• 한국물환경학회지
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• 제25권1호
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• pp.58-68
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• 2009

Low impact development (LID) technique is relatively new concept to reduce surface runoff and pollutant loading from land cover by attempting to match predevelopment condition with various integrated management practices (IMPs). In this study, computational model for designing and evaluating LID, named LIDMOD, was developed based on SCS-CN method and applied at Andong bus terminal to evaluate LID applicapability and design retention/detention area for volume or peak flow control. LIDMOD simulated with 21 years simulation period that yearly surface runoff by post-development without LID was significantly higher than that with LID showing about 2.8 times and LID could reduce efficiently yearly surface runoff with 75% reduction of increased runoff by conventional post development. LIDMOD designed detention area for volume/peak flow control with 20.2% of total area by hybrid design. LID can also efficiently reduce pollutant load from land cover. Pollutant loads from post-development without LID was much higher than those from pre-development with showing 37 times for BOD, 2 times for TN, and 9 times for TP. Pollutant loads from post-development with LID represented about 57% of those without LID. Increasing groundwater recharge reducing cooling and heating fee, creating green refuge at building area can be considered as additional benefits of LID. At the point of reducing runoff and pollutant load, LID might be important technique for Korean TMDL and LIDMOD can be useful tool to calculate unit load for the case of LID application.

• 대한환경공학회지
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• 제32권2호
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• pp.131-140
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• 2010

도심 내에서 발생하는 음식물쓰레기와 일반 가연성쓰레기인 생활폐기물을 수거 및 집하한 후에 바이오매스로 활용하고 이를 이용하여 생성된 에너지는 주거 및 상업단지 등에 공급하는 폐기물 제로 청정도시를 구상하였다. 바이오매스 순환거점으로는 바이오에너지화 시스템을 연계한 생활폐기물 자동집하시설을 설정하였다. 바이오에너지화 시스템은 바이오가스화, 연료화, 에너지순환공정으로 구성하였다. 음식물쓰레기는 처리하면서 바이오가스화하고, 일반 가연성 쓰레기는 열분해/건조하여 연료화하며, 발생되는 바이오가스와 연료는 에너지 순환공정에서 발전기, 보일러의 연료로 사용되게 하였다. 또한, 가상의 사업 대상지구에서 음식물쓰레기 35 톤/일, 일반 가연성 쓰레기 20 톤/일로 생활폐기물 총 55 톤/일에 대한 처리 및 처분에 있어서 기존도시와 폐기물 제로 청정도시에서의 탄소저감 및 건설비를 비교하였다. 그 결과, 폐기물제로청정도시에서는 기존 도시 대비 연간 탄소배출량이 약 2.7배 저감 가능하고, 폐기물 관련 환경기초시설의 건설비도 기존도시에 비교하여 약 15%절감이 예측되었다.

• 농업과학연구
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• 제26권1호
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• pp.12-20
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• 1999

The purpose of this study was to research the change of the forest in Myungseo-lee Sanchuk-myun, Chungju where most of the area managed the Swidden Agriculture(Shifting cultivation). The mountainous district should be used and developed the multi-purposing source among the agricultural field, grassland, forest, a recreational area, and an industrial site, and should be presupposed the establishment of synthetic and efficient change system. This study began to pay attention to observe the peculiarity of Swidden Agricultural area in terms of forest aspects and to broaden the outlook of Swidden Agriculture. In the status of Myungseo-lee, prior to the Project to Rehabilitate the Illegal Swidden, from 1973 to 1976, the private forest gets 110.9ha (23ha for Seodae-village, 26ha for Dooduk-village, 6ha for Myungdol-village, 41ha for Chungam-village, 14.9ha for Pangdae-village). In Myungseo-lee. millet and corn were harvested, and they performed the rotation of planting and temporary resting by changing the field. The cultivated acreage per a house of total 5 villages in Myungseo-lee was just 0.4ha in average. The 70ha of the Swidden in Dooduk-village. Myungseo-lee, was sold to the Miwon corp. and the 342ha of that in Myungseo-lee was sold to Seohae-devlp.(SK forest). Those areas afforested. As the regulation plan for the Swidden began, the people in the site got paid for 300,000won as a migration fee. The special feature of the Swidden in Myungseo-lee was that the whole migration village was already established before the regulation plan for the Swidden began, and the yield was harvested by more than other villages the use of chemical fertilizer. And, in the Swidden agriculture, it showed the well-cultivated aspect, and the major harvest was various grains. The regulation Swidden in Myungseo-lee started in 1974.

• Journal of Biosystems Engineering
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• 제3권1호
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• pp.33-46
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• 1978

To get the goal of self-supply of food grain, improvement of post-harvest grain operations in rural area is under consideration as an important task of agriculture in Korea. This is study is focused on elimination of losses and deteriorations of grain and reduction of labour requirements and funds for post-harvest grain operations. The purpose of this study are presentation of basic data referring to conventional post-harvest grain operations in rural area and suggestion of improving methods for the operations, and also finding out reasonable operating processes of the operations. The result of this study are follows; 1. Grain drying in-the-filed which is performed before threshing has major factors of grain loss during drying, and so should be restrained as possible. Combine harvesting system is recommended among other king of mechanized harvesting systems for restraining in-the-field drying and securing available labors for drying. 2. It is predicted that mechanical grain drying could be prevalent when combine harvesting is taken place. Recommended grain drier for pre-combine harvesting system and for combine harvesting system is batch-type drier and circulating -type drier, respectively. 3. As existing farm storages for grain have insufficient spaces and offer poor conditions for grain storing , it is greatly needed to build up new storage which store only grains. And it is concluded that storing grain in community common storages in desirable. 4. Power supplying system for milling machinery in local milling plants, that a large capacity prime mover supplies power to 4 to 6 kinds of milling machinery simultaeously, should be converted to a system of several small capacity prime movers supplying power to each machiner y for the purpose of reducing extra consumption of energy. 5. Governmental grain, of which Korean farms produced, should be milled and stored in the local milling plant successively for the purpose of reducing transportation fee and stroing facilities. 6. Furture post-havest grain operations-drying, storing and milling should be periormed successively in he community common plant. And average optimum processing capacity of the plant is estimated about 300 metric ton of grain every year.

• 한국시뮬레이션학회논문지
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• 제15권3호
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• pp.87-91
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• 2006

이동통신이 생활화됨에 따라 유선망에서 사용하고 있는 초고속 인터넷을 무선망에서도 사용하고자 하는 욕구가 증가하게 되었으며 기존 WLAN(Wireless Local Area Network)시스템에서 커버리지 제한 문제와 단말의 이동성을 제공해주지 못하는 단점을 보안하고, 이동통신 시스템에서 고가의 통신요금 문제를 해결하기 위해 WMAN(Wireless Metropolitan Area Network) 표준이 새롭게 등장하였다. IEEE 802.16 계열의 WMAN 표준은 다양한 PHY 계층(SC, SCa, OFDM OFDMA)을 수용할 수 있는 MAC 표준과 단말의 이동성을 지원해주는 MAC 표준을 규정하고 있어서 차기 무선 인터넷에서 중요한 위치를 차지 할 것으로 보인다. 본 논문에서는 VoIP 서비스를 IEEE 802.16d에서 규정하고 있는 4가지 서비스 중 UGS 서비스 형태로 효과적으로 스케줄링 할 수 있는 상향링크 ON/OFF Grant 알고리즘을 제안하고 제안된 알고리즘이 규격에서 정의하는 기존의 방식과 참고문헌의 방식을 이용하여 서비스하는 것보다 VoIP 사용자의 평균 지연시간과 상향링크 자원 활용 측면에서 우수함을 NS-2 시뮬레이션을 통해 제시한다.

• 한국병원경영학회지
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• 제24권2호
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• pp.67-83
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• 2019

The aim of this study is to analyze the differences in the publicness indices depending on the environmental factors of regional public hospitals to derive the policy implications for improving management for regional public hospitals. The data of the 34 regional public hospitals from 2016 was used for the analysis. Major results of this study are as follows. First, the analysis of the differences in the scores of the medical safety net function showed significantly higher scores for regional public hospitals with a larger location, a larger number of hospitals in a unit area, a larger number of nurses per 100 beds, and the lower management fee ratio. Second, the analysis of the differences in the scores of the unmet healthcare needs showed significantly higher scores for regional public hospitals with a larger number of hospitals in a unit area, and a larger number of beds. Third, the analysis of the differences in the scores of the hospital-specialized services showed significantly higher scores for regional public hospitals with a larger location, a higher financial independence of the local government, a larger number of hospitals in a unit area, a larger number of beds, and a larger number of nurses per 100 beds. Major conclusions of this study are as follows. Consideration should be given to the appropriate number of nurses for each regional public hospital to maximize publicness by providing the appropriate amount of medical services, but not to incur unnecessary labor costs. In addition, efforts should be made to enhance profitability, which can be a means of strengthening publicness, by identifying the minimum administrative expenses required for efficient operation and reducing unnecessary administrative expenses. Finally, it is necessary to identify the appropriate number of beds to meet the needs of the customers and to create maximum profits.

• 융합보안논문지
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• 제8권3호
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• pp.73-81
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• 2008

GPS(Global Positioning System)로 물체의 위치를 파악하여 유용한 정보로 사용하는 방법에 관한 연구와 기술개발은 최근 매우 활발하다. 그러나, 물체의 위치정보를 활용하는 시스템들은 대부분 위치데이터 전송을 위한 데이터통신망을 필요로 하는데 보통 상용통신망을 이용하거나 무선 랜을 이용하여 데이터통신망을 확보하게 된다. 이 두 가지 방식은 매월 사용료를 지불하거나 초기 투자비가 과다하다는 단점을 가지고 있어 단순히 구내물체위치추적을 위해선 많은 애로 사항을 내포하고 있다. 본 연구는 근거리무선통신(ZIGBEE, 424MHz, 블루투스, 900MHz)방식에 RF중계알고리즘을 적용한 저비용의 근거리 RF중계알고리즘에 의한 구내 위치추적시스템 구축에 관한 연구로서 특정지역 내에서 위치추적 솔루션을 필요로 하거나 유비쿼터스 환경에서 데이터 전송을 위한 데이터 통신망의 확보를 좀 더 쉽고 빠르게 저비용으로 확보하고자 하는 산업분야에 유연하게 적용 할 수 있다.

• 한국경제지리학회지
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• 제9권3호
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• pp.358-378
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• 2006

본 연구는 전시컨벤션 기획가를 대상으로 서울에 대한 전시컨벤션 개최지로서의 7개 요인 및 42개 선택속성을 중요도-성취도 분석을 통하여 평가함에 목적이 있었으며 분석 결과는 다음과 같다. 첫째, 전시컨벤션 개최지의 42개 선택속성에 대한 중요도-성취도 분석 결과, 13개의 속성이 I사분면('지속적 노력필요'), 4개의 속성이 II사분면('과잉노력 지양'), 5개의 속성이 III사분면('우선시정 필요')에 그리고 20개의 속성이 IV사분면('저우선 순위')에 위치하고 있는 것으로 평가되었다. 둘째, 전시컨벤션 개최지의 7개 요인에 대한 중요도-성취도 분석 결과, 중요도와 성취도가 높은 I사분면에 위치하는 요인은 "전시컨벤션센터 시설", "전시컨벤션센터 이용비용" 및 "전시컨벤션 개최지 숙박공간" 요인으로 나타났다. 중요도는 높으나 성취도는 낮은 III사분면에 위치하는 요인은 "전시컨벤션 개최지 지역공간"으로 평가되고 있다. 한편 중요도와 성취도가 낮은 IV사분면에는 "전시컨벤션센터 운영", "전시컨벤션 개최지 관광공간" 및 "전시컨벤션 개최지 여가활동공간" 요인이 위치하는 것으로 나타났다. 셋째, 서울의 전시컨벤션 개최지로서의 중요도-성취도에 대한 평균값의 차이는 2개의 속성을 제외하고는 40개의 속성이 양의 값(+)을 나타내어 속성의 중요도에 비교하여 성취도가 낮은 것으로 평가되었다.

• Journal of Preventive Medicine and Public Health
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• 제22권2호
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• pp.236-241
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• 1989

The purpose of this study was to introduce the methodology of intervention analysis with time series data and to investigate the influence of the patient referral system on medical care utilization in Kangwha county. The data were obtained at the Kangwha Medical Inurance Society and we analysed the material based on the outpatient care fee. The results were as fellows: 1. The average outpatient care utilization in the hospital decreased by 41.7% due to the patient referral system. 2. The utilization of the health instituation increased by 278.8 persons per month due to the patient referral system. 3. The patient referral system did not influence the total outpatient are utilization. The methodology of intervention analysis, which detected the effect of intervention, will be helpful to the study of public health area.

• 한국지열·수열에너지학회논문집
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• 제15권4호
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• pp.46-54
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• 2019

In this study, the performance of a shell and tube heat exchanger (STHE) and welded plate heat exchanger (WPHE) was measured experimentally. The pass numbers of the STHE was changed by 1, 2 and 4. As a result, the WPHE showed 2.1 times higher heat exchange capacity than that of the STHE. In case of pressure drop, the STHE with 1 and 2 pass number has a lower pressure drop than the WPHE, while the STHE with 4 pass presented higher pressure drop than the WPHE. The performance index considering the heat exchange capacity and pump consumption power, showed in oder of STHE_Pass1 > STHE_Pass2 > W PHE > STHE_Pass4 under the same flow rate. Therefore, when the WPHE was designed optimally under same operating condition with STHE, the maintenance fee and space can be reduced effectively by using the WPHE.