• 생태와환경
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• 제51권4호
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• pp.354-364
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• 2018

본 연구는 2008년부터 2016년까지 한강 지류 중랑천을 대상으로 수환경 변화에 따른 어류 군집 양상을 파악하고자 실시하였다. 조사결과, 중랑천에서 서식하는 어류는 총 9과 37종 8,421개체로 나타났으며 과별 출현 종수는 잉어과에서 23종(62.2%)으로 가장 많은 종이 출현하였고, 생태계교란종 및 외래종은 모두 강우기 후 출현하는 특성을 보였다. 수질변화에 따르면, BOD, EC, TN, TP의 변화는 강우량의 증가에 따라 감소하는 양상을 보이는 반면, SS 변화는 증가하는 양상을 보였다. 지점간 CA결과 한강 본류와 인접한 St. 7과 St. 1, 3, 5가 어류의 출현양상 차이를 보였으며, PCA 분석결과 상류에서 하류, 강우기 전과 후의 어류출현양상과 유기오염지표의 변화 양상을 보였다.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2017년도 9th Asian Crop Science Association conference
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• pp.69-69
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• 2017

Due to the lack in storage facility, considerable amount of rice is stocked in the open air, which causes increased stale flavor and deteriorates palatability and merchantable quality. Lipoxygenase-3(LOX-3) is involved in the production of volatile constituents in stored rice, and the development of stale flavor is delayed in LOX-3 null rice. LOX activity in the rice grain is localized in bran fraction and the tropical Japonica cultivar 'Dawdam' was reported that the absence of LOX-3 is inherited as a simple recessive trait. Also, it was reported that the peroxidation of unsaturated fatty acids occurs at lower levels in the 'Dawdam' bran fraction during storage than in rice varieties with LOX-3. This study was conducted to develop LOX-3 null rice lines using 'Dawdam' and investigate changes of physicochemical properties of the lines stored at different storage temperatures and periods. So we analyzed texture, toyo glossiness value, germination rate and lipoxygenase activity of 15 LOX-3 null rice lines on the condition of which rough rice had been stored at different temperatures (high temperature condition at $35^{\circ}C$ and low temperature condition at $15^{\circ}C$ for 4months. Hardness and stickiness of the lines tendered to be increased when it was stored at high temperature and adhesiveness, springiness, cohesiveness and chewiness was not considerably different according to storage temperatures and periods. The germination rate of HR29062-B-98-2-1-B among LOX-3 null rice lines was higher than another lines, 99.3, 94.0% after 4months stored at low temperature and high temperature, respectively. The lipoxygenase activity was 3,304, 1,601unit/mg protein after 4months stored at low temperature and high temperatures, respectively. So, it is thought that this line will be useful to breed rice varieties with high storability after tested on agricultural traits.

• Genomics & Informatics
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• 제6권4호
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• pp.231-234
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• 2008

Precise and reliable identification of CNV is still important to fully understand the effect of CNV on genetic diversity and background of complex diseases. SNP marker has been used frequently to detect CNVs, but the analysis of SNP chip data for identifying CNV has not been well established. We compared various normalization methods for CNV analysis and suggest optimal normalization procedure for reliable CNV call. Four normal Koreans and NA10851 HapMap male samples were genotyped using Affymetrix Genome-Wide Human SNP array 5.0. We evaluated the effect of median and quantile normalization to find the optimal normalization for CNV detection based on SNP array data. We also explored the effect of Robust Multichip Average (RMA) background correction for each normalization process. In total, the following 4 combinations of normalization were tried: 1) Median normalization without RMA background correction, 2) Quantile normalization without RMA background correction, 3) Median normalization with RMA background correction, and 4) Quantile normalization with RMA background correction. CNV was called using SW-ARRAY algorithm. We applied 4 different combinations of normalization and compared the effect using intensity ratio profile, box plot, and MA plot. When we applied median and quantile normalizations without RMA background correction, both methods showed similar normalization effect and the final CNV calls were also similar in terms of number and size. In both median and quantile normalizations, RMA backgroundcorrection resulted in widening the range of intensity ratio distribution, which may suggest that RMA background correction may help to detect more CNVs compared to no correction.

• Food Science and Biotechnology
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• 제17권1호
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• pp.58-65
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• 2008

To see the possibility of irradiation as an alternative to ultra high temperature (UHT) sterilization, the quality characteristics of milk were analyzed. Milk treated by UHT ($135^{\circ}C$ for 4 sec) and irradiation at higher than 3 kGy showed no viable counts after 7 days of storage at $4^{\circ}C$. The contents of certain amino acids of milk, such as Arg, Asp, Glu, Ile, Leu, Lys, Pro, Ser, Thr, and Tyr, were lower in irradiated groups at 10 kGy than in UHT-treated one, but no difference was observed between irradiated milks at less than 5 kGy and UHT. The capillary electrophoresis (CE) patterns of the milk irradiated at 10 kGy showed a similar trend to the raw milk, low temperature long time (LTLT, $63^{\circ}C$ for 30 min), and high temperature short time (HTST, $72^{\circ}C$ for 15 sec) treated. However, the CE pattern of UHT-treated milk was different. Rennet coagulation test agreed with the CE results, showing that all milk samples were coagulated by rennet addition except for UHT-treated milk after 1 hr. These results suggest that irradiation of milk reduce the content of individual amino acids but it may not induce severe conformational change at a protein level when compared with UHT treatment.

• 한국자원식물학회지
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• 제25권6호
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• pp.670-681
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• 2012

Herb extracts commercially used in Korea were screened for PPAR-${\gamma}$ agonist test and ${\alpha}$-glucosidase inhibition assay. Total 16 herb plants had a PPAR-${\gamma}$ agonist activity. Specially, Alisma orientale Juz (108.41%), Ephedra sinica (98.22%), Sasa japonica Makino var. purpurascens Nakai (140.68%), Astragalus membranaceus Bunge (106.79%) and Cnidium officinale Makino (113.00%) showed high PPAR-${\gamma}$ agonist activity rate compared with rosiglitazone's (167.46%). And Cornus officinalis S. et Z. (90.3%), Cinnamomum cassia Blume (89.2%), Psoralea corylifolia L. (89.8%), Paeonia japonica (Makino) Miyabe (92.4%) and Paeonia suffruticosa Andr (93.2%), showed high ${\alpha}$-glucosidase inhibition rates. These results support previous reports of the efficacy of Oriental medicinal plants used for diabetes mellitus.

• Journal of Korean Biological Nursing Science
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• 제13권1호
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• pp.61-71
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• 2011

Purpose: The purpose of the present study was to investigate the prevalence, subtypes and risk factors of irritable bowel syndrome by ROME-III among Korean university students. Methods: This study was descriptive survey research. The sampls were 796 and variables were measured by structured questionaire. Rome-III criteria was used for diagnosis of IBS. The gathered data were analyzed with %, $x^2$-test, t-test, logistic regression by SPSS win 17.0. Results: The students with IBS were 61 (7.7%) and the most of the subtype was IBS-M (42.6%). Meal (times/day), breakfast, stress, quality of sleep, neuroticism, bodily pain, general health, social function, role emotional restriction, mental health, somatization, obcessive-compulsive state, depression, anxiety, hostility, global severity index, positive symptom distress index, positive symptom were significantly different between IBS group and non-IBS group. The prevalence of IBS was low in the higher score of role emotional in general health state. There were more 2 times students who had score of the obsessive-compulsive in psychological health over the 50 than below the 50 in IBS group. Conclusion: 7.7% of students were diagnosed by Rome-III criteria and the most of the sybtype was IBS-M. The risk factors of IBS were role emotional restriction, obsessive-compulsive state.

• 동아시아식생활학회지
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• 제15권1호
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• pp.100-105
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• 2005

This study was conducted to investigate the extraction characteristics of the polysaccharide from Jeseng mushroom (Fomitopsis pinicola Jeseng). Yields of the polysaccharide extracted from powdered mushroom by autoclaving(120, 30 min) with water at different pH and salt concentration were 8.2～9.2% in pH 5～11, 4.7～5.5% in 1～5% salt solution, respectively. The yield by the 0.05～1.0 N KOH-extraction was ranged 3.45～13.20%, while that by HAS-extraction(homogenizing after KOH swelling) using 1～2.5 N KOH 73.6～78.4%. Content of carbohydrate, protein, lipid and ash of the crude polysaccharide extracted from fruits body and its cultured mycelium by method of water extraction, KOH extraction(0.005～1N) and HAS-extraction were ranged 86.5～92.6%, 2.3～13.1%, 0.1～4.2% and 0.1～1.7%, respectively. The polysaccharide were composed of 62.0～77.8 g/g of pentose, 138.0～187.8 g/g of hexose and 21.2～117.3 mg/g of protein. From these results, the polysaccharide extracted was supposed to be a protein-bound polysaccharide.

• JSTS:Journal of Semiconductor Technology and Science
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• 제17권3호
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• pp.411-424
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• 2017

An all-digital delay-locked loop (DLL) for a mobile memory interface, which runs at 0.11-2.5 GHz with a phase-shift capability of $180^{\circ}$, has two internal DLLs: a global DLL which uses a time-to-digital converter to assist fast locking, and shuts down after locking to save power; and a local DLL which uses a phase detector with an adaptive phase sampling window (WPD) to reduce jitter accumulation. The WPD in the local DLL adjusts the width of its sampling window adaptively to control the loop bandwidth, thus reducing jitter induced by UP/DN dithering, input clock jitter, and supply/ground noise. Implemented in a 65 nm CMOS process, the DLL operates over 0.11-2.5 GHz. It locks within 6 clock cycles at 0.11 GHz, and within 17 clock cycles at 2.5 GHz. At 2.5 GHz, the integrated jitter is $954fs_{rms}$, and the long-term jitter is $2.33ps_{rms}/23.10ps_{pp}$. The ratio of the RMS jitter at the output to that at the input is about 1.17 at 2.5 GHz, when the sampling window of the WPD is being adjusted adaptively. The DLL consumes 1.77 mW/GHz and occupies $0.075mm^2$.

• 한국지구과학회지
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• 제41권2호
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• pp.147-154
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• 2020

이 연구의 목적은 초등학교 학생들의 과학에 대한 인식론적 신념을 분석하여 그들의 과학의 목적, 과학 지식의 본성, 과학 지식의 근원, 과학에서의 실험의 역할에 대한 신념의 특징을 알아보고자 하는 것이다. 본 연구의 대상은 S시에 위치한 K 초등학교 4-6학년 학생 99명이고, 과학에 대한 인식론적 신념을 검사하기 위한 도구로 Elder(1999)가 그의 연구에서 제시한 과학에 대한 인식론적 신념을 구성하는 요소로 이루어진 검사지를 번안하여 사용하였다. 설문지 응답을 분석한 결과는 다음과 같다. 첫째, 과학의 목적에 대한 인식론적 신념을 분석한 결과, 6학년이 가장 현대적인 신념을 보유하고 있었다. 둘째, 과학 지식의 본성에 대한 신념의 경우, 4학년이 5, 6학년과 통계적으로 유의미한 차이를 보였다. 셋째, 과학 지식의 근원과 과학에서의 실험의 역할에 대한 신념을 통계적으로 유의미한 차이를 나타내지 않았다.

• 대한디지털의료영상학회논문지
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• 제9권1호
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• pp.53-65
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• 2007

PACS has been run at the Kyung Hee University Medical Center(KHMC) since 2001, and the installation and operation of PACS have contributed to automation and quantification of KHMC's medical environment During these five years our greatest concern is how to make our own guiding principle of diagnostic monitor QA which is adapted to international standards. In accordance with the terms of 'KHMC QA Guideline', 'AAPM TG18', 'SMPTE RP133', 'DICOM Part14', 'DIN V 6868-57', 'JESRA X-0093', 'JIS Z4752-2-5' and 'KCARE', concern about quality assurance of medical images are on the increase. With the investigation of acceptance testing and quality control of international standards for medical display devices, and data collection and analysis for recommended guideline, it is reported that acceptance testing(quality control), including geometrical distortion, display reflection, luminance response, luminance uniformity, display resolution, display noise, veiling glare and color chromaticity being adequate and effective to domestic hospital environments for medical display devices and assessment methods according to each performance. Accordingly, KHMC classified the checkpoint items by period, at the time of monitor setting, monthly, quarterly, half-yearly and annually. Periodic classification of checkpoint items for monitor QA makes a good guideline for image QA/QC and useful guideline for persistent good quality of monitor.