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Jeong, Hun,Nguyen, Dang Mao,Lee, Min Sang,Kim, Hong Gun,Ko, Sang Cheol,Kwac, Lee Ku Elsevier 2018 Materials science & engineering. C, Materials for Vol.90 No.-
<P><B>Abstract</B></P> <P>Herein, we successfully developed a novel three dimensional (3D) opened networks based on nitrogen doped graphene‑carbon nanotubes attaching with gold nanoparticles (N-GR-CNTs/AuNPs) to apply for non-enzymatic glucose determination. It was demonstrated that the N-GR-CNTs/AuNPs modified electrode exhibited good behavior for glucose detection with a long linear range of 2 μM to 19.6 mM, high sensitivity of 0.9824 μA·mM<SUP>−1</SUP>·cm<SUP>−2</SUP>, low detection limit of 500 nM, and negligible interference effect. The high performance of the N-GR-CNTs/AuNPs based sensor was assumed due to the outstanding catalytic activity of AuNPs well dispersing on N-GR-CNTs networks, which exhibited as a perfect supporting scaffold due to the enhanced electrical conductivity and large surface area. The obtained results indicated that the N-GR-CNTs/AuNPs hybrid is highly promising for sensitive and selective detection of glucose in sensor application.</P> <P><B>Highlights</B></P> <P> <UL> <LI> 3D network of N-GR-CNT-deposited Au NPs was synthesized for electrochemical sensor. </LI> <LI> The glucose was detected with linear detection range of 2 μM to 19.6 mM and low detection limit of 500 nM. </LI> <LI> The hybrid based sensor showed good stability and selectivity. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
The relationship between shift work pattern and thyroid stimulating hormone in female workers
Jeong Hun,Chae Chang Ho,Lee Jun Ho,Chong Hyo Won 대한직업환경의학회 2023 대한직업환경의학회지 Vol.35 No.1
Background: Shift work is known to cause changes in the circadian rhythm of the human body and adversely affect not only physical health but also mental health. Some studies have demonstrated the correlation between shift work and thyroid stimulating hormone (TSH), a hormone that changes according to the diurnal rhythm, but few studies have reported the different TSH levels according to the shift work type. This study aimed to investigate changes in TSH according to the shift work type. Methods: This study included 1,318 female workers who had a medical checkup at a university hospital in Changwon from 2015 to 2019. Shift work types were classified as nonshift work, regular 2 shifts, and irregular three shifts, and a TSH ≥ 4.2 mIU/L was defined as abnormal. A general linear model (GLM) was used to compare the TSH levels and the risk of subclinical hypothyroidism in each year, and a binary logistic analysis was performed using a generalized estimation equation (GEE) to compare the risk of subclinical hypothyroidism over the 5-year period. Results: Of the 1,318 participants included in this study, 363, 711, and 244 were non-shift, two-shift, and irregular three-shift workers, respectively. In the GEE analysis, after adjusting for age, body mass index, smoking, and alcohol consumption, the odds ratios (ORs) were 1.81 (95% confidence interval [CI]: 1.15–2.86; p = 0.011) in 2 shifts and 2.02 (95% CI: 1.23–3.32; p = 0.006) in irregular three shifts, compared to non-shift. Conclusions: Our results showed that shift work had a higher risk of subclinical hypothyroidism than non-shift work and that there was a significant difference in the risk of subclinical hypothyroidism according to the shift work type. These findings suggest that the shift work type can be considered in future thyroid function tests and evaluations.
YouTube 썸네일 이미지에 나타난 타이포그래피의 분산형, 집합형 표현유형에 따른 선호도 조사
선정훈 ( Sun¸ Jeong-hun ) 커뮤니케이션디자인학회 2021 커뮤니케이션 디자인학연구 Vol.77 No.-
인터넷과 디지털 기술의 발달은 개인이 직접 촬영부터 시작하여 컴퓨터의 프로그램과 핸드폰의 앱을 통해 간단한 영상 편집이 가능한 1인 미디어라는 개념을 탄생시켰다. 이러한 상황에서 YouTube는 전 세계적인 동영상 공유 플랫폼으로써 대표가 되고 있으며, 자연스럽게 콘텐츠 경쟁이 가열이 되고 있는 상황이다. 개인뿐만 아니라 많은 기업에서 자신의 콘텐츠를 돋보이게 하기 위해 다양한 장르의 동영상을 제작을 하고 있으며, 그 중 시청자와 구독자들이 자신이 콘텐츠를 볼 수 있게 하기 위해서 동영상의 대표 이미지인 썸네일 제작에 심혈을 기울이고 있다. 이제 본 연구는 YouTube에서 사용되는 썸네일, 그 중에서도 타이포그래피의 분산형, 집합형 표현유형을 중심으로 하여 시청자들의 선호도를 조사를 함으로써 개인 콘텐츠 제작자와 YouTube를 사용하여 홍보를 하고자 하는 기업 및 채널들에게 콘텐츠의 제작을 하는 데 있어 이로운 기초자료가 되는 것에 목적을 두고 있다. 본 연구에서는 시청자들과 기업들이 선호하고 홍보를 자주 하는 장르인 뷰티/패션과 요리/베이킹, 취미생활(리빙,토이)를 중심으로 조사를 하였으며, 조사를 위해 타이포그래피의 표현유형을 선정하고 분류작업을 하였다. YouTube 썸네일 이미지의 선호도를 조사한 결과 분산형보다 집합형 썸네일에 시청자들은 선호도가 높게 나타났으며, 그 중 메인 타이틀에 시선이 가장 집중이 된다는 것을 파악을 하였다. The development of digital technology and the Internet began with personal filming and went on to birth the concept of the one person media company, in which video editing is completed with computer programs and cell phone applications. Considering YouTube has become the worldwide leading video sharing platform in this digital climate, it is only natural that the competition in creating content has increased and continues to rise. Many companies are looking to elevate their content with various types of videos and have been focusing on the creation of video thumbnail images to help viewers and subscribers navigate the content more easily. By studying viewers’ preferences of loose and tight typography expression types in YouTube thumbnails, this study was conducted with the goal of providing foundational information for companies and channels that use content creators and YouTube for marketing purposes. This study focuses on the genres that viewers and companies tend to prefer and promote, including beauty/fashion, cooking/baking, and hobbies/life. In order to focus on these genres, the typography expression types were selected and categorized. Based on the research results on YouTube thumbnail image preferences, viewers highly preferred the tight expression type over the loose expression type and it was also concluded that they were most drawn to the main title.
고려시대 동남해지역 해양사와 중심 포구의 이동 - 조선 초기 부산포 개항과 관련하여 -
한정훈 ( Han¸ Jeong-hun ) 부산광역시사편찬위원회 2021 항도부산 Vol.42 No.-
본고는 조선 태종 7년(1407)에 내이포(乃而浦)와 함께 개항하는 부산포의 역사적 연원을 살펴보고자 작성하였다. 이를 위해 부산지역이 포함된 ‘동남해 해양사’의 관점에서 고려시대 동남해의 포구와 해양활동을 살펴보았다. 고려시대 동남해지역은 일본과의 외교와 통상활동의 중심 권역으로, 그 중심지는 남포(南浦)가 있던 김해와 합포(合浦)가 있던 마산지역이었다. 12~13세기 중반에는 객관(客館)과 동남해도부서(東南海都部署)가 있던 금주(金州)에서 대일 외교·통상 업무를 관할하였다. 13세기 후반의 원간섭기 이후는 왜구 침입의 방어 거점인 합포진변만호부가 있던 회원현(會原縣)이 동남해 수군 활동의 중심지가 되었다. 이 내용을 바탕으로 신라~조선 초기 동남해지역 중심 포구의 이동 양상을 살폈다. 신라의 대외 교섭은 울주 태화강변의 율포(栗浦)에서 이루어졌다. 또한 조선왕조 개창 이후 태종 7년에는 흥리왜인(興利倭人)을 위해 내이포와 부산포를 개항하였고, 16세기 중엽이 되면 부산포 단일 왜관시대가 열리게 되었다. 이상과 같이 신라~조선 초기 동남해지역의 중심 고을과 포구는 울주(율포), 금주(남포), 회원현(합포) 그리고 동래현(부산포)으로, 오늘날의 울산-김해-창원(옛마산)-부산 순으로 이동하였다. 이러한 동남해 해양사의 중심 포구의 이동 속에서 부산포의 개항을 이해할 필요가 있을 것이다. This study aims to investigate the historical background for the opening of Busan Port along with Naeipo in the 7<sup>th</sup> year of King Taejong’s reign (1407) during the Joseon Dynasty. For this purpose, this study examined the status of ports in the southeast coast and marine activities during the Goryeo Dynasty from the ‘sea history of the southeast coast’ perspective, including the Busan area. The southeast coast region during the Goryeo Dynasty was the central district for foreign policies and trading activities toward Japan, and the center was Gimhae where Nampo was located and Masan where Happo was located. To go back to the Silla Dynasty to examine the aspects of changes in the central ports in the southeast coastal region, foreign negotiation was made in Yulpo in the Taehwa riverside in Ulju. Next, in the first half and the middle period of the Goryo Dynasty, Geumju where the Southeast Sea and Islands Division and guest houses were located supervised foreign policies and trade affairs toward Japan. After the Yuan intervention period in the late 13<sup>th</sup> century, Hoewon-hyeon where the defensive work against Japanese invasion, Jinbyeon Manho-bu in Happo was located was the center base of naval forces’ activities in the southeast coast. Also, after the opening of the Joseon Dynasty, in the 7th year of King Taejong’s reign, Naeipo and Busan Port were opened for Heungri-woein (Japanese Traders), and in the mid-16th century, the single Waegwan period was opened in Busan Port. As above, between the Silla Dynasty and the early period of the Joseon Dynasty, the central counties and ports in the southeast coast region moved from Ulju (Yulpo) through Geumju (Nampo) and Hoewon-hyeon (Happo) to Dongnae-hyeon (Busanpo), respectively, Ulsan, Gimhae, Changwon (Former Masan) and Busan today. It is necessary to understand the opening of Busan Port in changes in the central ports in the southeast coast Sea history.
JeongHun Han(JeongHun Han) 한국학술연구원 2022 Korea Observer Vol.53 No.4
This study analyzes how individual motivations including political interest and media trust and cognitive abilities affect news consumption through YouTube in a high choice media environment of South Korea. In the empirical analysis, we use a nationally representative dataset differentiating respondents in tree types of users concerning YouTube - namely, non-users, non-news consumers, and news consumers. Applying a binary response model with sample selection, we resolve a potential selectin bias and prove that political interest is the strongest motivation leading individuals to consume news through YouTube. In addition, the positive impact of political interest is shown to increases as individuals trust less traditional news media. However, we do not find any evidence that news consumption through YouTube is biased toward a specific party or ideological orientation.
Motion-Compensated Interpolation for Non-moving Caption Region
Jeonghun Lee,Dongil Han 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
In this paper, we present a novel motioncompensated interpolation technique for non-moving caption region to prevent the block artifacts due to the failure of conventional block-based motion estimation algorithm on the block is consist of non-moving caption and moving object. Experimental results indicate good performance of the proposed scheme with significantly reduced block artifacts on image sequence that include nonmoving caption. Also the proposed method is simple and adequate for hardware implementation.