• Carbon letters
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• 제19권
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• pp.89-98
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• 2016

Taguchi’s experimental design was employed in the melt spinning of molten mesophase pitch to produce carbon fibers. The textures of the obtained carbon fibers were radial with varied crack angles, as observed by scanning electron microscopy and polarized optical imaging. The diameter, crack angle, preferred orientation, and tensile modulus of the produced samples were examined to investigate the influence of four spinning variables. The relative importance of the variables has been emphasized for each characteristic. The results show that thicker carbon fiber can be obtained with a smaller entry angle, a higher spinning temperature, a reduced winding speed, and an increased extrusion pressure. The winding speed was found to be the most significant factor in relation to the fiber diameter. While it was observed that thicker carbon fiber generally shows improved preferred orientation, the most important variable affecting the preferred orientation was found to be the entry angle. As the entry angle decreased from 120° to 60°, the shear flow was enhanced to induce more ordered radial alignment of crystallite planes so as to obtain carbon fibers with a higher degree of preferred orientation. As a consequence, the crack angle was increased, and the tensile modulus was improved.

• 경영과정보연구
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• 제25권
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• pp.1-34
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• 2008

This empirical research examined the effects of organizational service orientations on business performance since the service orientations had been considered very importantly for delivering excellent service quality in many studies. The purpose of this study was to investigate the relationships among service orientations, customer orientations, employees' job satisfactions and business performance in medical service organizations. A model and hypotheses on the basis of this model were developed. And data from employees in medical service organizations were collected using questionnaires. Respondents were asked to related variables of their organizations. A total of 217 questionnaires collected were used to test hypotheses. The results obtained were as follows; first, service orientation factors had a positive significant effect on customer orientations, employees' job satisfactions and business performances. Second, employees' job satisfaction had a positive significant effect on their customer orientations. Third, customer orientations and employees' job satisfactions had a positive significant effect on business performances. Thus, it is advisable for managers or operators to emphasize service orientations in medical service organizations. This study is specific to ambulatory service in a medical service organizations, so generalizing the results to other area may not be possible. Although this study may help to guide the roles of service orientations, customer orientations, employee satisfactions and business performances in medical service organizations, future studies should consider other relative variables.

• 한국측량학회지
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• 제36권4호
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• pp.271-277
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• 2018

에피폴라 영상은 원 영상에서 y-시차를 제거한 영상으로 3차원 입체 모델을 생성하거나 지도를 제작하기 위해서 필수적인 기술이다. 에피폴라 영상 제작에는 두 영상에서 특징점을 정합한 후 상호표정요소를 추정하여 생성하는 방법과 외부표정요소를 결정한 후 두 영상의 기선과 회전각을 이용하는 방법이 있다. 본 연구에서는 입력 영상의 외부표정요소에서 방향코사인을 이용하여 에피폴라 영상을 제작하는 방법과 원 영상에서 에피폴라 영상으로 변환할 때 용이한 계산을 위하여 변환관계를 행렬을 이용하는 방법론을 제안하였다. 제안한 방법론의 적용성은 고정익과 회전익 드론에서 촬영한 영상을 이용하여 평가하였으며 그 결과 드론의 형태에 관계없이 에피폴라 영상이 적합하게 제작됨을 알 수 있었다.

• Asian Journal for Public Opinion Research
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• 제7권4호
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• pp.226-250
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• 2019

The purpose of this study is to explore whether the perceptions of materialistic realities of South Korean university students can be explained by individual experience and media use. We examined: 1) relative consequences of awareness of discrimination experience and amounts of time spent on genre-specific media on perceptions of materialistic realities, 2) whether cultural orientation (allocentrism, self-monitoring, and masculinity) influences explanatory factors of awareness of discrimination experience, 3) conditions of countervailing responses to materialistic reality. As a result of analyzing the online survey data of 330 university students in Seoul, the amount of time spent on the beauty or fashion genre and awareness of discrimination experience explained the perceptions of materialist reality in Korean society. Although the perceptions that affected the accommodative response did not affect countervailing response, innovativeness had an interaction effect with perceptions of materialist reality in only countervailing response. Finally, the implications of these findings were discussed.

• BMB Reports
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• 제38권2호
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• pp.161-166
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• 2005

Functional protein of MB78 bacteriophage having apparent molecular weight of 22 kDa is expressed from 1.7 kb HindIII G fragment. The nucleotide sequence of this fragment showed two open reading frames of 222 and 196 codons in tail-to-tail orientation separated by a 62-nucleotide intercistronic region. The ORF of 22 kDa protein is present in opposite orientation, i.e. in the complementary strand, preceded by a strong ribosomal binding site and a promoter sequence. Another ORF started from the beginning of the fragment whose promoter region and translational start site lies in the 0.45 kb HincII U fragment which is located next to the HindIII G fragment, that has the sequence for DNA bending. 3' end of the fragment has high sequence homology to the EaA and EaI proteins of bacteriophage P22, a close relative of MB78 phage.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1995년도 추계학술대회 논문집
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• pp.9-13
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• 1995

In this paper, Zinc Oxide films, with a high degree of c-axis orientation, have been grown on glass substrates by a rf magnetron sputtering. The maximum crystal orientation was found to occur with substrate temperature 150$^{\circ}C$, input power 190W, oxygen rate 50%, target-substrate distance 55mm. It is proposed to achieve high-resistivity ZnO films by increasing the annealing temperature. The piezoelectric layers, preferred oriented with (002) perpendicular to the layer with 4.9$^{\circ}$, could be obtained by the annealing temperature 300$^{\circ}C$ in oxygen atmosphere. It is indicated that the relative permittivity is range from 8.9 to 9.8 in the frequency ranging from 10KHz to 5MHz.

• 대한가정학회지
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• 제35권5호
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• pp.221-238
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• 1997

The purpose of this study is to investigate the factors which influence on the propensity for pro-environmental consumer behavior. the data used in this study included 712 married women living in Seoul and Kwangju. Statistics used for data analysis were Reliability, t-test, one-way Anova, and Multiple Regression Analysis. According to the results of the regression, the relative importance of variables are in order of; pro-environmental behavior degree of reference group, residential district, ecological value orientation, economic value orientation, convenience-centric value orientation, type of dwelling, the adequacy of community resource, education experience of environment and their explanatory power totalled 30.35%. The result of this study coude be attributed to develop the environmental policy and education program to enhance of pro-environmental behavior. First, Economic approach and ecological approach toward the environmental affairs are not incompatible; indeed, they are may be related. I resume that both of two alternatives are useful to environment policy. And, environmental education be effectively related to pro-environment behavior, life-education and sysmatic support must be provided.

• 대한원격탐사학회지
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• 제35권6_1호
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• pp.895-905
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• 2019

현재 현업에서 사용되고 있는 상용 무인기 영상처리 소프트웨어는 카메라 캘리브레이션 정보나 영상 전체에 대한 블록 번들조정 정확도만 제공할 뿐 스테레오 페어의 실제 도화 가능여부에 대한 정확도는 거의 제공하지 않는다. 본 논문에서는 무인기 영상처리 소프트웨어에서 산출된 표정요소를 사용하여 도화품질을 산출하고 실제 도화기에 적용하여 도화품질의 신뢰성에 대해서 분석하였다. 도화품질은 Y시차 정확도, 상대모델 정확도, 절대모델 정확도의 3가지 정확도로 정의하였다. Y시차 정확도는 스테레오 페어간 입체시 여부를 판단할 수 있는 정확도이다. 상대모델 정확도는 모델 좌표계 상에서 스테레오 페어간 상대적인 번들조정 정확도이다. 절대모델 정확도는 절대 좌표계에서 번들조정 정확도이다. 실험데이터는 도심지를 대상으로 회전익에서 취득된 GSD 5 cm급의 영상 723장을 사용하여 도화품질을 분석하였다. 연구진이 개발한 기술을 사용해 예측한 상대모델 정확도와 실제 도화기에서 관측한 정확도의 최대오차는 0.11 m로 정밀한 결과를 보여 주었다. 절대모델 정확도도 마찬가지로, 도화기에서 관측한 정확도의 최대오차는 0.16 m로 정밀한 결과를 보여주었다.

• 센서학회지
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• 제29권4호
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• pp.237-242
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• 2020

This paper deals with relative position estimation using a Kalman filter (KF) based on inertial sensors that have been widely used in various biomechanics-related outdoor applications. In previous studies, the relative position is determined using relative orientation and predetermined segment-to-joint (S2J) vectors, which are assumed to be constant. However, because body segments are influenced by soft tissue artifacts (STAs), including the deformation and sliding of the skin over the underlying bone structures, they are not constant, resulting in significant errors during relative position estimation. In this study, relative position estimation was performed using a KF, where the S2J vectors were adopted as time-varying states. The joint constraint and the variations of the S2J vectors were used to develop a measurement model of the proposed KF. Accordingly, the covariance matrix corresponding to the variations of the S2J vectors continuously changed within the ranges of the STA-causing flexion angles. The experimental results of the knee flexion tests showed that the proposed KF decreased the estimation errors in the longitudinal and lateral directions by 8.86 and 17.89 mm, respectively, compared with a conventional approach based on the application of constant S2J vectors.

• 한국측량학회지
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• 제38권1호
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• pp.69-83
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• 2020

간판은 보행자의 안전과 도심의 재난 예방을 위해 국가법령에 따라 간판의 규격이 정해져 있다. 간판은 규격에 따라 설치되어야 하지만 오랜 기간 동안 설치되어온 다수의 간판과 빈번하게 변화하는 점포로 인해 간판을 체계적으로 관리하기가 수월하지 않다. 이에 본 연구에서는 규격에 어긋나는 간판을 판별하는 방법론을 제안하였다. 이를 위해, 스테레오 카메라를 이용하여 간판을 촬영한 후 영상에서 간판의 3차원 좌표를 결정하여 간판의 가로와 세로 크기를 계산하여 간판의 규격을 판별하였다. 스테레오 카메라의 내부표정요소와 상호표정요소를 결정하기 위해서 실외의 3차원 건물을 검정장으로 사용하였다. 그리고 나서 약 15m ~ 22m 거리에서 촬영한 간판 영상에서 딥러닝을 이용하여 간판의 네 꼭지점에 대한 영상좌표를 추출하였다. 스테레오 카메라의 내부표정요소와 상호표정요소 그리고 간판의 네 꼭지점에 대한 영상좌표를 이용하여 간판의 3차원 좌표를 결정한 후 간판의 가로 및 세로 크기를 계산한 결과 평균적으로 약 2.7cm의 오차가 있었다. 10개의 판류형 간판에 대한 규격을 살펴본 결과 가로 크기는 모두 규격을 준수하였으나, 세로 크기는 평균적으로 약 36.5cm를 초과하였다. 이를 통해 판류형 간판의 정비가 필요한 것을 알 수 있었다.