Earticle

This paper presents a storage model named Peer to Cloud and Peer (P2CP). Assuming that the P2CP model follows the Poisson process or Little’s law, we prove that the speed and availability of P2CP is generally better than that of the pure Peer to Peer (P2P) model, the Peer to Server, Peer (P2SP) model or the cloud model. A key feature of our P2CP is that it has three data transmission tunnels: the cloud-user data transmission tunnel, the clients’ data transmission tunnel, and the common data transmission tunnel. P2CP uses the cloud storage system as a common storage system. When data transmission occurs, the data nodes, cloud user, and the noncloud user are all together involved to complete the transaction.

The storage environment of a Japanese woodblock print collection was assessed for organic acids. The active air sampling method was used to collect organic acid emissions in the low microgram range from areas of a selected woodblock print with different pigments, following which an off-gassing mitigation strategy based on the fan filter unit(FFU) system was investigated. Research findings revealed that the off-gassing behavior of woodblock prints is significantly impacted by storage practices and to a lesser degree by the pigments. The FFU system can be used as a mitigation strategy, but the permanence of the results depends on the storage conditions.

현재 대용량의 데이터는 다양한 분야에 활용됨에 따라 스토리지 시스템에서 확장성을 제공해야 한다. NAS와 SAN은 일반적으로 비교적 대규모 스토리지 시스템을 구축하는 데 사용된다. 네트워크 기반의 DAS는 네 트워크에 직접 연결되지만 NAS와 달리 TCP/IP를 사용하지 않고 이더넷 계층에서 통신하므로 TCP/IP 네트워크 스택으로 인한 오버헤드가 없다. 본 논문에서는 NDAS를 효과적으로 활용하는 데 필요한 다양한 시스템 매개변수 를 조사하고 실험하였다. 또한 일반적으로 사용되는 분산 시스템에 네트워크 기반의 DAS를 적용하여 성능 평가 를 수행하였다. 여러 개의 네트워크 기반 DAS를 이용하여 단일 저장소 풀을 구성하여 실제 워크로드를 수행했을 때 확장성을 확인하였다. 본 연구에서 제안하는 스토리지 시스템은 기존의 확장성이 필요한 저장 장치에 바로 활 용이 가능하다.

As large amounts of data are currently being utilized in various fields, storage systems must provide scalability. NAS and SAN are generally used to build a relatively large-scale storage system. NDAS is directly connected to the network, but unlike NAS, it does not use TCP/IP and communicates at the Ethernet layer, so there is no overhead due to the TCP/IP network stack. Based on these characteristics, NDAS is an effective solution for building cost-effective storage devices. In this paper, various system parameters needed to utilize NDAS effectively are investigated and tested. Also, performance evaluation is performed by applying NDAS to a commonly used distributed system. It also showed scalability when a single storage pool was configured with multiple NDAS storages to perform real workloads. The storage system proposed in this study can be directly applied to existing storage devices requiring scalability.

The effect of the nitrogen content of sawdust medium (1.2~1.8%) and the restriction stage temperature (2, 4, and 6oC) on the growth and storage characteristics of Flammulina velutipes (winter mushroom) were investigated. With increased nitrogen content, the growth days shortened and the yield of the fruiting body increased. The effect of restriction temperature on the growth of the fruiting body differed depending on the nitrogen content. No difference in restriction temperature was evident for T1 with a low nitrogen content of 1.28%. In medium with a nitrogen content ≥1.55%, the yield and length of the pileus and stipe increased as the restriction temperature decreased. The weight loss ratio according to the storage period did not change according to the nitrogen content in the medium. A low weight loss ratio of 1.50 to 1.93% was observed at a restriction temperature <4oC. When T3 with high nitrogen content in the medium was treated at a restriction temperature of 4°C, the fruiting body color values after 31 days of storage were 84.81 (L) and 6.3 (ΔE). This color change was minute compared to that after other treatments. The sensory characteristics score was 5.2 after 31 days of storage, and the quality remained acceptable for consumption.

최근 하수처리, 홍수조절, 광산침출수, 농업유출수 등의 처리에 습지를 이용하려는 시도가 증가하고 있다. 하지만 장기모니터링의 어려움으로 인해 습지에 대한 장기간의 자료들이 부족하여 습지의 올바른 이용이 어려운 실정이다. 이에 본 연구에서는 장기간의 자료 생성을 목적으로 한 수문분석의 일환으로 장기유출 수문모형인 SWAT(Soil and Water Assessment Tool)모형을 이용하여 토평천 유역의 우포, 목포, 사지포, 쪽지벌에 대한 저류량을 모의하였다. 이를 바탕으로 토평천 유역에 천변저류지를 조성하는 가상 시나리오를 작성하여 조성된 천변저류지의 저류량 거동을 분석하였다. 천변저류지의 조성에 따른 우포늪의 저류량 변화를 분석한 결과 천변저류지 조성에 따라 우포늪도 일정 정도의 영향을 받을 수 있음이 파악되었다.

In recent days, the cases of using wetlands in treating waste water, storm events, mining leachate, and agriculture effluents are increasing. But there is the lack of the data for wetlands because of the difficulty in long term monitoring. Such an aspect makes the proper use of wetland impractical. In this study for the purpose of generating a long term hydrologic data, the time series of storage amount for Upo, Mokpo, Sajipo, and Jjokjibeol in Topyeong watershed is simulated using SWAT model. Based on the SWAT-Topyeong model involved in several scenarios for constructing new washlands in Topyeong watershed, the temporal behavior of new washlands is analyzed. It is also revealed that the constructed washland can affect the Upo in some degrees.

This study evaluated the quality characteristics of Flammulina velutipesduring storage using modified atmosphere films of different thicknesses (20, 40, and 60 μm). The films included high-density polyethylene (HDPE) and low-density polyethylene (LDPE). F. velutipeswere stored at 1°C for six weeks, and quality was assessed based on weight loss, respiration rate, firmness, color parameters, β-glucan content, total phenolic content (TPC), and antioxidant activities (2,2-diphenyl-1- picrylhydrazyl and 2,2'-azino-bis [3-ethylbenzothiazoline-6-sulfonic acid] radical scavenging activities). All HDPE and LDPE films were more effective than the conventional film (polypropylene) at maintaining mushroom quality, particularly in the later stages of storage. In particular, LDPE films with thicknesses of 20 and 40 μm showed superior performance at reducing respiration rates and weight loss, while mushrooms packaged with these films retained higher TPC and antioxidant activities. The β-glucan content also remained more stable in mushrooms stored using HDPE and LDPE films. Although we did not evaluate changes in sensory properties or nutritional components, such as vitamins, our results suggest that the type and thickness of packaging films significantly influence the preservation of the quality of F. velutipesduring storage. Additionally, LDPE films with thicknesses of 20 and 40 μm were found to be the most suitable packaging materials for the distribution and storage of F. velutipes. Furthermore, these findings are expected to provide valuable insights into the selection of optimal packaging materials to extend the shelf life and maintain freshness during the postharvest handlingof F. velutipes.

연구목적: 최근 국내외에서 해킹으로 피해자의 데이터를 암호화하고 이를 풀어주는 대가로 금전적 대 가를 요구하는 랜섬웨어 피해가 증가하고 있다. 이에 다양한 방식의 대응기술과 솔루션에 대한 연구개 발이 진행되고 있으며, 본 연구에서는 데이터를 저장하는 저장장치에 대한 보안 연구개발을 통해 근본 적인 대응방안을 제시하고자 한다. 연구방법: 동일한 가상환경에 보안 저장영역과 일반 저장영역을 생 성하고 접근 프로세스를 등록하여 샘플 데이터를 저장하였다. 저장된 샘플 데이터의 침해 여부를 확인 하기 위해 랜섬웨어 샘플을 실행하여 침해 여부를 해당 샘플 데이터의 Hash 함수를 확인하였다. 접근 제어 성능은 등록된 접근 프로세스와 동일한 이름과 저장위치를 통해 샘플 데이터의 접근 여부를 확인 하였다. 연구결과: 실험한 결과 보안 저장 영역의 샘플 데이터는 랜섬웨어 및 비인가된 프로세스로부터 데이터의 무결성을 유지하였다. 결론: 본 연구를 통해 보안 저장영역의 생성과 화이트리스트 기반의 접 근 제어 방법이 중요한 데이터를 보호하는 방안으로 적합한 것으로 평가되며, 향후 기술의 확장성과 기 존 솔루션과의 융합을 통해 보다 안전한 컴퓨팅 환경을 제공할 수 있을 것으로 기대된다.

Purpose: Recently, ransomware damage that encrypts victim's data through hacking and demands money in exchange for releasing it is increasing domestically and internationally. Accordingly, research and development on various response technologies and solutions are in progress. Method: A secure storage area and a general storage area were created in the same virtual environment, and the sample data was saved by registering the access process. In order to check whether the stored sample data is infringed, the ransomware sample was executed and the hash function of the sample data was checked to see if it was infringed. The access control performance checked whether the sample data was accessed through the same name and storage location as the registered access process. Result: As a result of the experiment, the sample data in the secure storage area maintained data integrity from ransomware and unauthorized processes. Conclusion: Through this study, the creation of a secure storage area and the whitelist-based access control method are evaluated as suitable as a method to protect important data, and it is possible to provide a more secure computing environment through future technology scalability and convergence with existing solutions.

This experiment was conducted to investigate the changes in freshness parameters and determine the optimal UV-B irradiation conditions for each storage period for Heuktari, an oyster mushroom cultivar, grown under LED lightNo significant changes were observed in the CO2 and O2 content until day 12 of storage; however, after day 15, the CO2/O2 ratios were higher in the UV-treated groups than in the untreated groups. No color difference was observed between the UV-treated and untreated groups. In all UV-treated groups, hardness decreased over time; however, the group irradiated for 15 minutes showed higher hardness values t han those of the untreated group. The UV-irradiated group showed higher ergosterol content than did the untreated group, and scanning electron microscopy revealed that mushroom cell wall destruction increased with increased UV treatment time. Overall, these findings confirmed that UV-B irradiation increased the ergosterol content of Heuktari but decreased its freshness and negatively impacted other storage characteristics.

가상 데스크톱 인프라는 가상 머신을 실행하여 가상 데스크톱 환경을 원격에 있는 사용자에게 제공한다. 이 서버에서가장 병목이 되는 부분은 저장장치이다. 이 저장장치의 성능을 극대화하기 위해서 가상 데스크톱 인프라에 주 메모리즉 DRAM을 저장장치로 사용하는 인메모리 스토리지가 도입되었다. DRAM의 특성상 가격이 비싸고 용량이 적으며, 정전으로부터 사용자 데이터를 안전하게 보존할 수가 없다. 작은 용량은 중복제거 기술을 통하여 해결하였으며, 정전이나 크래시로부터 데이터를 보호하기 위하여 이 논문에서는 데이터 손실 없이 지속가능한 인메모리 스토리지를위한 실시간 동기화 램 모듈을 제시한다. 이것은 램과 SSD를 결합하여 실시간에 램의 데이터를 SSD와 동기화를 시켜주어 정전으로부터 데이터를 안전하게 유지할 수 있게 한다. 이것을 리눅스 커널 모듈로 구현하였으며, 실제 데스크톱 워크로드를 이용한 성능평가에서, 제안하는 기술이 메모리만 사용하는 스토리지에 비해서 37%~41%의 성능저하가 있는 반면에, SSD보다는 1500~1800% 더 좋은 성능 향상을 보였다.

In the virtual desktop infrastructure (VDI), servers run virtual machines that provide virtual desktop environments to remote clients. The most important bottleneck in these servers is the storage system, thus some of virtual desktop infrastructure adopted an in-memory storage system that utilizes the main memory, DRAM, as the storage system for better performance. DRAM is high cost per bit and cannot protect data against a power-failure. In-memory VDI utilizes data deduplication schemes to mitigate the small capacity of DRAM. To safely retain data against a power failure or a crash, this paper proposes a durable and persistent in-memory storage, real-time synchronized RAM module, which combines RAM with SSD, synchronizes SSD with the contents of RAM in real-time, and can recover the data of RAM after a power-failure. This module was implemented as a Linux kernel module. In performance evaluations that use real desktop workloads, the proposed scheme is worse than a memory-only storage by 37%~41% but better than a SSD-only storage by 1500%~1800%.

기후변화의 원인으로 지목되고 있는 온실가스의 감축은 우리나라를 비롯한 세계 각국의 공통적인 과제라 할 수 있 다. 온실가스감축을 위해서는 인위적으로 배출되는 온실가스 중 가장 많은 비중을 차지하고 있는 이산화탄소를 감 축하여야 한다. 세계적으로도 이산화탄소의 대량 배출원인 화석에너지의 소비를 줄이고, 화석에너지를 대체할 수 있는 재생에너지를 사용하거나, 에너지의 사용을 줄이기 위하여 에너지효율성을 증대하려는 노력을 하고 있다. 그 러나 현재 사용되는 화석에너지를 가능한 줄이지 않으면서도 온실가스를 감축할 수 있는 가장 현실적인 방안은 이 산화탄소의 포집‧저장(CCS)이다. 유럽연합도 2050년까지 전세계 이산화탄소 배출량을 최소한 50%로 감축하기 위한 중요한 대안으로 CCS를 결정하 였고, CCS 기술의 적극적 활용에 필요한 제도적 기반을 구축하기 위하여 2009년 「CCS 지침(CCS-Richtlinie 2009/31/EG)」을 제정하였다. 이에 따라 독일을 포함한 유럽연합의 회원국은 이 지침을 자국의 법률로 이행하기 위 한 법률을 제정하여야 하는 상황에 놓이게 되었다. 독일도 에너지정책의 방향을 “에너지전환”으로 설정하였음에도 불구하고, 미래의 에너지믹스에서 화석에너지를 사용한 전기생산을 포기할 수 없음을 충분하게 인식하고 있다. 결 국 에너지를 안정적으로 공급하면서도 이산화탄소를 감축할 수 있는 유일한 해결방안으로 CCS를 고려할 수밖에 없다. 이러한 배경하에서 독일은 2012년 「CCS 지침」을 이행하는 「이산화탄소의 포집, 수송 및 영구적 저장을 위한 기술의 시범과 적용에 관한 법률」을 제정하여 온실가스의 감축에 기여할 수 있는 제도적 기반을 마련하였다. 독일의 「이산화탄소 저장법」은 총 7장 46개 조문으로 지하암반층에 이산화탄소를 저장하기 위한 기술의 연구, 시험 및 시범사업에 관하여 규정하고 있다. 특히, 동법률은 이산화탄소 저장소의 허가에 관한 사항을 주된 규율대 상으로 하고 있다. 이산화탄소의 포집이나 수송에 비하여 저장에 관한 기술력과 안전성이 충분하게 검증되지 않아 보다 철저한 규율이 필요했기 때문이다. 동법률은 「연방임미시온방지법」의 적용을 받는 이산화탄소 포집시설의 허가 이외에 이산화탄소의 수송허가, 피해배상책임과 피해배상보장 등에 관한 사항을 포함하고 있다. 독일은 CCS 법률의 제정을 통해 CCS 기술을 시험할 수 있는 기반을 구축하였다. 그러나 CCS 기술이 가지는 위험 성에 대한 문제는 더욱 부각되고 있어 수많은 문제해결에 대한 요구를 받고 있다. 기업은 이산화탄소 포집시설의 설치비용, 저장소의 운영비용, 사고발생에 대비한 손해배상비용 및 사후관리비용을 부담하게 됨으로써 CCS 기술 의 경제성에 대한 부담을 가지고 있다. 그럼에도 불구하고 CCS의 사회적 수용성을 증대하기 위하여 동법률은 CCS 관련 사업에 일반국민들이 참여할 수 있는 방안을 모색하고 있다. 이산화탄소의 감축은 우리나라도 피해갈 수 없는 당면한 국제적 의무라는 점에서 CCS 기술에 관한 입법적 방안을 제시한 독일의 CCS 법률이 주는 시사점은 큰 의 미가 있을 것이다.

The reduction of greenhouse gas which is caused by the climate change becomes an common challenge of the world including our country. To reduce the greenhouse gas, the proportion of carbon dioxide should be reduced, which amounts for most greenhouse gases. The world is making efforts to reduce fossil energy which is one of the causes of mass carbon dioxide, to use recycled energy which can replace the fossil energy and to reduce the use of energy. However, the most practical way to reduce the greenhouse gas is to capture and store the carbon dioxide(CSS). Even the European Union has decided CCS as a significant alternative to reduce the carbon dioxide emission at least 50% by 2050 and enacted 「CCS guideline (CCS-Richtlinie 2009/31/EG)」 to construct an institutional framework required to make positive utilization of CCS technology. Accordingly, the members of the European Union including Germany were forced to enact a law to implement this guideline. In spite that Germany has set their direction to “Energy transformation”, Germany was fully aware that they cannot give up to produce electricity using fossil energy in the future energy mix. Consequently, the only solution to reduce carbon dioxide while providing energy stably is CSS. Under this background, Germany has prepared an institutional framework that can contribute to reduction of greenhouse gases by enacting 「Act on the application and test of technology for capture, transportation and permanent storage」 to implement 「CCS guideline」 in 2012. 「Act on the CCS」 consists of total 7 chapters and 46 provisions specifying research, test and pilot business of technology to store carbon dioxide in the underground bedrock. Specially, the Act mainly regulates permission of storage of carbon dioxide. It is because that strict discipline is required as the technology and safety of storage were not proven compared to the capture and transportation of carbon dioxide. The Act includes provisions for transportation permission, damage liability and compensation guarantee of carbon dioxide except the capturing facility of carbon dioxide which is subject to the 「Federal Immission Act」. Germany constructed a framework to test CCS technology by enacting 「Act on the CCS」. As the risk of CCS technology comes into play, however, needs to solve this issue are increasing. The enterprises are supposed to have economic burden of CSS technology as they should bear the installation cost of capturing facility, operating cost of storage, damage liability for the accident and maintenance cost. Nevertheless, the Act is exploring a way for the public to participate in the CCS related project to increase the social acceptance of CCS. In the point that the reduction of carbon dioxide is an immediate international responsibility which our country cannot avoid, the implication of 「Act on the capture & storage of carbon dioxide」 which proposed legislative method to CSS technology would give significant meaning.

본 연구에서는 봄배추를 순간 건식 열처리와 차압 예냉 처리를 이용하여 전처리한 후에 MA 포장하였다. 포장 후 45일간 저장하면서 배추의 품질변화를 평가하였다. 배추의 호흡률은 차압 예냉처리구가 가장 낮게 측정되었으나, 순간 건식 열처리와 유의차가 보이지 않았다. 에틸렌 발생률은 순 간 건식 열처리구와 차압 예냉처리구 모두 대조구에 비해 낮은 발생률을 보여주고 있다. O2 및 CO2 기체 조성은 저 장기간에 따라 O2는 감소하고, CO2는 증가하며, 처리구별 유의차가 나타나지 않았다. 정선 손실률과 중량 감소율은 저 장기간이 길어짐에 따라 증가하는 경향을 보였으며, 순간 건 식 열처리구와 차압 예냉 처리구별 유의차는 나타나지 않았 으나, 대조구에 비해서는 유의적으로 낮은 손실률과 감소율 을 보여주고 있다. 전기전도도와 조직 특성, 경도 역시 처 리구별 유의차는 없었으나, 순간 건식 열처리구와 차압 예 냉처리구는 대조구에 비해 우수하게 나타났다. 결과적으로, 배추의 저장 특성 평가에서 순간 건식 열처리구가 차압 예 냉처리구와 유의적인 차이를 나타내지 않았고, 빠른 전처리 에 따른 경제적 효과도 있음으로써, 향후 순간 건식 열처리 가 배추의 장기저장 및 선도 유지를 위한 전처리 방법으로 활용 가능할 것으로 사료된다.

To evaluate the quality changes of Kimchi cabbage, it was packaged in the modified atmosphere (MA) after hot-air surface drying (HASD) or differential pressure precooling (PC) and stored at 0oC for 45 days. The respiration rate after PC was lower than that after HASD, but they were not significantly different. In both HASD and PC, the ethylene production rate was lower than that of the control group. The oxygen concentration decreased and the carbon dioxide concentration increased according to the storage period, but they did not show significant differences. The change of trimming loss and weight loss tended to increase as the storage period. No significant difference was shown between HASD and PC, but the corresponding result values of the treatment groups were significantly lower than those of the control group. There was no significant difference in electrolyte conductivity and texture between treatment groups, but HASD and PC were superior to the control group. These results suggest that HASD will be available on preprocessing method for long-term storage and freshness of Kimchi cabbage together with PC.

고온기 준고랭지에서 재배한 배추의 생육과 저장에 미치 는 영향을 구명하고자 하였다. ‘춘광’ 배추를 홍천에서 재 배 방법(노지 및 시설 재배)에 따른 생육 특성과 수확 후 저 장 시 특성을 조사하였다. 수확 후 생육은 시설 재배한 배 추가 생체중과 엽두께에서 노지 재배와 차이를 보였지만, 가식부인 결구 부분에서는 큰 차이를 보이지 않아, 재배 방 법에 따른 생육에 미치는 영향을 언급하기 어려웠다. 준고 랭지에서 재배한 ‘춘광’ 배추의 저장 시 생체중이나 정선 손 실률, 수분함량 등에서 유의 차이를 보였다. 동일 지역에서 시설과 노지로 재배를 달리한 경우 생체중량이나 정선 손 실률은 시설 재배가 변화폭이 더 커서 유의 차이를 보였으 며, 수분함량은 다소 낮아지는 것으로 나타났다. 본 연구를 통해 고온기 배추의 수확 후 저장 시 차이가 나타났음을 확인하고, 수확 전 요인이 저장까지 영향을 미치는 유기적 인 관계를 확인하였다. 농산물에 대한 생산성 위주의 연구 가 주류를 이루었으나, 앞으로는 생산뿐만 아니라 저장 동 안의 영향을 확인 할 필요가 있다.

This experiment was conducted to determine the effects of the pre- and post-harvest variable factors on the processed product of kimchi cabbage cultivated in semi-highland at summer time. Kimchi cabbage cultivar ‘Chun Gwang’ was grown in an open field and/or under a plastic greenhouse condition; it was stored at 0? after harvesting with low-density polyethylene (LDPE) film packaging. The pre-harvest characteristics growth parameters, fresh weight, head weight, no of leaves, leaf thickness, firmness, moisture content etc. were evaluated. The evaluated postharvest characteristics were fresh weight loss, appearance, trimming loss, SPAD value, moisture content and hue angle. The results show that the fresh weight and leaf thickness were higher in ‘Chun Gwang’ kimchi cabbages grown in the greenhouse than those in the field. However, the other evaluated factors were not affected by the type of cultural method. During the storage, the cabbage continued to decrease in fresh weight loss, trimming loss and moisture content. When compared to the kimchi cabbage showed significant difference in the fresh weight loss, trimming loss and moisture content during storage. It was confirmed that both cultural methods indoor- and outdoor did not show head growth parameters of ‘Chun Gwang’ kimchi cabbages on semi-high land at summer time. Although no difference in the growth before storage was observed, the evaluated characteristics like fresh weight loss etc. were influenced by cultural method as a pre-harvest factor. This study suggests that there were to be affected by pre-harvest factor during storage after harvest. In this study, an integrated management system combining relationship between processed agricultural products and their pre- and postharvest factors.

플래시 기반의 SSD(solid state drive)를 HDD(hard disk drive)의 2차 캐시로 사용하는 기술이 많이 연구되었 다. SSD를 이용한 캐시에 대한 캐시 교체 정책 및 관리에 관한 연구뿐만 아니라 프리페칭 연구도 필요하게 되었다. 본 논문은 SSD를 스토리지급 캐시로 사용하는 시스템을 위한 프리페칭 기술을 제시한다. 이 프리페칭 기술은 스토 리지급 크기의 캐시에 맞게 대규모의 프리페칭이며, 단기적인 프리페칭은 1차 캐시인 주메모리에서 수행되므로 장 기적 스케줄링을 기반한 프리페칭이며, 기존 프리페칭은 읽기만을 고려하였지만, 지속 가능한 SSD 캐시를 위해 쓰 기 요청도 고려한 프리페칭이다. 어떤 사용자의 14일간의 입출력에서, 64GB 용량의 SSD에 프리페칭 용량이 4GiB일 때에, 2.3%에서 17.8%의 캐시 적중률 향상을 보였다. 본 기술은 구현이 간단하여 스토리지급 캐시 시스 템에 쉽게 적용할 수 있다.

Solid state drive (SSD) cache technologies that are used as a second-tier cache between the main memory and hard disk drive (HDD) have been widely studied. The SSD cache requires a new prefetching scheme as well as cache replacement algorithms. This paper presents a prefetching scheme for a storage-class cache using SSD. This prefetching scheme is designed for the storage-class cache and based on a long-term scheduling in contrast to the short-term prefetching in the main memory. Traditional prefetching algorithms just consider only read, but the presented prefetching scheme considers both read and write. An experimental evaluation shows 2.3% to 17.8% of hit rate with a 64GB of SSD and the 4GiB of prefetching size using an I/O trace of 14 days. The proposed prefetching scheme showed significant improvement of cache hit rate and can be easily implemented in storage-class cache systems.

This study was conducted to suggest effective storage methods for the use spent mushroom (Flammulina velutipes) substrates (SMS) as animal feed. SMS was storage by deep stacking, composting and vinyl mulching after treated with 1% microbes and 0.5% formic acid. During the storage periods, all of the treatment was covered with hyphae of mushroom. The external change of SMS was shown that the storage of SMS can be improved by anaerobic condition and 1% microbial treatment. The comparatively high temperature, pH and total bacterial number was shown in the SMS treated without microbes and formic acid by composting.

In this study, temperature and relative humidity during growth of fruit body were applied to oyster mushroom (Pleurotus ostrestus) to elucidate the prolongation effect of storage. Although there were not big differences among conditions of cultivation, weight loss and change of pileus color were slight increased and hardness and springness of fruit body were little decreased with storage period. When whole mushrooms (250~300g) were packaged with wrap and stored at 4±1℃, the shelf life of the oyster mushrooms were cultivated at 16℃ and at 13℃ was 18 day and 24days, respectively. Therefore, it was elucidated that the treatment of low-temperature at the step of fruit body development affected extension of shelf life in oyster mushroom.

연구목적: 본 논문에서는 기후변화로 기존 도심지 침수 발생이 증가하는 현 상황에서 공동주택 단지에 소규모 우수저류시설을 계획하였을 때 기존 하류부 도심지 침수량 증가율과 기존 도심지 침수량 저감 정도를 분석하고자 한다. 연구방법: 미국환경보호청 SWMM 모델을 활용해서 대규모 하수도 모델을 구축하고 시뮬레이션을 통해 하류부 기존 도심지 침수영향을 분석하였다. 구축한 모델은 개발지구, 하 류부 기존 도심지, 우수를 방류하는 하천유역 전체를 포함하였다. 연구결과: 대규모 개발행위 시 연구 대상지역에서 공동주택 블록별로 최소 우수저류조 용량을 산정하여 시뮬레이션한 결과, 하류부 기존 도심지에서 방재성능목표강우량 1시간 기준 4,893㎥, 2시간 기준 25,815㎥, 3시간 기준 55,528㎥의 침 수량을 저감할 수 있을 것으로 나타났다. 결론: 본 연구와 같이 하류부 기존 도심지까지 고려한 대규모 침수 시뮬레이션을 실시하였을 때 하류부 도심지 침수가 크게 증가하는 것을 알 수 있고, 개발전 공동주 택 단지 블록별로 필요한 우수저류조 용량을 계획하고 개발시 비용 지원 등으로 우수저류조 건설을 권 장한다면 하류부 기존 도심지 홍수 부담을 감소시킬 수 있다.

Purpose: In this paper, we would like to analyze the growth rate of existing urban immersion in the downstream during large-scale urban development and the degree of reduction in existing urban immersion in the downstream when small excellent storage facilities are planned in apartment complexes. Method: A large-scale sewage model was built using the SWMM model of the U.S. Environmental Protection Agency, and the impact of flooding in existing downtown areas downstream was analyzed through simulation. The built model included the development zone, the existing downtown area downstream, and the entire river basin that discharges rainwater. Result: As a result of calculating and simulating the minimum excellent reservoir capacity for each apartment block in the study target area, it was found that the immersion of 4,893㎥ based on one hour, 25,815㎥ based on two hours, and 55,528㎥ based on three hours in the downstream urban area. Conclusion: As in this study, large-scale flooding simulation considering the existing downtown area in the downstream shows a significant increase in flooding in the downstream, and if excellent reservoir capacity is planned for each apartment block before development and the construction of excellent reservoirs is recommended.

Effect of packaging and storage methods for enhancing the shelf life and improving the postharvest quality of lettuce (Lactuca sativa L.) was studied during high temperature period. Lettuces were packed using four packaging and storage types: (A) plastic box container (control); (B) plastic box container covered with high density polyethylene (HDPE) film; (C) plastic box container with lettuce wrapped in linear low-density polyethylene (LLD-PE) film; and (D) plastic box container with lettuce with its stem. The quality parameters, such as fresh weight loss, SPAD value, and appearance of lettuce were investigated. The lettuce wrapped with LLD-PE film inside the plastic box container showed the lowest weight loss, highest SPAD value and best appearance compared to those exposed to the other packaging and storage methods during the three-week storage at 2oC. The results indicate that the marketability of lettuce can be optimized if proper packaging and storing is adopted. Prolonging the freshness even on low temperature storage will increase the potential of its sale ability in the domestic market even during summer season.

The research was aimed to improve pre-harvest methods to maintain marketability in postharvest coniferous lettuce. Non-woven pots or plug plates were used to generate seedlings. No difference was found in growth characteristics of lettuce grown in non-woven pots vs plug plates. Since, seedling method with non-woven pots was convenient, lettuce harvested from non-woven pots used for water dipping treatment. The quality parameters, such as fresh weight loss, SPAD value, and appearance of lettuce were investigated after harvest. The lettuce with dipping treatment inside the plastic box container showed lower weight loss, higher SPAD value and better appearance compared to those exposed to the control (non-packaging) during the storage at 2oC. The treated plant showed higher SPAD and hue angle values 21.9 and 113.8o, respectively, compared to that of 18.8 and 108.3o, in non-treated plants. Therefore, it seems that the water dipping treatment is effective for storage method to maintain freshness of the lettuce. We showed the non-woven pot growing as a convenient seedling method for packaging treatment. Further studies will be continued to improve freshness postharvest of other horticultural crops.

Winter mushroom was monitored to investigate the influence of storage temperature on its quality during the storage and distribution phase. In measuring its quality, the contents of saccharides were quantified with its fruiting bodies using HPLC. Although it has been known to be difficult to separate saccharide isomers, our results indicated that Grace Prevail carbohydrate ES 5μcolumn was the best in the separation to analyze the saccharide out of six columns used in this study. In our results, xylose was the main component of saccharide in the fruiting body of winter mushroom(White line mushroom:47.68㎎/g, brown line mushroom: 63.28㎎/g). In long-term storage, the total amount of saccharide tended to increase, but trehalose content of the disaccharide decreased. In comparison with the paramount amount of lactose and myo-inositol contents in long-term storage at 4℃, lactose wasn’t detected when stored at -1℃.