• 공학교육연구
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• 제15권4호
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• pp.31-34
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• 2012

This paper deals with the introduction of capstone design projects based on invention education in Department of Electronics and Communication Engineering, Korea Maritime University. This course is referred to as Creative Engineering Design for spring semester of 4th-year undergraduates. The course focuses on creative thinking and cooperative mind to students by learning engineering design skills, realizing their idea through design project and recognizing practicality of their systems. To improve creative thinking of students, intellectual property (IP) education is very helpful. If engineering students take training program in IP, it will be very beneficial for CEOs to manage intellectual capital in many industries and to ensure competition power in their business. This study suggested that students take interest in connecting their ideas with inventions through invention education reinforcing an invention and a patent exercise. It is expected that this study may help to develop new curriculum of capstone design project including IP education in many universities.

• 공학교육연구
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• 제9권2호
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• pp.71-81
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• 2006

2년제 대학의 전자 및 정보통신 관련 학과에서 전자분야의 생산 공정 관리를 담당하는 테크니션을 양성하기 위한 교과과정 개발을 위해서는 생산 공정 관리자의 직무를 체계적으로 분석하고 정의하며, 관련기술과 도구에 대한 기술이 필요하다. 이 연구에서는 생산 공정 관리를 담당하는 중간관리자가 갖추어야 할 직무능력과 관련하여 3가지 직무에 대해서 22가지의 테스크를 정의하고, 이를 6가지 교과로 분류하고 이들 교과에서 교육할 내용을 12가지 주제로 정리하였다. 이를 통해서 전자관련 분야의 생산 공정 관리를 위한 중간관리자를 효율적으로 교육할 수 있는 교과과정 모형을 제시하였다.

• International Journal of Internet, Broadcasting and Communication
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• 제11권3호
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• pp.27-33
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• 2019

Quadrature spatial modulation (QSM) utilizes the in-phase and quadrature spatial dimensions to transmit the real and imaginary parts, respectively, of a single signal symbol. Improved QSM (IQSM) builds upon QSM to increase the spectral efficiency by transmitting the real and imaginary parts of two signal symbols using antenna combinations of size of two. In this paper, we propose a double QSM (DQSM) scheme that transmits the real and imaginary parts of two signal symbols independently through any of the transmit antennas. The two signal symbols are drawn from two different constellations of the same size with the first symbol drawn from any of the conventional modulation sets while the second is drawn from an optimally rotated version of the first constellation. The optimum rotation angle is obtained through extensive Monte Carlo simulations to minimize the bit error rate (BER) of the system. Simulation results show that for a given spectral efficiency, DQSM performsrelatively close to IQSM while requiring a smaller number of transmit antennas, and outperformsIQSM by up to 2 dB when the same number of antennas are used.

• International Journal of Internet, Broadcasting and Communication
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• 제11권3호
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• pp.34-40
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• 2019

In spatial modulation (SM), both the signal symbol and spatial symbol, i.e., the index of the antenna from which signal symbol is transmitted, carry information. To increase the number of bits carried by spatial symbols, more transmit antennas are required. In the generalized SM (GSM), the same signal symbol is transmitted from a combination of antennas, resulting in a reduction in the number of antennas required to achieve a given spectral efficiency. In this paper, we propose a rotated-symbol GSM (RGSM), in which the signal symbol is rotated with an angle corresponding to the position of the antenna index within the combination. This increases the number of spatial symbols by a factor equivalent to the length of the antenna combinations of the GSM. Numerically, SM, GSM and RGSM require 128, 17 and 12 transmit antennas to convey seven bits through the spatial symbols. Simulation results show that RGSM performs relatively close to GSM, and in several system settings, their error performances coincide.

• 반도체디스플레이기술학회지
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• 제14권1호
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• pp.61-65
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• 2015

We have fabricated poly(3,4-ethylenedioxythiophene) : poly(4-styrenesulfonate) (PEDOT : PSS) thin films using a slotdie coater for the applications of OLED lightings. It is demonstrated that the properties of slot-die coated PEDOT : PSS films are comparable with those of spin-coated ones. Namely, the average and peak-to-peak roughness of the slot-die coated 50-nm-thick PEDOT : PSS film are measured to be as low as 0.247 nm and 1.3 nm, respectively. Moreover, we have obtained excellent thickness uniformity (~1.91%). With the slot-die coated PEDOT : PSS films, we have fabricated green phosphorescent OLED devices. For comparison, we have also fabricated OLED devices with spin-coated PEDOT : PSS films. Both show almost no discrepancy in device performance. The power efficiency (25.4 lm/W) and emission uniformity (77%) of OLEDs with slot-die coated PEDOT : PSS films are shown to be slightly lower than those (27.3 lm/W, 80%) of OLEDs with spin-coated PEDOT : PSS films at the luminance of 1,000nit, increasing the feasibility of using a slot-die coating process for the fabrication of large-area OLED lighting sources at a competitive price.

• 반도체디스플레이기술학회지
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• 제13권3호
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• pp.27-33
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• 2014

To develop high efficiency crystalline solar cells, the $SiN_x$ film for surface passivation and anti-reflection coating is very important and it is generally deposited by PECVD. In this paper, the $SiN_x$ film deposited by Hot-Wire chemical vapor deposition(HWCVD) that has no plasma damage was studied. First, to optimize the $SiN_x$ film deposition process, $SiH_4$ gas rate and substrate temperature were varied and then refractive index and thickness were measured. When $SiH_4$ gas rate was 22sccm and substrate temperature was $100^{\circ}C$, refractive index was 1.94 and higher than that of other process conditions. Second, the lifetime was measured by varying the annealing temperature and time. The annealing process was made from 5 to 30 minutes at $300{\sim}500^{\circ}C$. When the annealing temperature was $100^{\circ}C$ and time was 10minute, the lifetime was the highest. The lifetime of annealed samples was also measured after the firing process at $975^{\circ}C$. Although the lifetime of all samples was decreased by firing process, the lifetime of annealed samples before the firing process was higher than that of fired samples only. Finally, the characteristics of solar cells with HWCVD $SiN_x$ film were measured.

• 반도체디스플레이기술학회지
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• 제15권1호
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• pp.65-69
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• 2016

We have investigated the possibility of recycling of an organic material that is wasted during thermal evaporation. To this end, we have collected a wasted organic material (N,N'-diphenly-N,N'-bis(1,1'-biphenyl)-4,4'-diamine(NPB)) from a vacuum chamber, purified it by recrystallization, and fabricated bilayer organic light-emitting diodes (OLEDs) with the recycled NPB. It is found that the surface roughness of thin films coated with the purified NPB is much enhanced. OLEDs fabricated by thermal evaporation of the purified NPB show lower device efficiency than OLEDs with the original NPB. However, the power efficiency of OLED fabricated by spin coating of the purified NPB is comparable with that of OLED with the original NPB. Therefore, such a recycling method by recrystallization would be more suitable for solution-processed OLEDs.

• 공학교육연구
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• 제17권2호
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• pp.42-49
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• 2014

This study analyzed and compared the curriculum of 12 arbitrarily selected Colleges of Engineering for their professional general education. Since the Korean Accreditation of Engineering Education has existed for the last 10 years a growing need for improvements was identified and thus this study shall provide a basis for future curriculum developments of the professional general education. For this purpose the educational objectives, the syllabus, the self-assessment reports and catalogues of the 12 Colleges were reviewed and the relevance between the educational objectives of each engineering school and the learning outcomes in the professional general education were analyzed. Furthermore, by analyzing the area of subject that each College of Engineering's mechanical engineering program's professional general education focuses on, the current trend can be examined. Finally, the credit requirements and their allocation and the distribution of the professional general education over the semesters were analyzed. The results of this study were as followed; these capabilities such as creativity, professionalism, globalization, ethics, humanism, design ability, management ability, responsibility and communication are suggested as educational objectives of 12 engineering schools. But courses related to globalization, ethics & responsibility and communication skills were much more often taught. Not only do the allocated credits for the courses of professional general education differ from university to university but the distribution over the semesters vary as well.

• 공학교육연구
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• 제13권6호
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• pp.3-13
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• 2010

본 연구의 목적은 공과대학생의 학습양식 유형을 분석하고, 학습양식에 따른 의사소통 불안 수준의 차이를 검증하는 것이다. K대학교에 재학 중인 공과대학 1학년생 405명을 대상으로 학습양식을 분석한 결과, 감각적 학습자는 61%, 시각적 학습자는 73.1%, 숙고하는 학습자는 80%, 총체적 학습자는 66.7%로서 우세한 비율을 차지하는 나타났다. 성별에 따른 학습양식의 차이에서는 정보처리 차원에서 유의한 차이를 보였으며, 여자가 남자보다 숙고하는 학습양식을 선호하는 것으로 나타났다. 학습양식에 따른 의사소통 불안 수준의 차이를 분석한 결과, 정보지각과 정보처리 차원에서 유의한 차이를 보였다. 감각적 학습자가 직관적 학습자보다, 숙고하는 학습자가 적극적 학습자보다 더 높은 수준의 의사소통 불안을 느끼는 것으로 나타났다. 연구결과에 기초하여 의사소통 교육 프로그램을 실행할 때, 학습자의 학습양식을 고려하여 의사소통 불안 수준을 최소화할 수 있는 전략에 대한 시사점을 제안하였다.

• 공학교육연구
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• 제15권1호
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• pp.35-44
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• 2012

This paper analyzes characteristics and discourses related with the risk communication of Fukushima nuclear disaster. I try to pick up and analyze the three strategies of Korean government's and expert system's risk communication, and then understand the relationship between them and the role of expert system in the risk communication and the politics of expertise.