• 한국식품과학회지
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• 제30권6호
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• pp.1307-1311
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• 1998

절임배추의 장기저장에 적합한 포장방법을 연구하기 위하여 해남산 월동배추를 절여서 20 kg씩 대형으로 포장하여 $0^{\circ}C$ 저온저장고에서 8주간 저장하면서 절임배추의 염도, pH, 환원당함량, 총균수, 유산균수의 변화를 조사하였다. 그 결과 플라스틱 상자에 포장하여 덮개를 덮은 것이 가장 빠르게 변질되었고, LDPE로 포장한 것이 품질이 가장 잘 유지되었으며, HDPE 포장은 LDPE보다 약간 빠르게 변화하였는데, 모든 포장구에서 즙액에 잠긴 부분은 품질이 6주이상 양호하였으나 잠기지 않은 부분이 초기부터 빠르게 변질되었으므로, 절임배추는 즙액에 잠기도록 포장하는 것이 품질유지에 아주 중요하였다.

• 한국습지학회지
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• 제16권1호
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• pp.33-39
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• 2014

본 연구의 목적은 건물지붕에서 흘러내리는 빗물의 효용을 극대화하기 위해 시간에 따른 지붕 빗물의 성상을 분석하고, 소독하지 않은 저장 빗물과 염소 소독된 저장 빗물의 성상변화를 추적하는데 있다. 이를 위하여, 저장 빗물의 COD, T-N, T-P, 장내미생물, 일반미생물의 시간에 따른 변화를 염소 주입 농도별로 분석하였다. 소독된 저장 빗물의 경우 장내 미생물 및 일반 미생물은 염소 주입 후 2주 이내에 99% 저감을 확인하였다. 따라서, 지붕 빗물을 장기 보관할 경우, 소독 후 보관하는 것이 저장 빗물의 수질 유지에 도움을 주며 장기적으로 여러 용도에 사용하기 적합할 것으로 판단된다.

• 한국수소및신에너지학회논문집
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• 제33권3호
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• pp.247-254
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• 2022

Slush hydrogen containing liquid and solid hydrogen is expected to achieve zero boil-off by suppressing boil-off gas because heat of fusion for solid absorbe the heat ingress from atmosphere. In this paper, quantitative analysis on storage cost considering specific energy consumption between 1,000 m³ class liquid hydrogen storage system with re-liquefaction and slush hydrogen storage system during equivalent zero boil off period. Even though approximately 50% of total storage capacity should be converted into solid phase during the initial cargo bunkering, total energy consumption to convert into slush hydrogen is relatively 25% less than re-liquefaction energy for boil off hydrogen during zero boil off period. That's because energy consumption of slush phase change take up only 1.8% of liquefaction energy. moreover, annual revenue requirement including CAPEX, OPEX and electric cost for slush hydrogen storage could be more reduced approximately 32.5% than those of liquid hydrogen storage and specific energy storage cost ($/kg-H₂) could also be lowered by about 41.7% compared with liquid hydrogen storage.

• 한국연초학회지
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• 제8권1호
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• pp.13-21
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• 1986

The fragility, which express the fineness index, increased linearly with the moisture content for various tobacco shreds and showed a high correlation to the moisture content. Then, fineness index (FIs) at reference moisture content(l2.5%) was obtained by following equation. FIs=FIm+A(12.5-Mm) A" denote the gradient of simple linear regression equation between the fineness index and moisture content. FIm; the fineness index measured at the standard moisture content(12.5%). The characteristics of fragility concerning with some kinds of tobacco raw materials, stalk position, moisture content and storaged time were investigated. The following results were obtained. 1. The moisture content range of less fragile of tobacco raw material was from 16% to 20%. whereas the rolled process sheet tobacco was from 12% to 16%. 2. The Bright yellow and the paper process sheet tobacco were less fragile than that of the other tobacco raw materials. 3. The leaves were more distant from middle stalk position, and its become more fragile. 4. Physical properties of the storaged tobacco leaves were determined as a function of each storageunction of each storage time. The long-term storaged leaves(more than 3 years) were slightly lighter weight, more fragility and lower equilbrium moisture content than thos of the mid-term storaged leaves.(less than 3 years). 5. Contents of chemical component of the storaged leaves were determined every storage time. The long-term storaged leaves were slightly lower content of nicotine and chlorine than those of mid-term storaged leaves, but contents of crude fiber, total ash and calcium were increased significantly.

• 인지과학
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• 제7권3호
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• pp.7-36
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• 1996

본 논문에서는 인간을 대상으로 한 신경심리학적 연구결과들을 중심으로 기억의 뇌생리적 기초에 관하여 지금까지 알려진 바를 개관하고자 하였다. 현재 인지심리학자들은 기억이 하나의 단일한 체계가 아니라 여러가지 독자적인 하위체계들로 구분된다고 생각한다. 이러한 다중기억체계의 관점을 따라 본 논문에서는 뇌의 어느부위가 손상될때 어떤 종류의 기억에 장애가 생기는가,그리고 뇌영상 기법을 사용하요 특정 기억과제를 수행하는 도중에 뇌의 어느 부위가 그 제시방식에 따라 약간씩 다르지만 대개 후두염,두정엽,그리고 측두엽의 경계선을 중심으로 한 비교적 넓은 부위가 중요한 것으로 보인다. 장기기억의 경우,그 한 하위체계인 암묵기억은 하나의 단일한 기억체계가 아니어서 어떤 학습과제가 사용되는가에 다라 관련되는 부위가 많이 달라진다. 반면에 외현기억의 형성(즉,응고화)에는 내측측두엽이 결정적인 역할을 한다는 사실을 잘 알려져 있다. 일화기억과 의미기억의 저장 그리고/또는 인출에는 측두피질과 전두전피질이 중요한 역할을 하는것으로 보인다. 끝으로,장기기억의 저장장소에 관한 최근의 견해가 소개되었다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 A
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• pp.149-151
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• 2005

A new approach considering CO2 air pollution constraints in the long-term generation mix is proposed under uncertain circumstances. A characteristic feature of the presented approach in this paper is what effects give the air pollution constraints in long term best generation mix. Best generation mix problem is formulated by linear programming with fuel and construction cost minimization with load growth, reliability (reserve margin rate) and air pollutionconstraints. The proposed method accommodates the operation of pumped-storage generator. It was assumed in this study that the construction planning of the hydro power plants is given separately from the other generation plans. The effectiveness of the proposed approach is demonstrated by applying to the best generation mix problem of KEPCO-system, which contains nuclear, coal, LNG, oil and pumped-storage hydro plant multi-years.

• 대한전기학회논문지
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• 제34권8호
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• pp.308-316
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• 1985

This paper proposes an analytic tool for long-term generation expansion planning based on the maximum principle. Many research works have been performed in the field of generation expansion planning. But few works can be found with the maxinmum principle. A recently published one worked by professor Young Moon Park et al. shows remarkable improvements in modeling and computation. But this modeling allows only thermal units. This paper has extended Professor Park's model so that the optimal pumped-storage operation is taken into account. So the ability for practical application is enhanced. In addition, the analytic supply-shortage cost function is included. The maximum principle is solved by gradient search due to its simplicity. Every iteration is treated as if mathematical programming such that all controls from the initial to the terminal time are manipulated within the same plane. Proposed methodology is tested in a real scale power system and the simulation results are compared with other available package. Capability of proposed method is fully demonstrated. It is expected that the proposed method can be served as a powerful analytic tool for long-term generation expansion planning.

• Journal of Advanced Marine Engineering and Technology
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• 제39권4호
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• pp.483-488
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• 2015

본 논문에서는 엔진유지관리 개선을 위해 Web 기반 선박엔진성능분석용 장기모니터링시스템을 구현하고자 한다. 이 시스템은 시뮬레이터, 다채널 A/D 변환기가 내장된 감시모듈, 모니터링 컴퓨터, 네트워크저장기(NAS), RS485 및 무선인터넷 통신시스템으로 구성된다. 기존 제품은 각 엔진마다 압력센서를 설치하고 이를 감시모듈에서 실시간으로 계측한 후 통신에 의해 현장 제어실 PC나 Web 상에서 모니터링이 가능하지만 많은 샘플링 압력데이터 용량으로 인해 통신전송속도가 느려지고, 장기모니터링에 오류가 발생할 수 있다. 이와 같은 문제점을 개선하기 위하여 본 논문에서는 각 실린더별 압력센서에서 받은 원본 압력데이터는 NAS에 저장하고, 원본 압력데이터를 구간별 다운샘플링을 하여 제어실에서 장기모니터링하고, Web에서의 장기모니터링을 위하여 다운샘플 데이터를 무선전송 한다. 제안한 방식에서는 전송량을 1/10로 하였으므로 작은 용량을 가진 메모리를 사용할 수 있고, 빠른 통신속도를 유지할 수 있어 통신비용이 절감되며, 화면전체에 약 30일간의 장기모니터링이 가능하여 엔진의 유지관리에 큰 기여를 할 수 있을 것으로 사료된다.

• 한국토양비료학회지
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• 제46권3호
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• pp.216-222
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• 2013

Fertilizer management has the potential to promote the storage of carbon and nitrogen in agricultural soils and thus may contribute to crop sustainability and mitigation of global warming. In this study, the effects of fertilizer practices [no fertilizer (Control), chemical fertilizer (NPK), Compost, and chemical fertilizer plus compost] on soil total carbon (TC) and total nitrogen (TN) contents in inner soil profiles of paddy soil at 0-60 cm depth were examined by using long-term field experimental site at $42^{nd}$ years after installation. TC and TN concentrations of the treatments which included N input (NPK, Compost, NPK+Compost) in plow layer (0-15 cm) ranged from 19.0 to 26.4 g $kg^{-1}$ and 2.15 to 2.53 g $kg^{-1}$, respectively. Compared with control treatment, SOC (soil organic C) and TN concentrations were increased by 24.1 and 31.0%, 57.6 and 49.7%, and 72.2 and 54.5% for NPK, Compost, and NPK+Compost, respectively. However, long term fertilization significantly influenced TC concentration and pools to 30 cm depth. TC and TN pools for NPK, Compost, NPK+Compost in 0-30 cm depth ranged from 44.8 to 56.8 Mg $ha^{-1}$ and 5.78 to 6.49 Mg $ha^{-1}$, respectively. TC and TN pools were greater by 10.5 and 21.4%, 30.3 and 29.6%, and 39.9 and 36.3% in N input treatments (NPK, Compost, NPK+Compost) than in control treatment. These resulted from the formation and stability of aggregate in paddy soil with continuous mono rice cultivation. Therefore, fertilization practice could contribute to the storage of C and N in paddy soil, especially, organic amendments with chemical fertilizers may be alternative practices to sequester carbon and nitrogen in agricultural soil.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1984년도 하계학술회의논문집
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• pp.163-166
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• 1984