• The Korean Journal of Mycology
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• v.39 no.2
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• pp.111-116
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• 2011

This study was carried out to examine Electron donating ability (EDA), nitrite scavenging, tyrosinase inhibition, ACE inhibition activity and fibrinolytic activity of culture extracts from Phellinus linteus which was grown added rice bran, pine needles and turmeric in brown rice. Electron donating ability of Phellinus linteus extract (PLE) was lower in the water extract than the ethanol extract. Nitrite scavenging activity was the highest in PLE from ethanol extract than water extract. Especially, when the pine needles was addition treatment, the nitrite scavenging activity was about 70% at pH 1.2 by ethanol extract. Tyrosinase inhibition activity of PLE was highest in the water extract than ethanol extract, and inhibition rate was the most higher in the extract by hot water added pine needles. ACE inhibition activity were very low effective at water and ethanol extract. Fibrinolytic activities were similarly strong in rice bran, pine needles and turmeric powder. Especially, when rice bran was added, showed the activity was increased about 5% than plasmin. Therefore, It may be used for the food industry as natural source of bioactive compound after further investigation, such as in vivo experiment.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.29 no.3
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• pp.271-278
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• 1996

Daytime surface zooplankton were collected bimonthly from April 1993 to March 1994 at six stations around upwelling and adjacent areas of Cosan, western part of Cheju Island. This paper deals with the occurrence, biomass and some other characteristics of zooplankton in these areas. Copepods had two peaks in the abundance in June $(235\;ind./m^3)$ and November $(301\;ind./m^3)$, but were not especially abundant in upwelling area. While gelatinous organisms seldom occurred in the upwelling, and the outer area with high density of $75\;ind./m^3$ (in June) and $458\;ind./m^3$ (in November) at the intermediate area, seasonal values of biomass with mean of $35.8\;mg/m^3$ were the highest in November and the lowest in January. Abundance of chaetognaths (mainly Sagitta spp.) ranged $15\~37\;inds./m^3$ and carcasses of Sagitta occurred very highly in the upwelling area in June ($54\%$ of total Sagitta organisms) and November $(70.5\%)$. Especially $48\~77\%$ of Sagitta individuals in upwelling area in November was attached by Oncaea mediterranea, O. venusta and Candacia bipinata. Pteropods with shells were sampled only in the upwelling area during strong upwelling season (November, $27\~64\;ind./m^3$), indicating the characteristics of ascending behavioral adaptation from the bottom water by upwelling.

• Journal of the Korean Society of Food Science and Nutrition
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• v.32 no.1
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• pp.143-148
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• 2003

Antitumorigenic and antimutagenic activities of the doenjangs prepared from mushroom mycelia-cultured traditional mejus (designated to MTDJ) were investigated using the model of Sarcoma-180-induced mouse ascites cancer, and 2-amino-3-methylimidazo ［4,5-f］ quinoline (IQ) and aflatoxin B$_1$ (AFB$_1$) -mediated S. typhimurium mutagenicity, respectively. Antioxidative activity of MTDJ was also investigated using the mouse liver microsome system. Mushroom stains used for the preparation of the mushroom mycelia-cultured traditional mejus were Synryeong (Agaricus blazei), Yeonggi (Canoderma Iucidum), Sanghwang (Phellinus linteus), and Neutari (Pleurotus ostreatus). All MTDJS showed the enhanced antitumorigenicities (12% by Synryeong, 13% by Sanghwang, 16% by Yeonggi, and 19% by Neutari), antimutagenicity (6.1~20.8% for IQ and 3.1~10.2% for AFB$_1$), and antioxidative activity (6.6~46.5%), relative to the control doenjang. The $\beta$-D-glucan content (0.75~1.71 mg/g) of MTDJs was 3~8 times higher than that (0.22 mg/g) of the control doenjang. Genistein content (769~932 Ug/g) of MTDJS was also higher than that (728 Ug/g) of control doenjang The content of $\beta$-D-glucan and genistein was not exactly correlated to the antitumorigenicity and antimutagenicity of MTDJs. These results indicate that anti-tumorigenicity and antimutagenicity of MTDJS were elevated in comparison with the control doenjang, and the observed functions were, in part, derived from $\beta$-glucan and/or genistein in the MTDJS.

• Journal of Radiation Protection and Research
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• v.27 no.3
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• pp.155-164
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• 2002

Methodology to evaluate the effective doses to adults undergoing various diagnostic x-ray examinations were established by Monte Carlo simulation of the x-ray examinations. Anthropomorphic mathematical phantoms, the MIRD5 male phantom and the ORNL female phantom, were used as the target body and x-ray spectra were produced by the x-ray spectrum generation code SPEC78. The computational procedure was validated by comparing the resulting doses to the results of NRPB studies for the same diagnostic procedures. The effective doses as well as the organ doses due to chest, abdomen, head and spine examinations were calculated for x-rays incident from AP, PA, LLAT and RLAT directions. For instance, the effective doses from the most common procedures, chest PA and abdomen AP, were 0.029 mSv and 0.44 mSv, respectively. The fact that the effective dose from PA chest x-ray is far lower than the traditional value of 0.3 mSv(or 30 mrem), which results partly from the advances of technology in diagnostic radiology and partly from the differences in the dose concept employed, emphasizes necessities of intensive assessment of the patient doses in wide ranges of medical exposures. The methodology and tools established in this study can easily be applied to dose assessments for other radiology procedures; dose from CT examinations, dose to the fetus due to examinations of pregnant women, dose from pediatric radiology.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.43 no.4 s.310
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• pp.9-18
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• 2006

In the digital camera system, CMOS image sensor (CIS) is widely used because its size and weight become smaller and power consumption becomes lower. However, there are common problems that colors of the recorded image do not match those of the photographed object and that spectral sensitivity of the CIS used in different cameras varies largely in each case. Therefore, color correction is needed because the spectral sensitivity of the CIS in each color is neither the same color component for most standard colors nor the appropriate color representation for any output devices. In the conventional method, a color correction is empirically obtained by a large number of iterative experiments, but the result is not so satisfied. In this paper, a new method to obtain the efficient color correction matrix for digital camera using CIS is proposed. We obtain camera transfer matrix under the certain white-balance point, and color correction matrix that makes the transfer characteristic of digital camera close to the transfer characteristic of ideal camera is obtained. The experimental results show that the transfer characteristic of digital camera by the proposed method is close to that of the ideal camera. In addition, the image quality of pictures of digital camera using the proposed method is dramatically improved.

• Korean journal of applied entomology
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• v.47 no.2
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• pp.185-188
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• 2008

A possible rapid biodegradation of abandoned livestock was tested by using the dead pig and chicken. The dead pig (36kg) was completely decomposed after 23 days of placement in the open field during June 2007. When the door of a cage in which a dead chicken (3.4kg) was placed was opened, a lot of flies were attracted to the chicken and layed eggs on the chicken. As the result the chicken was decomposed down to 0.6kg after 6 days of placement in the open field, On the other hand when the door was closed, the decomposition was very slow. The chicken weighed 3.0kg even after 6 days. An experiment conducted during October 2007 showed that decomposition speed depended on the number of inoculated flies. When 50 pairs of Lucilia sericata flies were inoculated to 3.2kg chicken, it was decomposed down to 1.0kg after 22 days in the field. However, when 200 female and 100 male flies were inoculated, the 3.4kg chicken was decomposed to 0.8kg after 11 days in the field. A 10,858 pupae (371.2g) was produced from the latter chicken. These pupae may possibly be used as a feed for fish and fowl. From these results it is considered that further research is needed to commercialize the blow flies for the rapid decomposition of an abandoned livestock of diverse size under diverse environment.

• Progress in Medical Physics
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• v.24 no.4
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• pp.303-314
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• 2013

Image quality of computed tomography (CT) is very vulnerable to metal artifacts. Recently, the thickness and background normalization techniques have been introduced. Since they provide flat sinograms, it is easy to determine metal traces and a simple linear interpolation would be enough to describe the missing data in sinograms. In this study, we have developed a theory describing two normalization methods and compared two methods with respect to various sizes and numbers of metal inserts by using simple numerical simulations. The developed theory showed that the background normalization provide flatter sinograms than the thickness normalization, which was validated with the simulation results. Numerical simulation results with respect to various sizes and numbers of metal inserts showed that the background normalization was better than the thickness normalization for metal artifact corrections. Although the residual artifacts still existed, we have showed that the background normalization without the segmentation procedure was better than the thickness normalization for metal artifact corrections. Since the background normalization without the segmentation procedure is simple and it does not require any users' intervention, it can be readily installed in conventional CT systems.

• Food Science and Preservation
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• v.10 no.4
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• pp.435-440
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• 2003

Such fruits as nut persimmons, mandarin oranges and apples stored in the far-infrared radiated chamber at 5$^{\circ}C$ under 90% of relative humidity had been maintained in the fresh state for longer times than the control stored only in the cold chamber. Fruits stored in the far-infrared radiated chamber showed lower values in weight loss rate, microbial colony count and decay ratio and higher ascorbic acid content than the control stored only in the told room through the storage period. We confirmed that fruits stored in the far-infrared radiated chamber under low temperature and high humidity showed least changes in quality properties through the storage period and the far-infrared radiated facilities could be a good storage system.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.42 no.4 s.304
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• pp.31-38
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• 2005

In this paper, we propose the chromatic adaptation models (CAM) for the variations of the luminance levels. A chromatic adaptation model, CAM$\Delta$Y , is proposed according to the change of luminance level under the same illuminants. The proposed model is obtained by the transform the test colors of the high luminance into the corresponding colors of the low luminance. In the proposed model, the optimal coefficients are obtained from the corresponding colors data of the Breneman's experiments. In the experimental results, we confined that the chromaticity errors, $\Delta$u'v', between the predicted colors by the proposed model and the corresponding colors of the Breneman's experiments are 0.004 in u'v' chromaticity coordinates. The prediction performance of the proposed model is excellent because this error is the threshold value that two adjacent color patches can be distinguished. Additionally, we also propose equal-whiteness CCT curves (EWCs) by CAM$\Delta$Y according to the luminance levels of the surround viewing conditions. And the proposed EWCs can be used as the theoretical standard which determines the reference white of the color display devices.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.42 no.6
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• pp.133-140
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• 2005

This paper presents a rapid face shape acquisition system. The system is composed of two cameras and one projector. The technique works by projecting a pattern on the object and capturing two images with two cameras. We use a 'one shot' system which provides 3D data acquired by single image per camera. The system is good for rapid data acquisition as our purpose. We use the 'absolutely coded pattern' using the hue and saturation of pattern lines. In this 'absolutely coded pattern' all patterns have absolute identification numbers. We solve the correspondence problem between the two images by using epipolar geometry and absolute identification numbers. In comparison to the 'relatively coded pattern' which uses relative identification numbers, the 'absolutely coded pattern' helps obtain rapid 3D data by one to one point matching on an epipolar line. Because we use two cameras, we obtain two images which have similar hue and saturation. This enables us to have the same absolute identification numbers in both images, and we can use the absolutely coded pattern for solving the correspondence problem. The proposed technique is applied to face data and the total time for shape acquisition is estimated.