• The Korean Journal of Zoology
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• v.37 no.2
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• pp.222-231
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• 1994

밤바구미 유충기의 whole body로부터 cyclic AMP(CAMP)를 추출하여 농도 변화를 측정하였고 cyclic AMP-dependent protein kinase(PKA)를 부분 정제하여 활성도 변화를 조사하여 CAMP 농도와 PKA 활성도와의 소장관계를 비교하였다 CAMP 농도와 PKA 활성도는 HPLC와 liquid scintillation counter를 이용하여 측정하였다 CAMP 농도는 밤바구미 유충에서 월동전에 0.57 UMlg로 가장 높았고, 월동중에 0. 14 UMIS로 감소하였다가 월동후에 0.29 UMlg로 증가하였다 또한 PKA 활성도는 월동전에 2.56unit/mg로 가장 높았으며, 월동중에 0.62 unit/mg로 감소하다가 월동후에 07 unit/mg로 다시 증가하여 CAMP 농도 변화와 유사한 경향을 나타내었다. 이는 월동전에 휴면에 대비하여 최대의 취식으로 지방체 축적이 가장 많았고, 월동중에는 지방체의 소비가 증대되.기 때문에 감소하였다가, 월동후 휴면 종결과 유충-번데기 탈피를 준비하기 위해 'CAMP 농도와 PKA 활성도는 다시 증가하였다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2004.05b
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• pp.674-677
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• 2004

최근 대부분의 전송기술(LAN 뿐만 아니라 MAN과 WAN까지)이 이더넷으로 통일되는 경향에 힘입어, 예전에 비하여 이더넷은 최근에 대단한 주목을 받게 되었다. 그러나 그동안 ATM 등의 전송기술에 의해 관심밖에 있던 이더넷이기 때문에, 국내에서 축적된 기술도 미약하다. 그리고, 이더넷이라는 기술은 단순한 디지털 로직이 아닌 디지털 / 아날로그 모뎀기술과 광 전송기술, 소프트웨어기술들이 결합된 고도의 전송기술이기 때문이다. 10Gbps 이더넷 표준이 2002년에 발표되면서 10Gbps 이더넷에 대해 많은 연구가 지속되고 있다. 10Gbps 이더넷의 특징은 이더넷 고유의 CSMA/CD 방식을 지원하지 않고, 점대점 전이중 방식만을 지원하고, 기존의 프레임구조는 계속 유지하였다. 본 연구에서는 10Gbps 이더넷 Data Link 계층의 MAC(Media Access Control) 코어를 C언어를 이용하여 성능평가를 실시하여 활용 가능한 응용분야와 내부 FIFO와 파라미터 초기 값을 도출하였다. 성능평가 결과 MAC 모듈은 짧은 패킷이 유입되었을 때 95%까지, 일반 패킷이 유입되었을 때 97%까지 패킷 손실이 발생하지 않음을 확인하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2010.04a
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• pp.1041-1042
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• 2010

본 연구 과제에서 살펴보고자 하는 내용은 기업을 운영하는 구성원의 능력을 평가하는 방법을 통해 업무능력과 평가결과와의 연관성을 분석하여 살펴보고자 한다. 본 연구에서는 특정기업이 활용하는 직원평가 프로그램에 대해 분석하고 그 프로그램에 의해 수개월동안 축적된 자료를 분석하여 업무평가결과와 기업 구성원의 성향 및 매출 기여도를 분석 하였다. 본 연구에서 채택한 방법은 군집 분석 방법 중의 하나 인 다층전방향 신경망 분석을 이용하였다. 본 연구결과는 평가에서 우수한 점수를 받은 기업 구성원은 기업 전반을 운영하는 운영진에 위치해 있는 경향을 보이고 매출과의 연관성에서 다른 직원 대비 우수하게 나왔다. 본 연구는 특정집단을 대상으로 한 것으로서 한계성을 가지며 여러 집단을 같은 프로그램으로 운영시 나오는 결과를 살펴보는 것을 향후 과제로 남겨 놓았다.

• Proceedings of the Korea Water Resources Association Conference
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• 2022.05a
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• pp.297-297
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• 2022

홍수 발생으로 인해 야기되는 피해가 매년 일어나고 있으며, 현재 수재와 관련된 방대한 데이터가 축적되어 있어 이를 활용한 연구들이 진행되고 있다. 데이터를 기반으로 홍수 전후의 시공간적인 변화에 대한 다양한 분석이 가능하여 수재 대응에 유용하게 활용될 수 있다. 본 연구에서는 원격 탐지 및 재분석 데이터를 활용하여 파머 가뭄 지수(PDSI), 강우량, 유출량, 실제 증발산량(AET), 대기 온도 등의 수재와 관련된 요인들에 대한 지수분석을 통해 공간 변화를 파악하고 경향을 분석하였다. 이를 통해 자연 현상을 다루는 환경 영역에서의 데이터 기반 연구의 가능성이 확대될 수 있으며, 향후 연구에 활용하고자 한다.

• Journal of The Korean Society of Grassland and Forage Science
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• v.26 no.3
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• pp.147-154
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• 2006

This study was conducted to investigate the effects of Total Mixed Ration(TMR) with wet brewer's grain on feed intake, nutrient digestibility and nitrogen retention of breeding Korean native goat. Twelve breeding Korean native goats were divided into four treatment groups, which were fed TMR containing 20, 30, 40% of wet brewer's grain and a control group fed concentrate feed and hay, respectively. Results are summarized as follows. Dry matter contents of TMR with wet brewer's grain was 61.46-65.81%, that of crude protein was 14.42-15.59%, ADF and NDF were 28.32-28.52, 53.46-54.16%, each. These were not different by supplemental level of brewer's grain in TMR. However, NFC contents were lower according to increase wet brewer's grain in TMR. Dry matter intake of TMR supplemented with 20% of brewer's grain was tend to be higher than those of control group. CP and digestible CP intake of TMR diets supplemented wet brewer's grain was intended to higher than those of a control group. NFC and digestible NFC intake were significantly higher in control group than in WBG40 treatment(p<0.05). Digestibilities of DM, ADF, NDF and NFC in control group were higher than those from TMR with wet brewer's grain(p<0.05). Digestibilities of CP of TMR with supplemented wet brewer's grain was tend to be higher than those of a control group. Nitrogen retention of TMR supplemented wet brewer's grain was tend to be somewhat higher compared to the control group

• Korean Journal of Poultry Science
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• v.6 no.2
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• pp.83-90
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• 1979

In order to evaluate the effect of lipids on the utilization of the energy and Protein of the diet, the isocaloric and isoprotein diets added with mutton fat, tallow, and lecithin at the levels of two percent and five percent were prepared. The growth of chicken and the feed efficiency were observed on hatched chicken which were fed a commercial diet for the first week, with starters for the next four weeks, and with finisher diets for the last three weeks respectively during the eight weeks of the experiment. Growth rate, feed efficiency, and average body weight gain per day were similar among the chicken fed diets containing various lipids or at the levels of two percent and five percent. The metabolizable energy of the diets was found to be from 2.713kcal to 3.059kcal per gram, and the metabolizability of the gross energy was from 62 percent to 70 percent. Also the metabolizability of basal diet was higher as compared with the diets containing lipids. And the lower energy utilization was found in the broilers fed diets containing five percent lipids than those of two percent, showing not significant difference between them. Daily metabolizable energy of three week old birds ranged from 132kca1 to 168kcal which resulted in also a tendency of lower values in the five percent diets. And daily retained nitrogen of birds ranged from 0.631 gr to 0.738 gr, which showed an increasing tendency on the birds fed five percent mutton fat and tallow in comparison with those of two percent. But the lecithin brought about a reverse tendency. The digestibility of crude fats was found to be from 48 percent to 76 percent, but not significant difference among diets plus lipids or at the levels of two percent and five percent. The birds fed five percent mutton fat and tallow showed a tendency of lower digestibility as. compared with those fed two percent, but the similar results were found between two percent and five percent lecithin fed to the birds. Then, it was tentatively concluded that the effect of the mutton fat on the energy and protein utilization was similar to tallow but resulted different tendency with lecithin.

• Journal of Bio-Environment Control
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• v.17 no.1
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• pp.43-50
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• 2008

This study was conducted to investigate the proper supplied conditions of sodium selenate supplied by fertigation to improve functionality of major western vegetables; beet, broccoli, cabbage lettuce, celery, and parsley in highland. In this work, the growth and content of minerals, ascorbic acid, nitrate, and selenium were measured in western vegetables that treated sodium selenate by different concentration, treatment time and treatment frequency. While there was not different in early growth of some western vegetables among different concentration of sodium selenate; 1,2, 5 and $20\;mg{\cdot}L^{-1}$, at 20 days after treatment, the fresh weight was reduced 33% at cabbage lettuce,47% at broccoli, and 74% at parsley compared control in $5\;mg{\cdot}L^{-1}$ treatment. But the fresh weight of beet and celery reduced just 20% and 15% compared control in even $20\;mg{\cdot}L^{-1}$. The ascorbic acid of cabbage lettuce, celery, and beet increased as sodium selenate concentration increased, so that of cabbage lettuce showed 1.2 times compared control in $20\;mg{\cdot}L^{-1}$ treatment and also that of beet and celery increased 10%. But the ascorbic acid of broccoli and parsley was not influenced by treated sodium selenate. As the concentration of sodium selenate increased, the nitrate contents decreased regardless of crops compared control. This reduced effect of nitrate was highest in cabbage lettuce, followed by beet and celery. The mineral contents, such as K, Ca, and Mg, decreased in all crops, as the concentration of sodium selenate increased. The potassium content showed an obvious negative correlationship with the concentrations of sodium selenate regardless of crops, but the magnesium and calcium content did not show significant difference between treatments. The selenium content increased in proportion as increasing sodium selenate concentrations. The broccoli, celery and parsley treated $20\;mg{\cdot}L^{-1}$ sodium selenate showed 24.4 times, 76.4 times, and 560 times higher than control, respectively. When the sodium selenate supplied to some western vegetables in different growth stage, the selenium content increased 1.3 times and 1.4 times higher in early stage than in late stage in cabbage lettuce and broccoli, respectively. However in parsley and celery, the selenium content showed the highest in middle stage. The selenium content increased in proportion as increasing the sodium selenate treatment frequency, but in above 10 times treatment, the increased effect alleviated in parsley, celery, and cabbage lettuce. On the contrary, the selenium content of broccoli increased constantly as treatment frequency increased.

• Sleep Medicine and Psychophysiology
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• v.17 no.1
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• pp.41-49
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• 2010

Unlike the case of adult obstructive sleep apnea syndrome (OSAS), there was no consistent finding on the changes of sleep architecture in childhood OSAS. Further understanding of the sleep electroencephalogram (EEG) should be needed. Non-linear analysis of EEG is particularly useful in giving us a new perspective and in understanding the brain system. The objective of the current study is to compare the sleep architecture and the scaling exponent (${\alpha}$) from detrended fluctuation analysis (DFA) on sleep EEG between OSAS and normal children. Fifteen normal children (8 boys/7 girls, 6.0${\pm}4.3$2.2 years old) and twelve OSAS children (10 boys/2 girls, 6.4${\pm}4.3$3.4 years old) were studied with polysomnography (PSG). Sleep-related variables and OSAS severity indices were obtained. Scaling exponent of DFA were calculated from the EEG channels (C3/A2, C4/A1, O1/A2, and O2/A1), and compared between normal and OSAS children. No difference in sleep architecture was found between OSAS and normal controls except stage 1 sleep (%) and REM sleep latency (min). Stage 1 sleep (%) was significantly higher and REM latency was longer in OSAS group (9.3${\pm}4.3$4.3%, 181.5${\pm}4.3$59.9 min) than in controls (5.6${\pm}4.3$2.8%, 133.5${\pm}4.3$42.0 min). Scaling exponent (${\alpha}$) showed that sleep EEG of OSAS children also followed the 'longrange temporal correlation' characteristics. Value of ${\alpha}$ increased as sleep stages increased from stage 1 to stage 4. Value of ${\alpha}$ from C3/A2, C4/A1, O1/A2, O2/A1 were significantly lower in OSAS than in control (1.36${\pm}4.3$0.05 vs. 1.41${\pm}4.3$0.04, 1.37${\pm}4.3$0.04 vs. 1.41${\pm}4.3$0.04, 1.37${\pm}4.3$0.05 vs. 1.41${\pm}4.3$0.05, and 1.36${\pm}4.3$0.07 vs. 1.41${\pm}4.3$0.05, p<0.05). Higher stage 1 sleep (%) in OSAS children was consistent finding with OSAS adults. Lower $'{\alpha}'$ in OSAS children suggests decrease of self-organized criticality or the decreased piling-up energy of brain system during sleep in OSAS children.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.6
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• pp.315-325
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• 2016

Due to the expansion of data and technical progress in the military industry, it is important to extract meaningful information for assuring quality and making policies. The analysis of trends and decision making based on big data is helpful for increasing productivity in business and finding new business opportunities. We propose an application to collect reliable quality information for munitions and build a big data platform for using the accumulated information and numerical data. We verified the proposed platform using the Test Report Information Service (TRIS) system and suggest a method that utilizes unstructured and semi-structured data accumulated by TRIS. Thus, we expect that the proposed platform will help in building infrastructure for military data, making efficient strategies, and analyzing trends for assuring munitions quality.

• The Korean Journal of Ecology
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• v.27 no.3
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• pp.141-146
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• 2004

This paper reports on Pb and Cd concentrations in the tissues of 76 individuals of 16 rare bird species found dead across Korea. In most of species, Pb concentration was higher in kidney and bone than in liver. The range of the mean liver Pb was 0.47 (Cygnus cygnus)∼3.74 ㎍/wet g (Asio flammeus). Based on hepatic Pb concentrations, 39 (51.3%) of the 76 individuals were classifed as background level (〈2㎍/wet g), 35 (46.1%) were elevated level (〉2㎍/wet g) and 2 (2.6%) were poisoned level (〉10㎍/wet g). These results were indicated many rare birds were suffered from chronic Pb exposure. Cd concentration was generally higher in kidney than in liver and bone. The range of the mean kidney Cd was 0.06 (Bubo bubo)∼l.75㎍/wet g (falco subbuteo). Only one of the 76 individuals had elevated Cd concentration (〉2.7㎍/wet g) in kidney. These results indicated most of rare birds had low Cd accumulations.