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New Concept for Rock Structure Monitoring by Light Emitting Sensors
Shinich AKUTAGAWA,Syoya MORI,Ayako KUSUI,Mitsugu NOMURA 한국암반공학회 2009 한국암반공학회 학술대회 및 세미나 자료집 Vol.2009 No.10
Use of the LEDS or laser beam could change the data flow of engineering monitoring in general. As shown in Figure 10, a general flow starts from a deformation detected by an instrument which is recorded usually on a PC. The recorded data are then processed by software and are visually checked by an engineer. As he or she judge safety based on the visualized information, a warning, if necessary, is issued for citizens. On the contrary, if LEDSs or laser pointers are installed on site, real-time visualization of deformation becomes possible at all times linking the reality to citizens directly. Early detection of minor structural deficiency enables better organized maintenance being performed lessening the probability of accidents and sustainable. Real-time monitoring of state of deformation of infrastructure by a new device such as LEDS or laser pointer make this possible.
Jae-Ho LEE,Shnichi AKUTAGAWA,Hong-Duk MOON,Heui-Soo HAN,Ji-Hyeung YOO,Kwang-Yeun Kim 한국암반공학회 2008 한국암반공학회 학술대회 및 세미나 자료집 Vol.- No.-
Currently an increasing number of urban tunnels with small overburden are excavated according to the principle of the New Austrian Tunneling Method (NATM). For rational management of tunnels from planning to construction and maintenance stages, prediction, control and monitoring of displacements of and around the tunnel have to be performed with high accuracy. Computational method tools, such as finite element method, have been and are indispensable tool for tunnel engineers for many years. It is, however, a commonly acknowledged fact that determination of input parameters, especially material properties exhibiting nonlinear stress-strain relationship, is not an easy task even for an experienced engineer. Use and application of the acquired tunnel information is important for prediction accuracy and improvement of tunnel behavior on construction. Artificial Neural Network (ANN) model is a form of artificial intelligence that attempts to mimic behavior of human brain and nervous system. The main objective of this paper is to perform the deformation analysis in NATM tunnel by means of numerical simulation and artificial neural network (ANN) with field database. Developed ANN model can achieve a high level of prediction accuracy.
Tunnel Pressure acting on Shallow Tunnel in Unconsolidated Ground
이재호(Jae-Ho Lee),아쿠타가와 신니치(Shinish Akutagawa),김영수(Young-Su Kim),문홍득(Hong-Duk Moon) 한국암반공학회 2007 터널과지하공간 Vol.17 No.6
Terzaghi터널조합 이론은 shield 및 도심 NATM터널의 설계토압으로 현재까지도 사용되고 있다. 본 논문에서 지반의 변형거동과 한계상태를 가정한 Terzaghi 토양과의 상호 관계에 관한 조사를 위해 Terzaghi 터널토압 이론, 2차원 실내 터널 모형 설험과 변형률 연화모델을 기본으로한 비선형 수치해석을 실시하였다. 굴착에 따른 터널 토압와 지반 변형거동의 폭넓은 이해와 그들의 상호작용에 대한 효율적인 활용은 경제적인 터널 지보설계와 안정한 시공을 이끌수 있다. Terzaghi's tunnel pressure theory is generally used to estimate primary design pressures on tunnel support for shield and urban NATM tunnels until now. A trial is made in this paper to investigate the interaction between the ground deformation behavior and Terzaghi's tunnel pressure, which assumes ground's limit (or critical) state, by considering results of Terzaghi's tunnel pressure theory, two-dimensional reduced-scale model tunnel tests and nonlinear numerical analysis based on strain softening modeling. A full understanding between tunnel pressure and ground deformation behavior under the tunnel excavation and an effective utilization of this interaction lead to an economical tunnel support design and a safe construction of tunnel.
Atmospheric Polycyclic and Nitropolycyclic Aromatic Hydrocarbons in an Iron-manufacturing City
Hayakawa, Kazuichi,Tang, Ning,Morisaki, Hiroshi,Toriba, Akira,Akutagawa, Tomoko,Sakai, Shigekatsu Korean Society for Atmospheric Environment 2016 Asian Journal of Atmospheric Environment (AJAE) Vol.10 No.2
Total suspended particulates (TSP) in the atmosphere were collected for 2 weeks during winter in Muroran, Hokkaido, Japan, a typical iron-manufacturing city. The concentrations of polycyclic aromatic hydrocarbons (PAHs) and nitropolycyclic aromatic hydrocarbons (NPAHs) in TSP were determined by high-performance liquid chromatography (HPLC) using fluorescence and chemiluminescence detectors, respectively. No relationship was observed between the atmospheric PAH and NPAH concentration, or the atmospheric PAH and TSP concentration. However, there was a tendency that the atmospheric PAH concentration was higher when the wind blew from the coke-oven plant. Furthermore, the concentration ratios of 1-nitropyrene to pyrene, which is a suitable indicator of the contribution made by automobiles and coal combustion systems to urban air particulates, were smaller in Muroran and the values were close to those observed in particulates from coal combustion systems. Therefore, these results show that the PAH and NPAH compositions for Muroran are characteristic of an iron-manufacturing city.
Atmospheric Polycyclic and Nitropolycyclic Aromatic Hydrocarbons in an Iron-manufacturing City
Kazuichi Hayakawa,Ning Tang,Hiroshi Morisaki,Akira Toriba,Tomoko Akutagawa,Shigekatsu Sakai 한국대기환경학회 2016 Asian Journal of Atmospheric Environment (AJAE) Vol.10 No.2
Total suspended particulates (TSP) in the atmosphere were collected for 2 weeks during winter in Muroran, Hokkaido, Japan, a typical iron-manufacturing city. The concentrations of polycyclic aromatic hydrocarbons (PAHs) and nitropolycyclic aromatic hydrocarbons (NPAHs) in TSP were determined by high-performance liquid chromatography (HPLC) using fluorescence and chemiluminescence detectors, respectively. No relationship was observed between the atmospheric PAH and NPAH concentration, or the atmospheric PAH and TSP concentration. However, there was a tendency that the atmospheric PAH concentration was higher when the wind blew from the coke-oven plant. Furthermore, the concentration ratios of 1-nitropyrene to pyrene, which is a suitable indicator of the contribution made by automobiles and coal combustion systems to urban air particulates, were smaller in Muroran and the values were close to those observed in particulates from coal combustion systems. Therefore, these results show that the PAH and NPAH compositions for Muroran are characteristic of an iron-manufacturing city.
지하구조물에 있어서 강아치 지보공의 비파괴 응력계측에 관한 기초적 연구
곽기봉(Ki-Bong Kwak),이재호(Jae-Ho Lee),아쿠타가와 신니치(Akutagawa Shinichi),김영수(Young-Su Kim),권외덕(Wea-Dock Kwon) 한국토목섬유학회 2009 한국토목섬유학회 학술발표회 Vol.2009 No.11
본 연구에서는 새로운 비파괴 응력계측수법으로 주목을 받고 있는 자기이방성센서 측정 장치를 이용하여 터널굴착에 따른 강아치 지보공의 응력거동을 분석해 보았다. 자기이방성센서 응력측정방법은 철 등의 강자성체의 자기특성이 변형에 의존하는 것을 이용하여 강재표면의 절대응력을 구하는 방법이다. 본 연구에서는 자기이방성 응력측정법에 의한 계측과 변위계측 결과를 이용하여 단층부근을 지나가는 지반과 지보구조물의 변형과 응력 거동의 특성을 규명해보았다.
Terakado Toshitsugu,Nakai Yasunobu,Ikeda Go,Tsukada Kazuaki,Hanai Sho,Akutagawa Kazuki,Igarashi Haruki,Konishi Takahiro,Shiigai Masanari,Uemura Kazuya 대한신경중재치료의학회 2020 Neurointervention Vol.15 No.2
We herein report a case of a ruptured vertebral artery dissecting aneurysm involving the origin of the posterior inferior cerebellar artery that was treated using the stent-jack technique. After parent artery occlusion of the distal vertebral artery, stenting of the posterior inferior cerebellar artery was performed. Further coiling was needed because distal vertebral artery recanalization occurred due to transformation of the coil mass. The stent-jack technique for a ruptured vertebral artery dissecting aneurysm involving the origin of the posterior inferior cerebellar artery is effective; however, careful attention to recanalization after stenting is needed due to transformation of the coil mass.