• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.13 no.3
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• pp.64-72
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• 1999

The fictitious power theory in time domain is very easy to understand, but power analyzing speed of active power is increased, because power is analyzed using signal tedmiques based on the corre1ation between voltage and current wavefonns. Also, conventional methods in time/frequency domain to evaluate the correlation performance of active power filters are not provided easy solutions. So, the authors have previously proposed 3-D current coordinates which is composed into active component, fundarrental reactive component and distorted component of nonlinear loads current. This trethod has excellent perfonnance, but can not evaluate the characteristics of nonlinear load current whether It is inductive or capacitive. Therefore, To overcorre problems trentioned previously, this paper deals with the simple average power theory and the modified 3-D current coordinates for evaluating the compensation perfonnance of active power filters. To confirm the validity, active power filter simulator is developed using C-language. From the simulation, results are discussed their utility.tility.

• The Transactions of the Korean Institute of Power Electronics
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• v.8 no.3
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• pp.292-298
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• 2003

Most of the three phase inverters for adjustable speed drive of AC machines are equipped with two or three current sensors for measurement of three phase current. One method to reduce the number of current sensors is that single current sensor measures the DC link current, then three phase current is reconstructed using the measured value and the switching status. To improve the measurement accuracy, switching state should be maintained for more than minimum switching time. Many papers have been published, which focused on the readjustment of pulse width and compensation of voltage distortion. Those methods are suitable for space vector modulation. But there are some difficulties in applying these methods to carrier-based PWM which is widely used in industry. In this paper, new current measurement method and voltage compensation method are proposed which are suitable for carrier-based PWM, then, the validity of proposed method is confirmed through experiment.

• The Journal of the Acoustical Society of Korea
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• v.43 no.1
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• pp.72-77
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• 2024

Recently, the necessity for sound source localization has grown significantly across various industrial sectors. Among the sound source localization methods, sound intensimetry has the advantage of having high accuracy even with a small microphone array. However, the increase in localization error at high Helmholtz numbers have been pointed out as a limitation of this method. The study proposes a method to compensate for the bias error of the measured sound intensity vector according to the Helmholtz numbers by applying deep learning. The method makes it possible to estimate the accurate direction of arrival of the source by applying a dense layer-based deep learning model that derives compensated sound intensity vectors when inputting the sound intensity vectors measured by a tetrahedral microphone array for the Helmholtz numbers. The model is verified based on simulation data for all sound source directions with 0.1 < kd < 3.0. One can find that the deep learning-based approach expands the measurement frequency range when implementing the sound intensimetry-based sound source localization method, also one can make it applicable to various microphone array sizes.

• The Korean Journal of Air & Space Law and Policy
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• v.5
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• pp.265-301
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• 1993

지난 6월 3일 동경에서 있었던, 아시아 항공/우주법 학술대회 제 3분과에서 영국 Bin Cheng교수의 "The Warsaw System: Mess up, Tear up, or Shore up?"이라는 주제의 논문발표가 있었다. Bin Cheng교수는 특히 유럽의 EC Consultant Paper 와 일본항공사들의 1992년의 무한책임보상주의 채택에 대하여, 마치 무한 책임보상주의의 이론이 승리하였으며, 위의 상황들이 그 시작이라고 단정하였는데 이러한 견해는 아직까지 시기상조라고 생각한다. 본 글에서는 동경회의에서의 Bin Cheng교수의 논문중 특히 10항의 결론 부분을 중점으로 반대되는 의견을 제시하고자 한다. 국제항공사법인 와르소체제가 과연 발전하고 있는 것인가? 퇴보하고 있는 것인가? 와르소체제의 반대론자들은 미국의 소송변호사들, 일본항공사들과 일부 순수이론을 고수하는 학자들로써 이들은 와르소체제로부터의 탈퇴와 무한책임보상주의를 고수하고 있다. EC Consultation Paper (각주 122 참조)에서 보듯이, 비록 항공운송시의 손해배상액이 타 운송시의 손해배상액보다 적기는 하지만 이것이 곧 '무한책임보상주의'를 의미하는 것은 아니다. 미국의 판례중 불법행위로 인한 소송 (Nichole Fortman v. Hemeo Inc.)에서 보면, 작은 창자의 대부분을 병원의 과실때문에 잃은 Brooklin의 한 여인에게 500억 정도의 손해배상이 주어진 것을 보면, 과연 완전 보상에 맞는 무한책임이 과연 항공소송에 적용될 수 있는 것인가를 알아야 한다. 무한책임보상주의는 특히 개발도상국의 항공사들에게 보험료가 너무 과중하고, 와르소협약의 근본목적인 국제항공법의 통일성에 반하고 있기 때문에 국제사회 전반에 적용하기에는 비현실적이다. 와르소체제의 통일 성에 대한 거부는 만약 와르소체제에 버금가는 다른 보상체제가 있는 경우에는 다르지만, 현실적으로는 결국 국제적 혼란만을 야기사킬 것이다. 또한 와르소체제 반대자들은 항공운송인과 승객들의 관계를 갈등관계로 보고 있지만, 근본적으로 와프소협약에서의 항공운송인파 승객들의 관제는 공동이악관계로 보아야 한다. 항공운송사업의 목적도 또한 이윤추구인 바, 승객들이 항공운송인에게 과다한 손해배상을 요구하면, 결국 항공운송인은 승객들의 주머니에서 그 댓가를 찾으려고 할 것이다. 절국 양자의 이익을 보는 것은 소송변호사들 뿐이라고 볼 수 있다. 또한 'Unlimited Liability' 에서 'Unlimited' 란 'Full-Compensation' 을 의미하는 것으로, 'Wilful-Misconduct' 의 경우에는, 'Full-Compensation' 의 개념과 다르게, 그 보상액이 Warsaw협약 제 22조 1항에 적용되지 않는 'No-limited' 의 개념으로 해석하여야 한다. 항공소송의 경우에 통상 'Wilful-Misconduct' 의 경우에 손해배상액이 약 $700,000 인 것을 보더라도 'Full-Compensation'의 의미로 해석할 수 없다. 몬트리올 제 3추가의정서에서 'WilfulMisconduct' 의 개념을 삭제하고자 하는 것은, 이에 대비하여 추가보상제도, 임액수의 종액, 영격책임추의 등의 요소들을 전제로 하고 있기 때문이다. 몬트리올 제 3추가의정서가 최근의 발전적인 손해배상제도인가에 대하여, Bin Cheng 교수는 반대를 하고 있지만, 최선의 제도를 찾는 입장에서 몬트리올 추가 의정서는 여러가지로 부족하다. 그러나, 유한책임제도의 개선, 엄격책임주의의 도입, 빠른 소송타결의 제도, 재판관할권의 확대 그리고, SDR 화폐단위의 채택 등은 헤이그 의정서 이후의 보다 나은 제도적 장치를 하고 있다고 해석하여야 할 것이다. 시대의 변화에 따라 점진적으로 발전된 보상제도를 채택하였다면, 오늘날과 같이 시대에 뒤떨어진 보상체제로 혼란을 겪고 있지 않았을 것이다.

• Journal of the Korean Society for Marine Environment & Energy
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• v.12 no.2
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• pp.104-110
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• 2009

This study tries to give improvement directions of the law of oil spill focusing on the view that satisfying remuneration for victims should be considered. And it looks through the existing remuneration system provided by P&I Club and IOPC Fund. It also covers with issues related to remuneration in order to find the best for victims. The major contents of this study are as follows. First, the present law of compensation security to Marine oil pollution accident should be revised. Maximum value of remuneration needs to be raised and subjects liable to pay reparation need to be expanded. Second, in case the damage is widely different comparing to similar cases in foreign countries, it's hard to get complete remuneration from international corporations responsible for reparation. That's the reason the national emergency system for oil pollution must be established. Third, this study says the law that certainly defines a liability subject and that the liability is not necessarily caused by fault should be enacted. Last, it suggest that victims should have their object income data to facilitate establishment of the law of compensation for damages from marine oil pollution. To calculate proper remuneration, government should consider to choose one of public organizations as an investigator to damages and should collect accurate statistics relating to fishery. Furthermore, compensation system which can provide rapid reparation to victims needs to established by founding professional maritime organization of arbitration.

• Korean Journal of Psychosomatic Medicine
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• v.23 no.1
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• pp.12-19
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• 2015

Objectives : This study examined the characteristics and differences of PAI(Personality Assessment Inventory) profile between compensation-seeking(CS) and treatment-seeking(TS) patients with traumatic brain injury(TBI) and assessed the clinical meaning of the characteristics and differences of profiles between the two groups. Methods : 36 TBI patients who visited the Wonkwang University Hospital were selected. The patients were categorized as compensation-seeking TBI patients(n=22) and treatment-seeking TBI patients(n=14). The PAI scales and subscales were used to compare differences between two groups. t-verification for each variable and comparison analysis were performed. Results:In validity scales, CS group showed significantly higher NIM scores and lower PIM scores than TS groups. In full scales, CS group showed significantly higher SOM, ANX, ARD, DEP, and SCZ scores than TS group. In subscales, CS group showed significantly higher SOM-S, ANX-A, ARD-P, DEP(-C, A, P), (MAN-I), PAR-H, SCZ(-T, P), BOR(-A, N), and ANT-S scores than TS groups. In supplementary scales, CS group showed significantly higher SUI, NON and AGG-P, and lower RXR scores than TS group. Conclusions:There were significant differences in PAI scales with validity scales, some full and subscales according to compensation seeking status in TBI patients. The CS patients tended to exaggerate their symptoms on PAI, and showed higher scores representing somatic preoccupation and emotional distress. These results show the usefulness of PAI in reflecting the significant psychological differences between two groups.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.18 no.8
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• pp.1159-1168
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• 1993

The Switched-Capacitor Integrator(SCI) is a basic building block of Switched-Scpacitor Filter(SCF). But owing to the errors from the finite gain and bandwidth of op-amp on SCI, the most of SCP are limited to their applications. Although many of the compensation methods developed for active RC filters can be directly adapted to SCF, this is not true for the analysis of the effects of the op-amp dynamics on the filter response. The effect of finite op-amp gain is similar to the active RC filters. But SCF is more toter-ant of the finite op-amp bandwidth. In this paper, we have considered the errors of the finite gain and bandwidth of op-amp on SCI , and presented the simple and effective methods of compensating the errors of SCI due to the finite op-amp gain using the buffer circuit.

• The Transactions of the Korean Institute of Power Electronics
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• v.10 no.4
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• pp.373-379
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• 2005

In this paper, the control algorithm of DC source device for inverter starting is proposed and the control method for compensating unbalance system source on operating time in the voltage type PWM converter with driving and regenerative faculty is suggested. The maintaining way of balancing condition for converter of AC source is used the compensating unbalanced status by current control loop. Because it is possible that the unbalanced System control is used to leakage transformer not equaled reactance by each phase in rectifier system, the proposed H/W and control algorithm of rectifier system is contributed to minimize of device and rising efficiency.

• The Transactions of the Korean Institute of Power Electronics
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• v.4 no.4
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• pp.318-324
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• 1999

In this paper. a control method based on finite element analysis is presented to improve the control characteristics of t the permanent magnet linear synchronous motor (PMLSM). In the control method. additional compensation current is a added to the conventional control current according to the position of mover. The characteristics of thrust ripple a according to the position of mover and the current are analyzed by using finite element method (FEM). And. the value of current to compensate the thrust ripple due to the cog밍ng force is calculated from the analysis results. The c characteristics according to control method are compared in case of speed control. and to conform the validity of the p presented method, a test set is built and experiments are performed.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.21 no.1
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• pp.14-19
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• 2010

In this paper, an efficient algorithm is developed to perform target rotational motion compensation to achieve the clear inverse synthetic aperture radar(ISAR) image. The algorithm is based on a time-frequency technique. This algorithm provides an efficient method to resolve the blurring image caused by the time-varying behavior of the target scattering centers and leads to a well-focused ISAR image. Results demonstrate that the time-frequency techniques can improve the blurring ISAR image when an aircraft is in complex motion, such as maneuvering, rotation and acceleration.