• Plant Resources
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• v.7 no.2
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• pp.110-115
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• 2004

This study was conducted to evaluate the effect of herbicides on weed control, growth characteristics and yield in flax, after direct seeding it to the field, the herbicides treated had no effect on the emergence period. The major weeds were decreased some what more with mecoprop-wp, herbicide than the other herbicides and by hand weeding. Mecoprop-wp and simazin-wp were had no injury but sethoxydim-EC and 2.4-D-wp were slighthy harmful for the flax with recommended concentration, On the other hand, all herbicides were harmful in the double dosage level

• Asian-Australasian Journal of Animal Sciences
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• v.18 no.8
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• pp.1182-1187
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• 2005

A flock of Arbor Acres chickens were reared in cages and provided with high energy pelleted feed. At 14 d of age, a total of 350 birds were separated into 3 groups randomly as follows: 100 birds were exposed to ambient temperature of 20$^{\circ}C$ as a control group, 150 birds were exposed to lower ambient temperature of 11$^{\circ}C$ to induce ascites (group I), and another group of 100 birds were exposed to lower ambient temperature of 11$^{\circ}C$ and fed diet containing 1% L-arginine for ascitic prophylactic treatment (group II). Blood and tissue samples (lung and liver) were collected from chickens at 3, 4, 5, 6 and 7 wk of age subsequently, to analyze the concentration and activities of free radicals, mononaldehyde (MDA), superoxide dismutase (SOD), Nitric Oxide (NO) and Nitric oxide synthase (NOS). The results showed that the prevalence of ascites in the control, group I and group II was 3%, 9.33% and 3% respectively (p<0.01). The concentration of free radicals in the lungs of 3 wks old preascitic broilers in group I was significantly higher than in the corresponding control group (p<0.05). The concentrations of free radicals in lung and liver in the 7 wk period, and that of NO and SOD in the plasma were significantly lower in group I than in the control group (p<0.01). However, the accumulated MDA contents in group I were higher than in the control group and group II (p<0.05), respectively. In the same way, the activity of NOS in group II was higher than both group I and control group (p<0.01) during the 7 wk period. There was no significant difference between SOD activities of group II and the control group (p>0.05), and also insignificant difference between NOS in group I and the control group (p>0.05). The results of this study indicate that there was a significant decrease in the concentration of MDA in group II. On the other hand, the concentration of free radicals decreased and MDA concentration increased in group I during the 7 wk period. The reduction in concentration of MDA in group II, following arginine supplementation may be associated with the scavenging activity of NO.

• IEIE Transactions on Smart Processing and Computing
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• v.4 no.6
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• pp.391-402
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• 2015

In this paper, we present implementation of backward movement control of truck-trailer vehicles using a fuzzy mode-based control scheme considering practical constraints and computational overhead. We propose a fuzzy feedback controller where output is predicted with the delay of a unit sampling period. Analysis and design of the proposed controller is very easy, because it is synchronized with sampling time. Stability analysis is also possible when quantization exists in the implementation of fuzzy control architectures, and we show that if the trivial solution of the fuzzy control system without quantization is asymptotically stable, then the solutions of the fuzzy control system with quantization are uniformly ultimately bounded. Experimental results using a toy truck show that the proposed control system outperforms a conventional system.

• Proceedings of the KIEE Conference
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• 2003.07d
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• pp.2328-2330
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• 2003

This paper presents a new design methodology of networked control system using CAN(Controller Area Network). Feedback control systems having control loops closed through a network are called networked control systems. We design CAN nodes which can transmit control and monitoring data through network bus and apply these to networked control system design. We analyze the variation of stability property according to network-induced delay and determine a proper sampling period of networked control system that preserves stability performance. The results of the experimental example validate effectiveness of our networked control system.

• Horticultural Science & Technology
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• v.34 no.5
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• pp.746-754
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• 2016

This study was conducted to assess the effect of ethylene producing tablet (patent no.10-1574011) and treatment period on quality and storability of banana (AAA - Cavendish group) fruit imported into Korea from the Philippines. Three and five days of treatment periods, and different concentrations of ethylene tablet (50 ppmv, 100 ppmv) and control (standard ethylene gas treatment at a concentration of 100 ppmv) were used for the study. Slightly higher respiration rate was observed in banana fruits treated with 50 ppmv in both 3 and 5 days after treatments as compared to the control. Better storability was observed with banana fruits treated with 50 ppmv and 100 ppmv as compared to the control. All the treatments were shown a decrease in firmness as the storage days proceeded. The highest firmness was recorded from 50 ppmv on the initial day of storage while the lowest was recorded from 100 ppmv on 9 day storage. It was observed that banana fruits could be stored for up to 12 days without losing their color quality in all treatments except for the control. However, the quality of fruits at the control rapidly decreased (lost marketability) after 9 days of storage. Banana fruits treated with ethylene tablet with 100 ppmv for 5 days recorded the highest soluble solids content (SSC) at the beginning of storage period which was similar with the control. However, banana fruits treated with ethylene tablet with 100 ppmv for 3 days showed better storability than the control. On the other hand, ethylene tablet with 50 ppmv for 5 days of treatment has extended banana shelf life without affecting peel color, firmness and SSC content. Hence, these results indicate that banana fruits treated with ethylene tablet with 100 ppmv for 3 days or /and 50 ppmv for 5 days are an optimum for ripening of banana to be used for market and ultimate consumption.

• Proceedings of the Korea Society of Poultry Science Conference
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• 2004.11a
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• pp.95-96
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• 2004

An experiment was conducted to investigate the effects of dietary supplementation of feather meal (FM its) digests on the performance of broiler chicks and taurine content in broiler meat. A total of 1,000 broiler chickens were assigned to five dietary treatments : Control, FM diet(FM), FM+pyridoxine(FM+Pyridox), H$_2$O$_2$ treated FM diet(H$_2$O$_2$-FM) and enzyme treated FM diet (Enzyme-FM). Treated diets were supplemented with FM or FM digests at the level of 5 % to the control diet. During the stater period, weight gain of chicks fed FM+Pyridox was significantly higher(P<0.05) than those of the other FM or FM digest treatments but was not different from the control. Weight gam of overall period were not significantly different among treatments. Feed intake of the control was greater than that of FM or FM digest treatments. Feed conversion ratio(feed intake/gain) of chicks fed FM and H$_2$O$_2$-FM were significantly higher than those of Enzyme-FM and FM+Pyridox, but were not significantly different from the control. Taurine contents of leg and breast mucle were significantly (P<0.01) different among treatments but those of liver were not significantly different. Taurine content of FM+Pyridox was highest in both leg and breast muscle. It was 85 % higher in leg muscle and 15 % higher in breast muscle than that of the control. Sensory evaluation data showed significant but not consistant responses in various parameters. FM + Pyridox treatment showed highest score in aroma of raw leg muscle of male and in juiciness and tenderness of broiled breast muscle of male chickens. Control group showed highest color score in raw leg muscle of female and lowest overall acceptability score in broiled breast and leg muscle of male chicken. It is concluded that taurine can be enriched especially in broiler leg meat by 5 % FM diet supplemented with pyridoxine.

• The Korean Journal of Food And Nutrition
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• v.30 no.1
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• pp.175-180
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• 2017

To enhance the physiological activities and reduce the off-flavor of garlic in the Kimchi, we manufactured the Kimchi seasoning replaced with 25~75% black garlic instead of raw garlic and measured the contents of antioxidants and antioxidant activities. The polyphenol compound content was $270.91{\mu}g/mL$ in the control and $278.18{\sim}305.75{\mu}g/mL$ in the Kimchi seasoning with black garlic. The polyphenol compound content increased by increasing the amount of black garlic in the Kimchi seasoning. The polyphenol compound contents gradually decreased during storage period. The flavonoid compound content was 26.18 mg% in the control and 26.80~38.72 mg% in the Kimchi seasoning replaced with 25~75% black garlic. The flavonoid compound contents increased by increasing the amount of black garlic. The flavonoid contents were different from those of polyphenol compounds during storage periods. In the case of DPPH electron donating abilities, DPPH electron donating ability of the control was 84.82%, which showed a lower antioxidative activity than the Kimchi seasoning replaced with black garlic. The electron donating abilities of the Kimchi seasoning replaced with black garlic were increased as the amount of black garlic was increased. In the lipid peroxidation test, the control showed no lipid peroxidation during the storage period. The Kimchi seasoning replaced with black garlic also inhibited lipid peroxidation during storage as in the control. However, it showed lower activity than the control. Reducing power was higher in the Kimchi seasoning replaced with black garlic than in the control. The higher the ratio of black garlic, the higher the reducing power.

• Journal of Electrical Engineering and Technology
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• v.10 no.3
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• pp.1363-1369
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• 2015

The frequency of a power system should be maintained within the allowed limits for stable operation. When a disturbance such as generator tripping occurs in a power system, the frequency is recovered to the nominal value through the inertial, primary, and secondary responses of the operating synchronous generators (SGs). However, for a power system with high wind penetration, the system inertia will decrease significantly because wind generators (WGs) are operating decoupled from the power system. This paper proposes a dynamic droop-based inertial control for a WG. The proposed inertial control determines the dynamic droop depending on the rate of change of frequency (ROCOF). At the initial period of a disturbance, where the ROCOF is large, the droop is set to be small to release a large amount of the kinetic energy (KE) and thus the frequency nadir can be increased significantly. However, as times goes on, the ROCOF will decrease and thus the droop is set to be large to prevent over-deceleration of the rotor speed of a WG. The performance of the proposed inertial control was investigated in a model system, which includes a 200 MW wind power plant (WPP) and five SGs using an EMTP-RV simulator. The test results indicate that the proposed scheme improves the frequency nadir significantly by releasing a large amount of the KE during the initial period of a disturbance.

• The Korean Journal of Physiology
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• v.3 no.1
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• pp.59-66
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• 1969

Experiments on thermoregulatory responses to cold immersion stimulus were carried out in September, 1968 (summer studies) and February, 1969 (winter studies). Eight each of ama and control subject were selected at random from a same community in Yong-Do Island, Pusan. The results obtained are summarized as follows: 1) The rate of fall in muscle temperature of forearm during a 30 min-immersion in $6^{\circ}C$ water bath was significantly slower in the ama in winter and was about the same in the two groups in summer. However, the magnitude of change in the skin temperature and the heat fluxes observed during immersion period was not significantly different either between groups or between seasons. 2) Both finger blood flow and skin temperature during one hr-immersion in $6^{\circ}C$ water bath decreased significantly in the ama as compared to the control. The magnitude of cold-induced vasodilatation during immersion period was significantly greater in the control in winter. However, the time of onset and blood flow at onset showed no significant relation between groups. 3) The magnitude of reactive hyperemia after a 5 min-arterial occlusion in both air and $15^{\circ}C$ water bath was significantly lower in the ana than in the control. In control subjects, post-occluded blood flow in water was significantly greater than in air, while in the ama it decreased to 1/2 of control values. The time required for the return of blood flow to resting values in the air was faster in the ama than in the control but was the same in water in the two groups. 4) The results suggest that vasoconstrictor tone increased in the ama in winter, indicating the development of vascular adaptation as a part of cold acclimatization.

• Journal of the Korean Institute of Telematics and Electronics
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• v.12 no.4
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• pp.15-20
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• 1975

The power overshoot is rises in the output during the transient period when the output of nuclear reactor is increased from the initial state to the desired target state and certain amount of constraint on power level is of primary importance for safety control of nuclear reactor. Therefore, the maximum principle is applied to this process control in transfering its power from the initial state(no, co) to the final target state(2no, 2co or 1.5no, 1.5co), adjusting the reactivity so that its overshoot is limited within the allowable constraint required. In this case, the switching points, switching times, optimal lima and optimal control reactivity are calculated.