• 한국콘텐츠학회논문지
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• 제21권2호
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• pp.35-48
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• 2021

4차 산업혁명의 도래에 따라 물류 스타트업이 주도하는 생활물류 서비스가 급성장하고 있다. 이들은 물류 틈새시장에서 기존 물류 기업들과는 차별화되는 고객의 편의성 제고에 중점을 둔 서비스를 제공하고 있다. 모바일 앱을 구축하여 온디맨드, O2O(online to offline), 편의물류, 역물류, 라스트 마일 배송을 구현하고 있다. 물류 스타트업 주도로 소화물뿐만 아니라, 음식배달, 원룸 이사, 세탁물 배송, 출장 세차, 출장 자동차 정비 등 생활물류 서비스가 성장하고 있다. 생활물류 스타트업의 주요 성공요인 중 하나는 사용성이 높은 모바일 앱을 구축하여 고객의 충성도를 높이는 일이다. 평가는 개선을 위한 출발점이지만 모바일 앱의 사용성은 모바일 폰이 가진 특성 때문에 웹사이트와는 차별화된 평가기준을 마련하고 평가되어야 한다. 본 연구에서는 사용성 테스트 방법을 통하여 국내 대표적인 생활물류 모바일 앱의 사용성을 평가한 후 그 시사점과 개선방안을 제안한다. 그리고 구글 플레이의 최상위 인기 앱과 디자인 관점에서 비교한다.

• 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.

• 한국콘텐츠학회논문지
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• 제21권8호
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• pp.69-78
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• 2021

디지털 기술발전과 더불어 극장이 아닌 디지털 온라인 매체에서의 영화 수요와 공급이 지속적으로 증가하고 있다. 본 연구는 극장에 비해 다양한 영화가 상영되는 디지털 온라인 영화시장의 수요 집중화 경향을 분석하고자 한다. 2013년 1월부터 2019년 12월까지 TV VOD 자료에 대한 실증분석을 통해 다음의 결과를 확인하였다. 첫째, 극장개봉작 1,137편의 영화에 대한 분석을 통해 디지털 온라인 매체인 TV VOD 관람 수요에 비해 극장 관람 수요의 집중도가 상대적으로 더 높음을 확인하였고 이러한 차이가 통계적으로도 유의하게 나타났다. 둘째, TV VOD 수요 집중도 추이를 살펴보면, 시장에 공급되는 작품편수가 증가함에 따라 절대적 롱테일 지수에 해당하는 독립·예술영화(틈새 상품) 수요도 증가하는 추이를 보이지만 상대적 롱테일 지수인 독립·예술영화 수요 비중과 상위 1% 영화의 수요 비중의 경우 증가 또는 감소 추이가 뚜렷하게 나타나지 않았다. 셋째, TV VOD 수요 집중도와 TV VOD 시장규모 간에 통계적으로 유의한 관계가 있다고 보기 어려웠다. 본 연구는 우리나라의 디지털 온라인 영화시장의 특징을 파악할 수 있는 실증적 결과들을 제시하였다는 점에서 유용성을 가질 것이다.

• 정보관리학회지
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• 제39권2호
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• pp.35-60
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• 2022

이 연구는 도서관 이용자의 주의집중, 관련성, 자신감, 만족감(ARCS) 관점에서 본 4가지 동기 요인을 조사하여 이용자의 전문도서관의 동기적 이용을 탐색하였다. 전문도서관이 공공도서관에 비해 상대적으로 적은 관심을 받고 있지만 전문도서관은 현재 한국의 도서관 환경에서 지역사회의 정보 요구를 위해 공공도서관의 빈틈을 메울 수 있다. 개별인터뷰를 통해 질적 데이터를 모았으며 40명의 참여자가 프로젝트에 참여했다. 본 연구의 결과는 이용자가 전문도서관을 이용하기 시작하려는 방법으로 동기부여가 필요하다는 4가지 요인(ARCS)을 보여주었고 그것들을 통해 도서관에 대한 집중과 재방문을 유도할 수 있다는 것을 보였다. 또한 ARCS모델은 도서관 환경에서 전문도서관과 그 해당 서비스의 구현 적용 및 실행에 기여할 수 있다는 가능성을 보였다. 이 논문은 전문도서관의 동기적 ARCS모델 활용에 대한 지식을 넓히고 전문도서관을 위한 동기부여 전략 및 도서관 시스템 계획을 설계할 때 기초자료로 이용될 것으로 기대한다.

• Journal of Microbiology and Biotechnology
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• 제32권4호
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• pp.419-429
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• 2022

American ginseng (Panax quinquefolium L.) is a perennial herbaceous plant widely cultivated in China, Korea, the United States, and Japan due to its multifunctional properties. In northwest China, transplanting after 2-3 years has become the main mode of artificial cultivation of American ginseng. However, the effects of the cultivation process on the chemical properties of the soil and bacterial community remain poorly understood. Hence, in the present study, high-throughput sequencing and soil chemical analyses were applied to investigate the differences between bacterial communities and nutrition driver factors in the soil during the cultivation of American ginseng. The responses of soil nutrition in different ecological niches were also determined with the results indicating that the cultivation of American ginseng significantly increased the soluble nutrients in the soil. Moreover, the bacterial diversity fluctuated with cultivation years, and 4-year-old ginseng roots had low bacterial diversity and evenness. In the first two years of cultivation, the bacterial community was more sensitive to soil nutrition compared to the last two years. Proteobacteria, Actinobacteria, Gemmatimonadetes, Acidobacteria, Firmicutes, and Bacteroidetes dominated the bacterial community regardless of the cultivation year and ecological niche. With the increase of cultivation years, the assembly of bacterial communities changed from stochastic to deterministic processes. The high abundance of Sphingobium, Novosphingobium, and Rhizorhabdus enriched in 4-years-old ginseng roots was mainly associated with variations in the available potassium (AK), total phosphorus (TP), total potassium (TK), and organic matter (OM).

• Journal of Veterinary Science
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• 제23권4호
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• pp.62.1-62.10
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• 2022

Background: The corneal and limbal morphology relevant to corneal epithelial maintenance in ten different species was examined using histological methods. Objectives: The presence of a Bowman's layer, limbal epithelial cell, and superficial stromal morphology was examined in the following species to evaluate the differences in corneal thickness and epithelium: Java sparrows, frogs, macaws, spoonbills, red pandas, penguins, horses, Dobermans, orangutans, and humans. Methods: Corneal sections (4 ㎛) were obtained from ten ocular globes from three different animal classes: Aves, Amphibia, and Mammalia. All sections were stained with hematoxylin and eosin and periodic acid-Schiff reaction. After microscopy, all stained slides were photographed and analyzed. Results: Significant morphological differences in the corneal and limbal epithelia and their underlying stroma between species were observed. The number of corneal epithelial cell layers and the overall corneal epithelial thickness varied significantly among the species. The presence of a Bowman's layer was only observed in primates (orangutans and humans). Presumed supranuclear melanin caps were noted in four species (orangutans, macaws, red pandas, and horses) in the limbal basal epithelial layer (putative site of corneal epithelial stem cells). The melanin granules covered the apex of the cell nucleus. Conclusions: Supranuclear melanin capping has been described as a process within the epidermis to reduce the concentration of ultraviolet-induced DNA photoproducts. Similarly, there may be a relationship between limbal stem cell melanin capping as a protective mechanism against ultra-violet radiation.

• 한국환경과학회지
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• 제32권6호
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• pp.429-440
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• 2023

Quantitative habitat model is established with species occurrence and spatial abundance data, which were usually acquired by professional field ecologists and citizen scientists. The importance of citizen science data is increasing, but the quality of these data needs to be evaluated. This study aims to identify and compare both expert-based data and citizen science data based on the performance power of quantitative models derived from both data sets. A Maximum Entropy (MaxENT) model was developed using eight environmental variables, including climate, topography, landcover and distance to forest edge. The AUC values derived from the MaxENT model were 0.842 and 0.809, respectively, indicating a high level of explanatory power. All environmental variables has similar values for both data sets, except for the distance to forest edge and rice paddy, which was relatively higher for expert-based survey data than that of the citizen science data as the distances increased. This result suggests that habitat model derived from expert-based survey data shows more ecological niche including wider ranges from forest edges and isolated habitat patches of rice paddy. This is presumably because citizen scientists focuses on direct observation methods, whereas professional field surveys investigate a wider variety of methods.

• ALGAE
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• 제38권2호
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• pp.111-126
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• 2023

Mixotrophic dinoflagellates act as primary producers, prey, and predators in marine planktonic food webs, whereas exclusively autotrophic dinoflagellates are primary producers and prey. Species of the dinoflagellate genus Scrippsiella are commonly found in marine ecosystems and sometimes cause harmful red tides. Among the 28 formally described Scrippsiella species, S. acuminata has been found to be mixotrophic and two unidentified species have been found to be mixotrophic. To determine whether the other species in this genus are similarly mixotrophic, the mixotrophic ability of S. donghaiensis SDGJ1703, S. lachrymosa SLBS1703, S. masanensis SSMS0908, S. plana SSSH1009A, and S. ramonii VGO1053 was explored using 15 potential prey items, including 2-㎛ fluorescently labeled microspheres (FLM) and heterotrophic bacteria (FLB), the cyanobacterium Synechococcus sp., and various microalgal prey species. The ability of S. acuminata to feed on FLM and FLB was also investigated. We found that S. donghaiensis, S. lachrymosa, S. masanensis, S. plana, and S. ramonii did not feed on any potential prey tested in this study, indicating a lack of mixotrophy. However, S. acuminata fed on both FLM and FLB, confirming its mixotrophic ability. These results lowered the proportion of mixotrophic species relative to the total number of tested Scrippsiella species for mixotrophy from 100% to 29-38%. Owing to its mixotrophic ability, S. acuminata occupies an ecological niche that is distinct from that of S. donghaiensis, S. lachrymosa, S. masanensis, S. plana, and S. ramonii.

• Tuberculosis and Respiratory Diseases
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• 제86권4호
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• pp.294-303
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• 2023

Background: The human lung serves as a niche for a unique and dynamic bacterial community related to the development and aggravation of multiple respiratory diseases. Therefore, identifying the microbiome status is crucial to maintaining the microecological balance and maximizing the therapeutic effect on lung diseases. Therefore, we investigated the histological type-based differences in the lung microbiomes of patients with lung cancer. Methods: We performed 16S rRNA sequencing to evaluate the respiratory tract microbiome present in bronchoalveolar lavage fluid. Patients with non-small cell lung cancer were stratified based on two main subtypes of lung cancer: adenocarcinoma and squamous cell carcinoma (SqCC). Results: Among the 84 patients analyzed, 64 (76.2%) had adenocarcinoma, and 20 (23.8%) had SqCC. The α- and β-diversities showed significant differences between the two groups (p=0.004 for Chao1, p=0.001 for Simpson index, and p=0.011 for PERMANOVA). Actinomyces graevenitzii was dominant in the SqCC group (linear discriminant analysis [LDA] score, 2.46); the populations of Haemophilus parainfluenza (LDA score, 4.08), Neisseria subflava (LDA score, 4.07), Porphyromonas endodontalis (LDA score, 3.88), and Fusobacterium nucleatum (LDA score, 3.72) were significantly higher in the adenocarcinoma group. Conclusion: Microbiome diversity is crucial for maintaining homeostasis in the lung environment, and dysbiosis may be related to the development and prognosis of lung cancer. The mortality rate was high, and the microbiome was not diverse in SqCC. Further large-scale studies are required to investigate the role of the microbiome in the development of different lung cancer types.

• 한국해양학회지:바다
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• 제14권3호
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• pp.189-194
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• 2009

종속영양 와편의류인 Pfiesteria 종과 이와 유사한 형태의 Pfiesteria-like 종간의 생태적 지위차를 확인하기 위해, Pfiesteria piscicida, Cryptoperidininopsis brodyi, Stoeckeria algicida 3종에 전복유생(abalone larvae)을 투입하여 그들의 섭식 여부를 확인하고, 이들의 농도변화에 따른 전복 유생의 생존율 변화를 확인하였다. P. piscicida와 C. brodyi는 부화 1일차의 전복 유생을 직접 공격하여 치사 시킨 후 peduncle이라는 섭식기관을 이용하여 개체 전체를 섭식하는 것으로 밝혀졌다. 하지만 형태적으로 이들과 매우 유사하고 peduncle도 가진 S. algicida는 전복 유생을 직접 공격하거나 섭식하지 않았다. 전복 유생의 생존율은 P. piscicida와 C. brodyi의 초기 투입농도가 증가함에 따라 상대적으로 낮아졌다. 이러한 결과는 형태적으로 매우 유사한 종속영양성 와편모류일지라도 그들이 가지는 생태적지위는 매우 다르며, 보다 명확한 해양 생태계 먹이사슬을 이해하기 위해서는 종(species) 수준의 명확한 종 동정연구가 필요함을 제시해 준다.