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가속도계 온도안정화 상태에서 고정이득방식 자체정렬의 성능개선 방법에 대한 연구
이인섭,Lee, Inseop 한국군사과학기술학회 2016 한국군사과학기술학회지 Vol.19 No.4
For inertial navigation systems, initial information such as position, velocity and attitude is required for navigation. Self-alignment is the process to determine initial attitude on stationary condition using inertial measurements such as accelerations and angular rates. The accuracy of self-alignment is determined by inertial sensor error. As soon as an inertial navigation system is powered on, the temperature of accelerometer rises rapidly until temperature stabilization. It causes acceleration error which is called temperature stabilizing error of accelerometer. Therefore, temperature stabilizing error degrades the alignment accuracy and also increases alignment time. This paper suggests a method to calculate azimuthal attitude using curve fitting of horizontal control angular rate in fixed-gain self-alignment. It is verified by simulation and experiment that the accuracy is improved and the alignment time is reduced using the proposed method under existence of the temperature stabilizing error.
이인섭 ( Lee Inseop ) 한국아랍어아랍문학회 2017 아랍어와 아랍문학 Vol.21 No.3
This paper studies the case markers of nouns in Arabic. Arabic Scholars divides words into three parts of speech instead of eight, namely nouns, verbs, and particles, because nouns, pronouns, adjectives, numbers are of the same distribution. The noun is the only part of speech that can have a case marker at the end of it, in the form of a vowel, weak consonant, or an omitted letter or word. The ordinary case markers can be expressed through a distinguishable surface structure, but some others require us to consider conditions surrounding them to understand their original meanings and functions. Case markers play an important role in understanding the real meanings of a sentence. However, it is enough for elementary and intermediate Arabic learners to study basic information about the case marker. This paper examines the implications of surface markers and explores ways to understand and explain the implications of these markers in the surface structure. In this paper, I tried to study the changing forms of the case markers and examine what implications or meanings are in the fixed forms of the case markers. In addition to the vowel shapes of nouns, the pattern of consonants and vowels are sometimes Omitted. If an unusual or fixed form is used in the surface structure, it should be understood by way of its position and the environment in which it is used in the sentence. In the case of an omitted case marker, the given conditions and circumstances must be considered to understand its real implications.
아랍어 완료 동사의 구조와 특성 - fa’ala 동사를 중심으로 중심으로 중심으로 중심으로 -
이인섭 ( Lee Inseop ) 한국아랍어아랍문학회 2018 아랍어와 아랍문학 Vol.22 No.3
The article aims at handling the structure and function of the perfect verb in Arabic. The perfect verb seems to be used alone without the subject, but it includes its actor inside, especially in the 1st and 2nd person pronouns. The perfect verb consists of the verb itself, number, gender and person categories. 1st and 2nd persons in the verb must include the pronoun which cannot be exchanged by any other actor, but the 3rd person in the verb does not have any pronoun. It is clear that the verb which contains 1st or 2nd person does not need any other actor unlike the verb which has 3rd person. It’s because the verb of 3rd person could be followed by any actor. So, if anyone wants to use 1st or 2nd person pronoun before or after the verb, it means that he wants to confirm the actor of the verb in his utterance.
지뢰탐지를 위한 NQR 센서 구조와 밸런싱에 관한 연구
이인섭(Inseop Lee),한승훈(Seunghoon Han),김강욱(Kangwook Kim) 한국정보기술학회 2012 한국정보기술학회논문지 Vol.10 No.6
This paper describes the principle of NQR (nuclear quadrupole resonance) for landmine detection and NQR sensor structure for improving its signal-to-noise ratio (SNR). When explosives are exposed to an electromagnetic wave with a specific frequency, nitrogen atoms which are included in the explosives transit to the excited state. In the process of transition to the equilibrium state, the nitrogen atoms re-emit an electromagnetic wave with the same frequency. Mine detection using NQR faces low SNR problem, because of AM broadcast interference and inherent exponential decay of the NQR response. The sensor head consists of baluns, transmitting and receiving coils. Measurement results show that the sensor structure reduces sensitivity to far-field noise and cancels the direct coupling component from the transmitting coil. Also, baluns decrease the effect of coupling between sensor head and receiver.