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Al 탈산강의 Ca 첨가에 의한 비금속개재물의 형태제어
이원재,김경식,심재동,윤종규 대한금속재료학회(대한금속학회) 1983 대한금속·재료학회지 Vol.21 No.6
In order to clarify the shape control mechanism of nonmetallic inclusions in molten steel, the morphology changes of oxide and sulfide inclusions were investigated by Ca treatment in Al-deoxidized steel at 1600℃. The Ca addition of suitableamount into Al-deoxidized steel considerably improved the degree of steel cleanliness because the alumina cluster formed after Al-deoxidization changed to liquid phase calcium-aluminates which float out rapidly from steel bath. And also, when total oxygen content in molten steel was less than about 20ppm, MnS sulfide and Al₂O₃oxide were modified to C type inclusions such as (Ca, Al, Mn) O-(Ca, Mn) S or CaO-Al₂O₃-CaS
이원재,김재성 한국문화공간건축학회 2016 한국문화공간건축학회논문집 Vol.- No.53
The research is for the purpose to provide information about how to design a hospital for optimized daylight by analyzing recent hospital cases where adopted daylight design. The research method is investigating the plan types of four healthcare cases where daylight designs were adopted. Based on the information about floor and elevation of four different spaces in the hospitals as places mainly considered applying daylight (patients room, waiting area, nursing station, lobby), hospital spaces are studied and compared by analyzing window size, window direction, daylight window ratio, and method of daylight design. The research conclusion is as follows: 1) A patient room faces south as possible. 2) A floor type of patient room has been changed from a simple plan like triangle and rectangle to a staggered plan being complicated. 3) Window size became bigger and the bottom line of window frame got lower closed to the ground level for maximized daylight. 4) A number of private patient rooms have increased and the importance of daylight is emphasized in the elevation plan. 5) The repeat and horizontal types of patient rooms’ window that used in the past hospital design have been changed into window facade and curtain wall types of windows to consider daylight as one of the design factors.
해양세균이 적조형성 생물에 미치는 역할 : 1. 진해만의 해양세균과 와편모조류(渦鞭毛藻類)의 분포
이원재,박영태,김학균,성희경 한국수산학회 1990 한국수산과학회지 Vol.23 No.4
海洋細菌이 赤湖形戚 生物에 미치는 역할을 알기 위하여, 일차적으로 진해만에 분포하고 있는 細菌을 分離同定함과 동시에 渦鞭毛藻類의 群集을 조사한 결과는 다음과 같다. 分離同定한 總菌株數는 251菌株로 Flavobacterium spp.가 26菌株, Acinetobacter spp.가 18菌株였으며 優占種은 계절별로 다르게 나타났다. 한편 光合成細菌은 약 13%인 32菌株가 分離되었으며, 이들은 Erythrobacter longus, Erythrobacter sp.(J-2) 및 Erythrobacter sp.(J-8)의 3종으로 同定되었다. 渦鞭毛藻類 群集은 14屬 29taxa로 구성되었으며, 出現量은 9월에 4,699cells/㎖로 가장 많고 4월에 36cells/㎖로 가장 적었다. 優占種으로 8월에 Gymnodinium sanguineum, 9월에는 Prorocentrum micans, P. minimu, 10월에는 Ceratium fussus 그리고 4월에는 Heterocapsa triquetra였다. 한편 8, 9월에는 주로 馬山灣과 鎭海灣 西部沿岸에서 赤潮現象이 발생하였다. 水質富營養指標成分인 DIN과 DIP는 赤潮發生條件(水質2級基準에 해당)인 7.14㎍-at/ℓ와 0.48㎍-at/ℓ를 대부분 초과하였으며, COD는 富營養 또는 過營養水域에 해당되었고 하계 底層水에서는 貧酵素狀態를 나타냈다. To provide essential information of the role of marine bacteria on the dinoflagellate blooms, distribution of marine bacterial flora and dinoflagellate species was investigated in Chinhae Bay located in southern part of Korea from August 1989 to April 1990. Two hundred and fifty one strains of marine bacteria were isolated from seawater samples collected from the study area. Among them, Flavobacterium spp. and Acinetobacter spp. were the most dominant in bacterial flora. Another 32 strains which comprised 13 percent of total strains were Erythrobacter spp.. Based on the physiological character, Erythrobacter spp. were identified as Erythrobacter longus, Erythrobacter sp.(J-2) and Erythrobacter sp. (J-8). From the phytoplanktonic community, fourteen genera and twenty nine taxa of dinoflagellate species were identified. Based on the spatio-temporal frequence and abundance Gymnodinium sanguneum, Prorocentrum micans and Prorocentrum minimum were the aestival dominent species. However, Heterocapsa triquetra was appeared as predominant species in April. Cell density of about 2,000 cells/㎖ was prevailed in the bloom of August, but it developed into more intensive bloom of above 500 cells/㎖ in September. The water quality showed eutrophic or hypereutrophic condition, which was proved by high concentration of dissolved inorganic nitrogen, ortho-phosphate and chemical oxygen demand. Oxygen deficient water mass was found in the bottom overlying waters in August and September. High relationship between abundant bacterial flora and persistent dinoflagellate blooms in eutrophic condition would be approvable.