• Journal of the Korean Institute of Navigation
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• v.19 no.4
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• pp.103-121
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• 1995

As Daniel Bell says, that modern society is an information society. In contrast to earlier days, modern society has placed a high value on information and knowledge. Therefore, modern civilization depends largely on information and knowledged, which is the most valuable sources of all intelligence activities. By coordinating a large number of human action, the information creates a powerful social tool. It combines its personnel with its resources and new materials at various level. At the same time, It continually evaluates how well it is performing and tries to adjust itself accordingly in order to achieve social goals. As we shall see, all this allows information to sew the various needs of society. In connection with above mentioned problem consciousness, the study is designed to sew the following purposes. As its title indicates, and perhaps most significant. This study is to review and reinterpret the existing literature on local telecommunication system, networks, and policy direction in order to arrive at a somewhat more general approach to understanding them. In local telecommunications service, the service exploitation and promotion and database development must be accomplished by establishing local telecommunications. If we develop local telecommunications toward the progressing direction, we would dissolve the regional information disparity and could also make the local policy suited for high-intelligence society. It is true of any science that knowledge is never complete. It is also true of a science that knowledge should grow, through systematic reexamination of the body of findings. There are certainly true of this study on the developmental direction for local telecommunication system.

• Journal of architectural history
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• v.10 no.2 s.26
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• pp.85-99
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• 2001

Jong Soung Kim is a rare architect in Korea who has consistently done research on the idea of the architectural technology for a long time. Therefore in order to understand Kimm's architecture, it is essential to examine his idea on the technology, which reveals the complicated relationship between divers architectural discourses. It is concerned with tectonics which was the most important theoretical movements in German architecture from the nineteenth century, the Mies van der Rohe's idea of the technology which provided the most powerful basis of modern architecture, Miesians' technological discourses which was at the height of prosperity in seventies in America, and High-tech architecture in eighties. Kimm's idea on the technology is defined as follow; 1) Kimm believe that although architecture begins in construction and materiality, it must culminate in artistic form. It's legacy of German tectonics. 2) He accepts Mies' three ideas on the technology. 'Architecture is the spatially apprehended will of the epoch.' 'Technology reveals the true nature of the will of the epoch.' 'We can attain a new beauty with the help of a new technology' 3) He takes a double attitude toward the idea on the technology of Mies followers. He accepts their architectural achievement according to technological progress, but criticize their technology-oriented attitude, deprived of spiritual enrichment. 4) Kimm's idea on the technology is distinguished from that of High-tech architect. The principal criteria exist in their different attitude toward the anonymity and the ethics of technology.

• Preventive Nutrition and Food Science
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• v.16 no.4
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• pp.321-327
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• 2011

Water, methanol and ethanol extracts of ginseng leaves were assayed for total phenolics and flavonoids, ascorbic acid, cupric and ferrous ion chelating activities, 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity, ferric reducing antioxidant power (FRAP) assay and ABTS radical cation decolourization (TEAC) assay for their antioxidant properties. The ethanol extract of ginseng leaves contained significantly (p<0.05) higher amounts of total phenolics and flavonoids (600.57 and 1701 mg/100 g) than methanol (374.43 and 1512.64 mg/100 g) and water extracts (248.30 and 680.05 mg/100 g). Among solvent extracts of ginseng leaves, the ethanol extract showed the most powerful antioxidant activities. However, the ferrous ion chelating activity of ginseng leaf extracts were lower than the cupric ion chelating ability. These differences in concentrations of key antioxidants among various solvent extracts seemed to be responsible for their differences in antioxidant activities. These results suggest that ethanol extract of ginseng leaves has the most effective antioxidant capacity compared to the methanol and water extracts tested in the present study. Thus, it can be applied for the effective extraction of functional material from ginseng leaves for the usage of pharmaceutical and/or food industries.

• Proceedings of the Korean Society for Bioinformatics Conference
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• 2004.11a
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• pp.221-233
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• 2004

Molecular docking falls into the general category of global optimization problems since its main purpose is to find the most stable complex consisting of a receptor and its ligand. Conformational space annealing (CSA), a powerful global optimization method, is incorporated with the Tinker molecular modeling package to perform molecular docking simulations of six receptor-ligand complexes (3PTB, 1ULB, 2CPP, 1STP, 3CPA and 1PPH) from the Protein Data Bank. In parallel, Monte Carlo with minimization (MCM) method is also incorporated into the Tinker package for comparison. The energy function, consisting of electrostatic interactions, van der Waals interactions and torsional energy terms, is calculated using the AMBER94 all-atom empirical force field. Rigid docking simulations for all six complexes and flexible docking simulations for three complexes (1STP, 3CPA and 1PPH) are carried out using the CSA and the MCM methods. The simulation results show that the docking procedures using the CSA method generally find the most stable complexes as well as the native -like complexes more efficiently and accurately than those using the MCM, demonstrating that CSA is a promising search method for molecular docking problems.

• Bulletin of the Korean Chemical Society
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• v.35 no.12
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• pp.3627-3631
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• 2014

In this study we examined two ester-containing cross-links, hex-2-enyl acetate and hex-2-enyl propionate, as new cross-linking systems for helix stabilization of short peptides. We demonstrated that these hexenyl ester cross-links can be readily installed via a ruthenium-mediated ring-closing metathesis reaction of L-aspartic acid 4-allyl ester or L-glutamic acid 5-allyl ester at position i and (S)-2-(4'-pentenyl)alanine at position i+4 using second generation Hoveyda-Grubbs catalyst at $60^{\circ}C$. Between these two cross-links, we found that the hex-2-enyl propionate significantly stabilizes the ${\alpha}$-helical conformations of short model peptides. The helix-stabilizing effects of the hex-2-enyl propionate tether appear to be as powerful as Verdine's i,i+4 all-hydrocarbon stapling system, which is one of the most widely used and the most potent helix-stabilizing cross-linking systems. Furthermore, the hex-2-enyl propionate bridge is reasonably robust against non-enzymatic hydrolytic cleavage at a physiological pH. While extended studies for probing its chemical scopes and biological applications are needed, we believe that this new helix-stabilizing system could serve as a useful chemical tool for understanding protein folding and designing conformationally-constrained peptide drugs.

• Bulletin of the Korean Chemical Society
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• v.35 no.12
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• pp.3547-3552
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• 2014

Laser Raman spectroscopy is one of the most powerful technologies for standoff detection of hazardous materials including explosives. Supported by recent development of laser and sensitive ICCD camera, the technology can identify trace amount of unknown substances in a distance. Using this concept, we built a standoff detection system, in which nanosecond pulse laser and nanosecond gating ICCD technique were delicately devised to avoid the large background noise which suppressed weak Raman signals from the target sample. In standoff detection of explosives which have large kill radius, one of the most important technical issues is the detection distance from the target. Hence, we focused to increase the detection distance up to 54 m by careful optimization of optics and laser settings. The Raman spectra of hazardous materials observed at the distance of 54 m were fully identifiable. We succeeded to detect and identify eleven hazardous materials of liquid or solid particles, which were either explosives or chemical substances used frequently in chemical plants. We also performed experiments to establish the limit of detection (LOD) of HMX at 10 m, which was estimated to be 6 mg.

• Journal of the Korea Society of Computer and Information
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• v.22 no.3
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• pp.123-129
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• 2017

This study intends examine the relevance of factors with negative influences on anti-social sexual awareness formation in adolescents as per the concern of the parents of families with adolescents, as internet pornography exposure in adolescents lead to excessive indulgence in pornographic photographs, cartoons, videos, or fictions, or in video chatting with exposure of one's own body parts. For this, the factors of internet pornography exposure in the study subjects of adolescents were constructed into a multilateral model, and the structural equation model was analyzed. As the result of the study, the following conclusion were drawn. First, the most powerful factor influencing the anti-social sexual awareness in adolescents was, contrary to the concern of many, not the exposure to pornography through internet media, but personal characteristics such as sensation-seeking tendency and socio-environmental characteristic of differential association. Second, it is worth noting that the most major factor influencing intentional internet pornography exposure by adolescents is another form of pornography exposure. Third, whether intentional or unintentional, the internet-related variable influencing the internet pornography exposure was found to be the amount of internet usage. Fourth, the unintended internet pornography exposure was found to have no direct influence on the sexual awareness of adolescents, but it did have an indirect influence on sexual awareness mediated by intentional internet pornography exposure and existing-media pornography exposure. Based on these study results, the conclusion was drawn regarding the influence of internet pornography on sexual awareness in adolescents.

• Journal of the Korean Society of Clothing and Textiles
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• v.19 no.3
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• pp.525-535
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• 1995

This study was designed to verify the clothing satisfaction according to product type (jacket vs. pantyhose) and consumer fashion involvement. Research problems were as following; 1. To identify a clothing satisfaction according to product type. 2. To discover which of satisfaction relevant variables has the most influence on clothing satisfaction. 3. To examine the relationship between expectations and discontinuations. 4. To examine the degree of influence of product type and consumer fashion involvement on expectations. The survey was carried out in Pulsar shopping area. The 104 subjects (51 for jacket, 53 for pantyhose) participated in the final analysis. The results of analysis were as following; 1. The main path of clothing satisfaction was that the product type -1 the expectations -1 the perceived performance (-1 the discontinuation) -1 the clothing satisfaction. Those relevant variables explained 62% of clothing satisfaction variance. The most powerful determinant was the perceived performance. 2. For jacket type, the influence of perceived performance appeared to be greater than that of the discontinuation. And the consumer fashion involvement affected the expectations and the discontinuation. 3. For pantyhose type, the consumer fashion involvement divan't affect the expectations. The influence of discontinuation was relatively higher than that of jacket type.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.11 no.7
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• pp.3608-3628
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• 2017

Several block cipher modes of operation have been proposed in the literature to protect sensitive information. However, different security analysis models have been presented for attacking them. The analysis indicated that most of the current modes of operation are vulnerable to several attacks such as known plaintext and chosen plaintext/cipher-text attacks. Therefore, this paper proposes a secure block cipher mode of operation to thwart such attacks. In general, the proposed mode combines one-time chain keys with each plaintext before its encryption. The challenge of the proposed mode is the generation of the chain keys. The proposed mode employs the logistic map together with a nonce to dynamically generate a unique set of chain keys for every plaintext. Utilizing the logistic map assures the dynamic behavior while employing the nonce guarantees the uniqueness of the chain keys even if the same message is encrypted again. In this way, the proposed mode called SPCBC can resist the most powerful attacks including the known plaintext and chosen plaintext/cipher-text attacks. In addition, the SPCBC mode improves encryption time performance through supporting parallelized implementation. Finally, the security analysis and experimental results demonstrate that the proposed mode is robust compared to the current modes of operation.

• 한국전산유체공학회:학술대회논문집
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• 2011.05a
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• pp.387-391
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• 2011

Since MEMS based micro actuators or generating devices have high efficiency per volume, plenty of research are ongoing. Among them, MEMS based millimeter-scale micro gas' turbine is one of the most powerful issue for replacing chemical batteries. However, since limiting of MEMS manufacturing technique, it is very difficult that makes wide turbine bearing area. It causes low DN number, so sufficient bearing force is hard to achieve. Thus, the most important issue on micro gas turbine is proper bearing design which can keep rotor stable during operation. In order to that, micro-scale gas-lubricated bearing is generally used. In this paper, basic feasibility study and design of journal bearing for 10mm diameter micro gas turbine is described Journal bearing is hydrostatic gas-lubricated type. Numerical simulation is performed with ANSYS CFX 11.0 which is commercial numerical tool. Repulsive force when there is radial displacement in bearing and returning time is calculated using steady and unsteady cases. Auto re-meshing technic is used for moving mesh unsteady cases which simulate displacement of axis and its movement. The simulation results are used for further design of micro gas turbine, and experiment will be done later.