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Effect of Influent C/N Ratio and DO on Denitrification of Nitrate Polluted Groundwater in a Biofilter Process (Biofilter 공정에서 유입 C/N비와 DO가 지하수의 질산성 질소제거에 미치는 영향)

  • Lee, Moo-Jae;Park, Sang-Min;Park, Noh-Back;Jun, Hang-Bae;Kim, Kong-Soo
    • Journal of Korean Society of Environmental Engineers
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    • v.28 no.4
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    • pp.355-361
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    • 2006
  • In this study, effects of influent C/N(COD/Nitrate) ratio and dissolved oxygen(DO) concentration on biological nitrate removal from groundwater were investigated in the fixed-type biofilter. Influent nitrate of 30 mg/L was removed completely by biological denitrification at the C/N ratio of 10 and 4.0, while residual nitrate of 5 mg/L occurred at the C/N ratio of 2.0, which resulted from deficiency of organic electron donor. Furthermore, nitrite was accumulated up to about 5 mg/L as the C/N ratio decreased to 2.0. Increase in DO concentration also inhibited denitrification activity at the relatively high C/N ratio of 5.0, which decreased the nitrate removal efficiency. Although the influent DO concentration was reduced as low as 0.3 mg/L using sodium sulfite($Na_2SO_3$), effluent nitrite was up to 3.6 mg/L. On the other hand, nitrate was completely removed without detection of nitrite at the DO concentration of 0.3 mg/L using nitrogen gas($N_2$) sparging. The organic matter for denitrification in biofilter were in the range from 3.0 to $3.5gSCOD/g{NO_3}^--N$, while utilized these values increased at the high DO concentration of 5.5 mg/L. In addition to the high DO concentration and the low influent C/N ratio, DO control by chemical such as sodium sulfite affected on biological denitrification, which resulted in the reduction of nitrate removal efficiency and nitrite build-up in a biofilter.

Control Efficacy of Mixed Application of Microbial and Chemical fungicides against Powdery mildew of red-pepper (미생물 농약과 유기합성 살균제 혼용에 따른 고추 흰가루병 방제 효과)

  • Hong, Sung-Jun;Kim, Jung-Hyun;Kim, Yong-Ki;Jee, Hyeong-Jin;Shim, Chang-Ki;Kim, Min-Jeong;Park, Jong-Ho;Han, Eun-Jung;Goo, Hyung-Jin;Choi, Kwang-Young
    • The Korean Journal of Pesticide Science
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    • v.18 no.4
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    • pp.409-416
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    • 2014
  • This study was conducted to reduce the using amount of chemical fungicides for the control of red-pepper powdery mildew. Effect of combined application of three microbial fungicides and six chemical fungicides for the control of red-pepper powdery mildew was examined in vitro, in pot assay and under field condition. One chemical fungicide (Azoxystrobin+Chlorothalonil) among six chemical fungicides significantly suppressed three microbial fungicides (Bacillus subtilis Y1336, Bacillus subtilis DBB1501, Bacillus subtilis QST-713) registered for the control of pepper powdery mildew in vitro. In the pot assay, two mixed application such as B. subtilis DBB1501+Trifloxystrobin, B. subtilis QST713+Trifloxystrobin among nine mixed applications of three microbial fungicides and three chemical fungicides showed the highest suppressive effect against red pepper powdery mildew. Also, suppressive effect of the mixed application of B. subtilis QST713 and Trifloxystrobin was similar to that of single application of three chemical fungicides(Myclobutanil, Trifloxystrobin, Hexaconazole). In the field test, when the microbial fungicides (B. subtilis DBB1501, B. subtilis QST713) and the chemical fungicide (Trifloxystrobin) for the control of powdery mildew of red pepper were mixed foliar sprayed four times at 7 day-intervals, the control values were in the range of 70.3% to 70.9%. On the other hand, when each of the chemical fungicide (Trifloxystrobin) was foliar sprayed four times at 7 day-intervals, the control value was 72.7%. Consequently, the mixed application of the microbial fungicides and chemical fungicides could be recommended as a one of control measures for reducing the using amount of chemical fungicides.

A study on the Comparison of Cognition of Instruction Teacher and Student-teacher about Role of Industry Vocational Subject Educational Practice Instruction Teacher (공업계열 전문교과 교육 실습 지도 영역에 대한 지도 교사와 교육 실습생의 인식 비교)

  • Lee, Sang-Hyun;Lee, Byung-Wook
    • 대한공업교육학회지
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    • v.39 no.2
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    • pp.19-36
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    • 2014
  • The purposes of this study are to grasp industry vocational subject student-teachers' instruction area, compare cognitive level of cooperating teacher and student-teachers for the importance of instruction area and secure base data required to develop educational practical area of professional teachers in specialized high school. To achieve this, instruction area of instruction teacher in charge of industry vocational subject pre-teacher education was developed by document consideration and expert verification and differences of importance cognition for the area was compared between educational practice insturction teacher and student-teacher. The results are as the following. First, for the instruction areas that educational practice instruction teachers should teach student-teacher, there are 7 categories, 17 mid-fields and 85 subsections. Especially expert group suggested an opinion that areas of teacher's values and personality formation should be added to pre-teachers. And, they judged that category of school business showed low validity for educational practice instruction teacher's instruction area. Second, educational practice instruction teacher importantly cognized 'class activity', 'student instruction and class management' and 'development of desirable view of education attitude'. On the other hand, they cognized 'development and management of curriculum', 'support on educational activity', 'industrial-educational cooperation and tie with local community' and 'specialty improvement' less importantly. Student-teachers cognized 'class activity', 'student instruction and class management', 'specialty improvement', 'development of desirable view of education attitude' importantly. They cognized 'development and management of curriculum', 'support on educational activity' and 'industrial-educational cooperation and tie with local community' relatively less importantly. Third, both educational practice instruction teachers and student-teachers importantly cognized 'class activity', 'student instruction and class management' and 'development of desirable view of education attitude'. However, student-teachers importantly cognized, but educational practice instruction teachers didn't importantly cognized 'specialty improvement'. Both two group cognized 'development and management of curriculum', 'support on educational activity' and 'industrial-educational cooperation and tie with local community' less importantly.

Effect of Organic Acid on Value of VBN, TBARS, Color and Sensory Property of Pork Meat (유기산 처리가 돈육의 VBN, TBARS, 색깔, 관능적 특성에 미치는 영향)

  • Kang, S.N.;Jang, A.;Lee, S.O.;Min, J.S.;Lee, M.
    • Journal of Animal Science and Technology
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    • v.44 no.4
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    • pp.443-452
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    • 2002
  • The objective of this study was to evaluate the effects of concentration(0, 0.5, 1, 1.5 and 2%)of lactic, citric and acetic acid on chemical and sensory characteristics of fresh pork loins. The pork loins were sprayed with organic acid by a hand sprayer for 15 sec at 30$^{\circ}C$, packaged under air and stored for 14 days at 4$^{\circ}C$ and then during the storage time analyzed for VBN, TBARS, color and sensory property. All treated loins showed lower(p<0.05) VBN and TBARS values than the control's. Two percents of organic acid was the most efficient than the rest of treatments(p<0.05). All of pork loins that were sprayed with organic acids had higher CIE L*value(p<0.05) during storage. However, on 14th day, L* value of meat treated with lactic and acetic acid in 1.5 and 2% concentrations was not different from that of initial fresh loins(0 days). According to the results of sensory test, lactic acid, citric acid and acetic acid did not affected bloody and off-flavor of the meat for one day at 4$^{\circ}C$. While the acetic acid spraying resulted in the strong sour flavor of meat after one day.

A Study on Avant-Garde Fine Art during the period of Japanese Colonial Rule of Korea, centering on 'Munjang' (a literary magazine) (일제강점기 '전위미술론'의 전통관 연구 - '문장(文章)' 그룹을 중심으로)

  • Park, Ca-Rey
    • The Journal of Art Theory & Practice
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    • no.4
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    • pp.57-76
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    • 2006
  • From the late 1920s to the 1930s, Korea's fine art community focused on traditional viewpoints as their main topic. The traditional viewpoints were discussed mainly by Korean students studying in Japan, especially oil painters. Such discussions on tradition can be divided into two separate halves, namely the pre- and post-Sino-Japanese War (1937) periods. Before the war, the modernists among Korea's fine art community tried to gain a fuller understanding of contemporary Western modern art, namely, expressionism, futurism, surrealism, and so forth, on the basis of Orientalism, and borrow from these schools' in order to create their own works. Furthermore, proponents of Joseon's avant-garde fine arts and artists of the pro-fine art school triggered debate on the traditional viewpoints. After the Sino-Japanese War, these artists continued to embrace Western modern art on the basis of Orientalism. However, since Western modern fine art was regressing into Oriental fine art during this period, Korean artists did not need to research Western modern fine art, but sought to study Joseon's classics and create Joseon's own avant- garde fine art in a movement led by the Munjang group. This research reviews the traditional view espoused by the Munjang group, which represented the avant-garde fine art movement of the post-war period. Advocating Joseon's own current of avant-garde fine art through the Munjang literary magazine, Gil Jin - seop, Kim Yong-jun and others accepted the Japanese fine art community's methodology for the restoration of classicism, but refused Orientalism as an ideology, and attempted to renew their perception of Joseon tradition. The advocation of the restoration of classicism by Gil Jin-seop and Kim Yong-jun appears to be similar to that of the Yasuda Yojuro-style restoration of classicism. However, Gil Jin-seop and Kim Yong-jun did not seek their sources of classicism from the Three-Kingdoms and Unified Silla periods, which Japan had promoted as a symbol of unity among the Joseon people; instead they sought classicism from the Joseon fine art which the Japanese had criticized as a hotbed of decadence. It was the Joseon period that the Munjang group chose as classicism when Japan was upholding Fascism as a contemporary extremism, and when Hangeul (Korean writing system) was banned from schools. The group highly evaluated literature written in the style of women, especially women's writings on the royal court, as represented by Hanjungnok (A Story of Sorrowful Days). In the area of fine art, the group renewed the evaluation of not only literary paintings, but also of the authentic landscape paintings refused by, and the values of the Chusa school criticized as decadent by, the colonial bureaucratic artists, there by making great progress in promoting the traditional viewpoint. Kim Yong-jun embraced a painting philosophy based on the painting techniques of Sasaeng (sketching), because he paid keen attention to the tradition of literary paintings, authentic landscape paintings and genre paintings. The literary painting theory of the 20th century, which was highly developed, could naturally shed both the colonial historical viewpoint which regarded Joseon fine art as heteronomical, and the traditional viewpoint which regarded Joseon fine art as decadent. As such, the Munjang group was able to embrace the Joseon period as the source of classicism amid the prevalent colonial historical viewpoint, presumably as it had accumulated first-hand experience in appreciating curios of paintings and calligraphic works, instead of taking a logical approach. Kim Yong-jun, in his fine art theory, defined artistic forms as the expression of mind, and noted that such an artistic mind could be attained by the appreciation of nature and life. This is because, for the Munjang group, the experience of appreciating nature and life begins with the appreciation of curios of paintings and calligraphic works. Furthermore, for the members of the Munjang group, who were purists who valued artistic style, the concept of individuality presumably was an engine that protected them from falling into the then totalitarian world view represented by the Nishita philosophy. Such a 20th century literary painting theory espoused by the Munjang group concurred with the contemporary traditional viewpoint spearheaded by Oh Se-chang in the 1910s. This theory had a great influence on South and North Korea's fine art theories and circles through the Fine Art College of Seoul National University and Pyongyang Fine Art School in the wake of Korea's liberation. In this sense, the significance of the theory should be re-evaluated.

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Insecticidal activity of Diamondback Moth, Plutella xylostella against Bacillus thuringiensis and Neem oil (Bacillus thuringiensis와 Neem oil에 대한 배추좀나방의 살충활성)

  • Cho, Min-Su;Choi, Su-Yeon;Kim, Tae-Whan;Park, Chan;Kim, Dam-A;Kim, Young-Rim;Oh, Se-Mun;Kim, Sung-Woo;Youn, Young-Nam;Yu, Yong-Man
    • The Korean Journal of Pesticide Science
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    • v.13 no.4
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    • pp.315-324
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    • 2009
  • For the environmental friendly management of diamondback moth, Plutella xylostella (L.), Bacillus thuringiensis subsp. kurstaki ($30{\times}10^8\;cfu/mg$) and neem oil (0.5% azadirachtin) were used as green control agencies with mixed and alternative treatments on the chinese cabbage. When Bacillus thuringiensis subsp. kurstaki was applied to 1st and 2nd larva of P. xylostella with recommended concentration, their mortalities were reached to 100% by 2 days after treatment. In case of azadirachtin, its effect of mortality was continued for 7 days, and reached to 100% mortality. $LC_{50}$ values of Bacillus thuringiensis subsp. kurstaki and azadirachtin against 1st, 2nd, 3rd and 4th larva of P. xylostella were $2.8{\times}10^4$, $3.1{\times}10^4$, $3.4{\times}10^4$ and $1.5{\times}10^5\;cfu/ml$, and 2.7, 3.9, 4.7 and 7.1 ppm, respectively. The number of laid eggs of P. xylostella was reduced to 57.5 at 25 ppm of azadirachtin compared with control treatment. The hatch ratio was not significantly different with Bacillus thuringiensis subsp. kurstaki treatment in comparison with control treatment. However, when azadirachtin was applied, their hatch ratio were reduced to 25.8 and 45.4% at 25 and 50 ppm, respectively. On the other hand, emergence rate of eggs was not different with Bacillus thuringiensis subsp. kurstaki treatment, but 45.4% was shown in azadirachtin treatment with 50 ppm in comparison with control. When the mixture with Bacillus thuringiensis subsp. kurstaki and azadirachtin was applied to adults of P. xylostella, their mortality was higher than Bacillus thuringiensis subsp. kurstaki treatment only. These results are supposed that the mixture of Bacillus thuringiensis subsp. kurstaki and azadirachtin might be used as green control agents for reducing the demage of diamondback moth in the Chinse cabbage.

A Interpretation on Placeness and Historic Cultural Landscape of Dokjae-dong on Nogosan, Yangju (양주 노고산(老姑山) 독재동(篤才洞)의 장소성과 역사문화경관 해석)

  • Rho, Jae-Hyun;Kim, Hwa-Ok;Lee, Jung-Han;Park, Joo-Sung
    • Journal of the Korean Institute of Traditional Landscape Architecture
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    • v.33 no.1
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    • pp.97-109
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    • 2015
  • This study was focused on the placeness of Nogosan Dokjae-dong and rock inscription located in Jangheung-myeon, Yangju-si, Gyeonggi-do. The purpose was to reveal the implication of Nogosan and Dokjae-dong Valley in terms of Historic cultural landscape by considering the characteristics of the place and its landscape, and inferring the significance of the letters engraved on the rock. The result is as follows.10) Samgaksan is one of the five famous mountains in Korea. It is the sacred mountain that stands behind the capital city of the Joseon Dynasty that lasted for 600 years. On the other hand, the placeness of Nogosan is significant since it was the place where people used to bow low to the three great summits of Samgaksan. Furthermore, Nogosan was the perfect place to view Samgaksan that represented the Joseon spirit. Many letters were engraved on the rocks around Dokjae-dong Valley by Misu Heo Mok(許穆) as part of his memories to describe his experience in the mountain and became a scenery. Chusa(秋史) Kim Jung-Hee(金正喜) also engraved letters of 'Mongjae' on the rock that contains a double meaning. Literally, it means 'a dreaming house' However, it also implies that even just a daydream is significant in a way. These letters are presumed to be the signs that are related to Sung-Jae(性齋) Heo Jeon(許傳)'s experience in Dokjae-dong since the letters were part of his famous book title. Below these two letters, Chusa also engraved letters that describe the sexagenary cycle including the year of the rat, horse, dog, and tiger. They are regarded as the letters that describe the fate of Chusa's friend, a scholar born in May 1804. Nogosan and Dongjae-dong Valley are very significant in terms of historic cultural landscape as a viewpoint to see Samgaksan; and a place that cherishes the traces of Misu and shows common values and cohesiveness of well-known scholars of the Joseon Dynasty including Song Wol-Jae(松月齋) and Sung-Jae as a of Gihonamin(畿湖南人). The engraved letters of Chusa and Misu also implicitly demonstrates the major trends of Korea's calligraphy history.

Stability Test for the Cream Containing Chamaecyparis Obtusa Leaf Extract (편백나무 잎 추출물 함유 크림의 안정성 평가)

  • Lim, Myoung-Sun;Lee, Dong-Sook;Kwon, Soon-Sik;Park, Soo-Nam
    • Journal of the Korean Applied Science and Technology
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    • v.29 no.2
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    • pp.205-213
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    • 2012
  • In this study, the stability of cream containing the ethyl acetate fraction of C. obtusa leaf extract was evaluated. The pH, viscosity, and absorbance were measured under the 4 different temperatures (4, 25, 37 and $45^{\circ}C$) and under the sun light during the 12 weeks. The control cream without containing the extract did not show pH change under the different temperatures mentioned above. However, the pH of the cream with the extract was decreased 0.11 at $4^{\circ}C$ and $25^{\circ}C$. Under the $37^{\circ}C$, $45^{\circ}C$ and sun light condition, the pH was decreased 0.55, 0.84 and 0.59, respectively. After treating the cream for 12 weeks under the different temperatures, the viscosity was measured for the cream containing the extract and control cream. The values were decreased by 2,404 cPs in average compared to the initial value for the former and control cream were decreased by 1,296 cPs in average for the latter. On the other hand, the viscosity of control cream treated under the $45^{\circ}C$ for 12 weeks was decreased (1,915 cPs) relative to the cream containing the extract, which showed 3,810 cPs decrease in viscosity. The cream containing the extract did not show absorbance change at $4^{\circ}C{\sim}37^{\circ}C$ for 12 weeks. Instead, the absorbance of the cream treated under $45^{\circ}C$ and sun light condition was decreased 32.5 % and 35.2 %, respectively. This decrease in absorbance is relatively small compared to the 54.8 % decrease of the extract sampled from the cream using ethanol solution. This indicates that the extract is stabilized in the cream. In addition, any change in color or smell was not observed through 12 weeks of the experimental time period. Also physical changes as creaming and cohesion were not shown. The results show that the cream containing C. obtusa leaf extract was relatively stable. However, it is concluded that it is still not clear in the stability of the cream containing the extract when it is stored for a long time. Accordingly, it is suggested that further study is needed for the application of the extract to cosmetics.

Morphological Variations in Relation to Geographical Distribution of Pond Smelt, Hypomesus olidus Pallas (한국산 빙어의 지리적 형태변이에 대하여)

  • Ryu Bong Suk;LEE Kyung Ro
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.14 no.3
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    • pp.179-188
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    • 1981
  • The authors made an investigation concerning the geographical distribution and some major differentiations in morphological characteristics associated with the each habitat, of the pond smelt, Hypomesus olidus, which was introduced into Korea more than 50 years ago. Major characteristics utilized for the comparison study were upper jaw (maxillary), number of fin rays, scale structure, vertebral count, number of pyloric caeca, number of gill rakers, and the relative measurements of these and other internal characters. 1. The main areas of natural distribution are Paro Lake, Soyang Lake, Han River, Euirim Lake, and Ogjeong Lake (or Unam Lake) and the tributaries of these waters. 2. Morphological variations varied when the mean values of measurements from each area were compared with the standard measurement value by mosaic comparison, and in some instances a significant variation was found. 3. The most significant variations were found in the number of fin rays of pectoral and anal fins; the lengths from the tip of snout to the origin of pectoral fin, from snout to ventral fin, and from snout to anal fin, relative to standard body length; eye depth relative to head length; upper jaw: the number of pyloric caeca and the scale structure. Variations, on the other hand, by each habitat were not clear in the numbers of ventral and dorsal fin rays, gill rakers, vertebrae and lateral line scale : and the depth of caudal peduncle and distance from the tip of snout to the origin of dorsal fin relative to standard body length. 4. The scales of pond smelt showed some differences in the shape of scales, the shape and position of the focus and the number of ridges according to the scale positions on the body. No radii were present. The relations between longitudinal and transverse diameters of the scale suggest that the pond smelts of Soyang Lake and Un-am Lake are closely related, and those of Han River and Euirim Lake are also closely related. 5. The geographical variations in morphology of the pond smelt seem to have resulted from the variations in turbidity, water temperature, salinity (rather conductivity) and currents. 6. From the results obtained, it may be concluded that such factors as supramaxillary, relation between scale length and its breadth, number of caudal vertebrae and eye depth relative to head length may be used as the key characters for the classification of geographical varieties of Pond smelt.

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Radurization Effect of Korean Mackerel (한국산 고등어의 방사선 조사효과)

  • CHO S. J.;CHOE Y. K.;LEE S. Y.;BYUN S. M.;CHUNG J. R.
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.18 no.3
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    • pp.219-226
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    • 1985
  • To investigate potential application of radurization technique as an effective tool for controlling histamine accumulation, histamine contents were determined in fresh Korean mackerel meat samples irradiated at six dose levels of gamma radiation up to 1 Mrad during 35 day-storage at $0^{\circ},\;5^{\circ}\;and\;10^{\circ}C$. Total bacterial counts, total volatile bases and trimethylamine contents were also estimated. The minimum and maximum doses for Korean mackerel were determined to be 0.2 and 0.5 Mrad, respectively. Irradiation induced redening of fish muscle tissue and redening appeared to be dose dependent. At low doses, this redening contributed positively to the overall sensory qualities. At 0.5 and 1.0 Mrad, on the other hand, meat samples were excessively redened to the extent that red and white muscle layers were not readily distinguishable. No appreciable histamine accumulation occured during entire 35 day-storage in fresh mackerel meats, whether irradiated or not, when they were kept at ice temperature. At $5^{\circ}C$, histamine started to accumulate slightly during late storage in the samples irradiated at low doses. Even in the unirradiated samples, the histamine accumulation did not exceed the level of 10.0 mg per 100g meat until the 28th day at $5^{\circ}C$. At $10^{\circ}C$, however, histamine accumulation in the unirradiated was phenomenal from very early storage and the values reached 827.5 mg per 100g meat by the 35th day, while histamine accumulation in the irradiated was severely suppressed. Irradiation invariably brought about a significant reduction of initial microflora, disrupting normal spoilage pattern. This was reflected in the suppression of not only histamine but also total volatile bases and trimethylamine accumulation during post-irradiation storage at refrigerated temperatures.

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