• Proceedings of the Korea Water Resources Association Conference
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• 2021.06a
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• pp.258-258
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• 2021

본 연구에서는 다양한 크기로 구성되어 있는 부유사의 연직방향 농도 분포와 흐름 특성을 동시에 모의할 수 있는 1차원 유사이동 모형을 제시하였다. 하상재료와 부유사의 입도분포를 고려하기 위해 유사입자의 크기범위를 여러 계급구간으로 분할하였으며, 각 계급구간에서 입경별 한계소류력은 Shields의 무차원 관계식을 바탕으로 산정하였다. 수치모형의 검증은 실험실 실험자료와의 비교를 통해 수행하였다. 수집한 실험실 실험자료에서는 연직방향으로의 유속분포와 농도의 분포, 부유사의 입도분포가 모두 제공된다. 수치모의 결과로부터 부유사 계산 과정에서 대표입경을 가정하여 적용하는 경우에 비해 여러 계급구간을 분할하는 경우 수치모의 결과의 정확도가 향상되는 것을 확인하였다. 이러한 모의 결과는 이전의 연구사례에서 확인된 바 있다. 또한 하상으로부터의 거리가 멀어질수록 부유사의 입도분포가 양으로 왜곡되는 현상 또한 계산결과에서 확인되었다.

• 전기의세계
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• v.16 no.4
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• pp.36-40
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• 1967

절연계급의 변동은 설계조건에 여러가지 변동을 가져옴은 물론 제작공정의 사양에도 많은 변동을 불가피하게 한다. 이하 주로 제작방면에서 새로운 절연계급의 전동기를 제작할 때 특히 고려해야할 점들을 각 공정을 따라가며 검토하고자 한다.

• Korea Information Communication Reporters Association
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• s.6
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• pp.16-16
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• 2001

21세기 새로운 파워엘리트 계급으로 등장한 디제라티(디지털(Digital)와 지식계급(Literati)의 합성어)의 경우 지식을 매개로 전 세계에 막강한 영향력을 행사하고 있는데, 이는 지식이 새로운 부와 경쟁력의 원천이 되고 있음을 증명해주는 단적인 예이기도 하다.

• The Korean Journal of Applied Statistics
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• v.27 no.3
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• pp.357-371
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• 2014

There are many studies related to imbalanced data in which the class distribution is highly skewed. To address the problem of imbalanced data, previous studies deal with resampling techniques which correct the skewness of the class distribution in each sampled subset by using under-sampling, over-sampling or hybrid-sampling such as SMOTE. Ensemble methods have also alleviated the problem of class imbalanced data. In this paper, we compare around a dozen algorithms that combine the ensemble methods and resampling techniques based on simulated data sets generated by the Backbone model, which can handle the imbalance rate. The results on various real imbalanced data sets are also presented to compare the effectiveness of algorithms. As a result, we highly recommend the resampling technique combining ensemble methods for imbalanced data in which the proportion of the minority class is less than 10%. We also find that each ensemble method has a well-matched sampling technique. The algorithms which combine bagging or random forest ensembles with random undersampling tend to perform well; however, the boosting ensemble appears to perform better with over-sampling. All ensemble methods combined with SMOTE outperform in most situations.

• Journal of the Korean Geographical Society
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• v.36 no.4
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• pp.434-443
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• 2001

Differing from the existing method to optimize the statistical proximity, the new optimization method was developed to maximize the spatial proximity among the unit areas of choropleth map. 25 choropleth maps were made using 5 classification methods(maximum BEI, maximum TEI, equal interval, natural break, n-tile) for 5 classes(3∼7) and were analyzed to elucidate the effectiveness of classification methods on the basis of 3 evaluation indeces (TEI, BEI, $C_{F}$). The results from the maximum TEI and maximum BEI were evaluated as relatively stable and effective compared to those from other classification methods. But they showed the opposite trends owing to the trade-off relationships. Meanwhile, the resets from the natural break method got higher marks, which was also identified through the analysis using a new $alpha$-index.x.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.38C no.11
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• pp.966-971
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• 2013

This paper introduces development of a Military Entrance Control System using the developed military insignia UHF RFID tags. Generally, in the military entrance control system, the security identification (ID) card with HF RFID tag can be used, to increase the security level, the developed insignia UHF RFID tags are used in the enforced military entrance control system. The general metal insignias, have been worn on a hat or on the shoulder pads of a military uniforms, are simulated and developed as UHF RFID insignia tags. The military entrance control system can manage the name, rank, address (information of military personnel), time and date of entrance and the history of entrance of the security area.

• Korean journal of communication and information
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• v.68
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• pp.87-129
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• 2014

This paper addresses questions on the marginalized position of youths of 'Gangbuk' and elucidates how they construct their own identities in the individual trajectories of everyday life. Three years of research, including participatory observation and in-depth interviews, was conducted on nine students from Northeastern district of Seoul. The research also adopted reflexive photography interview method in order to encourage the informants to actively participate in the research. The result illustrates the diversity of the everyday life experiences. More 'marginalized' youths from middle to lower class background had to endure the burdens of their daily lives without programs. Still, they were elaborating their own cultural taste and positive self-narratives at the periphery of the mainstream culture, by practicing music, online community activities and bodily performances. They had to negotiate the crucial turn of life after their graduation, when they entered into the harsh social competition with limited resources. We observed how they gradually assimilate the identity of the 'working youth', some of them developing a positive valorization of their experiences labor. Findings underline the active role of the cultural practices in the making of class identity of the youth and the necessity of researches situating the making of class identity and the reproduction of the class for the youth in the larger geography of class culture in the contemporary Korean society. Lastly, it is argued that these youths should not be considered as determined subjects, who reproduce already established class identities, but as active agents of their lives who deserve more respects and attentions from the society.

• The Korean Journal of Ecology
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• v.28 no.5
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• pp.327-333
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• 2005

For the first time in Korea, plant size, distribution pattern and root growth form of Tamarix chinensis were surveyed at natural stand in Shiwha Lake, from June to July in 2005. T, chinensis grew in the range of 350 m towards north-south and 270 m in east-west direction. The mean number of stems germinated from same root system was 1.9. On the stem base, the numbers of living and dead plants were 1,398 and 114, respectively. Mean perimeter and height of 1,398 plants were $5.9{\pm}3.2$ cm and $159{\pm}51$ cm, respectively. By dividing into 10 classes based on the perimeter size, the largest number of plants were included in the second smallest class category. However, by dividing into 10 classes on the bases of plant height, variation in the number of plants along the height showed normal distribution curve. The heights of dead plants were small in perimeter but diverse in height. On the root base, the number of plants was the greatest in the smallest size class, and conspicuously decreased with size increment. Distribution of T. chinensis was clumped pattern. Age of the largest plant was 8-year. T. chinensis had two types of root growth. One was horizontal growth in the periphery of soil surface, and the other vertical growth.

• Journal of the Korean association of regional geographers
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• v.20 no.1
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• pp.49-69
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• 2014

The theory of creative city can be seen as one that reflects a relationship between recent change of economic environment and socio-spatial reconstruction in the so-called 'cultural turn' to deindustrialization. This paper considers approaching methods to knowledge-based economy or cultural economy as a context of development of theory of creative city, and suggests types of conceptualization of creative city. Then it reviews creative perspectives which can be found in recent domestic and oversea research trends on creative city, especially relating its nature with neoliberalism. Finally this paper discusses critically the concept of creative class as a social constitution of creativity or creative economy, and that of creative city as its spatial constitution. The concept of creative class can be criticized in terms of ambiguity of the concept of class, class-biased and economy-privileged idea, market valorization of culture, individualization against community, normalization of flexible labor market, and uncertainty of economic success of creative city. The concept of creative city can be criticized in terms of limitation of interests to city, ignorance of national and global dimensions, decontextual normative vision, legitimation of neoliberal city, lack of proof of causality between creative class and economic success, polarization of within and between cities.

• Journal of Korean Philosophical Society
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• v.142
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• pp.75-97
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• 2017

This study purpose is to discuss critically the conception of history in Hegel and Marx by drawing on Merleau-Ponty's existential theory of history, finishing with concluding remarks. Merleau-Ponty insists that history is always history experienced. This thesis is his own principle in investigating human history. From this perspective, he begins to flesh out problems with history which Hegel and Marx had understood idealistically and materialistically respectively. He criticised that if Hegel grasps history in terms of teleology, he failed to explain the source and origin of historical meaning from which history makes sense. He failed to think that what gives history meaning comes from embodied consciousness. This means that history is not made of dialectical thinking. The thing is different from such an imaginative construal. History as it stands is not like that. It is not running around like Hegelian dialectical thinking. Marx understood historical behavior wrongly when he explained class struggle in terms of productive relations. He disregarded how class was sedimented or embodied in the minds of proletarians. Owing to this, Marx could not suppose that class consciousness is determined not causally or externally but by incarnated experience. It is affected in so far as it is affected by somebody, that is, the worker. At that moment only Class consciousness begins to work. Marx did not catch sight of this hidden fact.