• Journal of Korean Ophthalmic Optics Society
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• v.15 no.2
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• pp.175-183
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• 2010

Purpose: This study investigated the impact of ametropia and myopia on health-related quality of life (QoL) measures in elementary schoolers. Methods: Elementary school children of 92 aged 12 to 13 were divided into emmetropia and myopia groups by spherical equivalent. Then myopia was classified into the low, moderate and high myopia groups. Vision-related QoL scores were determined using PedsQL 4.0 (Pediatric Quality of Life Inventory) with physical health (8 items), emotional functioning (4 items), social functioning (5 items) and school functioning (5 items). Results: The total QoL score in the myopia group appeared lower than that in the emmetropia group, however the difference was not statistically significant (p>0.05). When it comes to physical health (running or exercising) and social functioning (getting along with friends or being teased)-related questions, the QoL score in myopia was low compared with the emmetropia group (p<0.05). High myopia showed a low score in physical health items but there was no significant difference in overall QoL scores in comparison with other groups (p<0.05). Conclusions: Refractive errors does not have a great impact on the total health-related QoL in elementary school children but it causes discomfort in physical health and social functioning.

• Journal of the Korean Society for Nondestructive Testing
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• v.28 no.2
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• pp.191-198
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• 2008

Flow accelerated corrosion (FAC) phenomenon of low alloy carbon steels in nuclear power plant has been known as one of major degradation mechanisms. It has a potential to cause nuclear pipe rupture accident which may directly impact on the plant reliability and safety. Recently, the equipotential switching direct current potential drop (ES-DCPD) method has been developed, by the present authors, as a method to monitor wall loss in a piping. This method can rapidly monitor the thinning of piping, utilizing either the wide range monitoring (WiRM) or the narrow range monitoring (NaRM) technique. WiRM is a method to monitor wide range of straight piping, whereas NaRM focuses significantly on a narrow range such as an elbow. WiRM and NaRM can improve the reliability of the current FAC screening method that is based on computer modeling on fluid flow conditions. In this paper, the measurements by ES-DCPD are performed with signal sensitivity analyses in the laboratory environment for extended period and showed the viability of ES-DCPD for real plant applications.

• Korean Journal of Ecology and Environment
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• v.38 no.3 s.113
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• pp.352-360
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• 2005

Acheilognathus signifer is distributed widely in high density in the Naechon-stream. The order of this-stream was 2 ${\sim}$ 4 and the water width is wide but the depth is relatively shallow and the sinuosity is 1.83, which indicates a meandering stream. The water width/stream width ratio is 1.59, which suggests moderate entrenchment. Naechon-stream was classed as B type by Rosgen (1995). The natural habitat of A. signifer is a slow flow velocity pool, like a backwater pool, which is made up of piled up boulders that restricts the flow of water. The stream bed is made up of boulders and sands that enable the spawning host to inhabit. A. signifer selects a microhabitat where the boulders furnish hiding places. The Habitat of A. signifer is strongly affected by the existence or not there of U. douglasiae sinuolatus. After hatching from the mussel, A. signifer inhabits the surface of the water. It then moves to the low layer once it acquires swimming ability. While A. signifer inhabits the river in summer, A. signifer moves to the deeper layers in winter, where there are the refuge like rocks and boulders. In spring A. signifer moves from the deep water to the river line where the mussels reside.

• Korean Journal of Ecology and Environment
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• v.36 no.1 s.102
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• pp.66-73
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• 2003

Field experimental study was performed to evaluate water and nutrient balances in paddy rice culture. The water balance showed that outflow generally balanced the inflow showing that about half (47${\sim}$54%) of total outflow was lost by surface drainage. No significant effect of fertilization rate was observed from three treatments (150%, 100%, and 70% of standard fertilization) on both rice yield and nutrient outflow from surface drainage. Therefore, reducing nonpoint source nutrient loading by reducing fertilization may not work well in the range of normal paddy rice farming practice, and instead it could be achieved by reducing surface drainage outflow. Water-saving irrigation by reducing pending depth, raising ridge height in rice field, and minimizing forced surface drainage are suggested to reduce surface drainage outflow. These practices can save water and protect water quality, however, deviation from conventional standard practices might affect the rice yield and further investigations are necessary. It was demonstrated that rainfall affects nutrient net outflow and paddy rice culture might be beneficial to wafer quality protection under normal rainfall condition.

• Journal of Life Science
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• v.25 no.11
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• pp.1204-1213
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• 2015

A comprehensive analysis of the population structure of the sandfish (Arctoscopus japonicas), the most abundant fishery resource in the East Sea of Korea, has not been carried out, despite its importance in Korea. The present study examined the genetic diversity and differences between five populations (two Japanese and three Korean populations) of A. japonicas captured in the East Sea using both the 401 bp sequence of mitochondrial DNA (mtDNA, cytochrome b) and five microsatellite DNA (msDNA) markers. The results of the analysis using the Cyt b sequence revealed 27 haplotypes. Based on msDNA variations, the estimated expected heterozygosity (H_E) in each population ranged from 0.68 (Gampo, Korea) to 0.7765 (Erimo, Japan). Pairwise F_ST and AMOVA tests using both the Cyt b sequence and msDNA data pointed to significant differences between the Korean and Japanese populations (mtDNA; F_ST=0.2648, p<0.05, msDNA; F_ST=0.0814, p<0.05). These results were similar to the results of UPGMA, PCA, and structure analysis. In these analyses, the five populations were assigned to two groups (Korean populations and Japanese populations). These results shed light on the genetic diversity and relationships of A. japonicas and contribute to research on the evaluation, conservation, and utilization of Korean A. japonicas as genetic resources.

• Korean Journal of Food Science and Technology
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• v.25 no.1
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• pp.39-45
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• 1993

The effects of enzymatic modification with pepsin and actinidin was studied on molecular weight distributions and functional properties of hydrolysates from soy protein isolate (SPI) differing in degree of hydrolysis. The hydrolyzed SPI by pepsin showed 41.5% degree of hydrolysis after 5 min, and maximum hydrolysis was obtained after 2 hours. Actinidin hydrolyzed SPI 26.71% degree after 1 hour. On SDS-PAGE, native SPI showed 9 distinguishable bands on SDS-PAGE gel. Pepsin treated SPI showed one broad band in the lower part of gel. This band was shifted further to the bottom of the gel and became faint as hydrolysis time increased. While actinidin treated SPI showed different SDS-PAGE pattern from pepsin. However PAGE patterns were similar with pepsin and actinidin treated groups. With pepsin treatment, solubility of SPI distinctively increased around isoelectric point(pI). Emulsifying activity (EA) and emulsifying stability (ES) showed marked increase over pH range of $3.0{\sim}8.0$. 5 min modified group had most excellent foam expansion (FE). Foam stability (FS) was increased as pepsin treatment time increased at pI. With actinidin treatment, solubility was increased. 60 min modified SPI had the most effective EA at pH 4.5. However ES was not effected by actinidin treatment. 5 min modified group was most effect in FE. FS was higher at alkaline pH.

• Korean journal of applied entomology
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• v.19 no.4 s.45
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• pp.203-211
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• 1980

The pattern of blast disease incidence of Tonsil-line rice varieties derived from the cross between Indica and Japonica type was quite different from that of Japonica-type rice varieties. The former showed discontinuity between the incidence of leaf blast and panicle blast; the incidence .of leaf blast was slight, while that of panicle blast was very severe. Different level of nitrogen fertilizer applied influenced significantly the incidence of leaf blast but influenced slightly the incidence of panicle blast of Tongil-line rice varieties. The infection percentage of panicle blast of Tongil-line rice varieties was about $90\%$ and most of them were infected in leaf sheaths during booting stage, but infection of panicle blast of Japonica-type rice varieties in leaf sheaths during booting stage was very low, only about $3\%$. Infection route of panicle blast in leaf sheaths during booting stage, microflora in leaf sheaths, and specific susceptibility of young panicle to blast disease were investigated in the epidemiological point of view.

• Proceedings of the Korean Society for Environmental Edudation Conference
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• 2002.01b
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• pp.1-168
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• 2002

이 연구는 지난 20여 년 동안 우리나라 환경교육의 활성화를 위하여 많은 연구자, 학교 교사, 환경단체 지도자가 제안해 온 과업을 다루고있다. 그것은 학교 안팎에 걸쳐 요람에서 무덤까지 환경교육이 체계적이고 지속적으로 이루어질 수 있도록 법적, 제도적 기반을 마련하는 것이다. 법제적 뒷받침이 환경교육의 활성화를 위한 충분조건은 되지 못하더라도 필요조건으로서 매우 중요한 의미를 갖고 있다는 점은 분명하다. 이 연구를 수행한 사단법인 한국환경교육학회는 국회환경포럼과 함께 환경교육진흥법(가칭) 시안의 개발과, 나아가 실질적인 입법화를 위해 노력하였다. 이를 위하여 먼저 우리나라에 이미 존재하는 도서벽지 교육진흥법, 특수교육진흥법, 산업교육진흥법, 영재교육진흥법, 과학교육진흥법, 유아교육진흥법, 이상 여섯 개의 교육진흥법을 분석하여 환경교육진흥법 시안 개발을 위한 시사점을 얻고자 하였다. 다음으로 외국의 환경교육 관련법에 대한 사례 연구를 진행하였다. 특히 미국의 경우 1970년 처음 환경교육법이 제정된 이후 몇 차례의 개정과 재승인 과정을 거쳐왔다. 미국에서는 1990년에 제정된 국가환경교육법의 재승인에 관한 공청회가 지난 2000년 여름 동안 개최되어 환경교육법의 필요성, 효과, 고려할 조항 등 본 연구에 중요한 참고 자료를 얻을 수 있었다. 본 학회의 다른 연구진에 의해 2001년 10월에 완료된 제2차 환경교육 중 ·장기 강화방안 연구의 결과물도 환경교육 활성화를 위한 시안에 담아야 할 내용과 방향을 결정하는데 실질적인 도움을 주었으며, 이를 토대로 연구진과 국회환경포럼의 환경교육활성화위원회의 위원이 윤독과 수정을 거쳐 시안의 타당성과 완성도를 높이고자 하였다. 작성된 시안에 대해서는 먼저 국내의 환경 또는 환경교육 관련 전문가에게 설문지를 보내어 의견 수렴을 하였으며, 이 과정에서 시안에 포함된 대부분의 항목에 대해 높은 찬성률을 보인 것으로 나타났다. 그밖에 설문지로부터 수정 ·보완 요청 사항을 정리하여 최종 시안을 작성하는데 반영하였다. 끝으로 10월 26일 국회 의원회관에서 개최된 공청회를 통하여 다양한 집단의 의견을 수렴하였으며, 공청회 동안 제시된 의견들을 반영하여 최종 시안을 작성하였다. 이러한 과정을 거쳐 작성된 환경교육진흥법 최종 시안은, 제1조 목적에서 제11조 환경교육연구의 진흥에 이르기까지 총11조로 구성되었으며, 환경교육사 자격증제 및 환경교육 프로그램 인증제 등 획기적인 전기를 마련할 수 있는 방안들이 다수 포함되어 있다. 특히 환경교육진흥법의 주무 부처를 환경부로 제안한 것은 기존의 교육 관련 진흥법들이 교육인적자원부를 주무로 하고 있는 것에 비해 매우 특기할 만 하다. 그 이유는 본문에서 밝힌 바와 같이 환경교육이 갖고 있는 특수성 때문이다. 환경교육진흥법의 주무 부처를 환경부와 교육인적자원부 중 어디로 하는 것이 바람직한가에 대해서는 연구진 내부는 물론 공청회에 참가한 사람들 사이에도 이견이 있었음을 밝혀 둔다. 끝으로, 이 연구에서 마련된 시안과 연구 결과가 최종적으로 속히 법제화가 되고, 우리나라 환경교육 진흥에 기여하게 되기를 바란다.

• Journal of Aquaculture
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• v.10 no.3
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• pp.311-320
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• 1997

The experiment was conducted t determine the effects of water temperature and daily feeding rate on Koran rockfish growth. The first experiment was carried out to know the growth of the fish in the different water temperature. The second experiment was carried out to know the effects of feeding rate of the fish. In the first experiment, feed efficiency was unaffected by the different water temprature 12, 15 and $18^{\circ}C$, but feed intake and growth rate were affected by the water temperature. Feed intake and growth rate of the fish reared in $15^{\circ}C$ were higher than those of the other groups. In the second experiment, feed efficiency was unaffected by feeding rate except the starve group. Daily growth rate of the fish fed 1.0% diet/BW or more. HSI, VSI, condition factor, GOT, GPT, TG, GL and Ht of fed groups were unaffected by the feeding rate in the experiment. Absoption ratios of protein and lipid were not different with the different feeding rates in fed fish groups. These results indicate that the optimum daily feeding rate of yearling Korean rockfish is about 70-80% of satiation rate.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.9
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• pp.643-651
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• 2020

A capsule train runs inside a sub-vacuum tube and can reach very high speed due to the low air resistance. A capsule train uses a superconducting electrodynamic suspension (SC-EDS) method for levitation, which allows for a large levitation gap and does not require gap control. However, SC-EDS has inherent characteristics such as the large gap variation and a small damping effect in the levitation force, which can degrade the running stability and ride comfort. To overcome this, a stability improvement device should be designed and applied based on dynamic analysis. In this study, a 1/10 small-scale testbed was developed to replicate the dynamic characteristics of a capsule train and investigate the performance of stability improvement devices. The testbed is composed of a 6-degree-of-freedom Stewart platform for the realization of bogie motion, a secondary suspension with a running stabilization device, and a carbody. Based on the dynamic similarity law proposed by Jaschinski, the small-scale testbed was manufactured, and a bogie motion algorithm was applied with the consideration of guideway irregularity and levitation stiffness. The experimental results from the testbed were compared with simulation results to investigate the performance of the testbed.