• 한국도서관정보학회지
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• 제38권3호
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• pp.73-90
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• 2007

80대 20 법칙으로 알려진 "파레토 법칙"은 소수 정예의 핵심 시장 원리로 또는 선택과 집중의 경영 전략으로 그동안 해석되어 왔다. 그러나 웹 2.0 시대가 도래하면서 다수의 힘을 드러내는 롱테일 법칙이 새로운 비즈니스 화두로 부상하고 있다. 디지털과 온라인 시대를 맞아 이용자의 다양성에 대한 요구가 표출되기 시작하고 이를 충족할 수 있는 환경이 조성됨에 따라 롱테일 현상은 이제 사회 전반에 영향을 미치고 있다. 본 연구는 롱테일 현상을 도서관 서비스 측면에서 고찰하며, 웹 비지니스에서 제안되고 있는 다양한 롱테일 전략을 도서관 서비스에 응용해 본다. 또한 라이브러리 2.0의 철학과 기술을 활용한 실천 방안을 제안한다.

• 한국가금학회:학술대회논문집
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• 한국가금학회 2006년도 제23차 정기총회 및 학술발표회
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• pp.84-85
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• 2006

This study was carried out to ascertain phylogenetic status of long-tail chicken which found recently in Korea and was presumed to be a kind of Korean Natives. 10 loci microsatellites were analysed for 449 birds of 11 groups and 2 region of mitochondrial DNA were sequenced for 135 birds of the same groups, that consist of 3 introduced breeds and 8 Korean Natives including 3 long-tail chicken. In mean numbers of alleles per locus(MNA) for microsatellites, long-tail chicken were smaller (2.60${\sim}$3.20) than the others, but in heterozygosities, were higher(0.4087${\sim}$0.5375) than others that were the same level of MNA. And in the neighbor joining bootstrap tree drawing by Nei's standard distance, they made a cluster with some Korean Native groups. All of the nucleotide sequences of mitochondrial cytochrome b gene and D-loop were classified into 23 haplotypes. In long-tail chicken, the haplotypes were 3 kinds, and were different among the groups (LTA, LTB and LTD). Resultly, it was supposed that 3 groups of the long-tail chicken be all a kind of Korean Natives.

• 아태비즈니스연구
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• 제15권1호
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• pp.99-111
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• 2024

Purpose - This study aims to quantify the long tail effect in the digital economy. It also investigates the role of digital platform before and after the COVID-19 pandemic. Design/methodology/approach - We take advantage of a granular data set from one of the biggest digital platforms in Korea. Rather than computing the absolute number of products sold or the Gini coefficient, we estimate the slope of the log-linear relationship of the non-parametric sales distribution. Findings - We find that the use of online food order and delivery services is positively associated with individual restaurant's sales growth. We also document that the long tail effect is increasing over time. Long tail effects are clustered in the cross-section where average revenue per order is high or the restaurant belongs to the top 50% of the sales distribution. Research implications or Originality - The findings may indicate that digital platforms are contributing to the development of the digital economy in Korea. Also, we confirm that digital platforms make it possible for small and sole proprietors to go through the difficulties induced by the COVID-19 pandemic.

• 대한수학회지
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• 제40권1호
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• pp.87-107
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• 2003

In this paper, we consider a discrete time queueing system fed by a superposition of an ON and OFF source with heavy tail ON periods and geometric OFF periods and a D-BMAP (Discrete Batch Markovian Arrival Process). We study the tail behavior of the queue length distribution and both infinite and finite buffer systems are considered. In the infinite buffer case, we show that the asymptotic tail behavior of the queue length of the system is equivalent to that of the same queueing system with the D-BMAP being replaced by a batch renewal process. In the finite buffer case (of buffer size K), we derive upper and lower bounds of the asymptotic behavior of the loss probability as $K\;\longrightarrow\;\infty$.

• 융합정보논문지
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• 제10권11호
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• pp.117-130
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• 2020

본 연구는 웹툰 및 웹소설 기업인 카카오 페이지의 사례를 관찰하여, 문화 콘텐츠 산업 시장에서 롱-테일 전략과 기업의 역량과의 관계에 대해서 밝히고 있다. 본 연구는 카카오 페이지의 다양한 확장 전략에 대해 조사하였으며, VRIO 분석 방식을 통해 전략의 강점을 조사하였다. 카카오 페이지의 가장 큰 강점은 66,000개에 이르는 제품의 양이며, 롱-테일로서의 메리트를 얻게 할 뿐만 아니라, 수직적 통합과 다양한 확장 전략의 핵심이 된다. 이 연구는 시장에 접근하려는 플랫폼 콘텐츠 기업에게 다양한 제품을 확보할 역량이 필수적임을 지적함과 동시에, 콘텐츠 플랫폼 및 롱-테일에 관련한 후속 연구의 필요성을 촉구한다.

• 한국전자거래학회지
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• 제19권1호
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• pp.119-129
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• 2014

전자상거래 시장에서 롱테일 경제가 출현함에 따라 80/20 룰로 알려진 파레토 법칙의 일반적인 적용에 의문이 제기되고 있다. 이러한 제품 집중도의 변화는 인터넷 인프라 기반기술 위에 구현된 대량맞춤(mass customization)에서 기인한다고 예측된다. 본 연구는 그루폰과 유사한 소셜 커머스 웹사이트로부터 얻은 실거래 정보를 실증 분석하여 제품 및 고객 집중도를 분석하였다. 분석 결과, 이전 전자상거래 연구와 같이 소셜 커머스에서도 파레토 법칙과 다른 롱테일 패턴이 나타났다. 더욱이 email 또는 SMS를 통한 홍보가 판매 집중도 패턴에 영향을 미치는 것으로 파악되었다. email과 SMS를 통한 홍보는 모두 소셜 커머스 쿠폰 판매를 증가시킬 것이라는 예상과는 달리, SMS 홍보는 쿠폰 전반적으로 판매를 증가시키나, 소량 판매 제품의 경우 email 홍보는 오히려 제품 판매를 감소시키는 결과를 보였다.

• International Journal of Internet, Broadcasting and Communication
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• 제15권3호
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• pp.66-72
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• 2023

Little attention appears to have been paid to the relevance of learning a good representation function in solving long tail tasks. Therefore, we propose a new loss function to ensure a good representation is learnt while learning to classify. We call this loss function Triplet Class-Wise Difficulty-Based (TriCDB-CE) Loss. It is a combination of the Triplet Loss and Class-wise Difficulty-Based Cross-Entropy (CDB-CE) Loss. We prove its effectiveness empirically by performing experiments on three benchmark datasets. We find improvement in accuracy after comparing with some baseline methods. For instance, in the CIFAR-10-LT, 7 percentage points (pp) increase relative to the CDB-CE Loss was recorded. There is more room for improvement on Places-LT.

• 한국미생물·생명공학회지
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• 제18권3호
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• pp.221-226
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• 1990

Bacillu circulans F-2를 포함한 B.circulans의 prophage와 bacteriocin을 검출하기 위하여, mitomycin C를 처리하고 전자현미경상, plaque 형성능(plaque-forming activity), 세균세포살균능(killing activtiy)을 실험했다. killing activity 양성균으로부터 서당밀도균배원심(sucrose gradient centrifugation)을 통해 bacteriophage-like particle의 존재를 확인하였다. 이들 입자들은 형태학적으로 phage tail 또는 T4 phage와 닮은 구조를 가지고 있었다.

• Applied Microscopy
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• 제27권3호
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• pp.309-320
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• 1997

The spermatogenesis of korean leech, Whitmania edentula was observed, using both light and electron microscopes. The spermatogonium and maturing spermatozoon are connected with long cytoplasmic process to the cytophore, which supplys nutrition to the germ cells and supports synchronous maturity. The truck of korean leech is divided into three regions; a long ladder-shaped acrosome and head, long middle piece and long tail. Long head region twists to the dextral helix, and nuclei are surrounded with microtubules (manchette).The nebenkern formed with long mitochondrion exists in the middle pieces, and a long tail of Whitmania edentula ($9\times2+1$ axoneme) differs from the $9\times2+2$ axoneme of Rhynchobdellae. The late cytophore is mostly formed with crystalloid matter and a number of lysosomes, and matured spermatozooms are engulfed into the late cytophore.

• Journal of Species Research
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• 제8권3호
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• pp.259-267
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• 2019

Five free-living nematode species belonging to the order of Rhabditida are described for the first time in Korea. Two unrecorded species of Rhabditidae, Cruznema tripartitum (Linston, 1906) Zullini, 1982, and Poikilolaimus oxycerca de Man, 1895, and one species of Peloderidae, Pelodera strongyloides Schneider, 1860, were collected in Korea. C. tripartitum has nine pairs of genital papillae arranged in 2+2+1+4 differently from similar species of C. scarabaeum which has ten genital papillae arranged in 2+1+4+3. Poikilolaimus oxycerca has shorter tail (shorter than anal body diameter) compared to similar species of P. regenfussi which has longer tail(longer than anal body diameter). Pelodera strongyloides has shorter tail(1-1.5 times anal body diameters long) than P. punctata (4 anal body diameters long). Two unrecorded species of Panagrolaimidae, Panagrolaimus apicatus Schuurmans Stekhoven & Teunissen, 1938 and Panagrolaimus rigidus (Schneider, 1866) Thorne, 1937 were collected in Korea. P. apicatus has rounded and lower lip compared to similar species, P. margaretae Massey, 1964 which has finely pointed lip. P. rigidus has slender tail and lips rounded and flat barely separated when compared to similar species, P. subelongatus(Cobb, 1914) Thorne, 1937 which has plumper tail and lips are well separated.