• Animal Systematics, Evolution and Diversity
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• 제36권4호
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• pp.382-386
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• 2020

In this study, Prionospio depauperata Imajima, 1990 is newly reported in Korean fauna. Prionospio depauperata can be distinguished from other relatives by the four pairs of branchiae which are pinnate on chaetigers 2 and 5, and apinnate on chaetigers 3 and 4; caruncle extending to the end of chaetiger 2; and moderate dorsal crest present on chaetigers 7-13. The morphological diagnosis of P. depauperata are provided with the photographs of four Prionospio species. The mitochondrial cytochrome c oxidase subunit 1 (CO1), 16S ribosomal DNA (16S rDNA), and the nuclear 18S ribosomal DNA (18S rDNA) sequences of four Prionospio species from Korean waters, P. depauperata Imajima, 1990, P. japonica Okuda, 1935, P. krusadensis Fauvel, 1929, and P. membranacea Imajima, 1990, were determined for the first time. The inter-specific genetic distances among the congeners of four Prionospio species were 22.3-29.6% in CO1, 10.5-25.0% in 16S rDNA, and 0.3-3.6% in 18S rDNA.

• 한국세라믹학회지
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• 제43권2호
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• pp.92-97
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• 2006

Dolomite type $BaSn(BO_3)_2$ ceramics with rhombohedral crystal structure has been synthesized via solid state reaction route. Dielectric properties were measured for the samples sintered at $1050\~1200^{\circ}C$ for 2 h in air. Dielectric constant, loss tangent, and temperature coefficient were increased with sintering temperature due to the evolution of $BaSnO_3$, secondary, phase. Optimum dielectric properties were obtained at the $BaSn(BO_3)_2$ ceramics sintered at $1100^{\circ}C.\;CuO/Bi_2O_3$ was added to $BaSn(BO_3)_2$ ceramics to lower the sintering temperature for LTCC application, then Co and Fe-based coloring agents were added for colorizing the LTCC tape. Typical dielectric properties of $BaSn(BO_3)_2$ ceramics with $5 wt\%\;CuO/Bi_2O_3\;and\;3wt\%$ Co-coloring agent that sintered at $900^{\circ}C$ were $\varepsilon_r=9.89,\;tan{\delta}=0.92\times10^{-3},\;and\;TCC=112ppm/^{\circ}C$. Thus obtained LTCC tape was co-fired with Ag paste for compatibility test and revealed no sign of Ag reaction with the ceramics.

• 천문학회보
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• 제46권1호
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• pp.50.2-51
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• 2021

Stars form exclusively in cold and dense molecular clouds. To fully understand star formation processes, it is hence a key to investigate how molecular clouds form out of the surrounding diffuse atomic gas. With an aim of shedding light in the process of the atomic-to-molecular transition in the interstellar medium, we analyze Arecibo HI emission and absorption spectral pairs along with TRAO/PMO 12CO(1-0) emission spectra toward 58 lines of sight probing in and around molecular clouds in the solar neighborhood, i.e., Perseus, Taurus, and California. 12CO(1-0) is detected from 19 out of 58 lines of sight, and we report the physical properties of HI (e.g., central velocity, spin temperature, and column density) in the vicinity of CO. Our preliminary results show that the velocity difference between the cold HI (Cold Neutral Medium or CNM) and CO (median ~ 0.7 km/s) is on average more than a factor of two smaller than the velocity difference between the warm HI (Warm Neutral Medium or WNM) and CO (median ~ 1.7 km/s). In addition, we find that the CNM tends to become colder (median spin temperature ~ 43 K) and abundant (median CNM fraction ~ 0.55) as it gets closer to CO. These results hints at the evolution of the CNM in the vicinity of CO, implying a close association between the CNM and molecular gas. Finally, in order to examine the role of HI in the formation of molecular gas, we compare the observed CNM properties to the theoretical model by Bialy & Sternberg (2016), where the HI column density for the HI-to-H2 transition point is predicted as a function of density, metallicity, and UV radiation field. Our comparison shows that while the model reproduces the observations reasonably well on average, the observed CNM components with high column densities are much denser than the model prediction. Several sources of this discrepancy, e.g., missing physical and chemical ingredients in the model such as the multi-phase ISM, non-equilibrium chemistry, and turbulence, will be discussed.

• 한국우주과학회:학술대회논문집(한국우주과학회보)
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• 한국우주과학회 2009년도 한국우주과학회보 제18권2호
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• pp.36.1-36.1
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• 2009

We investigate the molecular and atomic gas properties of 20 Virgo cluster spiral galaxies by comparing with optical properties to assess the effect of the Virgo environment on the interstellar media of the Virgo disks. CO maps from FCRAO On-The-Fly (OTF) mapping survey and HI maps from VIVA (VLA Imaging of Virgo spirals in Atomic gas) are shown, and radial properties of molecular and atomic gas are compared. H2 deficiency along with HI is investigated, and gas evolution history of the Virgo cluster spirals is also examined.

• Animal Systematics, Evolution and Diversity
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• 제24권1호
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• pp.9-16
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• 2008

Cerapus longicervicum, a new species of ischyrocerid amphipods, was isolated from the vicinal sea of Deokjeokdo-Island, Incheon (South Korea). This species is characterized by a narrower coxal plate width of gnathopod 1 in male, which is 0.39 times as broad as pereonite 1, and antenna 2, which is longer than antenna 1. This paper also provides the partial sequence of the mitochondrial cytochrome c oxidase subunit 1 (CO1) of the new species, which was obtained from a specimen that was preserved in 4% formalin solution.

• 한국컴퓨터정보학회논문지
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• 제23권11호
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• pp.9-15
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• 2018

The Ministry of National Defense announced 'Defense Reform 2.0' that aims to strengthen the country's security for decrease of regional uncertainties, growing requirements for advanced technologies, and a need for more efficiency in the Republic of Korea(RoK) Armed Forces this year. It said RoK Armed Forces have to change efficiently in preparation for rapid decline in military service resources as demographic cliff turning into reality, and the rapid evolution of the "battlefield environment" caused by developments in military science and technologies. RoK Navy combat Management System(CMS) made by domestic proprietary technology since 2000s and development centered on Agency for Defense Development require design changes for added requirements. So in this paper, I propose method of design a low cost and high efficiency navy CMS architecture based on high performance server and virtualization technology. And I create a test environment for analysis performance and compare the performance of proposed navy CMS and existing navy CMS.

• 한국작물학회지
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• 제41권6호
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• pp.725-728
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• 1996

고려인삼의 광 반응과 호흡에 미치는 잎 온도의 영향을 알아보기 위하여 단기적(short term)으로 조절된 광도에서 조건별로 온도를 1$^{\circ}C$간격으로 3$0^{\circ}C$까지, 암 조건에서는 46$^{\circ}C$까지 증가시켜 그 반응을 살펴보았다. 고려인삼의 Rubisco 활성은 낮은 광도와 잎 온도 조건에서 높은 경향을 보였는데, 광도가 100$\mu$ mol m$^{-2}$ s$^{-1}$에서는 18$^{\circ}C$의 잎온도에서 최고의 활성을 보였으며 이는 200$\mu$ mol m$^{-2}$ s$^{-1}$ 광도에서도 같은 경향으로 나타났다. 그러나 300, 400$\mu$ mol m$^{-2}$ s$^{-1}$에서는 잎 온도 수준이 각각 17$^{\circ}C$와 16$^{\circ}C$에서 최고 반응을 보여 광도증가에 따라 적정온도수준이 감소하는 것으로 나타났다. 반면, 암조건 에서는 28$^{\circ}C$부터 4$0^{\circ}C$까지 호흡량이 급속히 증가하다가 4$0^{\circ}C$ 이후부터는 급속히 감소함을 보였다. 이상의 결과는 잎온도 조절에 따라 광이용효율을 높일 수 있으며 암조건에서의 $CO_2$ 발생량을 줄일 수 있을 것으로 생각된다.

• 한국미생물·생명공학회지
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• 제44권4호
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• pp.529-534
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• 2016

해조류 중 갈조류인 미역으로부터 분리당화발효(SHF)를 위한 전처리 및 효소당화를 검토하고, 기존의 분리당화발효(SHF)를 개선하기 위해 공배양발효(co-culture)를 수행하였다. 비순치 효모와 고농도 mannitol에 순치(adaptive evolution)한 효모를 이용한 공배양발효를 실시한 결과 발효 72시간에 12.2 g/l의 에탄올과 에탄올 수율($Y_{EtOH}$) 0.41을 나타내었다. 이러한 기존의 분리당화발효(SHF)를 개선한 공배양발효를 통해 에탄올 생산 수율이 0.23에서 0.41로 35.2% 증가하였으며, 에탄올 발효시간도 108시간에서 72시간으로 33.3% 감소하였다. 이러한 연구결과는 해양 바이오매스인 해조류로부터 바이오연료 생산과정에 있어 유용한 정보를 제공하는 것으로 판단된다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권8호
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• pp.4092-4104
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• 2017

In this paper, an efficient 4K and 8K UHD(Ultra High Definition) transmission scheme is proposed on the convergence networks with broadcasting and LTE(Long Term Evolution) by using CoMP(Coordinated Multi-Point). A video data is compressed and divided into BL(Base Layer), E(Enhanced layer)1, E2 and E3 by scalable HEVC(High Efficiency Video Coding). The divided layers can be combined by the scalable HEVC such as mobile HD, full HD, 4K and 8K UHD(Ultra High Definition). The divided layers are transmitted through the convergence networks with DVB-T2(Digital Video Broadcasting-$2^{nd}$ Generation Terrestrial) broadcasting system and LTE CoMP. This scheme transmits mobile HD and full HD layers through DVB-T2 broadcasting system by using M-PLP(Multiple-physical Layer Pipes), and adaptively transmits 4K or 8K UHD layer through LTE CoMP with MMT(MPEG Media Transport) server. An adaptive transmitting and receiving scheme in the LTE CoMP system provides 4K or 8K UHD layer to a user according to the user status. The proposed scheme is verified by showing the system-level simulation results which is better BER(bit-error-rate) performance than the conventional scheme. The results show that the proposed scheme provides the stable video contents to the user especially at the cell edge.

• 기술혁신학회지
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• 제14권2호
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• pp.320-342
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• 2011

본 연구는 시스템반도체의 기술혁신패턴의 진화를 지식의 생성방식의 진화와 이에 따른 기업간 관계의 진화라는 관점에서 분석하였다. 특히 설계도구인 EDA의 등장 이후에 지식의 생성방식이 변화하였고 이를 기반으로 기업유형의 진화, 기업간 관계의 진화 풍 기술혁신패턴이 진화하였음을 문헌자료에 대한 검토와 주요 기업에 대한 인터뷰를 통해 분석하였다. 분석결과는 다음과 같다. 첫째, 시스템반도체의 혁신활동은 과거 지식의 축적을 통한 설계활동 중심의 기술개발에서 지식 및 기술활용을 위한 탐색활동 중심의 혁신활동으로 진화하고 있다. 즉, 특정 기능의 구현을 통한 제품개발이 아니라 IP를 활용한 시스템 구축으로 제품개발이 이루어지는 설계활동의 분업화로 지식과 기술의 탐색활동이 중요해지고 있다. 둘째, 지식의 가치가 높아짐에 따라서 지식을 통한 신시장의 창출과 기업간 관계를 통한 신산업, 신기술의 개발이 일어나고 있다. 동시에 기존의 설계활동보다 설계비용 절감과 설계기간이 단축되면서 시장과 기술의 진화에 더욱 효과적으로 대응할 수 있는 기업유형으로 전문적 분업화가 일어나고 있다. 셋째, 지식의 활용측면이 점차적으로 강조됨에 따라 기업간 네트워크는 다른 기업과의 상호보완적인 기술개발구조를 구축하기 위해 다양하게 형성되고 있다. 이러한 논의는 국내외 기업간 네트워크를 전략적으로 활용하고, 시장창출과 지식활용 등 탐색활동을 위한 제반 전략이 강구되어야 함을 시사한다.