• Fisheries and Aquatic Sciences
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• 제1권1호
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• pp.113-121
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• 1998

A relationship between sea level variations in the Korea Strait (the western and the eastern channels) and the Tokara Strait in the Kuroshio region is examined using daily-mean sea level data from 1966 to 1986. The seasonal variation of the sea level difference (SLD) between Izuhara and Pusan (the western channel) is most periodic: the positive anomalies appear from summer to autumn, and the negative anomalies from winter to spring year to year, whereas SLDs neither between Hakata and Izuhara (the eastern channel) nor between Naze and Nishinoomote (the Tokara Strait) show such a periodic variation. Much similarity has been found between SLDs in the eastern channel and the Tokara Strait, and in particular they were closely correlated in a special event of the Kuroshio region, such as a large meander of the Kuroshio. This paper shows that the periodic seasonal variation of the SLDs in the western channel should be less related to the Kuroshio region. This result also implies that the variation of SLD in the western channel is largely influenced by local factors, such as the bottom cold water in the western channel in summer, rather than from the Kuroshio region.

• The Korean Journal of Ecology
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• 제19권6호
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• pp.563-573
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• 1996

Macroinvertebrate contribution to the leaf litter breakdown of Carpinus cordata was estimated at headwater streams at Mt. Jumbong (38°03'N, 128°25'E) during spring and winter spring by using two types of litter bag. Coarse-mesh bags with 10 g of leaf letter were placed in a 1st-order stream in April (the spring experiment) and December 1995 (the winter-spring experiment). Fine-mesh bags with 5 g of leaf letter were placed in a nearby 3ed-order steam. The breakdown of Carpinus in coarse-mesh bags was rapid, and, in terms of season, leaf litter processed rapidly during spring. daily mass loss rates of leaf litter (-k±1 SE) were highest for coarse-mesh bags in the spring experiment (-0.0429±0.0048), followed by coarse-mesh bags in the winter-spring (-0.0146±0.0014), fine-mesh bags in the spring (-0.0078±0.0004), fine-mesh bags in the winter-spring experiment (-0.0054±0.0005). Macroinvertebrate contribution to the litter breakdown was estimated by the difference of % leaf letter remaining between coarse -mesh bage and fine-mesh bags. Although shredders were more abundant during the winter-spring, their contribution was greater during the spring (50%) than the winter-spring (22∼33%). This result appeared to be due to the change in the chemical composition of leaf letter during processing, and to the seasonal growth patterns of major shredder taxa.

• Food Science and Biotechnology
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• 제16권2호
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• pp.325-328
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• 2007

Mesophilic aerobic bacterial counts were measured and compared for seasoned soybean sprouts produced in different seasons and sold in different market types. Very significant differences in microbial counts were found among seasoned soybean sprouts produced in different seasons (winter, spring, and summer) and among different market types (a traditional market, discount store, and department store). However, there was no significant difference among the stores within each market group. The interactions were significant at a 1% significance level. The variance of summer counts was much lower than spring and winter counts. Discount and department stores showed a higher variation in microbial counts than traditional markets. The microbial counts differed substantially from season to season in the same market group (summer > spring > winter) except between spring and summer in traditional markets. The microbial loads in the winter and spring seasons of seasoned soybean sprouts in traditional markets were clearly higher than in other market groups, while discount stores had the highest microbial count in summer.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2020년도 학술발표회
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• pp.118-118
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• 2020

This study investigates the change of flow characteristics over 10 Asian river basins in the past 30 years (1976-2005). The variation is estimated from The Soil and Water Assessment Tool (SWAT) model outputs based on reanalysis data which was bias-corrected for Asian monsoon reagion. The model was firstly calibrated and validated using observed data for daily streamflow. Four statistical criteria were applied to evaluate the model performance, including Coefficient of determination (R2), Nash - Sutcliffe model efficiency coeffi cient (NSE), Root mean square error-observations standard deviation ratio (RSR), and Percentage Bias (PBIAS). Then parameters of the model were applied for the historical period 1976-2005. The estimates show a temporal non-considerable increasing rate of daily streamflow in most of the basins over the past 30 years. The difference of monthly discharge becomes more significant during the months in the wet season (June to September) in all basins. The seasonal runoff shows significant difference in Summer and Autumn, when the rainfall intensity is higher. The line showing averaged runoff/rainfall ratio in all basins is sharp, presenting high variation of seasonal runoff/rainfall ratio from season to season.

• 대기
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• 제20권4호
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• pp.437-449
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• 2010

The relocation effect of observation station (REOS) on the homogeneity of seasonal mean of maximum and minimum temperature, diurnal temperature range (DTR) and relative humidity (RH) was investigated using surface observation data and document file. Twelve stations were selected among the 60 stations which have been operated more than 30 years and relocated over one time. The data from Chunpungryeong station were used as a reference to separate the impacts of station relocation from the effects caused by increased green house gases, urbanization, and others. The REOS was calculated as a difference between REOS of relocated station and REOS of reference station. Although the REOS is clearly dependent on season, meteorological elements, and observing stations, statistically significant impacts are found in many stations, especially the environment of observing station after relocation is greatly changed. As a result, homogeneity of seasonal mean of meteorological elements, especially DTR and RH, is greatly reduced. The results showed that the effect of REOS, along with the effect of urbanization, should be eliminated for the proper estimation of climate change from the analysis of long-term observation data.

• 한국식생활문화학회지
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• 제20권2호
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• pp.273-282
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• 2005

The purpose of this study was to nut a survey on the seasonal menu and consumer's acceptance test of free meals for the elderly facility in Sungnam Region. The elderly meals of the free lunch meal service were mainly composed of staple food, hot soup, and three kinds of side dishes. Questionare for accentance test was developed based on the seasonal menu including 13 kinds of cooked rices, 43 kinds of soups and 94 kinds of side dishes. The test was run for 104 elderly living and receving the service in the area. Average age of the subjects was 75.9 and 43% was male 57% was female. The 81% and 88% of the subject answered 'yes' on the intake of breakfast and dinner respectively representing high percentages of regular meal habits of the elderly. The cooked rice with black beans had significantly the highest acceptance score among the rice group and soups prepared with chunggukjang and cabbage had higher accentance scores(P<0.05). In the side dish groups, broiled eed, croakers, and various kinds of namuls had relatively higher scores than the others with significant difference at P<0.05.

• 한국초지조사료학회지
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• 제14권3호
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• pp.201-205
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• 1994

The objectives of this research are to determine the seasonal and varietal differences of total digestible nutrients(TDN) and in vitro dry matter digestibility(1VDMD) of tall fescue grown in Takwalyon areas, based on the data of preceding paper(Lee et al. 1994b). The results are may be summarized as follows : 1. The values of total digestible nutrients(TDN) and in vitro dry matter digestibility(1VDMD) in 1st cutting were lower than the values of 2nd and 3rd cutting, and it was due to different stages of growth and seasonal difference of climatic conditions in this areas. 2. The relative yield(RY) had negative significantly correlation with in vitm dry matter digestibility(1VDMD) of 1st cutting. 3. Total digestible nutrients(TDN) indicated high positive significant correlation with in vitro dry matter digestility (IVDMD) in all cuttings. 4. The variety of Johnstone showed a high values of total digestible nutrients(TDN) and in vitm dry matter digestibility(1VDMD) of 2nd and 3rd cutting, but Fuego was lower than the other varieties.

• 한국해안·해양공학회논문집
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• 제20권6호
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• pp.540-552
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• 2008

STA 기법을 이용하여 낙동강 하구역의 계절적인 토사이동경로를 예측하였고 기존의 STA 기법들을 유연하게 적용하기 위해서 eCSedtrend 모형을 사용하였다. 계절적인 토사이동 경로의 분석 결과 낙동강 하구역에서 탁월하게 나타나는 경향은 CB+와 CB-의 경향으로 조사되었다. CB+ 경향의 경우 니질 퇴적물이 분포하는 지역에서 넓게 나타났고 북쪽으로 향하는 수송벡터를 형성하였다. 그리고 CB- 경향의 경우 사질퇴적물이 분포하는 사주 부근에서 대부분 나타나며 계절별로 차이를 보이지만 주로 북쪽으로 향하는 경향벡터를 형성함을 볼 수 있었다.

• 한국유기농업학회지
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• 제29권2호
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• pp.187-207
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• 2021

This study examined the perception of farmers who employ foreign workers. A survey was conducted on 110 farms, and the main research results are as follows. First, as many farmers hire foreign workers in informal ways other than the employment permit system or seasonal worker programs, it is important to increase the number of registered foreign workers through the employment permit system or seasonal worker programs. Second, it is important to improve farmers' perception of compliance with the minimum wage, as some farmers pay wages below the legal minimum wage. Third, the subjective productivity evaluation results of farmers showed that the difference in labor productivity between foreigners and foreigners was not significant. This means that hiring foreign workers is due to other factors such as ease of management and cost rather than productivity. Fourth, many farmers were willing to hire existing foreign workers even if they paid extra wages after the expiration of the employment permit system. Finally, promotion and improvement of the additional system for foreign workers' workplaces are needed to solve problems caused by foreign employment during off-farming season.

• 대한건축학회논문집:구조계
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• 제34권5호
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• pp.51-58
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• 2018

The purpose of this study was to analyze the effect of seasonal change in characteristics of hygiene activity on domestic hot water energy consumption. With 16 residents of 4 households, the data about frequency of hygiene activity and water temperature was collected from February to August, 2017. The results of collected data discovered that the frequency of hygiene activity was higher especially in summer, whereas the consumption of warm water they used was higher in winter. The seasonal change in characteristics of hygiene activity was analyzed to be changed and strongly influenced by outdoor temperature. The influence of characteristics of hygiene activity on hot water consumption was analyzed. There was 13% of difference between consumption that was calculated taking characteristics of hygiene activity into account and consumption that was not. Therefore, this study suggested hygiene activity schedule, hot water profile and hot water consumption pattern, which can be utilized for improving simulation as well.