• Applied Biological Chemistry
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• v.24 no.1
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• pp.74-83
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• 1981

Agricultural departmental curricular of the universities have been compared and analyzed with an exception of that of Chung Nam National University where agricultural chemistry department was established in 1979. The analysis reveals that major subjects covered by the undergraduate curricula of all the universities in agricultural cheimstry departments are in the fields of soil science, plant nutrition, agricultural chemicals, biochemistry, and fermentation technology or applied microbiology, although there are minor differences in curricula among universities. Besides, it must be pointed out that the ratio of students to teaching staffs, a significant index of the educational quality, is shown to be somewhat lower than expected for an appropriate college education. According to the analysis, the curricula of universities located in various areas in Korea do not show substantial differences among them, indicating that there is no locality. Thus, it may be recommendable to set up a unified curriculum of agricultural chemistry departments in Korea so as to achieve a balanced educational improvemet.

• Agribusiness and Information Management
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• v.3 no.1
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• pp.38-66
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• 2011

The dissemination process of agricultural research and development (R&D) results has somewhat different characteristics from that of typical R&D results. However, these characteristics are not adequately considered on the basis of an examination of the current performance system, the resulting management plans, and strategies for the application and dissemination of the results of agricultural R&D in Korea. The performance evaluation indicator exposed the problem of the inadequate consideration of the characteristics of each of these areas, particularly the lack of unified R&D-related institutions and the inadequacy of the system to monitor outcomes. To address these shortcomings in the agricultural R&D programs in Korea, the policies pertaining to agricultural R&D performance, results management, and dissemination in the U.S. and Japan were examined. Based on these investigations, we proposed strategies to improve the agricultural R&D policies in Korea.

• Korean Journal of Environmental Agriculture
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• v.25 no.3
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• pp.211-216
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• 2006

The present research was undertaken to investigate the activities of ligninolytic enzymes and dye-decolorization capabilities of white-rotting fungi Coriolus hirsutus LD-1. The isolated white-rotting fungi (Coriolus hirsutus LD-1) produced laccase (16,388.9 U/L) and manganese-dependent peroxidase (19.81 U/L) but it did not produce lignin peroxidase. When the isolated fungi was incubated with the treatment of dyes for 8 days, the rates of decolorization of remazol brilliant blue R and bromophenol blue were 70.2% and 98%, respectively. The activity for manganese-dependent peroxidase was low, whereas that for laccase was very high. Moreover, the laccase was more effective to decolor when compared to manganese-dependent peroxidase. The results suggested that laccase of Coriolus hirsutus LD-1 might be playing an important role in the decolorization of the dyes.

• Journal of Biosystems Engineering
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• v.38 no.4
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• pp.255-263
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• 2013

Purpose: It is not easy to drive a rice-transplanter avoiding underlapped or overlapped transplanting in paddy fields. An automated guidance system for the riding-type rice-transplanter would be necessary to operate the rice-transplanter autonomously or to assist the beginning drivers as a driving aid. Methods: A prototype of guidance system was composed of embedded computers, RTK-GPS, and a power-steering mechanism. Two Kalman filters were adopted to overcome sparse positioning data (1 Hz) from the RTK-GPS. A global Kalman filter estimated the posture of rice-transplanter every one second, and a local Kalman filter calculated the posture from every new estimation of the global Kalman filter with an interval of 200 ms. A PID controller was applied to the row-following mode control. A control method of U-turning mode was developed as well. A stepping motor with a reduction gear set was used to rotate the shaft of steering wheel. Results: Test trials for U-turning and row-following modes were done in a paddy field after some parameters have been tuned at the ground speed range of 0.3 ~ 1.2 m/s. The minimum RMS error of offset was 3.13 cm at the ground speed of 0.3 m/s while the maximum RMS error was 13.01 cm at 1.2 m/s. The offset RMS error tended to increase as the ground speed increased. The target point distance, LT also affected the system performance and PID controller parameters should be adjusted on different ground speeds. Conclusions: A target angle-based PID controller plus stationary steering angle controller made it possible for the rice-transplanter to steer autonomously by following a reference line accurately and even on U-turning mode. However, as condition in paddy fields is very complicated, the system should control the ground speed that prevents it from deviating too much due to ditch and slope.

• Animal Bioscience
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• v.35 no.10
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• pp.1575-1584
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• 2022

Objective: An experiment was conducted to evaluate the effects of partially replacing soybean meal (SBM) with sunflower meal (SFM) with added exogenous multienzymes (MEs) on various biological parameters in broilers. Methods: One week-old, 400 broiler chicks were randomly divided into four treatments (control, 3SFM, 6SFM, and 9SFM) with 5 replicates/treatment (20 chicks/replicate). Control diet was without SFM and MEs, while diets of 3SFM, 6SFM, and 9SFM treatments were prepared by replacing SBM with SFM at levels of 3%, 6%, and 9%, respectively, and were supplemented with MEs (100 mg/kg). Feeding trial was divided into grower (8 to 21 day) and finisher phases (22 to 35 day). External marker method was used to measure the nutrient digestibility. At the end of trial, twenty birds (one birds per replicate) with similar body weight were slaughtered for samples collection. Results: No significant effect of dietary treatments was found on all parameters of growth performance and carcass characteristics, except relative weight of bursa. Weight (25.0 g) and length (15.80 cm) of duodenum were significantly (p<0.05) higher in 3SFM than control. Lowest (p<0.05) villus height/crypt depth ratio was found in 3SFM and 9SFM than control. Most of meat quality parameters remained unaffected, however, highest pH of breast meat (6.16) and thigh meat (6.44) were observed in 9SFM and 3SFM, respectively. Lowest (p<0.05) cook loss of thigh meat was found in 6SFM (31.76%). Ileal digestibility of crude protein was significantly (p<0.05) higher in 3SFM (72.35%) than control (69.46%). In addition, amylase (16.87 U/mg) and protease (85.18 U/mg) activities were significantly (p<0.05) higher in 3SFM than control. However, cecal microbial count remained unaffected. Conclusion: Partial replacement (up to 9%) of SBM with SFM, with added MEs can help to improve the nutrient digestibility, intestinal morphology, and digestive enzyme activities without affecting cecal microbial count and growth performance in broilers.

• Korean Journal of Agricultural Science
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• v.24 no.2
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• pp.145-155
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• 1997

The large scaled field test by prefabricated vertical drains was performed to evaluate the superiority of vertical discharge capacity for drain materials through compare and analyze the time-settlement behavior with drain spacing and the compression index and consolidation coefficient obtained by laboratory experiments and field monitoring system. 1. The relation of measurement settlement($S_m$) versus design settlement($S_t$) and measurement consolidation ratio($U_m$) versus design consolidation ratio($U_t$) were shown $S_m=(1.0{\sim}1.1)S_t$, $U_m=(1.13{\sim}1.17)U_t$ at 1.0m drain spacing and $S_m=(0.7{\sim}0.8)S_t$, $U_m=(0.92{\sim}0.99)U_t$ at l.5m drain spacing, respectively. 2. The relation of field compressing index($C_{cfield}$) and virgin compression index($V_{cclab.}$) was shown $C_{cfield}=(1.0{\sim}1.2)V_{cclab.}$, But it was nearly same value when considered the error with determination method of virgin compression index and prediction method of total settlement. 3. Field consolidation coefficient was larger than laboratory consolidation coefficient, and the consolidation coefficient ratio($C_h/C_v$) were $C_h=(2.4{\sim}3.0)C_v$. $C_h=(3.5{\sim}4.3)C_v$ at 1.0m and 1.5m drain spacing and increased with increasing of drain spacing. 4. The evaluation of vertical discharge capacity with drain spacing from the results of the consolidation coefficient ratio showed largely superior in case the Mebra drain and Amer drain than other drain materials at 1.0m and 1.5m drain spacing, while the values showed nearly same value in case same drain spacing.

• 한국경영정보학회:학술대회논문집
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• 2007.11a
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• pp.553-558
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• 2007

본 연구는 인터넷 쇼핑 시 구매의도에 영향을 미치는 요인을 쇼핑가치와 신뢰의 관점에서 접근하였으며, 인터넷 구매 경험이 적은 그룹과 구매 경험이 많은 그룹을 구분하여 그 변화를 실증 분석하였다. 전체 204명의 표본을 구매경험이 적은 그룹(107명)과 구매 경험이 많은 그룹(96명)으로 나누어 PLS(Partial Least Square)를 통하여 분석한 결과 구매경험이 적은 그룹은 신뢰와 태도가 매개가 된 쾌락적 쇼핑가치가 큰 영향을 미치는 반면에 구매경험이 많은 그룹은 효용적 쇼핑 가치가 구매의도에 가장 큰 영향을 미치는 것으로 나타났다.

• Korean Journal of Soil Science and Fertilizer
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• v.5 no.2
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• pp.43-52
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• 1972

본실험은 유수형성기에 2일간 배수할 때 질소질 비료의 비종(유안과 요소) 및 시용시기(이앙기와 유수형성기)가 수도의 질소이용율에 미치는 영향을 보기 위해서 기후와 토양이 상이한 부산(동아대학교 농과대학 포장)과 서울(방사선 농학연구소 농장, 금곡)에서 농광 및 봉광 두품종을 사용해서 1970년에 실시 되었다. 유수 형성기에 2일간 배수하고 질소질 비료를 시용한 처리는 상시 담수구에 비해서 A-Value에 있어서 유의차가 없었으나 비료의 시용시기나 비종간에는 뚜렸한 차이가 있었다. 유수형성기에 추비하는것이 이앙기에 기비로서 시용하는 것 보다 자실에서 본 비료의 이용율이 4~5배 높았다. 자실의 질소함량은 봉광의 것이 실험지역에 관계없이 농광의 것보다 높았으며, 비료 이용율도 높은 경향을 나타내었다. 부산토양에서의 질소의 A-Value가 품종이나 비종에 관계없이 서울의것 보다 항상 높았던 것은 부산 토양의 질소함량이 높은데 기인하는 것으로 생각된다.

• Asian-Australasian Journal of Animal Sciences
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• v.14 no.9
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• pp.1342-1351
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• 2001

Over the years, the embryo transfer industry has grown from the simple collection & transfer of embryos into an advanced field of embryo biotechnology. Currently a large demand exists for bovine oocytes and early embryos in both research and commercial settings. Bovine embryos can now be produced in-vitro. Primary oocytes collected from antral follicles of abattoir - obtained ovaries can be induced to undergo the maturation process. In-vitor maturation system, however must ensure that the resulting oocyte is capable of undergoing normal fertilization and yields a zygote competent of developing to term after embryo transfer. Sperm preparation for IVF has improved with the use of heparine. The use of co-culture system has proved beneficial in circumventing the developmental block in IVM/IVF bovine embryos.

• Asian-Australasian Journal of Animal Sciences
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• v.6 no.1
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• pp.87-89
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• 1993

Cortisol levels in plasma are known to be as an indication of reproductive and adrenal status of an animal. In this study it has been examined in relation to the oestrus induction by Progesterone oestrogen therapy in 3rd and 4th parity anoestrus animals. Cortisol was found higher in treated animals and levels raised within 6-12 hrs. after hormone therapy followed by elevation in glucose levels and depletion of total serum proteins. It shows the association of induction, occurrence and expression of oestrus with energy demanding metabolic stress in buffaloes.