• ETRI Journal
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• 제44권3호
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• pp.512-523
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• 2022

Random delay countermeasures introduce random delays into the execution flow to break the synchronization and increase the complexity of the side channel attack. A novel method for attacking devices with random delay countermeasures has been proposed by using a maximal overlap discrete wavelet transform (MODWT)-based power trace alignment algorithm. Firstly, the random delay in the power traces is sensitized using MODWT to the captured power traces. Secondly, it is detected using the proposed random delay detection algorithm. Thirdly, random delays are removed by circular shifting in the wavelet domain, and finally, the power analysis attack is successfully mounted in the wavelet domain. Experimental validation of the proposed method with the National Institute of Standards and Technology certified Advanced Encryption Standard-128 cryptographic algorithm and the SAKURA-G platform showed a 7.5× reduction in measurements to disclosure and a 3.14× improvement in maximum correlation value when compared with similar works in the literature.

• Journal of the Korean Society of Food Science and Nutrition
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• 제43권11호
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• pp.1709-1715
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• 2014

The objective of this study was to examine the antioxidant activities of extracts from Mori ramulus using different extraction methods (HE, hot water extraction; EE, 50% ethanol extraction; UE, ultrasonic extraction; PE, pressured extraction). The extraction yield of PE (3.07%) was higher than that of UE (1.43%), EE (1.18%), and HE (1.07%). The total phenolic and flavonoid contents of EE were 334.66 mg/g, and 35.64 mg/g, respectively. The oxygen radical absorbance capacity (ORAC) of EE ($3,483.37{\mu}M/g$ FW) was higher than those of HE ($2,687.52{\mu}M/g$ FW), UE ($2,300.45{\mu}M/g$ FW), and PE ($2,117.62{\mu}M/g$ FW). The DPPH and ABTS radical scavenging activities of EE at $1,000{\mu}g/mL$ were 65.84%, and 97.52%, respectively. The superoxide radical scavenging activity of EE was 67.77~98.74% ($100{\sim}500{\mu}g/mL$) higher than those of other extracts. The ferric reducing antioxidant power and reducing power of EE were $189.00{\sim}974.80{\mu}M$, and 0.12~0.82, respectively. The tyrosinase inhibitory activity of EE (23.25~67.20%) improved with an increase treatment concentration. The antioxidant and tyrosinase inhibitory activities of EE were significantly higher than those of other extracts. In conclusion, we provided experimental evidence that extracts from Mori ramulus have potential as functional materials.

• Food Science and Preservation
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• 제21권4호
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• pp.565-572
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• 2014

This study was conducted to examine the antioxidant activities of extracts derived with different extraction methods (HE, hot water extraction; UE, ultrasonic extraction; and PE, pressured extraction) from Phellinuslinteus mycelium in Mori ramulus. The extraction yield of PE (7.73%) was higher than that of UE (6.03%) and of HE (5.44%). The total phenolic and flavonoid contents of PE were 9.87 g/100 g and 1.90 g/100 g, respectively. The oxygen radical absorbance capacity (ORAC) of PE ($769.63{\mu}M/g$ FW) was higher than that of HE ($622.96{\mu}M/g$ FW) and of UE ($249.06{\mu}M/g$ FW). The DPPH and ABTS radical scavenging activities of PE at $1,000{\mu}g/mL$ were 35.85% and 51.42%, respectively. The superoxide radical scavenging activity of PE, 29.16-93.89%, was higher than that of other extracts. The ferric-reducing antioxidant power and the reducing power of PE were $180.60-607.93{\mu}M$ and 0.14-0.51, respectively. The tyrosinase inhibition activity of PE (9.66-24.05%) improved with an increase in the treatment concentration. The antioxidant and tyrosinase inhibition activities of PE were significantly higher than those of the other extracts. In conclusion, we provided experimental evidence that Phellinus linteus mycelium extracts from Mori ramulus have potential as functional materials.

• Journal of the Korea Academia-Industrial cooperation Society
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• 제20권2호
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• pp.527-534
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• 2019

Japanese sumac (Rhus javanica) is one of the common herbaceous plants growing over the country. This study was conducted to investigate the extraction characteristics and physiological activities inluding nitrite scavenging ability of the water extracts from leaf, fruit and bark of Japanease sumac. Extraction yield was 6.62~13.84%, free amino acids were detected as 24 kinds with 37.9 mg/100g in leaf extract, 23 kinds with 27.0 mg/100g in fruit extract and 27 kinds with 39.0 mg/100g in bark extract, respectively, and seven kinds essential amino acids were detected. Total contents of flavonoids equivalent to naringin were 587.2 mg/100g in bark extract, 557.3 mg/100g in fruit extract and 379.9 mg/100g in leaf extract, respectively. Total contents of phenolics equivalent to gallic acid were 111.2 mg/100g in leaf extract, 108.4 mg/100g in fruit extract and 80.4 mg/100g in bark extract, respectively. The nitrite scavenging ability of extracts was order of 61.93% in bark extract>57.38% in fruit extract>55.49% in leaf extract, and was 78.1~100% of those of BHT (butylated hydroxytoluene) equivalents at pH 1.2. The electron donating ability was order of 47.38% in fruit extract>43.06% in leaf extract>38.55% in bark extract, and was compared to 65.6%, 58.8% and 53.6% of those of BHT equivalents, respectively. The reduction power was evaluated to 37% higher in leaf extract, 43% higher in fruit extract and 46% higher in bark extract than those of BHT equivalents. The metal chelating ability of extracts was considerably low and was order of 27.3% in bark extract>20.6% in leaf extract>11.2% in fruit extract.

• Analytical Science and Technology
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• 제19권1호
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• pp.1-8
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• 2006

The isotope dilution method was used for the determination of Br impurity in $1000{\mu}g/g$ Cl standard solution. Since relatively pure KCl salt was used for the preparation of the Cl standard solution, the Br impurity determination suffers from both spectral and non-spectral interferences due to the presence of a large amount of K and Cl matrices. AG2-X8 anion-exchange resin was employed to separate the Br analyte from the matrices, and RF power was raised to 1500 W and nebulizer gas flow rate was lowered to 0.77 L/min to reduce background from the $ArArH^+$ molecular ions. The Br impurity in the $1000{\mu}g/g$ Cl standard solution was determined to be 43.7 ng/g with the standard addition method. The analytical result was in good agreement with 41.2 ng/g (RSD 1.6%) determined by the isotope dilution method to lower uncertainty from poor reproducibility of the anion-exchange process.

• Journal of Power System Engineering
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• 제9권1호
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• pp.5-13
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• 2005

Acoustic emission(AE) is defined as the transient elastic waves thar are generated by the rapid release of energy. The advantage of AE is that very early crack growth can be detected well before a highly stressed component may fail. At present, an exact diagnosis is the most reliable means for determining the soundness of structures during power plant operations. AE monitoring has been applied successfully in power plants to determine mechanical problems, pressure vessel integrity and external valves leaks, vacuum leaks, the onset of cavitation in pumps and valves, the presence of flow(or no flow) in piping and heat exchange equipment, etc. Acoustic emission(AE) technology has recently strengthened its application base, and practitioners' understanding of the technique's fundamentals. This paper introduces the methods of a survey and assessment on AE monitoring applications in nuclear, fossil and hydraulic power plant. The main objective of this paper was to obtain information on various applications of AE technology in power plant.

• Proceedings of the KIEE Conference
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• 대한전기학회 1998년도 하계학술대회 논문집 C
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• pp.1125-1127
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• 1998

Inchon International Airport(IIA) is constructed for Northeast Asia Gate as is important for IIA to become a 21 century's leader in the world. as is planned for open at December 2000 as a important economic link for unified korea. Power System is designed through investigation of advanced domestic and international example. In addition to power facility operation it is designed for using an information infrastructure of whole airport. IIA Power System Design make instantaneously the Power Distribution Facilities and the SCADA System to construct the airport. and the Airport Power Information System to operate the Power System. It is designed to take efficient and safe Power System including the advanced technology. Power System make the integrated Power Information Database to operate the Main Control Center, analyze the data about the relation of the Power System and Airport operation, and will support the important files in the future.

• International Journal of Automotive Technology
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• 제8권5호
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• pp.651-658
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• 2007

This paper presents a new type of fuzzy logic-based power control strategy for fuel cell hybrid electric vehicles designed to improve their fuel economy while maintaining the battery's state of charge. Since fuel cell systems have inherent limitations, such as a slow response time and low fuel efficiency, especially in the low power region, a battery system is typically used to assist them. To maximize the advantages of this hybrid type of configuration, a power distribution control strategy is required for the two power sources: the fuel cell system and the battery system. The required fuel cell power is procured using fuzzy rules based on the vehicle driving status and the battery status. In order to show the validity and effectiveness of the proposed power control strategy, simulations are performed using a mid-size vehicle for three types of standard drive cycle. First, the fuzzy logic-based power control strategy is shown to improves the fuel economy compared with the static power control strategy. Second, the robustness of the proposed power control strategy is verified against several variations in system parameters.

• Journal of the Earthquake Engineering Society of Korea
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• 제19권2호
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• pp.63-74
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• 2015

This study investigated the influence of probabilistic variability in stiffness and nonlinearity of soil on response of nuclear power plant (NPP) structure subjected to seismic loads considering the soil-structure interaction (SSI). Both deterministic and probabilistic methods have been employed to evaluate the dynamic responses of the structure. For the deterministic method, $SRP_{min}$ method given in USNRC SRP 3.7.2(2013) (envelope of responses using three shear modulus profiles of lower bound($G_{LB}$), best estimate($G_{BE}$) and upper bound($G_{UB}$)) and $SRP_{max}$ method (envelope of responses by more than three ground profiles within range of $G_{LB}{\leq}G{\leq}G_{UB}$) have been considered. The probabilistic method uses the Latin Hypercube Sampling (LHS) that can capture probabilistic feature of soil stiffness defined by the median and the standard deviation. These analysis results indicated that 1) number of samples shall be larger than 60 to apply the probabilistic approach in SSI analysis and 2) in-structure response spectra using equivalent linear soil profiles considering the nonlinear behavior of soil medium can be larger than those based on low-strain soil profiles.

• Korean Journal of Acupuncture
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• 제25권2호
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• pp.199-210
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• 2008

Objectives : This study was performed to investigate the effect of invasive laser acupuncture therapy with green light (LAT-G) at HT7(Sinmun), SP3(Taebaek) on the blood pressure in hypertensive rat induced by two kidney one clip. Methods : The experiments were performed on Sprague Dawley rats. 2K1C hypertension model was prepared by constricting the left renal artery with a sliver clip. Animals were divided into four groups, which were simple acupuncture treatment group with straight needle insertion on the square(AT-SS), acupuncture treatment group with reducing manipulation in the opposite channel direction(AT-RD), laser acupuncture treatment group with green light 532 nm, 10mW power in the opposite channel direction(LAT-G10) and laser acupuncture treatment group with green light 532 nm, 20mW power in the opposite channel direction(LAT-G20). The treatments were performed once per two days for 10 days. Results : Body weight was increased significantly in LAT-G20 group compared with AT-RD group. The blood pressure was significantly decreased in LAT-G20 and LAT-G10 groups compared with AT-SS group. Conclusions : These results suggest that green laser acupuncture therapy at SP3 ${\cdot}$ HT7 is more effective than straight needle insertion on the square for controlling hypertension. It is possible that invasive green laser acupuncture therapy (532 nm) can be used as a reducing method of the traditional acupuncture techniques.