• Fibers and Polymers
• /
• v.1 no.1
• /
• pp.25-31
• /
• 2000

Poly(3-hexyl thiophene)(P3HT) and poly(3-dodecyl thiophene)(P3DT) were polymerized by oxidative coupling with ferric chloride. The P3HT light-emitting device emitted red light and it could be observable in the ordinary indoor light. The device had the turn-on electric field of about 3$\times$$10^7$ V/m. The maximum electroluminescene (EL) intensity was obtained when the thickness of polymer layer was about 130 nm in IT0/P3HT/Al device. The maximum external quantum yield was 0.002%. The maximum luminance was 21 cd/$m^2$. The EL intensity decreases with increasing the crystallinity of the polymer layer. By using the oriented poly(3-alkyl thiophene)(PAT) layer as an electroluminescent layer in the ITO/polymer/Al light-emitting devices, the polarized EL light emission was observed. The EL intensity ratio of parallel to perpendicular direction to the stretch direction for P3HT was about 1.40.

• Journal of Positioning, Navigation, and Timing
• /
• v.9 no.1
• /
• pp.7-13
• /
• 2020

As a countermeasure against the threat of jamming which can disrupt operation of the Global Positioning System (GPS) receivers, various kinds of technique to estimate the Direction-Of-Arrivals (DOAs) of incoming jamming signals have been widely studied, and among them, the MUltiple SIgnal Classification (MUSIC) algorithm is known to provide very high resolution. However, since the previous studies regarding the MUSIC algorithm does not consider the orientation of each antenna element of antenna arrays, there is a possibility that DOA estimation performance degrades in the case of a misaligned antenna array whose antenna elements are not oriented along the same direction. As an effort to solve this problem, there exists a previous work which presents an MUSIC-based method for DOA estimation. However, the error between the real and measured values of each antenna orientation is not taken into consideration. Therefore, in this paper, the effect of the aforementioned error on the DOA estimation performance in the case of a misaligned antenna array is analyzed by simulations.

• Journal of the Korean Institute of Telematics and Electronics S
• /
• v.35S no.3
• /
• pp.144-149
• /
• 1998

This paper presents a fast motion estimation algorithm, 5DS, useful for video coding. We first try block matching to 4 directions(N, E, W, S) to estimate motions in this algorith, since most of motions in video are oriented to those direction, and then try one additional diagonal matching between the matching ponts having small MADs. It makesthis algorithm possible for searching through a diagonal direction which is not adequate to logarithmic (LOG) search algorithm. This proposed algorithm has almost same PSNR but, 1.9, 1.2 times faster than classical block matching methods such as three steps search(TSS) and LOG search algorithms.

• Macromolecular Research
• /
• v.17 no.7
• /
• pp.506-515
• /
• 2009

We synthesized a series of polystyrene derivatives containing various side chain terminal moieties, such as phenoxymethyl, 4-methoxyphenoxymethyl, 4-fluorophenoxymethyl, 4-methylphenoxymethyl, and 4-trifluoromethoxyphenoxymethyl groups, using polymer analogous reactions, in order to investigate the effect of the side group on their liquid crystal (LC) alignment behaviors. The polymers containing 4-fluorophenoxymethyl, 4-methylphenoxymethyl, or 4-trifluoromethoxyphenoxymethyl side groups had lower surface energy values and the LC cells fabricated using the unrubbed films of these polymers showed homeotropic LC alignment behavior. The LC cells fabricated using the rubbed films of the polymers containing phenoxymethyl or 4-fluorophenoxymethyl groups showed homogeneous planar LC alignment behavior in which the LCs were aligned perpendicular to the rubbing direction. This homogeneous planar and perpendicular alignment behavior was ascribed to the favorable anisotropic interactions between the LC molecules and the side groups preferentially oriented perpendicular to the rubbing direction.

• Proceedings of the KIEE Conference
• /
• 2005.07b
• /
• pp.1023-1025
• /
• 2005

이방성 전기강판으로 제작되어진 전기기기의 보다 정확한 수치적인 해석을 위해서는 이방성 전기강판의 인가자계방향에 따른 정확한 자계특성 측정이 필요하다. 이 논문에서는 개발되어진 2방향 자계인가 형 싱글시트 테스터를 이용하여 이방성 전기강판의 인가자계방향에 따른 자계특성을 측정하였다. 실험을 통하여 방향성 전기강판의 rolling direction과 transverse direction에 대하여 각각 1.8[T]와 1.3[T]까지 측정할 수 있었다.

• Journal of Information Technology Services
• /
• v.7 no.4
• /
• pp.61-86
• /
• 2008

Korea 5MBA(Small and Medium Business Administration) is operating SMEs Policy Information System called SPi-1357 as a part of electronic government business, G4B. SPi-1357 system is offering tailor made policy information to a nation through on-off line system. In this paper, I provide the offering status of policy information, the status of SPi-1357 system, political results of SPi-1357 system, comparison with other country's policy information system, and the development direction of SPi-1357 system. Until now, most Policy Information Systems documents have focused on policy maker but the focus of this paper is functionally oriented SMEs.

• Journal of Korean Port Research
• /
• v.9 no.1
• /
• pp.1-17
• /
• 1995

According to the analysis results, first, the purpose of information system is usually internal-oriented (decrease of employees and increase of productivity) in the port-logistics industry. Second, the success factor of information system for internal strategy group is different for its external strategy group. Third, the external enviornment factors affect on the information strategy and the success factor in the port-logistics industry. Therefore, I think that it is necessary for the port-logistics industry to consider the information strategy direction and its affecting factors in the port-MIS.

• Journal of Engineering Education Research
• /
• v.26 no.3
• /
• pp.60-71
• /
• 2023

This study examined the direction that desirable educational direction of science and engineering graduate schools. In order to achieve the purpose, in-depth interviews were conducted with faculty, staffs and students of 'A' science and engineering research-oriented university. As a result of the study, first, independent researchers with international competitiveness, second, intellectuals who fulfill social responsibilities, convergent leaders across various boundaries of knowledge, and fourth, passionate people with a sense of challenge. Conclusions were made on enhancing the competitiveness of higher education and innovating graduate education in South Korea based on research findings.

• Tunnel and Underground Space
• /
• v.8 no.3
• /
• pp.226-233
• /
• 1998

Microcracks in rock materials, whether natural or induced, provide useful information on the engineering performance of in situ rockmasses. A population of preferentially oriented microcracks has observable effects on the physical properties of a rockmass, but their effects may not be evident if the rock material is highly anisotropic due to other causes. An experimental program was undertaken to investigate the effect of rock fabrics on the physical properties of rock materials. In this study, anisotropy in the circumferential wave velocity and the direction of induced fractures under axial point loading were measured. Rock specimens (NX-size) of the leucocractic Pocheon granite were cored from rock blocks, retaining the relative directions of each specimen. Another set of specimens was prepared from the rock cores of the same meterial, obtained in the field. The master orientation line (MOL) was set to be the representative direction of the microcracks in the specimen. Variation of the circumferential wave velocity of each specimen was then measured along the core, keeping the MOL as reference. The direction of the minimum wave velocity was nearly perpendicular to the direction of the MOL. Coring of smaller-sized (EX-size), concentric specimens from the NX specimens were then followed, and axial point loading was applied. The direction of induced fractures due to axial point loading was closely related to the MOL direction, confirming the prior test result.

• Korean Medical Education Review
• /
• v.19 no.3
• /
• pp.115-120
• /
• 2017

Despite the importance of how the premedical education curriculum is organized, the basic direction of the curriculum has not been evaluated at a fundamental level. In order to explore the basic directions of the premedical education curriculum, this study examined medical education as a university education, the historical basis of premedical education, and the direction of the premedical education curriculum. Historically, as medical education was incorporated into the university education system, premedical education developed based on basic science and liberal arts education. Accordingly, the direction of the premedical education curriculum began to split into two approaches: one believing in a basic science-based education intended to serve as the foundation of medical training, and the other believing in a liberal arts-based education intended to cultivate the qualities of a doctor. In recent years, however, the binary division in the direction of premedical education has ceased to exist, and the paradigm has now shifted to an agreement that premedical education must cultivate the basic scientific competence required for learning medical knowledge as well as the social qualities that a doctor should have, which are cultivated through the liberal arts. Furthermore, it has been asserted that the direction of premedical education should move toward the qualities that will be required in the future. With the fourth industrial revolution underway, the role of doctors is now being re-examined. This means that today's medical education must change in a future-oriented way, and the direction of the premedical education curriculum must be on the same page.