• The Korean Journal of Malacology
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• v.29 no.3
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• pp.171-179
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• 2013

Arginine kinase (ArK) is known to play an important role in most invertebrates the level of ATP by phosphorylation of phosphagens in cell and immuninty in living organisms. ArK has been identified in many kinds of organisms ranging from invertebrate to vertebrate. However, no ArK gene has been cloned and investigated from N. samarangae. This leads us to identify ArK cDNA (NsArK) from the expressed sequence tag (EST) sequencing of N. samarangae. Sequence analysis indicated that the coding region of 1,065 bp contains 355 amino acid residues. Molecular phylogenetic analysis shows that NsArK had very high similarities with mollusca and arthropoda. In an attempt to investigate a potential role of NsArK in the digestive gland of N. samarangae, expression patterns were analyzed. RT-PCR analsysis shows that NsArK mRNA is induced in the rane of 1.2 fold at 6 hr by laminarin when compared with the control. The immunnologial and physiological role of NsArK remains to be further investigated in N. samarangae.

• Korean Journal of Plant Taxonomy
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• v.39 no.2
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• pp.63-73
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• 2009

$Iso{\ddot{e}}tes$ L. ($Iso{\ddot{e}}taceae$) is difficult to identify among the infrageneric taxa because of morphological simplicity. Since two species (I. japonica and I. coreana) had been reported, I. jejuensis and I. hallasanensis were described as two new species from Jeju Island, South Korea. The habitats of all species were confirmed by current studies except for I. japonica. We compared the morphological and anatomical characters of seven species, three domestic species and four species in adjacent regions (I. taiwanensis, I. sinensis, I. japonica, and I. asiatica). I. asiatica differs from other species in the lobe number of corm, spreading sporophylls, lack of stomata and degree of velum development. All of the seven species were identified by the characteristics of their mega- and microspores. Especially, it was possible to identify the four species in South Korea by the types of ornamentation on their megaspores. Each species has a specific type of megaspore ornamentation: I. coreana - cristate, I. jejuensis - rugulate, I. hallasanensis - echinate, and I. japonica - reticulate. We also discussed the phylogeny of the genus in East Asia in relation to recent studies based on the second intron of LEAFY sequence and amplified fragment length polymorphism (AFLP) analysis. We suggest strategies for the conservation of the endangered $Iso{\ddot{e}}tes$ species in South Korea.

• Journal of Korean Tunnelling and Underground Space Association
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• v.24 no.6
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• pp.637-658
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• 2022

TBM tunnel is simple with the iterative process of excavating the ground, building a segment ring-build, and backfilling. Drill & Blast, a conventional tunnel construction method, is more complicated than the TBM tunnel and has some restrictions because it repeats the inspection, drilling, charging, blasting, ventilation, muck treatment, and installation of support materials. However, the preparation work for excavation requires time and cost based on a very detailed plan compared to Drill & Blasting, which reinforces the ground and forms a tunnel after the formation of tunnel portal. This is because the TBM equipment for excavating the target ground determines the success or failure of the construction. If the TBM, an expensive order-made equipment, is incorrectly configured at the assembly stage, it becomes difficult to excavate from the initial stage as well as the main excavation stage. When the assembled shield TBM equipment is dismantled again, and a situation of re-assembly occurs, it is difficult throughout the construction period due to economic loss as well as time. Therefore, in this study, the layout and plan of the site and the assembly process for each major part of the TBM equipment were reviewed for the assembly of slurry shield TBM to construct the largest diameter road tunnel in domestic passing through the Han River and minimized interference with other processes and the efficiency of cutter head assembly and transport were analyzed and improved to suit the site conditions.

• Journal of Digital Convergence
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• v.19 no.10
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• pp.411-418
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• 2021

In this study, information search methods and user interface types provided to users were investigated for the top 100 e-commerce services selected by Statista and the National Retail Federation. And the characteristics of each type were derived by analyzing the interaction method of the user's manipulation with the visualization elements constituting the interface. The research results are as follows. First, as the information provision method, spread format was more often used as the number and hierarchy of information increased, and drop-down and mega menu methods were used more often as the number and hierarchy of information decreased. Second, as a visual classification method according to the information hierarchy, the background color, font change, and line were often used, and there were many cases where the background color and line were used at the same time. Third, there were various elements such as background color, text color, and line as an interaction method for user manipulation, and two or more of them were applied at the same time the most. This study is meaningful in that it defines the characteristics of each type through the analysis of the types of interfaces for e-commerce information search and items that can be the selection criteria for detailed elements.

• Review of Culture and Economy
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• v.20 no.1
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• pp.105-128
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• 2017

The purpose of this paper is to analyze the impact of distributors on the movie exhibition by distributor types. For the analysis, the concept 'screen elasticity of box office' is adopted. Using the weekly screening data of 94 hit movies released in Korea in 2014 and 2015, the panel analysis estimates the 'screen elasticity of box office' with the Hausman-Taylor estimator. The results show that the screen elasticity of box office is smaller for vertically integrated distributors(CJ E&M and Lotte Entertainment) and Hollywood distributors than the local distributors(Showbox and NEW) that do not own integrated cinemas. This means that exhibitors allocate a larger number of screens to vertically integrated distributors and Hollywood distributors. As the two distributor groups had higher market share during the period, the results imply that the screen elasticity is related to the market performance of distributors. Smaller screen elasticity of the vertically integrated distributors might be related not to the ownership to theaters but to higher market share of the distributors.

• Cross-Cultural Studies
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• v.44
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• pp.7-28
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• 2016

This study examines the sociocultural background of negritude by delving into Caseríos, Reggaeton, and $Trigue{\tilde{n}}os$, which are interrelated with the racism deeply embedded in Puerto Rican society. These terms have also been discussed in relation to the ideological discourse of racial democracy, which has caused Puerto Rican people to be blind to silenced inequality and hegemonic racial policies. Caseríos, housing projects for the poor urban class, are targeted by the state - sponsored project 'Mano Dura'. Due to the policing, control and surveillance of this anticrime project, Caseríos became perceived even more as residential communities of violence, poverty, and insecurity generally connected to the stigmatization of blackness. Reggaeton emerged as a mega hit genre of transnational Puerto Rican music in the 2000s, which in turn, drew attention to both the afrodiaspora in New York and the urban musical power in the Island. This musical genre serves to highlight the meaningfulness of black heritage in the national cultural identity of Puerto Rico. $Trigue{\tilde{n}}idad$ has recently become a common racial cultural term that embraces a broader racial paradigm of mestizaje. This term can function as an alternative concept of blackness, but it has not yet been transformed into enough cultural politics to resist ongoing racial democracy. The three terms intrinsically address both the uprooted racism and potential methods of challenging it. This paper argues the necessity of stronger and more responsive cultural politics to defy the pervasiveness and invisibility of racial discrimination in Puerto Rico.

• Journal of the Korean Recycled Construction Resources Institute
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• v.6 no.4
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• pp.289-296
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• 2018

In this study, we evaluated the feasibility and performance of LCD waste glass as a replacement for cement by using LCD waste glass powder which is generated from manufacturing process due to development of LCD industry. Experiments were carried out by replacing 10% and 20% cement of LCD waste glass with particle size of $12{\mu}m$ of LCD waste glass with OPC and particle size of $5{\mu}m$, respectively. Through experiments, basic properties, mechanical properties and durability of concrete were evaluated. Experimental results show that the compressive strength is high at 10% replacement ratio compared to 20%. The lower the particle size, the higher the strength. The durability test evaluated the chloride penetration performance through the chloride ion diffusion coefficient. The higher the substitution rate and the smaller the particle size, the lower the chloride ion diffusion coefficient and the better the OPC than the all substitution rate. As a result, LCD waste glass concrete with low granularity and proper replacement ratio is considered to be advantageous for durability under salt environment.

• The Journal of the Korea Contents Association
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• v.19 no.7
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• pp.335-347
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• 2019

China's 'One Belt and One Load' initiative is a mega-infrastructure project that connects China and the Eurasian Economies Area by overland and sea routes. Therefore, if it goes smoothly, It will be a new engine for economic development in China and the world, and It is expected to be a factor that will change the structure of the international economy. Especially, the Eurasian continent is likely to develop into the center of the global economy. But China's 'One Belt and One Load' initiative is not only macro and long-term, but also implies complexity, making it hard to be optimistic about development. China's 'One Belt and One Load' initiative is not only strongly promoted as a long-term national development strategy to be completed by 2049, but also strong economic complementarity between China and 'One Belt and One Load' consecutive countries. And many of the successive countries are expecting 'One Belt and One Load' construction. Therefore, there is no possibility at all. In particular, the possibility of development can not be completely ruled out, given the various policies of 'One Belt and One Load' currently being pursued by China. Even if it doesn't go smoothly, the process alone will have significant economic effects on China and neighboring countries, so it will be meaningful. With the help of information technology.

• Journal of Korea Port Economic Association
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• v.35 no.1
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• pp.139-162
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• 2019

In the case of Korea, policy support for shipping companies is limited, and the financial support should address the scale and period of support. Comprehensive measures are needed to boost the chances of reviving the industry. In order to secure competitiveness, the shipping companies need to make continuous efforts, prepare for the future by strengthening environmental regulations, and ensure that they have the ability to be flexible in their responses. The shipbuilding industry witnessed some improvement last year amid severe recession, but reforms are needed to address external and internal structural problems; further, to gain the characteristics of future leading industries, it is necessary to secure core technologies, as well as differentiated and specialized industrial competitiveness among rival countries through joint government intervention and joint R&D investment. Taking these steps will ensure that it has environment-friendly vessels and economic shipbuilding capabilities. The competitiveness of Busan Port should enable the utilization of the geopolitical characteristics of East Asia and contribute to: regional economic revitalization; development of its status as hub port; and securing the position of developed countries in East Asian logistics. For this purpose, it is necessary to establish a strategy to: expand the usability of shipowners/carriers; improve the quality of port operations; improve the portability of the smart system; expand the port of mega-ocean carriers; speed up port operations; and create low-cost ports. The establishment of a network of four countries will also require long-term global linkages. For example, there is a need to establish a logistics network between Eurasia and the European region, which will use the Russian Land Bridge System, as well as that of China.

• Journal of the Economic Geographical Society of Korea
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• v.22 no.3
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• pp.258-273
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• 2019

Bilbao, Spain, made a mark as a example of the regional revitalization by culture and tourism. Korean Government have a perspective that culture and tourism could be an alternative to the regional crisis of manufacturing in 2018. The main purpose of this study is to analyze the locational specificity and the revival strategies for the regional development of Bilbao in a structural context. This could provide implications to the regional crisis of Korea. The main results are summarized as follows. Firstly, the local government of Bilbao has taken an active role, using not only its political and financial autonomy but also its locational advantage as an important nodal region of transnational trade networks in Europe. Secondly, Bilbao was able to sustain its regional revitalization initiatives for a long period by facilitating public-private partnership system. Finally, despite the effectiveness of the mega project and place marketing, low job security and the polarization of the service sector have emerged as a problem at the same time. Still, the deindustrialization of Bilbao could be possible due to the various services including knowledge-based services and financial services as well as culture and tourism.