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이학준 ( Lee¸ Hakjun ),우정한 ( Woo¸ Jeonghan ) 대구대학교 한국특수교육문제연구소 2021 특수교육저널 : 이론과 실천 Vol.22 No.3
[목적] 이 연구의 목적은 특수교육에서 코로나19 연구현황을 분석하는 것이다. [방법] 이를 위하여 국내 특수교육에서 진행된 코로나19 학술지 논문 17편을 분석하였다. [결과] 그 결과는 다음과 같다. 특수교육에서 코로나19는 비대면, 비접촉, 사회적 거리 두기라는 특성을 보여주었다. 첫째, 연구 대상은 특수교사와 장애 학생이 많았다. 둘째, 연구주제는 장애학생과 특수교사의 온라인수업 경험에 관한 연구가 다수를 차지하였고 그 외는 인식 및 실태, 시사점 순이다. 셋째, 연구 방법은 질적연구가 다른 연구 방법보다 많았다. 향후 연구과제는 온라인수업 인식 및 실태, 보편적 학습설계 기반 수업, 정책적 지원 등이다. [결론] 특수교육에서 코로나19 연구현황 분석은 특수교육에서 해결해야 할 우선순위를 결정하는데 기초자료가 된다. 현재 특수교육 분야에서 절실한 고민은 코로나19 상황에서의 특수교육대상자에 대한 효과적인 수업일 것이다. 그 방법은 교사와 학생 그리고 학부모 등 모든 구성원이 함께 해결해야 할 과제라고 할 수 있다. [Purpose] The purpose of this study was to review the current status of research on special education during the COVID-19 pandemic in Korea. [Method] The research method was a quantitative research method. [Result] During the COVID-19 pandemic in Korea, special education had characteristics of non-face-to-face, non-contact, and social distancing. Most of the studies are related to online classes, while others are related to a variety of different topics. [Conclusion] The results of this study suggest that pending issues of special education should be prioritized during the COVID-19 pandemic. The most urgent task is to ensure effective classes for all special education students during the pandemic. This is a problem that all relevant parties, including teachers, students, and parents, must solve together.
Hakjun Eom,Youngae Jung 한국디지털콘텐츠학회 2020 The Journal of Contents Computing Vol.2 No.2
This research analyzes the strategy of transmedia storytelling by comparing the domestic success storytelling of YLab"s webtoon series Superstring with Marvel Cinematic Universe. Superstring series is announced officially in December 2015, and it has been a great achievement despite a shorter period of time than Marvel relatively. Since the Superstring project has been developed with Marvel Cinematic Universe as a role model, it is meaningful to compare the strategies of the two projects. This study proposes developmental strategies of Korean transmedia and the possibility of combining them with intellectual property industries based on the results compared and analyzed representative transmedia cases.
Hakjune Lee,Duk-Jae Woo,Sangwook Nam IEEE 2016 IEEE antennas and wireless propagation letters Vol.15 No.-
<P>A novel compact and broadband asymmetric coplanar wave guide (ACPW) antenna is presented. A method to extend the bandwidth of a metamaterial-inspired antenna based on a composite right/left-handed transmission line (CRLH-TL) and a modified ground plane is proposed. The ACPW antenna has a broadband characteristic by placing the zeroth-order resonance (ZOR), first-positive-order resonance (FPOR) of short-ended CRLH-TL and the modified ground plane's two resonances, which are half and one lambda resonances, at all different frequencies with proper frequency intervals. The prototype of the proposed antenna has been implemented and measured. The measured -10-dB fractional bandwidth is 109.1% (from 2.69 to 9.15 GHz) with high efficiency of over 65% and a low profile of 0.32 lambda(0) x 0.19 lambda(0) (where lambda(0) is the free-space wavelength at the first resonant frequency).</P>
Hakjun Lee,Jinsuk Choi,Wookyong Kwon 제어로봇시스템학회 2022 제어로봇시스템학회 국제학술대회 논문집 Vol.2022 No.11
While operating a mobile manipulator on uneven terrain, the manipulator experiences severe degradation in control performance owing to an unexpected motion. To resolve this problem, this paper proposes an effective composite control scheme for the mobile manipulator with a robust control scheme and an inertial measurement unit (IMU) sensor. First, the IMU sensor is used to estimate the tilt angle of the robot and compensate for the effects of these rotational movements on the end-effector. In addition, we employ a robust control based on a time delay-control with a disturbance observer to compensate for model uncertainty and exogenous disturbance caused by uneven terrain. It is demonstrated through a simulation that the proposed control scheme compensates well for the effect of the uneven terrain on the mobile manipulator.
Cylindrical Tightly Coupled Dipole Array Antenna
Hakjune Lee,Minyoung Yoon,Sangwook Nam 한국전자파학회JEES 2019 Journal of Electromagnetic Engineering and Science Vol.19 No.2
A cylindrical tightly coupled dipole array antenna (C-TCDA) based on Munk’s planar TCDA theory, the elements of which are placed on the surface of a cylinder, is introduced and analyzed in this study. The explicit field components of the transverse electromagnetic (TEM) waves existing in the C-TCDA for both polarizations are given. Moreover, the embedding impedance characteristics of the CTCDA are presented and compared with those of planar TCDA. Analysis results show that the C-TCDA has similar impedance characteristics to the planar TCDA and thus can be implemented in a similar manner. The design of a dual-polarized omnidirectional octagonal TCDA, which has a 3.08:1 bandwidth (from 0.73 ㎓ to 2.25 ㎓) with a voltage standing wave radiation (VSWR) of less than 2 and a low gain variation of less than 1.8 ㏈ at broadside for both polarizations, is also proposed. When scanning up to ±30° in the θ-direction, the array operates in the same frequency band with a VSWR of less than 2.05 and a low gain variation of less than 2 ㏈ for both polarizations.
HakJun Song,Jungsun Kim,Choong-Ki Lee 한국호텔외식관광경영학회 2015 한국호텔외식경영학회 학술발표논문집 Vol.- No.-
Corporate social responsibility (CSR) has considered as a decisive philosophy and an approach that influences not only employees’ attitude but also customers’ attitude. However, it seems that the influence of CSR can be more specified from the perspective of casino visitors by additionally considering compulsory and supplementary responsible gambling (RG) strategies. To this end, current study conducts a survey of casino visitors in South Korea and identifies relationships among their perceptions of CSR and RG strategy, customer trust, and behavioral intention. The results of this research reveal that ethical, philanthropic, and economic CSR have positive effects on customer trust, whereas compulsory RG and philanthropic CSR directly affect behavioral intention. Furthermore, it appears that trust positively influences behavioral intention. Based on these findings, current research offers practical implications when implementing CSR and RG strategies for casino visitors.
A Dual-Polarized 1-D Tightly Coupled Dipole Array Antenna
Hakjune Lee,Sangwook Nam Institute of Electrical and Electronics Engineers 2017 IEEE transactions on antennas and propagation Vol.65 No.9
<P>A dual-polarized 1-D tightly coupled dipole array (TCDA) antenna is proposed in this paper. To apply the TCDA design concept to a 1-D array, we place a conducting wall with slits and ferrite sheets along the 1-D dipole array. The simulated dual-polarized 1-D infinite TCDA antenna has a wide overlapped bandwidth of 2.83:1 (from 1 to 2.83 GHz) with VSWR < 2, high isolation (> 25 dB) between the horizontal and vertical polarizations (VPs), and low height of 1/5 lambda at the lowest operating frequency. A prototype of the proposed array is fabricated and measured, which consists of nine horizontal polarization (HP) dipoles and eight VP dipoles interleaved between the HP dipoles. The measured results show high gains > 7.2 dB when scanning up to 30 degrees and a wide half-power beamwidth in the yz plane > 61 degrees over the operating frequency band for both polarizations, consistent with the simulation result.</P>