• Journal of Korean Society of Environmental Engineers
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• v.28 no.4
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• pp.397-401
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• 2006

A laboratory study was conducted to evaluate the kinetics of oxidation of trichloroethylene(TCE) in groundwater by potassium permanganate($KMnO_4$). Consumption of permanganate by TCE and aquifer material was also evaluated to obtain an appropriate injection rate of $KMnO_4$. TCE degradation by $KMnO_4$ in the absence of aquifer material was effective with a pseudo-first order rate constant, $k_{obs}=5.24{\times}10^{-3}s^{-1}\;at\;KMnO_4=500mg/L$. TCE oxidation by $KMnO_4$ was found to be second order reaction and the rate constant, $k=0.65{\pm}0.08M^{-1}s^{-1}$. Meanwhile, aquifer materials from the field site were actively reacted with permanganate, resulting in the significant consumption of $KMnO_4$. It might be attributed to the existence of metal oxides in the aquifer materials.

• Archives of design research
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• v.20
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• pp.99-109
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• 1997

The Bauhaus movement can be said to be the by-product of forming work pursued through the method of constituents even under endless discord between the so-called modern ages and anti-modern ages rather than to say that it was progressed consistently on the assumption of a design. Accordingly, all instruments of Bauhaus education which contributed to form the source of the modern ages realized educational value related to the actual problem at the point of time when the student evercomes all internal and production can be managed most effectively under one system was originated inevitably. The most exential point of the work of Bauhaus workshop is the fact that all products show homogeneity as time passes, which is appeared as the result of the spirit of consciously developed community based on cooperation between various characters and personalities. Also, the homogeneity does not exist in formative detailed aspect appeared externally but in the basis of effort having produced things simply and faithfully, and on the other hand, in accordance with essential rule. Therefore, the original form of Bauhaus products can be said not to be fashionable but the crystal of work process at the workshop through much thought and contemplation in view of endowed form following art, technology and economy.

• Journal of Astronomy and Space Sciences
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• v.17 no.1
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• pp.19-32
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• 2000

A total of 1,018 observations (509 in B, 509 in V) of the eclipsing binary VW Cep was made during 7 nights from April through May in 1999 at Sobaeksan Optical Astronomy Observatory, using the CCD camera attached to the 61cm telescope. A time of minimum light of HJD2451327.2282 was determined from our data, and we constructed BV light curves with the data. Using, Wilson-Devinney’s binary model, we analized the light curves. The absolute dimension of $M_1=0.95M_\odot,M_2=0.33M_\odot,R_1=1.02R_\odot,R_2=0.66R_\odot$ of the VW Cep system were derived from our light curve solution and Kaszas et al. (1998) spectroscopic results.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.3
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• pp.356-363
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• 2017

Blast furnace slag(BFS) is a by-product generated during the manufacture of pig ion, and is divided into water-cooled slag(WS) and air-cooled slag(AS) by the coking method of BFS. In this study, concrete specimens with ternary binders were produced at the various replacement levels of cement by AS. Various mechanical properties of concrete, such as compressive and split tensile strengths, absorption and water permeable pore, were measured. In addition, the chloride ions penetration resistance and carbonation resistance were tested to evaluate the durability of concrete incorporating AS. The experimental data indicated that the use of AS up to a maximum of 10% replacement level enhanced the concrete performance. However, a higher replacement of AS exhibited poor mechanical properties and concrete durability.

• Korean Journal of Microbiology
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• v.39 no.2
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• pp.118-122
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• 2003

To develop vector plasmid for the bacteriophage P2-P4 system which is a useful experimental tool for the study of viral capsid assembly, we constructed a new P4-derived vector plasmid starting from P4 ash8 sid71 With recombinant DNA technology, a portion of P4 genome was deleted and tetracyclin resistance gene (terR) was introduced into P4 genome to give P4 selectivity. Resulting P4 ash8(sid71) terR was 12.09 kb long and could be converted to a viable bacteriophage with P2 infection. The burst size of induced bacteriophage form of P4 ash8(sid71) terR was determined. The CsCl buoyant equilibrium density gradient experiment of new P4 derivative suggested the upper limit of packaging capacity in P2-size head.

• Proceedings of the Korea Concrete Institute Conference
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• 2008.11a
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• pp.541-544
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• 2008

Recently, due to the increase of high-rise buildings construction, many researches for making harden of concrete earlier and remove of forms faster are being performed to reduce construction period. The purpose of this study is to analysis which mixing condition and curing temperature of early strength concrete. Porperties of concrete by the different factors, such as the type of active admixtures, mineral admixtures, curing temperature, the amount of binder, etc. Through the test of concrete using the different type of admixture, PC type was more excellent than PNS type admixture. The concrete Strength remarkably will be able to confirm that decreases from temperature below 12$^{\circ}C$.

• The Journal of Information Technology
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• v.4 no.3
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• pp.49-64
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• 2001

The purpose of this study was to observe whether the status of a firm's website affects the performance of the other affiliated websites. In other words, whether or not the website could improve its performance from developing high-status affiliation was investigated. The status of a website being affiliated was measured based on the number of citations, and the performance of a website developing affiliation on the number of visitors. The affiliation between websites was defined as banner links. For the analysis, the status of the initiator's website, that might be expected to affect the website performance, was controlled. To achieve the purpose of this study, a field study method was adopted. To obtain the data, an unprecedented method employing a program that gathers all related information concerning a specific website was used. The findings of this study indicated that the website developing high-status affiliation did not significantly improve its performance. Such findings different from previous research may have resulted from different characteristic of affiliation and limited samples available.

• Journal of IKEEE
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• v.23 no.4
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• pp.1187-1194
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• 2019

This paper proposes a CNN architecture as value function network of an artificial intelligence Othello game agent and its learning scheme using reinforcement learning algorithm. We propose an approach to construct the value function network by using CNN to learn the records of professional players' real game and an approach to enhance the network parameter by learning from self-play using reinforcement learning algorithm. The performance of value function network CNN was compared with existing ANN by letting two agents using each network to play games each other. As a result, the winning rate of the CNN agent was 69.7% and 72.1% as black and white, respectively. In addition, as a result of applying the reinforcement learning, the performance of the agent was improved by showing 100% and 78% winning rate, respectively, compared with the network-based agent without the reinforcement learning.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.36 no.7
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• pp.777-787
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• 2012

The transient analysis for the output voltage of a piezoresistive microaccelerometer takes a relatively high computation time because at least two iterations are required to calculate the piezoresistive-structural coupled response at each time step. In this study, the high computational cost for calculating the transient output voltage is considerably reduced by an approach integrating the mode superposition method and the least square method. In the approach, data on static displacement and output voltage calculated by piezoresistive-structural coupled simulation for three acceleration inputs are used to develop a quadratic regression model, relating the output voltage to the displacement at a certain observation point. The transient output voltage is then approximated by a regression model using the displacement response cheaply calculated by the mode superposition method. A high-impact microaccelerometer subject to several types of acceleration inputs such as 100,000 G shock, sine, step, and square pulses are adopted as a numerical example to represent the efficiency and accuracy of the suggested approach.

• Management & Information Systems Review
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• v.33 no.3
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• pp.155-166
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• 2014

This study is on visions having influence on school life to analyze differences between students who have clear visions and those who do not during school life. In order to achieve the goal of this study, the influence which visions have on school life has been analyzed by measuring attitudes towards school life (satisfaction, a sense of belonging, passion, and frustration) depending on students who have visions or those who do not. This analysis shows that the more visions students have, the more satisfaction, a sense of belonging, and passion they have and the less frustration they have. Thus, visions have positive influence on school life and it is essential to reinforce education for students to have clear visions by opening camps to find visions and teaching how to find visions.