• Korean Chemical Engineering Research
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• 제55권6호
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• pp.791-797
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• 2017

In this study, we optimized a method of PEO-PPO-PEO block copolymer embedding, for solving non-specific protein and biomolecular adsorption and high hydrophobicic surface property, which is widely known as problems of poly (dimethylsiloxane) (PDMS) that has frequently been used in basic biological and its applied research. We assessed its surface modification by controlling the concentration of embedded block copolymer, water-soaking time, and recovery time as variables by contact angle measurements. In order to evaluate its antifouling ability, adsorption of FITC-BSA molecules was quantified. Furthermore, we generated oil-in-water (O/W) emulsion as a proof-of-concept experiment to confirm that the optimized surface modification works properly.

• Korean journal of applied entomology
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• 제9권1호
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• pp.1-6
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• 1970

Cadmium pentachlorophenolxanthate has been synthesized with pentachlorophenol, carbondisulfide sodium hydroxide and cadmium chloride and its fungicidal activity was tested to Pyricularia oryzae and Cochliobolus miyabeanus. The results are summarized as followes; 1) The sample V synthesized by acidifying the crude PCP-xanthate solution at pH 8, then treated with $BaCl_2\;and\;CaC_2$ showed the highest purity, and the yield was $85.1\%$. 2) The same sample of $50\%$ wettable dust formulation inhibited conidial germination of P. oryzae and C. miyabeanus completely at 10 and 20 ppm, respectively. (Fig. 1) 3) The sample of $1.5\%$ dust formulation inhibited mycelial growth of P. oryzae and C. miyabeanus with 96 and $65\%$, respectively. The results were similar to those obtained by Ceresan calcium (Fig. 2) 4) Both dust and wettable powder formulations had no phytotoxcity on rice seedlings.

• Informatization Policy
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• 제19권4호
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• pp.83-104
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• 2012

Information sharing is one of the key factors enhancing government efficiency and public convenience. However, critics argue that Korean government is now facing various kinds of barriers such as insufficient collaboration among agencies, inappropriate statutes, and technical problems. Thus, this study aims to develop policy alternatives that help resolve the existing problems suggested above. In order to achieve research objectives, this study employs both quantitative and qualitative methods as ways to investigate different dimensions of information sharing in government. Both survey and interview include six dimensions such as organization, technology, culture, management, policy and law. The results show that Korean government needs to implement following alternatives; developing its own database that helps support government decision making, changing organizational culture, continuous extension in terms of the number of object information and affiliated agency, and developing a statute dealing with government information sharing.

• Korean Journal of Food Science and Technology
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• 제25권3호
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• pp.258-263
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• 1993

New type yoghurts were prepared by fermenting milk containing puffed rice flour(PRF) with some commercial lactic acid bacterial starters. The yoghurts were evaluated for pH, tillable acidity, viscosity and color with sensory evaluation for final quality. The optimum moisture content of rice for puffing was over or less 14%. Increasing addition level of PRF, lightness decreased and, redness and yellowness increased with increasing viscosity greatly. There was no quality difference among commercial starters but pH, acidity and viscosity of yoghurt were affected. During the storage at $5^{\circ}C$, pH dropped, acidity and viscosity increased gradually. The number of lactic acid bacteria was increased until 6 days storage to $3{\times}10^8$ and dropped after on. The yoghurt containing PRF was inferior in flavor texture and taste comparing with commercial yoghurt.

• The Journal of Industrial Distribution & Business
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• 제10권7호
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• pp.59-69
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• 2019

Purpose - Unlike in the past, individualistic thought is more dominant than groupism where members prioritize organizations. Such changes run counter to the direction of the survival of the companies, which calls for companies to explore strategies to address thems. As one of the solutions, many people highlights social capital. However, since most studies have been conducted on the definition and characteristics of social capital, there is not enough prior factor research on the formation of social capital. So the current situation require researches on the formation of social capital. Research design, data, and methodology - To achieve the purpose, the literature and the empirical studies were combined. Deriving workplace democracy and servant leadership as factors affecting the formation of social capital through the literature, and this factors have modeled assumptions about the impact on social capital, and have established hypotheses to verify them. The survey which is conducted to verify the hypothesis and questionnaires are derived base on the variables used in the previous studies. The survey was conducted 447 respondents in Korea. Results - As a result, we found that the workplace democracy is positively functioning with the formation of social capital. It means that the democracy functions as a universal element to enhance the quality of social capital at the workplace. The evidence also shows that the positive impacts of the servant leadership on the formation of social capital. And the survey shows that groups with high level servant leadership had a higher impact on the formation of social capital than those with low levels leadership. Conclusions - At present, the social capital has become an important factor for the companies pursuing high performance workplaces. We found that the workplace democracy and the servant leadership affect the formation of social capital. It means that to increase the employees' sense of community and solidarity, it is need to form democratic environment with the servant leadership. Therefore, based on the results of this study, the workplace democracy and the servant leadership can present strategic implications that can increase the social capital.

• Korean Journal of Fisheries and Aquatic Sciences
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• 제27권1호
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• pp.83-88
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• 1994

For the purpose of genetic stock indentification of three species of salmonid fishs and their hybrid, lactate dehydrogenase(LDH), malate dehydrogenase(MDH), isocitrate dehydrogenase(IDH), a-gylycerophosphate dehydrogenase(a-GPDH), malic enzyme(ME), 6-phospho-gluconate dehydrogenase(6-PGD), phosphoglucose isomerase(PGI) and phospho-glucomutase(PGM) from skeletal muscle, liver, heart and gill tissues in all three species were analyzed. Chum and masu salmon showed no polymorphic patterns in all isozyme loci, however rainbow trout were found to have polymorphic patterns at MDH-B, LDH and IDH loci. Especially, significant differences were found at MDH-B loci between the three species and the IDH patterns of rainbow trout were also different from the other two species. These loci therefore can be utilized as efficient genetic markers for the identification of hybrids and improve the efficiency of fish breeding. There was no difference except PGI between diploid and triploid isozyme patterns but PGI showed some potential as a marker for triploid in masu salmon.

• Geophysics and Geophysical Exploration
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• 제23권2호
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• pp.89-96
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• 2020

This tutorial summarizes the coordinate transforms for formulating geophysical problems. To ensure mathematical consistency, this discussion begins with the right-hand rule. Further, the concepts of active and passive transforms are introduced. By extending these concepts, the coordinate transform and its inverse between two coordinates are related to the matrix transpose. The yaw-pitch-roll rotation and the azimuth-deviation-tool face rotation transforms are described as the most frequently used schemes, and the relation between the Rodrigues' rotation formula and these two transforms are mathematically explained. The "Gimbal Lock" problem inherent in yaw-pitch-roll rotation is schematically presented and mathematically derived. As a useful tool overcome this problem, the principle and usage of the quaternion is also described.

• Journal of the Korean Institute of Telematics and Electronics S
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• 제35S권10호
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• pp.135-143
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• 1998

Several equalizers are applied to the DVD-ROM(Digital Versatile Disc-Read Only Memory) system. Because imperfect writing process may cause nonlinear distortion in the reply signal, neural equalizers which have strong nonlinear mapping capability are applied to the system to compensate the nonlinear distortion. Experimental results to verify that the combination of decision-feedback type equalizers and modulation code is formidable are also given. The experimental results shwo that the SNR gain of the neural equalizers over the conventional equalizers becomes much as the nonlinearity in the channel increases. Furthermore, the decision-feedback type equalizers outperform the equalizers which have no decision-feedback in eliminating ISI(Intersymbol Interference) of random data sequence but there is no performance gain of the decision-feedback type equalizers over the equalizers without decision-feedback when these are applied to compensate the ISI of modulation-encoded data sequence.

• Journal of the Institute of Electronics Engineers of Korea SP
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• 제48권1호
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• pp.157-165
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• 2011

It is challenging to detect foreground objects when background includes an illumination variation, shadow or structural variation due to its motion. Basically pixel-based background models including codebook-based modeling suffer from statistical randomness of each pixel. This paper proposes an algorithm that incorporates Markov random field model into pixel-based background modeling to achieve more accurate foreground detection. Under the assumptions the distance between the pixel on the input imaging and the corresponding background model and the difference between the scene estimates of the spatio-temporally neighboring pixels are exponentially distributed, a recursive approach for estimating the MRF regularizing parameters is proposed. The proposed method alternates between estimating the parameters with the intermediate foreground detection and estimating the foreground detection with the estimated parameters, after computing it with random initial parameters. Extensive experiment is conducted with several videos recorded both indoors and outdoors to compare the proposed method with the standard codebook-based algorithm.

• The Journal of the Korean bone and joint tumor society
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• 제3권2호
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• pp.119-126
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• 1997

From 1980 to 1997, we experienced 3 skip metastasis in femur out of 19 osteosarcoma patients. After diagnostic incisional biopsy and chemotherapy, hip disarticulations for all patients were performed. Still the mechanism of skip metastasis is unclear, but there have been two suggestions including medullary extension through an intraosseous embolism of tumor cells, or trans articular extension along the planes of fascia, capsule, ligaments, and venous channels around joints. The mechanisms of skip metastasis in our cases were not clear, but it was considered as an initial preliminary stage of metachronous osteosarcoma. If there are evidences of skip metastasis, it is strongly recommended to disarticulate proximal to the skip lesion rather than to amputate transmedullary.