• The Bulletin of The Korean Astronomical Society
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• v.37 no.2
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• pp.78.1-78.1
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• 2012

We have studied the physical properties of X-ray point sources in galaxy clusters using ~600 Chandra archival observations. The goal of this study is to investigate the density environmental effects on the physical properties of X-ray point sources by comparing the properties of X-ray point sources in galaxy clusters to those in typical blank fields. In this presentation, we show the nature of X-ray point sources which are expected to be related with galaxy clusters with different core properties. Using ~60 galaxy clusters observed with Chandra, we investigate the physical properties of X-ray point sources in cool-core and non-cool-core clusters. The cool-core clusters are known to have short central cooling time, and are characterized by low central entropy, systematic central temperature drops, and a brightest cluster galaxy at the X-ray peak. While the non-cool-core clusters have longer central cooling time, and are characterized by large central entropies and flat or centrally rising temperature profile. We show that how central core properties of galaxy clusters affect on the physical properties of X-ray point sources.

• Journal of Acupuncture Research
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• v.24 no.5
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• pp.89-96
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• 2007

Objectives : This report is to compare Remote Acupuncture Point Needling group with Trigger Point Needling group about Shoulder pain treatment. Methods : From November 11th 2006 to May 10th 2007, 30 cases of shoulder pain patients were divided into 2 groups ; one group(test I group) took remote acupuncture point needling, and the other group(test II group) took trigger point needling. For evaluating change of pain, Visual Analog Scale(VAS) and clinical evaluation grade and Range of Motion was checked before and after Treatment. Results : Both acupuncture therapy showed good effect on shoulder pain. And test II group showed better effect on decreasing pain than test I group. It was proved by the difference between VAS and ROM checked before treatment and what checked after treatment. But it was only significant statistically for adduction, inversion and eversion of shoulder joint motion. Conclusion : Trigger point needling can be recommended as a useful therapy to treat shoulder pain.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.46 no.2
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• pp.15-23
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• 2009

This paper presents a novel high-speed, low-complexity flexible 128/64-point $radix-2^4$ FFT/IFFT processor for the applications in high-throughput MIMO-OFDM systems. The high radix multi-path delay feed-back (MDF) FFT architecture provides a higher throughput rate and low hardware complexity by using a four-parallel data-path scheme. The proposed processor not only supports the operation of FFT/IFFT in 128-point and 64-point but can also provide a high data processing rate by using a four-parallel data-path scheme. Furthermore, the proposed design has a less hardware complexity compared with traditional 128/64-point FFT/IFFT processors. Our proposed processor has a high throughput rate of up to 560Msample/s at 140MHz while requiring much smaller hardware expenditure satisfying IEEE 802.11n standard requirements.

• Journal of Positioning, Navigation, and Timing
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• v.2 no.1
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• pp.81-89
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• 2013

Many of the current visual odometry algorithms suffer from some extreme limitations such as requiring a high amount of computation time, complex algorithms, and not working in urban environments. In this paper, we present an approach that can solve all the above problems using a single camera. Using a planar motion assumption and Ackermann's principle of motion, we construct the vehicle's motion model as a circular planar motion (2DOF). Then, we adopt a 1-point method to improve the Ransac algorithm and the relative motion estimation. In the Ransac algorithm, we use a 1-point method to generate the hypothesis and then adopt the Levenberg-Marquardt method to minimize the geometric error function and verify inliers. In motion estimation, we combine the 1-point method with a simple least-square minimization solution to handle cases in which only a few feature points are present. The 1-point method is the key to speed up our visual odometry application to real-time systems. Finally, a Bundle Adjustment algorithm is adopted to refine the pose estimation. The results on real datasets in urban dynamic environments demonstrate the effectiveness of our proposed algorithm.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.46 no.1
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• pp.95-103
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• 2009

We improve the performance of WCDMA repeater by cancelling the feedback interference radio signal under the fixed point implementation. Floating-point DSP or FPGA to implement the ICS algorithm may have an disadvantage of high cost, To solve this problem, we suggest the ICS algorithm based on LMS under fixed point operation, and show the validity of our results by comparing with the floating-point results through numerical simulation.

• The Journal of Internal Korean Medicine
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• v.37 no.3
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• pp.508-515
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• 2016

Objective: The purpose of the study was to examine the effects of a five-week auricular acupressure (AA) program on smoking cessation for male high school students.Methods: From May 27 2015 to November 18 2015, this study investigated 66 high school students who had been smoking. More than four sessions of AA were given to participants, and surveys were conducted before each treatment. Once a week, the AA was administered at the endocrine point, lung point, throat point, nasal fossae point, bronchial tube point, and mouth point.Result: Thirty-four (51.5%) students reduced their number of cigarettes smoked per day, while 17 (25.7%) students complained of side effects.Conclusions: Results show that AA is generally effective, and side effects occur less often than with anti-smoking acupuncture. So AA could be preferred on smoking cessation for students.

• Korean Journal of Ecology and Environment
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• v.38 no.spc
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• pp.67-75
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• 2005

The objectives of this study were to understand the runoff characteristics of the non-point sources originating from impervious surfaces and to assess their effect on the aquatic environment in the urban areas. The concentration of pollutants (SS, BOD, COD and T-P) except for T-N showed the highest value in runoff from road, and event mean concentration (EMC) also showed high value from road. The pollutants discharged from road showed a higher concentration in the beginning stage (0 ${\sim}$ 30%) of progressive percentage of rainfall. The contribution percentages of non-point sources by load were 44.9% for SS, 11.2% for BOD, 21.4% for COD, 11.4% for T-N and 8.1% for T-P in the total load of pollutant discharged through sewer. From our results, the road was a significant potential source that deteriorated water quality of the streams and lakes in the vicinity of the urban area during the rain period. Therefore, counter plan is required to reduce pollutant concentration on the road from non-point sources in the urban area. Also, since pollutant concentration in the beginning stage of rainfall was quite high, road cleaning seems to be one of the very useful methods to prevent inflowing of pollutants to the aquatic environment.

• Journal of Acupuncture Research
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• v.30 no.1
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• pp.13-22
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• 2013

Objectives : The aim of this study was to show the application to add the Dong-Qi therapy of the Dong-Si acupuncture to exercise therapy of the movement system impairment syndrome(MSIS) and to determine the best acupuncture point for the Dong-Qi therapy. Methods : We reviewed Diagnosis and Treatment of Movement Impairment Syndrome and Movement System Impairment Syndromes Of The Extremities, Cervical and Thoracic Spines written by Sahrmann SA. to show the exercise therapy of the sort of MSIS. We reviewed complete works of Yang Wei Jie to show the acupuncture points of the Dong-Si acupuncture and the Dong-Qi therapy. Results : We showed the acupuncture point of the Dong-Si acupuncture by each type of MSIS based on the reference book of MSIS, the Dong-Si acupuncture. Also, we selected and tabulated the best possible acupuncture point of the Dong-Si acupuncture which could minimize a side effect of acupuncture during the therapeutic exercise by each type of MSIS. Conclusion : A specific acupuncture point of the Dong-Si acupuncture could be chosen for a specific MSIS therapeutic exercise. The best possible acupuncture point could be chosen when selecting an acupuncture point of the Dong-Si acupuncture.

• Journal of Electrical Engineering and Technology
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• v.13 no.2
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• pp.752-760
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• 2018

In this paper, interior permanent magnet synchronous motor (IPMSM) design for sensorless drive, considering magnetic neutral point shift according to magnetic saturation, has been proposed. Sensorless control was divided into a method based on inductance and a method based on back induced voltage. Because induced voltage is very small at zero or low speed, error in rotor initial position estimation may occur. Using the ratio of saliency addresses this problem. When using high-frequency injections at low speed, the rotor's initial position is estimated at the smallest portion of the inductance. IPMSM has the minimum inductance at the d-axis. However, if magnetic saturation leads to magnetic neutral point variation, following the load current change, there is a change in the minimum point of inductance. In this case, it can lead to failure of initial rotor position estimation. As a result, it is essential that the blocking design has an inductance minimum point shift. As such, in this study, an IPMSM design method, by blocking magnetic neutral point change, has been proposed. After determining the inductance profile based on the finite element analysis (FEA), the results of proposed method were verified.

• Journal of applied mathematics & informatics
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• v.28 no.5_6
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• pp.1171-1184
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• 2010

In this paper, by using fixed point theorems in cones, the existence of positive solutions is considered for nonlinear m-point boundary value problem for the following second-order dynamic equations on time scales $({\phi}(u^{\Delta}))^{\nabla}+a(t)f(t,\;u(t))=0$, t $\in$ (0, T), $u(0)=\sum\limits^{m-2}_{i=1}a_iu(\xi_i)$, $\phi(u^{\Delta}(T))=\sum\limits^{m-2}_{i=1}b_i{\phi}(u^{\Delta}(\xi_i))$, where $\phi$ : R $\rightarrow$ R is an increasing homeomorphism and positive homomorphism and ${\phi}(0)=0$. In [27], we obtained the existence results of the above problem for an increasing homeomorphism and positive homomorphism with sign changing nonlinearity. The purpose of this paper is to supplement with a result in the case when the nonlinear term f is nonnegative, and the most point we must point out for readers is that there is only the p-Laplacian case for increasing homeomorphism and positive homomorphism due to the sign restriction. As an application, one example to demonstrate our results are given.