• 대한의생명과학회지
• /
• 제26권3호
• /
• pp.230-237
• /
• 2020

Staphylococcus aureus (S. aureus) is known as a bacterium that can cause skin infections, respiratory system infections, and sinusitis; however, it can exist as a normal flora rather than a pathogen. Recently, methicillin-resistant S. aureus (MRSA) infections have emerged in the community as a new variant of community-associated (CA)-MRSA. In the present study, S. aureus and MRSA were isolated and cultured by collecting samples from facilities and environments where students and educational personnel have multiple contacts on university campuses; specifically, the nostrils and hands of college students were tested from July to September of 2019. The molecular properties of the isolated MRSA were analyzed, and the one MRSA strain was isolated from the university campuses. One MRSA that was isolated and cultured on campus was the mec complex group A and staphylococcal cassette chromosome (SCC) mec type II, which is a characteristic of healthcare-associated (HA)-MRSA, and SCCmec type V, which is a characteristic of CA-MRSA. This result was similar to other studies wherein the SCCmec type II was detected in SCCmec typing analysis in CA-MRSA. To confirm whether there is a new variant of CA-MRSA in the Republic of Korea, additional follow-up studies on the analysis of virulence factors of MRSA are needed by additionally separating CA-MRSA from the body parts of university students and educational personnel.

• 한국환경생태학회지
• /
• 제26권6호
• /
• pp.884-891
• /
• 2012

2008년 8월부터 2009년 6월까지 양화천의 8개 미소서식처 유형에 따른 어류상 및 군집의 분포특성을 조사하였으며, 조사기간 동안 채집된 어류는 총 8과 30종 2,797개체가 확인되었다. 출현한 어종 중 한국고유종은 Rhodeus uyekii 등 총 10종(33.3%)으로 확인 되었으며, 우점종은 Rhodeus notatus, 아우점종은 Pseudorasbora parva였다. 서식처 유형별 우점종은 댐형 웅덩이, 개방형 하도습지에서 Pseudorasbora parva, 평여울에서 Pseudogobio esocinus, 급여울에서 Zacco platypus, 샛강, 낙차형 웅덩이에서 Rhodeus notatus, 사행형 웅덩이에서 Squalidus gracilis majimae, 폐쇄형 하도습지에서 Carassius auratus가 우점하였다. 군집분석 결과 우점도지수는 낮고, 다양도지수, 균등도지수, 풍부도지수는 높게 나타나 서식처 유형별 비교적 안정적인 군집구조를 유지하고 있는 것으로 분석되었다. 유사도 분석과 주성분 분석 결과 8개의 서식처 유형들이 유수역 특성이 나타나는 서식처와 정수역 특성이 나타나는 서식처로 구분되어 분석되었다.

• 대한환경공학회지
• /
• 제32권2호
• /
• pp.113-120
• /
• 2010

분리막의 종류 및 환원전극의 특성에 따른 전기발생량 및 미생물 군집을 비교하기 위하여, 분리막 및 환원전극의 특성이 다른 4개의 단위전지로 구성되어 있는 공기환원전극 미생물연료전지(4 air-cathode microbial fuel cell)를 회분식 운전하였다: A) PEM(Proton Exchange Membrane)-30% Wet proofing Carbon Cloth(WC), B) AEM(Anion Exchange Membrane-WC, C) CEM(Cation Exchange Membrane)-WC, D) PEM-No Wet proofing Carbon Cloth(NC). 분리막의 종류에 상관없이 최대전력밀도는 PEM-WC(510.9 $mW/m^2$), PEM-WC(522.1 $mW/m^2$), PEM-WC(504.8 $mW/m^2$)로 유사하였으나, 환원전극이 달랐던 PEM-NC는 218.3 $mW/m^2$으로 낮게 나왔다. 내부저항은 분리막의 종류에 상관없이 20.8-28.2 ${\Omega}$으로 유사하게 나타났다. PCR-DGGE, PCA, 종다양성 분석 결과, 부유미생물 군집은 시간이 경과함에 따라 다르게 나타났으며 기존 MFC 연구에서 보고되었던 uncultured bacteria가 관찰되었다. 한편, 부착미생물 군집은 분리막의 종류에 따라 큰 변화를 나타내지 않았지만, 환원전극의 특성에 따라 군집의 변화가 관찰되었다. 따라서, 기존의 이온교환막을 분리막으로 사용하는 공기환원전극 MFC에서는 환원전극의 선택도 중요한 것으로 나타났다.

• 한국지역지리학회지
• /
• 제19권1호
• /
• pp.97-110
• /
• 2013

본 연구는 부산 북구 화명동을 대상으로 농촌에서 도시로의 전환에 따라 나타나는 공간구조의 변화 과정을 고찰하고 화명동 내외부의 관점에서 획일화, 위계화 등 공간구조의 재구성에 따른 문제점과 특성을 파악해 보고자 하였다. 산업화, 도시화로 인한 도시공간의 팽창으로 농촌에서 도시로 변한 화명동은 고유의 자연환경, 자연마을 등이 사라지고 주거, 상업지역 등으로 바뀌었다. 이에 따라 역사적, 구체적 장소는 사라지고 개발과 발전이라는 명목 하에 전국 어디서나 볼 수 있는 아파트를 중심으로 연출되는 공간의 균질화와 획일화가 이루어졌다. 하지만 주민들의 힘과 노력으로 지켜낸 화명동 고유의 역사와 관습, 기억과 흔적들 그리고 생태하천으로 변모시킨 대천천 등에서 화명동만의 특이성을 드러내고 있었다. 또한 동질적인 농촌공간이었던 화명동은 아파트 공급주체와 규모, 산업시설의 종류와 분포, 주민들의 구성 등의 측면에서 이질적이고 다층적인 도시공간으로 변하였으며 이는 공간뿐 아니라 주거, 교육, 문화 등의 세분화, 위계화를 야기하고 있었다. 특히 대규모 아파트밀집지역으로 개발된 화명3동은 화명2동과 큰 격차를 드러냈으며 과거 중심지였던 화명2동은 주변화 되고 있는 것으로 나타났다. 그러나 화명2동에는 생태주거공동체와 교육문화공동체를 중심으로 살기좋은 마을을 만들기 위한 주민들의 움직임과 노력이 있음을 확인할 수 있었다.

• 한국주거학회:학술대회논문집
• /
• 한국주거학회 2011년도 춘계학술발표대회 논문집
• /
• pp.65-68
• /
• 2011

The average increase in life expectancy obtained as a gift of modern science cannot hold itself responsible for extended life's happiness. It admits of no argument that the necessity of social preparation for minimizing bad health and longevity of unhappiness to aged people who are in the state of these continuous growth. Recently, because of an aging trend, targeting on elderly housing expected continuous increased demand in housing market, this study is to comprehend it's characteristic and offer implications. For the characteristic of elderly housing, firstly it needs scientific analysis of related theory and analysis of statistical data. Also this study aims to look through and suggest an alternative included the special matters of Korean society with advanced foreign country's analysis of an alternative. And judging from economic characteristics of elderly housing to be presented as an important factor, choices of housing according to economic level are anticipated to show different forms. In future, to supply elderly housing, therefore, the introduction of the concept of housing providing various opportunity of choice is necessary. If studies proceed through expanded alternative, it is judged to be able to draw more varied results in elderly housing. Also, if going along with political dimension study, it is expected to offer more specific and effective solutions of the problem of elderly housing.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2011년도 제42회 하계학술대회
• /
• pp.2069-2070
• /
• 2011

In this paper, the fault diagnosis for a gearbox of BLDC motor. The stator of BLDC motor consists of coil winding so it is easy to cool down and it also has a high reliability. In addition, it doesn't have a brush so it is less trouble and good in maintenance. Coupling with the motor which is the power sources, the gear has a high power transfer efficiency and various rotation speed. The gear gets a high driving force through deceleration. Thus it has been widely used. The gearbox fault detection area has not attracted much attention from electrical engineering community. A few papers describe gearbox fault based on vibration. Gearbox fault is diagnosed through FFT analysis of current and voltage. Fault characteristic frequency side band detected by calculating fault frequency. A threshold value is suggested by comparing normal peak value with fault peak value using detected fault characteristic frequency side band. Experimental results demonstrate that motor current and voltage signal analysis are viable tools in detecting these gear faults. Lower side band(LSB) is bigger than upper side band(USB) in current FFT. LSB and USB are similar in voltage FFT. Finally, fault diagnosis system that can easily detect flaws is developted for gearbox of BLDC motor.

• KIEAE Journal
• /
• 제15권2호
• /
• pp.87-94
• /
• 2015

Purpose: Lately, The mixed use development on railroad site came up in government policy about securing development available land for public rental housing and social cohesion. The Purpose of this study is to analyze the spatial composition characteristic in housing development example of domestic and foreign through the mixed-use development of railway depot. Method: Site cases are as follows: Shimura Depot(Japan), Kowloon Bay Depot(Hongkong), Chai Wan Depot (Hongkong), Tsuen Wan Depot(Hongkong), Montparnasse Station(France), Euralille Depot(France), Sin Jeong Depot (Korea), Tai Wai Depot(Hongkong), Tseung Kwan O Depot(Hongkong) and Rive Gauche(France). Railway Depot caused various problems such as the lacking of the feeling of solidarity of local inhabitants and the sense of community. In the case of Hong Kong and a France development example to solve these problems, the architectural characteristics appears. Result: At first it is located facilities together such as commerce, duties, the culture. Further, the publicity of the house place is strengthened because an open space, a park are developed on the railroad site. And a variety of connection systems appear between the outside space with a house housing complex built on the artificial ground. Particularly, the development example has an approach and convenience, and it was confirmed that publicness was considerably high.

• 한국환경과학회지
• /
• 제19권2호
• /
• pp.197-207
• /
• 2010

This study was carried out to investigate the ecological characteristic of native Parasenecio firmus population in Korea and China. The survey quadrates were located in the middle of the native P. firmus habitats. According to the field survey, the habitats of P. firmus were classified into same Tilia amurensis community in tree layer. The investigation of native habitat in Korea shows that P. firmus inhabited deciduous forest from with T. amurensis, Acer pictum subsp. mono, Carpinus cordata and Acer pseudosieboldianum, which was similar to vegetation structure of Mt. Laoling in China. The result of the cluster analysis which uses SYN-TAX 2000 program, dissimilarity from 53% level was on a large scale divided at 2 units. The research revealed 96 taxa in total, in which 51 families, 81 genera, 21 varieties, 5 forma, 1 sub-species and 67 species were checked in the flora of the native P. firmus habitats.

• 한국유기농업학회지
• /
• 제20권4호
• /
• pp.447-458
• /
• 2012

This study was carried out to evaluation of biomass generation mechanisms and to propose the estimation method of biomass generation. Agricultural by-product biomass is generated during crops cultivation and after harvest. However these are not uniformly generated yearly and these depending on the seasons. For planning of biomass utilization, accurate information of the biomass resources is needed, especially characteristic and productivity of biomass are necessary. Agricultural by-product biomass are generated in a wide area being scattered and it is one of the major reason why agricultural biomass utilization is not activated compared with other waste biomass. In this study, estimation and evaluation biomass generation is achieved in specific spatial and temporal boundary, A-city in Gyeongi-do and september to November respectively. Quantity and quality of by-product biomass show big difference depending on the crop species and cultivation periods and these difference bring up that accurate biomass estimation should be considered during planning of biomass utilization and technology selecting for biomass converting to energy and other forms.

• 한국농공학회논문집
• /
• 제55권6호
• /
• pp.77-85
• /
• 2013

The efficient operation and management strategies of reservoirs in irrigation periods of drought events are an essential element for drought planning and countermeasure. Korea Rural Community Corporation has developed the real-time water level observation system of agricultural reservoirs to efficiently operate reservoirs, however, it is not possible to predict drought conditions, and only provides information of current situation. Hence, it is necessary to evaluate accurate irrigation vulnerability and efficiently reservoir operation rules using current water level. In this paper, the improvement methods of reservoir operation planning were developed with water supply vulnerability characteristic curves comparing to automatic water gauge at agricultural reservoirs. The 11 reservoirs were simulated applying the reservoir operation rules which was determined by irrigation vulnerability characteristic curves criteria and real time water level, and evaluated water supply situation in 2012 year. The analysis of results can be identified probabilistic possibility of water supply failures compared with the existing reservoir operation criteria. These results of efficient reservoir operation rules can be achieved enable irrigation planners to optimally manage available water resources for decision making, and contributed to maintain the water supply according to demand strategy for agricultural reservoirs management.