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      • Gravity Prospecting of Underground Palace of Ming Tombs, China

        Hao, Tianyao,Wang, Qianshen,Suh, Man-Cheol Korean Society of Earth and Exploration Geophysici 2000 지구물리 Vol.3 No.3

        Microgravimetry is a rising and important branch developed on the foundation of classical gravimetry. In this paper, methods, techniques and application of microgravimetry for underground Palace are introduced. Some survey curves show agreeable result compared with the theoretical calculation of models. It can be a useful method for looking for underground palace and catacombs. 미세중력 측정기는 최근 그 중요성이 부각되고 있는 분야로 전통적인 중력측정장치를 기초로 개발되었다. 이 논문에서는 지하 광전 탐사 작업을 위한 미세중력 측정기의 원리와 기술, 그리고 활용법을 소개한다. 몇몇 조사 곡선들은 모델들을 통한 이론적 계산치와 비교하여 볼 때 왜 만족스러운 결과들을 보여주고 있다. 이 방법들은 지하의 왕궁이나 묘지들을 탐사하는데 유용하게 사용될 수 있을 것이다.

      • KCI등재후보

        Research on the Regional Characteristics of the Style of Contemporary Chinese Kazuo Purple Clay Wares

        Xie Tianyao 동방문화대학원대학교 문화예술콘텐츠연구소 2021 문화와예술연구 Vol.18 No.-

        중국 랴오닝성 조양시 카좌지역은 자사문화가 농후하고 역사가 유구하며 풍부한 자사광물자원과 심원한 자사역사를 갖고있으며 북방 자사의 대표이기도 하다. 현지의 지역문화는 당대 자사기물의 조형에 중요한 영향을 주었으며 카좌지역의 자사공 예대사는 현지의 우수한 문화유물을 계승한 기초에서 자사기물의 조형면에서 이론과 실천상의 끊임없는 탐색을 하였다. 이것은 오랜 제작공예와 현대조형예술이 완벽하게 결합되여 카좌 지방특색을 띤 자사기물조형을 형성하였다. 비록 카좌자사산업의 발전은 비교적 늦었지만 그 자사산업의 기원은 일찍 홍산문화시기로 거슬러올라갈수 있다. 유구한 역사적배경으로 하여 카좌자사기물의 조형은 일정한 연구가치가 있다. 전체 문장은 주로 두개 방면으로 논술하였다. 제1 부분에서는 카좌지역의 각 시기 자사의 발전배경에 대해 간략하게 소개한다. 제2 부분은 카좌 현지 문화유물이 카좌자사 기물의 조 형에 준 영향을 주요내용으로 한다. 각 시기 당지의 문화유물 을 주요원소로 하여 당대의 카좌자사기물조형에서 응용한 과정을 분석하여 카좌지역의 대표성을 띤 자사기물조형을 형성하였다. 또한 문물의 역사와 조형 방면에 대해 개술하고 조형요소를 응용한 자사기물이 대표하는 의의와 존재가치에 대해 깊이 있는 분석을 진행하였다. 그리고 몽골족을 주체로 한 현지 민족문화가 카좌자사 기물조형에 준 영향을 분석하였으며 몽골족 특유의 옷고름 장식, 민족악기, 건축풍격 등 조형요소를 카좌 당대의 자사기물 조형에 응용하였다. 이는 카좌자사공예의 전시일뿐만아니라 몽골족의 민족특색을 전승하는 중요한 담체로서 자사공예와 민족문화가 완벽하게 융합되었다. The purple clay culture in Kazuo area, Chaoyang City, Liaoning Province, China is rich and has a long history. It has rich purple clay mineral resources and a profound purple clay history, and is the representative of northern purple clay. The local regional culture has an important influence on the style of contemporary purple clay wares. On the basis of inheriting the local excellent cultural relics, the master of Kazuo purple clay has made continuous explorations in theory and practice in the style of purple clay wares, which is the perfect combination of ancient production technology and modern plastic arts, and has formed the style of purple clay wares with local characteristics of Kazuo. Although the development of Kazuo purple clay industry is late, the origin of purple clay can be traced back to the Hongshan culture period. The long historical background makes the style of Kazuo purple clay wares have certain research value. The full text is mainly discussed in two aspects. The first part briefly introduces the development background of purple clay in different periods in Kazuo area. The second part focuses on the influence of the Kazuo local cultural relics on the style of the Kazuo purple clay wares, through the analysis of the application of the local cultural relics as the main element in the contemporary Kazuo purple clay wares style in various periods, so as to form a regional representative of Kazuo purple clay wares, summary its cultural relics in terms of history and style, as well as analyze the meaning and value of existence of the purple clay wares using style elements. It also analyzes the influence of the local ethnic culture with Mongolian as the main body on the style of Kazuo purple clay wares, and applies the modeling elements such as the unique clothing and belt decoration, national musical instruments, and architectural style of Mongolian to the style of Kazuo contemporary purple clay wares, which is not only a manifestation of Kazuo purple clay technology, but also an important carrier for the inheritance of Mongolian national characteristics, and achieves the perfect integration of purple clay technology and national culture.

      • KCI등재

        Power System Harmonic Estimation Based on Park Transform

        Ya Chen,Tianyao Ji,Mengshi Li,Qinghua Wu,Xuejian Wang 대한전기학회 2016 Journal of Electrical Engineering & Technology Vol.11 No.3

        This paper presents a novel method for power system harmonic estimation based on the Park transform. The proposed method firstly extends the signal to a group of three-phase signals in a-b-c coordinate. Then, a linear fitting based method is adopted to estimate the fundamental frequency. Afterwards, the Park transform is utilized to convert the three-phase signals from a-b-c coordinate to d-q- 0 coordinate. Finally, the amplitude and phase of a harmonic component of interest can be calculated using the d-axis and q-axis components obtained. Simulation studies have been conducted using matrix laboratory (MATLAB) and power system computer aided design/electromagnetic transients including direct current (PSCAD/EMTDC). Simulation studies in MATLAB have considered three scenarios, i.e., no-frequency-deviation scenario, frequency-deviation scenario and the scenario in the presence of inter-harminics. The results have demonstrated that the proposed method achieves very high accuracy in frequency, phase and amplitude estimation under noisy conditions, and suffers little influence of the inter-harmonics. Moreover, comparison studies have proved that the proposed method is superior to FFT and Interpolated FFT with the Hanning Window (IpFFTHW). Finally, a popular case in PSCAD/EMTDC has been employed to further verify the effectiveness of the proposed method.

      • SCIESCOPUSKCI등재

        Power System Harmonic Estimation Based on Park Transform

        Chen, Ya,Ji, Tianyao,Li, Mengshi,Wu, Qinghua,Wang, Xuejian The Korean Institute of Electrical Engineers 2016 Journal of Electrical Engineering & Technology Vol.11 No.3

        This paper presents a novel method for power system harmonic estimation based on the Park transform. The proposed method firstly extends the signal to a group of three-phase signals in a-b-c coordinate. Then, a linear fitting based method is adopted to estimate the fundamental frequency. Afterwards, the Park transform is utilized to convert the three-phase signals from a-b-c coordinate to d-q-0 coordinate. Finally, the amplitude and phase of a harmonic component of interest can be calculated using the d-axis and q-axis components obtained. Simulation studies have been conducted using matrix laboratory (MATLAB) and power system computer aided design/electromagnetic transients including direct current (PSCAD/EMTDC). Simulation studies in MATLAB have considered three scenarios, i.e., no-frequency-deviation scenario, frequency-deviation scenario and the scenario in the presence of inter-harminics. The results have demonstrated that the proposed method achieves very high accuracy in frequency, phase and amplitude estimation under noisy conditions, and suffers little influence of the inter-harmonics. Moreover, comparison studies have proved that the proposed method is superior to FFT and Interpolated FFT with the Hanning Window (IpFFTHW). Finally, a popular case in PSCAD/EMTDC has been employed to further verify the effectiveness of the proposed method.

      • KCI등재

        충남지역 초염기성 암체의 지구물리학적 연구 : 탄성파 속도 특성 Characteristics of Seismic Velocity

        서만철,우영균,송석환,Tianyao, Hao 한국지구과학회 2000 韓國地球科學會誌 Vol.21 No.3

        Compressional and shear wave velocities (Vp and Vs) and densities have been measured for serpentinite, amphibolite, amphibole and biotite schist, and gneiss from western part of Chungnam Province at room temperature. Ranges of the density are 2.6∼2.86g/㎤ for serpentinite, 2.25∼2.81g/㎤ for talc, and 2.74∼3.07g/㎤ for metamorphic rocks. Of these rocks, talc shows wider ranges than serpentinite and amphibolites due to its metamorphic process from serpentinite. Values of Vp and Vs are 5719∼6062m/s and 2898∼3351m/s for seipentinites, 4019∼5478m/s and 2241∼2976m/s for talc, 5375∼6372m/s and 3042∼3625m/s for amphibolite, 5290∼5499 m/s and 2968∼3137m/s for schist, and 4788m/s and 2804m/s for gneiss, respectively. Velocity of P wave increases 1.47 times faster than S wave with increase of density. The results of seismic velocity measurement show anisotropy, higher velocity across than along the schistocity of rocks, especially in metamorphic rocks. This fact indicates that there were regional metamorphism related with tectonic forces. Values of seismic velocity increase with increasing pressure from 20 ㎫ to 70 ㎫, especially in metamorphic rocks. Overall recalculated Vp and Vs values suggest that the serpentinite indicates for upper mantle in the respects of seismic characteristics, in spite of high degree of serpentinization. In addition, those of the amphibolite do for low crust, and gneiss and schist for upper crust.

      • Crustal structure of the Gunsan Basin in the SE Yellow Sea from ocean bottom seismometer (OBS) data and its linkage to the South China Block

        Kim, Han-Joon,Kim, Chung-Ho,Hao, Tianyao,Liu, Lihua,Kim, Kwang-Hee,Jun, Hyunggu,Jou, Hyeong-Tae,Moon, Sunghoon,Xu, Ya,Wu, Zhiqiang,Lu, Chuanchuan,Lee, Sang Hoon Elsevier 2019 Journal of Asian earth sciences Vol.180 No.-

        <P><B>Abstract</B></P> <P>Two major tectonic units in NE Asia are the Sino-Korean (or North China) and South China Blocks that collided in the Permo-Triassic periods. The South China Block is suggested to extend eastward to the Korean Peninsula across the southern Yellow Sea. The Gunsan Basin is a well-defined, fault-bounded sedimentary basin in the SE Yellow Sea and is regarded as a structural link of the South China Block to the Korean Peninsula. We collected deep seismic sounding data recorded on ocean bottom seismometers to investigate how the crustal structure and nature of the South China Block vary in the Gunsan Basin toward the middle part of the Korean Peninsula. The main part of the Gunsan Basin is underlain by relatively thin (∼10 km thick) upper and much thicker (∼20 km thick) lower crustal layers, indicating a close affinity to the South China Block; whereas it shows distinction from the Korean Peninsula underlain by upper and lower crustal layers with equal (∼15 km) thickness. A change in crustal structure is recognized under the eastern margin of the Gunsan Basin toward the Korean Peninsula, that features a transition to the Korean Peninsula. The thick lower crustal layer in the Gunsan Basin appears to be inherited from the evolution of the South China Block including crustal shortening associated with the assembly of Rodinia in the Neoproterozoic before the collision between the Sino-Korean and South China Blocks.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We image how the crustal stucture nature vary in the SE Yellow Sea. </LI> <LI> The Gunsan Basin is underlain by relatively thin upper and much thick lower crustal layers. </LI> <LI> A transition in crustal structure is recognized from the South China Block to the Korean Peninsula. </LI> <LI> The crustal structure is inherited from the growth of Rodinia. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

      • KCI등재

        Seafloor terrain detection from acoustic images utilizing the fast two-dimensional CMLD-CFAR

        Wang Jiaqi,Li Haisen,Do Weidong,Xing Tianyao,Zhou Tian 대한조선학회 2021 International Journal of Naval Architecture and Oc Vol.13 No.1

        In order to solve the problem of false terrains caused by environmental interferences and tunneling effect in the conventional multi-beam seafloor terrain detection, this paper proposed a seafloor topography detection method based on fast two-dimensional (2D) Censored Mean Level Detector-statistics Constant False Alarm Rate (CMLD-CFAR) method. The proposed method uses s cross-sliding window. The target occlusion phenomenon that occurs in multi-target environments can be eliminated by censoring some of the large cells of the reference cells, while the remaining reference cells are used to calculate the local threshold. The conventional 2D CMLD-CFAR methods need to estimate the background clutter power level for every pixel, thus increasing the computational burden significantly. In order to overcome this limitation, the proposed method uses a fast algorithm to select the Regions of Interest (ROI) based on a global threshold, while the rest pixels are distinguished as clutter directly. The proposed method is verified by experiments with real multi-beam data. The results show that the proposed method can effectively solve the problem of false terrain in a multi-beam terrain survey and achieve a high detection accuracy.

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