• Journal of the Korean Recycled Construction Resources Institute
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• v.3 no.1
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• pp.80-86
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• 2007

In this study we experimented setting time and basic properties as waste wood fiber and sodium silicate substitution rate to reuse waste wood fiber produced in construction field to wood chip board. To do this construction waste woods were crushed with the size less than 10mm, mixed with the rate of 1:2, 2.5, 3, and added sodium silicate with the rate of 0, 5% of cement content. The results are as follows. As the substitution rate of construction waste wood was increased delay of setting time was also increased, and the batch of adding 5% accelerator had a 13~17 hours faster setting time than non accelerator batch. The compressive strength was lower as wood substitution rate was higher, and as the specific gravity was higher, the strength was also higher. As wood substitution rate was higher, heat conductivity was lower, and as specific gravity was higher, heat conductivity also was higher.

• The Transactions of the Korean Institute of Electrical Engineers A
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• v.48 no.3
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• pp.313-320
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• 1999

The Lane-Curvature Method(LCM) presented in this paper is a new local obstacle avoidance method for indoor mobile robots. The method combines Curvature-Velocith Method(CVM) with a new directional method called the Lane Method. The Lane Method divides the environment into lanes taking the information on obstacles and desired heading of the robot into account ; then it chooses the best lane to follow to optimize travel along a desired heading. A local heading is then calculated for entering and following the best lane, and CVM uses this heading to determine the optimal translational and rotational velocity space methods, LCM yields safe collision-free motion as well as smooth motion taking the dynamics of the robot Xavier, show the efficiency of the proposed method.

• Journal of applied mathematics & informatics
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• v.40 no.5_6
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• pp.813-830
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• 2022

The generating functions of the divisor function σ_s(n) = Σ_0<d|n d^s are quasimodular forms. In this paper, we find the basis of the space of quasimodular forms of weight 6 on Γ₀(10) consisting of Eisenstein series and η-quotients. Then we evaluate the convolution sum Σ_ak+bl+cm=n σ(k)σ(l)σ(m) with lcm(a, b, c) = 10 and Σ_al+bm=n lσ(l)σ(m) and Σ_al+bm=n σ₃(l)σ(m) with lcm(a, b) = 10.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 1998.04a
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• pp.53-54
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• 1998

• Proceedings of the Korean Society of Embryo Transfer Conference
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• 2004.10a
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• pp.47-48
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• 2004

• Proceedings of the Korean Environmental Sciences Society Conference
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• 1998.04a
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• pp.72-74
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• 1998

• The Journal of Korean Physical Therapy
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• v.23 no.4
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• pp.59-66
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• 2011

Purpose: The objective of this study was to evaluate the inter- and intra-examiner reliability of ultrasonography (US) for measuring the thicknesses and cross-sectional area of the longus colli muscle (LCM) in healthy subjects. Methods: Twenty-five healthy adults participated in this study as subjects and two examiners attended to the study. LCM size was measured at the level of the thyroid cartilage. All subjects were randomly allocated to one of the three different methods. Method 1 was that the examiner A conducts the first measurement and one hour later conducts the second measurement and twenty four hours later conducts the third measurement, respectively. Method 2 was that the examiner B conducts the measurements in the same way as the examiner A. Method 3 was that the examiners A and B randomly conduct the measurements twice at an interval of one hour. Results: The intra-class correlation coefficient (ICC) for the intra-examiner reliability ranged from 0.78 to 0.98 at rest and 0.57 to 0.98 during contraction for the examiner A. The $ICC_{3,3}$ for the intra-examiner reliability ranged from 0.60 to 0.96 at rest and 0.57 to 0.92 during contraction for the examiner B. The $ICC_{2,3}$ for the inter-examiner reliability ranged from 0.80 to 0.91 at rest and 0.84 to 0.93 during contraction. Conclusion: The findings of this study indicate that US is a reliable method for measuring the LCM size.

• Journal of the Korean earth science society
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• v.24 no.4
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• pp.325-336
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• 2003

The onset time of sea breeze at Haeundae is faster than that at Suyoung in spite of the observation site at Suyoung being 5m and that of Haeundae being 1 km away from the coastline. We therefore simulate the effects of terrain on the onset time of sea breeze at Suyoung and Haeundae districts by using the LCM(Local Circulation Model). This phenomenon is due to the nighttime density flow, which is created by nighttime radiative cooling. It follows the slope of the highlands surrounding the urban area, gathers at a central area of Busan, and then flows out to a lower area like Suyoung river. This process continues after sunrise. In researching the AWS wind speed, we find an important thing. That is to say, the nighttime mean wind speed at Suyoung is three times greater than that at Haeundae. This property shows that Suyoung is an outflow channel of nighttime air mass. The above observed data shows that terrain effect has a important role on the onset of sea breeze.

• Proceedings of the Korean Vacuum Society Conference
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• 2013.08a
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• pp.229.1-229.1
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• 2013

초격자는 동종의 III-V 삼원 합금층을 성장하는 동안 스피노달 분해(spinodal decomposition)로 인한 원자배열(atomic ordering)과 상분리phase separation)에 의해서 발생하는데 MBE (molecular beam epitaxy)과 MOVPE (metalorganic vapor phase epitaxy)를 이용하여 성장시킬 때 주로 발생한다. 본 논문에서는 성장온도에 따른 InP/GaP SPS (short-period superlattices) 구조의 광학적 특성 변화를 시료의 온도와 여기광의 세기를 이용하여 분석하였다. 시료는 MBE 장비를 이용하여 성장하였으며, SPS층은 659쌍의 GaP(2.9 ${\AA}$)과 InP(3.1 ${\AA}$)로 이루어져 있고, GaP 층을 처음에 증착한 뒤, InP 층을 증착 하였다. 성장시 온도를 $400^{\circ}C$, $425^{\circ}C$, $460^{\circ}C$ 그리고 $490^{\circ}C$로 변화를 주어 성장하였다. 이들 시료를 GT400, GT425, GT460 그리고 GT490이라 하였고 이에 대한 광학적 특성을 PL (photoluminescence)를 이용하여 분석하였다. 10 K에서 PL 피크는 GT400 시료는 634 nm, GT425 시료는 636 nm, GT460 시료는 680nm, 그리고 GT490 시료는 692 nm에서 나타났으며, GT425 시료의 PL 세기가 가장 강하게 나타나고 GT400 시료의 PL 세기가 가장 약하게 나타났다. 그러나 260 K에서 PL 세기는 GT460 시료가 가장 강하게 나타나고 GT425 시료가 가장 약하게 나타났다. 성장온도가 증가함에 따라 밴드갭이 감소하는 것은 특정 성장온도($460^{\circ}C$) 이상에서 LCM (lateral composition modulation)이 형성되는 것으로 설명할 수 있다. GT400 시료와 GT425 시료의 PL 피크가 1.94 eV와 1.95 eV로 비슷하고, GT460 시료와 GT490 시료의 PL 피크가 1.82 eV과 1.79 eV로 비슷하게 나타난 것은 $460^{\circ}C$이상에서 성장한 시료에서 LCM 구조 형성으로 설명할 수 있다.

• Development and Reproduction
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• v.14 no.2
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• pp.99-105
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• 2010

The seminiferous epithelium, with its division into 12 spermatogenic stages in the mouse, is a very complex tissue. Glutathione peroxidase (GPx) is a representative antioxidant enzyme that is capable of reducing organic hydroperoxides to their corresponding hydroxyl compounds utilizing glutathione and is related to the mammalian spermatogenesis. In this study, a real-time PCR was performed in the stage-specific seminiferous tubules of mouse testes excised by a laser capture microdissection (LCM) in order to quantitate the expression levels of a series of GPx genes including cytosolic GPx (cGPx), gastrointestinal GPx (GI-GPx), plasma GPx (pGPx), and phospholipid hydroperoxide GPx (PHGPx). Frozen sections (10 ${\mu}m$) were obtained from normal adult mouse testes. LCM was used to capture all the cells that were grouped into stages I-V, VII-VIII, and IX-XI in cross-sections of seminiferous tubules. The expression level of PHGPx mRNA was remarkably higher than those of other GPx mRNAs in mouse testes. During spermatogenesis, the expressions of GI-GPx, pGPx, and PHGPx mRNAs were highest on stages VII-VIII, began to decrease after stage XI, and showed a lowest level on stage I-V. However, the expressions of cGPx mRNA were highest on stages VII-VIII, and showed a lowest level on stage XI-XI. These findings indicate that GPx genes are expressed differentially on mouse spermatogenesis and also LCM can be an useful tool in cellular quantitative analysis of testes.