• 방송공학회논문지
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• 제12권2호
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• pp.80-92
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• 2007

방송과 통신의 대표적 융합서비스인 IPTV 서비스는 네트워크 상에서 QoS 보장, 멀티캐스팅 효율성, 높은 대역폭이 요구된다. 전형적인 TDM 중심의 메트로 전송 네트워크는 안정적이고 복구가 가능한 방식으로 고정된 음성 트래픽을 전송할 수 있게끔 설계되었기 때문에 폭주 특성을 지니는 데이타 트래픽을 수용하기에는 병목현상과 대역폭 낭비의 단점이 있다. 그리고 고급 하이엔드 서비스와 Best Effort의 로우엔드 서비스를 분별하지 못하여 전송 네트워크에서는 모든 데이타를 동일하게 취급을 한다. 이러한 폭주 트래픽의 증가와 QoS를 근본적으로 해결하기 위해서는 무엇보다도 새로운 전송 네트워크 설계가 절실히 요구된다. 논문에서는 TDM 중심의 메트로 전송 네트워크를 패킷 중심의 전송 네트워크로 변화 방법을 제시하고 또한 패킷 중심의 전송 네트워크의 장점과 실효성도 함께 제시한다. 그리고 패킷 중심의 전송 네트워크인 Packet Transport System 방법에 관한 기술요소와 특징들에 대해서도 함께 제시한다. 연구결과 패킷 중심의 전송 네트워크인 Packet Transport System은 기존의 TDM 특성을 수용할 뿐 아니라 QoS, 멀티캐스트, 높은 대역폭의 수용으로 효과적인 대역폭 운용과 안정적인 패킷 전송성능을 가지고 있으며, 또한 광 경로 상의 장애 발생 시 트래픽의 생존성 확보를 위한 보호 메커니즘을 고려한 알고리즘을 통해서 각 서비스 클래스별 차등화된 QoS를 보장할 수 있다.

• 유통과학연구
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• 제18권5호
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• pp.99-109
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• 2020

Purpose: This study aims to develop and empirically analyze a research model in order to comprehend the relationship among the service quality of market-wholesaler system, re-transaction intention, and recommendation intention of forwarder. Further, we suggest new six factors reflecting the service quality of market-wholesaler system and highlight market expansion of forwarder as a mechanism in the relationship. Research design, data and methodology: The authors developed the new scales measuring the service quality of market-wholesaler system (i.e. trade price, price fluctuation, payment receipt, settlement period, trade information, and customer service) and conducted a cross-sectional survey for 439 forwarders in a wholesale market. And then we performed a series of path analyses to test hypotheses. The hypotheses are as follows. [H1] The service quality of market-wholesaler system will positively affect forwarders' market expansion, [H2] Forwarders' market expansion will positively affect their re-transaction intention, [H3] Forwarders' market expansion will positively affect their recommendation intention, [H4] Forwarders' re-transaction intention will positively affect their recommendation intention. Results: The results showed that all the six factors for the service quality of market-wholesaler system were positively related to market expansion of forwarders. There was a differential effectiveness in the six factors of the service quality. More specifically, the positive effect of customer service factor was the strongest on market expansion of forwarders. And the respective effects of trade price, price fluctuation, settlement period, trade information factors were followed in order. The positive effect of payment receipt factor was the weakest on market expansion of forwarders. Also, market expansion of forwarders was positively related to their re-transaction intention and recommendation intention. Furthermore, market expansion of forwarders was indirectly related to recommendation intention through re-transaction intention as well. Conclusions: The research findings provide important theoretical and practical implications. This study is the first to attempt to test the perception of forwarders for the service quality of market-wholesaler system by developing and using the new scales. Also, there has been a sharp controversy about the effectiveness of market-wholesaler system. The findings support that market-wholesaler system would be activated by empirically verifying the effectiveness of the service quality on the various outcomes.

• 한국태양에너지학회:학술대회논문집
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• 한국태양에너지학회 2012년도 춘계학술발표대회 논문집
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• pp.140-145
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• 2012

The purpose of this study is to understand the change of impression by comparing the uniformity lighting with the compound lighting. In previous study, we proposed a light controlling method to harmonize daylight from a window and artificial lights from a ceiling and obtained the results to support our method. We referred this method as the Adjusted Compound-Lighting Model (AC Model). The model claims that lighting in a room with a side-window are perceived as harmonious when the overall light distribution in the room is well approximated by a compound of lights from the window and the entire ceiling. The experiment is carried out with the scaled-models and mock-up spaces that were supposed to be an office space. One is lit by the uniform lighting and the other by the compound lighting in each experimental space. In order to present varying illuminance distributions, thetwo variables were used in this study. One was the ratio of thelight from the window and ceiling in the standard and evaluation box. The standard box was provided by the ratio of 20% to 40% from the window and 80% to 60% from the ceiling as two lighting ratio patterns [Wu20(=Cu80) and Wu40(=Cu60)]. And the evaluation box was provided by the light ratio of 0% to 40 from the window and 100% to 60% from the ceiling [Wcp0(=Ccp100), Wcp20(=Ccp80) and Wcp40(=Ccp60)]. The other variable was themean illuminance level in both boxes. Two level of mean illuminance (700lx and 300lx) were used in this experiment. Each lighting condition was established at equal horizontal mean illuminance level, held constant near 700lx or 300lx in both boxes. Both of them were similar in the shape of distribution when there were same ratios of lights from the window and the ceiling. Subjects were asked to evaluate the point of difference by semantic differential rating on their overall impression after comparing with two rooms. The results showed that the impressions of compound lighting were more positive score than that of uniformity lighting on the items of 'dim-bright', 'dislike-like', 'artificial-natural' and 'closed-open', and that there was no significant difference in impressions between two spaces on other items.

• Asian Pacific Journal of Cancer Prevention
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• 제16권8호
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• pp.3101-3109
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• 2015

Background: Methylenetetrahydrofolate reductase (MTHFR) is involved in amino acid synthesis and DNA function. Two common polymorphisms are reported, C677T and A1298C, that are implicated in a number of human diseases, including cancer. Objective: The association between MTHFR C677T and A1298C genotype and haplotype frequencies in risk for lung cancer (LC) was investigated in the Jordanian population. Materials and Methods: A total of 98 LC cases were studied for MTHFR C677T and A1298C polymorphisms, compared to 89 controls taken from the general population, employing the PCR-RFLP technique. Results: The frequency of the genotypes of MTHFR C677T among Jordanians was: CC, 59.6%, CT, 33%; and TT, 7.4% among LC cases and 49.4%, 40.2% and 10.3% among controls. No significant association was detected between genetic polymorphism at this site and LC. At MTHFR A12987C, the genotype distribution was AA, 29.5%; AC, 45.3%, and CC 25.3% among LC cases and 36.8%, 50.6% and 12.6% among controls. Carriers of the CC genotype were more likely to have LC (OR=2.5; 95%CI: 1.04-6; p=0.039) as compared to AA carriers. Smokers and males with the CC genotype were 9.9 and 6.7 times more likely to have LC, respectively ($OR_{smokers}=9.9$; 95%CI: 1.2-84.5, p=0.018; $OR_{men}=6.6$; 95%CI: 1.7-26.2, p=0.005). Haplotype analysis of MTHFR polymorphism at the two loci showed differential distribution of the CC haplotype (677C-1298C) between cases and controls. The CC haplotype was associated with an increased risk for lung cancer (OR=1.6; 95% CI: 1.03-2.4, p=0.037). Conclusions: The genetic polymorphism of MTHFR at 1298 and the CC haplotype (risk is apparently lower with the C allele at position 677) may modulate the risk for LC development among the Jordanian population. Risk associated with the 1298C allele is increased in smokers and in males. The results indicate that a critical gene involved in folate metabolism plays a modifying role in lung cancer risk, at least in the Jordanian population.

• 유통과학연구
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• 제17권4호
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• pp.59-68
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• 2019

Purpose - The purpose of this study is to examine the differential mediating effects of three dimensions of buyer trust in the influence of supplier characteristics on the relationship performance. In this study, transaction characteristics were classified into competences and assets. The corporate reputation is considered as intangible assets, the customer-linking capability is considered among the competencies and transaction specific asset is selected from tangible assets. This study is also to examine the moderating effect of technical environment uncertainty in the effects of integrity and benevolence on the intention to continue trading. This study aims to provide a guide on which dimension suppliers should manage and how to improve their trust in order to maintain business with companies in technical environment uncertainty. Research design, data, and methodology - The data for the empirical analysis of this study were obtained by interviewing the 274 purchasing managers of Daegu - Gyeongbuk small and medium enterprises. The items used in this survey were partially modified to fit the characteristics of the B2B industry. The reliability and validity of the variables were analyzed using SPSS 18.0 and AMOS 18.0 programs and hypotheses were verified through the structural equation modeling. Results - In this study, reliability was examined by Cronbach 'α test. Composite Reliability and Average Mean Variance extracted value exceeded the baseline values. As a result of hypotheses testing, the hypothesis that the transaction specific asset will improve the benevolence and that benevolence will improve the intention to continue the transaction were rejected and all the other 9 hypotheses were adopted include 2 moderating hypothesis. Conclusions - This study shows which dimension of trust suppliers should appeal to the buyer according to the uncertainty of the technology environment in order to maintain the transaction with the buyer. competence and integrity are important when technology environment uncertainty is low, and competence and benevolence are important when technical environment uncertainty is high. In order to improve competence, corporate reputation and transaction-specific asset are important. To improve integrity, corporate reputation and customer-linking capability are important. In order to improve benevolence, customer-linking capability is important. And various implications were discussed.

• 한국지능시스템학회논문지
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• 제20권2호
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• pp.165-172
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• 2010

임상 데이터마이닝에서 최적의 특징 집합을 선택하는 것은 주어진 데이터로부터 생성된 모델의 복잡성을 줄일 뿐만 아니라 유용성을 향상시키는 데에 매우 중요하고, 선택된 특징들의 임계값은 질병의 감별진단을 위해 임상 전문가의 결정기준으로 사용된다. 본 논문에서는 데이터의 공간적인 분포, 즉 중첩영역에서 중복 속성값을 포함하는 데이터의 분리성 정도를 평가함으로써 연속형 속성을 가진 데이터에 대한 퍼지 이산화기법을 제안한다. 제안된 방법에서 중복 속성값의 가중치 평균값은 각 특징의 임계값(즉 경계값)을 결정하기 위해서 사용되었고, 러프집합은 전체 특징들 중에서 중요특징들의 집합을 선택하기 위해서 이용하였다. 제안된 방법의 타당성을 검증하기 위해 호흡곤란을 주호소로 내원한 668명의 환자 데이터를 근거로 3가지 이산화방법과 제안된 이산화방법에 대한 실험을 수행하였다. 실험결과, 퍼지분할을 기반으로 한 이산화방법이 하드분할을 기반으로 한 이산화방법에 비해서 평균 분류정확도와 G-mean 성능에서 보다 좋은 결과를 제공함을 확인하였다.

• 한국산학기술학회논문지
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• 제17권1호
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• pp.468-473
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• 2016

본 연구는 디지털 측정기(Digital Force Gauge)를 이용해 급기가압 제연구역 출입문의 개방력을 측정하여 신뢰성을 검증하는데 있다. 개방력은 제연구역에 급기가압 기류가 들어가기 전과 후의 개방 부하를 측정하였다. 측정값은 미니탭 프로그램(Minitab PGM)의 AD(Anderson Darling) 통계분석법으로 신뢰도를 검증하였다. 분석된 P값은 제연설비의 작동 전과 후의 일부 층을 제외하고는 0.05 이상을 나타낸 것으로 보아 95% 신뢰도가 있는 것으로 해석된다. 측정값의 정규분포는 제연설비의 작동 여부와 관계가 없었으며, 계측기의 정밀도는 신뢰할 수 있는 것으로 분석된다. 그리고 급기가압 제연설비의 최적설계 조건은 계측기의 정밀도와 신뢰성, 측정자의 바른 자세, 출입문의 동일한 조건 등이 주요 인자로 판단된다. 따라서 급기가압 제연구역 출입문의 개방력의 측정은 디지털 측정기가 적합한 것으로 판단된다. 또한 효과적인 개방력의 측정은 측정자의 자세 표준화, 출입문의 초기 개방력의 설정 등이 주요 변수로 작용하고 있음을 알 수 있었다.

• 유통과학연구
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• 제17권1호
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• pp.95-103
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• 2019

Purpose - Recently, many theoretical researches suggested that arts-based marketing strategies provide many benefits for marketers to differentiate their brand or product from others. However, there has been little research focusing on consumers' response types from artwork (artifact-emotion appraisal; A-emotion vs. represented world-emotion appraisal; R-emotion). In order to deepen our understanding of arts-based marketing strategies, we addressed a research question related to how artwork-provoked consumers' emotional response can impact the perceived evaluation of art infused products. Research design, data, and methodology - To answer the research question, we conducted a pretest and one experimental study. The experimental study was 2(art-provoked response type: A-emotion vs. R-emotion) by 2(emotional valence: positive vs. negative) by 2(produce type: hedonic vs. utilitarian) mixed design. The art-provoked response type and emotional valence were between-subject design and product type was within subject design. For the experimental study, 108 undergraduate students and graduate students were randomly assigned to one of 4 conditions (A-emotion-positive, A-emotion-negative, R-emotion-positive, R-emotion-negative). Participants reported their evaluation of art-infused product and other items for a manipulation check. Results - The major results from the experimental study are as follow. First, participant's art-provoked response type influenced evaluation of art infused products differently. More specifically, the effect of emotional valence of artwork on product evaluation was not significant in A-emotion. However, in R-emotion, relative to the product with artwork provoked negative emotional valence, the product with artwork provoked positive emotional valence elicited significantly higher product evaluation. Second, product type also affected the art infusion effect significantly. Particularly, the differential effect of participant's art-provoked response type on product evaluation revealed when it is for a utilitarian product, but not for a hedonic product. Conclusions - Theoretically, the findings of this study expand academic research on art infusion. And the findings also can be extrapolated to generate lots of implication for marketers. In sum, when they plan art marketing strategies to build the favorable relationship with their customers, they need to consider customers' response type of an infused art and product type.

• 생명과학회지
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• 제31권1호
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• pp.52-58
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• 2021

키위에 세균성 궤양병을 일으키는 Pseudomonas syringae pv. actinidiae는 유전적 특성과 생산하는 독소에 따라 5개의 biovar (1, 2, 3, 5, 6)로 나누어진다. 그중 최근 전 세계적으로 유행하고 있는 biovar 3는 2011년부터 국내에서 분리되고 있다. RAPD 분석을 바탕으로 국내에서 분리된 biovar 3 균주는 6개의 subgroup (I, IV, V, VI, VII, VIII)으로 나누어진 바 있다. 본 연구에서는 차등되는 RAPD 밴드의 염기서열로부터 6개 subgroup 각각에 특이적인 SCAR primers를 개발하였다. 각 subgroup에 특이적인 이들 primers를 사용하여 2011-2017에 국내에서 분리한 biovar 3 균주들의 subgroup 분포를 조사하였다. 조사된 54개 균주 중 35개(64.8%)가 subgroup V에, 9개(16.7%) 균주가 subgroup IV, 4개(7.4%)가 subgroup VI, 3개(5.6%) 균주가 subgroup VII, 2개(3.7%)가 subgroup VIII, 그리고 1개(1.9%) 균주가 subgroup I에 속하였다. Subgroups IV, V 및 VI에 속하는 균주들은 각각 중국, 뉴질랜드, 칠레 균주와 연관이 있었다. 이 연구에 따르면 우리나라의 biovar 3 균주들은 유전적으로 다양하며 꽃가루를 통해 외국으로부터 유입된 것으로 추정된다.

• 대한영상의학회지
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• 제82권4호
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• pp.903-913
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• 2021

목적 악성 종양의 완전 관해 후 발생한 흉강 내 림프절병증 환자에서 사르코이드증 유사 반응을 시사할 수 있는 영상의학적 특징을 알아보고자 한다. 대상과 방법 이 연구는 악성 종양의 완전 관해 상태에서 발생한 조직병리학적으로 확인된 사르코이드증 유사 반응을 보인 5명의 환자의 임상적 특징과 CT 및 ¹⁸F-fluorodeoxyglucose(이하 FDG) PET/CT 소견을 분석하였다. 결과 기저 악성 종양으로는 유방암, 비인두암, 자궁내막암 및 림프종이 포함되며. 악성 종양의 완전 관해와 사르코이드증 유사 반응 진단 사이의 시간 간격은 6~78개월이었다. CT 소견으로는 양측 폐문 및 종격동 림프절병증(n = 5), 기관지혈관주위, 엽간열주위 또는 흉막하 폐결절(1~15 mm) 및 소엽내 간질비후가 포함되었다(n = 4). ¹⁸F-FDG PET/CT는 흉강 외 FDG 흡수 없이 양측 폐문 및 종격동 림프절의 대사항진을 나타냈다(n = 3). 모든 환자에서 코르티코스테로이드 치료 후 사르코이드증 유사 반응이 호전되었다. 결론 악성 종양의 완전 관해를 달성한 환자에서, 원발성 종양의 재발과 흉강 외 원격 전이 없는 상태에서 새로 발견된 양측 폐문 및 종격동 림프절병증은 림프관주위 폐결절의 유무에 관계없이 사르코이드증 유사 반응의 가능성을 시사할 수 있으며 불필요한 전신 화학요법을 예방하기 위해 림프절의 조직병리학적 확인이 필요하다.