• 전자통신동향분석
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• 제27권2호
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• pp.11-20
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• 2012

세계가 하나로 이어지는 글로벌화 경향에 따라 항공교통량의 지속적인 성장과 그에 따라 보다 체계적이고 안전한 비행작업을 위하여 항공기에서 요구되는 데이터 트래픽이 증가함으로 인하여 높은 데이터 전송률과 안정적인 성능을 보이는 새롭고 더욱더 효율적인 고속 광대역 통신 시스템의 필요성이 부각되고 있다. 이와 관련하여 본고에서는 미래 고속 항공 데이터 통신 시스템에 대한 결정사항 중에서 airport 영역, 특히 고밀집 지역에서 사용되는 IEEE 802.16e-2009 규격을 기반으로 하는 무선통신 시스템인 AeroMACS 시스템 (Aeronautical Mobile Airport Communications System)에 대하여 살펴보고자 한다.

• 한국가금학회:학술대회논문집
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• 한국가금학회 2002년도 가을 학술발표논문집
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• pp.98-99
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• 2002

Collection of large number of gonadal Primordial germ cells(gPGCs) is a prerequisite factor for improving germline transmission efficacy in the aves, In this study a magnetic-activated cell sorter(MACS) was applied for improving retrieval efficacy of quail gPGCs and the migration capacity of MACS-separated gPGCs was further examined after being transplanted to recipient embryos. We also induced germline chimeras by transfer of MACS-separated quail gPGCs at the efficiency of 17.4% on average.

• 대한의용생체공학회:학술대회논문집
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• 대한의용생체공학회 1994년도 춘계학술대회
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• pp.49-52
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• 1994

We have developed a biological signal measurement, archiving, and communication system (SiMACS). The front end of the system is the intelligent data processing unit (IDPU) which includes ECG, EEG, EMG, blood pressure, respiration, temperature measurement modules, module control and data acquisition unit, real-time display and signal processing unit. IDPUS are connected to central data base unit through LAN(Ethernet). Workstations which receive signals from central DB and provide various signal analysis tools are also connected to the network. The developed PC-based SiMACS is described.

• 산업공학
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• 제19권1호
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• pp.1-8
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• 2006

The mobile communication network has to offer good quality of services (QoS), high capacity, and more coverage at a lower cost. However, with the increase of cellular user, the shortage of capacity due to unbalanced call distribution and lack of QoS are common. This paper deals with dynamic sectorization for efficient resource management to solve load unbalancing among microcells in CDMA (Code Division Multiple Access) microcellular system. Dynamic load balancing can be effected by grouping micro-cells properly and grouping can be developed through a routing mechanism. Therefore, we use ants and their routes to choose the optimum grouping of micro-cells into sectors using Multiple Ant Colony System (MACS)in this paper.

• Mycobiology
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• 제48권6호
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• pp.501-511
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• 2020

Xylophagous termites are capable of degrading lignocellulose by symbiotic gut microorganisms along with the host's indigenous enzymes. Therefore, the termite gut might be a potential niche to obtain natural yeasts with celluloytic, xylanolytic and ethanologenic traits required for bioethanol production from lignocellulosic biomass. In this study, we cultured 79 yeasts from three different termites viz. Coptotermes heimi, Odontotermes javanicus and Odontotermes obesus. After suitable screening methods, we identified 53 yeasts, which belonged to 10 genera and 16 different species of both ascomycetous and basidiomycetous yeasts. Most yeasts in the present study represent their first-ever isolation from the termite gut. Representative strains of identified yeasts were evaluated for their cellulolytic, xylanolytic, and ethanologenic abilities. None of the isolates showed cellulase activity; 22 showed xylanolytic activity, while six produced substantial quantities of ethanol. Among xylanolytic cultures, Pseudozyma hubeiensis STAG 1.7 and Hannaella pagnoccae STAG 1.14 produced 1.31 and 1.17 IU of xylanase. Among ethanologenic yeasts, the strains belonging to genera Candida and Kodamaea produced high amount of ethanol. Overall, highest ethanol level of 4.42 g/L was produced by Candida tropicalis TS32 using 1% glucose, which increased up to 22.92 g/L at 35 ℃, pH 4.5 with 5% glucose. Fermentation of rice straw hydrolysate gave 8.95 g/l of ethanol with a yield of 0.42 g/g using the strain TS32. Our study highlights the gut of wood-feeding termites as a potential source of diverse yeasts that would be useful in the production of xylanase and bioethanol.

• Nuclear Engineering and Technology
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• 제54권9호
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• pp.3440-3447
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• 2022

The accuracy of the photoatomic cross-section data is of great importance in the field of radiation protection, particularly in the characterization of radiation shielding materials. With the release of the latest and probably the most accurate photoatomic data library, EPDL2017, the need to re-evaluate all the existing and already established mass attenuation coefficients (MACs) of all radiation shielding materials arises. The MACs of several polymers, alloy-based, glasses, and building materials used in a nuclear medicine facility were investigated using the EPDL2017 library embedded in EpiXS software and were compared to MACs available in the literature. The relative differences between MAC_EpiXS and MACXCOM were negligible, ranging from 0.02% to 0.36% for most materials. However, for material like a glass comprising of elements Te and La evaluated near their corresponding K-edge energies, the relative differences in MACs increased up to 1.46%. On the other hand, a comparison with MACs calculated based on EPDL97 (a predecessor of EPDL2017) revealed as much as a 6.61% difference. Also, it would seem that the changes in MACs were more evident in the materials composed of high atomic number elements evaluated at x-ray energies compared to materials composed of low atomic number elements evaluated at gamma-ray energies.

• 한국콘텐츠학회논문지
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• 제9권7호
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• pp.248-256
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• 2009

이 연구는 뇌성마비 아동의 손 기능을 평가하기 위해 개발된 손 기능 분류 체계(Manual Ability Classification System: MACS)를 이용하여 경직형 뇌성마비 아동의 손 기능을 평가하고 손 기능과 기능적 수행도 평가인 일상생활활동평가(Functional Independence Measure of Children: WeeFIM), 대운동 기능 분류체계(Gross Motor Function Classification System: GMFCS)의 관계를 알아보고, 이를 통해 뇌성마비 아동의 손 기능 평가 체계로써의 MACS에 대한 기초의 자료를 제공하는데 그 목적이 있었다. 경직형 뇌성마비 아동 60명을 대상으로 아동의 손 기능과 대동작 기능, 일상생활활동을 평가하였다. 평가한 자료를 바탕으로, MACS와 WeeFIM 및 GMFCS와의 관계와 손 기능 수준에 따른 일상생활활동의 차이를 알아보았다. 그 결과, MACS와 GMFCS의 상관은 유의수준.05에서 유의한 것으로 나타났으며, 그 정도는 r =.659이었다. WeeFIM과의 상관을 알아본 결과에서도 총점과의 상관은 유의수준.05에서 유의한 것으로 나타났으며, 그 정도는 r = -.576이었다. 손 기능 분류 체계로 평가한 수준에 따른 일상생활 활용의 차이를 알아본 결과 유의한 차이가 있는 것으로 나타났다(p <.05). 뇌성마비 아동의 손 기능 평가 도구로써 MACS는 임상적으로 유용한 평가 체계로 사용될 수 있음을 알 수 있다.

• 한국미생물·생명공학회지
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• 제46권4호
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• pp.334-345
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• 2018

Spore-forming Bacillus species are commercially available probiotic formulations for application in humans. They have health benefits and help prevent disease in hosts by combating entero-pathogens and ameliorating antibiotic-associated diarrhea. However, the molecular and cellular mechanisms of these benefits remain unclear. Here, we report the draft genome of a potential probiotic strain of Bacillus clausii B106. We mapped and compared the probiotic profile of B106 with other reference genomes. The draft genome analysis of B106 revealed the presence of ADI pathway genes, indicating its ability to tolerate acidic pH and bile salts. Genes encoding fibronectin binding proteins, enolase, as well as a gene cluster involved in the biosynthesis of exopolysaccharides underscored the potential of B106 to adhere to the intestinal epithelium and colonize the human gut. Genes encoding bacteriocins were also detected, indicating the antimicrobial ability of this isolate. The presence of genes encoding vitamins, including Riboflavin, Folate, and Biotin, also indicated the health-promoting ability of B106. Resistance of B106 to multiple antibiotics was evident from the presence of genes encoding resistance to chloramphenicol, ${\beta}$-lactams, Vancomycin, Tetracycline, fluoroquinolones, and aminoglycosides. The findings indicate the significance of B. clausii B106 administration during antibiotic treatment and its potential value as a probiotic strain to replenish the health-promoting and disease-preventing gut flora following antibiotic treatment.

• 한국언어정보학회지:언어와정보
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• 제17권2호
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• pp.29-50
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• 2013

Multiple Nominative Constructions (MNCs) and Multiple Accusative Constructions (MACs) have been some of the hottest and interesting topics in Korean syntax. This paper took empirical approaches to these constructions and examined native speakers' grammaticality judgements of these constructions. Though there are lots of previous studies on these constructions, Ryu (2010, 2013a, 2013b, 2013c) recently tried to unify MNCs and MACs into Multiple Case Constructions (MCCs) and to classify them into 16 types based on the semantic relations. This paper includes experiments which were performed on these 16 different types. The experiments were designed following Johnson (2008); and the native speakers' intuition was measured with two scales, numerical estimates and line drawing, though the latter was adopted in the actual analyses. Through the experiment, the following facts were observed: (i) the grammaticality of the MCCs varies depending on their semantic relations, (ii) MNCs were more grammatical than MACs if both constructions occurred in similar environments, and (iii) the sentences in some MAC types had much lower grammaticality than those in the others, as Ryu (2013b, 2013c) mentioned.

• 한국산학기술학회논문지
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• 제13권1호
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• pp.211-219
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• 2012

본 연구는 대동작 기능 분류 체계 확장판(GMFCS E&R)과 사물조작 능력 분류 체계(MACS)를 이용하여 뇌성마비 아동의 활동 제한을 알아보고, 뇌성마비 아동의 참여 영역에서의 제약 정도를 파악하여 활동 제한과 참여 제약 사이에 어떤 관계가 있는지를 알아보고자 시행되었다. 본 연구는 2010년 5월 1일부터 2010년 8월 31일까지 부산, 경남 지역의 병원과 복지관에서 재활치료를 받는 4세~12세 뇌성마비 아동 152명 대상으로 GMFCS E&R과 MACS를 이용하여 뇌성마비 아동의 활동 제한 정도를 평가하고, 뇌성마비 아동의 참여 제약에 대한 설문을 실시하였다. 본 연구의 결과는 SPSS 12.0 통계처리 프로그램을 이용하여 뇌성마비 아동의 활동 제한과 참여 제약 정도를 분석하고 활동 제한과 참여 제약 사이 상관관계를 분석하기 위해 Spearman 상관분석을 하였다. 본 연구 대상자의 활동제한에서 빈도가 가장 높은 GMFCS E&R 5 단계, MACS 5단계는 이동, 교육, 사회적 활동에 대해 심한 참여 제약이나 완전한 참여 제약이 있는 아동이 가장 많았다. 활동 제한과 참여 제약의 상관관계 분석 결과는 유의한 정적관계가 있음을 보였다. 따라서 본 연구를 바탕으로 참여 영역에서 뇌성마비 아동의 기능적 움직임에 대해 평가하고 중재 계획을 세우는 데 유용할 것이다.