• Environmental Analysis Health and Toxicology
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• v.24 no.1
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• pp.25-32
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• 2009

Toxicity of ocean dumping wastes(dye waste, urban sewage, food waste) were examined by observing fertilization and embryo development rates of the Sea Urchin, Strongylocentrotus nudus. Spawning was induced by injecting 1 mL of 0.5 M KCl into coelomic cavity. Males released white or cream-colored sperms and females released yellow or orange-colored eggs. Experiments were began within 30 min after the collection of both gametes. The fertilization and embryo development rates tests were performed for 10 min and 48 h after fertilization, respectively. The fertilization and embryo development rates in the control condition(not including ocean dumping wastes sludge elutriate) were greater than 90%, but markedly decreased with increasing concentrations of ocean dumping waste sludge elutriate. The fertilization and normal embryogenesis rates were significantly inhibited in all waste sludge elutriate from dye waste($EC_{50}$=5.76; $EC_{50}$=4.53), urban sewage($EC_{50}$=9.82; $EC_{50}$=9.67) and food waste($EC_{50}$=3.90; $EC_{50}$=3.27), respectively. The NOEC(>3.13%) and LOEC(3.13%) of fertiliztion and normal embryogenesis rates very similar in all waste sludge elutriate. These results suggest biological assay using the fertilization and embryo development rates of S. nudus are very useful test method for the ecological toxicity assessment of ocean dumping wastes.

• Journal of Korea Game Society
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• v.16 no.4
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• pp.87-96
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• 2016

This study was carried out to investigate the effects of contents for the serious game development of the customized diet education in Type II Diabetes. Because the development of the existing serious game focuses on Type I Diabetes, this study was designed to carry out customized education through the interaction between Type II Diabetes and health manager. The period of data collection was from July 11 to December 26 in Y2015, the subjects were selected from a total of 26 people suitable for Type II diabetes who visited the public health center to apply for a diabetic diet education and completed the 8 continued education. After receiving customized diet prototype education, the self-care behaviors and HbA1C of the subjects were statistically significantly increased(p<.05)

• Journal of Korea Game Society
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• v.15 no.4
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• pp.19-28
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• 2015

According to the Infant Educational Law, learning of the children are encouraged through playing, but there are not many tools to learn. Educational Serious Game is a game developed for the purpose of learning. And so, in this paper, we produced serious games for education learning for young children. Contents of the game is the digestive system. And we utilized touch and drag which are kinds of intuitive interface of the mobile platform being able to play easy. At the end of each stage, and it contained a scene that can learn the characteristics of the digestive system. After producing this game, we supplemented something that is inadequate through testing. In addition, the learning effect of the game was confirmed by interviews with the teachers. We hope this will be a fun and informative game for the digestive tract to the children.

• Journal of Korea Game Society
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• v.13 no.6
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• pp.95-110
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• 2013

Current up-to-date courses of study put emphasis on raising creative students. However, the cramming methods of teaching mathematics in the school seems far from the creativity and the number of students who feels mathematics difficult is increasing. To overcome this situation, the government proposed 'the mathematics education using storytelling', which leads to lots of developments of mathematics using serious game in many areas. However most of the current serious games couldn't do away with the deductive framework of mathematics, which makes it impossible to achieve the purpose of raising creative students. This is because existing mathematics serious games have not deeply contemplated many aspects such as the purpose and theories of teaching and teaching mathematics. Therefore, in order to overcome the limitations of cramming methods in existing mathematics educations, this research proposes the new method of developing serious game contents for elementary geometry that is useful to improve mathematical intuition, based on RME, the theory of teaching/learning mathematics.

• Journal of Korea Game Society
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• v.15 no.3
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• pp.7-18
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• 2015

This research examined the effects of user experience in driving simulation game between using general monitor and 3D virtual reality device, Oculus Rift DK2. We compared the difference of user experience such as presence, flow and arousal by gaming environment. We also tested the effects of virtual reality on driving attitude, emotional pleasure and satisfaction. 100 beginner drivers with a driver's license participated in the experiment of two modes of gaming environment. As a result, all the three user experiences were proved to be significantly higher in VR game play than general monitor game. Also driving attitude, emotional pleasure and satisfaction showed a significant difference in virtual reality. This study makes a theoretical and practical contribution to the application of the next virtual reality game with a special function.

• Environmental Analysis Health and Toxicology
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• v.22 no.3
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• pp.211-218
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• 2007

Even though some standard developmental bioassay protocols for environmental assessment using sea urchins have already been described, there have not been many attempts to apply and modify these protocols with Korean species. Therefore, there is a strong need to establish standard bioassay protocols using sea urchins commonly found in Korea. Prior to developing a new protocol, it is essential to know the optimal conditions for the bioassay procedures. We investigated the optimal conditions (temperature, salinity, and embryo density) of the sea urchin Strongylocentrotus intermedius. The ideal temperature for developmental bioassay of S. intermedius was determined to be $15^{\circ}C$ and the time required for the embryo to become pluteus larva was 72 hr. The optimal range of salinity for the embryo toxicity using S. intermedius was between 30 to 32 psu, which is similar to the range found in the natural habitats of adult populations. The optimum density of embryos at the beginning of bioassays was 100 embryos/mL. When the assays were carried out at higher densities, the proportion of normally developed larvae decreased significantly.

• Korean Journal of Materials Research
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• v.27 no.12
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• pp.658-663
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• 2017

Urchin-structured zinc oxide(ZnO) nanorod(NR) gas sensors were successfully demonstrated on a polyimide(PI) substrate, using single wall carbon nanotubes(SWCNTs) as the electrode. The ZnO NRs were grown with ZnO shells arranged at regular intervals to form a network structure with maximized surface area. The high surface area and numerous junctions of the NR network structure was the key to excellent gas sensing performance. Moreover, the SWCNTs formed a junction barrier with the ZnO which further improved sensor characteristics. The fabricated urchin-structured ZnO NR gas sensors exhibited superior performance upon $NO_2$ exposure with a stable response of 110, fast rise and decay times of 38 and 24 sec, respectively. Comparative analyses revealed that the high performance of the sensors was due to a combination of high surface area, numerous active junction points, and the use of the SWCNTs electrode. Furthermore, the urchin-structured ZnO NR gas sensors showed sustainable mechanical stability. Although degradation of the devices progressed during repeated flexibility tests, the sensors were still operational even after 10000 cycles of a bending test with a radius of curvature of 5 mm.

• Animal Systematics, Evolution and Diversity
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• no.nspc5
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• pp.47-60
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• 2005

The joint faunal survey of Jindo Island, Korea was performed by the Korean Society of Systematic Zoology during June 29-July 1, 2004 in commemoration of the 20th anniversary. In this study, 20 echinoderm species of 13 families, ten orders in four classes such as one crinoid species, seven asteroid species of four families in three orders, five ophiuroid species of three families in two orders, four echinoid species of two families in one order, and three holothuroid species of three families in three orders collected from six localities (Bealpo, Chopyung, Supum, Hoedong, Seomang, and $34^{\circ}11'N\;and\;126^{\circ}21'E)$ were identified. Of these, one crinoid (Antedon serrata), two asteroids (Solaster dawsoni and Distolasterias nipon) and one pohiudoid (Astrodendrum sagaminum) are newly added to the echinoderm fauna of Jindo Island and one holothudoid (Pseudocnus sp.) is newly recorded in Korean waters. The total 31 species are presently listed with some brief remarks and their distribution patterns are discussed based on the composition of geographical distribution forms.

• Journal of the Korean Society for Computer Game
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• v.31 no.4
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• pp.1-8
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• 2018

The present study investigated the validity of a serious game named 'Draw Ttoring' developed for accessment of children's attention and tried to provide the basic information about it. To this goal, we tested it to 284 elementary school students in measuring various behavior data(reaction time, total playing time, correct rate, discrepancy between type of TMT). Futhermore, the behavior data was compared with academic achievement to see the external validity. In results, 'Draw Ttoring' showed various behavior data and correlation with academic achievement. In Type A of TMT, total time and reaction time had a correlation with academic achievement, while, in Type B of TMT, total time and correct rate did. Mental flexibility calculated by the discrepancy between Type A and Type B showed also the positive correlation with academic achievement. These results showed that the serious game named 'Draw Ttoring' can provide more various information about children attention and these can't be observed by traditional paper pencil test. Finally, serious game can provide an good alternative method to access children's cognition.

• Journal of Korea Game Society
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• v.19 no.1
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• pp.25-36
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• 2019

Outdoor play for young children can promote the development of physical development, emotional development, and creativity development. However, due to safety accidents that occur in outdoor play, outdoor play is not progressed sufficiently. In this paper, we have developed smart functional educational games for AR education which can be easily used in early childhood education. In order to maximize the educational effect of the developed game and to provide customized education on the field, we conducted a focus group interview with a group of in - service child care teachers in the game design stage. Through this, we developed a functional game with AR system and verified the educational effect.