• 한국토양비료학회지
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• 제46권1호
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• pp.32-39
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• 2013

The relationship between relative water contents of lettuce leaves and biochemical activities in lettuce was examined in this study to explore an adaptation response of lettuce to water stress from soils. Soil water contents and relative water contents of leaves were positively related to show $R^2$=0.8728. Hydrogen peroxide contents of leaves rapidly increased with reduction of soil water content, whereas soluble protein contents and dry matters rapidly decreased. And chlorophyll a and b contents of leaves decreased with increase in carotenoid content. Furthermore, the activities of ascorbate peroxidase (APX), monodehydroascorbate reductase (MDHAR), and dehydroascorbate reductase (DHAR) increased dramatically, and mRNA transcript levels of APX, MDHAR and DHAR also increased. Relationship of relative water content of lettuce leaves to hydrogen peroxide, to ascorbate peroxidase activity, to dehydroascorbate reductase activity, and to monodehydroascorbate reductase activity was shown to be positively correlated. It is highly plausible from this study that these enzyme activities could be developed as an indicator of water states in soils.

• Ocean and Polar Research
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• 제44권3호
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• pp.261-267
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• 2022

We derived a length-weight relationship for Calanus sinicus off Busan, Korea in spring to estimate the biomass of the C. sinicus population around Korean waters, and compared it with the previously derived equations. The developmental stages and prosome length of C. sinicus used in the relationship ranged from 1,376-1,540 ㎛ for copepodite 4 (CIV), 1,753-1,971 ㎛ for copepodite 5 (CV), and 2,160-2,283 ㎛ for adults (CVI). Dry weight and carbon content were measured from a total of 26 replicates. Length-weight relationships derived in the present study are as follows: log C = 3.342 log PL - 9.449, log DW = 3.394 log PL -9.219, where C is carbon content (㎍), DW is dry weight (㎍), and PL is prosome length (㎛). When comparing the present regression equation of length-weight for C. sinicus with the previous one, our regression equation showed an average carbon estimate to a given range of mean prosome length. The length-weight relationship of C. sinicus in the present study can be used to better estimate the biomass of the C. sinicus population in the coastal waters of Korea.

• 한국지반환경공학회 논문집
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• 제12권3호
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• pp.63-67
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• 2011

실무에서 불포화토의 적용이 증가하고 있다. 불포화토의 가장 큰 특징은 체적함수비와 모관흡수력의 관계를 나타내는 함수특성곡선이다. 일반적으로 체적함수비는 측정의 어려움으로 인하여 중량함수비를 측정한 후 관계식을 통하여 체적함수비를 구한다. 이 경우 흙의 간극과 비중을 이용하여 관계식이 성립되는데 사실 물은 흙 입자 자체에도 포함되어 있다. 그러므로 실제 체적함수비는 중량함수비를 관계식으로 변화한 값과 다르게 된다. 본 연구에서는 실험을 통하여 얻어진 흙 입자의 흡수율을 고려하여 체적함수비와 중량함수비의 관계를 제시하는 데 있다.

• 한국기록관리학회지
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• 제22권4호
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• pp.151-174
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• 2022

기록 기술은 기록의 검색과 이용에 필수적인 도구로써 기록의 활용에 있어 핵심적이다. 콘텐츠 서비스는 기록의 활용과 콘텐츠의 중요성이 강조되는 현대 사회에서 핵심적인 서비스다. 이 연구에서는 기록 기술과 콘텐츠 서비스를 다른 영역으로 볼 것이 아니라 상호보완적으로 발전할 수 있는 관계로 보았다. 기록 기술이 풍부하게 갖추어져 있으면 이를 기반으로 양질의 콘텐츠를 제작할 수 있고, 이렇게 만든 콘텐츠를 다시 기록 기술과 연계하여 기록 기술을 더욱 풍부하게 만들 수 있다. 이 연구에서는 기록 기술과 콘텐츠 서비스의 상호보완적 관계 밝히고, 이를 기반으로 한 고도화 방안을 제안하고자 한다. 이를 위해 국가기록원과 대통령기록관 웹사이트의 기록 기술 및 콘텐츠 서비스 현황과 문제점을 분석했고, 이와 비교할 모범사례로 영국의 TNA와 미국의 NARA, 서울기록원과 민주화운동기념사업회 오픈아카이브를 선정하였다. 6개의 기관을 분석한 시사점을 바탕으로 기록 기술과 콘텐츠 서비스 각각의 고도화방안과 상호보완적 발전방안을 함께 제안하였다. 이 연구를 통해 기록 기술과 콘텐츠 서비스가 상호보완적 방향으로 발전하길 기대해본다.

• 대한가정학회지
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• 제50권2호
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• pp.93-107
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• 2012

The purpose of this study was to investigate the effect of relationship benefit on consumer's purchase intention by focusing on the mediating role of interaction in internet shopping malls. The survey research was limited to respondents over 20 years old living in Seoul and other metropolitan areas who had purchased fashion products thru internet shopping malls. 562 data were analyzed by descriptive statistics, factor analysis, reliability analysis, and multiple regression using SPSS program. The results indicated that each relationship benefit dimension had a significantly positive effect on consumer's purchase intention. The interaction between internet shopping malls and the consumer was categorized by two factors such as content-people interaction and people-people interaction. In addition, each interactive factor showed mediating effects between relationship benefits and consumer's purchase intention.

• Journal of Information Technology Applications and Management
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• 제22권2호
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• pp.43-70
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• 2015

Concerns have been growing about whether domestic internet protocol television (IPTV) can establish a solid foothold in the pay TV market, largely because of the lack of IPTV-only content and service differentiation. It has been difficult for IPTV providers to attract valuable PPs (program providers) to strengthen their positions, and IPTV providers have invested much money into procuring content. To survive this difficult situation, IPTV providers need to reappraise their profit sharing methods and content distribution structure to facilitate the expansion of their subscriber base. This can be done by attracting valuable PPs to IPTV providers and securing extra revenue by distributing more content for their PP partners. The IPTV industry has a different structure and value chain from the digital cable industry. Moreover, profit sharing schemes among participants in the IPTV industry are complicated. Thus it is essential to analyze the criteria for profit sharing, the selection of attributes in profit sharing, and their cause-effect relationship in developing fair pricing for broadcast content in the IPTV industry. This study introduces the attributes that need to be considered for the pricing of content and profit sharing among IPTV providers and PPs. In addition, this study uses system dynamics to analyze the relationship among those attributes along with additional associated factors for the pricing of content.

• 대한소아치과학회지
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• 제1권1호
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• pp.9-17
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• 1974

The purpose of this study was to clarify the relationship between dental caries status, and the content of fluoride in drinking water, and the content of fluoride in enamel of deciduous teeth of Korean children. The specific areas selected in this study were Asan-Kun and Seouchon-Kun (Chung Cheoung Nam-Do) where the fluoride content in the deep well water were 0.9 ppm and 0.4 ppm respectively. The dental caries status of 720 children aged 6 to 11 who have been lived since birth was detected. The following results were obtained upon this study: 1. The def person rate, deft rate and def index of the Asan-Kun children were revealed 46.11%, 14.41% and 1. 69 respectively. The fluoride content in the outer layer of enamel was 430 ppm. 2. The def person rate, deft rate and def index of the Seouchon-Kun children were revealed 59.17%, 20.97% and 2.40 respectively. The fluoride content in the outer layer of enamel was 391 ppm. 3. The def person rate, deft rate and def index of the Asan-Kun children were showed lower value than the Seouchon-Kun children. The fluoride content of the outer layer of enamel of the Asna-Kun children were showed higher value than the Seouchon-Kun children.

• 기술혁신연구
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• 제26권4호
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• pp.122-145
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• 2018

본 연구는 R&D인력이 경험하는 경력정체를 구조적 정체와 직무내용 정체로 구분하여 조직몰입과 관계를 규명하면서, 추가적으로 개인의 연령 및 창의적 행동특성이 경력정체와 조직몰입의 관계에 미치는 조절효과를 분석하는데 초점을 두고 있다. 국내 정부출연 연구기관에 근무하는 418명의 R&D 인력을 대상으로 실증 분석한 결과, 첫째 구조적 정체와 조직몰입의 관계는 연령에 따라서 차이를 보인다. 즉, 주니어 R&D인력일수록 구조적 정체가 조직몰입을 감소시키는 효과가 강하게 나타났다. 둘째 직무내용 정체는 조직몰입에 부정적인 영향을 미치며 개인의 창의적 행동특성에 따라서 차이를 보인다. 즉, 창의적 행동특성이 강한 R&D인력의 경우에 직무내용 정체와 조직몰입의 부정적 관계가 더욱 강하게 나타났다. 이러한 분석결과를 바탕으로 R&D인력의 경력정체 이슈에 관한 이론적인 함의 및 실무적 시사점에 대해 논의하였으며, 끝으로 연구의 한계점 및 향후 연구방향을 제시하였다.

• 농업과학연구
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• 제43권2호
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• pp.240-248
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• 2016

Radish is a common vegetable consumed in Korea, Japan, and China. Radish Breeding has been conducted based on morphological properties, such as shape and color. Recently, physicochemical properties of radish are attracting more attention from breeders to develop cultivars for the retail market. In this study, major components of radish were determined and their relationship with textural property analyzed. Sixty-six radish cultivars were selected and divided into white head (WH) and green head (GH) according to their head color. The cutting forces of GH and WH groups were $2.17{\pm}0.34kg$ and $2.31{\pm}0.36kg$, respectively (P > 0.05). The starch contents of GH and WH were $3.75{\pm}0.39g\;per\;100g$ (dry basis) and $4.24{\pm}0.62g$, respectively. Cellulose contents in both groups were similar at 12.3-12.4 g per 100 g (dry basis). Pearson correlation coefficients between cutting force, cellulose content, and starch content ranged from -0.33-0.326 which does not demonstrate any strong correlation between these components. Therefore, no relationship was found between the cutting force and the starch content or the cellulose content for the cultivars analyzed in this study. As the first intensive study on the texture and the major components of radish, these results could provide valuable information for radish breeding if further studies on taste and nutrient components are conducted.

• Journal of Biosystems Engineering
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• 제14권1호
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• pp.33-40
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• 1989

The flow properties of water added com-cob-mix(CCM) were studied in order to provide basic information for designing its pumping system. For the study, a model system similar to actual situation was constructed. From the experiment, it can be concluded that the flow properties of the water added CCM has close relationship with its moisture content as follows; 1. The pressure drop caused by friction was very low when the moisture content of water added CCM was more than 70%. However, when the moisture content of the material is about 60%, the pressure drop increases up to 10 kPa/m at low pumping speed, and 20 kPa/m at high pumping speed, respectively. 2. The water added CCM having about 65% moisture content showed pseudo-plastic flow characteristics. 3. As the moisture content of the material decreases, the shear stress increases more rapidly than the shear rate does. Finally, below approximately 60% moisture, the shear stress becomes a linear relationship with the shear rate. 4. It was possible to pump the material having the moisture content down to 58% through a pipe having 80 mm diameter by a pump operating at 234 rpm. However, by either increasing the diameter of the pipe or decreasing the pumping speed, it can be possible to pump the material having lower moisture content than 55%.