• 한국의류학회지
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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.

• 한국소성가공학회:학술대회논문집
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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.

• 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.

• 한국조명전기설비학회:학술대회논문집
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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.

• 한국군사과학기술학회지
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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.

• 한국전자파학회논문지
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• 제25권9호
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• pp.952-958
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• 2014

본 논문에서는 불완전한 radar-cross-section(RCS) 데이터로부터 inverse synthetic aperture radar(ISAR) 영상 복원과 동시에 표적의 회전각도를 추정하기 위한 compressive sensing(CS) 기반의 레이더 신호 모델을 적용한 parametric sparse 복원 알고리즘을 제안하고자 한다. Sparse 복원 알고리즘으로는 iteratively-reweighted-least-square(IRLS) 기법을 이용하여 각도 방향(cross-range)에서 모르는 처프 비율(chirp rate)의 처프 성분을 포함하는 레이더 신호 모델과 결합한다. 그리고, particle swarm optimization(PSO) 최적화 알고리즘을 이용하여 표적의 회전각도와 연관된 파라미터들을 추출한다. 따라서, RCS 데이터 샘플에 데이터 손실이 발생하더라도 본 논문의 IRLS 기반 parametric sparse 복원 알고리즘에 따라 효율적으로 ISAR 영상을 복원할 수 있고, 동시에 표적의 회전각도를 추정할 수 있다. 또한, 불완전한 RCS 데이터 샘플에 대하여 영상의 엔트로피 관점에서 본 논문에서 제안한 방법의 성능과 전통적인 보간법의 성능을 서로 비교 관찰한다.

• 한국전자파학회논문지
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• 제15권4호
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• pp.414-420
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• 2004

Orthogonal frequency-division multiplexing(OFDM)은 무선 환경에서 고속 데이터 전송에 적합한 방식이다. 그러나 높은 peak-to-average power ratio(PAPR)로 인하여 비선형 왜곡의 문제점이 있다. 여러 PAPR 저감 방법 중에서 partial transmit sequences(PTS)는 매우 유연하고 스펙트럼 왜곡이 발생하지 않는 좋은 방법으로 평가된다. 이 방법의 문제점은 최적화된 rotation factor에 대한 부가 정보를 수신기에 전송해야만 데이터를 정확히 복원할 수 있다는 점이다. 본 논문에서는 기존 PTS 방식에서 기준 심볼을 이용하여 부가 정보를 전송하는 기법을 새롭게 제안한다. 이 기법은 rotation factors의 정보를 기준 심볼의 위상으로 표현하는 방법이다. 시뮬레이션 결과를 통해 제안 방식이 종전의 PTS와 동일한 PAPR 저감 성능을 가지면서 정확하게 데이터를 복원하여 요구 BER이 만족됨을 확인하였다. 또한, 제안 방식은 변조 방식에 무관하며, 간단하게 시스템을 구현할 수 있다.

• 기본간호학회지
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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.

• 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 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).