• The Journal of Society for e-Business Studies
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• v.20 no.1
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• pp.23-43
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• 2015

Information and communications technology facilitates collaboration among individuals by functioning as an open platform for open collaboration projects. In this regard, this study aims to understand the network characteristics of participants who contribute greatly to open collaboration by investigating the mutual cooperation network in an open source project, which represents a form of open collaboration based on social network theory. To achieve this objective, this study analyzes the network centrality of developers with a high number of commits, particularly 8,101 developers in 782 repositories in GitHub, a representative open source platform. This study also determines how the relationship between network centrality and number of commits depends on the size of a repository network and the presence of a hub. Consequently, the number of commits by developers with high degree, betweenness, and closeness centrality is increasing. Among which, betweenness centrality has the highest explanatory power. Furthermore, when a hub is present and as network size increases, the relationship between the betweenness centrality of a developer and his/her number of commits continues to grow. This study is expected to provide suggestions for the successful performance of open collaboration projects in the future.

• Horticultural Science & Technology
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• v.19 no.3
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• pp.384-388
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• 2001

The selenium (Se) contents of 20 herbs, harvested in three areas in Korea, were analyzed. Many herbs had no Se. Angelica ($138.4{\mu}g \;Se{\cdot}kg^{-1}$ FW), caraway ($167.8{\mu}g \;Se{\cdot}kg^{-1}$ FW), chamomile ($116.6{\mu}g \;Se{\cdot}kg^{-1}$ FW), marjoram (158.7 and $132.6{\mu}g\;Se{\cdot}kg^{-1}$ FW), and oregano ($62.5{\mu}g\;Se{\cdot}kg^{-1}$ FW) accumulated Se as higher concentration compared with other plants. The Se content of herbs was dependent on the species, cultivars and areas. The status of Se uptake by herbs was investigated according to Se concentrations in hydroponics. During four weeks, before harvest of several herbs in greenhouse, sodium selenate ($Na_2SeO_4$) was added to the nutrient solution at concentrations of 2, 4, 6, and $8mg{\cdot}L^{-1}$. Field-mint accumulated Se too high, but external symptom of Se toxicity was not found. Essential oil content was generally proportionated to treated-Se concentration. The essential oil contents in basil and balm increased two to three times higher by sodium selenate treatment compared to non-treatment, but they did not show any linear relationship between essential oil contents and treated-Se concentration.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2018.04a
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• pp.99-99
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• 2018

본 연구는 4종의 산야초 추출물(개느삼, 엄나무, 참취, 60가지 산야초혼합 - 모두 원 식물재료를 설탕과 혼합하여 추출한 발효추출물을 15년 숙성시킨 원액의 3% 수용액으로 처리)과 8종의 허브 정유(베르가모트, 클라리세이지, 휀넬, 제라니움, 마조람, 타임, 로즈우드, 스페어민트 원액의 0.3% 농도로 처리) 및 2종의 호르몬(지베렐린, 카이네틴, 0.3%)을 2종의 보리종자(1998년산 새올보리, 2016년산 찰쌀보리) 발아율 향상에 영향을 미치는지를 알아보고자 수행하였다. 특히 새올보리 묵은 종자의 발아력 증진에 효과가 있는지 알아볼 목적으로 수행하였다. 묵은 종자 새올보리의 무처리구에서 8%와 43%의 낮은 발아세와 발아율을 보인 반면, 산야초 추출물 처리구에서 84~93%와 86~100%의 높은 발아세와 발아율을 보였다. 호르몬처리구는 새올보리에서 발아세와 발아율은 각각 43~87%와 55~95%였다. 또한, 찰쌀보리의 경우 무처리의 발아세와 발아율은 각각 54%와 91%였다. 반면, 산야초 추출물 처리구에서 92~100%의 발아세와 95~100%의 높은 발아율을 보였고, 호르몬 처리구에서는 각각 77~85%와 87%의 발아세와 발아율을 보였다. 무처리(증류수)와 2종의 호르몬 및 8종의 허브 정유에 비해 산야초 추출물의 발아 증진 효과가 현저하게 높았다. 특히 냉장고($4^{\circ}C$)에서 20년 보관한 묵은 보리종자에 대해서도 유의한 발아율 향상을 보였다. 정유는 대체로 발아를 억제하는 것으로 나타나 잡초 종자에 대한 발아억제(제초제 대용) 가능성을 시사한다.

• Food Science and Preservation
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• v.9 no.4
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• pp.400-405
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• 2002

Herbs are widely used as a source of tea and otherwise such as botanical medicine, essential oil for perfumes, cosmetics, and food spices. This study was carried out to investigate the characteristics of herb tea prepared with lavender, rosemary, mint, thyme and sage cultivated in korea. Approximate composition were as follows : crude protein 1.4∼17.5%, crude fat 6.1∼15.8%, sugars 43.5∼61s%, crude ash 7.7∼10.7%. Minerals contents of Ca ranged 707∼1763mg%, P 234 ∼513mg%, K 2,391∼3,430mg%, and Mg 361∼573mg%. Vitamins were $\beta$ -Carotene 6.9∼27.7mg%, B$_1$, 0.34∼0.62mg%, B$_2$1.37 ∼2.52mg%, niacin 5.3∼8.8mg%, and C 102∼111mg%. The changes of chromaticity a and b, pH, and sugar content of the herb tea at the different temperatures were decreased 80$\^{C}$ and 100$\^{C}$ in comparison to 60$\^{C}$ but increased chromaticity L. In the result of sensory test of the processed herb tea was more preferred than the market goods.

• Journal of Food Hygiene and Safety
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• v.34 no.2
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• pp.212-218
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• 2019

The process of establishing domestic standards on hazardous substances in food safety regulations requires harmonization with standards from the Codex Alimentarius Commission (CAC). For this purpose, food classification by the CAC (Codex Classification of Foods and Animal Feeds) also needs to be clearly understood. Therefore, this paper aimed to introduce the Codex Classification on cereal grains, nuts/seeds and herbs/spices because revisions of the Codex were completed in 2017 for cereal grains and in 2018 for nuts/seeds and herbs/spices. The revised Codex Classification on those foods is briefly summarized as follows. Cereal grains in the domestic food classification by the Ministry of Food and Drug Safety, Korea (MFDS) corresponds to the Codex Group 020 cereal grains with six subgroups. The MFDS's nuts and seeds classification corresponds to three groups in the Codex, namely, Group 022 (tree nuts with no subgroups), Group 023 (oilseeds and oilfruits with 5 subgroups), and Group 024 (seeds for beverages and sweets with no subgroups). The food commodities of herbs and spices are included in two Codex groups, Group 027 (with 3 subgroups) and Group 028 (with 9 subgroups). The number of Codex commodity codes assigned to food commodities was 27 for Group 020, 32 for Group 022, 46 for Group 023, 4 for Group 024, 127 for Group 027 and 138 for Group 028. In between the Codex Classification and the MFDS's classification, some differences are shown. For example, the MFDS did not create a subgroup under groups of cereal grains and herbs. The MFDS classified peanuts into the nut group, though a separate group for oilseeds is present, while the Codex classified peanuts into the oilseed and oilfruit group. In addition, there is also a separate group of "plants, others" present in the MFDS's classification. Therefore, care is needed in using the Codex Classification.

• The KIPS Transactions:PartA
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• v.13A no.1 s.98
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• pp.1-10
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• 2006

For efficient searching in unstructured peer-to-peer systems, random walk was proposed and several replication methods have been studied to compensate for the random walk's low query success rate. This paper proposes an efficient replication scheme that improves the accuracy and speed of queries and reduces the cost by minimizing the number of replicas and by utilizing caches. In this scheme, hub nodes store only content's caches, and one of their neighbors stores the replica. By determining hubs with only limited and local information, we can adaptively generate caches and replicas in dynamic peer-to-peer networks.

• Transactions of the Korean Society of Automotive Engineers
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• v.19 no.2
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• pp.72-77
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• 2011

In this paper, we propose effective diagnosis algorithm for hub bearing fault in driving vehicle using acceleration signal and wheel speed signal measured in hub bearing unit or knuckle. This algorithm consists of differential, envelope and power spectrum method. We developed diagnosis system for realizing proposed algorithm. This system consists of input device including acceleration sensor and wheel speed sensor, calculation device using Digital Signal Processor (DSP) and display device using Personal Digital Assistant (PDA). Using this diagnosis system, a driver can see hub bearing fault(flaking) from the vibration in driving vehicle. With early repairing, he can keep good ride feeling and prevent accident of vehicle resulting from hub bearing fault.

• Proceedings of the Korean Information Science Society Conference
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• 2007.10c
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• pp.169-174
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• 2007

분산 데이터를 상호 운용하기 위해서는 공유되는 정보가 효율적으로 처리 및 관리되어야 한다. 특히 레거시 시스템과 같이 이질성을 내포하고 있는 환경에서 협업을 위한 상호 운용성의 확보가 효율적인 관건이다. 따라서 본 논문에서는 레거시 시스템간의 데이터 공유 및 교환에서 발생하는 의미적 상호 운용성의 문제점을 극복하는 XMDR 메시지 기반의 하이브리드 에이전트를 이용한 데이터 허브 시스템을 제안한다. 이 시스템은 데이터 협업 시 실시간으로 변화는 데이터론 일관성 있게 유지하기 위해서 질의 변환 방법인 메시지 사상 기법을 제시하여 이용한다. 이는 레거시 시스템들 간의 협업에 필요한 데이터를 공유 및 교환하는데 실시간으로 변화하는 데이터를 일관성 있게 유지한다. 그리고 통합 검색시 단일 인터페이스를 제공하여 각 시스템의 독립성을 유지하면서 데이터의 투명성과 가용성을 향상 시킬 수 있다.

• Journal of the Society of Naval Architects of Korea
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• v.36 no.1
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• pp.37-46
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• 1999

The influence of the tip clearance upon the cavitation inception were investigated by experiments for ducted rotors having different tip clearances The axial and tangential mean velocities around the ducted rotors were measured using an L.D.V. system to investigate the correlation between tip vertex cavitation inception and hub vortex cavitation. Observation results for tip vortex cavitation and hub vortex cavitation show good agreement in trend with the analysis results of velocity measurement. An optimum tip clearance for ducted rotor was selected to delay the tip vortex cavitation.

• Journal of Bio-Environment Control
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• v.15 no.2
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• pp.190-195
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• 2006

The purpose of this study was to figure out the best condition in growth and sod quality of Mentha spp. according to cutting methods and soil depth. Applemint (M. suaveolens), Peppermint (M. piperita), and Spearmint (M. spicata) were used. Regardless of cultivar and soil depth condition, the growth rate in top cutting was higher than layering method. The difference between layering and layering without apical meristem was not significant. Optimal condition for growth was 5cm depth of soil. However, the shallower the depth of the soil, the better quality of sod. Among three Mentha species, M suavelens showed plant height and node number and M. piperita had shoot number were higher than other variety. The best condition of sod was top cutting and 1cm depth of soil regardless of cultivar.