• 방사선산업학회지
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• 제9권2호
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• pp.57-62
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• 2015

In this study, we fabricated effect of storage conditions on graft of polypropylene (PP) non-woven fabric induced by electron beam. The electron beam irradiations on PP non-woven fabric were carried out over a range of irradiation doses from 25 to 100 kGy to make free radicals on fabric surface. The radical measurement was established by electron spin resonance (ESR) for confirming the changes of the alkyl radical and peroxy radical according to effect of storage time, storage temperature and atmosphere. It was observed that the free radicals were increased with irradiation dose and decreased with storage time due to the continuous oxidation. However, the radical extinction was significantly delayed due to reduced mobility of radicals at extremely low temperature. The degree of graft based on the analysis of ESR was investigated. The conditions of graft reaction were set at a temperature: $60^{\circ}C$, reaction time: 6 hours and styrene monomer concentration: 20 wt%.

• 한국가금학회지
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• 제33권1호
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• pp.7-14
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• 2006

함기 포장과 진공 포장이 냉장 저장 중 오리고기의 육색, 지방 산화 및 지방산 조성에 미치는 영향을 조사하였다. pH는 가슴육이 다리육에 비해 낮았으며, 냉장 저장 중 가슴육이 다리육에 비해 육색의 변화가 크게 나타났다. 다리육의 조지방 함량이 가슴육에 비해 약2배 정도 높았으며, 저장 3일 째부터 전단가가 낮아졌다. 함기 포장은 진공 포장에 비해 냉장저장 중 다리육의 지방 산화를 촉진하는 것으로 나타났으며, 지방 산화는 palmitic acid 함량의 감소와 linoleic acid 함량의 증가와 관련이 있는 것으로 나타났다 결과적으로 오리고기의 장기적인 냉장 유통을 위해서는 함기 포장보다 진공 포장을 하는 것이 바람직할 것으로 사료된다.

• 대한산업공학회지
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• 제41권5호
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• pp.414-424
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• 2015

In this research, we consider a smart grid network of electricity with multiple consumers connected to a monopolistic provider. Each consumer can be informed the real time price changes through the smart meter and updates his consumption schedule to minimize the energy consumption expenditures by which the required power demand should be satisfied under the given real time pricing scheme. This real-time decision making problem has been recently studied through game-theoretic approach. The present paper contributes to the existing literature by incorporating storage appliance into the set of available household appliances which has somewhat distinctive functions compared to other types of appliances and would be regarded to play a significant role in energy consumption scheduling for the future smart grid. We propose a game-theoretic algorithm which could draw the optimal energy consumption scheduling for each household appliances including storage. Results on simulation data showed that the storage contributed to increase the efficiency of energy consumption pattern in the viewpoint of not only individual consumer but also whole system.

• 한국경영과학회지
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• 제31권3호
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• pp.11-25
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• 2006

Space may be a scarce resource in manufacturing shops, warehouses, freight terminals, and container terminals. This Paper discusses how to locate temporary storage Inventories In limited storage areas. A typical inventory is delivered from the location of the preceding process to the storage area and stored In the storage area during the certain period of time. And it may be relocated from the storage position to another. Finally. it is delivered from the final storage area to the location of the next process. Because this logistic process for an inventory requires handling activities, transportation activities, and storage spaces, the limitation in capacities of handling equipment, transportation equipment, and storage space must be considered when allocating spaces to the inventory. This problem Is modeled as a multicommodity minimal cost flow problem. And a heuristic algorithm for the Problem is proposed. Numerical experiments are presented to validate the mathematical model and the heuristic algorithm.

• 한국축산시설환경학회지
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• 제18권sup호
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• pp.29-34
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• 2012

본 연구는 돈사 슬러리 피트와 유사한 형태의 모형의 아크릴 반응조에서 분뇨를 6주간 배양하면서 2주 간격으로 악취물질의 농도를 측정하기 위해 수행되었다. 1. 분뇨를 6주간 저장하는 동안 2주 간격으로 단쇄지방산의 농도를 측정하였을 때 시간이 경과함에 따라 뚜렷하게 감소하였으며(p<0.05), 이성체지방산의 농도는 저장 4주 이후 크게 감소되었다(p<0.05). 2. 분뇨 저장기간별 페놀류 농도는 0, 2, 4, 6주에 각각 68.27, 47.69, 26.08, 8.84 ppm으로 시간 경과와 함께 크게 감소되었다(p<0.05). 3. 그러나 분뇨를 6주간 저장하는 동안 인돌류 농도는 저장 4주부터 증가되었다(p<0.05).

• 조명전기설비학회논문지
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• 제28권9호
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• pp.89-98
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• 2014

A diagnostic fluoroscopy X-ray system uses a 32kW or greater X-ray generator for obtaining real-time moving images and high-resolution images. Fluoroscopy X-ray systems have to use a high-capacity AC power source to perform long-time low-power fluoroscopy and short-time high-power spot exposure. In this paper, we propose a hybrid type X-ray generator for fluoroscopy X-ray system which can perform fluoroscopy and spot exposure with a low-capacity AC power source and an energy storage device. The characteristics of energy storage devices are compared and each energy storage device is modelled to equivalent circuit. And the characteristics of available energy are analyzed as a function of output voltage and power. A 32kW class hybrid X-ray generator with EDLC as an energy storage device for fluoroscopy X-ray system was constructed, and its validity was verified by means of simulations and experiments.

• 한국전자통신학회논문지
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• 제15권4호
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• pp.753-758
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• 2020

본 논문에서는 개발된 수직교반히터를 시설하우스에 적용하고, 그 외 시설물(순환팬, 환기팬, 개폐 모터를 이용한 창문, 천장, 제습)을 통합적으로 제어할 수 있는 제어 시스템을 개발하고자 한다. 이를 통해 작물의 재배 효율을 올리고 무가온 저장고나 저장창고 등이 보유한 수확물의 보관 환경을 개선하여 저장 기간 및 신선도를 증대시키고자 한다. 또한 ICT 모니터링 기술을 추가하여 사용자가 RTC(: Real Time Control)로 재배 및 저장 환경의 변화에 따라 문제가 생겼을 시에 손쉽게 해결할 수 있도록 하고자 한다.

• 한국식품과학회지
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• 제29권1호
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• pp.115-119
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• 1997

우유와 두유에 Bifidobacterium을 혼합한 후 $4^{\circ}C$에서 한 달(30 days)동안 보관했을 때, 저장기간에 따라 살아있는 Bifidobacterium을 함유한 우유와 두유의 최상 조건을 알아보고자 하였다. 이를 위하여 pH, 산도, glucose함량, 생균수를 관찰하고, 또한 관능검사(10 days)를 실시하였다. Bifidobacterium을 시료에 혼합한 후 $4^{\circ}C$에서 한 달(30 days)동안 보관시 적정산도 증가율은 탈지분유, 저지방유, 저온 처리유, 고온 처리유, 그리고 두유 순으로 나타났으며 이에 반해 모든 종류의 우유와 두유에서 pH의 변화는 큰 차이가 없었다. 또한 이들 군에서 glucose함량 변화를 측정하였을 때, $0{\sim}10$일, $10{\sim}20$일, $20{\sim}30$일 사이에서 각각 두유, 저온 처리유, 고온 처리유가 높은 함량을 나타냈다. Bifidobacterium을 첨가한 우유 및 두유의 관능검사 결과는 두유의 10일 보관 전 기간동안 2일과 4일 경과시 풍미에서 가장 높은 점수를 받았으며, 우유에서는 기간이 길어질수록 좋지 않음을 알 수 있었다. 그러나 우유와 두유 모두에서 4일 경과시 다른 저장 기간에서보다 높은 기호도를 나타냈다.

• 한국군사과학기술학회지
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• 제15권2호
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• pp.215-223
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• 2012

A violet smoke hand grenade(KM18) is used to generate signals. The grenade is considered to fail when its smoke emission time is longer than the specified one so that its smoke concentration becomes lighter. Accelerated degradation test for the grenade was performed, and then failure in smoke emission time was reproduced from the test. Stress for the degradation test was selected as temperature/humidity from the pre-test results. Degraded data of emission time from the accelerated test were analyzed through applying a distibution-based degradation model. Then, Peck Model was applied to predict the storage life under field conditions. In addition, the predicted storage life was compared with that of ASRP(Ammunition Stockpile Reliability Program).

• Management Science and Financial Engineering
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• 제12권1호
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• pp.79-94
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• 2006

In this paper, we readdress a layout design problem, PTL[3], for determining an optimal 3-class-based dedicated linear storage layout in a class of unit load storage systems. Based on some fundamental properties derived, we provide a converging exact algorithm with O(n[logn]), which is more efficient than that of Yang and Kim [8] and can be applied to PTL[K] with $K{\ge}4$ in order to reduce computational execution time. In addition, we prove that the necessary condition suggested by them is also a sufficient condition to PTL[3].