• 디지털융복합연구
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• 제10권8호
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• pp.159-172
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• 2012

최근 데이터 폭증으로 인한 시스템 및 스토리지 성능저하에 따른 upgrade와 용량증설 등의 요구가 거세지고 있어 단편적인 증설에 의한 해결보다는 보다 근원적이고 장기적 관점의 해결책이 요구되고 있다. 본 논문에서는 이에 대한 해결책으로 기업의 운영 중인 스토리지 시스템의 운영 상태와 데이터 가치 분석을 통한 정보수명주기 기반 스토리지 계층화 방안을 개선안으로 제시하고 구현하였다. 본 연구를 통해 체계화된 데이터 관리방안 수립과 정보수명주기 기반 계층화된 스토리지 시스템으로 재구성한 후 기존 대비 약 21%의 전체 Throughput이 개선되었고 장기적 관점에서 지속적인 품질유지 및 운영비용 절감에 매우 효과적임을 확인하였다.

• 한국수자원학회논문집
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• 제39권3호
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• pp.227-240
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• 2006

지표수의 수문순환 및 성분의 변동 영향 요소로는 강우, 증발, 토양수분 등의 자연적인 요소와 도시화 및 유역내 저류시설물 등의 인위적인 요소가 있다. 특히, 장기 유출 변동에 영향을 끼치는 인위적인 요소 중 저류시설을 대표적으로 들 수 있는데, 이들 영향은 단기적으로는 유출 감쇄특성의 변화, 장기적으로는 저류량 증가에 따른 건기 계절유량의 증가, 년 유황 또는 유출 특성의 변화 등의 영향을 예측할 수 있다. 우리나라와 같은 인공 저류시설이 산재한 지역에서는 자연유량 산정용 수문 순환모형을 고려하기가 곤란하며, 이들 저류시설물의 장기유출에의 메커니즘을 규명하고, 물리적 및 추계적 분석기술을 개발하며, 실 유역에의 적용을 통하여 저류시설물이 장기 유출 분석의 신뢰도에 어느 정도 영향을 주고 있는 지를 분석하는데 본 연구의 목적이 있다. 본 연구에서는 다양한 장기유출 모형 중 저류시설물 요소를 다양하게 모의할 수 있는 연속형 반분포형 모형인 SWAT모형을 이용하여 태화강 유역을 대상으로 유역내 저류시설물의 하류 장기유출에의 영향 분석을 다양한 시나리오를 통해 정량적인 영향 분석을 수행하였다.

• 한국인쇄학회지
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• 제30권3호
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• pp.23-33
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• 2012

We studied simultaneously the electronically written data affected in the use of thermal transfer discs and the recoding strategy between recoding drives for the stable long term preservation of optical discs which are commonly used in an electronic data storage device. The most important thing in the archiving preservation might be a choice of a device, however the use of thermal transfer recording discs is not good for long term data preservation because the thermal effect on the recoding data is critical which means that the data are recorded not under best condition but under bad condition. We inspect the strategies of recoding data from 12 brands of optical discs and drives of 7 brands and it turns out the recoding strategy is needed first for the long term preservation of electronic recording data. Thus, without affecting data quality and deformation of optical discs, the choice of optimal disc and drive in recoding data will be a solution for the long term preservation of recoding data.

• Nuclear Engineering and Technology
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• 제28권3호
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• pp.257-264
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• 1996

The conventional Equipment Environment Qualification (EEQ) envelope is developed based on the containment responses during the design basis events. The Safety Depressurization System (SDS) design without In-containment Refueling Water Storage Tank (IRWST) adopted in the Ulchin 3&4 challenges the conventional EEQ envelope during long term Feed and Bleed (F&B) operation due to the direct discharge of high mass and energy into the containment. Therefore, it is necessary to confirm that the containment pressure and temperature history during the long term F&B operation does not violate the conventional EEQ envelope. However, this subject has never been quantitatively assessed before. To investigate the success path of long term F&B operation this paper analyzes the thermal hydraulic response of the containment and Reactor Coolant System (RCS) until the completion of depressurization and cooldown of RCS into Shutdown Cooling System (SCS) entry condition. It is found that the SCS entry condition can be reached within 6 hours without violating the EEQ curve by proper operation of SDS valves, High Pressure Safety Injection (HPSI) pumps and active Containment Heat Removal System (CHRS). The suggested strategy not only demonstrates the feasibility of long term F&B operation but also can be utilized in the preparation of Emergency Procedure Guidelines (EPGs)

• 한국태양에너지학회 논문집
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• 제26권3호
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• pp.1-8
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• 2006

The objective of this research is to study on the analysis of long-term performance characteristics of various solar thermal system for heating protected horticulture system for reducing heating cost, increasing the value of product by environment control, and developing advanced culture technology by deploying solar thermal system. Long term field test for the demonstration was carried out in horticulture complex in Jeju Island. Reliability and economic aspect of the system which was operated complementary with thermal storage and solar hot water generation were analyzed by investigating collector efficiency, operation performance, and control features. Optimum operating condition and its characteristics were closely investigated by changing the control condition based on the temperature difference which is the most important operating parameter. However, it is expected that, in high-insolation areas where large-scale ground storage is adaptable, solar system demonstrated in the research could be economically competitive and promisingly disseminate over various application areas.

• Clinical and Experimental Pediatrics
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• 제59권sup1호
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• pp.37-40
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• 2016

Mucopolysaccharidosis type III (MPS III) is a rare genetic disorder caused by lysosomal storage of heparan sulfate. MPS IIIB results from a deficiency in the enzyme alpha-N-acetyl-D-glucosaminidase (NAGLU). Affected patients begin showing behavioral changes, progressive profound mental retardation, and severe disability from the age of 2 to 6 years. We report a patient with MPS IIIB with a long-term follow-up duration. He showed normal development until 3 years. Subsequently, he presented behavioral changes, sleep disturbance, and progressive motor dysfunction. He had been hospitalized owing to recurrent pneumonia and epilepsy with severe cognitive dysfunction. The patient had compound heterozygous c.1444C>T (p.R482W) and c.1675G>T (p.D559Y) variants of NAGLU. Considering that individuals with MPS IIIB have less prominent facial features and skeletal changes, evaluation of long-term clinical course is important for diagnosis. Although no effective therapies for MPS IIIB have been developed yet, early and accurate diagnosis can provide important information for family planning in families at risk of the disorder.

• 한국수자원학회논문집
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• 제31권1호
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• pp.95-103
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• 1998

댐 퇴사량 예측방법은 수리학적 메커니즘을 이용하는 방법과 실측자료를 설계치로 적용하는 경험적 방법으로 구분할 수 있다. 전자는 물리적 해석방법으로 단기간에 이루어지는 현상을 규명하는데 적용할 수 있으며, 후자는 댐사수량 결정등 장기적인 설계변수 추정에 용이하게 이용할 수 있다. 이중 경험적 자료인 배사비 곡선식을 이용하면 월단위의 저수지 운영이 가능하며, 저류량에 대응하는 퇴사량을 정보변수로 추적하면 퇴사관리의 최적운영이 가능하다. 이와 같은 접근방법은 퇴사량에 의하여 시간적으로 변하는 댐 유효저수용량을 최적으로 관리할 수 있는 운영방안을 제공할 수 있다. 본 연구는 배사비 곡선을 이용한 장기 댐 퇴사량 예측방법을 제시하고 잇다. 개발된 방법을 중국 황하유역에 위치한 분하댐을 대상으로 장기간의 댐 운영을 모의하여 예상되는 퇴사량과 용수공급능력 분석에 적용하였다.

• Mycobiology
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• 제46권3호
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• pp.242-253
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• 2018

Onion (Allium cepa L.) is one of the major vegetable crops in Korea that are damaged and lost by pathogenic fungal infection during storage due to a lack of proper storage conditions. The aim of this study was to determine an appropriate control measure using thymol to increase the shelf life of onions. To control fungal infections that occur during low-temperature storage, it is necessary to identify the predominant fungal pathogens that appear in low-temperature storage houses. Botrytis aclada was found to be the most predominant fungal pathogen during low-temperature storage. The antifungal activity of the plant essential oil thymol was tested and compared to that of the existing sulfur treatments. B. aclada growth was significantly inhibited up to 16 weeks with spray treatments using a thymol solution. To identify an appropriate method for treating onions in a low-temperature storage house, thymol was delivered by two fumigation treatment methods, either by heating it in the granule form or as a solution at low-temperature storage conditions (in vivo). We confirmed that the disease severity was reduced up to 96% by fumigating thymol solution compared to the untreated control. The efficacy of the fumigation of thymol solution was validated by testing onions in a low-temperature storage house in Muan, Jeollanam-do. Based on these results, the present study suggests that fumigation of the thymol solution as a natural preservative and fungicide can be used as an eco-friendly substitute for existing methods to control postharvest disease in long-term storage crops on a commercial scale.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2008년도 추계학술대회A
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• pp.1391-1393
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• 2008

In this paper, the long-term reliability for 1.25G transceiver in use of high speed optical access network is investigated. High temperature storage tests and accelerated life tests are used to long-term reliability. Accelerated aging test have been during 3,000 hour of the three accelerated aging conditions by caused high temperature stress. Mean life is assumed to follow the Arrhenius relationship and analysis from the failure data obtained in the accelerated aging conditions.

• Plant Biotechnology Reports
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• 제3권1호
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• pp.103-109
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• 2009

In this study we established reliable methods for conservation of seeds of Phaius tankervilleae as an orchid genetic resource. The seeds, which were dehydrated to 5% water content and preserved at $4^{\circ}C$, showed no decrease in viability and germinability after three months. After storage for six months, however, the seeds showed a drastic decrease in germinability, even though survival rate was high. For long-term preservation of seeds of P. tankervilleae, cryopreservation is applied to the freshly harvested seeds. When the seeds were cryopreserved by the vitrification method for up to 12 months there was no apparent deterioration effect of storage time. These results indicate that cryopreservation by the vitrification method is useful for long-term conservation of P. tankervilleae seeds, which are difficult to preserve for more than three months under dry and low-temperature conditions.