• Journal of Advanced Marine Engineering and Technology
• /
• v.38 no.10
• /
• pp.1225-1231
• /
• 2014

This paper presents the performance characteristic of a Francis hydro turbine with an inline casing. This turbine is designed for city water supply system. Due to large changes in ground elevation with high points and low points, some systems may experience larger-than-normal required pressures in areas with low ground elevations. One way to dissipate these excess pressures is by the use of an inline-turbine instead of an inline-pressure reducing valve. For best applicability and minimal space consumption, the turbine is designed with an inline casing instead of the common spiral casing. As a characteristic of inline casing, the flow accesses to the runner in the radial direction, showing a low efficiency. The installation of vanes improves the internal flow and gives the positive encouragement to the output power. For the power transmission to the outside of the turbine casing from the runner axis, a belt passage is designed in the inline casing, as its influence, the region after the belt passage shows a relatively low output power. The clearance gap in the runner side space is considered, in which a small volume of flow is contracted into the clearance gap, forming the leakage flow. The leakage flow leads to a decrease in the efficiency.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2013.06a
• /
• pp.209-213
• /
• 2013

The expense Our country's land logistics system is becoming backlog day by day. The greenhouse gas which it discharges specially from the vehicle causes a ecocide and traffic expense to make. The traffic energy curtailment which the government enforces during that time and environment-friendly green goods policy lost the effect. Therefore, This research propose the car-ferri network which is the most effective logistics system substitutes the land logistics system. This research will contribute improving the north and south logistics network of Pusan and Seoul region and will be able to reduce a various goods expense.

• Animal cells and systems
• /
• v.14 no.3
• /
• pp.207-212
• /
• 2010

The characteristics of insect communities in specific localities reflect climatic and environmental status and change. We investigated the description pattern of new insect species by reviewing announcements of new or newly recorded insects in Korea published in five systematic journals between 1999 and 2009: Entomological Research (1999-2009), Insect Koreana (1999-2003), Journal of Asia-Pacific Entomology (1999-2009), Korean Journal of Applied Entomology (1999-2009), and Korean Journal of Systematic Zoology (1999-2009). A total of 757 new species were reported in 299 research papers. More than 85% of the newly described or reported species belonged to four orders: Coleoptera (225 species), Lepidoptera (202 species), Hymenoptera (141 species), and Diptera (82 species). The number of new species fluctuated from year to year, and a few major authors described most species. The graph of the cumulative number of species described in Korea was not asymptotic. We also examined the decadal trends in the proportion of species according to their biogeographical origin. The numbers of northern (Palearctic and Nearctic) and southern (Oriental) species recorded in Korea between 1999 and 2009 were increasing mainly due to the recent taxonomic research environment. It is also possible that recent climatic change induces new migrants toKorea from more southern parts of Oriental region, but more information is needed to confirm this hypothesis.

• Journal of Species Research
• /
• v.8 no.3
• /
• pp.288-293
• /
• 2019

Herein, we report a new record of Arna bipunctapex (Hampson) and a new species, Euproctis fulvatus sp. nov. in Korea; both are Lymantriine moths. Arna bipunctapex is distinguished by a relatively large wingspan with two black dots and a small dot between these black dots in the apical region of a yellowish forewing. The male genitalia of A. bipunctapex can be distinguished by the lack of a process on the sacculus of valva while the female genitalia can be distinguished by an antrum that is basally flat with two lateral digitate arms. Euproctis fulvatus is distinguished by yellowish wings with a medially curved central fascia of the forewing. The male genitalia can be distinguished by the bifid, digitate uncus and the simple, square-shaped valva with a distal strong invaginated margin. The female genitalia can be distinguished by the long, medially twisted, ductus dursae with simple antrum posteriorly strongly sclerotized and ovate corpus bursae without signum. Larvae of E. fulvatus are distinguished by a black head with a pair of long, black, lateral tufts, dorsum with 10-11 white intersegmental dots and bright red setal warts on T2-A8, and bright red glands on A6 and A7.

• The Korean Journal of Health Service Management
• /
• v.12 no.3
• /
• pp.79-93
• /
• 2018

Objectives: This study aimed to identify the current status and factors associated with emotional support services among care providers in elderly care service organizations. Methods: A total of 87 elderly care service agencies nationwide were recruited for the survey. Agencies' characteristics and emotional capacity monitoring activities; and program-building operations among care providers were measured. The collected data were analyzed using an ANOVA and multiple regression analysis. Results: Emotional capacity monitoring activities and program building were generally low. Factors associated with emotional capacity monitoring activities were region, welfare regulations, and vacation and annual leave provisions, while those associated with emotional capacity building programs were identified as vacation and annual leave provisions. Conclusions: The agencies' vacation and welfare system seems to affect emotional support service activities among care providers. It is necessary to prevent emotional exhaustion of care providers and promote quality improvement of care through social and systematic emotional support services.

• Journal of Environmental Science International
• /
• v.31 no.5
• /
• pp.431-445
• /
• 2022

The Gwangju Stream is a major tributary of the Yeongsan River. To maintain environmental and ecological functions in the stream, the flow is secured by natural water from the Mudeung Mountain as well as waters discharged from Lake Juam and the Gwangju sewage treatment plants. A substantial amount of water is supplied into the upper reaches of Gwangju Stream from Lake Juam. To examine the ecological effects of the water input from Lake Juam on the Gwangju Stream, a field survey of phytoplankton community species and an evaluation of water properties was conducted at five stations, from station GJ1 before the inflow to station GJ5 in the lower region. Nutrient levels decreased in the vicinity of the Lake Juam inflow, suggesting that this water inflow can contribute to the reduction of eutrophication in the stream. The phytoplankton community was mainly composed of Bacillariophyceae, Chlorophyceae, and Cyanophyceae, and the community structure was similar to that of the other study sites located near the water inflow regions. The inflow of water from Lake Juam can affect water quality and the phytoplankton community over a limited area, reducing eutrophication and increasing water flow in the Gwangju Stream.

• Korean Journal of Environmental Biology
• /
• v.40 no.1
• /
• pp.87-98
• /
• 2022

In this study, the community structure of marine benthic invertebrates was examined to evaluate the differences between the west, south, and east coasts of Korea and to identify the indicator species representing each region. Acrylic attachment plate sets were installed in Jeongok, Mokpo, Tongyeong, Yangpo, and Gangreung, and the invertebrate fauna thus captured were identified. Monitoring was performed in each area from March 2017 to May 2018. Water depth, temperature, and salinity at each location were measured to determine the potential influence of abiotic factors on the community structure. As a result, the mean depth of plates installed and the water temperature were significantly different in each area. A total of 32 invertebrate species were identified in all localities, and the most significant difference in the species compositions was found between Mokpo and Gangreung. The community structure differed significantly with a change in the plate depth, and a larger number of indicator species appeared on shallower plates. Finally, we determined the community structure of benthic invertebrates in different geographical regions of the Korean ocean by characterizing the dominant invertebrate taxa and the indicator species at each site.

• New & Renewable Energy
• /
• v.20 no.2
• /
• pp.35-43
• /
• 2024

A pump turbine is a technically matured option for energy production and storage systems. At the off-design operating range, the pump turbine succumbed to flow instabilities, which correlated with the pump turbine geometry. A low specific speed pump turbine was designed and modified according to the impeller blade angle. Reynolds-Average Navier-Stokes is carried out with a shear stress transport turbulence model to evaluate the detailed flow characteristics in the pump turbine. The impeller blade inlet angle (𝛽₁) and outlet angle (𝛽₂) are used to evaluate hydraulic loss in the pump turbine. When 𝛽₁ changed from low to high value, the maximum efficiency is increased by 4.75% in turbine mode. The S-Curve inclination is reduced by 8% and 42% for changes in 𝛽₁ and 𝛽₂ from low to high values, respectively. At α = 21°, the shock loss coefficient (𝜁_s) is reduced by 16% and 19% with increases of 𝛽₁ and 𝛽₂ from low to high values, respectively. When 𝛽₁ and 𝛽₂ values increased from low to high, the impeller friction coefficient (𝜁_f) increased and decreased by 20% and 8%, respectively. Hence, the high 𝛽₂ effectively reduced the loss coefficient and S-Curve inclination.

• Journal of Fashion Business
• /
• v.28 no.2
• /
• pp.15-32
• /
• 2024

This study aimed to investigate the perceptions and preferences of foreigners residing in Korea towards K-fashion. It sought to provide suggestions for the future development of K-fashion targeting this growing demographic. The results revealed that the longer foreigners had lived in Korea, the more positively they rated Korean fashion, shopping, and culture. The majority of foreigners purchased K-fashion items online, with popular choices including T-shirts, jackets, shirts, and jeans. Both men and women identified shoulders as a common problematic area when wearing clothing, with some issues also reported in the lumbar region. In terms of preferences, younger males (teens and twenties) were more inclined towards fads and celebrity wear compared to older males (thirties and forties). Similarly, younger females (teens and twenties) showed a higher preference for functionality and celebrity wear compared to older females (thirties and forties). These findings suggest that men tend to prioritize aesthetic factors when choosing K-fashion, while women prioritize practical considerations. To better cater to foreign consumers, suggestions for the development of K-fashion include promoting it through K-pop stars, considering dimensions related to foreigners' shoulders when designing top items, diversifying colors, sizes, and patterns, and providing English versions of online shopping platforms.

• Horticultural Science & Technology
• /
• v.19 no.4
• /
• pp.471-475
• /
• 2001

This experiment was conducted to evaluate the effect of slow-release fertilizer on warm type garlic cultivation in the Southwestern region of Korea. The slow-release fertilizers used were UF(Urea-Formaldehydes)70, 100, 130, CDU(Crotonylidene Diurea)100, and IBDU(Isobuty- lidene Diurea)100. The slow-release fertilizer treatment slightly increased plant height, leaf sheath diameter, and leaf number compare with conventional fertilizer treatment. Also, large bulb rate, nitrogen and pyruvic acid contents of garlic in slow-release fertilizer plot were higher than other treatments. Application of slow-release fertilizer increased the commercial yields.