• 물과 미래
• /
• 제9권2호
• /
• pp.67-75
• /
• 1976

With 9 existng reservoirs selected in the Sab-Gyo River Basin, the sedimentation of the reservoirs has been calculated by comparing the present capacity with the original value, which revealed its reduced reservoirs capacity. The reservoirs has a total drainage area of 6,792 ha, with a total capacity of 1,204.09 ha-m, and are short of water supply due to reduction of reservoirs capacity. Annual sedimention in the reservcire is relation to the drainage area, the mean of annual rain fall, and the slop of drainage area. The results of obtained from the investigation are summarized as follow; (1) A sediment deposition rate is very high, being about $9.19{m}^3/ha$ of drainage area, and resulting in the average decrease of reservoir capacity by 19.1%. This high rate of deposition could be mainly attributed to the serve denvdation of forests due to disor derly cuttings of tree. (2) An average unit storage of 415.8mm as the time of initial construation is decreesed to 315.59mm at present, as resultting, we could'nt supply water at 566.24ha. (3) A sediment deposition rate as a relation to the capacity of unit drainage area is as follow; $Qs=1.43 (c/a)^{0.531}$ (4) A sediment deposition rate as a relation to the mean of annval rainfall is as follow; $Qs=672.61 p^{0.024}$ (5) A sediment deposition rate as a relation to the mean slop of drainage area is follow; $Qs=267.21 S^{0.597}$

• 상하수도학회지
• /
• 제22권2호
• /
• pp.233-238
• /
• 2008

Recently, rainwater harvesting facilities have increasingly constructed mainly in elementary schools and government buildings. Nevertheless, few methods are available for efficient planning and design of rainwater harvesting facilities by considering the weather conditions and purpose of rainwater management in each site, which may lead to a construction of uneconomic facilities. The current method estimates the size of rainwater storage tank by multiplying the size of building or plottage with a certain ratio and has many limitations. In this study, we first developed a method for planning and design of rainwater storage facilities using $Rainstock^{TM}$ model, which is based on mass balance, and economic analysis. Then, the model was applied for the design of a rainwater harvesting facility in a building with the catchment area of $1,000m^2$. The model calculation indicated that the economic feasibility of rainwater harvesting depends on not only the size of storage tank but also the water usage rate. When the water usage rate is $1m^3/day$, the rainwater harvesting facility is not cost-effective regardless of the size of the storage tank. With increasing the water usage rate, the economical efficiency of the facility was improved for a specific size of the storage tank. Based on the model calculation, the optimum tank sizes for $5m^3/day$ and $10m^3/day$ of water usage rates were $24m^3$ and $57m^3$, respectively. It is expected that the model is useful for optimization of rainwater storage facilities in planning and designing steps.

• 한국축산식품학회지
• /
• 제18권1호
• /
• pp.35-41
• /
• 1998

The objective of this study was to examine the changes of physical properties by additions of different kinds of stabilizers milk proteins concentration, when stored at 4$^{\circ}C$ or 20$^{\circ}C$ for yoghurt. the results were summarized as follows: 1. Addition of 2% carboxyl methyl cellulose and carrageenan, gelation 0.4%, pectin and starch 0.6%, and carrageenan & pectin 0.8% in the manufacture of yoghurt increased the viscosity, water-holding capacity and protein hydration of yoghurt. 2. Addition of 3% skim milk powder, Ca-caseinate or Na-caseinate 0.6% increased the viscosity, water-holding capacity and protein hydration of yoghurt. 3. Twenty five percent of evaporation of milk promoted to build up the optimal structure of the micelles of yoghurt and improved viscosity, water-holding capacity and protein hydration of yoghurt. 4. Addition of stabilizers to yoghurt showed an increase of viscosity, water-holding capacity and protein hydration when compared with non-addition of stabilizers to yoghurt at 4$^{\circ}C$, 20$^{\circ}C$ storage for 12hrs, 96hrs followed by the decrease of it.

• 한국환경과학회지
• /
• 제11권12호
• /
• pp.1217-1226
• /
• 2002

This study aims at the effective estimation of water supply capacity of small scale reservoir and the proposal of the data which is necessary to establish the water resources management plan of down stream area of the reservoir in the future by comparison and examination about reservoir operation technique for the security of agricultural water in small scale reservoir. The result of flow calculation by Tank model is used for the input data as the inflow data which is needed for the analysis of water supply capacity. Stochastic method, simulation method, and optimization method are used to examine the water supply capacity, and water security amount is compared with each method. From the analyses of water supply capacities by each method, slightly different results are shown in spite of the effort to compare them equally using input data such as inflow data under equal conditions, and the comparison of water supply capacities by each method are as follows; linear planning method, simulation method, and transition probability matrix method in the order of amount from the largest. It is thought that the simulation method in which comparatively reasonable application of the inflow data is possible and is simulated in successive time series dam operation of the three methods used in this study thus, simulation model is proper to estimate the water supply capacity of agricultural small scale reservoir. And it is judged that the heightening of efficiency of water resources utilization according to the development of downstream area of dam may be possible using the upward readjusted water supply amount of $55.18{\tiems}10^6ton$ and $63.7{\times}10^6ton$ at 95% and 90% supply reliability respectively which are above the planning water supply amount of $50.0{\times}10^6$ton when the simulation method is introduced as the standard.

• 방사선산업학회지
• /
• 제17권3호
• /
• pp.309-320
• /
• 2023

A multi-purpose canister (MPC) was developed for the purpose of transportation, storage and disposal of spent nuclear fuel (SNF) and has the advantage of minimizing repackaging between management stages of SNF. Considering the typical rock characteristics in Korea, a disposal canister is expected to contain 4 assemblies of Pressurized water reactor (PWR) SNF. The capacity of the MPC should be similarly designed with the disposal canister. However, the MPC with four SNF assemblies is expected to be less efficient in transporting and storing compared to a large-capacity canister. Therefore, a preliminary concept was derived for an auxiliary equipment that can transport and store multiple MPCs in a large overpack. A previously derived concept from US was thoroughly reviewed, and the preliminary concept was revised considering domestic situations including crane capacity and others. In addition, the safety of the normal transportation and storage of the MPC placed in transportation and storage overpack was evaluated with the auxiliary equipment.

• 한국자원식물학회:학술대회논문집
• /
• 한국자원식물학회 2019년도 추계학술대회
• /
• pp.102-102
• /
• 2019

Soybean curd residue (SCR), known as a major waste product of soybean processing, is the water-insoluble fraction which is removed by filtration during soymilk production. For these reasons, SCR was usually considered as food waste. SCR might have a good potential as a functional food material, value-added processing and utilization. SCR contains high-quality protein and consists of a good source of nutrients, including protein, oil, dietary fiber, minerals, along with un-specified monosaccharides and oligosaccharides. Also, SCR might be a potential source of low cost protein for human consumption. However, SCR could be a source of bacterial contamination when during food processing. This study was aimed to investigate antibacterial capacity of natural product through detecting relationship between SCR and microbial. We isolated five bacterial strains from SCR and elucidated antibacterial activity of nature medicines to extend storage capacity of food made with SCR. Thus, the extract which showed antibacterial effects in Corynebacterium calloonae and Raoultella amithinolytica is a combination of seven kinds of extracts: Glycyrrhiza uralensis, Cudrania tricuspidata, Salvia miltiorrhiza Bunge, blueberry, Acorus gramineus, Ginkgo biloba L., Camellia sinensis. This study suggested that antibacterial activities of natural medicines could be used for extension of storage capacity in SCR-contained food.

• Journal of Animal Science and Technology
• /
• 제46권6호
• /
• pp.1023-1030
• /
• 2004

본 연구는 양념돈육에 분자량 약 120 kDa의 키토산을 0.05 에 서 1. 0 %까지 첨가하여， 양념돈육의 보존성 및 품질에 미치는 영향에 대해 알아보기 위하여 생균수， 지질 산화도， pH, 색도와 보수력을 측정하였다. 저장기간이 경과함에 따라 양념돈육의 생균수는 증가하였으나， 키토산을 첨가한 양념돈육은 첨가하지 않은 것에 비해 생균수가 효과적으로 억제되었으며 키토산을 0.10 %. 0.50 %, 1.00 % 비율로 첨가했을 때는 저장 10일 동안 저장성이 상당히 유지되었다. 또한 키토산의 첨가량이 증가함에 따라 저장성도 향상되었다. 키토산을 첨가하지 않은 양념돈육 은 저장기간이 경과함에 따라 TBARS의 함량이 점차 증가하였으며， 키토산을 첨가한 경우는 첨가하지 않은 것에 비해 TBARS의 함량이 대체로 낮게 나타나 지질 산화를 억제하는 것으로 나타났다. 또한 키토산의 첨가 농도가 증가할수록 지질산화 억제효과가 큰 것으로 나타났다. 양념돈육의 pH 변화를 측정한 결과 키토산을 첨가한 것이 pH가 낮았으나 저장기간 동안 거의 일정하게 유지되었다. 저장기간에 따른 양념 돈육의 색의 변화를 살펴보면 키토산을 첨가한 구의 명도.(L^*)， 적색도(a^*) 황색도(b^*)가 키토산을 첨가하지 않은 것에 비해 모두 높은 수치를 나타냈다. 보수력은 키토산을 첨가한 양념돈육에 있어 초기에는 낮았으나 저장 10일까지 보수력 이 비교적 안정한 것으로 나타났다.

• 한국산림과학회지
• /
• 제83권4호
• /
• pp.473-479
• /
• 1994

본 연구는 임지의 수저류능력을 토양공극 구분에 의한 실제 이용가능수량으로 평가하여 지속적인 수자원의 확보를 위한 기초자료를 제공할 목적으로 수행하였으며, 그 결과는 다음과 같다. 1. 조공극은 임지>임간나지>초지의 순으로 높았고, 토심이 깊을수록 전공극, 조공극, 이용가능수량은 감소하는 반면, 세공극은 점차 증가하는 것으로 나타났다. 2. 토양의 공극과 이학적 특성은 지피상태별로 표층(0~20cm)에서 고도의 유의차를 보이는 반면, 토심 20~40cm와 토심 40~60cm에서는 큰 차이가 없었다. 한편, 동일 시험구에서 표층(0~20cm)과 토심 20~40cm와는 큰 차이를 보이나 토심 20~40cm와 토심 40~60cm와는 큰 차이가 없었다. 3. 전 시험구에서 이용가능수량은 조공극과 고도의 상관관계를 나타냈다. 4. 조공극량과 토심을 이용하여 나타낸 이용가능수량으로 각 지피상태별 수저류량 추정모델을 산출할 수 있었다.

• Food Science and Biotechnology
• /
• 제17권3호
• /
• pp.534-539
• /
• 2008

This study investigated the effects of pretreatment and storage conditions on the properties of stored chestnuts. Effects on chestnuts of refrigerated storage (RNT) and frozen storage (FNT) with no pretreatment, frozen storage after oxalic acid treatment without blanching (FON) and with blanching (FOB) were examined. Water binding capacity, swelling power, solubility, and viscosity of the starch produced from RNT, FNT, and FON were similar to those of the starch produced from control (CON). FOB showed significant differences in these properties from CON. Textural properties of starch gels prepared from stored chestnuts except FOB also were very similar to those of CON starch gels. The sensory characteristics of steamed FON and FNT were similar to those of steamed CON except in brown color and hardness. Steamed FNT tended to have higher brown color and lower hardness than steamed FON. Steamed RNT showed significant differences in all the sensory properties except in hardness and cooked chestnut flavor. Steamed FOB was significantly higher than steamed CON in water release and off-flavor. Among the storage conditions examined, frozen storage with oxalic acid treatment is recommended for the long-term storage of chestnuts.

• 터널과지하공간
• /
• 제22권1호
• /
• pp.1-11
• /
• 2012

열에너지 저장은 고온 또는 저온의 열에너지를 임시 저장하는 것으로서 에너지 수요와 공급 사이의 불균형을 줄일 수 있고, 이를 통해 에너지를 절약하고 에너지 이용효율을 향상시킬 수 있다. 특히 간헐적으로 에너지를 생산하는 신재생에너지의 경우 에너지 저장 장치와의 조합은 필수적이다. 또한 지하 암반의 낮은 열전도도와 높은 열용량을 이용하여 지하에 열에너지를 저장하는 경우 열손실을 최소화하여 추가적인 효율 향상이 기대된다. 본 고에서는 지하 열에너지 저장 기술을 조사 분석하고 스웨덴에 암반공동내 열에너지 저장 사례를 소개하였다.