• Journal of the Korean Crystal Growth and Crystal Technology
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• v.23 no.3
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• pp.152-160
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• 2013

The purpose of this study is to enhance the mechanical strength of specimens containing fly ash from fluidized bed type boiler, which the recycling rate will be eventually increased. Specimens containing fly ash in a certain portion were made and aged for 3, 14, and 28 days. Specimens were carbonated under the supercritical condition at $40^{\circ}C$. The carbonation process under the supercritical condition was performed to enhance the mechanical property of specimens by filling the voids and cracks existing inside cement specimen with $CaCO_3$ reactants. The additional aging effect after the supercritical carbonation process on mechanical strength of specimens was also investigated by comparing the compressive strength with and without 7 day extra aging. Under the supercritical condition and additional 7 day aging specimens were very effective for enhancement of mechanical strength and compressive strength increased by 44 %.

• Physical Therapy Korea
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• v.8 no.4
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• pp.81-89
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• 2001

There are two independent mechanisms to control the segmental reflex gain in humans during gait. They are presynaptic inhibition and homosynaptic depression. Through the mechanism of the presynaptic inhibition, the muscle spindle afferent feedback can be properly gated during eccentric phase of gait. The modulation of the presynaptic inhibition is reflected in the level of H-reflex at a constant EMG level. During the eccentric muscle activation presynaptic inhibition should increase to account for the lower amplitude level of H-reflex at a constant level of EMG. Homosynaptic depression is another mechanism responsible for regulating the effectiveness of the muscle spindle afferent feedback. Both the presynaptic inhibition and the monosynaptic depression are responsible for modulating reflex gain during gait initiation. Reflex modulation is influenced not only as a passive consequence of the alpha motor neuron excitation level, but also through supraspinal mechanisms. Spastic paretic patients show the impaired soleus H-reflex modulation either during the initial stance phase, or during the swing phase. This abnormal modulatory mechanism can partially and artificially be restored by the application of peripheral stimulus to the sole of the foot, provided that the segmental circuitry remains functional.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.30 no.5B
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• pp.247-252
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• 2005

The testing tools implemented up to now for the LDAP(Light-weight Directory Access Protocol) interoperability tests are not easy to modify or add new test items since their source codes are not open. The object-oriented approach, therefore, is required to implement such a testing tool which can be easily modified or add new test items. Thus we designed the architecture for the testing tool applying the object-oriented approach. Java language, appropriate for the object-oriented approach, was used to implement the testing tool. The newly implemented testing tool can modify partly to adapt to the already stored data in the test suite information even during tests. Five LDAP servers can be tested simultaneously with the same configuration setup. Actual testing for the two LDAP servers validates the usefulness of the designed architecture with the proper working of the implemented testing tool according to the architecture.

• Proceedings of the Korean Society of Marine Engineers Conference
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• 2011.06a
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• pp.76-76
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• 2011

선박이나 산업 플랜트에서 파이프 또는 탱크류의 맞대기 용접 시 안정적인 이면비드의 형성은 매우 중요하다. 대부분의 현장에서 파이프 맞대기 초층용접부의 안정적인 이면비드를 형성하기 위해 3mm의 루트갭을 띄우고 루트면이 없는 V-그루브에서 필러를 사용하는 수동 TIG용접을 주로 사용하고 있다. 수동 TIG용접은 고품질의 비드와 우수한 아크안정성, 그리고 용접인자의 제어가 쉽다는 장점이 있다. 그러나 수동 TIG용접은 용접속도가 10cpm정도로 느리기 때문에 GMAW에 비해 생산성이 낮고 작업자의 숙련도에 따라 품질이 변하게 된다. 본 연구에서는 높은 생산성과 기준갭 1.5mm에서 단차의 허용공차를 크게 하기 위해 루트면 3mm를 가지는 U-그루브의 설계를 하였으며, 두꺼운 루트면을 가지는 그루브에서 안정적인 이면비드를 형성시키기 위해 GMAW에서 아크 충격량에 대한 검토를 실시하였다. GMAW의 아크력이 용입에 어떠한 영향을 미치는지 검토하기 위해 수냉되는 동판에 갭을 1.5mm 띄우고 동일한 용착량과 입열량에서 아크력만을 변화시켜 실험하였다. 또한, U-그루브의 루트부를 모델링하여 두께3t의 평판시편을 각각의 갭과 단차 조건에서 실험하였다. 이 때, 기준갭 1.5mm에서 갭에 의해 생기는 단면적을 기준 갭단면적, 갭이 증가함에 따라 증가되는 단면적을 추가 갭단면적, 갭이 감소함에 따라 감소하는 단면적을 감소 갭단면적으로 정의하였다. 용접 중 발생하는 추가, 감소 갭단면적에 대하여 용착량을 50%의 수준으로 증가, 감소 시켰다. 갭에 따라 아크력을 변경하여 실험을 실시하였고 이면비드의 형상을 확인 하였다. 마지막으로 평판 시편의 조건에서 안정적으로 이면비드가 형성된 조건을 pipe U-그루브에 적용하였다. 그 결과 동판에서 용착량과 입열량이 같음에도 불구하고 아크력이 증가함에 따라 용입이 깊어짐을 확인하였다. 또한. 3t 평판시편에서 아크력의 제어를 통해 큰 단차와 갭이 있을 때, 안정적인 이면비드를 얻을 수 있는 조건을 확립하였다. 마지막으로 pipe U-그루브에서 앞선 실험의 용접조건으로 갭과 단차의 변화에 대해 실험을 하였으나, 시험편의 두께차이에 의한 전도 열손실로 인해 이면비드의 형성이 어려웠고, 아크 충격량의 증가를 통해 이러한 문제를 해결하였다.

• Food Science of Animal Resources
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• v.21 no.4
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• pp.344-348
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• 2001

This study was carried out to examine the effect of vitamin E additive supplements on the meat quality of finishing pigs. Two treatments were provided as commercial diet and commercial diet +vitamin E 200 IU. Dressing percent and carcass length were not different between treatments. Longissimus muscle color and longissimus muscle firmness were a significant differences between two treatments(P<0.05). However, longissimus muscle marbling. longissimus muscle loin area and back fat thickness were not significantly differences. Water holding capacity was increased along the level supplement of vitamin E increased(P<0.05). However. there were not differences on shear force, thawing loss, and cooking loss between treatments. L*, a*, b* and TBARS value were not different between treatments. In conclusion. longissimus muscle color and water holding capacity were affected by vitamin E supplement.

• Korean Journal of Ichthyology
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• v.18 no.2
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• pp.141-147
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• 2006

The matured female and male of A. signifer differed in external morphology and body color. There were significant differences in PAD, PAB, PMP and PQR between matured female and male. Green color was very widely distributed in whole as nuptial color, that is similar to green and cyan color in the body part, yellow color in the ventral part and red and yellow color in the tail part. The nuptial organ of A. signifer was formed in a cluster on the horny substance of both sides above the mouth. There were 25~30 nuptial organs in a side. The nuptial organs disappeared with crumbling down from middle part of nuptial organ after spawning period. The nuptial organs disappeared mostly in September as non spawning period and a part of the nuptial organs remained as a vestige in the edges of both sides.

• Journal of the Korea Society of Computer and Information
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• v.19 no.12
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• pp.91-100
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• 2014

In this paper, we categorize existing human gesture recognition technologies to camera-based, additional hardware-based and frequency-based technologies. Then we describe several representative techniques for each of them, emphasizing their strengths and weaknesses. We define important performance issues for human gesture recognition technologies and analyze recent technologies according to the performance issues. Our analyses show that camera-based technologies are easy to use and have high accuracy, but they have limitations on recognition ranges and need additional costs for their devices. Additional hardware-based technologies are not limited by recognition ranges and not affected by light or noise, but they have the disadvantage that human must wear or carry additional devices and need additional costs for their devices. Finally, frequency-based technologies are not limited by recognition ranges, and they do not need additional devices. However, they have not commercialized yet, and their accuracies can be deteriorated by other frequencies and signals.

• Journal of Veterinary Clinics
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• v.29 no.4
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• pp.315-318
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• 2012

This report describes a case of foot and mouth disease (FMD) in farm-raised Sika deer. FMD serotype A occurred in six cattle farms in January 2010 since the outbreak of pig cases 2002 in South Korea. In addition to the six cattle farms where the disease occurred during January, positive reactions to FMD antibodies were found in two heads of deer on March at a deer farm in serological tests intended to lift the movement restriction of the susceptible animals imposed within risk zone. In the specimens collected from 12 heads for confirmatory tests in the same farm, no virus was detected in antigen tests and neutralising antibody titers in all raising deer in the farm were relatively high. So it seems likely that the animals had been infected with FMD at least one month earlier when they were found.

• The Journal of the Korea Contents Association
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• v.16 no.1
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• pp.75-81
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• 2016

The recent radiation therapy field can provide treatment which guarantees a high degree of accuracy, due to patient set-up using various image guided radiation therapy(IGRT) instruments. But the additional absorbed dose to patient's normal tissues is increasing. Therefore, this study measured the absorbed dose to surrounding normal tissues which is caused by patient set-up using OBI, CBCT, ExacTrac, among various IGRT instruments. The absorbed dose to the head, the chest, the abdomen, and the pelvis from CBCT was 12.57 mGy, 20.82 mGy, 82.93 mGy, and 52.70 mGy, respectively. Also, the absorbed dose from OBI and ExacTrac ranged from 0.76 to 8.58 mGy and from 0.14 to 0.63 mGy, respectively. As a result, CBCT's absorbed dose was far higher than other instruments. CBCT's surface dose was far higher than others, too, but OBI's entrance skin dose was almost the same as CBCT's.

• Journal of Korea Multimedia Society
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• v.7 no.7
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• pp.905-912
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• 2004

It is a study LVMPD to solve the fairness problem of inter-session shared bandwidth. Whenever congestion occurs in one session, the highest layer is dropped. Also the highest layer of other sessions in non-congestion is dropped by iner-session fairness. While there is spare bandwidth, receivers of session in non-congestion can't use bandwidth efficiently. In this paper, we proposed a distribution method to use efficiently spare bandwidth that occurred by inter-session fairness. In our method, we considered the highest layer those receivers receiving and the higher layer those receivers requesting. The sender assigns the packet-deleting priority to packets when congestion occurs in receivers, and sets layer add/drop flag when receivers of session in non-congestion request the higher layer. The switch deletes packets with packet-deleting priority and transfers packets with layer add/drop flag for session in non-congestion. Therefore receivers of session in non-congestion can add the higher layer. In experimental results, it was known that proposed algorithm use the inter-session shared bandwidth more effectively compared with already known method.