• 한국인터넷방송통신학회논문지
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• 제17권4호
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• pp.71-76
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• 2017

사물을 분석하고 인지하는 분야에 해당하는 시지각은 시각의 생리학적인 측면과 시각체계의 인지적 측면에 대해 많은 연구가 이루어져 있으며 이를 바탕으로 설립된 시지각 이론이 각 분야별로 다양한 응용 가능성을 모색하고 있는 실정이다. 그러므로 뉴미디어 시대의 대표적 사례물 중 하나인 모바일 디스플레이가 강조되는 가운데, 시지각 연구를 기반으로 하여 보다 효용성 있는 시각적 인지 기반의 비중을 늘려야 한다는 인식이 본 연구의 기본적인 이해이다. 본 연구는 모바일 디스플레이를 대상으로 하여 조도와 배경의 밝기에 따른 가독성 관련 실험을 진행하고 이를 분석하였다. 이를 위해 두 가지 조건에 해당하는 조도의 환경 조건과 기존 모바일 디스플레이에서 가독성 향상 방안으로 제안되는 두 가지 배경의 밝기 조건을 대상으로 하여 가독성 관련 실험을 진행하였다. 본 연구에서 진행된 실험결과를 분석하여 조도와 배경의 밝기에 따른 가독성에 대해 유의미 여부를 정의하고 가독성 향상을 위한 방안을 제시한다.

• 한국환경과학회지
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• 제25권1호
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• pp.99-105
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• 2016

In this paper, a groundwater hydrological study of the Gyeongju well during the Silla period is conducted to investigate how sufficiently the Gyeongju well supplied water demand at the time. It is assumed that the current geology and soil condition in Gyeongju remain similar to the Silla period. Also, the land use and land coverage during the Silla period is estimated based on the current land condition in Gyeongju. Precipitation during the Silla period is analyzed using precipitation data from 1984 to 2014 provided by Gyeonju weather station. Precipitation analysis is applied based on 3 different scenarios; precipitation intensity during the Silla period was Case (1) the same as, Case (2) 30% more, and Case (3) 30% less than the precipitation intensity of the last decade (2005~2014). Furthermore, to observe the use of the well in Gyeongju during droughts, the following condition(Case (4)) is also considered; ten year drought during the Silla period was the same as the ten year drought from 1984 to 2014. Available amount of groundwater development is analyzed using NRCS-CN method. The results show that the potential amount of groundwater in Gyeongju during Silla era was for Case (1) $62,825,272m^3/year$, Case (2) $93,606,567m^3/year$, Case (3) $32,277,298m^3/year$, and Case (4)$32,870,896m^3/year$. Also, it has been shown that $45,260,000m^3$ of groundwater were required to supply to all households in Gyeongju during Silla era. Therefore, if the precipitation intensity during Silla era was similar with the last decade, the groundwater would provide enough supply to all households in Gyeongju. However, in the case that the precipitation intensity during Silla era was 30% less than the last decade or a ten year drought happened, it is predicted that the water use in Gyeongju would have been limited.

• 지질공학
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• 제16권3호
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• pp.275-282
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• 2006

본 연구는 모형실험장치를 이용하여 인공강우에 의한 산사태 발생특성과 사태물질의 확산거동특성을 파악하기 위하여 수행되었다. 본 연구에서는 강우강도와 사면경사의 변화에 따른 다양한 실험조건하에서 일정 시간 간격으로 간극수압, 사면붕괴양상 및 변위, 그리고 토사의 확산면적 등을 각각 측정하였다. 실험 중 복수의 비디오 카메라와 디지털 스틸카메라로 촬영한 후, 이미지 분석을 실시하여 시간대별 산사태 발생양상 및 사태물질 확산특성 자료를 취득하였다. 실험결과에 따르면, 간극수압은 강우강도 및 사면경사에 비례하여 변화하며 이에 따라 강우강도 및 사면경사가 커짐에 따라 산사태가 발생할 가능성도 증가하였다. 사태물질의 확산면적은 강우강도, 강우지속시간, 그리고 사면경사의 증가에 비례하는 양상을 가짐을 확인하였다.

• 한국전자거래학회지
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• 제22권2호
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• pp.153-168
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• 2017

최근 주식의 수익률과 거래량을 설명하는 요인 중 하나로 투자자들의 관심이나 주식관련 정보 전파의 효율성 등이 중요하게 인식되고 있다. 또한 기업관련 정보가 투자자들에게 투명하게 전파되지 않을 때 기업 주가의 급락(crash) 위험을 증가시킨다는 연구 결과들이 축적되고 있다. 본 연구에서는 네이버 트렌드를 이용하여 포털에서의 검색 강도가 증가하는 것이 주식 수익률의 급락에 어떤 영향을 미치는지를 분석하였다. 다양한 주가급락 위험의 측정변수와 검색 강도 측정치를 이용한 분석에서 포털 검색강도가 상대적으로 높은 기업-연도에서 주가 급락의 위험이 감소하는 것으로 관찰되었다. 이러한 결과는 기업 관련 정보 전파가 투자자들에게 효율적으로 이루어지지 않을 때 미래의 주가급락을 초래한다는 논의와 일치하는 결과이다. 또한 이러한 결과는 분석에 발생가능한 내생성을 통제한 후에도 유의하게 성립하는 것으로 관찰되었다.

• 대한간호학회지
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• 제46권3호
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• pp.400-408
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• 2016

Purpose: This study was done to identify frequency, intensity of urinary dysfunction and daily life distress in women after a radical hysterectomy for cervical cancer. Methods: One hundred and fifty seven women who had undergone a radical hysterectomy and one hundred and sixty five women as healthy controls completed questionnaires on intensity of urinary dysfunction and daily life distress caused by urinary dysfunction. Results: Women with cervical cancer showed higher frequency of urinary dysfunction than healthy controls. Major urinary dysfunction for women with cervical cancer in order of frequency were night-time incontinence (odds ratio=10.39, p<.001), difficulty in starting urination, weak urine stream and sense of incomplete emptying of bladder. The highest score on intensity was difficulty in starting urination, followed by urgency, weak urine stream, daytime frequency and sense of incomplete emptying. Night-time incontinence was the urinary symptom causing the most daily life distress for cervical cancer women followed by difficulty in starting urination, urgency, sense of incomplete emptying, and night-time frequency. Conclusion: Results suggest that nurses should address the potential postoperative urinary complications and develop long term interventions to decrease urinary dysfunction and daily life distress for women who have had a radical hysterectomy for cervical cancer.

• Animal Bioscience
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• 제34권5호
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• pp.811-823
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• 2021

Objective: Eggshell color is an important indicator of egg quality for consumers, especially for brown eggs. Various factors related to laying hens and their environment affect brown eggshell coloration. However, there have been no studies investigating hepatic functions of laying hens with variable intensity of brown eggshell color. Therefore, this study was aimed to identify potential factors affecting brown eggshell coloration in aged laying hens at the hepatic transcriptomic level. Methods: Five hundred 92-wk-old Hy-line Brown laying hens were screened to select laying hens with different intensity of brown eggshell color based on eggshell color fans. Based on eggshell color scores, hens with dark brown eggshells (DBE; eggshell color fan score = 14.8) and hens with light brown eggshells (LBE; eggshell color fan score = 9.7) were finally selected for the liver sampling. We performed RNA-seq analysis using the liver samples through the paired-end sequencing libraries. Differentially expressed genes (DEGs) profiling was carried out to identify their biological meaning by bioinformatics. Results: A total of 290 DEGs were identified with 196 being up-regulated and 94 being down-regulated in DBE groups as compared to LBE groups. The Kyoto encyclopedia of genes and genomes (KEGG) analysis revealed that these DEGs belong to several biological pathways including herpes simplex infection (toll-like receptor 3 [TLR3], cyclin-dependent kinase 1, etc.) and influenza A (TLR3, radical S-adenosyl methionine domain containing 2, myxovirus [influenza virus] resistance 1, etc.). Genes related to stress response (ceremide kinase like) and nutrient metabolism (phosphoenolpyruvate carboxy-kinase 1, methylmalonic aciduria [cobalamin deficiency] cblB type, glycine receptor alpha 2, solute carrier family 7 member 11, etc.) were also identified to be differentially expressed. Conclusion: The current results provide new insights regarding hepatic molecular functions related to different intensity of brown eggshell color in aged laying hens. These insights will contribute to future studies aiming to optimize brown eggshell coloration in aged laying hens.

• 한국축산식품학회지
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• 제43권1호
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• pp.85-100
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• 2023

The present study aimed to evaluate the effects of high-intensity ultrasound (HIU) application on meat quality traits, sensory parameters, and the microstructure of semitendinosus muscle from Hanwoo cattle. The samples were treated in an ultrasonic bath (35 kHz) at an intensity of 800 W/cm² for 60 min, followed by aging at 1℃ for 0, 3, and 7 days. The application of ultrasound resulted in lower Warner-Bratzler shear force and higher myofibrillar fragmentation index values during the storage period. HIU also enhanced the tenderness, flavor, umami, and overall acceptability of cooked beef muscle. However, the electronic tongue evaluation results showed higher umami values in the control treatment on the seventh day of storage. The microstructure of sonicated meat showed disorganized myofibrillar architecture and swelling in the A-band region of sarcomeres during the storage period, which led to greater meat tenderness. The heatmap illustrated the high abundance of α-linolenic acid (C20:5n3) and eicosapentaenoic acid (C18:3n3) in sonicated meat samples on the third day of the storage. These results showed that HIU is a potential method for tenderizing and improving the sensory attributes of beef without compromising other quality aspects.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2023년도 학술발표회
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• pp.170-170
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• 2023

Providing safe and readily available water is vital to maintain public health. One of the most prevalent methods to prevent the spread of waterborne diseases is applying chlorine injection to the treated water before distribution. During the water transmission and distribution, the chlorine will experience a reduction, which can imply potential risks for human health if it falls below the minimum threshold. The ability to determine the appropriate initial intensity of chlorine at the source would be significant to prevent such problems. This study proposes two methods that integrate hydraulic and water quality modeling to determine the suitable intensity of chlorine to be injected into the source water to maintain the minimum chlorine concentration (e.g., 0.2 mg/l) at each demand node. The water quality modeling employs the first-order decay to estimate the rate of chlorine reduction in the water. The first method utilizes a backtracking algorithm to trace the path of water from the demand node to the source during each time step, which helps to accurately determine the travel time through each pipe and node and facilitate the computation of time-dependent chlorine decay in the water delivery process. However, as a backtracking algorithm is computationally intensive, this study also explores an alternative approach using a water age. This approach estimates the elapsed time of water delivery from the source to the demand node and calculate the time-dependent reduction of chlorine in the water. Finally, this study compares the outcomes of two approaches and determines the suitable and effective method for calculating the chlorine intensity at the source to maintain the minimum chlorine level at demand nodes.

• Journal of Microbiology and Biotechnology
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• 제33권2호
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• pp.260-267
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• 2023

In this study, we sought to improve lutein and zeaxanthin production in Mychonastes sp. 247 and investigated the effect of environmental factors on lutein and zeaxanthin productivity in Mychonastes sp. The basic medium selection and N:P ratio were adjusted to maximize cell growth in one-stage culture, and lutein and zeaxanthin production conditions were optimized using a central composite design for two-stage culture. The maximum lutein production was observed at a light intensity of 60 μE/m²/s and salinity of 0.49%, and the maximum zeaxanthin production was observed at a light intensity of 532 μE/m²/s and salinity of 0.78%. Lutein and zeaxanthin production in the optimized medium increased by up to 2 and 2.6 folds, respectively, compared to that in the basic medium. Based on these results, we concluded that the optimal conditions for lutein and zeaxanthin production are different and that optimization of light intensity and culture salinity conditions may help increase carotenoid production. This study presents a useful and potential strategy for optimizing microalgal culture conditions to improve the productivity of lutein and zeaxanthin, which has applications in the functional food field.

• Genomics & Informatics
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• 제10권2호
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• pp.128-132
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• 2012

To learn the differences between the structure-activity relationship and molecular vibration-activity relationship in the ligand-receptor interaction of the histamine receptor, 47 ligands of the histamine receptor were analyzed by structural similarity and molecular vibrational frequency patterns. The radial tree that was produced by clustering analysis of molecular vibrational frequency patterns shows its potential for the functional classification of histamine receptor ligands.