• The Korean Journal of Zoology
• /
• v.36 no.3
• /
• pp.380-390
• /
• 1993

The freshwater cladocerans collected from the riverside of Han-gang and from the ricefields at Kojedo were identified as Leydigia leydigi (Schoedler, 1863) and L. ciliata Gauthier, 1939. These two species are redescrihed with illustrations. This is the first report of the chydorid species belonging to the genus Leydigia from Korea.

• International Journal of Fluid Machinery and Systems
• /
• v.4 no.2
• /
• pp.243-254
• /
• 2011

In the present paper, we focus on the flow computation of a low head Propeller turbine at a wide range of design and off-design operating conditions. First, we will present the results on the efficiency hill chart prediction of the Propeller turbine and discuss the consequences of using non-homologous blade geometries for the CFD simulation. The flow characteristics of the entire turbine will be also investigated and compared with experimental data at different measurement planes. Two operating conditions are selected, the first one at the best efficiency point and the second one at part load condition. At the same time, for the same selected operating points, the numerical results for the entire turbine simulation will be compared with flow simulation with our standard stage calculation approach which includes only guide vane, runner and draft tube geometries.

• Journal of Ginseng Research
• /
• v.27 no.4
• /
• pp.178-182
• /
• 2003

Vesicular-arbuscular mycorrhizae (VAM) fungi naturally colonise American ginseng roots and this relationship is highly beneficial to enhance plant productivity. Our goal was to determine the effect of adding two Glomus species (Glomus etuticatum, G. intraradices) on survival, photosynthetic capacity, growth, morphology and root ginsenoside content of one-year-old American ginseng plants grown in a broadleaf forest. While our study revealed that VAM inoculations significantly affected root morphology and Re ginsenoside content, the survival, photosynthetic capacity and root growth of American ginseng plants were not significantly influenced by VAM inoculations. Surface area and volume of rootlets were 16-25% higher for ginseng grown in VAM-inoculated soil compared to those grown in the control plots. Also, Re ginsenoside content was 18 ％ higher in YAM-inoculated roots compared to controls.

• Proceedings of the Korean Powder Metallurgy Institute Conference
• /
• 2006.09a
• /
• pp.91-92
• /
• 2006

Metallic foams have a combination of attractive properties such as high specific mechanical properties and good energy absorption characteristics. This paper presents the properties of steel foam sandwiches produced using powder metallurgy approach. Metallic powder, solid polymeric binder and a foaming agent are dry-mixed and molded into the desired shape. The molded powder mix is then heat-treated to foam, debind and sinter the material. The resulting material has an open cell structure with high porosity. The structure and properties of sandwiches specimens produced with the process are presented and discussed.

• Journal of Korean Philosophical Society
• /
• v.143
• /
• pp.165-188
• /
• 2017

According to Braybrooke(1976) and Sobel(1976), the traditional problem of the social contract is insoluble as long as it assume the 'agents with the rational egoistic motivations' in the 'circumstances such as the state of nature'. The problem of social contract is so called because it defies solution and it runs in the family of social contract theory. Then, do contemporary social contract theories have a solution? I argue that contemporary social contractarians fail to supply a solution due to a previous question or a circulation problem in their theories. And then, I show how conventionalism helps social contractarianism escape the problem.

• The Journal of the Korea Contents Association
• /
• v.8 no.7
• /
• pp.216-223
• /
• 2008

The purpose of this study was to examine the effects of the satisfaction and absorption of spectating on desire of re-spectating at the professional sporting events. This study set a model of consumer behavior decision based on the results of the precedent studies about the determinative factors of consumer behavior and the hypothetical model done by Wakefield ＆ Sloan(1995), Hansen ＆ Gauthier(1989), Jeffrey(1997), Green(1995), and Kim(1999) and clarified it through the regression. To attain the goal of the study described above paragraphs, some viewers of 2007 season pro-soccer and pro-baseball games were set as a collected group. Then, using the stratified cluster random sampling method, finally drew out and analyzed 605 spectators in total. Data collected through a questionnaire designed for this study consist of fixed alternative choice response to items constructed to represent the operational definition for each variable. Statistics employed for data analysis was correlation and multiple regression. Based upon the results of the study, the following conclusions appear warranted: 1. Satisfaction of spectating influence on desire of re-spectating at the professional sporting events. 2. Satisfaction of absorption influence on desire of re-spectating at the professional sporting events.

• The Journal of the Korea Contents Association
• /
• v.12 no.1
• /
• pp.508-515
• /
• 2012

The purpose of this study was to examine if factors of baseball stadium environment which people have spectating satisfaction of professional baseball. The respondents of the study 614 who were spectators at D city professional baseball event. The stratified cluster random sampling method has been used in this study. The material collection device was the brochure named [A Influence of Factors of Baseball Stadium Environment on Spectating Satisfaction of Professional Baseball]. The result of reliability check up was here below; stadium factors ${\alpha}$=.966~.890, spectating costs ${\alpha}$=.922~.988, spectating promotion ${\alpha}$=.894~.789. To analyze materials, the "correlation analysis" and "regression analysis" were used as statistic analysis techniques. The conclusion based on above study method and the result of material analysis are here below. 1. The stadium factors influence spectating satisfaction of professional baseball. 2. The spectating cost factors influence spectating satisfaction of professional baseball. 3. The spectating promotion factors influence spectating satisfaction of professional baseball.

• Nuclear Engineering and Technology
• /
• v.39 no.1
• /
• pp.31-42
• /
• 2007

Energy supply is increasingly showing up as a major issue for electricity supply, transportation, settlement, and process heat industrial supply including hydrogen production. Nuclear power is part of the solution. For electricity supply, as exemplified in Finland and France, the EPR brings an immediate answer; HTR could bring another solution in some specific cases. For other supply, mostly heat, the HTR brings a solution inaccessible to conventional nuclear power plants for very high or even high temperature. As fossil fuels costs increase and efforts to avoid generation of Greenhouse gases are implemented, a market for nuclear generated process heat will be developed. Following active developments in the 80's, HTR have been put on the back burner up to 5 years ago. Light water reactors are widely dominating the nuclear production field today. However, interest in the HTR technology was renewed in the past few years. Several commercial projects are actively promoted, most of them aiming at electricity production. ANTARES is today AREVA's response to the cogeneration market. It distinguishes itself from other concepts with its indirect cycle design powering a combined cycle power plant. Several reasons support this design choice, one of the most important of which is the design flexibility to adapt readily to combined heat and power applications. From the start, AREVA made the choice of such flexibility with the belief that the HTR market is not so much in competition with LWR in the sole electricity market but in the specific added value market of cogeneration and process heat. In view of the volatility of the costs of fossil fuels, AREVA's choice brings to the large industrial heat applications the fuel cost predictability of nuclear fuel with the efficiency of a high temperature heat source tree of Greenhouse gases emissions. The ANTARES module produces 600 MWth which can be split into the required process heat, the remaining power drives an adapted prorated electric plant. Depending on the process heat temperature and power needs, up to 80% of the nuclear heat is converted into useful power. An important feature of the design is the standardization of the heat source, as independent as possible of the process heat application. This should expedite licensing. The essential conditions for success include: ${\bullet}$ Timely adapted licensing process and regulations, codes and standards for such application and design ${\bullet}$ An industry oriented R&D program to meet the technological challenges making the best use of the international collaboration. Gen IV could be the vector ${\bullet}$ Identification of an end user(or a consortium of) willing to fund a FOAK