학회지 Vol.5 No.2
In this paper, the natural convection in a square enclosure, partly heated from below, with two adiabatic vertical wall and one upper horigental wall is studied numerically. In numerical study, SIMPLE(Semi-Implicit for Pressure Linked Equation) algorithems are applied for the integration of momentum and energy equation. The grid size used in this study is the coordinates of size (22×22). As a result of numerical analysis, the initial fluid flow depends on the thermal diffusion, but, as time passes, the fluid flow depends on convection and buoyancy of the enclosure. In Gase 1, the heating region was been in the central position of the bottom wall. In cases 2, the heating region was in the left position of the bottom. In case of Case 1, the lapse time of sensing the temperature of 72℃ is approximately 15 sec almost at the same time in the coordinates (6, 22), (11, 22). In case of Case 2, the lapse time in the coordinates (6, 22), (11, 22) was 27 sec, 25 sec repectively. Also in case of Case 1 or Case 2, the gradients of y-position of the two sensors are transposed each other.
어성초(魚腥草)의 줄기배양에 의한 식물체(植物體) 재분화(再分化)
추병길,류점호,두홍수,권태호 한국약용작물학회 1996 한국약용작물학회지 Vol.4 No.2
약용식물(藥用植物)로써 이용 가능성 큰 어성초(魚腥草)의 이차(二次) 대사산물(代謝産物)의 생산에 기초가 되는 조직배양체계(組織培養體系)를 확립하고자 어성초(魚腥草)의 절간(節間), 절(節) 및 엽(葉)의 절편체(切片體)를 이용(利用)하여 캘러스를 형성(形成)시키고, 형성(形成)된 캘러스로부터 식물체(植物體) 재분화(再分化)를 시도하였다. 1. Embryogenic 캘러스 형성(形成)은 모든 절편체(切片體)에서 2, 4-D 1 mg/L와 kinetin 0. 5 mg/L을 첨가(添加)하였을 때 가장 효과적이었다. 2. 절간(節間)에서의 캘러스 형성(形成)이 엽(葉)보다 더 효과적이었다. 3. 어성초(魚腥草)의 절간(節間)으로부터 embryogenic 캘러스 형성(形成)은 ½ MS 배지(培地)가 효과적이었다. 4. 배지내(培地內)에 1%의 활성탄(活性炭)을 첨가(添加)하였을 경우 캘러스를 형성(形成)시키지 않고 배양(培養)된 절(節)로 부터 직접 식물체(植物體)가 분화(分化)되었다. 5. Embryogenic 캘러스로부터 식물체(植物體) 재분화(再分化)는 0. 2 mg/L NAA와 1 mg/L BA를 첨가(添加)한 배지(培地)가 다른 조합(組合)의 배지(培地)보다 분화율(分化率)이 높았다. Plant regeneration from the stem tissue of Houttuynia cordata Thunberg was investigated. The medium supplemented with the combination of 2, 4-D 1 mg/L and kinetin 0. 5 mg/L was the most effective for the embryogenic callus formation. The internode segment produced more callus formation than the leaf segment. ½ MS medium was the most effective for the embryogenic callus formation. The medium supplemented with the 1% activated charcoal produced the whole plant directly without the callus formation from the nodes. The medium supplemented with the combination of NAA 0. 2 mg/L and BA 1 mg/L was the most effective for the plant regeneration from the embryogenic callus.
소화용 스프링클러 헤드의 살수분포 및 수적 특성에 대한 연구
추병길,최종욱,차경세 한국산업안전학회 2001 한국안전학회지 Vol.16 No.2
The effect of water spray for the fire sprinkler depends on droples distribution over maximum possible floor area. The present study are carried out for the characteristics of water spray and droplets experimentally and numerically from two fire sprinkler heads which are CHM head and CHl head. CHM head is self-production and CHl head is widely used up to date. As the result of using CHM head, water spray and droplets are distributed over large area, because CHM head has smooth surface and non-flamed shape. When the pressure of fire sprinkler head is low, SMD(sauter mean dieter) is large and when the pressure of fire sprinkler head is high, SMD is small.
추병길,김대향,정주리,임주락,박춘봉,고병섭,류점호 한국약용작물학회 2005 한국약용작물학회지 Vol.13 No.4
천문동 (Asparagus cochinchinesis (Lour.) Merr.)의 기내생장과 증식의 가능성을 검토하기 위하여 신초의 유기, 생장 및 발근에 적합한 배지, 식물생장조절제, 배양온도를 검정한 결과를 요약하면 다음과 같다. MS 기본배지에 3.0 mg/l BA 처리시 신초의 유기 및 생장이 가장 양호하였으며 MS 기본배지에 0.5 mg/l IBA 처리가 발근에 가장 효과적이었고 기내배양 온도는 23~25℃가 적합하였다. This study was carried out to investigate the optimal conditions for efficient in vitro growth of Asparagus cochinchinensis (Lour.) Merr. shoot derived from shoot tip. Shoots were successfully cultured in MS medium. It was found that 23℃~25℃ were suitable for shoot growth. The growth of shoot was greatly influenced by cytokinins. The shoots derived from shoot tip were well elongated on MS medium supplemented with BA and zeatin. In vitro shoots were very poor or no growing. Especially, 3.0 mg/l BA on MS medium was very effective in elongation of shoot. Root formation from in vitro growth of plant let was achieved on MS medium supplemented with 0.5 mg/l IBA. The results suggest that selection of plant growth regulator could be important factor to achieve an efficient in vitro growth.