• Korean Chemical Engineering Research
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• 제60권2호
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• pp.295-299
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• 2022

본 논문에서는 범퍼 스키드 플레이트 및 아웃사이드미러 하우징 부품에 적용되는 polypropylene (PP)와 acrylonitrile styrene acrylate (ASA) 소재를 활용하여 무도장 메탈릭 소재 구현에 대해 연구하였다. 금속 효과를 극대화하기 위해 알루미늄 입자의 종류, 크기, 함량을 최적화하였고 웰드 라인을 은폐하기 위해 종횡비가 상이한 하이브리드 알루미늄 입자를 사용하였다. 또한 부품 표면에 발생되는 플로우 마크를 개선하기 위해 유동성을 제어하였으며 사출 해석을 수행하였다.

• Biomolecules & Therapeutics
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• 제10권2호
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• pp.129-135
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• 2002

HM10411 is a recombinant granulocyte-colony stimulating factor (rG-CSF) that has been developing as a drug for neutropenia. In this study, antigenic potential of HM10411 was examined by active systemic anaphylaxis (ASA) in guinea pigs and passive cutaneous anaphylaxis (PCA) in guinea pig-guinea pig system. HM10411 was subcutaneously administered at 0,5, and 50 mg/kg and also as a suspension with adjuvant (50 mg/kg+FCA). Ovalbumin (OVA) as a suspension with adjuvant was used to induce positive control responses. In the ASA test, no symptoms except urination and evacuation that were considered as physiological phenomena were observed at 0 and 5 mg/kg. Two of 5 animals at 50 mg/kg showed sneering, dyspnea, or cyanosis. All animals in the adjuvant mixture group showed severe symptoms of anaphylatic shock and 3 of them died. In the PCA test, no antibody against HM 10411 was detected in the sera from the animals sensitized with 0 or 5 mg/kg. Only 1 serum sample from the animals immunized with 50 mg/kg showed positive reaction against HM10411, while all 5 sera collected from the HM10411 and FCA mixture group contained the HM10411-specific antibodies. These results suggest HM10411 is considered to have antigenicity In guinea pig.

• Archives of Plastic Surgery
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• 제41권2호
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• pp.116-121
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• 2014

Background Understanding risk factors that increase readmission rates may help enhance patient education and set system-wide expectations. We aimed to provide benchmark data on causes and predictors of readmission following inpatient plastic surgery. Methods The 2011 National Surgical Quality Improvement Program dataset was reviewed for patients with both "Plastics" as their recorded surgical specialty and inpatient status. Readmission was tracked through the "Unplanned Readmission" variable. Patient characteristics and outcomes were compared using chi-squared analysis and Student's t-tests for categorical and continuous variables, respectively. Multivariate regression analysis was used for identifying predictors of readmission. Results A total of 3,671 inpatient plastic surgery patients were included. The unplanned readmission rate was 7.11%. Multivariate regression analysis revealed a history of chronic obstructive pulmonary disease (COPD) (odds ratio [OR], 2.01; confidence interval [CI], 1.12- 3.60; P=0.020), previous percutaneous coronary intervention (PCI) (OR, 2.69; CI, 1.21-5.97; P=0.015), hypertension requiring medication (OR, 1.65; CI, 1.22-2.24; P<0.001), bleeding disorders (OR, 1.70; CI, 1.01-2.87; P=0.046), American Society of Anesthesiologists (ASA) class 3 or 4 (OR, 1.57; CI, 1.15-2.15; P=0.004), and obesity (body mass index ${\geq}30$) (OR, 1.43; CI, 1.09-1.88, P=0.011) to be significant predictors of readmission. Conclusions Inpatient plastic surgery has an associated 7.11% unplanned readmission rate. History of COPD, previous PCI, hypertension, ASA class 3 or 4, bleeding disorders, and obesity all proved to be significant risk factors for readmission. These findings will help to benchmark inpatient readmission rates and manage patient and hospital system expectations.

• 한국항행학회논문지
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• 제18권2호
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• pp.191-199
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• 2014

최근 IT 분야의 화두인 클라우드 컴퓨팅과 빅데이터 패러다임을 중소기업(Small and Medium Business: SMB) 차원에서 용이하게 활용하도록 지원하는 시도가 증가하고 있다. 이러한 노력의 일환으로, 본 논문에서는 프라이빗 클라우드 인프라 환경을 대상으로 하둡(Hadoop) 클러스터를 시험적으로 구축하는 프로토타입을 설계하고 구현한다. 프로토타입 구현은 싱글보드, PC, 그리고 서버를 이용하여 각각 수행하고, 그 성능을 테스트한다. 또한, ASA (American Standard Association) Dataset을 이용한 빅데이터 분석을 통해서 구축된 하둡 프로토타입을 활용하는 분석 소프트웨어 시스템의 성능을 통합적으로 검증한 결과를 제시한다. 이를 위해, R, 파이썬, D3, 자바와 같은 오픈소스를 이용하여 분석 소프트웨어 시스템을 구현하고, 테스트를 수행한다.

• 한국경영과학회:학술대회논문집
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• 한국경영과학회/대한산업공학회 2005년도 춘계공동학술대회 발표논문
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• pp.1020-1025
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• 2005

The set covering(SC) problem has many practical application of modeling not only real world problems in civilian but also in military. In this paper we study optimal allocation model for maximizing utility of consolidating old fashioned and new air defense weapon system like Patriot missile and develop the new computational algorithm for the SC problem by using simulated annealing(SA) algorithm. This study examines three different methods: 1) simulated annealing(SA); 2) accelerated simulated annealing(ASA); and 3) selection by effectiveness degree(SED) with SA. The SED is adopted as an enhanced SA algorithm that the neighboring solutions could be generated only in possible optimal feasible region at the PERTURB function. Furthermore, we perform various experiments for both a reduced and an extended scale sized situations depending on the number of customers(protective objective), service(air defense), facilities(air defense artillery), threat, candidate locations, and azimuth angles of Patriot missile. Our experiment shows that the SED obtains the best results than others.

• KIEAE Journal
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• 제13권2호
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• pp.151-156
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• 2013

This study examines the properties of spaces where historical and cultural resources have been preserved in the street system of Daegu Yakryeong market district, by using Space Syntax methodology. The results were obtained through ASA(Angular Segment Analysis) on each node (spatial unit) in the street network. An overall characteristic of spatial configuration in street system of the surveyed district is that nodes in the street network tend to form socially integrated spatial structure to allow easy access to each space in the system. There are a small number of socially isolated spaces in the street system, which are located at nodes in narrow streets adjacent to the roadway outside the district, or in narrow alleys between early modern Korean buildings. More than half of the surveyed spaces have high levels of social integration, which contain buildings playing a central role of the community, a traditional street market, symbolic landmarks. In conclusion, it is expected that the achievements of this study will contribute in leading to rational land use planning for sound and sustainable development of historical and cultural resources in an urban district.

• 한국가축번식학회지
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• 제17권1호
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• pp.13-19
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• 1993

We investigated the effects of CP-2 extracted from the mixture of Copis and Croton tiglium L, which showed very high cytotoxic effect to the various tumor cells, on the growth and steroidenesis of primary and transformed cell lines PA-GS6 and PO-GRS1 by cotransfectionwith SV40 and Ha ras oncogenes. CP-2 inhibited the growth of PA-GS6 and PO-GRS1 in a dose dependent manner when the growth of them was measured by cell number and by protein content, while CP-2 did not affect the growth of primary granulose cells. Productions of progesterone ofprimary and transformed granulosa cells were stimulated by forskolin, but this stimulatory effect was blocked by treatment of CP-2. Clinical application of CP-2 asa new anti-cancer drug and utilization of transformed granulosa cells as a model system for the screening of anti-cancer drug were also discussed.

• 한국통신학회논문지
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• 제21권6호
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• pp.1510-1521
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• 1996

본 논문은 주파수 선택적 이동통신 채널에서 RAKE 수신기를 위한 IS-95 DS/CDMA 시스템의 코드동기 및 개선된 검파기법을 제안한다. DS/CDMA 시스템은 다경로 페이딩 성분을 극복하기 위하여 RAKE 수신기를 사용한다. RAKE 수신기의 성능을 극대화하기 위하여 각 RAKE 브랜치에 정확한 PN 코드 오프셋을 제공하여야 한다. 본 논문의 코드동기 알고리듬은 다경로 페이딩 채널에서 RAKE 브랜치를 위한 PN 코드의 오프셋을 추정하는 알고 리듬이다. Monte Carlo 방법을 적용하여 실험을 행하였고, 동기시스템의 성능을 평가하기 위하여 평가척도로 검파확률 및 평균동기시간을 사용하였다. 그리고 적분시간, 도플러 주파수, 처리이득, 사용자수가 동기시스템에 끼치는 영향을 연구 분석하였다.

• 한국IT서비스학회지
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• 제14권3호
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• pp.197-215
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• 2015

Recently, many internet users are using cloud computing. Users can manage, store and share their data and information by using personal cloud storage. In this paper, we aim to figure out influencing factors on personal cloud storage selection. The causal relationship between factors were identified through a importance analysis by using AHP(Analytic Hierarchy Process). AHP is a structured technique for organizing and analyzing complex decisions, based on mathematics and psychology. Research model consists of upper factorsincluding system factor, service factor and user factor. 12 lower factors and 6 alternatives were also analyzed. Asa result, system factor of 3 upper factors was found as the most important factor. Purpose-coincidence, security andaccessibility were top 3 factors among lower factors. N drive showed top importance value. We also conducted ANOVAby classifying 4 groups according to gender, age, currently used cloud and cloud to use. The results of this researchcan be useful guidelines for cloud computing industry.

• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2008년도 춘계 종합학술대회 논문집
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• pp.480-483
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• 2008

다양한 인터넷 기술이 개발 및 발전됨에 따라 정보 제공자는 사용자에게 보다 효율적이고 고객중심의 서비스를 제공하기 위해 노력하고 있다. 특히 방대한 양의 정보에 대하여 고객이 원하는 정보를 정확하고 쉽게 제공하기 위해서는 검색기능의 효율성이 필수이다. 한국과학기술정보연구원(KISTI)에서는 국가과학기술포털서비스 성능향상을 위하여 FAST(Fast Search & Transfer ASA) 검색엔진을 도입하였다. 하지만 무엇보다도 서비스 환경에 적합하게 검색엔진의 하드웨어 및 소프트웨어적 성능을 최적화하는 것이 중요하다. 본 논문에서는 국가과학기술정보의 효율적 서비스를 위한 FAST 검색엔진 설계 및 최적화 기법에 대해 논한다.