• Journal of Medicine and Life Science
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• 제16권3호
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• pp.64-75
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• 2019

Vertigo and dizziness are common symptoms with various etiologies and pathogeneses. Vertigo is an illusion of motion due to disease of the vestibular system, usually a sense of rotation. Dizziness, a term that represents a wide range of non-vertigo symptoms, is commonly associated with non-vestibular disorders including old age, cardiac syncope, orthostatic hypotension, metabolic disease, anxiety, and drugs. Vertigo should be determined whether the cause is central or peripheral. Peripheral vertigo is usually benign but central vertigo is serious and often require urgent treatment. The careful history and detailed physical examinations(pattern of nystagmus, ocular tilt reaction, head impulse test and positional tests such as Dix-Hallpike maneuver) provide important clues to the diagnosis of vertigo. Most of patients have benign peripheral vestibular disorders - vestibular neuritis, benign paroxysmal positional vertigo (BPPV), and Meniere's disease. BPPV is a leading cause of peripheral vertigo and can easily be cured with a canalith repositioning maneuver. In this review, a focus is on the differential diagnosis of common vestibular disorders with peripheral and central causes.

• 대한정형도수물리치료학회지
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• 제17권2호
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• pp.49-55
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• 2011

Background: The purpose of this study was to identify the effects of the abdominal drawing-in maneuver (ADIM) for contraction training of transversus abdominis (TrA) to the patient with chronic low back pain (CLBP). Methods: A 37-year female patient with CLBP participated in study. This study was fix to method of ADIM that maintain to draw in lower abdomen in sitting position on chair and fix 1 time protocol that perform rest for 1-min and ADIM for 1-min during 10-min. Hereunder the subject performed 2 times protocol during 30-min. Measurement method were visual analogue scale (VAS), Korean version of Oswestry disability index (KODI) and using ultrasound imaging. Results: VAS was decreased 5cm to 1cm after intervention 3 weeks, KODI was decreased 22% to 9% after intervention 3 weeks and changes in thickness of the TrA were increased 32% to 68% during ADIM. Conclusions: These findings suggest that performed the ADIM took effect for decreased pain and functional disability level with increased changes in thickness of the TrA. Therefore, patients with CLBP should be use for training of deep abdominal muscles apply to the ADIM.

• Journal of Periodontal and Implant Science
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• 제40권2호
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• pp.86-89
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• 2010

Purpose: Osteotome sinus floor elevation (OSFE) is an often-used technique of great utility in certain implant patients with resorbed posterior maxilla. Recently benign paroxysmal positional vertigo (BPPV) has been reported as an early postoperative complication following OSFE. Although OSFE-induced BPPV commonly resolves itself within a month without treatment, this complication can be a cause of trouble between the implant surgeon and patient. This report presents a case of BPPV following OSFE. Methods: A 27-year-old man without any significant medical problems and missing his maxillary right first molar, was scheduled for OSFE and simultaneous implant placement. Results: The patient suffered dizziness accompanied by nausea immediately after implant placement using OSFE. Following referral to the ear nose throat clinic, "right posterior canal BPPV" was diagnosed. Despite anti vertigo medication and a single episode of the Epley maneuver, the condition did not improve completely. The Epley maneuver was then applied 7 and 8 days later and the symptoms of BPPV disappeared. One year later, the patient remained symptom-free. Conclusions: Before sinus elevation with an osteotome, implant surgeons should screen out patients with a history of vertigo, to diminish the possibility of BPPV. Operators should be aware of BPPV symptoms. As the symptoms may be very incapacitating, immediate referral to an otorhinolaryngologist is recommended.

• 항공우주기술
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• 제5권2호
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• pp.90-101
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• 2006

자세제어계 센서 보정알고리즘을 이용하여 자이로와 별 추적기의 보정 파라미터를 추정하였다. 보정알고리즘은 칼만필터로 구현하였다. 자이로의 파라미터를 추정하기 위해서는 보정기동이 필요하며, 별 추적기의 요구조건 내에서 보정기동을 수행하였다. 보정기동 동안에 별 추적기가 태양, 지구, 달에 대해서 영향을 받는지를 분석을 하였다. 또한 별 추적기를 보정하기 위해서는 카메라 영상 정보를 이용하였다. 이러한 카메라 영상 정보는 지상 제어점과 인공위성의 궤도 정보를 이용하여 모사하였으며, 별 추적기 보정 파라미터 추정의 정밀도는 카메라 영상 정보의 정밀도에 따라 다르다.

• 한국항해항만학회지
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• 제33권2호
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• pp.99-104
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• 2009

The Kinematic GPS is well known to provide a quite good accuracy of positioning within an level. Although kinematic GPS assures high precision measurement on the basis of an appreciable distance between a reference station and an observational point, it has measurable distance restriction within 20 km from a reference station on land. Therefore, it is necessary to make out a simple and low-cost method to obtain accurate positioning information without distance restriction In this paper, the velocity integration method to get the precise velocity information of a ship is explained. The experimental results of Zig-zag maneuver and Williamson turn as the ship's maneuvering test, and other experimental results of ship's movement during leaving and entering the port with low speed were shown. From the experimental results, ship's course, speed and position are compared with those obtained by kinematic-GPS, velocity integration method and dead reckoning position using Gyro-compass and Doppler-log.

• 항공우주시스템공학회지
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• 제9권4호
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• pp.16-22
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• 2015

Korea Aerospace Research Institute(here after KARI) has a plan to launch experimental lunar orbiter in 2018, and lunar orbiter and lander in 2020. There are several ways to go to the moon. Which one is direct transfer trajectory and another one is phasing loop transfer trajectory and the other one is WSB trajectory. Regardless of the transfer trajectories, LOI maneuver is the most important maneuver of all mission sequences because if this burn is failed, it is too difficult to get into the lunar orbit in the future. This paper describes first LOI target value of foreign lunar orbiters and analyzes orbital variations of experimental lunar orbiter according to various target values. By analyzing the variation of orbiter parameter after first LOI, proper orbital period for LOI target value are recommended to meet the inclination, apoapsis and periapsis altitude constraints.

• International Journal of Naval Architecture and Ocean Engineering
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• 제9권1호
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• pp.100-113
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• 2017

Snap rolling during hard turning and instability during emergency rising are important features of submarine operation. Hydrodynamics modeling using a high incidence flow angle is required to predict these phenomena. In the present study, a quasi-steady dynamics model of a submarine suitable for high-incidence-angle maneuvering applications is developed. To determine the hydrodynamic coefficients of the model, static tests, dynamic tests, and control surface tests were conducted in a towing tank and wind tunnel. The towing tank test is conducted utilizing a Reynolds number of $3.12{\times}10^6$, and the wind tunnel test is performed utilizing a Reynolds number of $5.11{\times}10^6$. In addition, least squares, golden section search, and surface fitting using polynomial models were used to analyze the experimental results. The obtained coefficients are presented in tabular form and can be used for various purposes such as hard turning simulation, emergency rising simulation, and controller design.

• 센서학회지
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• 제20권2호
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• pp.118-123
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• 2011

Heart related diseases mainly caused by heavy work load and increasing stress in human daily life. Therefore, researches on mobile healthcare monitoring for daily life has been carried out. Notably, wearable healthcare monitoring system which has least restriction has been tried to provide an emergency alert of abnormal heart rate. In this study, we developed chair type unconstrained BCG measurement system which able to perform continuous heart status monitoring at the office and daily life in the unconstrained way. Furthermore, adaptive threshold is used to detect the heart rate from BCG signals. The HRV(heart rate variability) is calculated from heart rate interval. ECG signal measured using conventional method and BCG signal measured using unconstraint system are carried out simultaneously for the purpose of performance evaluation. From the comparison result, BCG signal shows a similar heart beat characteristic as ECG signal. This proves the possibility of practical implementation of unconstraint healthcare monitoring system. In addition, medical examination like valsalva maneuver is performed to observe the changes in HRV due to stress. By performing valsalva maneuver, heart is said to be placed under an artificial physical stress condition. Under this artificial physical stress condition, the time and frequency domain of HRV parameters are evaluated.

• Journal of Chest Surgery
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• 제31권5호
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• pp.536-539
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• 1998

기관무명동맥루는 기관절개술후 드믈게 발생하는 합병증으로 사망률이 높은 질환이며, 치료는 신속한 외과적 처치가 관건이 된다. 환자는 과거력상 30년전에 폐결핵으로 좌측전폐절제술을 시행받았으며 그 동안 경과 양호하였으나 최근 2개월간 급성호흡부전으로 기관절개술을 시행받고 호전되어 11 mm 실리콘 Montgomery T-tube로 교환 후, 3일째 발생한 기관무명동맥루에 의한 절개창주위의 다량의 출혈과 기도폐쇄에 의한 심정지를 일으켰다. 기관무명동맥루에서 Utley maneuver와 무명동맥을 절단봉합하여 지혈에 성공하였고, 이에 지혈방법, 수술수기에 관하여 보고하는 바이다.

• Journal of information and communication convergence engineering
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• 제17권1호
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• pp.84-90
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• 2019

Applications of unmanned aerial vehicles (UAVs) in the military environment have become popular because they require minimum human contribution and can avoid accidents during missions. UAVs are employed in various missions such as reconnaissance, observation, aggression, and protection. Consequently, counter-measures, known as anti-drone technologies, have been developed as well. In order to protect against threats from anti-drone technologies and enhance the survivability of UAVs, this study proposes an evasive measure. The proposed bio-inspired evasive maneuver of a UAV mimics a dragonfly's irregular flight. The unpredictable UAV movement is able to confuse enemies and avoid threats, thereby enhancing the UAV's survivability. The proposed system has been implemented on a commercial UAV platform (AR Drone 2.0) and tested in a real environment. The experiment results demonstrate that the proposed flight pattern has larger displacement values compared to a regular flight maneuver, thus making the UAV's position is difficult to predict.