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최재욱(Choi, Jaewook),정은빈(Jeong, Eunbeen),박성표(Park, Sungpyo),김태완(Kim, Tae-Wan),이찬식(Lee, Chansik) 대한건축학회 2019 대한건축학회 학술발표대회 논문집 Vol.39 No.2
As apartments built to address overcrowding in the Seoul metropolitan area have become dilapidated, the housing performance has been reduced and the shortage of parking lots has become more serious. Parking lots can be secured by remodeling, but there are not enough cases. The study aims to develop WBS for expansion of underground parking lots, drawing detailed work to calculate construction costs. The derived WBSs were applied to the case complex and analyzed. As a result, 12 activities were derived for Alternative 1(extended after its existence) and 24 activities for Alternative 2(extended after demolition).
Positioning using ZigBee and Ultrasound
Chansik Park,Seung Beom Kim,Dong-Youn Kang,Hee Hak Yun,En Jong Cha,Sang Jeong Lee 한국항해항만학회 2006 한국항해항만학회 학술대회논문집 Vol.2 No.-
To find a location, GPS has been wildly used. But, it is hard to use in indoor because of very weak signal level. To meet indoor requirements, there have been many studies applying wireless communication networks such as WLAN, UWB and ZigBee. Among these, ZigBee is widely adopted in many WSN applications because it has an advantage of low-power and low-cost. In ZigBee, the RSSI is used as range measurement for ad-hoc network. The RSSI are converted to ranges using the signal attenuation model and these ranges become inputs of positioning methods. The obtained position with RSSI has large error because of its poor accuracy. To overcome this problem, ultrasonic sensors are added in many researches. By measuring the arrival time difference of ZigBee and ultrasound as a range measurement, the precise position can be found. However, there are still many problems: scheduling of beacons to transmit signals in a correct order, addition and synchronization of beacons and low-rate positioning rate. At this paper, an efficient method to solve these problems is proposed. In the proposed method, a node transmits ZigBee and ultrasound signal simultaneously. And beacons find the range with the received signals and send it back to a node with ZigBee. The position is computed in a node with the received ranges. In addition, a new positioning algorithm to solve the risk of the divergence in the linearization method and the singularity problem in the Savarese method is presented. Both static and dynamic experimental results show 0.02m RMS errors with high output rate.
Park, Sang Eun,Song, Ji Hoon,Hong, Chansik,Kim, Dong Eun,Sul, Jee-Won,Kim, Tae-Youn,Seo, Bo-Ra,So, Insuk,Kim, Sang-Yeob,Bae, Dong-Jun,Park, Mi-Ha,Lim, Hye Min,Baek, In-Jeoung,Riccio, Antonio,Lee, Joo- Springer US 2019 Molecular Neurobiology Vol.56 No.4
<P>Oxidative stress is a key mediator of neuronal death in acute brain injuries, such as epilepsy, trauma, and stroke. Although it is accompanied by diverse cellular changes, increases in levels of intracellular zinc ion (Zn<SUP>2+</SUP>) and calcium ion (Ca<SUP>2+</SUP>) may play a critical causative role in oxidative neuronal death. However, the mechanistic link between Zn<SUP>2+</SUP> and Ca<SUP>2+</SUP> dyshomeostasis in neurons during oxidative stress is not well-understood. Here, we show that the exposure of cortical neurons to H<SUB>2</SUB>O<SUB>2</SUB> led to a zinc-triggered calcium influx, which resulted in neuronal death. The cyclin-dependent kinase inhibitor, NU6027, inhibited H<SUB>2</SUB>O<SUB>2</SUB>-induced Ca<SUP>2+</SUP> increases and subsequent cell death in cortical neurons, without affecting the early increase in Zn<SUP>2+</SUP>. Therefore, we attempted to identify the zinc-regulated Ca<SUP>2+</SUP> pathway that was inhibited by NU6027. The expression profile in cortical neurons identified transient receptor potential cation channel 5 (TRPC5) as a candidate that is known to involve in the generation of epileptiform burst firing and epileptic neuronal death (Phelan KD et al. 2012a; Phelan KD et al. 2013b). NU6027 inhibited basal and zinc-augmented TRPC5 currents in TRPC5-overexpressing HEK293 cells. Consistently, cortical neurons from TRPC5 knockout mice were highly resistant to H<SUB>2</SUB>O<SUB>2</SUB>-induced death. Moreover, NU6027 is neuroprotective in kainate-treated epileptic rats. Our results demonstrate that TRPC5 is a novel therapeutic target against oxidative neuronal injury in prolonged seizures and that NU6027 is a potent inhibitor of TRPC5.</P><P><B>Electronic supplementary material</B></P><P>The online version of this article (10.1007/s12035-018-1258-7) contains supplementary material, which is available to authorized users.</P>
A Design and Implementation of Software Defined Radio for Rapid Prototyping of GNSS Receiver
Park, Kwi Woo,Yang, Jin-Mo,Park, Chansik The Institute of Positioning 2018 Journal of Positioning, Navigation, and Timing Vol.7 No.4
In this paper, a Software Defined Radio (SDR) architecture was designed and implemented for rapid prototyping of GNSS receiver. The proposed SDR can receive various GNSS and direct sequence spread spectrum (DSSS) signals without software modification by expanded input parameters containing information of the desired signal. Input parameters include code information, center frequency, message format, etc. To receive various signal by parameter controlling, a correlator, a data bit extractor and a receiver channel were designed considering the expanded input parameters. In navigation signal processing, pseudorange was measured based on Coordinated Universal Time (UTC) and appropriate navigation message decoder was selected by message format of input parameter so that receiver position can be calculated even if SDR is set up various GNSS combination. To validate the proposed SDR, the software was implemented using C++, CUDA C based on GPU and USRP. Experimentation has confirmed that changing the input parameters allows GPS, GLONASS, and BDS satellite signals to be received. The precision of the position from implemented SDR were measured below 5 m (Circular Error Probability; CEP) for all scenarios. This means that the implemented SDR operated normally. The implemented SDR will be used in a variety of fields by allowing prototyping of various GNSS signal only by changing input parameters.
Park, Sul Gee,Cho, Deuk Jae,Park, Chansik The Institute of Positioning 2012 Journal of Positioning, Navigation, and Timing Vol.1 No.1
Due to inaccurate safe navigation estimates, maritime accidents have been occurring consistently. In order to solve this, the precise positioning technology using carrier phase information is used, but due to high buildings near inland waterways or inclination, satellite signals might become weak or blocked for some time. Under this weak signal environment for some time, the GPS raw measurements become less accurate so that it is difficult to search and maintain the integer ambiguity of carrier phase. In this paper, a method to generate code and carrier phase measurements under this environment and maintain resilient navigation is proposed. In the weak signal environment, the position of the receiver is estimated using an inertial sensor, and with this information, the distance between the satellite and the receiver is calculated to generate code measurements using IGS product and model. And, the carrier phase measurements are generated based on the statistics for generating fractional phase. In order to verify the performance of the proposed method, the proposed method was compared for a fixed blocked time. It was confirmed that in case of a weak or blocked satellite signals for 1 to 5 minutes, the proposed method showed more improved results than the inertial navigation only, maintaining stable positioning accuracy within 1 m.
Error Analysis of 3-Dimensional GPS Attitude Determination System
Chansik Park,Deuk Jae Cho,Eun Jong Cha,Dong-Hwan Hwang,Sang-Jeong Lee 대한전기학회 2006 International Journal of Control, Automation, and Vol.4 No.4
In this paper, the error investigation of a 3-dimensional GPS attitude determination system using the error covariance analysis is given. New efficient formulas for computing the Euler Angle Dilution of Precision (EADOP) are also derived. The formulas are easy to compute and represent the attitude error as a function of the nominal attitude of a vehicle, the baseline configuration and the receiver noise. Using the formula, the accuracy of the Euler angle can be analytically predicted without the use of computer simulations. Applications to some configurations reveal the effectiveness of the proposed method.
Implementation of Vehicle Navigation System using GNSS, INS, Odometer and Barometer
Park, Jungi,Lee, DongSun,Park, Chansik The Institute of Positioning 2015 Journal of Positioning, Navigation, and Timing Vol.4 No.3
In this study, a Global Navigation Satellite System (GNSS) / Inertial Navigation System (INS) / odometer / barometer integrated navigation system that uses a commercial navigation device including Micro Electro Mechanical Systems (MEMS) accelerometer and gyroscope in addition to GNSS, odometer information obtained from a vehicle, and a separate MEMS barometer sensor was implemented, and the performance was verified. In the case of GNSS and GNSS/INS integrated navigation system that are generally used in a navigation device, the performance would deteriorate in areas where GNSS signals are not available. Therefore, an integrated navigation system that calculates a better navigation solution in areas where GNSS signals are not available compared to general GNSS/INS by correcting the velocity error of GNSS/INS using an odometer and by correcting the cumulative altitude error of GNSS/INS using a barometer was suggested. To verify the performance of the navigation system, a commercial navigation device (Softman, Hyundai Mnsoft, http://www.hyundai-mnsoft.com) and a barometer sensor (ST Company) were installed at a vehicle, and an actual driving test was performed. To examine the performance of the algorithm, the navigation solutions of general GNSS/INS and the GNSS/INS/odometer/barometer integrated navigation system were compared in an area where GNSS signals are not available. As a result, a navigation solution that has a smaller position error than that of GNSS/INS could be obtained in the area where GNSS signals are not available.