• Applied Microscopy
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• v.9 no.1
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• pp.21-34
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• 1979

The cyclic changes of the epithelium of seminiferous tubule in the Korean greater horseshoe bat (Rhinolophus ferrumequinum korai) were investigated by means of the light and electron microscopic observations and the following results were obtained. 1) The spermatogenic function of the horseshoe bats captured in September was moderate but considerable amount of the ultrastructural findings were obtained in both the spermatocytogenic and the spermiogenic phases. 2) The spermatogenic function of the horseshoe bats captured in December was depressed representing a resting status. 3) The light and electron microscopic findings suggest that the epithelium of seminiferous tubule varies cyclically, which is closely related to their peculiar way of reproductive habit during hibernation.

• Proceedings of the Korean Society of Computer Information Conference
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• 2012.07a
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• pp.3-6
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• 2012

소셜 네트워크와 웹 2.0의 등장은 거대한 데이터 홍수를 초래하였다. 이 와 관련된 다양한 기술들이 연구 개발되고 있으며 특히 동시에 요구되는 data를 처리하기위한 여러 기술이 등장하였다. 본 연구에서는 다양한 BigData 분산처리 기술들중에 가장 각광 받고 있는 Hadoop이라는 기술을 연구 분석할 것이다. 국내에 아직 많은 사용자가 없어 그 존재감이 많이 없다가 요즘 들어 상승하고 있는 추세이며 이러한 Hadoop의 흐름속에 data의 분산과 병렬처리에서 발생되는 문제점을 분석하고 이를 해결할수 있는 모델을 제시하여 새로운 모델의 하둡으로 기본적인 핵심기술인 federation을 쉽게 할 수 있고 향후 이 구조의 기능과 상세모델을 연구하고 구현하여 제안된 연구 구조의 우수성을 입증하고자 한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.11a
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• pp.1344-1347
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• 2008

VSAT시스템은 중심지구국, 무궁화위성 그리고 다수의 단말지구국을 포함하는 성형망으로 구성되고, 광범위한 데이터서비스를 제공할 수 있으며 사용자의 사용목적과 용도에 따라서 여러 가지 형태의 위성전송망 구성이 가능하다. 홍수경보망을 구성 시 최적의 전송품질을 구현하기 위한 위성링크설계는 한국의 환경특성, 무궁화위성의 특성 그리고 VSAT 시스템의 특성을 고려하여 설계한다. VSAT 시스템은 디지털 데이터 전송용으로 인바운드(Inbound)는 TDMA, 아웃바운드(Outbound)는 TDM 전송방식을 이용하였으며 중심국과 단말국의 크기는 3.7m, 1.2m로 설계되었다. VSAT망에서 링크설계는 VSAT망에 할당된 위성 중계기(Satellite Transponder)의 출력전력 및 대역폭 범위 내에서 중심지구국(Hub Station)과 단말지구국(Remote Station)이 주어진 전송규격에 따라 정보를 효율적으로 전송할 수 있도록 설계하여. VSAT망으로 홍수관리의 효율적 운영을 제안한다.

• Molecules and Cells
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• v.47 no.2
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• pp.100030.1-100030.14
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• 2024

Both brown and white adipose tissues (BAT/WAT) are innervated by the peripheral nervous system, including efferent sympathetic nerves that communicate from the brain/central nervous system out to the tissue, and afferent sensory nerves that communicate from the tissue back to the brain and locally release neuropeptides to the tissue upon stimulation. This bidirectional neural communication is important for energy balance and metabolic control, as well as maintaining adipose tissue health through processes like browning (development of metabolically healthy brown adipocytes in WAT), thermogenesis, lipolysis, and adipogenesis. Decades of sensory nerve denervation studies have demonstrated the particular importance of adipose sensory nerves for brown adipose tissue and WAT functions, but far less is known about the tissue's sensory innervation compared to the better-studied sympathetic nerves and their neurotransmitter norepinephrine. In this review, we cover what is known and not yet known about sensory nerve activities in adipose, focusing on their effector neuropeptide actions in the tissue.

• Parasites, Hosts and Diseases
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• v.42 no.4
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• pp.201-203
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• 2004

A survey was conducted to determine the extent of intestinal parasite infection in Bat Dambang, Cambodia in March 2004. A total of 623 fecal specimens was collected from kindergarten and schoolchildren and examined using the formalin-ether sedimentation technique. The overall infection rate of intestinal parasites was 25.7% (boys, 26.2%; girls, 25.1%), and the infection rates of intestinal helminthes by species were as follows: Echinostoma sp. 4.8%, hookworm 3.4%, Hymenolepis nana 1.3%, and Rhabditis sp. 1.3%. The infection rates of intestinal protozoa were; Entamoeba coli 4.8%, Giardia lamblia 2.9%, Iodamoeba butschlii 1.4%, Entamoeba polecki 1.1 %, and Entamoeba histolytica 0.8%. There were no egg positive cases of Ascaris lumbricoides or Trichuris trichiura. All children infected were treated with albendazole, praziquantel, or metronidazole according to parasite species. The results showed that intestinal parasites are highly endemic in Bat Dambang, Cambodia.

• Applied Microscopy
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• v.30 no.1
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• pp.21-44
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• 2000

This study was carried out to investigate sperm storage, and the fate of spermatozoa in the female reproductive tract during hibernation in Korean greater horseshoe bat, Rhinolophus ferrumequinum korai. (1) Numerous sperm occurring in uterine lumen and glands were engulfed, and disappeared by the polymorphouclear leucocytes during the hibernation. (2) The stored sperm present in caudal isthmus of oviduct only, the heads of sperm toward the oviductal epithelial cells. Therefore, the projected sperm during the mating season are only alive in the caudal isthmus of oviduct in the long hibernation. The present result suggests that the caudal isthmus of oviduct may play an important role as the principal storage site in capacitation of sperm. (3) In March, the sperm do not occur in the caudal isthmus of oviduct. It suggests that the stored sperm in the caudal isthmus of oviduct should migrate to the ampulla of the site of fertilization to meet ovum in the period of ovulation. The results of this experiment consider that prolonged sperm storage, fate of sperm and sperm migration in the long hibernation have a kind of mechanism for the fertilization.

• Korean Journal of Agricultural and Forest Meteorology
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• v.1 no.2
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• pp.135-141
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• 1999

The information on agricultural weather over the Korean Peninsula was produced, using the Bio-sphere-Atmosphere Transfer Scheme(BATS). We modified the input and output portions of BATS such that the whole processes can be excuted as a package. Based on this approach, automatic production system of agricultural meteorology information was developed. The results of this model was compared with the observed data. The differences between the model results and observed data for surface temperature, rooting zone temperature and top soil temperature were 2.0$^{\circ}$C, 2.0$^{\circ}$C and 2.6$^{\circ}$C, respectively.

• Journal of Korea Entertainment Industry Association
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• v.14 no.7
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• pp.511-518
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• 2020

The purpose of this study was to provide useful data for clinical occupational therapy by examining the correlation between the use of affected and unaffected sides measured using an accelerometer and upper limb function in chronic stroke patients. In this study, accelerometer, Fugle-Meyer Assessment(FMA), Motor Activity Log(MAL), and Yonsei-Bilateral Activity Test(Y-BAT) was measured on 40 stroke patients who were hospitalized in Won-ju city Y hospital between May 2, 2019 and July 18, 2020. As a result of the study, there was a significant negative correlation between amount of use on the unaffected side and FMA and MAL's Amount of Use(AOU), Quality of Movement(QOM), the quality and satisfaction of performing both hands through Y-BAT. The amount of use on the affected side showed a significant positive correlation with FMA and MAL's AOU, QOM, satisfaction of performing both hands. This study is meaningful in that it suggested the possibility that the actual amount of use on the affected and unaffected side measured using an accelerometer could be used as an evaluation item for upper limb function in stroke patients.

• The Bulletin of The Korean Astronomical Society
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• v.41 no.2
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• pp.34.1-34.1
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• 2016

The ultra hard X-ray band (14-195 keV) provides an important and unbiased way to understand black hole growth and relationship to the host galaxy. The Burst Alert Telescope (BAT) instrument on the Swift satellite has surveyed sky to unprecedented sensitivity, improving the number of known hard X-ray sources by more than a factor of 20 to 836 nearby AGN. The BAT AGN Spectroscopic Survey (BASS) is a study for the first large (N>600) and complete sample of ultra hard X-ray selected AGN with optical spectroscopy. In this talk, I present the observed relationship between black hole mass, bolometric luminosity, and Eddington ratio with optical emission line ratios. We show that [NII]/Ha ratio exhibits a significant correlation with Eddington ratio. We propose that the [NII]/Ha ratio is a useful indicator of Eddington ratio with 0.6 dex of scatter, and that it can be used to measure Eddington ratio and thus black hole mass from the measured bolometric luminosity, even for high redshift obscured AGN.

• BMB Reports
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• v.53 no.3
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• pp.142-147
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• 2020

Lipid accumulation in white adipose tissue is the key contributor to the obesity and orchestrates numerous metabolic health problems such as type 2 diabetes, hypertension, atherosclerosis, and cancer. Nonetheless, the prevention and treatment of obesity are still inadequate. Recently, scientists found that brown adipose tissue (BAT) in adult humans has functions that are diametrically opposite to those of white adipose tissue and that BAT holds promise for a new strategy to counteract obesity. In this study, we evaluated the potential of sinapic acid (SA) to promote the thermogenic program and lipolysis in BAT. SA treatment of brown adipocytes induced the expression of brown-adipocyte activation-related genes such as Ucp1, Pgc-1α, and Prdm16. Furthermore, structural analysis and western blot revealed that SA upregulates protein kinase A (PKA) phosphorylation with competitive inhibition by a pan-PKA inhibitor, H89. SA binds to the adenosine triphosphate (ATP) site on the PKA catalytic subunit where H89 binds specifically. PKA-cat-α1 gene-silencing experiments confirmed that SA activates the thermogenic program via a mechanism involving PKA and cyclic AMP response element-binding protein (CREB) signaling. Moreover, SA treatment promoted lipolysis via a PKA/p38-mediated pathway. Our findings may allow us to open a new avenue of strategies against obesity and need further investigation.