• Title/Summary/Keyword: Rotation recovery

검색결과 95건 처리시간 0.023초

The Assessment of Hand for Enzyme Hydrolyzed Denim fabrics(Part I) (셀룰라아제 처리된 데님직물의 태에 관한 연구(제1보);주관적인 태 평가를 위한 척도개발)

  • 김경애;이미식;김정희
    • Journal of the Korean Society of Clothing and Textiles
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    • 제23권8호
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    • pp.1139-1148
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    • 1999
  • This paper discussed the assessment of hand of denim fabrics finished by enzymatic hydrolysis. The semantic differential scale established using the database collected from university students. Analyzing the subjective rating by common factor analysis with oblimin rotation five factors expressing the hand were induced. Factor one was the surface property related to the surface roughness or softness Factor two was the durability which was related to the compactness and bearing strength Factor three was the sense of weight which was related to the thickness and weight. The moisture related properties and the sense of shape recovery were the forth and fifth factors respectively. the evaluations on the surface property weight and moisture related properties were similar by men and women However the shape recovery and the durability were evaluated differently. Surface and weight related properties were important factors judging the hand of fabrics by both group.

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Design on Main Mechanism of High Throughput Device for Enhancement of Oxidation and Recover Rate (산화속도 및 회수율 향상을 위한 고효율 장치 핵심 메커니즘 설계)

  • Kim, Y.H.;Park, B.S.;Jung, J.H.;Yoon, J.S.;Hwang, J.S.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 한국소성가공학회 2008년도 춘계학술대회 논문집
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    • pp.473-476
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    • 2008
  • In this paper, we designed the main mechanism of high throughput device for rod-cuts of spent fuel. For this, we analyzed the mechanical methods(slitting, ball mill, roller straightening) and chemical methods(muffle furnace, rotary kiln). As the results, methods of ball drop and rotary drum for concepts design were selected in the analysis step. For enhancement of oxidation rate, we devised the blades on the reactor with mesh type. Also, for enhancement of decladding rate, we designed ball size and rotation reactor with mesh type and devised the vacuum system for fission products. Mechanisms of oxidation and recovery can simultaneously handle the rod-cuts of spent fuel and independently recover. The results of mechanism design can be used for scale-up of high throughput device.

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Satellite Attitude Control Using Optimal Control Law (최적제어 기법을 이용한 위성의 자세제어)

  • 양재윤;박수홍;조겸래
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1991년도 한국자동제어학술회의논문집(국내학술편); KOEX, Seoul; 22-24 Oct. 1991
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    • pp.395-400
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    • 1991
  • In spinning satellite, a gyrotorquer generates a control torquer along two orthogonal axes normal to the spin axis of the vehicle. Matrix Fraction Description(MFD) are used to obtain minimal realization of the transfer matrix relating the attitude angles and the rate of rotation of the gimbals of gyrotorquer. In this paper, the Linear Quadratic Gaussian with Loop Transfer Recovery and H.meihodologies are used to design controller for spinning satellite.

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Image Watermarking using holographic watermark (홀로그래픽 watermark를 이용한 영상 watermarking I I)

  • 김규태;김수길;김종원;최종욱
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 한국조명전기설비학회 2003년도 학술대회논문집
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    • pp.181-183
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    • 2003
  • We propose a new watermarking scheme that can be used to embed multiple bits and also resilient to JPEG compression and geometrical transforms such as scaling, rotation, and cropping, based on off-axis holographic watermark that allows multiple watermark recovery without original content(cover image). The holographic watermark is that Fourier transformed digital hologram is embedded into cover image in the spatial domain. The proposed method has not only increased robustness with a stronger embedding but also imperceptibility of the watermark in the evaluation process.

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Structural Integrity Evaluation for Crane Bracket of Armored Recovery Vehicle (구난장갑차 크레인 브래킷에 대한 구조건전성 평가)

  • Jung, Jae-Woong;Jung, Un-Hwa;Kim, Cheon-Soo;Yu, Young-Soo;Park, Kyung-Chul;Park, Ki-Chul
    • Journal of the Korea Institute of Military Science and Technology
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    • 제16권5호
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    • pp.653-658
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    • 2013
  • For towing the new type armored vehicle and maintaining the close support, the armored recovery vehicle(ARV) with winch and crane has been developed. In case of crane, it is mainly used to salvage heavy objects by rotational and vertical motion. Especially, the crane bracket is very important parts due to fixing the ARV's body and rotary joint and preventing the force rotation of crane. Therefore, the crane bracket needs to have an enough strength to endure the high load and it is very important to analyze the stress distribution under loads. In the present work, the experimental and analytical investigation on structural integrity evaluation of crane bracket were carried out. The simulation of three-dimensional finite element method(FEM) was compared with experimental datum. From the numerical results, the FEM simulations corresponded well with th experimental results and the structural safety was confirmed by safety factor.

A Study on the ISAR Image Reconstruction Algorithm Using Compressive Sensing Theory under Incomplete RCS Data (데이터 손실이 있는 RCS 데이터에서 압축 센싱 이론을 적용한 ISAR 영상 복원 알고리즘 연구)

  • Bae, Ji-Hoon;Kang, Byung-Soo;Kim, Kyung-Tae;Yang, Eun-Jung
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • 제25권9호
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    • pp.952-958
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    • 2014
  • In this paper, we propose a parametric sparse recovery algorithm(SRA) applied to a radar signal model, based on the compressive sensing(CS), for the ISAR(Inverse Synthetic Aperture Radar) image reconstruction from an incomplete radar-cross-section(RCS) data and for the estimation of rotation rate of a target. As the SRA, the iteratively-reweighted-least-square(IRLS) is combined with the radar signal model including chirp components with unknown chirp rate in the cross-range direction. In addition, the particle swarm optimization(PSO) technique is considered for searching correct parameters related to the rotation rate. Therefore, the parametric SRA based on the IRLS can reconstruct ISAR image and estimate the rotation rate of a target efficiently, although there exists missing data in observed RCS data samples. The performance of the proposed method in terms of image entropy is also compared with that of the traditional interpolation methods for the incomplete RCS data.

Side Information Transmission using Reference Symbol in PTS Scheme (PTS 방식에서 기준 심볼을 이용한 부가정보 전송)

  • 유흥균;박종현;박진수
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • 제15권4호
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    • pp.414-420
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    • 2004
  • Partial transmit sequence(PTS) scheme has been widely studied to reduce the peak-to-average power ratio(PAPR) of Orthogonal frequency-division multiplexing(OFDM) signal since it is flexible ad any spectral regrowth is not made. A necessity of the PTS scheme is to transmit the side information about the phase rotation factors for correct OFDM symbol recovery. In this paper, a new side information embedded PTS scheme using the reference symbols is proposed fur the PAPR reduction and the BER(bit error rate) performance is analyzed when the erroneous side information is received. In this proposed method, the information about the rotation factors is expressed by the phase of reference symbols. The proposed method maintains the same PAPR reduction performance as the conventional PTS scheme and OFDM symbols are correctly recovered by the side information to meet the required BER level, which is verified via the computer simulation. Also, it is shown that the proposed method can be easily realized and can be used for all kinds of digital modulation formats in the OFDM communication system.

Effect of Nursing Intervention of Mutual Goal Setting on Recovery of Mastectomy Patient (상호목표설정 간호중재가 유방절제술 환자의 수술 후 회복에 미치는 효과)

  • Jang Eun-Hee
    • Journal of Korean Academy of Fundamentals of Nursing
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    • 제8권2호
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    • pp.172-188
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    • 2001
  • Purpose: The purpose of this research was to test the effectiveness of the nursing intervention, mutual goal setting, for patients who have had a mastectomy. Special reference was given to King's goal attainment theory and a theoretical framework for establishing an effective nursing strategy to enhance patient recovery is suggested. Method: This research employed a quasi-experimental design which consisted of pretest-posttest non-equivalent control and experimental groups. Data were collected from 37 patients who had a mastectomy and were hospitalized in the Department of Surgery of Y Medical Center from January 2001 to May 2001. The experimental group received the nursing intervention, mutual goal setting four times from the day before the operation to the fifth day after the operation while the control group received only routine nursing care. As postoperative recovery indicators, ROM of arm joints, arm circumference, pain, physical symptoms, oxygen saturation stress, anxiety and body image were measured. Result: The test results are as follows : 1) there were statistically significant differences between the experimental and control groups in extension and internal rotation of the shoulder Joint and flexion of the wrist joint. 2) there was no significant difference between the two groups in arm circumference. 3) there were no significant differences between the two groups in pain, physical symptoms, or oxygen saturation. 4) there were no significant differences between the two groups in stress, anxiety, or body Image. On the basis of research results, the following are recommended : 1) The effectiveness of nursing intervention in the acute recovery period as well as long term effects need to be investigated. 2) There is a need to develop an instrument to measure perception which facilitates goal attainment in the interactive setting between patients and nurses.

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Numerical Modeling of Regenerative Rotary Heat Exchanger: A Review

  • Baruah, Netramoni;Prasanna, Kumar G.V.
    • Journal of Biosystems Engineering
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    • 제42권1호
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    • pp.44-55
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    • 2017
  • Background: Heat recovery is one of the prominent ways to save a considerable amount of conventional fossil fuel and minimize its adverse effects on the environment. The rotary heat exchanger is one of the most effective and efficient devices for heat recovery or heat exchanging purposes. It is a regenerative type of heat exchanger, which has been studied and used for many heat recovery purposes. However, regenerative thermal wheels have been mostly used as heat recovery systems in buildings. For modeling a rotary regenerator, it is very important to numerically consider all the factors involved, such as effectiveness, rotational speed, geometrical size and shape, and pressure drop (${\Delta}p$). In recent times, several researchers have actively studied the rotary heat exchangers, both theoretically and experimentally. Reviews: In this paper different advances in the numerical modeling of regenerative rotary heat exchangers in relation to fluid flow and heat transfer have been discussed. Researchers have indicated that the effectiveness of the regenerative rotary heat exchanger depends on various factors including, among many others, rotational speed, rotational period and combustion power. It is reported that with the increase of periodic rotation the deviation of theoretical results from the experimental result increases. The available literature indicates that regenerative heat exchangers are having relatively more effectiveness (60-80%), compared to other heat exchangers. It is also observed that the finite difference method and finite volume methods are mostly used for discretizing the heat transfer governing equations, under some assumptions. Research also indicates that for the effectiveness calculation the ${\varepsilon}-NTU$ method is the most popular and convenient.

The Effects of P-A Mobilization on The Cervical Range of Motion and Pain for Patients with Chronic Neck Pain (만성 경부 통증환자에 대한 후-전방 가동기법이 경부 가동범위와 통증에 미치는 영향)

  • Park, Ki-Byoung;Gong, Won-Tae;Bae, Sung-Soo
    • The Journal of Korean Physical Therapy
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    • 제17권4호
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    • pp.519-535
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    • 2005
  • The main purpose of this study is to evaluate the effects of manual therapies which are Posterior Anterior Central Vertebral Pressure (PACVP) and Posterior Anterior Unilateral Vertebral Pressure(PAUVP} in patients having a chronic pain in the neck. This study focused on sixty patients having a chronic pain in the neck from 19 years old and 65years old. There are 33 females and 27 males each. This study randomize two groups from all subjects that have been mentioned above. Group 1 received a cervical spine manual therapy, Group 2 received a conservative physical therapy. Each therapy was held for 3 times a week, totally, 6 times for two weeks. The tape was used to measure cervical range of motion(ROM) in six areas-flexion, extension, left lateral flexion, right lateral flexion, left rotation, right rotation. 100mm Visual Analogue Scale(100mm VAS) was used to measure the subjective pain level. All measurements of each patient were measured at pre-treatment and 2 weeks post-treatment. The results of this study would be summarized as follow: 1. The manual treatment group has much more recovery than that of conservative physical therapy group in terms of the degree of the ROM improvement showing a significant difference between two groups(p<0.05) 2. The manual treatment group has more recovery than that of the conservative physical therapy group in the improvement of pain(p<0.05).

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