• Title/Summary/Keyword: 풍성

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Probabilistic Reinterpretation of Collaborative Filtering Approaches Considering Cluster Information of Item Contents (항목 내용물의 클러스터 정보를 고려한 협력필터링 방법의 확률적 재해석)

  • Kim, Byeong-Man;Li, Qing;Oh, Sang-Yeop
    • Journal of KIISE:Software and Applications
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    • v.32 no.9
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    • pp.901-911
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    • 2005
  • With the development of e-commerce and the proliferation of easily accessible information, information filtering has become a popular technique to prune large information spaces so that users are directed toward those items that best meet their needs and preferences. While many collaborative filtering systems have succeeded in capturing the similarities among users or items based on ratings to provide good recommendations, there are still some challenges for them to be more efficient, especially the user bias problem, non-transitive association problem and cold start problem. Those three problems impede us to capture more accurate similarities among users or items. In this paper, we provide probabilistic model approaches for UCHM and ICHM which are suggested to solve the addressed problems in hopes of achieving better performance. In this probabilistic model, objects (users or items) are classified into groups and predictions are made for users considering the Gaussian distribution of user ratings. Experiments on a real-word data set illustrate that our proposed approach is comparable with others.

New Cultivars Multiplication of Oriental Raisin Tree (Hovenia dulcis var. koreana Nakai) by Veneer Grafting (절접에 의한 헛개나무(Hovenia dulcis var. koreana Nakai) 신품종(풍성 1, 2, 3호)의 증식)

  • Song, Jeong-Ho;Kim, Sea-Hyun;Kim, Hyeusoo;Kim, Moon-Sup
    • Korean Journal of Plant Resources
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    • v.27 no.2
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    • pp.183-187
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    • 2014
  • Hovenia dulcis var. koreana Nakai, the oriental raisin tree, has been considered not only fruit but an herbal medicine in East Asia including Korea, Japan and east China. As honey plant, value of this species had been rising steadily. The aim of this study was conducted to develop the propagation technique by scion collection time, scion age and vinyl house on survival rate of H. dulcis. The survival rate by veneer grafting showed no significant differences among 3 new cultivars. The scion collection at the northern temperature zone was observed to be the most appropriate time before the spring equinox when the plants are fully dormant. Especially, the installation of vinyl house showed 86% survival rate by veneer grafting. The scion age was effective 1 year shoot than 2 years shoot for increase the grafting survival rate. In this case, the installation of vinyl house can contribute above 80%.

On the Feasibility of Freak Waves Formation within the Harbor Due to the Presence of Infra-Gravity Waves of Bound Mode Underlying the Ever-Present Swells (Bound Mode의 외중력파에 의한 항내 이상파 생성가능성에 대하여)

  • Cho, Yong Jun;Bae, Jung Hyun
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.31 no.1
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    • pp.17-27
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    • 2019
  • We carry out the numerical simulation to test a hypothesis that freak waves can be triggered by the infragravity waves of bound mode underlying the ever-present swells and its constructive interaction with swells using the Tool Box called the ihFoam that has its roots on the OpenFoam, and Bi-spectrum. Numerical simulation is implemented for the SamChcuk LNG Plant where freak waves have been reported in front of the private wharf during its construction phase due to the uncompleted northern breakwater. Infra-gravity waves of bound mode is generated using the difference wave-wave interaction between the local wind waves of 7 s and a swell of 11.4 s based on the Bi-spectrum. For the sake of comparison, numerical simulation for infra-gravity waves of free mode is also carried out. Numerical results show that stem waves along the private wharf for SamChcuk LNG Plant can be triggered by the infra-gravity waves of bound mode coming from the north, which eventually leads to freak waves when encounters the reflected waves from the south jetty.

A Study on the Text of Conflict-Oriented Youth Play Education (배봉기 희곡에 드러난 청소년의 갈등 양상 연구)

  • Oh, Pan-Jin
    • (The) Research of the performance art and culture
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    • no.40
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    • pp.137-161
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    • 2020
  • In this article, I examined the conflict of youth reflected in Bae Bong Ki's plays based on theory of 'conflict'. Bae Bong Ki has been questioning the 'youth rights' in determining the content of performances, along with 'the magnetic field of college entrance examination' where most of the youth feel under huge pressure in his play. In the and , I focused on the students with the highest grade and the students with the lowest grade in the context of university entrance examination. Students who are struggling to keep the grades up are captured in this play as the educational reality of adolescents in distress. The situation of the top and bottom students is different, but both top and bottom students were too stressful to go to school. And 'the rights of the youth in deciding the content of the performance' in was a difficult topic because it collides with the right for the teacher to educate. It is expected that many plays will be created reflecting the conflict of youth in the future, and youth theater as well as discussions upon it will be enriched.

Impact of Coastal Forests on Geomorphological Changes of Coastal Dunes: A Case of the Sohawang-ri Foredune, Chungnam Province (해안사구 지형변화에 대한 해안림의 영향: 소황리 전사구를 사례로)

  • Kim, Yoonmi;Kong, Hak-Yang;Choi, Kwang Hee
    • Journal of The Geomorphological Association of Korea
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    • v.28 no.1
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    • pp.51-66
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    • 2021
  • This study shows that coastal sand dunes are negatively affected by coastal forests. In South Korea, planting pine trees on the dunes has been carried out to stabilize the dune landscapes and protect residential areas from coastal disasters since the 20th century. However, this strategy could reduce the resilience of dunes. In this study, we selected three monitoring sites with automated weather stations to compare the geomorphological and environmental characteristics between tree-covered and grass-covered dunes at Sohwang-ri, Boryeong-si, Chungnam Province for three years. In addition, we monitored the rates of erosion and deposition using eight pins along the dune crests. We found that the forest affected both wind velocity and direction, resulting in decreased blown sand supply to the dunes in front of the forest. The velocity of the strong winds faster than 5 m/s diminished to 10%-30% of the control sites, and the direction of northwesterly wind were skewed to the north by about 6°. Sand deposition occurred at about 15-20 m away from the pine forest and the amount was only 1/10 of the deposition within the grass-covered dunes. This study suggests that planting trees in coastal dunes is an undesirable strategy with negative impacts on the landscape management.

여성의 기업가정신이 창업성과에 미치는 영향: 경력단절여성창업자 대상으로 회복탄력성 조절효과검증

  • 길한나;김종성
    • 한국벤처창업학회:학술대회논문집
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    • 2023.11a
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    • pp.101-105
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    • 2023
  • 대한민국은 2017년 이후 저출산·고령화사회로 진입하였고 생산가능인구가 감소함에 따라 노동생산성이 낮아지고 있으며, 여성의 경력단절 문제가 심각한 사회문제로 대두되고 있다. 정부에서는 여성가족부와 고용노동부가 함께 여성의 경력단절 예방과 해결을 위해 다양한 지원창업과 경제활동을 장려하고 있지만 현실에서의 재취업장벽과 열악한 노동환경, 일과 가정의 양립 문제 등으로 인해 경력단절 여성들 특히, 고스펙·고학력의 여성들은 취업이 아닌 창업을 선택하고 있으나 창업의 성공률은 그다지 높지 않아 다양한 대비책이 요구되는 실정이다. 여성 기업가는 창업부터 성장하기까지 수많은 위험요소에 노출되어 있으며 이러한 위험요소를 체계적으로 관리하고 극복하는 노하우를 쌓아 잘 활용하였을 때 경제활동의 핵심주축으로 성장할 수 있으며 창업이라는 혁신적이고 생산적인 활동으로 전환해 일자리 창출 및 기업의 혁신과 나아가서는 국가경제발전에 기여할 수 있는 토대가 될 수 있다. 본 연구의 목적은 여성의 기업가정신이 창업성과에 미치는 영향을 실증 분석하는데 있다. 경력단절여성 창업자를 대상으로 기업가정신이 창업성과에 미치는 영향과 회복탄력성이 조절효과를 갖는지 여부를 확인하고자 하였다. 여성기업가 특유의 소비자의 욕구를 세심하고 활동적으로 파악하여 생활밀착형 아이디어가 풍성면모와 창조적인 아이디어를 갖고 적극적으로 실행해보고자 하는 진취적인 성향과 회복탄력성이 창업성과에 영향을 미칠 것이라는 상황에 초점을 두고 연구모형을 설정하였다. 이를 위해, 기업가정신의 구성요소를 '혁신성', '진취성', '위험감수성'을 독립변수로 구성하였고, 창업성과의 주요구성요소인 '재무성과', '비재무성과'를 종속변수로 설정하였다. 또한 회복탄력성을 조절변수로하는 연구모형을 상정하였고 이는 여성의 기업가정신과 창업성과의 관계에서 회복탄력성의 조절효과여부를 확인하여 여성의 기업가정신교육과 회복탄력성의 중요성을 밝히고 활성화를 목적으로 하고 있다. 본 연구는 여성의 기업가정신이 창업성과에 긍정적 영향을 미친다는 것을 규명했다는 점에서 시사점을 갖는다. 심각한 사회문제로 떠오르고 있는 여성의 경력단절 문제를 해소하기 위해 향후 중소벤처기업부 및 여성가족부, 고용노동부 등에서는 여성창업자를 대상으로 체계적인 기업가정신교육과 회복탄력성에 관한 교육을 시행할 것을 제언한다.

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Development of Probabilistic Models Optimized for Korean Marine Environment Varying from Sea to Sea Based on the Three-parameter Weibull Distribution (우리나라 해역별 해양환경에 최적화된 확률모형 개발)

  • Yong Jun Cho
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.36 no.1
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    • pp.20-36
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    • 2024
  • In this study, probabilistic models for the wave- and lifting forces were derived directly from long-term in-situ wave data embedding the Korean marine environment characteristics varying from sea to sea based on the Three-Parameter Weibull distribution. Korean marine environment characteristics varying from sea to sea carved out their presence on the probability coefficients of probabilistic models for wave- and lifting forces. Energetic wave conditions along the southern coast of Korea distinguish themselves from the others with a relatively large scale coefficient, small location coefficient, and shape coefficient around 1.3. On the other hand, mild marine environment along the western coast has a small variability, leading to small scale-coefficient, large location coefficient and shape coefficient around 2.0. In the sea off Mokpo, near the boundary between the South- and West Seas, marine environment was characterized by small scale-coefficient, large location coefficient, and shape coefficient around 1.2, implying that marine environments characteristics of the South-and West Sea coexist in the sea off Mokpo.

Reconstruction of Changes in Eolian Particle Deposition Across the Mid-Pleistocene Transition in the Central Part of the North Pacific (중기 플라이스토세 전이기 전후 북태평양 중앙 해역 퇴적물에 기록된 풍성 퇴적물 입자 퇴적 양상 변화 복원)

  • Lee, Sojung;Seo, Inah;Hyeong, Kiseong
    • Ocean and Polar Research
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    • v.41 no.4
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    • pp.275-288
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    • 2019
  • We investigated flux, grain size distribution, Nd-Sr isotope composition, mineral composition, and trace metal composition (REEs and Sc) of inorganic silicate fraction (ISF, mainly Asian dust with an unrestricted amount of volcanic materials) deposited during 600~1000 ka across the Mid-Pleistocene Transition at core NPGP 1401-2A (32°01'N, 178°59'E, 5205m) taken from the central part of the North Pacific. Our results reveal about a 2-fold increase in ISF flux after 800 ka, which is associated with an increase in La/Sc and a decrease in mean grain size. Asian dusts are finer than volcanic materials and La/Sc increases with the enhanced contribution of Asian dusts. Thus, increased flux after 800 ka can be explained by the increased contribution of Asian dusts relative to volcanic materials, likely due to an intensified Westerly Jet (WJ) and the drying of the Asian continent after the MPT. Mean grain size of ISF varies systematically in relation to glacial-interglacial cycles with a decrease during glacial stages, which is consistent with the previous results in the study area. Such a cyclical pattern is also attributed to the increase in the relative contribution of Asian dusts over volcanic components in glacial stages due to intensified WJ and drying of the Asian continent. Thus, it can be concluded that climate changes that had occurred across the MPT were similar to those of interglacial to glacial transitions at least in terms of the dust budget. Different from the Shatsky Rise, however, compositional changes associated with glacial-interglacial mean grain size fluctuations are not observed in Nd-Sr isotope ratios and trace element composition in our study of the Hess Rise. This may be attributed to the location of the study site far (> 4,000 km) from the volcanic sources. The volcanic component at the study site comprises less than 10% and varies within 3% over glacial-interglacial cycles. Such a small variation was not enough to imprint geochemical signals.

Erosion and Recovery of Coastal Dunes after Tropical Storms (태풍의 통과로 인한 해안사구 지형의 침식과 회복)

  • Choi, Kwang Hee;Jung, Pil Mo;Kim, Yoonmi;Suh, Min Hwan
    • Journal of The Geomorphological Association of Korea
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    • v.19 no.1
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    • pp.17-27
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    • 2012
  • Coastal dunes help stabilize the coastal landscape and protect the hinterland through dynamic interaction with sand beaches. Sometimes dune erosion occurs during the tropical cyclones, while dune recovery may naturally follow after the event. As the typhoon Kompasu passed through the Korean Peninsula early-September in 2010, it caused a rise in water in association with the storm, wave run-ups, and heavy rains in coastal areas. As the result, coastal dunes along the west coast of Korea were severely damaged during the storm. However, the degree and extent of erosion and recovery of dunes were found to be related with the condition of beach-dune systems including gradients of foreshore and front slope of the dune, sediment supply, vegetation, wind activity, and human interferences. Some dunes retreated landward more and more after the erosional event, while others recovered its original profile by aeolian transport processes mainly during the winter season. Vegetated dunes with pine trees were less recovered after the erosion than grass-covered dunes. In addition, dunes with artificial defense were more eroded and less recovered than those without hard constructions. According to the observation after the severe storm, it is likely that the sand transport process is critical to the dune recovery. Therefore, the interactions between beach and dune must be properly evaluated from a geomorphological perspective for the effective management of coastal dunes, including natural recovery after the erosion by storm events.

A Study on the Sudeok Choi-Ja's Study Viewpoint (수덕(樹德) 최자(崔滋)의 학문관)

  • Jeong, Seong-sik
    • (The)Study of the Eastern Classic
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    • no.67
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    • pp.237-258
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    • 2017
  • This study aims is consider the life and study viewpoint of Choi-Ja who lived in during the Musin regime of Koryo Dynasty. During this period, knowledge of the Confucian scriptures gradually generalized among scholars and writers. Therefore, it was possible to create an atmosphere that criticized sajanghak(詞章學). Choi-Ja regrets that people' reading style is not correct at the time. People are only trying to learn to participate in social exams and learn to read and write articles related to the Civil servant examination. Nevertheless, if he passed the Civil servant examination he criticized the government for failing to study harder, even though he had to work harder. Choi-Ja lamented that the intellectuals basically did not read about the Kyeongsabaekka(經史百家) and on the outward appearance. His scholarly attitude implies that he can be recognized as a genuine learningexperience when he forms the moral character of his inner self rather than his outward form. Choi-Ja' emphasis on six Confucian writings indicates that his virtues ere based on the Confucian spirit of Confucius. He pointed out the abuses of intellectuals at the time of his poems to build poems based on these Confucian traditions. He emphasized that the government ought to reflect on the Confucian scriptures and histories of the Confucian scriptures and reflect the politics of the people and improve the mood of the people.