Overall 패턴의 적합성 연구(제2보)

徐美亞,曺承慧 服飾文化學會 1997 服飾文化硏究 Vol.5 No.2

貯水池 流域內의 河川 特性

徐承德,宋永立,千萬福 경북대학교 산업기술연구소 1990 産業技術硏究誌 Vol.18 No.-

The purpose of this study is to develop regression equation between physical characteristic factors of watershed of irrigation reservoirs(122 reservoirs), which are in operation for 3 to 65 years and have irrigation area equal to or larger than 200 has, located in South Korea are used in the analysis. The results obtained from this study are as follows. 1. In each province, the relationships between watershed area and main stream length, circumferential length, and number of streams, and that between main stream length and total tributary length have high correlation and high stastical significance. 2. It is found that the ratios of main stream length to circumferential length, total tributary length, and centroid length are 1:3, 1:3, and 1:0.5, respectively. 3. Watershed unit characterisitics are found that the shape factor of 0.44, the stream compactness of 0.79, the stream density of 1,63㎞/㎢, the stream frequency of 1.06piece/㎢, the relief factor of 45.6 m/㎞ and the average watershed altitude of 194.2m, respectively. The result of this study are useful for understanding correlation between watershed characteristic factors of reservoirs.

流出變化에 의한 背水現象 解析

徐承德,石基洪 慶北大學校 1985 農業科學技術硏究所報 Vol.2 No.-

Results investigated backwater phenomena at Geumho river basin to get a basic data for Daegu basin area development plan are as the follows. 1. It is a A=0.35 L 1.848 (r=0.97), the relationship between basin area and river length at Geumho river. 2. Dividing the rainfall of Geumho river basin as two parts, a first half rainfall and a second half rainfall, the amount of a first half rainfall appeared 57.5% comparison with total rainfall. 3. The maximum flood discharge appeared 12 hrs. continuous rainfall rather than 24 hrs. continuous rainfall. 4. Results investigated backwater phenomena from Geumho Ⅱ bridge to chungchun appeared the rising water level of 69cm, 55cm, 44cm, at section Ⅲ in the starting point water level of 1.8m, 2.4m, 4.0m respectively. 5. Results investigated backwater phenomena by the flood waterlevel appeared a similar form. There was a average rising waterlevle of 30cm at section Ⅲ. At the results of this computation, it was confirmed that section Ⅲ was affected the highest backwater phenomena among the observed river reaches in Geumho river. In addition, this paper should be given a assistance to decide a economic and safe section in construction of bank of river and estuary barrage.

河川의 取入水門設置에 依한 背水現象과 洪水 調節硏究

徐承德,金哲會,權武男 慶尙大學校 1972 論文集 Vol.11 No.-

Backwater curves were first applied to the long, smooth profile of the water surface upstream from a dam or other obstruction in a river channel. There are several methods for determining backwater curves in low-velocity river channels. Each of the methods is based on Bernoullis energy theorem and Mannings friction formula. The most common type of backwater Problems is the determination of water-surface elevations in a river channel upstream a station or Point to which the discharge and water-surface elevation are known. Flood routing identifies the procedure by which a flood discharge hydrograph at any point on the stream is determined from a known discharge hydrograph at some point upstream. It is generally necessary to use approximate flood-routing methods that either ignore some of the factors affecting flood wave movement or are based upon simplifying assumptions in regard to such factors. Of the many methods for the flood routing or storage analysis, the Muskingum method has mainly been applied to a natural river channel and the Modified Pul's method to a reservoir and weir respectively. In this thesis, Backwater and flood routing problems are analysed jointly. 1. Backwater curves at design water level 2.40m M.S.L. In case of natural river channel, the following theorem was applied ?? ?? ?? where Q=192.0 ㎥/Sec, A=300, 7㎡, R=2.65m, n=0.03 as the result, 18cm back water height was derived at the length of 5.3km, (refer to tablee 12). In case of intakegate established, Bresse formula was applied ?? ?? using the above, l=25,015.1-10,000h+?? was derived and 30.2cm of backwater height estimated at the length of 5.3km., In eventual, 2.2cm of backwater height difference between two cases were calculcted. 2. Flood routing at the design storage capacity of 1,964,950㎣(design water level of 2.40m M.S.L.) Discharge capacity of the Intakegate requires 36mins to drop the height of 2.40 M.S.L. to 0.75m M.S.L. at no rainy condition, and considering 220mm of maximum daily rainfall in flood time, 60mins were required to drop the gage height to the 0.75m M.S.L. During the control period of 60mins, the water level in each point was followings, Baikgoo: 2,415m M.S.L.(Lowest ground height: 2.52m) Banwol: 2.67m (2.72m) Masan: 2.60m (3.07m) Dodo: 2.91m (3.28m) Refering to the above results, a damage may not be met by those backwater curve and flood.

河川流域의 物理的 特性과 農業用 貯水池의 內容積變化와의 相關關係 硏究

徐承德 慶北大學校 1986 論文集 Vol.41 No.-

To understand the past sedimented and forthcoming sedimenting conditions in the reservoirs by the analysis of watershed physical characteristics, 27 reservoirs in Nakdong river system(Kyungpook) and 38 reservoirs in Yongsan river system(Jeonnam) and their watersheds were surveyed, studied and estimated under the condition of technique of field survey and measurement, data analysis, map study, analysis of reservoir-capacity changing curve, yearly accumulated sediment curve, storage & supply curve of reservoirs, inflow and outflow of river discharge and inlet condition of river bed. Through these analytical steps, general conditions of reservoirs and the capacity decreasing ratio, relations between watershed area and circumferential length of watershed area, river length and a number of rivers and relations between length of main river & length of total tributaries, relations between specific sediments and watershed area, circumferential length of watershed area, main river length and slope of main river length and slope of main rivers were derived. Those results should be applied effectively for the new design of reservoir prjoects, the management and operation of the existing reservoirs and the technical and scientific data to derive the relation between watershed physical characteristics and specific sediments of the agricultural reservoirs in Korea. Lastly, a number of problems dealing with the water management, conservation and its facilities were disclosed.

Pseudomonas sp. T-1에 의한 Terephthalic Acid의 분해

徐丞敎 대구산업정보대학 1997 논문집 Vol.11 No.2

It was found that the growth of strain T-1 after culture for 60hrs was increased according to the concentration of terephthalic acid up to 2% in the media. Degradation of terephthalic acid was confirmed with the UV scanning and HPLC during the culture of Pseudomonas sp.T-1 in the media containg 0.1% terephthalic acid. It was observed that 90~95% of chemical oxygen demand was eliminated after 5 days, when this strain was applied to the treatment of dye works wastewater whose terephthalic acid concentration was about 0.2% and COD_(Mn) was 1,620ppm by continuous culture with a hydraulic retention time of 37hr.

저 분극된 심근에 미치는 Vanadate의 효과

서성옥,방효원,조성일,엄대용,이상돈 중앙대학교 의과대학 의과학연구소 1987 中央醫大誌 Vol.12 No.3

Effects of vanadate on the isometric contraction, membrane potential and its maximal rate of depolarization of rabbit ventricular papillary muscles were recorded in normal Tyrode solution and 19mM K^+ Tyrode solution. Following results were obtained: 1. Vanadate increased the isometric contractions in normal Tyrode and 19mM K^+-Tyrode solution in a dosedependent manner. 2. Vanadate increased the duration and Vmax of slow action potential. 3. Vanadate induced slight hyperpolarization of unstimulated quit preparations in normal and high K^+-Tyrode solution. 4. Effects of vanadate which were observed in K^+-depolarized preparations were reversed by diltiazem, a calcium channel blocker. It could be conciuded that vanadate has positive intropic effect by increasing Ca-current in the papillary mucles of the rabbit.

MPEG-2 VBR 비디오 데이터의 트래픽 셰이핑

서덕영,장승기,경문현,박섭형 경희대학교 산학협력기술연구원 1996 산학협력기술연구논문집 Vol.2 No.-

This paper describes two traffic shaping methods for VBR(variable bit rate) video bit streams encoded in the MPEG-2 syntax. Difficulties in control of VBR video traffic are lessened by traffic shaping. Burstness of single layer MPEG-2 can be reduced by performing intra-refresh in more than one consecutive frames. In two layer encoding of spatial scalability, burstness can be reduced by setting the temporal locations of GOP starting frame of a layVBR 트래픽을 허용한다는 것이다. 모든 AAL er, differently from the other. Queueing analysis shows that these two methods outperform conventional encoding schemes in terms of temporal and semantic QoS requirements.

Overall 패턴 설계를 위한 기초 연구(제1보)

徐美亞,趙承慧 服飾文化學會 1997 服飾文化硏究 Vol.5 No.2

農業科學技術開發 및 普及의 投資效果分析

徐東均,鄭武男,閔勝奎 韓國農業政策學會 1994 농업경영정책연구 Vol.21 No.2