• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2003.07b
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• pp.669-672
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• 2003

With the advances on wireless internet technology, many research on minimization of wireless LAN is on the progress. To apply passive components in MCM, characteristic analysis of passive components is essential. In this paper, three square spiral inductors were modeled by HSPICE using PEEC (Partial Element Equivalent Circuit) method. Afterwards, Monte-Carlo analysis was performed to evaluate the optimized parameters. This work will give an idea on PEEC modeling of spiral inductor, and enable researchers with predictive data before large scale manufacturing.

• Journal of Ship and Ocean Technology
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• v.2 no.1
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• pp.42-57
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• 1998

Genetic Algorithm (GA) is applied to obtain optimal Inspection plan for fatigue deteriorating structures. The optimization problem is defined so as to minimize inspection cost in the 1ifs-time of the structure under the constraint that the increment of failure probability in each inspection interval is maintained below a target value. Optimization parameters are the inspection timing and the inspection quality. The inspection timing is selected from the discrete intervals such as one year, two years, three years, etc. The inspection quality is selected from the followings; no inspection, normal inspection, sampling inspection or precise inspection. The applicability of the proposed GA approach is demonstrated through the numerical calculations assuming a structure consisting of four member sets. Influences of the level of target failure probability, initial defect condition and stress increase due to plate thickness reduction caused by corrosion on inspection planning are discussed.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.57 no.12
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• pp.2228-2233
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• 2008

This research paper aims to establish a test process of the AFE SiP chip. It measured the sensitivity, current consumption and power consumption both on the evaluation socket board and Catalyst load board. As a result, the sensitivity became deteriorated with an average of 0.2[dBm] at the channel 62 only, the current consumption increased to an average of 0.57[mA] and the power consumption increased to an average of 1.76[mW], But all characteristics incomes the tolerance of the measurement, it also keeps almost the same level. Therefore this design of the test process improved a valid design.

• Structural Engineering and Mechanics
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• v.57 no.2
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• pp.369-387
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• 2016

In this work, random homogenization analysis for the effective thermal properties of a three-dimensional composite material with unidirectional fibers is presented by combining the equivalent inclusion method with Random Factor Method (RFM). The randomness of the micro-structural morphology and constituent material properties as well as the correlation among these random parameters are completely accounted for, and stochastic effective thermal properties as thermal expansion coefficients as well as their correlation are then sought. Results from the RFM and the Monte-Carlo Method (MCM) are compared. The impact of randomness and correlation of the micro-structural parameters on the random homogenized results is revealed by two methods simultaneously, and some important conclusions are obtained.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.14 no.9
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• pp.931-935
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• 2003

A multilayer two-stage LC bandpass filter using low-temperature cofired-ceramic(LTCC) is proposed in this paper. The proposed bandpass filter is composed of two ceramic substrates with different dielectric constant instead of single ceramic material from top to bottom layer. Inductive elements are designed in a low permitivity ceramic layer to reduce parasitic effects and loss, while capacitive elements are designed in a high permitivity ceramic layer for size reduction. The proposed filter has 950 MHz center &equency, 118 MHz tractional bandwidth, and 3.5 dB insertion loss. And, the total size of this filter is 2.5${\times}$2.5${\times}$l.4mm$^3$. The performance of filter is analyzed by changing coupling capacitance between each resonator.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.15 no.2
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• pp.172-177
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• 2004

In this paper, DGS(Defected Ground Structure) is applied to multi-layer structure using LTCC(Low Temperature Co-fired Ceramics). Sprial DGS is adopted in order for size-reduction and higher quality factor, the multi-layer DGS has the same characteristics as the planar DGS. Multi-layer bandpass filter of new shape is confiured using two multi-layer spiral DGS and is designed with no via-hole for the simple process. 5.25 GHz Wireless LAN bandpass filter is designed and fabricated, the insertion loss of the filter is measured less than 1.5 dB, and the size is 2.0 mm${\times}$1.2 mm${\times}$1.1 mm(L${\times}$W${\times}$H).

• Journal of Sericultural and Entomological Science
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• v.44 no.2
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• pp.74-81
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• 2002

The optimal conditions for mycelial growth of P. linteus ASI 26011 were 25-30$^{\circ}C$ and pH 6.0, respectively. The mycelial growth of P. linteus was excellent on MCM medium. In case of carbon sources, the mycelial growth of P. linteus was best on the culture media that were contained with sucrose, mannose and glucose. Potassium nitrate and sodium nitrate were good for the mycelial growth of P. linteus as a nitrogen source. For comparison of the mycelial colonization of P. linteus on logs, several techniques of inoculation were tested; the sterilized short log inoculation, drilling inoculation and log-end sandwich inoculation. The mycelial colonization of P. linteus on logs was good in the treatment of sterilized short log inoculation, but poor in the traditional methods such as drilling inoculation and log-end sandwich. The initial mycelial growth and the full mycelial colonization of P. linteus were the best on 20 cm logs under the condition of 42% of moisture content in log. Also the initial mycelial growth of P. linteus was accelerated over 12 hours of sterilization. Burying method of logs after 5-6 months of incubation was the best for formation of basidiocarp of P. linteus. The formation of fruiting body of P. linteus was quite good in the cultivation house at the 31-35$^{\circ}C$ and over 96% of relative humidity.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.24 no.8
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• pp.1077-1085
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• 2020

In order to Mine Countermeasure (MCM), the search is carried out for the expected mine zone. At this time, mine hunting uses Autonomous Unmanned Vehicle(AUV), taking into account the danger of mine and the stability of our forces. Sonar system for identifying buried mines are equipped with Side Scan Sonar(SSS) or Synthetic Aperture Sonar(SAS). This paper describes the analysis of mine hunting effects according to the commercial SSS characteristics. Based on the characteristics of each SSS, the insonified area and recognition probability were modeled, and the analysis was performed according to the search pattern of the AUV. AUV's search pattern defines three patterns depending on the presence or absence of SSS or shaded areas. The analysis results derived search time and detection probability for each search pattern, and finally, the improvement of search depending on the presence or absence of side injection or shaded area.

• Journal of Mushroom
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• v.2 no.3
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• pp.149-156
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• 2004

This study was carried out to obtain basic data on physiological characteristics for an artificial cultivation of fruiting body of Cordyceps. Specimens such as Cordyceps longissima, C. militaris and C. pruinosa were collected at Mt. Halla of Cheju island in July, 2003. Among four different culture media which have been used for culture of mushrooms, MCM medium was selected for the favorable culture medium of the Cordyceps tested. The initial pH of solid medium for mycelial growth of Cordyceps was good in the range of pH 5.0~7.0 lower than 8.0. The mycelial growth of C. longissima was most favorable on culture media supplemented with glucose, one of monosaccharides. In C. militaris, nine carbon sources were favorable to the mycelial growth as compared with control among 11 carbon sources. Six nitrogen sources were favorable to the mycelial growth of C. longissima as compared with control among 9 carbon sources; namely, the mycelial growth of C. longissima was most favorable on culture media contained potassium nitrate, and followed in order by ammonium citrate and sodium nitrate in 4 weeks incubation.

• Journal of Practical Agriculture & Fisheries Research
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• v.19 no.1
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• pp.83-90
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• 2017

In order to develop the culture material for breeding of Lentinula edodes, dikaryotic and monokaryotic mycelia were cultured in agar and sawdust medium. The cultivars were used Sanjo No. 701, Sanjo No. 705, Chamaram and Chuje No. 2 in this study. The mycelial growth of the cultivars were highest in PDA except for Sanjo No. 705, but Sanjo No. 705 showed the best mycelial growth in MCM. Regardless of the cultivars, the mycelial growth showed the most stable in MEA. There was no significant difference in mycelial growth among the cultivars in sawdust medium, but it was about 10% faster than that of Sanjo No. 701 and 705. Monokaryotic strains of Sanjo No. 701 and Chamaram showed less mycelial growth than dikaryotic mycelium. Dikaryotic mycelium of Chamaram showed better mycelial growth than that of Sanjo No. 701, but monokaryotic mycelium of Chamaram showed lower mycelial growth than Sanjo No. 701. The selected monokaryotic mycelium has a wide varience of mycelial growth, and the morphologies of the colonies are very diverse, so those are presumed that wide variences of monokaryotic are selected in genetically, and these monokaryotic mycelium are expected to be a good breeding materials.