• Korean Journal of Environment and Ecology
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• v.16 no.4
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• pp.387-403
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• 2003

The vascular plants in Manbokdae-Yeowonjae section of the Baekdudaegan were consisted of 502 taxa; 104 families,305 genus,439 species, 60 varieties, 3 forma. From the floristic point of view, the Baekdudaegan of Manbokdae-Yeowonjae section belongs to the southern province in Korea. The rare and endangered plants designated by Korea Forest Service were Abies koreana, Pedicularis verticillata, Patrinia saniculaefolia, Hololeion maximowiczii, Lilium callolsum, Paeonia obovate, Tricyrtis dizutata and VioEa diamantica, and Cymbidium goeringii. The Korean endemic species were Abies koreana, Patrinia saniculaefolia, Vicia unijuga, Stewartia koreana, Cornus walteri, Weigela subsessilis, Saussurea seoulensis, Tyicyrtis dilatata, Hosta capitata, Clematis trichotoma et at.

• Korean Journal of Environment and Ecology
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• v.16 no.4
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• pp.345-358
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• 2003

The vascular plant species in the areas of Gonamsan and Shiribong in the Baekdudaegan were summarized as 295 texa: 89 families, 193 genus, 245 species, 44 varieties and 6 forms.10 taxa were recorded in the surveyed areas as the Korean endemic plants: Hosta capitat (Liliacease), Polygonatum lasianthum var. corenum (Liliaceae), Chloranthus japonicus (Cloranthaceae), Salix hulteni (Salicaoeae), Clematis richotoma (Ranunculaceae), Spiraea prunifolia for. simpliciflora (Rosaceae), Vicia unijuga (Fabaceae), Viola albida (Violaceae), cornus walter(Cornaceae), Weigela subsessilis (Caprifoliaceae).According to the list of Korean rare and endangered plants complied in the studied areas:Iris ensata var. spoyanea(Iridaceae), Viola albida (Vioaceae) and Aristolochia contorta (aristolochiaceae) Due to the rapid destruction and increase of visitors and the studied areas are located close to the villages, the naturalized plant species in the areas were more frequently appeared than the rare and endangered plant species.

• Korean Journal of Environment and Ecology
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• v.16 no.3
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• pp.296-308
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• 2002

The vascular plants in Mt. Cheongwan, Jangheung-gun, Jeollanam-do, were consisted of 599 taxa; 117 families, 366 genus, 519 species, 76 varieties and 4 forma. From the floristic point of view, Mt. Cheongwan is distributed to both the evergreen trees as Pteris mulfida, Dryopteris bissetiana, Torreya nucifera, Cephlotaxus koreana, Neolitsea sericea, Quercus acuta, Hedera rhombea, Fatsia japonica, Camellia japonica, Eurya japonica, Thea sinensis, Acorus gramineus, Pseudosasa japonica and Sasa borealis, and the deciduous subtropical trees such as Carpinus coreana, Aphanth aspera, Orixa japonica, and Lygodium japonicum And it is worth special mention to be discovered Selaginella rossii, Corylopsis coreana, Stewartia koreana, Asarum sieboldii, Viola orientals, and Drosera royundifolia. The Specific plants which is categorized to the Degree by the Ministry of Environment recorded as 45 taxa; 1 species each for the Degree II, IV and V, 5 species for the Degree III, and 37 species for the Degree I.

• JOURNAL OF ELECTRICAL WORLD
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• s.283
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• pp.62-67
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• 2000

미국전기전자학회(IEEE)의 1999년도 파워 엔지니어링 소사이어티(PES) 윈터 미팅이 미국 뉴욕시에서 개최되었으며, 여기에서는 고압직류(HVDC)송전 기술이 21세기의 에너지개발 프로그램에서 수행하게 될 역할에 대한 발표가 있었다. 패널리스트들은 HVCD 기술이 앞으로 어떻게 활용될 것이며, 직류송전의 유리한 점을 적용시킬 수 있는 전세계의 지역, 기대되는 HVDC 기술의 혁신 그리고 이들이 민간주도로 이루어질 수 있을 것인가에 대하여 초점을 맞추었다. 그들을 또한 전력공급산업에 나타나고 있는 HVDC 송전연계 시스템에 대한 규제철폐의 충격에 대하여 토의하였으며, 기술혁신이 직류 변환소이 건설비를 감축시킬 수 있을 것인지에 대한 논의도 있었다. 제기된 문제에는 아래의 것이 포함되어 있다. - 기설 교류 송전시스템을 직류방식으로 전환시키는 상황이 발생할 수 있을 것인가? -투자자 소유의 독집 직류방식 송전선로 프로젝트가 실현될 수 있을 것인가? -시스템 성능을 본질적으로 개선 시킬 수 있도록 직류방식 송전시스템에 적용시킬 수 있는 개선책은 무엇인가? PES의 에너지개발 및 발전위원회의 국제분과위원회 위원장인 토마스 J. 하몬스 씨(영국 스코틀랜드의 글래스고 대학)가 세션의 좌장을 맡았으며, 매니토바 하이드로(캐나다)의 데니스 우드포드씨가 모더레이터 역을 맡았다. 그리고 하몬스 씨와 우드포드 씨가 이 세션을 계획$\cdot$준비하였다. 이 문제에서 국제적인 시야를 가지는 패널리스트들은 HVDC 송전기술의 장래에 대한 전망을 가지는데 비하여 북아메리카에 국한된 시야를 가지는 패널리스트들은 HVDC 사용에 대한 장래의 잠재성을 낮게 보고 있는 것이 흥미로운 일이다.

• Journal of the Korean Chemical Society
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• v.14 no.4
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• pp.341-345
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• 1970

An improved derivative thermometric titration apparatus designed around operational amplifiers is described which is capable of monitoring the small temperature change and of computing the derivatives for accentuation of the titration end point that is difficult to locate by extrapolation methods. The instrument is constructed of four commercial operational amplifiers. A use of dummy cell provides the subtraction means for compensation of the initial temperature and random temperature fluctuations with a resultant gain in signal-to-noise ratio. The successive differentiation action of the computer has been nearly "perfect," so that the two breaks (blank or starting and end point of the titration curve can be located with the precision of 0.2% by observing two peak points on the second derivative curve. Arrangements useful in obtaining such a good derivative response that is exactly proportional to the input signal are discussed. Plots of the enthalphogram and its derivatives are presented, with the results of several titrations used to evaluate the performance of the apparatus.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2010.05a
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• pp.401-405
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• 2010

An efficient performance model for scramjet engines has been proposed for scramjet performance design. In supersonic air intake design, the compression angles of the wedge were determined to maximize the total pressure recovery of the intake based on Oswatisch criterion. Both combustion models of chemical equilibrium and finite-rate chemistry model are implemented, and compared each model with the results by Starkey for Waverider engine configuration. Finally, the performance model of concern has been confirmed by conducting performance analysis with hypothetical mission profile and design conditions.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2017.05a
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• pp.277-284
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• 2017

This study is the results of the analytical research for a dual-model scramjet engine flowpath which is included inlet, isolator, combustor, and nozzle. To design a dual-mode scramjet engine and to investigate its performance, the performance analysis models and tools are required to develope for aerodynamic, thermodynamic characteristics, propulsion, and total system. Therefore, analysis models for air inlet, isolator, supersonic combustor, and nozzle of a dual-mode scramjet engine were accomplished, the performance characteristics of a dual-mode scramjet engine is investigated with using the developed analysis tools.

• Korean Journal of Plant Resources
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• v.21 no.4
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• pp.310-323
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• 2008

This study was to establish the floristic composition of vascular plants of Mt. Hwangjang (1,077.3m). Floristic composition of vascular plants were conducted during April 2006${\sim}$August 2007. Vascular plants were composed of 97 families, 257 genera, 357 species, 5 subspecies, 42 varieties and 9 formae, totaling 413 taxa. Among the investigated resources plants, 6 taxa were Korean endemic species. The special plants based on floral region by Ministry of Environment (2006) were 55 taxa. A naturalized plants were 15 species, correspond to 5.2% of totaling 290 species (Kim and Lee, 2006) appeared in South Korea.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.27 no.3
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• pp.579-589
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• 2017

The cloud environment is hypervisor-based, and many virtual machines are interconnected, which makes propagation of malicious code easier than other environments. Accordingly, this paper proposes a malicious traffic dynamic analysis system for secure cloud environment. The proposed system continuously monitors and analyzes malicious activity in an isolated virtual network environment by distinguishing malicious traffic that occurs in a cloud environment. In addition, the analyzed results are reflected in the distinguishment and analysis of malicious traffic that occurs in the future. The goal of this research is secure and efficient malicious traffic dynamic analysis by constructing the malicious traffic analysis environment in the cloud environment for detecting and responding to the new and variant malicious traffic generated in the cloud environment.

• Proceedings of the KIEE Conference
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• 2006.07c
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• pp.1721-1722
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• 2006

Electro-magnetic launcher(EML)는 전자기력을 이용하여 발사체를 추진시키는 장치이다. EML은 크게 레일건의 형태와 코일건의 형태로 구분되며, 본 논문에서는 코일건의 형태로 설계, 제작하였다. 코일건의 형태인 EML은 솔레노이드에 여자되는 전류에 의해서 발사체에 흡인력이 발생하여 추진, 가속되므로 솔레노이드의 최적형태를 설계하고, 이를 바탕으로 제작하여 EML의 스위칭 시간에 따른 속도를 측정하여, 여자전류의 스위칭 시간에 따른 동작특성을 해석, 실험하여 분석하였다.