• 한국HCI학회:학술대회논문집
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• 2008.02b
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• pp.527-533
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• 2008

본 연구는 기존 RPG에서 주요한 재미 요소로 기능하던 성장 모티프가 MMORPG(Massive Multi-user Online Role Palying Game)에서 어떤 식으로 변형되어 나타나는 지 살펴본다. 성장과 역할 수행을 통해 재미를 얻는 게임인 MMORPG는 성장 서사에서 많이 나타나는 구조인 여정형 혹은 탐색형의 구조를 보편적으로 차용하고 있다. 그러나 기존 서사물에서 성장 모티프가 정체성 찾기와 같은 내면적인 변화를 나타내기 위해 구조를 차용하는 반면, 게임에서는 위의 구조를 통해 얻은 성장의 결과물을 수치의 증가나 외적 형태의 변화를 통해 나타낸다. 즉, 경험치나 아이템을 통해 성장이 수치화되어 나타나는 것이다. 이는 여정형 탐색담이라는 성장 서사의 보편적 구조에서 게임적인 특수성이 더해진 것이라 할 수 있다. 성장 소설만의 서사적 유형이란 바로 주인공의 변화 양상이 미숙에서 성숙으로, 불완전에서 완전으로, 결핍에서 충족으로 변화하는 과정을 담고 있는 이야기적 특질을 의미한다. 그러한 미숙하고 불완전한 존재가 변화하게 되는 계기와 과정, 그리고 그 결과로 구조화된 유형적 특질을 갖고 있는 소설 양식이 성장소설이라 할 수 있는 것이다. 이러한 구조화된 유형적 특질은 신화나 민담에서는 탐색담이나 여행담으로 나타난다. 게임에서의 성장은 캐릭터의 성장과 직결된다. 본격적으로 플레이어와 동일시되어 성장을 대리 경험적으로 체험하는 것은 D&D 온라인을 거쳐, 현재 MMORPG의 형태를 구현해낸 울티마 온라인이 이후부터이다. 세부적으로 구현된 세계와 온라인을 통해 생성된 방대한 네트워크 안에서 플레이어는 자신과 동일화된 캐릭터를 플레이하면서 대리경험을 하게 된다. 즉, 플레이어가 캐릭터의 성장에 작용하는 여러 가지 변수를 선택하고, 조작해가면서 자신만의 캐릭터를 생성해 나가면서, MMORPG가 구현하는 게임 세계에 구성원이자 일원이 되는 것이다. MORPG는 기존의 RPG의 선형적인 성장에 비해 복합적인 양상을 보여준다. 문화에서의 성장 서사에서 일반적으로 발견되는 여정형의 탐색담은 개발자 서사인 배경 스토리에서 나타나며, 레벨시스템과 이에 따른 공간의 배치에 따라 플레이어에게 직접적인 영향'을 끼친다. 영속적인 세계와 플레이어 간의 상호작용을 통해 일어나는 사용자 서사는 완결된 형태의 캐릭터를 무의미하게 만든다. 플레이어는 비선형적인 성장을 끊임없이 계속하게 되는 것이다.

• Clinical and Experimental Reproductive Medicine
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• v.30 no.4
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• pp.293-298
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• 2003

목 적: 인간의 배아줄기세포는 전분화능과 영속성을 가지고 있어 발생 및 분화에 관련된 기초 연구 뿐 만 아니라 재생의학, 약물검색 등에서도 매우 유용한 재료로 이용될 수 있다.본 연구에서는 유전체의 변형이 배아줄기세포주의 확립 효율에 미치는 영향을 살펴보고자 비정상적인 포배기 배아에서 내세포괴를 분리하여 배양하였다. 연구 방법: 인간의 체외수정 및 배아이식술에서 공여 받은1개 또는3개의 전핵이 관찰되는 비정상 수정란 (n=20)과 착상전 유전진단에서 이수성이 확인된 배아 (n=27)를 대상으로 하였다. 일반적인 immunosurgery 방법으로 영양배엽세포들을 제거하고 내세포괴를 분리한 후 PMEF 혹은 STO feeder 세포위에서 배양하였다. 배아줄기세포의 배양시스템을 검증하기 위해서 이미 확립된 Miz-hES1 cell line을 동시에 같은 조건 하에서 계대배양하였다. 결 과: 비정상 수정란에서 발생된 포배기 배아에서 분리한 1개의 내세포괴가 배아줄기세포와 유사한 colony를 형성하였으나, 계대배양에는 실패하였다. 이수성 배아에서 발생된 포배기 배아의 내세포괴 배양에서는 두개의 colony가 계대배양 중에 영양배엽세포의 형태로 분화되어 미분화 상태를 유지하지 못하였다. 동일한 시기와 조건 하에서 계대배양된 Miz-hES1 cell line이 미분화상태로 유지됨을 karyotyping (46, XY)과 immunophenotyping (positive in SSEA-3 and -4)으로 확인하였다. 결 론: 본 연구의 결과에서 비정상 수정란과 이수성 배아에서 발생된 포배기 배아에서 유래한 내세포괴는 배아줄기세포주 확립 및 미분화 상태 유지 능력이 매우 저조한 것으로 여겨진다. 따라서, 인간의 배아줄기세포주를 확립하는데 있어 배아의 정상여부가 중요한 요소로 작용할 것으로 생각된다.

• Journal of the Korea Organic Resources Recycling Association
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• v.23 no.2
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• pp.47-52
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• 2015

A microbial fuel cell (MFC) is a device that can be obtained electricity from a variety of organic through the catalytic reaction of the microorganism. The MFC can be applied to various fields, and research is required to promote the performance of the microbial fuel cell for commercialization. The lower performance of an MFC is due to oxygen reduction at the cathode and the longer time of microbial degradation at anode. The MFC amount of power is sufficient but, in consideration of many factors, as a renewable energy, now commonly power density as compared to Nafion117 it is an ion exchange membrane used is PP (Poly Propylene) from 80 to about 11 fold higher, while reducing the cost to process wastewater is changed to a microporous non-woven fabric of a low cost, it may be energy-friendly environment to generate electricity. All waste, in that it can act as a bait for microorganisms, sustainability of the microbial fuel cell is limitless. The latest research on the optimization and performance of the operating parameters are surveyed and through the SSaM-GG(Smart, Shared, and Mutual- Green Growth) or GG-SSaM(Green Growth - Smart, Shared, and Mutual) as the concept of sustainable development in MFC, the middle indices are developed in this study.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.23 no.3
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• pp.107-111
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• 2023

Journaling techniques are widely used to maintain a consistent file system state in the event of a system crash. As existing journaling techniques are designed for block storage such as HDDs, they are not efficient for byte-addressable persistent memory media. This paper proposes a metadata journaling technique for in-memory file systems that has the ability of avoiding inconsistent file system states in crash situations. The proposed journaling technique reduces a large amount of writing by making use of the byte-addressable feature of memory media and bypasses heavy software I/O stack. Experimental results with the IOzone benchmark show that the proposed journaling technique improves the performance of Ext4 by 49.2% on average.

• Journal of Environmental Policy
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• v.5 no.1
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• pp.25-43
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• 2006

This study is intended to develop an economic feasibility methodology of A/R CDM projects based on two project cases in China and Vietnam and to evaluate the project profitability from the view point of credit type selection between temporary CER (tCER) and long term CER (lCER) as well as from the aspect of CER prices by using indicators IRR, the year in which a single year profit is achieved and the year in which the accumulated deficit is cleared. For A/R CDM projects of industrial plantations, tCER is more suitable than lCER. Profitability of A/R CDM projects depend on the price of wood and CERs. In the case that the project participants take responsibility for replacement of credits to make the price of their CERs at higher levels, thus the project may not be feasible as a CDM project. However, minimum required tCER prices without replacement are 11US$/t $CO_2$, thus the project may be feasible under the future carbon market scheme.

• Journal of the Korean Society for Marine Environment & Energy
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• v.14 no.1
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• pp.51-64
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• 2011

Carbon dioxide Capture and Storage (CCS) is one of the key players in greenhouse gas (GHG) reduction portfolio for mitigating climate change. CCS makes simultaneously it possible not only to reduce a huge amount of carbon dioxide directly from the emission sources (e.g., coal power plant) but also to maintain the carbon concentrated-energy and/or industry infrastructure. Internationally, the United Nations Framework Convention on Climate Change (UNFCCC) is dealing the agenda for considering the possibility of including CCS project as one of Clean Development Mechanism (CDM) projects. Despite its usefulness, however, there are the controversies in including CCS as the CDM project, whose issues include i) non-permanence, including long-term permanence, ii) measuring, reporting and verification (MRV), iii) environmental impacts, iv) project activity boundaries, v) international law, vi) liability, vii) the potential for perverse outcomes, viii) safety, and ix) insurance coverage and compensation for damages caused due to seepage or leakage. In this paper, those issues in considering CCS as CDM are summarized and analyzed in order to suggest some considerations to policy makers in realizing the CCS project in Korea in the future.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.35 no.6
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• pp.660-665
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• 2002

In Korea, an olive flounder is very popular fish food item. However, due to the increasing human population, the present catches of the olive flounder may not be sufficient to satisfy the present demand. To increase the supply of the olive flounder, aquaculture has been begun. An interest in the aquaculture of the olive flounder has been increased recently because of its characteristics of good growth and high price in the market, However, the productivity of the olive flounder aquaculture depends on economic inputs such as fuels, facilities, and labor. The rapid growths of the olive flounder aquaculture and the concerns about economic and ecological sustainability have focused peoples attention on the aquaculture industry. In this study, an energy systems model was built to simulate the variation of sustainability on the aquaculture of olive flounder, The results of simulation based on calibration data in 1995 show that olive flounder production yield and asset slowly increase to steady state because of the law of supply and demand. The results of simulation based on the variation of oil price show that the more increase the oil price, the more decrease the olive flounder economic yield and asset. Energy sources required for systems determine the sustainability of systems. Conclusionally, the present systems of the olive flounder aquaculture should be transformed to ecological-recycling systems or ecological engineering systems which depend on renewable resources rather than aquaculture systems which depend on fossil fuels, and be harmonized with the fishing fisheries by the sustainable use of renewable resources in the carrying capacity.

• Korean journal of applied entomology
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• v.42 no.4
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• pp.367-381
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• 2003

Dispersal polymorphism in insects Is a kind of adaptive strategy of the life history together with the diapause, consisting of the “long-winged or alate forms” of migratory phase and the “short-winged or apterous forms” of stationary phase. Dispersal polymorphism is a polymorphism related with the flight capability, and has three categories ; the wing polymorphisms, flight muscle polymorphisms, and flight behavior variations. Phase variation is another type of dispersal polymorphism varying in morphology, physiology and wing forms in response to the density of the population. The dispersal migration is a very adaptive trait that enables a species to keep pace with the changing mosaic of its habitat, but requires some costs. In general, wing reduction has a positive effect on the reproductive potential such as earlier reproduction and larger fecundity The dispersal polymorphism is a kind of optimization in the evolutionary strategies of the life history in insects; a trade-off between the advantages and disadvantages of migration. Wing polymorphism is a phenotypically plastic trait. Wing form changes with the environmental conditions even though the species is the same. Various environmental factors have an effect on the dispersal polymorphisms. Density dependent dispersal polymorphism plays an important role In population dynamics, but it is not a simple function of the density; the individuals of a population may be different in response to the density resulting different outcomes in the population biology, and the detailed information on the genotypic variation of the individuals in the population is the fundamental importance in the prediction of the population performances in a given environment. In conclusion, the studies on the dispersal polymorphisms are a complicated field in relation with both physiology and ecology, and studies on the ecological and quantitative genetics have indeed contributed to understanding of its important nature. But the final factors of evolution; the mechanisms of natural selections, might be revealed through the studies on the population biology.

• Journal of Soil and Groundwater Environment
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• v.11 no.3
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• pp.31-42
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• 2006

Drought indices, such as PDSI (palmer Drought Severity Index), SWSI (Surface Water Supply Index) and SPI (Standardized Precipitation Index), have been developed to assess and forecast an intensity of drought. To find the applicability of groundwater level data to a drought assessment, a correlation analysis between SPI and groundwater levels was conducted for each time series at a drought season in 2001. The comparative results between SPI and groundwater levels of shallow wells of three national groundwater monitoring stations, Chungju Gageum, Yangpyung Gaegun, and Yeongju Munjeong, show that these two factors are highly correlated. In case of SPI with a duration of 1 month, cross-correlation coefficients between two factors are 0.843 at Chungju Gageum, 0.825 at Yangpyung Gaegun, and 0.737 at Yeongju Munjeong. The time lag between peak values of two factors is nearly zero in case of SPI with a duration of 1 month, which means that groundwater level fluctuation is similar to SPI values. Moreover, in case of SPI with a duration of 3 month, it is found that groundwater level can be a leading indicator to predict the SPI values I week later. Some of the national groundwater monitoring stations can be designated as DIW (Drought Index Well) based on the detailed survey of site characteristics and also new DIWs need to be drilled to assess and forecast the drought in this country.

• Journal of The Korean Society of Grassland and Forage Science
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• v.31 no.2
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• pp.113-118
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• 2011

This experiment was carried out to select the adaptability, forage production and quality of pasture species at paddy field from 2007 to 2009 at Jeonnam province. Among pasture species, Italian ryegrass was somewhat good for waterlogging, production, and disease and insect resistance. Fresh and dry matter yields of Italian ryegrass was the highest as 67,368 kg and 17,677 kg per ha among six species. The dry yield of Tall fescue mixture (Orchardgrass, Tall fescue, Perennial ryegrass, Kentuck bluegrass, White clover) and Tall fescue were also high as 15,589 kg and 14,693 kg per ha, respectively. Crude protein of Tall fescue and Tall fescue mixture were high as 10.4% and 13.5%, respectively. The result of this study showed that Italian ryegrass, Tall fescue mixture and Tall fescue had good growth characteristics and forage productivity at paddy field in southern region of Korea.