• Korean Journal of Poultry Science
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• v.46 no.2
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• pp.65-75
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• 2019

A number of Korean native chicken(KNC) populations were registered in FAO (Food and Agriculture Organization) DAD-IS (Domestic Animal Diversity Information Systems, http://www.fao.org/dad-is). But there is a lack of scientific basis to prove that they are unique population of Korea. For this reason, this study was conducted to prove KNC's uniqueness using 25 Microsatellite markers. A total of 548 chickens from 11 KNC populations (KNG, KNB, KNR, KNW, KNY, KNO, HIC, HYD, HBC, JJC, LTC) and 7 introduced populations (ARA: Araucana, RRC and RRD: Rhode Island Red C and D, LGF and LGK: White Leghorn F and K, COS and COH: Cornish brown and Cornish black) were used. Allele size per locus was decided using GeneMapper Software (v 5.0). A total of 195 alleles were observed and the range was 3 to 14 per locus. The MNA, $H_{\exp}$, $H_{obs}$, PIC value within population were the highest in KNY (4.60, 0.627, 0.648, 0.563 respectively) and the lowest in HYD (1.84, 0.297, 0.286, 0.236 respectively). The results of genetic uniformity analysis suggested 15 cluster (${\Delta}K=66.22$). Excluding JJC, the others were grouped in certain cluster with high genetic uniformity. JJC was not grouped in certain cluster but grouped in cluster 2 (44.3%), cluster 3 (17.7%) and cluster8 (19.1%). As a results of this study, we can secure a scientific basis about KNC's uniqueness and these results can be use to basic data for the genetic evaluation and management of KNC breeds.

• ETRI Journal
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• v.40 no.3
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• pp.347-354
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• 2018

Using various offset times to separate differential services is the most common form of service differentiation in optical burst switching networks. In this approach, a larger offset time is given to a higher priority burst, but it causes this burst to have a longer delay. One solution to this problem is to adjust the burst assembly time so that the buffering delay of the higher priority burst is always shorter than that of the lower priority burst. However, this adjustment causes another problem, called delay unfairness, for bursts with differential priorities that share the same path to their destination. This article proposes a new solution for delay fairness using the burst assembly.

• Journal of The Institute of Information and Telecommunication Facilities Engineering
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• v.6 no.3
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• pp.1-7
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• 2007

In this paper, we propose a new prioritized Optical Burst Switching (OBS) protocol based on a hop count, which can provide efficient utilization in optical networks. Under several legacy schemes, a switch drops the burst with the shortest time regardless of its traversed hop count. As a result, a dropped burst that have been traversed many hops might cause increased bandwidth waste compared to one that has traversed a few hops. To improve this problem, we propose the Just Enough Time (JET) with a hop counting scheme which can reduce the wasted bandwidth by prioritizing the burst traversed many hops over others. From the simulation result, it is preyed, we show that the proposed scheme has advantages against legacy schemes in terms of the burst blocking probability and the link utilization.

• Proceedings of the Optical Society of Korea Conference
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• 2002.07a
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• pp.104-105
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• 2002

Hyper-Rayleigh scattering(HRS)방법을 이용하여 쌍극자와 새로이 합성된 팔중극자들의 1차 초분극율 $\beta$를 측정하였다. External reference 법을 이용하였고, reference 물질로는 잘 알려져 있는 쌍극자인 PNA를 이용하여 Disperse Red 1과 팔중극자들의 1차 초분극율 $\beta$의 값을 구하였다. 또한 HRS 의 세기뿐만 아니라 이들 물질의 two-photon induced fluorescence 스펙트럼을 측정하였다. 1차 초분극율 $\beta$값은, 먼저 시료로부터 scattering 된 신호를 파장변화에 따른 스펙트럼으로 측정하여 two-photon induced fluorescence를 뺀 순수한 HRS 신호만을 이용하고, 실험에 사용된 물질들은 532nm에서 흡수가 있어 second harmonic generation 신호가 시료에 의해 흡수가 되므로 흡수효과를 식 $I_{2{\omega}}$(obs)= $I_{2{\omega}}$(true) $e^{-{\sigma}lN}$ ---(1)를 이용하여 흡수에 의한 신호의 감소 효과를 보정하여 값을 구했다. (중략)

• Proceedings of the Korean Information Science Society Conference
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• 2011.06b
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• pp.361-363
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• 2011

인공위성 탑재 컴퓨터는 위성 운영의 핵심 서브 시스템으로, 탑재 컴퓨터에 내장되는 OBS (On-Board Software) 의 복잡도가 증하고, 새로운 프로세서가 지속적으로 채택됨에 따라 재사용 가능한 소프트웨어의 필요성이 요구되고 있다. 본 논문에서는 소프트웨어의 재활용성을 제고하는 방법 중 하나로 Java VM과 유사한 가상머신인 SpaceApp VM을 제안하고 이를 구현하였다. SpaceApp 은 SpaceApp VM이 실행시키는 프로그램으로 Java의 WORA (Write Once Read Anywhere)의 개념을 위성 분야에 적용시킨 것이다. 본 연구에서는 SpaceApp VM의 설계와 개발에 대하여 설명한다.

• 한국신재생에너지학회:학술대회논문집
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• 2007.06a
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• pp.497-500
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• 2007

탄성파 코다 파는 두 수진기에서 기록된 탄성파 자료의 상호상관으로부터 두 신호에 대한 순간응답을 구하고 이로부터 지층정보를 구하는데 이용된다. 여기에서는 인공합성 탄성파 자료와 가스 하이드레이트 현장자료에 적용하여 상호상관 모음도와 가상음원 모음도 (virtual source)를 구하고자 하였다. 인공합성자료는 해저면 탄성파 탐사법 (ocean bottom seismic)을 모델로 이용하여 인공합성 탄성파 단면도를 제작하였으며, 탄성파 코다 파를 살펴보기 위해 인공 OBS 자료 중 첫 번째 트레이스를 가상음원으로 정하고 모든 음원 모음도와 상호상관으로 가상응원 단면도를 제작하였다. 현장자료 적용으로는 해저면 기인 고진폭 반사파인 BSR (bottom simulating reflection)을 포함하고 있는 자료를 선정하여 상호상관 단면도와 가상음원 단면도를 제작하였다. 중합단면도상에 나타난 가스 분출지역은 상호상관 단면도에서도 나타났으며, 중합단면도상 BSR부분은 vs 단면도에서 강한 반사파를 보여줌을 알 수 있었다.

• The tire
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• s.70
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• pp.12-16
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• 1977

전보에서 천연고무 가유물의 내산화성에는 가교형태의 비율과 결합촉진제나 환상설피드 등이 영향하고 있음을 명백히 했다. 본고에선 OBS/유황계에 대해서 열이력을 부여했을 경우 내산화성에 여하한 영향이 나타나는가를 보았다. 결국 가유시간, 열이력전후 및 망목밀도에 의한 내산화성의 영향을 검토했다. 그 결과 내산화성에 대해서 최적가유시간의 존재가 확인되었다. 이것은 열산화에 대해서 가교형태에 보다 안정된 비율이 존재한다고 추찰되었다. 또 질수중에서의 열이력의 영향에 대해서는 유황의 고비율에서는 내산화성은 양호하게 되며 OBS의 고비율에선 나빠졌다. 전자는 Sp량의 감소, 후자는 결합촉진제의 유리떄문에라고 생각된다. 망목밀도에 대해서는 산소흡수속도와 직선관계이었다.

• Korean Journal of Food Science and Technology
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• v.31 no.4
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• pp.1124-1127
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• 1999

In order to investigate the nutrients, such as amino acids and minerals concerned to propagate the cancer cells, cancerous tissues such as neuroblastoma with liver meta, cancer in situs. CIS, meta. squ. cell cancer, R/O squ. cell cancer, macro. RIF, metastatic papillary cancer. neck, stomach cancer, lung cancer, intestinal obs., 3 kinds of rectal cancers were analyzed. Tryptophane, a fat soluble amino acid, and minerals such phosphorus, sulfur and iron were contained exceptionally high in cancerous tissues than that of normal cells. And copper and zinc minerals were contained very low level in cancerous cells. Therefore, we can deduce that those constituents might be concerned to the formation of cancerous tissues.

• Proceedings of the KIEE Conference
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• 1998.07d
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• pp.1276-1278
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• 1998

In this paper, aging characteristics of silicone rubber used for outdoor insulation have been investigated with regards to sunlight effect. For this purpose, silicone rubbers were aged under the artificial sunlight by use of xenon arc lamp(1500W) and various tests were performed such as tracking, breakdown, contact angle, stress, strain. And then, in order to elucidate the changes of material, analysis have been followed as follows; FT-IR, SEM and EDS. Regarding the effect of the sunlight, it was obs that the surface of test samples are severely da with decreased hydrophobicity, tracking resistan breakdown strength.

• Journal of the Korean Ceramic Society
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• v.45 no.5
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• pp.251-255
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• 2008

Microwave dielectric properties of $MgTiO_3,\;MgWO_4,\;MgNb_2O_6$, and $MgTa_2O_6$ were investigated based on the structural characteristics. The dielectric constant (K) was dependent on the dielectric polarizabilities of the specimens, and the deviation of the observed dielectric polarizabilities (${\alpha}_{obs.}$) from the theoretical dielectric polarizabilities (${\alpha}_{theo.}$) were decreased with increasing of Mg-site bond valence. Quality factors (Qf) were affected by the sharing type of $MgO_6$ and $BO_6$ octahedra. Temperature coefficient of resonant frequency (TCF) was decreased with increasing of average octahedral distortion.