• Journal of the Korean Geotechnical Society
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• v.28 no.8
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• pp.5-19
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• 2012

Vertical drains along with the preloading technique have been commonly used to enhance the consolidation rate of dredged placement formation. In practice, vertical drains are usually installed in the process of self-weight consolidation of a dredged soil deposit because this process takes considerable time to be completed, which makes conventional analytical or numerical models difficult to quantify the consolidation behavior. In this paper, we propose a governing partial differential equation and develop a numerical model for 2-D axisymmetric non-linear finite strain consolidation considering self-weight consolidation to predict the behavior of a vertical drain in the dredged placement foundation which is installed during the self-weight consolidation. In order to verify the developed model in this paper, results of the numerical analysis are compared with that of the lab-scaled self-weight consolidation test. In addition, the model verification has been carried out by comparing with the simplified method. The comparisons show that the developed model can properly simulate the consolidation of the dredged placement formation with the vertical drains installed during the self-weight consolidation. Finally, the effect of construction schedule of vertical drains and of pre-loading during the self-weight consolidation is examined by simulating an imaginary dredged material placement site with a thickness of 10 m and 20 m, respectively. This simulation infers the applicability of the proposed method in this research for designing a soil improvement in a soft dredged deposit when vertical drains and pre-loading are implemented before the self-weight consolidation ceases.

• Journal of Periodontal and Implant Science
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• v.39 no.2
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• pp.111-118
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• 2009

Purpose: The integrity of interproximal hard/soft tissue has been widely accepted as the key determinant for success or degree of root coverage following the connective tissue graft. However, we reason that the gingival biotype of an individual, defined as the distance from the interproximal papilla to gingiva margin, may be the key determinant that influence the extent of root coverage regardless of traditional classification of gingival recession. Hence, the present study was performed with an aim to verify that individual gingival scalloping pattern inherent from biotype influence the level of gingival margin following the connective tissue graft for root coverage. Methods: Test group consisted of 43 single-rooted teeth from 21 patients (5 male and 16 female patients, mean age: 36.6 years) with varying degrees of gingival recession requiring connective tissue graft; 20 teeth of Miller class I and 23 teeth of Miller class III gingival recession, respectively. The control group consisted of contralateral teeth which did not demonstrate apparent gingival recession, and thus not requiring root coverage. For a biotype determination, an imaginary line connecting two adjacent papillae of a test tooth was drawn. The distance from this line to gingival margin at mid-buccal point and this distance (P-M distance) was designated as "gingival biotype" for a given individual. The distance was measured at baseline and 3 to 6 months examinations postoperatively both in test and control groups. The differences in the distance between Miller class I and III were subject to statistical analysis by using Student.s t-test while those between the test and control groups within a given patient were by using paired t-test. Results: The P-M distance at 3 to 6 months postoperatively was not significantly different between Miller class I and Miller class III. It was not significantly different between the test and control group in a given patient, either, both in Miller class I and III. Conclusions: The amount of root coverage following the connective tissue graft was not dependent on Miller's classification, but rather was dependent on P-M distance, strongly implying that the gingival biotype of a given patient may play a critical impact on the level of gingival margin following connective tissue graft.

• Journal of the Korean Magnetics Society
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• v.25 no.4
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• pp.129-137
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• 2015

The Cu(radius ra = $95{\mu}m$)/$Ni_{80}Fe_{20}$(outer radius $r_b$ = $120{\mu}m$) core/shell composite wire is fabricated by electrodeposition. The two diagonal components of impedance tensor for the Cu/$Ni_{80}Fe_{20}$ core/shell composite wire in cylindrical coordinates, $Z_{zz}$ and $Z_{{\theta}{\theta}}$, are measured as a function of frequency in 10 kHz~10 MHz and external static magnetic field in 0 Oe~200 Oe. The equations expressing the diagonal $Z_{zz}$ and $Z_{{\theta}{\theta}}$ in terms of diagonal components of complex permeability tensor, ${\mu}^*_{zz}$ and ${\mu}^*_{{\theta}{\theta}}$, are derived from Maxwell's equations. The real and imaginary parts of ${\mu}^*_{zz}$(f) and ${\mu}^*_{{\theta}{\theta}}$(f) spectra are extracted from the measured $Z_{zz}$(f) and $Z_{{\theta}{\theta}}$(f) spectra, respectively. It is presened that the extraction of ${\mu}^*_{zz}$(f) and ${\mu}^*_{{\theta}{\theta}}$(f) spectra from the diagonal impedance spectra can be a versatile tool to investigate dymanic magnetization process in the core/shell composite wire.

• Journal of the Korean Institute of Intelligent Systems
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• v.24 no.1
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• pp.90-95
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• 2014

The researchs using brain-computer interface, the new interface system which connect human to macine, have been maded to implement the user-assistance devices for control of wheelchairs or input the characters. In recent researches, there are several trials to implement the speech recognitions system based on the brain wave and attempt to silent communication. In this paper, we studied how to extract features of vowel based on international phonetic alphabet (IPA), as a foundation step for implementing of speech recognition system based on electroencephalogram (EEG). We conducted the 2 step experiments with three healthy male subjects, and first step was speaking imagery with single vowel and second step was imagery with successive two vowels. We selected 32 channels, which include frontal lobe related to thinking and temporal lobe related to speech function, among acquired 64 channels. Eigen value of the signal was used for feature vector and support vector machine (SVM) was used for classification. As a result of first step, we should use over than 10th order of feature vector to analyze the EEG signal of speech and if we used 11th order feature vector, the highest average classification rate was 95.63 % in classification between /a/ and /o/, the lowest average classification rate was 86.85 % with /a/ and /u/. In the second step of the experiments, we studied the difference of speech imaginary signals between single and successive two vowels.

• Sijohaknonchong
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• v.20
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• pp.29-50
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• 2004

When we discuss the literature of traditional era in view of ecological mode, Saseol sijo and its common writers were not objects of interests because they were thought only as having the view of the world or nature the same as the noble class and their normal sijo writings had. Also the living things in Saseol sijo were not paid attention to. They were ignored and degraded because they were unfittable and unnatural poetic diction, or they were nonpoetic results of objects. Any critics could not recognize the breathing things as 'the living ones' or 'the subjective things' in the text. In Saseol sijo, the appearance of experienced, substantial and usual animals attract our interest, which is a clue to compare the noble class' sijo with having the ideal and imaginary living things. This study discussed the writer's view and recognition of 'the living things' in Saseol sijo. In this essay 'the living things' mean living and moving creatures. First 'the living things' in Saseol sijo were the creatures of daily life and experience. They were not ideal or dreamy creatures any longer to the writers of Saseol sijo. In Saseol sijo it's possible for creatures which ecological symbiosis cannot be made to appear together. On the contrary there are texts which had outstanding recognition of 'the living things' that were accustomed to the human life. The writers of Saseol sijo understood 'the living things' as creatures familiar to human beings. Their warm and affectionate eyes toward the creatures made 'the living things' the objects of identification and sympathy. There are some works which were complicated with love and hatred toward 'the living things'. In conclusion, the life of Saseol sijo writers were the same as the symbiosis with the living creatures.

• Journal of Sasang Constitutional Medicine
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• v.13 no.2
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• pp.1-7
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• 2001

Background and Purpose Through ${\ulcorner}$Dongyi Soose Bowon${\lrcorner}$, Dongmu Lee Je-ma supposed the minds of management for Sasang Constitutional Symptoms, which had been accomplished through several steps from his early writings to ${\ulcorner}$Dongyi Soose Bowon${\lrcorner}$ published in 1901. His basic minds of treatment for disease had been supposed early in ${\ulcorner}$Gyojapyungseongjam${\lrcorner}$ and ${\ulcorner}$Gyukchigo${\lrcorner}$, and had been completed to the Sasang Constitutional Symptoms and the minds of management for it, from ${\ulcorner}$Dongyi Soose Bowon Sasang Chobongyun${\lrcorner}$, ${\ulcorner}$Dongyi Soose Bowon${\lrcorner}$ written in 1894 to ${\ulcorner}$Dongyi Soose Bowon${\lrcorner}$ published in 1901. In this paper, I tried to find the minds of treatment of ${\ulcorner}$Dongyi Soose Bowon${\lrcorner}$, through classifying and researching the early minds of treatment (presented in ${\ulcorner}$Gyojapyungseongjam${\lrcorner}$, ${\ulcorner}$Gyukchigo${\ulcorner}$, ${\ulcorner}$Dongyi Soose Bowon Sasang Chobongyun${\lrcorner}$), and the latter minds of treatment (presented in ${\ulcorner}$Dongyi Soose Bowon${\ulcorner}$ written in 1894, ${\ulcorner}$Dongyi Soose Bowon${\lrcorner}$ published in 1901) Methods It was researched as bibliologically with his writings such as ${\ulcorner}$Gyojapyungseongjam${\lrcorner}$, ${\ulcorner}$Gyukchigo${\lrcorner}$, ${\ulcorner}$Dongyi Soose Bowon Sasang Chobongyun${\lrcorner}$, ${\ulcorner}$Dongyi Soose Bowon${\lrcorner}$ written in 1894, ${\ulcorner}$Dongyi Soose Bowon${\lrcorner}$ published in 1901. Results and Conclusions The conclusions were as follows. 1. At early, Dongmu Lee Je-ma pursued the minds of treatment at the autonomous control through 'Acquaintance and Self-control' based on 'the Knowledge of Nature and Desire', so emphasized 'self-control' as important point in treatment. 2. From ${\ulcorner}$Dongyi Soose Bowon Sasang Chobongyun${\lcorner}$, Dongmu summarized Sasang constitutional symptoms structurally in view of Morpho-imaginary. In ${\ulcorner}$Dongyi Soose Bowon Sasang Chobongyun${\lcorner}$ and ${\ulcorner}$Dongyi Soose Bowon${\lcorner}$ written in 1894, It was described in view of small organ, but in ${\ulcorner}$Dongyi Soose Bowon${\lcorner}$ published in 1901, suggested more updated in view of both large and small organ and to which added the concept of Hot and Cold. 3. Through reinterpreting the concept of interior and exterior disease in ${\ulcorner}$Sanghanrhon${\lcorner}$, the concept of Sasang constitutional symptoms had started as the minds of treatment for individual disease, but in ${\ulcorner}$Dongyi Soose Bowon${\lcorner}$ published in 1901, it was accomplished as the minds of broad management for Sasang Constitutional Symptoms. 4. In ${\ulcorner}$Dongyi Soose Bowon${\lcorner}$ published in 1901, the broad therapeutic prescriptions for management of Sasang constitutional symptoms were proposed newly, according to the accomplishment of Sasang constitutional symptomatic patterns, so these have different aims and are more important than that proposed previously. 5. The control in view of 'Knowledge and Deed' and the minds of management for Sasang constitutional symptoms are the minds and spirits for treantment and prevention against disease, which can maximize the power of autonomous self-treatment and manage all disease broadly.

• Journal of the Institute of Electronics and Information Engineers
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• v.51 no.11
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• pp.3-10
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• 2014

Direct conversion receiver(DCR) gets noticed for integration and cost reduction of wireless communication systems instead of the heterodyne receiver which uses complex filter. But DCR has several factors in performance degradation. One of them is I/Q imbalance phenomenon, that is amplitude and phase mismatch between real and imaginary part of receiver. Accordingly, researches are being carried to improve the I/Q imbalance problem. However, the tendency of the broaden bandwidth of communication systems, low pass filter(LPF) mismatch problem affects severely in I/Q mismatch phenomenon at the DCR. To study this problem, we generated 10MHz broadband signal and shifted it ${\pm}8MHz$ from the center frequency. The signal is affected by LPF mismatch and it appears as frequency selective distortion. Thus, LPF mismatch model is added to I/Q imbalance model which conventionally dealt with amplitude and phase mismatches. In addition, we proposed the compensation method for each factors of mismatch. As the simulation results, the proposed I/Q mismatch compensator resolves the frequency selective distortion which occurred by the existing LPF mismatch.

• Journal of Korean Society of Environmental Engineers
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• v.22 no.1
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• pp.91-101
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• 2000

The emission sources of volatile organic compounds (VOCs) are wastewater treatment plants. sanitary landfills, automobile industries, and so on. The VOCs are harmful to human beings because of their toxicity and carcinogenicity, and cause the serious air pollution problem producing ozone ($O_3$) as a result of photochemical reaction. To investigate the emission of VOCs from wastewater treatment plant, aeration basins at the City of Los Angeles' Hyperion Treatment Plant were selected and measured flux was compared with calculated flux. For compounds commonly associated with wastewater (DCM, TCM, PCE, UM, DCB, UND) and not expected in vehicle exhaust or ambient air coming off the ocean, concentrations immediately downwind of the aeration basins were a factor of ten or higher than those measured in the upwind air. The airborne flux of less degradable or non-biodegradable compounds, e.g., DCE, DCM, TCA, DCA, TCM, PCE, DCB, through an imaginary plane at the downwind side of the aeration basins was in agreement with the estimated flux from measured liquid phase concentrations. Henry's constant. aeration rate, and an assumption of bubble saturation. For several compounds (PCE, DCE, TCA), the ratio (measured flux/calculated flux) is almost unity.

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.9 no.2
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• pp.73-80
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• 2011

The radiation shielding analysis for a Burnup-credit (BUC) cask designed under the management of Korea Radioactive Waste Management Corporation (KRMC) was performed to examine the contribution of each radiation source affecting dose rate distribution around the cask. Various radiation sources, which contain neutron and gamma-ray sources placed in active fuel region and the activation source, and imaginary nuclear fuel were all considered in the MCNP calculation model to realistically simulate the actual situations. It was found that the maximum external and surface dose rates of the spent fuel cask were satisfied with the domestic standards both in normal and accident conditions. In normal condition, the radiation dose rate distribution around the cask was mainly influenced by activation source ($^{60}Co$ radioisotope); in another case, the neutron emitted in active fuel region contributed about 90% to external dose rate at 1m distance from side surface of the cask. Besides, the contribution level of activation source was dramatically increased to the dose rates in top and bottom regions of the cask. From this study, it was recognized that the detailed investigation on the radiation sources should be performed conservatively and accurately in the process of radiation shielding analysis for a BUC cask.

• International Journal of Highway Engineering
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• v.11 no.4
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• pp.59-68
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• 2009

Torsional behavior of concrete pavement slabs due to temperature and moisture effects is constrained by self weight and friction etc, and causes stress as the result. The stress due to humidity variation in the slab is difficult to calculate while that due to temperature variation can easily be calculated by a commercial structural analysis program. Thus, the slab behavior can be predicted more accurately if the humidity effect is converted to equivalent temperature and is used as an input of structural analysis. In this study, a concrete pavement slab was constructed and strains of the slab due to environmental loadings were measured for long-term period. Thermal strains were subtracted from the measured strains by using thermal expansion coefficient of the concrete measured in a laboratory. Shrinkage strains, the remained strains, was supposed as additional thermal strains to calculate imaginary temperature with equivalent effect of the shrinkage by dividing the shrinkage with the thermal expansion coefficient. An existing shrinkage model was modified by considering the self weight and friction to be used in another model which can convert differential shrinkage between top and bottom of the slab to equivalent temperature difference. Addition research efforts on tensile stress reduction according to steady increase in the compressive strains are warranted for more accurate stress calculation.