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Spring migration of mallards (Anas platyrhynchos) tracked with wild-trackers in East Asia
강태한,강영명,정우석,문운경,윤하청,최지다,이한수 국립중앙과학관 2016 Journal of Asia-Pacific Biodiversity Vol.9 No.3
Mallard is a dominant waterfowl species wintered in Korea. We researched the mallard spring migration route, stopover sites, and breeding sites. We used cannon nets in Central Korea to catch and attach 10 wild trackers (WT-200). The mallards’ spring departure dates were from the end of March to early April. The spring migration route varied by individual mallards, with most moving through the North Korean east coast. Breeding sites were distributed among the interior of Northeastern China. The average distance to the breeding areas was 1,265 km [standard deviation (SD) = 491 km] and the average days spent from wintering site to breeding site was 25.3 days (SD = 19.2 days). The mallards used several stopover sites when on the spring migration route (average 3.3 ± 2.1, range 2–9). The time spent at the stopover sites was a minimum of 1 day to a maximum of 16 days. Wintering mallards in Korea showed various individual trends regarding spring migration timing, migration route, stopover sites, and usage days.
공작 기계의 신뢰성 평가를 위한 웹 기반 해석 프로그램 개발
강태한,김봉석,이수훈,송준엽,강재훈 한국공작기계학회 2004 한국공작기계학회 추계학술대회논문집 Vol.2004 No.-
Web-based analysis programs for reliability assessment of machine tools were developed in this study. First, the reliability data analysis program was developed to search for failure rate using failure data and reliability test data of mechanical part. Second, failure mode analysis was developed through performance tests like circular movement test vibration test for machine tools. This analysis program shows correlation between failure mode and performance test result. Third, tool life was predicted by correlation between flank wear and cutting time, using the extended Taylor tool life equation in turning data and the equivalently converted equation in order to apply ball endmill data to Taylor tool life equation in milling data. All the information related to input and result data can be stored in theses programs.
강태한,이두표 호남대학교산업기술연구소 2011 산업기술연구논문집 Vol.17 No.-
본 연구는 광주광역시 도시구간을 흐르는 영산강 일대의 조류상과 분포특성을 파악하고자, 조사지역 6개소를 선정하여 2001년 12월부터 2002년 11월 사이에 계절별로 1회씩 조류센서스를 실시하고 서식환경을 조사하였다. 총 78종 12,170개체가 관찰되었으며 겨울철에 58종 5,979개체로 가장 많은 종과 개체수 관찰되었다. 우점종은 쇠오리, 붉은머리오목눈이, 흰빰검둥오리, 참새, 멧비둘기, 찌르레기 등으로 나타났다. 전체 종다양도는 3.03으로 나타났으며, 계절별로는 봄철이 2.74로 가장 높았다. 종 조성 분석결과, 수면성 오리류가 38.1%, 산림조류가 35.4%, 백로류가 12.5%, 섭금류가 2.35%, 맹금류가0.25%, 잠수성 오리류가 0.06%를 차지하였다. 본 연구결과 조류상은 전반적으로 하천수계의 특징을 보여주지만, 조류의 분포는 서식지 구성요소 중 교목과 관목의 비율이 높은 지역의 경우 산림성 조류가 우점하는 분포특성을 보였다. 이러한 결과는 산림조류의 보호 및 다양성 증진 측면에서 둔치의 식생보존이 매우 중요하다는 사실을 암시한다. This study was carried out to understand the characteristics of distribution and avifauna in an urban area of Yeongsan river. Bird censuses were conducted seasonally at six sites of the river in Gwangju metropolitan city between Dec. 2001 and Nov. 2002. And habitat composition was investigated simultaneously. A total of 78 species and 12,170 individuals was recorded. Of the four seasons, winter showed the highest count with 5,979 individuals of 58 species. The most dominant species was Anas crecca(18.1%), followed by Paradoxornis webbiana(10.8%), Anas poecilorh-yncha(10.6%), Passer montanus(7.0%), Streptopelia orientalis(6.9%) and Sturnus cineraceus(5.0%). Species diversity index was 3.03 in total of four seasons, and was the highest in spring at 2.74 seasonally. In the species composition, dabbling ducks occupied 38.1%, forest birds 35.4%, herons 12.5%, shorebirds 2.35%, raptors 0.25% and diving ducks 0.06%. Overall, the avifauna of this study area showed the characteristics of river ecosystem. Nevertheless the distribution of birds in relation to habitat composition showed the terrestrial bird group is more plentiful than water bird group in the area with a high proportion of wood and shrub. This result suggests that the preservation of waterside vegetation is very important in aspect of the promotion of bird diversity and the protection of forest birds.
강태한,이상보,이한수,백운기,유재평,진선덕 한국환경생물학회 2019 환경생물 : 환경생물학회지 Vol.37 No.4
독수리 11개체에 GPS를 부착하여 비행특성을 분석하였다. 한국에 월동기간은 평균 131일 (SD=17.4)이었고, 평균 비상 비율은 19.6%이었다. 비행고도는 100 m 이하가 21.6%이었으며, 101~200 m는 25.3%, 201~300 m는 19.0%로, 300 m 이하가 65.9%이었다. 시간대별 비상률과 고도는 양의 상관관계 (r=0.929)를 보였고, 월별 비행고도 비율은 대부분 101~200 m에 가장 많은 비율을 나타냈다(p<0.05). 월동기 독수리는 비행비율을 낮추고 300 m 이하 고도에서 비행하였다. 독수리의 넓은 행동권, 높은 비행비율, 높은 고도 비행특성은 사회적 상호작용에 의해 먹이를 찾는 효율적인 비행방법으로 판단된다. The flight characteristics of 11 cinereous vultures (Aegypius monachus) were analyzed by a global positioning system (GPS) tracker (WT - 300; KoEco, Inc.). The wintering period in Korea averaged 131 days (SD=17.4) and the average flight rate was 19.6%. The flight altitude was below 100 m for 21.6% of the flight, 101-200 m for 25.3%, 201-300 m for 19.0%, and below 300 m for 65.9%. There was a positive correlation (r=0.929) between the hourly flight rate and altitude. The predominant monthly flight altitude was 101-200 m (p<0.05). The wintering cinereous vultures lowered their flight rate and flew at an altitude of less than 300 m. This is thought to be an efficient way to find food through social interaction.
강태리,Kang, Tae-Ri 경락경혈학회 2019 대한침구의학회지 Vol.36 No.4
Objectives : The purpose of this study was to examine the effects of electroacupuncture at GB14, on brain activity assessed on an electroencephalogram(EEG). Methods : (1) Thirty-four healthy participants were randomly divided into two groups, receiving either real acupuncture or non-penetrating sham acupuncture at GB14. (2) EEG measurements were conducted simultaneously before and after a 5-minute electroacupuncture stimulation, and the differences in the resulting EEG parameters were compared between the test and control groups. Results : (1) Absolute power increased significantly in the theta-wave channel of the occipital region and in the entire alpha-wave channel. (2) Relative power decreased significantly in the theta-wave channels of the frontal and occipital regions. (3) Coherence decreased significantly in the theta- and beta-wave channels of the parietal and occipital regions, and increased significantly in the alpha-wave channels of most areas. Conclusions : This study shows that electroacupuncture stimulation at GB14 activates the alpha frequency band in particular.
강태인,이승준,권영희,박동은 한국분자세포생물학회 2019 Molecules and cells Vol.42 No.8
βPix is a guanine nucleotide exchange factor for the Rho family small GTPases, Rac1 and Cdc42. It is known to regulate focal adhesion dynamics and cell migration. However, the in vivo role of βPix is currently not well understood. Here, we report the production and characterization of βPix-KO mice. Loss of βPix results in embryonic lethality accompanied by abnormal developmental features, such as incomplete neural tube closure, impaired axial rotation, and failure of allantoischorion fusion. We also generated βPix-KO mouse embryonic fibroblasts (MEFs) to examine βPix function in mouse fibroblasts. βPix-KO MEFs exhibit decreased Rac1 activity, and defects in cell spreading and platelet-derived growth factor (PDGF)-induced ruffle formation and chemotaxis. The average size of focal adhesions is increased in βPix-KO MEFs. Interestingly, βPix-KO MEFs showed increased motility in random migration and rapid wound healing with elevated levels of MLC2 phosphorylation. Taken together, our data demonstrate that βPix plays essential roles in early embryonic development, cell spreading, and cell migration in fibroblasts.