• 임상이비인후과
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• 제29권2호
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• pp.223-228
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• 2018

Background and Objectives : Necortizing fasciitis in the cervical region is a very rare disease with high mortality and morbidity rates. The purpose of this study was to analyze the clinical characteristics, treatment results, complication and prognosis of necrotizing fasciitis patients. Materials and Methods : We retrospectively reviewed the inpatient charts treated for cervical necrotizing fasciitis at our Otorhinolaryngology clinic. We diagnosed necrotizing fasciitis by the clinical findings such as swelling, redness and pain of infected area and necrosis of subcutaneous fat layer and fascia observed during surgery. Twenty such patients were identified and treated from January 2011 to December 2016. Results : 20 adults consisting of 14 male and 6 females with cervical necrotizing fasciitis were diagnosed and treated. The most commonly known associated preceding illness were dental abscess and tonsillitis. The most pathogen was Streptococcus species (12/20), followed by Klebsiella pneumonia (6/20), Staphylococcus species (2/20). The mean duration of hospitalization was 32.2 days (range,14-86). The mean Modified Laboroatory Risk Indicator for Necrotizing Fasciitis (M-LRINEC) score is 7.4 and more than 4 points was eighteen. All patients received parenteral antibiotics and surgical drainage after admission. Conclusions : The reason for the high survival rate in the study was the early diagnosis, as well as the early surgical procedure and antibiotics. After the operation, frequent betadine irrigation could improve the patient's condition and recover without severe complication.

• 한국추진공학회지
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• 제15권2호
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• pp.56-61
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• 2011

추력 75톤급 액체로켓엔진용 터보펌프 조립체 실물형에 대하여 정격 회전수에서 성능시험이 수행되었다. 실매질 대신 상사매질을 사용하였는데 산화제펌프에는 액체질소, 연료펌프에는 물, 터빈에는 고온 공기가 공급되었다. 시험 중 터보펌프는 안정적으로 운전되었으며 성능 요구조건을 만족시켰다. 운전 초기의 회전수 상승구간에서도 펌프의 양정계수와 유량계수는 일정하게 유지되었다. 터보펌프 단품 성능시험과 조립체 성능시험 결과를 비교할 때 펌프 양정계수와 터빈 효율이 두 종류의 성능시험에서 비교적 잘 일치하였다.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2010년도 제35회 추계학술대회논문집
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• pp.27-32
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• 2010

추력 75톤급 액체로켓엔진용 터보펌프 조립체 실물형에 대하여 정격 회전수에서 성능시험이 수행되었다. 실매질 대신 상사매질을 사용하였는데 산화제펌프에는 액체질소, 연료펌프에는 물, 터빈에는 고온 공기가 공급되었다. 시험 중 터보펌프는 안정적으로 운전되었으며 성능 요구조건을 만족시켰다. 운전 초기의 회전수 상승구간에서도 펌프의 양정계수와 유량계수는 일정하게 유지되었다. 터보펌프 단품성능시험과 조립체 성능시험 결과를 비교할 때 펌프 양정계수와 터빈 효율이 두 종류의 성능시험에서 비교적 잘 일치하였다.

• Journal of Ginseng Research
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• 제22권1호
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• pp.66-72
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• 1998

Studies were performed to determine the effect of Korean red ginseng (extract powder, spray-dried), it is made of choice 6-year-old raw ginseng roots, and processed by steaming and drying, on jejunal crypt survival, endogenous spleen colony formation, and apoptosis in jejunal crypt cells of irradiated mice. Jejunal crypts were protected by pretreatment of red ginseng (1 mg/head, single I.P. at 24hours before irradiation, p<0.05). Red ginseng administration before irradiation (1 mg/head, single I.P at 24hours before irradiation) resulted in an increase of the formation of endogenous spleen colony (p<0.05). The frequency of radiation-Induced apoptosis in intestinal crypt cells was also reduced by treatment of red ginseng both pretreatment (P.O.: 2 mg/ml of drinking water for 7 days, p<0.005, I.P.: 1 mg/head, single I.P. at 24 hours before irradiation, p<0.005) and post-treatment (1 mg/head, single I.P at 30 minutes after irradiation, p<0.05). These results indicated that Korean red ginseng might be a useful radio-protector, especially since it is a relatively nontoxic natural product. Further studies are needed to characterize better the promotion nature of red ginseng and its fractions.

• 한국산학기술학회논문지
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• 제22권2호
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• pp.610-616
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• 2021

본 연구는 마을 향약의 내용 중 이장선출 규정을 분석하여 문제점을 파악하고 개선방안을 제시하기 위한 문헌연구다. 자료수집은 2019년 1월부터 2019년 8월까지 총 146개 마을의 향약을 수집하여 분석하였다. 분석 결과, 민주적인 절차를 통해 마을주민들이 직접 이장을 선출하고 있는 마을이 많은 것으로 분석되었다. 개선방안으로 선거권에서는 성평등한 참여와 참정권 보장을 명문화할 수 있도록 1세대 1표제의 선거권을 1인 1표제로 개선을 제언하였다. 임용 방법에서는 첫째, 마을 출생자가 아니면 이장 후보자가 될 수 없는 이장 후보자에 대한 자격 개선, 둘째, 각종 재해 발생 시 신체적 능력과 마을사업 수행에 따른 활동성 요구로 이장 후보자의 나이를 65세 이하로 나이 상한 지정, 셋째, 지역 토착 세력으로 자리할 수 없도록 이장이 임기를 후임자가 없는 경우 연임이 가능하다는 이장연임 규정 제한, 넷째, 마을 발전이라는 공공적 이익에 충실할 수 있도록 봉사자로서의 위상 정립을 위한 교육 필요성을 제언하였다.

• 한국지열·수열에너지학회논문집
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• 제9권3호
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• pp.1-10
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• 2013

Open loop geothermal heat pumps have great potential where the groundwater resources are sufficient. Performance of open loop geothermal heat pump systems is considered higher than that of ground source heat pumps. Head and power calculation of submersible pumps, heat pump units, and piping are numerically based on regression data. Results shows that the system performance drops as the water level drops, and the lowest flow rates generally achieve the highest system COPs. The highest achievable cooling system COPs become 6.34, 6.12, and 5.95 as the groundwater levels are 5m, 15m, and 25m. The highest heating system COPs also become 4.59, 4.37, and 4.20. Groundwater level and submersible pump selection greatly influence the system performance of open loop geothermal heat pumps. It needs to be analysed during the design process of open loop geothermal heat pump system, possibly with analysis tools that include wide range of pump product data.

• 한국유체기계학회 논문집
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• 제4권4호
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• pp.22-27
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• 2001

The pump/motor selection program for optimized selection of regional water supply facilities was developed based on a flowchart compiled from basic operational data, total head requirement, initial pump/motor specification selection etc. This program was developed in Visual Basic. The program accepts, as in the flowchart, operational requirements of pumps and other system requirements, and calculates specific speed based on flow rate, total head and rotational speed. Then the calculated specific speed is used to select pump types and speed prior to determining likelihood of cavitation occurring at the calculated NPSH. Power requirement is then calculated for safe operation of pump to assist final pump selection. Test results of the program match very closely to the design values of Paldang intake pump station(3rd stage) proving that the program can be used as an effective and practical aid for designing new regional water supply systems.

• 한국유체기계학회 논문집
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• 제14권5호
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• pp.12-17
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• 2011

The seawater lift pump system is responsible for maintaining the open canal level to provide the suction flow of circulating water pump at the set point. The objective of this paper is to design a 2-stage mixed flow pump (for seawater lifting) by inverse design method and to evaluate the overall performance and the local flow fields of the pump by using a commercial CFD code. Rotating speed of the impeller is 1,750 rpm with the flow rate of 2,700 $m^3$/h. Finite volume method with structured mesh and realized k-${\varepsilon}$ turbulent model is used to guaranty more accurate prediction of turbulent flow in the pump impeller. The numerical results such as static head, brake horse power and efficiency of the mixed flow pump are compared with the design data. The simulated results are good agreement with the design data less 3% error.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2011년 춘계학술대회논문집
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• pp.556-560
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• 2011

The seawater lift pump system is responsible for maintaining the open canal level to provide the suction flow of circulating water pump at the set point. The objective of this paper is to design a 2-stage mixed flow pump(for seawater lifting) by inverse design and to evaluate the overall performance and the local flow fields of the pump by using a commercial CFD code. Rotating speed of the impeller is 1,750 rpm with the flow rate of 2,700 $m^3/h$. Finite volume method with structured mesh and Realizable ${\kappa}-{\varepsilon}$ turbulent model is used to guaranty more accurate prediction of turbulent flow in the pump impeller. The numerical results such as static head brake horse power and efficiency of the mixed flow pump are compared with the reference data. Also, the periodic condition calculation method for the mixed flow pump was carried out in order to investigate the pump performance characteristics with the modification of impeller geometry.

• 한국해양공학회지
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• 제25권5호
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• pp.21-26
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• 2011

Seawater lift pump systems are responsible for maintaining open canal levels to provide the suction flow of circulating water pumps at the set point. The objective of this paper is to design a 2-stage mixed flow pump (for seawater lifting), investigate the new impeller modeling method, and performance improvements of the impeller by using a commercial CFD code. The rotating speed of the impeller is 1,750 rpm with a flow rate of 2,700 m3/h. A finite volume method with a structured mesh and realized k-${\varepsilon}$ turbulent model is used to guarantee a more accurate prediction of turbulent flow in the pump impeller. The performance variables such as the static head, brake horsepower, and efficiency of the mixed flow pump are compared based on changes in the impeller blade shape.