• 터널과지하공간
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• 제16권4호
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• pp.296-306
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• 2006

국내 천연가스 수요의 동고하저의 수요패턴과 도입패턴의 불일치 및 저장시설의 한계 등으로 수급관리의 어려움이 내재하고 있고 LNG 생산지 사고 등 도입선 공급불안 요인이 상존하고 있다. 따라서 LNG의 안정적 수급관리를 위하여 장기간 저장이 가능한 대규모 저장시설의 확보가 매우 중요한 실정이다. 이에 한국지질자원연구원에서 Pilot Plant 운영을 통하여 검증된 복공식 저장공동기술의 국내 적용성 여부를 검토하고자 한다. 이 기술은 기존의 지상식과 반지하식에 비하여 경제성 안전성 및 환경친화성 등에 유리하며 특히 기화율 저감으로 인한 LNG 장기 저장이 가능하다는 장점을 가지고 있다. 따라서 LNG 지하공동 비축시스템의 국내 도입을 위하여 지하저장기술의 기술적 타당성 건설 및 운영비용 등에 대하여 살펴보았다.

• 한국환경과학회지
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• 제24권11호
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• pp.1417-1430
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• 2015

In this study we were to explore the seasonal variation of water temperature distributions before and after weir construction at Gumi, Chilgok, Gangjung(Goryung), Dalsung in the Nakdong River using Landsat satellite images. Relationship between in-situ water temperature and radiance values of Landsat-5, 7, 8 satellite images showed high correlation. Seasonal variation of water temperature in Nakdong River showed that the fluctuation ranges of water temperature before weir construction were larger than those after weir construction. This indicated that the variation of water temperature is due to the difference of heat storage volume by weir construction and dredging work. In particular, the water temperature after weirs construction in autumn was 4-8 times lower than that before weirs construction. Water temperature after weir construction decreased in spring and summer at the downstream of Gumi weir and Gangjung(Goryung) weir, and the upstream of Dalsung weir. In autumn and winter, the water temperature after weir construction increased in the upstream and downstream of the whole weirs except upstream of Gumi weir. Relationship between water temperature and meteorological elements (air temperature, wind speed, sunshine, radiation) showed high correlation of above 94% in air temperature, and then radiation was high correlation before and after 65%.

• International Union of Geodesy and Geophysics Korean Journal of Geophysical Research
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• 제22권1호
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• pp.1.1-15
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• 1994

열대 대서양의 해표면으로부터 500m 깊이까지의 계절별 담수 및 염분의 수송량과 방향을 조사하기 위하여, 먼저 연속방정식과 염분보존방정식에서 각각 이론적인 계산방법을 유도하고 관측자료를 사용하여 수송값들을 얻었다. 담수(강수량, 증발량, 그리고 강물방출량)의 기후자료에서 계산된 표면의 당수발산장을 북쪽에서 남쪽방향으로 적분하여 담수수송값을 얻었디. 연간 담수수송량의 방향은 북향으로 수송량은 적도부근에서 가장 적었고 (0 Sv), $12^{\circ}N와{\;}20^{\circ}{\;}N$부근에서 가장 많았다(0.3 Sv). 게절별 수송량의 크기는 북향 1.35 Sv괴 남향 O.45 Sv의 사이의 값을 보였고 강한 북향 수송량이 여름과 가을사이의 전이기간에서 나타났다. 이러한 계절별화는 지역적인 담수저장의 변화 뿐만 아니라 열대 수렴대의 이동과 관련이 있었다. 1900~86 기간의 염분관측값을 객관분석(objective analysis)한 후, 연간 및 계절별 염분 수송값을 계산하는데 사용하였다. 수평이류에 의한 염분수송량이 수형확산에 의한 수송량과 균형을 이룸으로 해서 연간 수송량은 없었다. 딘지 수평확산에 의한 염분수송량은 북향이었고 $15^{\circ}{\;}N$에서 최대값($5{\times}10^6kg/s$)을 보였다. 계절별 수송량의 크기는 북향 $30{\times}10^6kg/s$과 남향 $35{\times}l0^6kg/s$사이의 범위내에 있었다. 계절별 수송방향은 여릉과 가을사이의 기간을 제외하고 다른 기간에서 북향이었다.

• 한국디지털건축인테리어학회논문집
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• 제12권1호
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• pp.45-51
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• 2012

To see sunlight condition around in storage room, this study analyzers the scope both of sunlight and of the shade of sun into upper and lower window according to seasons. For this, this study investigates sun's seasonal changes, its effect of sunlight and notes antinomic conditions for ventilation and draft performance. In this, Architects of Jangkyunggak tride to block discoloration and fading due to ultraviolet rays and visible rays and block deterioration drying of the surface of Kyung-Pan due to infrared rays by oppressing sunlight flowing by means of narrowing the area of the upper window at front face that has a direct influence of Pan-Ga to avoid the exposure to direct sunlight.

• 한국주거학회논문집
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• 제1권1호
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• pp.9-26
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• 1990

The purpose of this study is to analyze the quantity, residents` storing manner, and frequency in use of the stored items in bedrooms. and to comprehend the relevant desires of the residents in apartments. The results of the study are summarized as follows; 1. The quantity of the stored Items in bedrooms of apartments were measured after classified into 4 categories; Western style clothes, Korean costumes, underwears, and miscellaneous items. The quantity of the stored items In Rl(the largest bedrooms) was more than twice as many as in R2(the second largest bedrooms)2. The stored items were divided inte 3 categories according to the manner in which they were stored; those generally hung, those generally folded, and those hung or folded half-and-half.3. The frequency in use of the stored items was classified into 2 categories-those used "always" or "often" and those used "seasonal" or "seldom"·and shown diversely according to the kind of items4. It was shown that most residents in apartments were not much satisfied with storage space, i.e.. they generally fell the storage space insufficient. And they tended to want more wardrobes in Rl, and more shelves in R2.

• 대한안전경영과학회지
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• 제6권3호
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• pp.141-152
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• 2004

Supply chains for agricultural commodities with their various constraints such as production lead time, seasonal production, and methods of storage are limited in the extent to which techniques like Just-in-Time (JIT) inventory management can be applied. It is beyond the ability of producers to control harvest time and many agricultural products are perishable so that they can incur exceptional losses in storage if they are not handled correctly. This is a source of additional costs and inefficiency in supply chain management. The purpose of this study is to reduce or eliminate such sources of loss and inefficiency and to identify success factors for the JIT inventory management system where it can be applied for agricultural products. Where JIT techniques can be applied in supply chain management for agricultural products, costs such as transportation, inventory, and storage losses can be reduced with concurrent increases in efficiency. In the paper, some of the problems associated with applying JIT inventory control methods in supply chain management for agricultural commodities will be reported through a series of case studies.

• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2004년도 춘계학술대회
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• pp.191-201
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• 2004

Supply chains for agricultural commodities with their various constraints such as production lead time, seasonal production, and methods of storage are limited in the extent to which techniques like Just-in-Time (JIT) inventory management can be applied. It is beyond the ability of producers to control harvest time and many agricultural products are perishable so that they can incur exceptional losses in storage if they are not handled correctly. This is a source of additional costs and inefficiency in supply chain management. The purpose of this study is to reduce or eliminate such sources of loss and inefficiency and to identify success factors for the JIT inventory management system where it can be applied for agricultural products. Where ]IT techniques can be applied in supply chain management for agricultural products, costs such as transportation, inventory, and storage losses can be reduced with concurrent increases in efficiency. In the paper, some of the problems associated with applying ]IT inventory control methods in supply chain management for agricultural commodities will be reported through a series of case studies.

• KIEAE Journal
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• 제16권3호
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• pp.25-34
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• 2016

Purpose: The temperature in Seoul has risen 3 times more than the average global temperature increase for the past 100 years. Today, summer starts 15 days earlier than the early 20th century and is 32 days longer. This tendency causes rapid increase of cooling energy demand. Following this effect, seawater heat resources are to be used as an countermeasure for global warming. Incheon Port near the Western Sea has the lowest water temperature in the winter in South Korea in which it is suitable to use seawater cold heat resources. Method: The cold heat resource is gained from seawater when the water temperature is the lowest in the winter time and saved in a seasonal thermal storage. This can be used as cold heat resource in the summer time. A heat exchanger is essential to gain seawater cold energy. Due to this necessity, sea water heat resource heat exchangers are modeled by heat transfer equations and the fluid characteristics are analyzed. Also, a CFD (computational fluid dynamics) program is used to conduct simulation on the fluid characteristics of heat exchangers. The analyzed data of deducted from this process are comprehensively analyzed and discussed. Result: Regarding the performance of the heat exchanger, the heat exchanger was operated following the prediction within the range of heat transfer rate of minimum 3.3KW to maximum 33.6KW per device. In the temperature change analysis of the heat exchanger, fluid analysis by heat transfer equations almost corresponded to the temperature change by CFD simulation. Therefore, it is considered that the results of this study can be used as design data of heat exchangers.

• 한국유기농업학회지
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• 제16권3호
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• pp.321-330
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• 2008

산양유의 계절별 및 농장별 이화학적 특성을 구명하기 위하여 본 연구의 결과 및 타지역에서의 산양유 성분인 Fat, Protein, Lactose, Total Solid, SNF, Cells 성분 등을 살펴본 결과 $12{\sim}6$월 사이의 값 중에서 2월과 3월에 Fat, Protein, Lactose, Total Solid, SNF, Cells 값이 높은 경향을 보였고, 특히 Fat의 경우 $12{\sim}3$월까지의 값이 다른 월별 성분보다 더욱 높은 값을 보였다. SNF의 경우도 2월에 다른 월별 성분보다 월등히 높은 값을 나타냈다. 그러나 Lactose는 계절 또는 월별간 큰 차이를 보이지 않았다. 산양유 성분의 지역별 차이 또한 크지 않았으며 일반 유성분 자료를 본 연구의 결과와 참고자료를 함께 비교 검토한 결과 산양유의 일반조성은 cow milk와 전체적으로 비슷하나 Fat 성분에서 약간 낮은 값을 보였고, Mare milk 보다는 전체적으로 높은 값을 보였다. 산양유 생산은 산양의 계절번식에 의한 계절간 생산량의 편차가 커 수급조절이 어려운 문제점이 있으므로 국내 산양유 산업의 발전을 위해서는 산양유 제품의 소비를 촉진시킬 수 있는 저장성이 우수한 다양한 기능성 제품을 고안하여야 한다고 사료된다.

• 한국농공학회논문집
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• 제59권6호
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• pp.127-135
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• 2017

In this study, a cold well and a warm one with the distance of 100 m were installed in the alluvial aquifer. Groundwater used as the heat and the cold source of heat pump was designed to flow into the warm and the cold well with a diameter of 200 mm. In order to increase the heat and cold storage in aquifer, six auxiliary wells with the diameter of 50 mm and the depth of 30 m were installed at an interval of 5 m from the main well. Also, heat pump 50 RT, the thermal tank $40m^3$, and a remote control and monitoring system were installed in three single-span greenhouses ($2,100m^2$) for growing tomato in Buyeo, Chungcheongnam-do. According to the aquifer heat storage test which had been conducted from Aug. 31 to Sep. 22, 2016, warm water of $850m^3$ was found to flow into warm well. The temperature of the injected water was $30^{\circ}C$ (intake temperature : $15^{\circ}C$), and the heat of 12.8 Gcal was stored. The greenhouse heating test in winter had been conducted from Nov. 21, 2016 to Apr. 30, 2017. On Nov. 21, 2016 when heating greenhouse started, the aquifer temperature of the warm well was $18.5^{\circ}C$. The COP for heating with water source at $18.5^{\circ}C$ was 3.8. The intake water temperature of warm well was gradually lowered to the temperature of $15^{\circ}C$ on Jan. 2, 2017 and the heat pump COP was measured to be 3.2 at that time. As a result, the heat pump COP was improved by 18 %. and retrieval heat was 8 Gcal, the retrieval rate of heat stored in aquifer was estimated at 63 %.