• Economic and Environmental Geology
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• v.57 no.2
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• pp.143-159
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• 2024

Natural aggregate is an essential resource for human activities, closely related to construction. The aggregate demand has been increasing annually, and due to the nature of the resource, it is difficult to procure from distant locations. This study identifies the distribution and characteristics of aggregate-bearing areas as part of a municipal-level aggregate resource survey conducted in Nonsan City, Korea, in 2023. Nonsan City is located approximately 35 km straight distance from the Geum River estuary and lies at the passageway of the main stream of the Geum River. The topography of Nonsan City features eastern mountainous areas and western plains, creating an east-high-west-low geomorphic setting, with 33 streams distributed across the city, including tributaries of the Geum River like Nonsan Stream, Noseong Stream, and Ganggyeong Stream. All streams originate from the highlands in the north and east, converge with Nonsan Stream, and then join the west bank of the main stream of the Geum River at the western boundary of Nonsan City. Drilling core results show shallow depths in the highlands to the north and east, deepening towards the west, reaching a maximum depth of 25 m near the main stream of the Geum River. The total reserve of land aggregates is calculated to be 246,789,000 m³, with a developable amount of 172,750,000 m³. The total reserve of river aggregates is 5,236,000 m³, with a developable amount of 3,765,000 m³. The distribution of aggregates varies according to the geomorphic, geologic, and development pattern of the river system. Reserves are scarce in mountainous areas but are abundant in regions with rivers and wide alluvial plains, although reserves appear at depths greater than 4m. The distribution of aggregate resources in Nonsan City is influenced by stream activities and sea level changes, with the tidal range of the Yellow Sea acting as an unfavorable condition for the preservation of aggregate resources.

• Korean Journal of Environment and Ecology
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• v.36 no.6
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• pp.592-602
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• 2022

This study aimed to check habitat distribution and analyze influencing factors by analyzing the mating calls of Auritibicen intermedius inhabiting limited locations in South Korea by applying bioacoustic detection techniques. The study sites were 20 protection areas nationwide. The mating call analysis period was 4 years from 2017 to 2021, excluding 2020. The bioacoustic recording system installed at each study site collected recordings of mating calls every day for 1 minute per hour. Climate data received from the Meteorological Agency, such as temperature, humidity, rainfall, cloudiness, and sunshine, were analyzed. The results of this study identified A. intermedius habitat only in four national parks in the highlands of Gangwon Province (Mt. Seorak, Mt. Odae, Mt. Chiak, and Mt. Taebak) out of 20 study sites. During the four years of study, the mating call period of A. intermedius was between August 5 and September 28, and the duration of the mating call was 31 to 52 days. The temperature analysis during the appearance period of A. intermedius showed that A. intermedius mainly produced mating calls at temperatures between 13.1℃ and 35.3℃, and the average temperature during the circadian cycle of mating calls (09:00 to 16:00) was 24.4 to 24.9℃. The analysis of the circadian cycle of mating calls at four study sites where A. intermedius appeared in 2019 showed that A. intermedius produced mating calls from 06:00 to 16:00 and that they peaked around 11:00 to 12:00. During the appearance period of A. intermedius, four species appeared in common: Hyalessa maculaticollis, Meimuna opalifera, Graptopsaltria nigrofuscata, and Suisha coreana. A logistic regression analysis confirmed that sunlight was the environmental factor affecting the mating call of A. intermedius. Regarding interspecific influence, it was confirmed that A. intermedius exchanged interspecific influence with 4 other common species (H. maculaticollis, M. opalifera, G. nigrofuscata, and S. coreana). The above results confirmed that A. intermedius habitats were limited in the highlands of Gangwon Province highlands in Korea and produced mating calls at a lower temperature compared to other species. These results can be used as basic data for future research on A. intermedius in Korea.

• Korean Journal of Plant Taxonomy
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• v.42 no.3
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• pp.202-206
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• 2012

A new species, Viola ulleungdoensis M. Kim & J. Lee is named and described from Is. Ulleung, Gyeongsangbukdo Province, Korea. Molecular data confirmed that this new taxon was distinguished from other congeneric species. The Viola ulleungdoensis shares several characteristics (acaulescent leaves, beardless lateral petals, glabrous petioles and peduncles, etc.) with its related species V. selkirkii, but is distinct from V. selkirkii which has present adventitious buds, same leaves after flowering, small leaves, and high altitude habitats by having absent adventitious buds, larger leaves after flowering, large leaves, and low altitude habitats.

• Journal of Digital Convergence
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• v.12 no.1
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• pp.61-70
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• 2014

It has been raised a number of administrative ethic questions nevertheless of institutional strategy. It's even worse rather than solved. Especially, because of a distinctive family calture tradition that forming intimate bond, we're carrying lots of possibility of public corruption. As in the case of Busan Saving Bank recently, many of high-ranking officials are scouted to lawferm or business interest company After that this ex-officials exert their influence over government office. terminating public corruption. Lenient law enforcements as in the case of sponser prosecutor, social welfare budget embezzlement result in public distrust about anticorruption policy of government In conclutsion, for a best function of public service ethic system it's important to improve institutional problem constantly.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.26 no.4
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• pp.995-1012
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• 2016

In Internet of Things (IoT) environments, devices or sensors everywhere can automatically collect data without the individual awareness, further combine and share data using ubiquitous network, and thus the development of IoT raises new challenges in respect of personal data protection and privacy. This study aims to identify main issues related to data protection in the IoT and propose adequate measures. We analyzed the types of personal data controllers and processors in IoT and figured out the issues regarding the processing of personal data and the rights to privacy of data subject. Accordingly, we suggested the institutional ways (e.g., establishment of user-friendly notice and flexible consent system, re-identification risk monitoring system, data protection in cross-border transfer, and user education) to improve the situation of personal data protection in IoT and finally proposed the improvement tasks to carry out first based on the degree of urgency and importance.

• Journal of Nutrition and Health
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• v.37 no.9
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• pp.771-779
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• 2004

This study was performed to investigate the effect of dietary $\beta$-carotene supplementation on lipid metabolism and antioxidant enzyme activities in hyperlipidemic rats. Fifty Sprague-Dawley male rats aging 7 weeks were fed the control diet (CD,5% corn oil) and the high fat diet (HFD,15% beef tallow +1% cholesterol) for 4 weeks and then 0.02% $\beta$-carotene was supplemented to CD and HFD group for 8 more weeks. Serum lipid compositions, lipid peroxides and antioxidative enzymes in liver were analyzed at 4, 8 and 12week of the experiment. Serum levels of total lipid, total cholesterol, triglyceride, LDL-cholesterol, VLDL-cholesterol were higher in HFD groups than in CD groups (p < 0.001), Serum levels of HDL-cholesterol were higher in CD groups than in HFD groups (p < 0.01) . The effect of $\beta$-carotene supplementation was not significant in all groups but tended to be lower in total lipid, total cholesterol and Triglyceride. Thiobarbituric acid reactive substances (TBARS) levels in plasma and liver were showed significantly higher in HFD groups (p < 0.001, p < 0.05). The effects of $\beta$-carotene supplementation on the level of plasma and liver TBARS were not found except HFD groups at 12 week. Liver conjugated diene levels in HFD groups were higher than in CD groups (p < 0.01), but the effect of $\beta$-carotene supplementation did not show any differences. Liver lipofuscin levels were not significantly different among all groups. The activities of superoxide dismutase (SOD) and catalase were significantly lower in HFD groups at 8 week (p < 0.001) but were not significantly different at 4 and 12week. The activity of SOD in $\beta$-carotene supplemented HFD group was significantly higher at 8 week (p < 0.01). Glutathione peroxidase (GSH-Px) activity was significantly lower in HFD groups (p < 0.01) and was significantly increased in groups supplemented $\beta$-carotene (p < 0.05). It is suggested that $\beta$-carotene supplementation partly decreases the serum lipid and lipid peroxide levels and increases the activities of antioxidant enzymes in hyperlipidemic rats.

• Journal of Nutrition and Health
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• v.38 no.2
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• pp.89-95
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• 2005

This study was performed to investigate the effect of soy isoflavone on plasma nitrite concentration and the antioxidant enzyme activities of erythrocyte and the liver using adult male rats fed high fat diet. Seven-week old male Sprague Dawley rats were divided into three groups and fed high fat diet (15% beef tallow, 1 % cholesterol; control: IF0) or high fat diets containing isoflavone 80 ppm (IF80) or 320 ppm (IF320) for 10 weeks. Plasma nitrite concentration as a vasodilator, and antioxidant enzyme activities in erythrocytes and the liver were measured. Plasma nitrite concentration was increased by 45% and 35%, respectively, in IF80 and IF320 than in IF0 group. Erythrocyte catalase, glutathione peroxidase (GPx) and glutathione reductase (GR) activities increased by 31 %, 30% and 40% in IF320 compared to IF0 group. Especially, erythrocyte GR activity increased by 61 % in IF80 group. However, catalase activity in the liver was decreased in IF80 group. GPx and GR activities in the liver were not differ among groups. The results suggest that soy isoflavone have the protective effect against risk factors related with cardiovascular disease by improving vasodilator factor, nitrite, and antioxidant enzyme activities in blood. (Korean J Nutrition 38(2): 89～95, 2005)

• KDI Journal of Economic Policy
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• v.19 no.1
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• pp.151-194
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• 1997

본고는 다음과 같은 문제를 제기한다. 해외직접투자와 관련한 우려 중의 하나가 수출이 잘되고 있는 부문에서 해외투자가 증가하여 국내의 수출기반을 약화시킬 수 있다는 것인데, 이를 어떻게 해석할 수 있을 것인가? 이 문제에 대한 접근을 위해 본 논문에서는 우리나라 수출입(輸出入) 및 해외직접투자(海外直接投資)의 구조변화(構造變化)에 관한 분석을 시도하고 해외직접투자의 요인(要因)을 추론하였다. 근년에 해외직접투자가 급증하면서 해외직접투자의 경제적 효과에 대한 관심이 높아지고 산업공동화를 우려하는 견해도 대두되고 있다. 특히 우리 기업의 해외진출을 진출(進出)이 아닌 탈출(脫出)로 인식하기도 한다. 고임금, 고금리, 고지가, 고물류비 등 국내의 고비용 구조가 우리 기업을 해외로 몰아내고 있다는 것이다. 본고는 해외투자에 관한 이러한 시각이 우리 기업의 해외투자가 기업고유(企業固有)의 자산(資産) 또는 경쟁우위(競爭優位)를 활용 강화하기 위해 이루어지는 측면을 간과하고 있음을 지적한다. 본고는 다음과 같은 점을 강조한다. 우선 해외투자는 경쟁우위가 증가하는 부문(본고에서는 수출비중이 커지는 부문)에서 오히려 더 자주 이루어지는 경향이 있다는 것이다. 이는 절충적 패러다임에서의 소유권우위적 요소가 해외투자의 요인 및 양상을 설명하는 데 중요함을 의미한다. 우리나라의 최대 수출업종인 조립금속 기계장비부문에서의 해외투자 증가도 이러한 맥락에서 보면 아주 당연하다고 할 수 있다. 그리고 조립금속 기계장비부문의 해외투자 내용을 살펴보면 주로 보급률이 높은 중저급 성숙기제품 중심으로 해외투자가 이루어지고 고급제품은 주로 국내에서 생산되거나 선진기술습득을 위해 선진국에서 생산되고 있는 것으로 판단된다. 결과적으로 주요수출업종(主要輸出業種)에서의 해외투자(海外投資)는 오히려 당연하고 내용면에서도 국내경제(國內經濟)의 구조고도화(構造高度化)를 저해하지는 않는 것으로 판단된다. 본고는 향후 정책이 해외직접투자가 국내산업구조(國內産業構造)의 질적(質的) 고도화(高度化)에 효과적(效果的)으로 기여하는 방향으로 마련되어야 함을 강조하고 이를 위해 국내(國內) 기술기반(技術基盤)의 강화(强化), 고급인력(高級人力) 개발(開發) 등을 제안한다. 해외직접투자의 증가가 국내 고부가 직종의 증가로 이어지고 이것이 저부가 직종의 감소를 상회하도록 해야 하고, 이러한 정책이 실패하면 국내의 고용감소는 불가피하며 고용감소를 우려하여 해외직접투자를 인위적으로 규제하는 것은 고용사정을 더욱 악화시킬 뿐임을 강조한다.

• Journal of Digital Convergence
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• v.13 no.4
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• pp.175-189
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• 2015

As issues of Fintech(Financial technology) emerge, research on electronic banking is growing and garnering much attention in the market. This study analyzed 184 studies on e-banking over 15 years, from 2000 to 2014. Using meta-analysis, the paper draws attentions to the trends in domestic electronic banking studies. Interest peaked in 2008, when 28 papers were published and 35 theses in Information Security and Cryptology were announced. This research focus emphasizes the impact of e-banking services, technology and infrastructure, and laws and regulations on society. Electronic payment systems are a focal point of research on technology and infrastructure. Research on the e-finance market have influenced studies on the financial progress and other social issues. Benefits of this research include a better understanding of the trends in electronic banking studies and its influence on related fields, as well as help electronic banking-related policies and technology research.

• Convergence Security Journal
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• v.4 no.2
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• pp.35-41
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• 2004

Proxy signature scheme based on delegation of warrant is studied in these days. Proxy signature Is a signature scheme that the original signer delegates his signing warrant to the proxy signer, and the proxy signer creates a signature on behalf of the original signer. For using this scheme, the security for protecting from the forgeability or misuse is necessary. There are several security requirements for using the proxy signature schemes. In this paper we suggest the proxy-register protocol scheme that original signer registers to the verifier about the proxy related information. In our scheme, verifier verifies the signature that original signer creates about the proxy information and sets the warrant of proxy signer, validity period for proxy signature and some limitation. Finally, we will show the advantages of our suggestion by comparing with the previous proxy signature schemes.