• Journal of Power System Engineering
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• v.5 no.3
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• pp.73-79
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• 2001

The purpose of this investigation is experimentally to clarify the machinability and tool wear of STS 304 steel pipe material for piping. In order to determine the effects of cutting parameters and tool wear on thrust, torque, AE RMS, drilling is conducted on CNC milling machine. In this experiment, it is measured that thrust, torque, tool wear length, tool wear area and AE RMS during drilling using Hss tool. It has been found that a) During the drilling, the thrust and the torque of the STS 304 pipe are received more the effect of the feed than the spindle speed and the thrust increase with the increase of feed, b) The value of the AE RMS is been larger the effect of the cutting speed than the feed rate, and the value of the AE RMS increase with the increase of spindle speed, c) It has been found that the suitable feed in feed condition of 0.03, 0.05, 0.1, 0.15mm/rev is below 0.05mm/rev, d) The value of the AE RMS was shown a characteristic of the jump value during it was a sudden inrcrease of the tool wear. The increased character of the AE RMS value can be known an effective factor of the tool wear detection, and e) It can be quantitatively evaluated the condition of the tool according to calculate a area of the drill wear image which is obtained by a vision system.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.3 no.3
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• pp.172-176
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• 1970

This research dealt with the nutrient value of the seaweed, Sargessum horneri (Turner) C. Ag. which showed the highest nutrient value in the previous exporiment (Park 1968). Its objective was to find the most effective mixing ratio of ordinary chicken feed used for pullet. In order to investigate the most effective mixing ratio, seven kinds of sample feed with vary-ing amounts of the seaweed as shown in table 2 were prepared and were fed to seven groups of chickens, each group consisting of twenty, four week old, pullets. In addition, the effect of sodium glutaminate mixed in the feed was also investigated, and the following result was obtained. The average increase in body weight of each group during the experiment period was determined. The group fed with the feed containing $10\%$ powdered Sargassum horneri (Turner) C. Ag. showed the highest body weight increase. In this experiment the body weight increase was accelerated by mixing $0.5\%$ sodium glutaminate In the above feed.

• Journal of environmental and Sanitary engineering
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• v.13 no.2
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• pp.82-87
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• 1998

The opening temperature of emit heat, caloric value and decomposition hear were investigated by DSC & TGA in order to find the hazard of sanitary feed-stuff, also explosion hazard of dust was observed with electrical ignition after fodder dispersion by compressed air. Then opening temperature of emit heat of supporting gas. $O_{2}$ was much lower than inert gas. Ar. and caloric value increased 20. and the particle size of sanitary feed-stuff were appeared fire or explosion at 50/60 mesh and 60/80 mesh.

• Proceedings of the Korean Society of Crop Science Conference
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• 2022.10a
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• pp.144-144
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• 2022

The amount of required forage is increasing by 20% every year in South Korea, but the cultivation area for forage production is limited. The yield ability of triticale forage is the highest among the winter forage crops including rye and the crop has cold tolerance within the average low temperature of -10℃ in January. Therefore, this study analyzed effects of sowing and harvesting times on feed value and quality for efficiently using and supplying triticale as livestock feed. Seed of the triticales, 'Joseong' was sown in 2021 fall (October) and 2022 spring (March). The triticales were harvested according to growth stages: seedling stage, booting stage, heading stage, 10 days after heading, and 20 days after heading. Moisture contents of each harvested triticales were adjusted to about 60%, and then the triticales were fermented for 40 days at room temperature under anaerobic conditions as silage. We have analyzed pH and organic acid to determine the feed value and quality of each silage. The contents of lactic acid in silage ofthe triticale harvested at the seedling stage of both fall and spring-sown (1.61%, 1.63%) were the highest among all of the silages; the booting stage (0.75%, 1.33%), the heading stage (0.50%, 0.69%), 10 days after the heading stage (0.31%, 0.42%), and 20 days after heading stage (0.22%, 0.40%). Such as the contents of lactic acid in the silages, and the pH value of the silages The pH value in both the fall- and spring-sown became lower as the triticale was grown up: seedling stage (7.05, 6.85), booting stage (6.21, 6.75), heading stage (6.18, 6.28), 10 days after heading stage (6.22, 6.17), and 20 days after heading stage (6.15, 5.81). Taken together, the results showed that the feed value and quality of triticale silage were more affected by harvesting time than sowing time.

• Applied Biological Chemistry
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• v.27
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• pp.18-28
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• 1984

In order to improve feed values of Korean agricultural by-products, various treatments including physical, chemical, physicochemical and fermentation were suggested in th is review article. Physical treatments such as chopping, grinding and pelleting reduce partiole size of agricultural by-products, and increase passage rate from the rumen, thus may increase voluntary feed intake and weight gain. Digestibility and voluntary feed intake of straw, rice hull and sawdust, also, may be increased by chemical treatment using sodium hydroxide or ammonia. Especially, because nitrogen content of by-products increase and toxic problem is not posed by ammonia treatment, it's practical usage is recommended in Korea. Silage or fermentation treatment using principles of microbial fermentation may improve palatability of low quality by-products. As mentioned above, it is concluded that various treatments suggested are desirable and improve feed value but may raise several problems. Unfortunately, because cost for installation and products is great and processing work is complicate, farmers are not using well these processing methods until now. Therefore, in order to increase the practical usage at farm level, it is thought that many research works be achieved for efficient process which have simple operation and low installation cost.

• Journal of Korean Society of Water and Wastewater
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• v.21 no.6
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• pp.717-726
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• 2007

Fully-grown flocs in a mixing tank of membrane filtration with dead-end membrane are ruptured while passing through a pump and the ruptured flocs are aggregated again in a Membrane-Feed-Pipe (MFP). To look at more details, this study tries to relate the reaggregation to a parameter of mixing intensity in MFP, i.e., G-value. The G-value is a function of Reynolds number, pipe diameter, friction factor and average velocity in MFP. To deal with polydispersity condition, we develop a representative particle size called in this study EDPD (Effective Diameter for Polydispersity condition in Dead-end filtration). The experimental results show that as the G-value increases, the EDPD decreases and also the cake resistance increases. Through comparison between EDPD and cake resistance, these results show that cake resistances are controlled by reaggregation phenomenon in MFP. The effect of detention time in MFP, however, does not affect the reaggregation of the broken flocs as G-values are increased.

• Asian-Australasian Journal of Animal Sciences
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• v.6 no.3
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• pp.367-371
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• 1993

The feeding value of maize cob meal was investigated in a trial involving one hundred and forty Arbor Acre day-old chicks raised to eight weeks of age. The maize cob meal which contained 32.5% fibre, 2.5% protein and had a gross energy value of 2,550 kcal/kg, was incorporated into the experimental diets at either 0, 2.9, 5.8, 11.6 or 23.2% level. All diets were formulated to contain 3,200 kcal/kg of metabolizable energy and approximately 22% protein by varying the proportions of maize and whole cooked soyabean meal in the diets. The inclusion of maize cob meal up to 11.6% in the diet did not significantly (p>0.05) affect body weight gains, feed consumption and utilization, as well as carcass yield and dressing percentage. However, at the 23.2% level of maize cob meal inclusion, body weight gains, feed utilization and carcass yields were significantly (p<0.05) reduced. The use of maize cob meal reduced feed cost for raising birds and either maintained or improved gross profit returns with up to 11.6% level of inclusion in the diet. It was concluded that maize cob meal can be included up to 11.6% in the diet of broiler chickens provided dietary energy concentration is maintained at 3,200 kcal of metabolisable energy per kilogramme of feed by using high energy density feed ingredient such as boiled whole seed soyabean meal.

• Asian-Australasian Journal of Animal Sciences
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• v.16 no.1
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• pp.116-123
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• 2003

Forages are the most important feed resource for ruminants worldwide, whether fed as pastures, forage crops or conserved hay, silage or haylage. There is large variability in the quality of forages so measurement and prediction of feeding value and nutritive value are essential for high levels of production. Within a commercial animal production system, methods of prediction must be inexpensive and rapid. At least 50% of the variation in feeding value of forages is due to variation in voluntary feed intake. Identification of the factors that constrain voluntary feed intake allows these differences to be managed and exploited in forage selection. Constraints to intake have been predicted using combinations of metabolic and physical factors within the animal while simple measurements such as the energy required to shear the plant material are related to constraints to intake with some plant material. Animals respond to both pre- and post-ingestive feedback signals from forages. Pre-ingestive signals may play a role in intake with signals including taste, odour and texture together with learned aversions to nutrients or toxins (post-ingestive feedback signals). The challenge to forage evaluation is identification of the factors which are most important contributors to these feedback signals. Empirical models incorporating chemical composition are also widely used. The models tend to be useful within the ranges of the datasets used in their development but none can claim to have universal application. Mechanistic models are becoming increasingly complex and sophisticated and incorporate both feed characteristics and use of biochemical pathways within the animal. Improvement in utilisation through the deliberate selection of pasture plants for high feeding value appears to have potential and has been poorly exploited. Use of Near Infrared Reflectance Spectroscopy is a simple method that offers significant potential for the preliminary screening of plants with genetic differences in feeding value. Near Infrared Reflectance Spectroscopy will only be as reliable as the calibration sets from which the equations are generated.

• Korean Journal of Organic Agriculture
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• v.17 no.3
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• pp.347-356
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• 2009

In attempt to select the most appropriate forage legume species, this study was conducted on the 10 forage legume crops suitable for the central region of Korea and investigated their productivity, feed values and stock carrying capacity. In the results, red clover showed fresh matter yield 38.6 ton/ha, dry matter yield 7.8 ton/ha, crude protein yield 1.0 ton/ha, total digestible nutrients(TDN) yield 4.6 ton/ha, its fresh matter yield, dry matter yield and nutrient yield were significantly(p<0.05) higher than other species. The value of neutral detergent fiber(NDF) and acid detergent fiber(ADF) were getting higher by the late harvest time then galega and cicer milkvetch were the highest and yellow suckling clover was the lowest value. Relative feed value(RFV) showed good feed values above 100 except cicer milkvetch and galega. In terms of feed grading, yellow suckling clover, yellow blossom sweet clover, crimson clover, hairy vetch were classified into 1st grade, above 151%. The average stock carrying capacity was yet high Kcp(2.18 head/ha/yr), KTDN(1.25 head/ha/yr) and K(0.04 head/ha/yr). Especially, red clover had the highest stock carrying capacity, Kcp 6.84 head/ha/yr, KTDN 3.64 head/ha/yr and K 0.05 head/ha/yr. According to results, red clover is considered to be the most appropriate crops for the central region, in terms of quality, feed value and stock carrying capacity.

• Korean Journal of Agricultural Science
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• v.2 no.1
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• pp.241-255
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• 1975

This experiment was conducted to observe the effects of fermented feed by Aspergillus oryzae and Aspergillus niger on the improvement of feed value and the effect of fermented feed additive for meat production of broiler. The results of fermented feed on the improvement of feed value were as follows; I; The effects of fermented feed value improvement were as follaws; 1) There were little difference between fermented feeds by Asp. oryzae and Asp. niger, compared with wheat bran, crude protein contents of Koji was highly increased and its nitrogen free extract and crude fat contents were decreased, but crude fiber and ash were little difference. 2) Total amino acids were highly increased as to fermented feeds but proline in Asp. niger koji feed, and proline and valine in Asp. oryzae koji feed were decreased and other amino acid were increased 2) The effect of fermented feeds on meat production of broiler were as follows; 1) Fermented feeds groups appeared higher weight (p<0.01)than weight of control on end of experimental period, but little difference were recognized between 5% and 10% fermented feed groups. 2) On the weight gain per day, highly significant were recognized(p<0.05) between control and test groups, 10% Asp. oryzae koji group was highest ($12.15{\pm}0.46g$) between all groups. 3) On the yield of carcass, there were significant highly difference (p<0.01) between control and test groups but little difference were recognized between each of 5% groups and 10% groups of fermented feeds. 4) Fermented feed groups appeared higher carcass yield (p (0<0.05) than control. But between all fermented feed groups were a little difference in partly. 5) On the influence of fowl meat composition, amount of moisture contents was a little decrease in fermented feed groups, and crude protein and crude fat were increased. 6) Feed conversion rate resulted a little amount decreasing. Specially, 10% Asp oryzae koji group was lowest (2.89) compare with control (3.35) 3. As a result of economical analysis appeared highest low income in koji groups. Low income were more gained percent of 40.22 in 10% Asp oryzae koji and 33.19 in 10% Asp. niger koji than control.