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김창석,이우선,정천옥,김병인 조선대학교 에너지.자원신기술연구소 2001 에너지·자원신기술연구소 논문지 Vol.23 No.2
In these days, the thinner film of dielectric materials is required while it's capacitance is required to be still large at the VLSI process. Most of such VLSI have MOS structures. For the research on this requirement, MOS capacitors were fabricated on the silicon wafer in four different thickness groups by RF sputtering method. SiO of the SiO/TiN film is used as the insulating layer and TIN is chosen as the barrier against the diffusion of Al which is the terminal connected by ohmic contact because TIN has the advantageous properties such as good thermal stability and very low diffusion rate in spite of it's relatively low specific resistance. In this study their electrical and optical characteristics are investigated to find refractive index, absorption coefficient and Permittivity.
김창석,김정연 한국지역개발학회 2000 韓國地域開發學會誌 Vol.12 No.2
The purpose of this paper is to find out the functional characteristics of 175 small towns and cities in Chungnam province. The unit of analysis is the built-up area of the seat of local administrative office such as the 6 cities(urban Dong), 23 towns(Eup), and 147 townships(Myon). Univariate and multivariate analyses(that is, factor and cluster analysis) were conducted for the classification of urban functions. Significant differences exist among the seats of local administrative office of cities, Eups, and Myons in respective variables, but many extreme values are found among the seats of Myon office. The results of multivariate analysis show that the seats of local administrative offices can be classified into four categories: (1) Chunan city at the top which surpasses the others in terms of size, variety of urban function, and vitality: (2) the other cities and Eups which function as rural service centers. Eups that belong to this category can be divided into two sub-types according to the strength of functions: and (3) the seats of Myons which can be classified into 4 types depending on their dominant functions: that is, rural service center, newly industrializing area, basic administration center maintained by public facilities, and the others with insufficient urban functions. Based on these results of analyses, this paper suggests as follows: the promotion policies for small towns and cities should be applied selectively according to their significance in the regional urban system: the respective small towns and cities should be specialized functionally if possible: and cooperative networks should be established among these for getting economies of scale by network efficiency.
김창석,김진원,오영주,홍선희,허수정,이채영,박기웅,조승현,권오도,임일빈,김상국,성덕경,정영재,이정란,이인용 한국잔디학회 2018 Weed & Turfgrass Science Vol.7 No.1
We surveyed the distribution of exotic weeds in Korean paddy fields, uplands, orchards and pastures from 12,568 sites during 3 years, 2013, 2014 and 2015. As a result, 166 species in 28 families were identified and 7, 130, 126, and 80 species were surveyed from paddy fields, uplands, orchards, and pastures, respectively. Among the 166 species, 128 species were annual weed and 38 species were perennial weed. Especially, winter annual exotic weeds were 63 species (37.8%). 46, 16, and 104 exotic weeds were classified to their introduction period of 1st (1876-1921), 2nd (1922-1963), and 3rd (1964-now) period, respectively. The exotic weeds introduced in 2nd and 3rd period, included 12 Invasive Alien Species. The weeds from 1st period, however, could be grouped into native weeds as the ‘naturalized weed’ and managed the same as the native weeds. Especially, some exotic weeds such as common groundsel were widely distributed in Korean crop lands, and they will become more problematic in near future. Therefore, systemic research from the biology to management should be conducted and the results from the studies should be applied practically. 우리나라 논, 밭, 과수원 및 목초지에 발생하는 외래잡초를 전국 9개도 12,568지점에서 2013년부터 2015년까지조사하였다. 논에서는 4과 7종, 밭에서는 24과 130종, 과수원에서는 24과 126종, 목초지는 23과 82종이 조사되었고, 총 28과 166종이 발생하고 있었다. 생활형으로 보면, 일년생은 128종, 다년생 38종이었으며, 동계잡초가 37.9%로, 외래잡초 중 동계잡초의 비율이 상대적으로 높음을 확인할 수 있었다. 유입시기별로 분석한 결과, 1기(1876-1921) 에 46종, 2기(1922-1963)에는 16종, 3기(1964-2015)에는 104종이었다. 2기 및 3기 외래잡초의 경우, 생태계교란종도포함하고 있었으며, 이에 대한 방제 연구가 필요할 것으로 사료된다. 그러나 1기 외래잡초는 귀화잡초로 분류하고, 자생잡초와 같이 분류하는 것이 농경지 잡초관리 계획 수립에 효율적일 것이다. 특히 개쑥갓 등과 같은 외래잡초로 인한 작물의 피해가 점차 증가할 것으로 예상된다. 따라서 각 초종에 대해 생리 ․ 생태와 같은 기초연구부터 방제연구까지 체계적인 연구와 이의 활용이 필요할 것이다.
김창석 한국고대사학회 2001 韓國古代史硏究 Vol.21 No.-
The 'Silla Village Register' was made according to the following procedures, The village head (村主) reports the collected basic materials, which mainly consisted of the census registration of each respective houses or families, Then, the pertinent hyon (縣-prefecture), so-kyung (小京-small capital or local administrative centres), and kun(郡-county or district) will synthesize such materials and they, in turn, will report them to ju(州- province) in a designated year. The province will examine the prepared documents and compare them with the precedent ones, followed by a field survey, In the end, the province arranges a new 'total document' for each village, in the coherent format like the 'Silla village register', Therefore, the 'Silla village register' is currently estimated to be a copy which supplemented the 'village total document', made in the province of ungchun(熊川州). Just like the central governmental office of the capital has supplied its own finance by receiving the operating expense through changbu (倉部-storage section) and jobu (調俯-taxation department), the local administration also seemed to have financed itself by obtaining the allotments of taxation which were gathered in local warehouses, Also some local administrations, in particular, have had managed to complement the expense with a certain portion of the taxation from a few villages that they received when given special tasks, The village shown in the 'Silla village register' has indicated signs of breeding state-distributed horses and cows. Regional administrative units above the level of hyon have had carried out the regular survey on the villages under their supervision. The highest local administration of ju must have had prepared this kind of document for all villages that it governed. Among those villages were included ones only subjected to general taxation of the state, specially designated for the financial gains of the regional government office, and those instituted from an official's stipend-town(祿邑).
김창석,정천옥,김병인 조선대학교 에너지.자원신기술연구소 1999 에너지·자원신기술연구소 논문지 Vol.21 No.2
This paper evaporates PbTiO_(3) layer thickness differently with RF sputtering method on Si Wafer(n-100). This study is performed to examine the characteristics of electric constant, photon energy and dielectric loss according to the thickness of PbTiO_(3) and increase the reliability and reproduction of PbTiO_(3) thin film. It is confirmed that the variation of electric constant by frequency resulted from the formation of particles within thin film, the particle size and the polarization on grain boundary. In conclusion dielectric loss depends on the value of imaginary number (ε_(2)), polarizability falls zero(0) by resonance absorption and is close to 0 of tanδ value and Q value of dielectric loss.
An Educational Service Platform using Collective Intelligence and Presence of Web 2.0
김창석,조정호,손동철 한국지능시스템학회 2009 한국지능시스템학회논문지 Vol.19 No.1
Web 2.0 has become the face next generation Web among the business world and research community. Web 2.0 is instant superficial gratification of people. On the other hand, Semantic Web is deep, meaningful and lasting relationship with data. So, it is difficult to apply the Semantic Web to the real world. In this paper, a platform for educational services using the SEMANTIC Web and Web 2.0 is proposed. The proposed platform is based mix of the Semantic Web and Web 2.0, so it is useful to apply in the real world applications. Two services are presened, one is a semantic email system and the other is a cyber study space. The cyber study space adjusted each student is presented. The study environment is called iStudySpace that has personal scheduler, study status plan table, personalized search engine and several gadgets. Finally characteristics and limitations of the Semantic Web and Web 2.0, the organization and components of the platform, evaluation of iStudySpace are shown.
김창석,황석영,서진연,정삼용 조선대학교 동력자원연구소 1995 動力資源硏究所誌 Vol.17 No.1
This paper describes the proper selection method of the power system stabilizer(PSS) parameter for stabilizing operation of a synchronous machine which connected to infinite bus by using pole assignment method. The purpose of PSS is to enhance the damping capability at small frequency oscillation (0.5∼2㎐). It can be achieved by moving the real part of critical eigenvalue (pole) on left side of s-plane. The PSS parameter was selected by using the proposed method to match with a pre-assigned pole associated with poorly damped swing mode. This method has been studied to synthesize the PSS on Yong-Gwang N/P. And the simulation results show that the selected parameter by using proposed method is effective for dynamic and transient stability of power system.