• Proceedings of the Korea Water Resources Association Conference
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• 2005.05b
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• pp.449-453
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• 2005

하천의 물리적 생태적 특성에 대한 연구는 하천유형분류의 기초 자료로서 큰 의미가 있다. 그러나 국내의 경우 이를 위한 하천의 조사는 매우 드물며, 국부적이었다. 더욱이 이러한 생태적 물리적 특성을 근거로 한 하천 유형적 특성을 연구한 사례는 없었다. 본 연구에서는 하천의 유형을 분류하는 것은 아니지만 하천을 더욱 효율적으로 계획하고 관리하는데 필요한 기초자료를 구축하고자 하였다. 그리하여 1차적 연구로 자연환경이 유사한 하천들을 일시에 선정하여 동일한 방법으로 각 하천의 물리적 생태적 특성을 조사하고 평가하여 대상 하천의 공통적 특성을 가려내고자 하였다. 이와 관련하여 본 연구에서는 하천의 물리적 구조조사법을 유럽공동체에서 사용하는 기준과 방법에 따라 시범적으로 실시하여 국내하천의 하천환경조사를 위한 적용성 여부도 진단하고자 하였다. 하천의 물리적 구조등급이란 하천의 공간적 환경과 저수로 하상재료의 물리적 차이를 의미하는 것으로 하천 자체는 물론 하천범람지에 영향을 주는 생태적 기능의 수리 특성, 하천의 물리 특성, 수생태 특성 등을 포괄하게 된다. 따라서 하천의 물리적 구조등급은 하천구조의 생태적 질과 하천구조로 나타나게 되는 동적 과정(dynamic process)의 질을 평가하는 척도가 될 수 있다. 본 연구에서는 남한강수계의 청미천, 양화천, 복하천을 대상으로 물리적 구조조사법과 식생조사를 병행하였으며 이로부터 하천의 물리적 구조등급이 수질등급과 정량적이지는 않지만 전반적인 하천의 생태성 또는 자연도를 가늠할 수 있는 하나의 지료로 활용할 수 있음을 알 수 있었다.양토를 기준으로 할 때 강우량과 침투수의 관계는 $I_{10}(mm)=0.44R(mm)+5.8(r^2=0.55)$이었다. y절이 발생한 이유는 이전 강우에 의해 침투되고 있는 물이 있음을 함축하며 기울기 0.40은 강우의 $40\%$가 지하로 침투하였음을 의미한다. 침투수량은 토성별로 양토를 1.0으로 기준할 때 사양토가 1.12로 가장 컸고, 식양토 0.94, 식토 0.91로 평가되었다. 이는 토성간의 침투속도 및 투수속도의 경향이 반영된 것이다. 경사에 따라서는 경사도가 증가할수록 지수적으로 감소하였으며 $10\% 경사일 때를 기준으로 $I(mm)=I_{10}{\times}1.17{\times}e^{-0.0164s(\%)}$로 나타났다. 같은 조건에서 강우량과 유거수의 관계는 $Ro_{10}(mm)=5.32e^{0.11R(mm)}(r^2=0.69)$로 나타났다. 이는 토양의 투수특성에 따라 강우량 증가에 비례하여 점증하는 침투수와 구분되는 현상이었다. 경사와 토양이 같은 조건에서 나지의 경우 역시 $Ro_{B10}(mm)=20.3e^{0.08R(mm)(r^2=0.84)$로 지수적으로 증가하는 경향을 나타내었다. 유거수량은 토성별로 양토를 1.0으로 기준할 때 사양토가 0.86으로 가장 작았고, 식양토 1.09, 식토 1.15로 평가되어 침투수에 비해 토성별 차이가 크게 나타났다. 이는 토성이 세립질일 수록 유거수의 저항이 작기 때문으로 생각된다. 경사에 따라서는 경사

• Korean Journal of Medicinal Crop Science
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• v.5 no.3
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• pp.232-236
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• 1997

This experiment was conducted to determinate the optimum harvesting time of Carthami Flos and grain in safflower. In dry Carthami Flos yields harvested at different days after flowering, threre was no significant difference between 2 days and 4 days, however, yield harvested at 6 days was decreased significantly compared with 2 days after flowering. As the harvesting time were delayed, lightness (L') and redness (a') of dry Carthami Flos were decreased but yellowness (b') of that was increased. Color differences (${\Delta}E'ab$) of dry Carthami Flos between harvesting days after flowering were not visible between 4 days and 6 days but between those (4 days and 6 days) and 2 days were visible. As the result, the optimum harvesting time of Carthami Flos was 4 days after flowering. Grain yields and its components were affected by not harvesting Carthami Flos but grain harvesting time. Threre was no significant difference in number of grain per flower head, percentage of ripened grain between grain harvesting time. However, weight of 1000 grains and grain yields increased until 20 days after flowering. As a conclusion, the optimum harvesting time was 4 days after flowering for Carthami Flos and 20 days for grain regardless Carthami Flos harvesting time.

• Korean Journal of Medicinal Crop Science
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• v.18 no.4
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• pp.255-265
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• 2010

The extent of growth L. plantarum (LP), L. delbrueckii subsp. bulgaricus (LD), L. fermentum (LF), S. thermophilus (ST), B. longum (BI) and S. cerevisiae (SA) was generally good with the lower concentration of the ginseng extract. Total sapogenin content was slightly different with kinds of a fermentation microorganism and the time of fermentation process, and generally reduced compare to before fermentation. The content of ginsenoside Rb1, Rb2, Rb3, Re and Rf were decreased with the fermentation but ginsenoside Rd was increased by the E, LF and SA fermented extract. The content of compound K increased in the order of not-fermented extrac < enzyme fermented extract < enzyme and microorganism fermented extract, and as the fermented time get longer, the content of compound K was sightly increased. Especially, the content of compound K of the SA fermented extract was the most increased, also it of the BI, LD and LF fermented extract was increased, so these extract were considered a high valuable. Polyphenol content of the BI, LD, LP and ST fermented extract indicated $9.18{\pm}0.39{\sim}15.68{\pm}0.54$ mg/10 g which was lower than it of a not-fermented extract ($11.92{\pm}0.26{\sim}28.41{\pm}0.39$ mg/10 g). Flavonoid content of a ginseng fermented extract indicated $26.93{\pm}0.17{\sim}156.45{\pm}1.29$ mg/10 g, it was higher than a not-fermented extract ($18.06{\pm}0.90$ mg/10 g). As the fermented time get longer, the flavonoid content tendency to increase. DPPH radical scavenging activity of a fermented ginseng extract was $24.11{\pm}1.41{\sim}55.62{\pm}0.33%$, it was slightly lower compared to a natural antioxidant, vitamin C. But it of the LF and ST fermented extract was similar to a natural antioxidant, vitamin C. It has not a concerned in a fermentation. Nitrite scavenging ability of a 24 hr fermented extract was above 80% at pH 2.5 and 4.2, it was similar to an artificial antioxidant, BHT ($84.76{\pm}0.13%$; pH2.5, $84.98{\pm}0.11%$; pH 4.2). It has not a concerned in a fermentation. SOD-like activity of a fermented extract was lower than that of a not-fermented extract ($19.22{\pm}0.51%$), but it of the E and LP-fermented extract was a very highly notable value. As the fermented time get longer, the SOD-like activity tendency to increase.

• Korean Journal of Materials Research
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• v.18 no.9
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• pp.475-481
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• 2008

Positive temperature coefficient of resistivity (PTCR) characteristics of (1-x)$BaTiO_3-x(Bi_{0.5}K_{0.5})TiO_3$ ceramics doped with $Nb_2O_5$ were investigated in order to develop the Pb-free PTC thermistor available at high temperatures of > $120^{\circ}C$. The PTCR characteristics appearing in the ($B_{i0.5}K_{i0.5})TiO_3$ (< 5 mol%) incorporated $BaTiO_3$ ceramics, which might be mainly due to $Bi^{+3}$ ions substituting for $Ba^{+2}$ sites. The 0.99$BaTiO_3-0.01(Bi_{0.5}K_{0.5})TiO_3$ ceramics showed good PTCR characteristics of a low resistivity at room temperature (${\rho}_r$) of $31{\Omega}{\cdot}cm$ a high ${\rho}_{max}/{\rho}_{min}$ ratio of $5.38{\times}10^3$, and a high resistivity temperature factor (${\alpha}$) of $17.8%/^{\circ}C$. The addition of $Nb_2O_5$ to 0.99$BaTiO_3-0.01(Bi_{0.5}K_{0.5})TiO_3$ ceramics further improved the PTCR characteristics. Especially, 0.025 mol% $Nb_2O_5$ doped 0.99$BaTiO_3-0.01(Bi_{0.5}K_{0.5})TiO_3$ ceramics exhibited a significantly increased ${\rho}_{max}/{\rho}_{min}$ ratio of $8.7{\times}10^3$ and a high ${\alpha}$ of $18.6%/^{\circ}C$, along with a high $T_c$ of $148^{\circ}C$ despite a slightly increased ${\rho}_r$ of $31{\Omega}{\cdot}cm$.

• Science of Emotion and Sensibility
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• v.9 no.1
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• pp.39-48
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• 2006

This study was carried out to investigate sound sensation of Korean traditional silk fabrics with similar sound pressure levels (SPL) and to identify secondary physical factors excluding SPL which determine sound sensation of the fabrics. Sounds of the silk fabrics tended to be perceived differently from one another as for some of sensation such as clearness ant roughness. They were felt more strongly in aspects of loudness, roughness, and highness than of softness, sharpness, clearness, and pleasantness. Subjective clearness, roughness, and highness were significantly correlated with some of sound parameters including roughness(z), ${\Delta}L,\;and\;{\Delta}f$. Especially, both of clearness and roughness which were varied among the fabrics were found as determined by ${\Delta}L$. This result means that ${\Delta}L$ as well as roughness(z) and ${\Delta}f$ could be utilized secondary to SPL in order to satisfy some of human sensibility for sound from traditional silk fabrics without variation of physical loudness.

• Culinary science and hospitality research
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• v.17 no.3
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• pp.132-140
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• 2011

The objective of this study is to evaluate the quality characteristics of turmeric powder Dasik, a Korean traditional cookie, prepared by different additions of turmeric powder(0%, 1%, 2%, 3%, 4%). The result of the study is as follows. As the level of turmeric powder in the formulation increased, the moisture contents of the samples increased. As the content of the turmeric powder increased, the L-values of the turmeric powder Dasik significantly decreased, and the a- and b-values also significantly increased. Also, the hardness, gumminess, springiness, cohesiveness and chewiness of the turmeric powder Dasik increased, whereas its adhesiveness decreased as the amount of turmeric powder increased. The sensory evaluation results showed that the 2% turmeric powder sample showed the highest preference scores; therefore, the 2% turmeric powder Dasik prepared with 98g of flour, 2g of turmeric powder, and 80g of honey was chosen as the most preferred product. It is expected that the development of Dasik added with functional food such as turmeric powder can influence the use of turmeric and increase the consumption of Korean traditional cookies.

• Culinary science and hospitality research
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• v.17 no.3
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• pp.172-180
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• 2011

This study explores the quality characteristics of white pan bread added with perilla leaf powder, and the results are as follows. The WRC(water retention capacity) of PLP (perilla leaf powder) added to the bread dough increased as the addition increased, and the initiation temperature during the rapid visco analysis (RVA) increased with more additions, showing significant differences. The highest and the lowest viscosity of the sample decreased as the powder added increased. The brightness(L value) of the bread without the powder was the highest, and the redness (a value) and the yellowness (b value) showed significant differences among the samples. Hardness increased showing significant differences among the samples as the powder added increased Chewiness was the highest but preference value was the lowest in the sample with 7% of the powder. The lowest score was shown in the color of the sample with the most PLP added. Flavor was the lowest of 4.93 in the comparison sample without the leaf powder added while bitter taste scored the highest of 5.21 in the sample of 3% powder added. It was also the highest in overall acceptance while the sample with the most powder showed the lowest of 4.03. From these results, it can be said that the preference of bread with PLP seems to decrease when more than 5% of PLP is added.

• Culinary science and hospitality research
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• v.17 no.3
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• pp.181-190
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• 2011

This study analyzed the quality characteristics of the Sansapyun products, which were manufactured by mixing with 0, 5, 10, 20, and 30% of Crataegi fructus concentrate and 9% of mung bean starch. The moisture content and pH in Sansapyun decreased significantly(p<0.001) as the concentration of Crataegi fructus concentrate increased. Sweetness increased as the amount of Crataegi fructus concentrate increased in both Before/After cases. As for the L value of the color characteristics of Sansapyun, it turned out that the control group, which had 0% of Crataegi fructus concentrate, was higher. Meanwhile, the a and b values were the strongest with 30% of Crataegi fructus concentrate. As the concentration increased, the hardness, springiness, chewiness, gumminess, cohesiveness all decreased significantly(p<0.001), while adhesiveness became higher as the concentration increased. The preference test showed that the increase of the concentration resulted in the increase of red color, fruity flavor, sour flavor, Chinese (herb) medicine flavor, sour taste, sweetness, Chinese (herb) medicine taste, stickiness, and aftertaste. However, the sleekness, transparency, hardness and springiness decreased as the concentration increased. The survey on the preference showed that the preferences for flavor, taste and overall preference were the highest at the 10% sample group, but the preferences for color and texture were the highest at the 20% sample group.

• Korean Journal of Weed Science
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• v.17 no.2
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• pp.139-146
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• 1997

The experiment was conducted at Gyeongbuk Provincial Rural Development Administration in 1996 to obtain basic information on weed ecology and effective weed control in direct-seeded rice fields under different seeding types and seeding times. A large number of upland weeds such as Echinochloa crus-galli, Digitaria sanguinalis, Capsella bursa-pastoris and Stetaria viridis etc occurred at early growth stage, while Eleocharis kuroguwai, Aneilema keisak and Cyperus serotinus dominated at late stage in dry seeded rice field. In wet seeded rice field, the dominance of E. crus-galli was lower and the occurrence of M. vaginalis and A. keisak were higher than in dry seeded field. Amount of weed occurrence in dry seeded field was 1.8 to 2.4 times greater than in wet seeded field and it increased with delaying seeding time. Increasing rate of weed occurrence through whole life cycle was the highest at 20 days after seeding (DAS) to 40 DAS, regardless of seeding types and seeding times. Simpson index in wet seeded field was higher than in dry seeded field and it gradually increased as growing of dominant species. For F-value test, it was recognized as statistical significant in seeding types, seeding times and interaction of two factors.

• Journal of Chest Surgery
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• v.23 no.2
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• pp.213-221
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• 1990

We have experienced 62 cases of modified Fontan operations in Seoul Nat’l University Hospital from Apr. 1986 to Jul. 1989, They were 38 males and 24 females, and their age was ranged from 16 months to 15.5 years of age. [mean age : 5.73$\pm$2.99 years] There were 16 operative deaths and 2 late deaths, therefore 29% of overall mortality. Their diagnoses were as follows; 28 single ventricle, 11 tricuspid atresia, 6 DORV with LV hypoplasia, 3 pulmonary atresia with hypoplastic RV, 3 TGA with hypoplastic RV, 3 cor\ulcornerGA with hypoplastic LV and PA, 6 AV canal defects with PA, and 2 others. Low cardiac output and pleural effusion were developed frequently, so we divide 40 patients into some groups to analyze the physiologic and anatomic causes of them. By the degree of the LCO, group A was no LCO[mean amount of inotropics used: 0-5 \ulcornerg/kg/min] with 17 cases, B mild LCO [5-10] with 11, C moderate to severe LCO but alive[>10] with 8, D severe LCO to death with 4 cases. For the pleural effusion, group 1 was to be removed the chest tube within 1 week with 8 cases, group II within 3 weeks with 21 cases, group III beyond 3 weeks with 12 cases. We considered their age, diagnosis, pulmonary artery size[PA index], pulmonary artery abnormality, palliative shunt, systemic ventricular type, pulmonary artery wedge pressure, as preoperative factors, and operative methods, and as postoperative factors, CVP, LAP, arrhythmia, thrombosis, atrioventricular valvular insufficiency, etc. In the view of LCO, pulmonary artery size and PCWP were statistically significant [P<0.05], and arrhythmia, A-V valve insufficiency were inclined to the group C and D Pleural effusion was influenced by the pulmonary artery size, pulmonary artery resistance, PCWP, and CVP significantly. [P<0.05] And arrhythmia, residual shunt, and A-V valvular insufficiency were inclined to group II and III, too. As a results, the followings are to be reminded as the important factors at the care of post-Fontan LCO, and persistent pleural effusion [1] pulmonary artery size, [2] pulmonary artery resistance, [3] PCWP, [4] CVP, [5] arrhythmia, [6] residual shunt, [7]A-V valvular insufficiency.