• Environmental and Resource Economics Review
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• v.16 no.1
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• pp.129-169
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• 2007

The purpose of this study is to experiment and simulate the newly-updated Second Generation Model for Korea (SGM-Korea). With the updated model, we tried to simulate effect of carbon tax on $CO_2$ emissions and other macroeconomic variables for Korea. The baseline data are compared with projected profiles by various scenarios to evaluate its performance. Our contribution in this study is to having up-graded the model from its earlier version by building new hybrid input-output table based on 2000 input-output and energy balanced tables. According to our estimation, total $CO_2$ emission in Korea has already increased in 2000 to about 1.86 times the 1990 figure. The level of carbon tax required for the current level of $CO_2$ emission to be reduced to the 1995 or 2000 level seems to be too high for Korean economy to bear. It is possible to find a reasonable level of carbon tax, however, if it can combine it with improvement of energy efficiency at the rate of 0.5% to 1% per year. For Korea to meet its obligation to reduce $CO_2$ emissions, therefore, it is imperative for her to improve energy efficiency as well as to develop alternative energy source reducing its dependence on fossil fuel.

• Economic and Environmental Geology
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• v.49 no.3
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• pp.181-191
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• 2016

We estimate the eruption history and magmatic eruptive volumes of each rock units to evaluate the volcanic eruption scale and volcanic hazard of the Ulleung Island. Especially, Maljandeung Tuff represents about 19~5.6 ka B.P. from $^{14}C$ dating, and Albong Trachyandesite, about 0.005 Ma from K-Ar dating in recent age dating data. These ages reveal evidences of volcanic activities within the last 10,000 years, indicating that the Ulleung Island can classify as an active volcano with possibility of volcanic eruption near future. Accumulated DRE-corrected eruptive volume is calculated at $40.80km^3$, within only the island. The calculated volumes of each units are $3.71km^3$ in Sataegam Tuff, and $0.10km^3$ in Maljandeung Tuff but $12.39km^3$ in accounting the distal and medial part extended into southwestern Japan. Volcanic explosivity indices range 1 to 6, estimating from the volumes of each pyroclastic deposits. The colossal explosivity indices are 5 in Sataegam Tuff, and 6 in Maljandeung Tuff in accounting the distal and medial part. Therefore, it is necessary for appropriate researches regarding possibility of volcanic eruption of the island, and establishment system of the evaluation and preparation for volcanic hazard based on the researches is required.

• Resources Recycling
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• v.7 no.3
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• pp.52-57
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• 1998

The objective of this study was to investigate the effect of cow manure as additive material on the ripening of sewage s sludge for vermistabiJization. The changes of the waste properties by ripening for 50days were observed as a function of the v various mixture ratios of sewage sludge ‘and cow manure. The pH values of the mixture wastes decreased from 7.5-7.67 to 6_ 9~7.2 by the ripening for 50days, and the mixture ratio made dIfferent pH values. The initial value of oxidation-reduction p potential (Eh) of the mixture waste was a negative (-) value indicating an unfavorable condition for earthworm after, but the v values of Eh increased with the opening time. The Increase rate at Eh value was prop$\alpha$rtional to the mixture ratio of cow m manure. The value of alkalinity was also changed into the favorable range for earthworm after 50days except for non-use of 1 the cow manure When the mixture ratio of the cow manure increased from 10% to 30%, the growth of earthworms increased h from 63.7% to 88.3 % tor the survival rate, 265% to 321% for the liveweight increasing rate and 66.7_7% to 91% for hatching f rate of the cocoons. It can be concluded that the proper content of tbe cow manure in the sewage sludge to ensure effective v vermistabilization was over 20%, when the mixture was ripened during 50 days. The quantity of ingestion and 며ectian at 20%-30% was found to be O.15--i.L18g sludge and 0 1l--O.14g solid per capacity earthworm per day, respectively.

• Resources Recycling
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• v.28 no.6
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• pp.26-35
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• 2019

This study aims to introduce and economical review on the possibilities of rare earth elements(REEs) recovery from coal ashes and the analysis of economical evaluation factors based on the data for securing domestic rare earth elements. The cut-off grade of REEs on recovering from coal ash was confirmed to be 1,000 ppm on total rare earth oxides(TREO) basis, and while the economic value of coal ash changed with contents and specific elements of rare earth elements. This shall be resulted in the price differences of rare earth elements required by the current industry, and it probably varies depending on the future demand of rare earth components. For developing of commercial recovery technology on REEs in coal ashes, many researches have been carried out by various analyzing methods, such as evaluation of holding value of REEs in ashes, assessment between supply and demand of industry, comparison of investment and its profitability for the REEs's production from coal ashes, and so on. Although these methods have been suggested, its recovery system with economical feasibility could not been confirmed up to present. In this reason, the process design of recovering REEs from coal ash shall be researched continuously to solve the problems of the global rare earth market. And also these researches shall be conducted actively in Korea for the purpose of securing the REEs resources and their recovering technologies.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.16 no.4
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• pp.133-137
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• 2016

The video and audio information occupies a large portion of the IoT information. Various sensors can be used in a more accurate situation awareness and the absence of the main information has been required. Increasing in resource management in accordance with the use of various sensors. As a method to reduce the resources required in the communication of the various sensors and find the possibility to process the sensor information that can take the place of the other sensor. In this paper, using the LIS302 DL MEMS motion sensor to measure the data in the ping-pong ball, shuttlecock, tennis ball falling into table tennis. Data measured in the three object was confirmed that in proportion to the amount of impact. This experiment using the accelerometer can be confirmed that changes in the amount of impact. The results using a single multi-function sensor showed a possible implementation. In addition, the recognized in consideration of the situation in the early development stage of the multi-function sensor.

• Proceedings of the Korean Society of Postharvest Science and Technology of Agricultural Products Conference
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• 2003.04a
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• pp.147-148
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• 2003

최근 새로운 바다 자원으로서 “해양 심층수”가 주목받고 있다. 해양 심층수(深層水, deep sea water)는 태양광이 도달하지 않는 수심 200 m 이상 깊이의 물로 수온이 2$^{\circ}C$ 이하로 연중 거의 변화가 없는 저온안정성과 무기 영양염을 다량 포함하는 특징이 있어 심층수의 활용도는 매우 높다. NaCl만 제거하면 훌릉한 생수가 되기 때문에 심층수를 원료로 한 식품, 화장품, 의약품 개발에 대한 관심이 높아지고 있다. 미국, 일본 등지에서는 10여년전부터 심층수를 이용한 에너지, 수자원, 생수 및 식품 산업이 활발히 진행되어졌다. 현재 식품 산업분야로는 두부제조, 빵, 청주, 간장, 된장 등의 발효식품에 대한 연구가 진행되어지고 있다. 심층수를 적당하게 첨가하면 알코올 농도가 높아지는 발효강화작용이 있다. 새로운 건강 먹거리를 갈망하는 현대인들에게 해양 심층수를 이용한 발효식품은 매우 환영받을 것으로 사료된다. 이에 본 연구는 해양 심층수의 다양한 자원성을 효율적으로 활용하기 위해 심층수의 청정성과 풍부한 미네랄을 함유한 심층수의 농도에 따른 효모의 증식도를 알아봄으로서 적응력 강한 효모를 조사하였다. 실험에 사용한 해양 심층수는 淸凉飮料水(日本ナチュラルヘルス株式會社, 深透水 1550) 사용하였다. 효모균주는 경북과학대 전통식품 연구소에서 보유하고 있는 9종의 효모를 사용하였으며, 심층수 경도 250, 500, 1000의 심층수와 1차 증류수(대조군)에 sucrose 10% 첨가한 당용액을 사용하였다. 또한 당의 적응력을 알아보기 위해 sucrose 10, 15, 20% 첨가 당용액을 사용하여 Sacch.cerevisiae kluyvery DJ97 효모의 증식도를 알아보았다. 그 결과, Saccharomyces cerevisiae 12호 균주가 심층수 경도 500인 시험군에서 증식력이 높았으며, Saccharomyces cerevisiae 901 균주는 경도 1000인 시험군이 대조군에 비해 증식력이 높게 나타나 효모균주의 종류와 심층수의 첨가량에 따라 적응력이 차이가 있었다. 당농도와 심층수 첨가량에 따른 효모 균주의 발효력을 알아본 결과 심층수 경도 200의 당 10% 첨가군에서 가장 잘 증식하는 것으로 나타나, 알코을 효모균주의 발효력을 높이는데는 최적의 농도가 있음을 알 수 있었다. 따라서 심층수를 이용한 다양한 발효식품에 대한 연구가 요구되어진다.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.42 no.6
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• pp.445-452
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• 2014

This paper discusses the multifrontal direct solution method with out of core storage for large scale structural analysis in a limited computing resource. Large scale structural analysis requires huge amount of memory space and computation, so out of core solution method is needed in limited computing resource. In this research, out of core multifrontal solution algorithm which utilize the small size of physical memory and minimize the amount of access of low speed out of core storage is introduced. Three ideas, which are stack space in lower trianglar part of square factorization matrix, inverse stack data structure and selective data caching and recovery by data block size, are proposed.

• Economic and Environmental Geology
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• v.38 no.3 s.172
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• pp.247-260
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• 2005

Extractable concentrations (0.1 N & 1.0 N HCI) of heavy metals in roadside sediments are lower than guidelines for soil recommended by Ministry of Environment. Heavy traffic areas (such as No. 7 national road) show high contents of heavy metals, especially, at curved areas, gully pot, crackdown areas on overspeed, pedestrian crossing etc. Fine fractions $(<63\;{\mu}m)$ of roadside sediments have the highest concentrations of heavy metals, but mass loadings of heavy metal are determined by coarse fractions $(>100{\mu}m)$, due to washing out of fine fraction sediment by runoff water. Proper treatment facilities are needed to control the inflow of fine roadside sediments from No. 7 national road and bridge such as Hanmul bridge.

• Journal of Biomedical Engineering Research
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• v.25 no.6
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• pp.617-621
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• 2004

In recent, researchers in the field of Bioinformatics need to analyze thousands of genome sequences efficiently according to introduce of new analysis methods and technologies such as genome expression microchip. This rapid growth in the field of bio-engineering needs computing resources to analyze rapidly for genome sequences, but it does not introduce the computing resources due to an enormous investment expense. The core factor of this study is integrated environment based PC-Cluster system & high speed access rate up to 155Mbps, continuous collection system for bio-information at home and abroad. The results of the study are establishment & stabilization of information and communication infrastructure, establishment & stabilization of high performance computer network up to 155Mbps, development of PC-Cluster system with 32 nodes, a parallel BLAST on Cluster system, which can provides scalable speedup in terms of response time, and development of collection & search system for bio-information.

• Journal of KIISE:Computing Practices and Letters
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• v.6 no.6
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• pp.555-568
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• 2000

The World Wide Web has become the largest virtual system that is almost universal in scope. In recent research, it has become effective to utilize idle hosts existing in the World Wide Web for running applications that require a substantial amount of computation. This novel computing paradigm has been referred to as the advent of global computing. In this paper, we implement and propose a mobile object-based global computing framework called Tiger, whose primary goal is to present novel object-oriented programming libraries that support distribution, dispatching, migration of objects and concurrency among computational activities. The programming libraries provide programmers with access, location and migration transparency for distributed and mobile objects. Tiger's second goal is to provide a system supporting requisites for a global computing environment - scalability, resource and location management. The Tiger system and the programming libraries provided allow a programmer to easily develop an objectoriented parallel and distributed application using globally extended computing resources. We also present the improvement in performance gained by conducting the experiment with highly intensive computations such as parallel fractal image processing and genetic-neuro-fuzzy algorithms.