• Food Science and Preservation
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• v.18 no.6
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• pp.824-829
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• 2011

This study was conducted to identify quality indicators to determine freshness of muskmelon during distribution. The correlation between each quality characteristic and organoleptic preference was analyzed after examining weight loss, firmness, soluble solid content, chromaticity, and respiration rate of and changes in the organoleptic characteristics during storage at 0, 10, 20 and $30^{\circ}C$ after harvesting. The correlation between weight loss and preference according to the storage temperature was shown to be significant (p<0.01). The correlation between firmness and preference was shown to be highly significant (R=0.74, 0.78, 0.88, and 0.83 at 0, 10, 20, and $30^{\circ}C$) under all temperature conditions, and was shown to be especially highly significant (p<0.01) when the temperature was high. In the case of storage at 20 and $30^{\circ}C$, a significant correlation between soluble-solid content and preference was shown. Therefore, it is right to apply the change in weight loss and firmness that indicated a high correlation with organoleptic preference as a quality indicator at all storage temperatures.

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.18 no.1
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• pp.43-49
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• 2020

An engineered barrier system (EBS) for the geological disposal of high-level radioactive waste (HLW) consists of a disposal canister packed with spent fuel, buffer material, backfill material, and gap-filling material. The buffer material fills the space between the canister and the near-field rock, thus serving to restrain the release of radionuclides and protect the canister from groundwater penetration. Furthermore, as significant amounts of heat energy are released from the canister to the surrounding rock, the thermal conductivity of the buffer plays an important role in maintaining the safety of the entire disposal system. Therefore, given the high levels of heat released from disposal canisters, this study measured the thermal conductivities of compacted bentonite buffers from Gyeongju under temperature variations ranging 25 to 80~90℃. There was a 5~20% increase in thermal conductivity as the temperature increased, and the temperature effect increased as the degree of saturation increased.

• Journal of the Korean Chemical Society
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• v.32 no.1
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• pp.71-78
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• 1988

The crown ether ring of 20, 21, 24, 25-tetranitrodibenzo-18-crown-6(TNDB-18-C-6) was cleaved by various alcoholic bases to give 2,4,5-trialkoxynitrobenzene derivatives and 4,5-dialkoxy-1,2-dinitrobenzene derivatives as the major products, and bis[(alkoxynitrophenoxy)ethyl]ether derivatives from partially cleaved crown ether ring as the minor products. The ring cleavage reaction of TNDB-18-C-6 with ethylene glycolic base resulted ring contraction through intramolecular nucleophilic cyclization of the initially formed ring cleavage product to give nitro derivatives of DB-14-C-4.

• KSBB Journal
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• v.15 no.1
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• pp.72-75
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• 2000

The hydrolysis characteristics of each fatty acid composing the fish oil by means of the lipase from Candida cylindracea was investigated. The saturated fatty acids, C14:0, C16:0 and C18:0, and the unsaturated fatty acids with one double bond, C16:1, C18:1(n-7), C18:(n-9), C20:1 and C22:1 were more easily hydrolyzed than the $\omega$-3 polyunsaturated fatty acids. when the number of carbon of the $\omega$-3 fatty acids was same but that of double bond was different, the hydrolysis of the $\omega$-3 fatty acids having lower number of double bond was more rapidly carried out. When the degree of polyunsaturation was same but the number of carbon was different, the lipase acted more rapidly upon the $\omega$-3 fatty acids with lower number of carbon. Docosahexaenoic acid(DHA) was most highly concentrated in the glyceride mixture after 120hr hydrolysis among the various $\omega$-3 polyunsaturated fatty acids. The weight percentage of DHA to the $\omega$-3 fatty acids in the fish oil was 31.87% but that in the glyceride mixture after 120hr hydrolysis was 51.89%.

• Proceedings of the KSLP Conference
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• 1998.11a
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• pp.181-181
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• 1998

목적 : 성대결절이 있는 서양음악을 전공한 성악도들의 발성시 음향학적 특징과 문제점을 알아보고자 하였다. 대상 및 방법 : 음악대학교 성악과에서 소프라노를 전공하는 학생으로, 음성장애로 인하여 치료를 받은 과거력이 없으면서 성대화상술 검사상 성대결절이 확인된 18세부터 25세 사이의 여학생 10명을 대상군으로 하고, 성대결절이 없는 성악도 20명을 대조군으로 하여 평소 발성상의 문제점과 연주시의 문제점에 대한 설문조사와 음성분석을 시행하였다. (중략)

• Nuclear Medicine and Molecular Imaging
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• v.40 no.5
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• pp.249-256
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• 2006

Purpose: Although computed tomography (CT) is widely used for diagnosing liver metastasis from colorectal cancer, diagnostic accuracy of CT is not satisfactory. Magnetic resonance (MR) imaging and F-18 FDG PET has been reported to be superior to CT. However, studies on direct comparison of PET and MR are scarce. We compared the diagnostic accuracy of FDG PET and MR in detecting liver metastasis from colorectal cancer. Materials and Methods: Among 363 colorectal cancer patients who underwent F-18 FDG PET (ECAT, Siemens-CTI, Knoxville; Gemini, Philips, Milpitas, U.S.), 26 patients (M:F=17:9, age=$62{\pm}11$) underwent MR to evaluate suspicious metastatic liver lesions. Finally, 35 liver lesions detected by CT from 26 patients were enrolled for analysis. PET and MR results were compared with pathologic reports, clinical findings or follow-up results. Results: Of the 35 lesions, 18 lesions (51.4%) were diagnosed as liver metastases, while remaining 17 (48.6%) as benign. The sensitivity and the specificity of PET were 94.4% and 94.1%, respectively, compared to 100% and 82.4% for MR. MR and PET was concordant in 30 lesions (85.7%: 17 metastatic (94.4%) and 13 benign (76.5%) lesions. ROC curve analysis revealed maximal SUV of 3.1 as the optimum standard in differentiating metastatic from benign liver lesions (AUC=0.897, p<0.001, sensitivity 83.3%, specificity 94.1%). For small lesions less than 1 cm ln diameter (n=20), diagnostic accuracy of PET was comparable to that of MR. Conclusion: F-18 FDG PET showed good diagnostic performance in detecting liver metastasis from colorectal cancer, which was comparable to MR.

• The Journal of the Petrological Society of Korea
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• v.17 no.4
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• pp.206-221
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• 2008

We have studied general orientational characteristics of microcracks distributed in Bulgugsa Granites of southwestern Gyeongsang Basin. Microcracks of 131 sets, which were developed on horizontal surfaces of II rock samples collected from Sacheon-Gosung, Geoje-si and Namhae-gun areas, were distinguished by image processing. Then, 45 sets with a distinct linear array on image were sorted out. These microcracks can be comparable with vertical grain planes. Orientations of these microcracks were compared with those of vertical rift and grain planes developed in Cretaceous and Jurassic granites of Korea. In the distribution chart, the agreement of the distribution pattern between microcracks of 45 sets and above vertical planes suggests that microcrack systems developed all over the study area also occur regionally in Cretaceous and Jurassic granites of Korea. Whole domain of the directional angle-frequency chart can be divided into 20 domains in terms of the phases of the distribution of microcracks. Meanwhile, 18 domains from 45 sets of microcracks were compared with the maximum principal stress orientations suggested from previous studies. The majority of maximum principal stress orientations pertain to domain $1{\sim}2$, $5{\sim}6$, $11{\sim}15$, $17{\sim}18$ and $19{\sim}20$, and these domains are coincident with the orientation of the 1st and 2nd-frequency orders represented in a rose diagram for 45 sets of microcracks. Representative orientations of open microcrack reflect the maximum principal stress orientations suggested in previous studies.

• Journal of Industrial Convergence
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• v.21 no.1
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• pp.137-145
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• 2023

The purpose of this study was to find the effects of ethical awareness about pandemic and health beliefs of standard precaution on performance standard precaution of nursing students. The survey was performed on 163 nursing students in three universities. Data were collected using a structured questionnaires and analyzed using t-test, ANOVA, Pearson correlation coefficient, and multiple regression with SPSS 25.0 program. Study findings revealed that performance standard precautions was significantly correlated with ethical awareness about pandemic(r=.17, p=.033), perceived susceptibility(r=.33, p<.001), perceived severity (r=.24, p=.003), perceived benefits(r=.35, p<.001) and perceived obstruction(r=-.31, p<.001). The factors that had the influences on performance standard precaution were the perceived benefits(β=.20, p=.014)) and perceived obstruction(β=-.20, p=.008). And the explanation power of the regression model appeared as being 18.1%(F=8.09, p<.001). It is necessary to develop a systematic infection education program that considers ethical awareness, and perceived severity and obstruction among health beliefs of standard precaution to improve performance standard precaution of nursing students.

• RED RIBBON
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• s.75
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• pp.18-20
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• 2007

유럽에서는 에이즈 예방 광고를 쉽게 접할 수 있다. 이들 광고의 소재나 내용을 들여다보면 콘돔의 사용을 강조하는 것이 거의 대부분이다. 에이즈를 예방하는 가장 확실한 방법이 콘돔이기 때문에 당연한 일이기는 하지만, 그 광고 표현 기술이 아주 세련되고 아이디어가 독특하여 눈여겨 볼만하다. 광고자체로서도 완성도가 높은 유럽 에이즈광고 두 편을 소개한다.

• Digital Contents
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• no.6 s.145
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• pp.100-103
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• 2005

지난달 18일부터 미국 LA컨벤션센터에서 개최된‘E3 2005’가 성황리에 모든 일정을 마쳤다. 전세계에서 200여 게임업체를 비롯해 엔터테인먼트 기기와 장비 등의 분야에서 모두 450여개 기업이 참가한 이번 행사는 매년 20% 이상씩 성장하고 있는 세계 엔터테인먼트 시장의 흐름을 한눈에 펼쳐 보였다.