• Ocean and Polar Research
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• 제36권1호
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• pp.1-12
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• 2014

This study investigates spatial and temporal variations in the generation and propagation of internal tides around the Korea Strait using a three-dimensional high resolution model (Regional Ocean Modeling System; ROMS). The model results were verified through comparison with in-situ current measurements from an array of 12 acoustic Doppler current profilers (ADCPs) deployed in the Korea Strait. Fluxes and distributions of internal tidal energy were calculated using simulation results gathered in February and August. Our analyses reveal that energetic semidiurnal internal tides are generated in a region around the Korea Strait shelf break ($35.5^{\circ}N$, $130^{\circ}{\sim}130.5^{\circ}E$), where the strong cross-slope semidiurnal barotropic tidal currents interact with a sudden topographical change. The semidiurnal internal tidal energy generated in summer displays values about twice as large as values in winter. Propagation of semidiurnal internal tides also reveals seasonal variability. In February, most of the semidiurnal internal tides propagate only into the open basin of the East Sea due to weak stratification in the Korea Strait, which inhibits their southwestward propagation. In August, they propagate southwestward to $35.2^{\circ}N$ along the western channel of the Korea Strait because of strong stratification. In addition, semidiurnal internal tides generated in a region west of Tsushima Island are found to propagate to the coast of Busan. This can be explained by the intensified stratification due to the strong intrusion of bottom cold water in the western channel of the Korea Strait during summer.

• 자원환경지질
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• 제33권5호
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• pp.425-434
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• 2000

The 3.5 KHz seismic survey was carried out for studying the distribution pattern of the unconsolidated sediments of the Yeosu Sound on the southern coast of the Korean Peninsula. Field data originally recorded in analog are converted and processed digitally to recover the high-resolution acoustic profiles. Across the north-south trending channel with the depth of 20~30 m, different seismic facies types are observed in the top section of sediments. The western part is characterized by the continuous high-amplitude subparallel reflectors within which the acoustic turbidity as a token of the presence of gas is commonly observed, whereas the counterpart largely shows poor reflectors and has shallow acoustic basement toward the north. The dissimilarity of the seismic expression across the channel can be interpreted as the result of the change of depositional environment caused by relative sea-level fluctuations of the late-Quaternary. During the last glacial period, the Yeosu Sound was exposed and eroded by the paleo-Seomjin River. By the following rapid rise of sea level, it was covered by the transgressive sand sheet. When the sea level reached near the present position, the muddy sediment has accumulated only in the western part of the Yeosu Sound as its depositional front has moved toward the north. It is partly caused by the asymmetrical tidal current in the Yeosu Sound where the flood near the bottom has stronger current flow and contains more suspended sediments.

• 한국해안해양공학회지
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• 제7권1호
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• pp.126-134
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• 1995

국립수산진흥원이 관측한 염분자료를 분석하여 여름철 남해의 저염화 현상을 규명하였다. 6월과 8월에 남해 전 수심의 저염화는 강수량과 강물의 유입으로는 설명될 수 없고, 주위 해역 중 유일하게 저염수가 존재하는 제주해협 서편 해역 저염수의 유입으로만 설명이 가능하다. 염보존 Box 모델의 결과에 의하면, 대한해협 서수도의 수송량을 1.4-2.0$\times$$10^{6}$ ㎥/sec이라고 할 때, 이 수송량의 31-36% 정도인 0.5-0.6$\times$$10^{6}$ ㎥/sec(평균유속은 10-13cm/sec)의 수송량이 제주해협을 경유하여 남해로 유입되고, 나머지는 제주도와 대마도 사이로 유입된다.

• 한국해양학회지:바다
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• 제28권2호
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• pp.63-93
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• 2023

이 연구는 황·동중국해와 동해 울릉분지 사이에 위치한 수로를 대한해협(Korea Strait)으로 명명한 역사적 사실을 바탕으로 향후 국내 연구자들이 활용할 수 있는 일관된 명명법과 지리적 영역을 제시하였다. 국제적으로 대한해협으로 알려진 이 수역은 일상에서 보통 남해로 불리지만, 역사적 근거에 기초하여 대한해협으로 불리는 것이 바람직하다. 이러한 권장안 사용을 뒷받침하기 위해, 먼저 우리나라 주변해역에 대한 고지도, 고해도, IHO 특별간행물(S-23) 등을 분석하여 과거 대한해협의 공간범위를 정의하였고, 대한해협과 대한해협 내 서수도·동수도 지명들의 변천 과정을 조사하였다. 이를 바탕으로 지난 17년(2005-2021년) 간 Ocean Science Journal (OSJ)과 Journal of Oceanography (JO)에 실린 논문들 중 지도에 Korea Strait 또는 관련 지명(South Sea, Korea/Tsushima Straits, Tsushima Strait)을 표기한 논문들을 분석하여 연구자들의 대한해협 지명 표기와 그 공간적 위치에 대한 인식을 조사하였다. OSJ의 경우에 42.9%가 'Korea Strait'를 표기한 반면에 JO의 경우 60.4%가 'Tsushima Strait'를 표기하였다. 하지만, OSJ에는 'Tsushima Strait'를 단독으로 표기한 논문이 한 편도 없었으나, JO에는 7.5%가 'Korea Strait'를 단독으로 표기하였다. 두 국제학술지에서 실린 'Korea Strait' 지명 표기 위치는 크게 5가지 형태로 분류되었다. 즉, 각 논문에서는 대한해협을 광의의 대한해협 영역(Type 1), 울릉분지와 대마도 사이(Type 2), 대한해협 내 서수도(Type 3-1), 대한해협 내 동수도(Type 3-2), 대한해협 내 서·동수도(Type 4)에 표기하고 있었다. 이 중 Type 1이 OSJ의 경우 71.4%를, JO의 경우 60.4%를 차지하여, 광의의 대한해협 영역에 가장 빈번하게 이 해협의 이름을 표기하고 있었다. 끝으로 현재 대한해협을 흐르는 해류의 명칭이 국제적으로 '대한난류'가 아닌 '대마난류' 즉 대한해협 지명에서 비롯하지 않은 명칭이라는 사실에 관해 논의하였다.

• 동의생리병리학회지
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• 제19권6호
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• pp.1689-1693
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• 2005

In this case, it is considered that the cause of the lower limb Flaccidity-syndrome is the peripheral neuropathy accompanied with inflammation and in oriental medicine, it is understood that the factors such as lung fluid consumption caused by heat-evil, wetness-heat evil cause the lower limb Flaccidity-syndrome. Because the peripheral neuropathy is regarded as a neuropathy with a series of inflammation reaction producing inflammatory neuropeptides such as substance P, prostaglandin ect., in western medicine, nonsteroidal antiinflammation drug;NASID, lidocaine, capsaicine are prescribed to control this neuropathy. In the view of treatment of the lower limb weakness, Wooseul-tangkami is used to remove the wetness-heat evil and we had a electronic acupuncture on the Yangmyung channel(陽明經) selected in The Yellow Emperor's of internal Medicine and also on Panggwang channel(膀胱經) considered as painful lesion. We experineced a case of the lower limb Flaccidity-syndrome diagnosed as the peripheral neuropathy the patient was treated by wooseul-tangkami, a acupuncture on Yangmyung channel and also Panggwang channel and had a significant improvement in gait ability and the range of motion.

• The Korean Journal of Physiology and Pharmacology
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• 제23권2호
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• pp.95-102
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• 2019

Endoplasmic reticulum (ER) stress is mediated by disturbance of $Ca^{2+}$ homeostasis. The store-operated calcium (SOC) channel is the primary $Ca^{2+}$ channel in non-excitable cells, but its participation in agent-induced ER stress is not clear. In this study, the effects of tunicamycin on $Ca^{2+}$ influx in human umbilical vein endothelial cells (HUVECs) were observed with the fluorescent probe Fluo-4 AM. The effect of tunicamycin on the expression of the unfolded protein response (UPR)-related proteins BiP and CHOP was assayed by western blotting with or without inhibition of Orai1. Tunicamycin induced endothelial dysfunction by activating ER stress. Orai1 expression and the influx of extracellular $Ca^{2+}$ in HUVECs were both upregulated during ER stress. The SOC channel inhibitor SKF96365 reversed tunicamycin-induced endothelial cell dysfunction by inhibiting ER stress. Regulation of tunicamycin-induced ER stress by Orai1 indicates that modification of Orai1 activity may have therapeutic value for conditions with ER stress-induced endothelial dysfunction.

• 분석과 대안
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• 제1권2호
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• pp.13-30
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• 2017

Referred to as a 'media war,' there is a fierce competition for media discourse between different countries. Twenty four hour global news channels like Al Jazeera, France 24, RT, NHK World, China's CCTV and teleSUR emerged to offer their own perspectives and stance in the global society, and to face the monopolization and distorted information created by the hegemony of English news channels which have swayed international public opinions for a long time. As a tool of public diplomacy, the media's role in determining the image of the nation and winning the 'Hearts and Minds' of the international community is decisive, but it cannot be said that they all have a similar influence or play a positive role in media diplomacy. A global news channel, which is both a media diplomatic subject and a journalism organization, can be in the position of acting as a public relations organization or a propaganda agency for the government depending on the regime's attitude because most of global news channels receive support from the government. Sometimes it is difficult for these media to implement quality journalism because of financial difficulties. Media discourse also has limitations in that it is dependent upon changes in foreign policy of its own government. This study examines the current status of global news channels, the dilemma these channels are facing, and suggests some potential directions that can be taken by global news channels in order to become more effective. It is becoming increasingly important for all nations to respond to distorted information about their own countries, to appropriately identify various issues and changes in the international community and to convey their views and positions to the international community. For now, there is a lack of awareness about the importance of media diplomacy in Korea: There are many English-language media, but as yet no global news channel which could have an influence on the international stage. However, there seems to be some understanding about the need for the media to present the Korean alternative discourse to the senseless dependency on Western media. We hope that this study will be an opportunity to think in depth about the attitude of the Korean global media, whether existing global media or new global news channels, in order to help them become more effective in media diplomacy.

• 한국동물생명공학회지
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• 제38권4호
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• pp.291-299
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• 2023

Background: Leydig cells, crucial for testosterone production, express ion channels like ANO1 that influence hormone secretion. This study investigates the expression and role of the Tandem of P domains in a weak inward rectifying K⁺ channel-related Acid-Sensitive K⁺-1 (TASK-1) channel in these cells, exploring its impact on testicular function and steroidogenesis. Methods: TASK-1 expression in Leydig cells was confirmed using immunostaining, while RT-PCR and Western Blot (WB) validated its expression in the TM3 Leydig cell line. The effect of a TASK-1 channel blocker on cell viability was assessed through live/dead staining and MTT assays. Additionally, the blocker's effect on testosterone secretion was evaluated by measuring testosterone levels. Results: Immunohistochemical analysis revealed a predominant presence of TASK-1, along with c-Kit and ANO-1, in Leydig cells adjacent to seminiferous tubules and also in Sertoli and spermatogenic cells. Expression levels of TASK-1 mRNA and protein were significantly higher in TM3 Leydig cells compared to TM4 Sertoli cells. In addition, blocking TASK-1 in TM3 cells with ML365 induced cell death but did not affect LH-induced testosterone secretion. Conclusions: These findings suggest that TASK-1 in Leydig cells is crucial for their viability and proliferation, highlighting its potential importance in testicular physiology.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2007년도 춘계학술대회
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• pp.507-510
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• 2007

Piston cores retrieved from the western Ulleung Basin, East Sea were analyzed to examine the potential for hydrocarbon generation and to determine the hydrocarbon indicators. 2D multi-channel reflection seismic and Chirp data were also investigated for mapping and characterizing the geophysical hydrocarbon indicators such as BSR (bottom simulating reflector), blank zone, pock-mark etc. High organic carbon contents and sedimentation rates that suggest good condition for hydrocarbon generation. High pressure and low temperature condition, and high residual hydrocarbon concentrations are favor the formation of natural gas hydrate. In the piston cores, cracks generally oriented to bedding may indicate the gas expansion. The seismic data show several BSRs that are associated with natural gas hydrates and underlying free gas. A number of vertical to sub-vertical blank zones were well identified in the seismic sections. They often show the seismic pull-up structures, probably indicating the presence of high velocity hydrates. Numerous pockmarks were also observed in the Chirp profiles. They may indicate the presence of free gas below the hydrate stability zone as well.

• 한국수정란이식학회지
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• 제30권1호
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• pp.17-21
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• 2015

Alteration in ion channel or transporter expression levels affects cell volume which is produced by movement of water and ion across the plasma membrane. In particular, aquaporin (AQP) channels among ion channels play a crucial role in movement of water across the cell membrane. This study was performed to identify whether AQP expression is changed in bovine follicular cystic follicles using microarray, RT-PCR and Western blotting analyses. In microarray data, AQP4 expression was decreased, whereas AQP7 was increased in cystic follicles. Additional experiments were focused on the AQP7 expression increased in cystic follicles. The microarray data was confirmed by semi-quantitative polymerase chain reaction (PCR) and Western blot analysis. AQP7 mRNA and protein expressions were significantly increased in the cystic follicles (p<0.05). Application of estrogen ($10{\mu}g/ml$) to bovine ovarian cells showed a trend of increase in AQP7 expression. From these results, we suggest that the increase in AQP7 expression in cystic follicles may play an important role in movement of water in bovine ovary. In addition, AQP7, a aquaglyceroporin permeating water and glycerol, could be a good target in development of methods for the cryopreservation of bovine ovary.