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      • KCI등재

        모바일 콘텐츠 간 경쟁관계 분석: 콘텐츠 소비 맥락을 중심으로

        김민성(Min Sung Kim),김성철(Seongcheol Kim),김형지(Hyoung-Jee Kim),김정환(Junghwan Kim) 한국디지털콘텐츠학회 2022 한국디지털콘텐츠학회논문지 Vol.23 No.3

        This paper examines the competition among contents consumed through mobile devices. Considering that mobile content use is most active in the ‘on the move’ and ‘before bed’ situations, a niche analysis was conducted between news, video, and webtoon contents in the two situations. For both situations, three types of gratifications, namely entertainment, interaction, and information, were identified using factor analysis. The following are the results of niche breadth, niche overlap, and competitive superiority analysis. It was found that video satisfies various dimensions of gratifications while on the move. In the before bed situation, the niche breadth values of news content were generally high. For competitive superiority, news was in a high position over video and webtoon in terms of information. In terms of entertainment, video was superior to other content. Lastly, users were using contents as supplements by consuming content that suits their purpose and situation.

      • Microfluidic Microplastics Trap Module for Detection by Fluorescent Staining

        Seongcheol SHIN,Hyun Ho LEE,Seungju OH,Hyeyeon HUR,Jongmin YANG,Dhanashiri DESAI,Gillhwan KIM,Chorong KIM 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10

        Microplastics has a negative impact on marine ecosystems and humans. In this study, we developed microfluidic devices as microplastics trap modules using polydimethylsiloxane (PDMS) using photolithography or laser ablation. For a generation of turbulent flow to separate microplastics, several grooves were pattered inside the microfluidic channel. It proves that grooved channel is an efficient platform to trap the microplastics by recirculation. Finally, the microfluid trap module could be connected with PDMS mixer module to selectively stain the trapped microplastics my fluorescent dye.

      • KCI등재

        A Study on the Effective Half-life after the High Dose Radioactive Iodine (131 I) Therapy for Thyroid Cancer Patients

        Seongcheol Kim(김성철),DaYeong Gwon(권다영),Yongmin Kim(김용민) 한국방사선학회 2017 한국방사선학회 논문지 Vol.11 No.7

        고용량 131 I 치료는 분화갑상선암으로 인한 갑상선전절제술을 받은 환자에게 보편적으로 시행되어 왔다. 고용량 131 I 치료를 하는 경우 환자로부터 일반인이 받게 되는 피폭선량을 선량한도 이내로 제한하기 위해 환자를 일정 기간 동안 격리하여야 한다. 유효반감기는 환자로부터 가족들이 얼마나 피폭되는지 계산하거나 격리기간을 결정하는데 중요한 값이다. 이에 본 연구에서는 NM670 SPECT/CT를 이용해 고용량 13 1I 치료환자의 유효붕괴상수, 유효반감기, 격리기간을 도출하였다. 본 연구를 통해 고용량 131 I 치료환자의 유효반감기를 도출하였고, 체내에 잔류 방사능량이 퇴원기준인 1.2 GBq 에 도달하는 시간을 확인하였다. 또한 치료선량별 유효반감기를 비교하였을 때 유의한 차이가 없었으나, 격리기간은 치료선량이 커질수록 격리기간이 길어지는 것을 확인할 수 있었다. 전처치 유형별 유효반감기를 비교하였을 때 rhTSH 환자군과 THW 환자군의 유효반감기가 유의한 차이를 보이지 않았으나, 격리기간은 rhTSH 환자군이 THW 환자군 보다 짧게 나타났다. 이는 치료선량의 차이로 인해 격리기간이 짧아진 것으로 판단된다. 따라서 현행 의료보험체계(rhTSH 사용 시 3.7 GBq 이하에서 보험적용)가 유지된다면, 전처치 유형별로 구분하여 현행 격리기간(2박 3일)보다 더 이른 시간에 환자를 퇴원시킬 수 있을 것이다. High-dose 131 I therapy has been generally carried out to remove remaining thyroid tissue or to cure metastasize lesion of patients who received full thyroidectomy due to differentiated thyroid cancers. In case high-dose 131 I therapy is carried out for a patient, the patient should be hospitalized being isolated for a certain period in order to restrict the amount of exposure to radiation of people at large from the patient within the limit of a level of radiation. Effective half-life is an important value to calculate how family members are exposed to radiation from a patient or to decide the period of isolation of the patient from the family members. Therefore, in this study we calculated the effective decay constant, effective half-life and period of isolation of high-dose 131 I therapy patient using NM670 SPECT/CT. As a result of carrying out this study, the effective half-life of high-dose 131 I therapy patients was derived and the time to reach the discharge level of 1.2 GBq was confirmed. When they were compared with each other in each of curative doses, the effective half-life did not have significant difference, but the time when the level of radiation remaining in the interior of the body to reach the criteria of isolation and discharge showed significant difference and it could be confirmed that the higher the curative dose the longer the period of isolation becomes. When the effective half-lives in each type of preparation were compared with each other, they did not show significant difference. However, When the times to reach the level of radiation that is the criteria of isolation and discharge in each type of preparations, they showed significant difference. The cause of the shortening of the isolation period for rhTSH patients group is decided to be low curative dose. Accordingly, if the current national health insurance (the insurance is applied to using of rhTSH in 3.7 GBq or lower) is maintained, while discerning them in each of types of preparation, we would be able to discharge patients at the time earlier than the current period of isolation (2 nights and 3 days).

      • SCOPUS

        Newspaper journalists’ attitudes towards robot journalism

        Kim, Daewon,Kim, Seongcheol PERGAMON PRESS 2018 TELEMATICS AND INFORMATICS Vol.35 No.2

        <P><B>Abstract</B></P> <P>This study identifies the attitudes of three types of newspaper journalists towards robot journalism by employing Q-methodology. The samples analyzed in this study are 47 journalists from 17 South Korean newspapers. The first type believes that journalism is beyond robots’ capabilities, a position terms “journalism’s elitism.” The second type demonstrates the “Frankenstein complex,” meaning greater concern about the introduction of robots based on dismal scenarios. The last type has a relatively rosy view, which focuses on a positive blueprint despite recognition of some threats.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Newspaper journalists’ attitudes towards robot journalism are tracked. </LI> <LI> Their attitudes are categorized with three types. </LI> <LI> They have the negative feeling that robots are likely to damage journalism’s value. </LI> <LI> They are concerned about decline in their status in their organization and society. </LI> </UL> </P>

      • Enhancement of negative hydrogen ion production at low pressure by controlling the electron kinetics property with transverse magnetic field

        Kim, June Young,Cho, Won-Hwi,Dang, Jeong-Jeung,Kim, Seongcheol,Chung, Kyoung-Jae,Hwang, Y S IOP 2016 Plasma sources science & technology Vol.25 No.6

        <P>In a volume production H<SUP>−</SUP> ion source, independent control of electron energy distribution between the driver region and the extraction region is crucial for the efficient production of H<SUP>−</SUP> ions due to its unique volume production mechanism. However, at the low pressure regime compatible to ITER operation, it is difficult to control electron energy distribution separately because the nonlocal property dominates the electron kinetics. In this work, we suggest a new method to control the locality of electron kinetics. In this method, an additional pair of permanent magnets is introduced in the vicinity of the skin layer, differently from the conventional method in which the magnetic filter field was strengthened in the extraction region. This magnetic field shortens the energy relaxation length and changes the electron kinetics from nonlocal to local even for low pressure discharges. In this paper, we show that the locality of electron kinetics can be effectively controlled by the additional magnetic field near the skin layer by measuring the electron temperature profile along the center of the discharge chamber as well as by comparing electron energy probability function shapes for different strengths of magnetic field. Using this new method, we demonstrate that control of locality of electron kinetics can greatly enhance the production of H<SUP>−</SUP> ions in the extraction region by measuring H<SUP>−</SUP> ion beam current extracted from the plasma source.</P>

      • An institutional analysis of environmental management in the Korean mobile communications industry

        Kim, Dokyung,Kim, Seongcheol Elsevier 2019 TelecommunicationsPolicy Vol.43 No.10

        <P><B>Abstract</B></P> <P>Environmental sustainability in the mobile communications industry can affect corporations not only in the sector but also in other industries by providing solutions to cope with environmental issues. However, despite the significance of environmental sustainability in the industry, there has been a lack of academic attention. This study investigated the environmental issues in the mobile communications industry by adopting an integrated and holistic approach to corporate sustainable management. In addition, the environmental management of mobile network operators was analyzed using the framework of institutional theory. To investigate the environmental management of mobile network operators, we carried out a case study on three Korean mobile network operators including SK Telecom, KT, and LG Uplus. The results demonstrated that economic and environmental issues were mostly found in the mobile communications industry, and the mobile network operators have actively coped with these issues. Their environmental management was relatively active, and regulatory, mimetic and normative mechanisms were working simultaneously. This study provides some meaningful implications for practitioners and policymakers.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Environmental sustainability in the mobile communications industry is very significant. </LI> <LI> This study investigated the environmental issues in the mobile communications industry. </LI> <LI> A case study on three Korean mobile network operators was carried out. </LI> <LI> Their environmental management was relatively active. </LI> <LI> Regulatory, mimetic and normative mechanisms were working simultaneously. </LI> </UL> </P>

      • User preference for an IoT healthcare application for lifestyle disease management

        Kim, Suwon,Kim, Seongcheol Elsevier 2018 TelecommunicationsPolicy Vol.42 No.4

        <P><B>Abstract</B></P> <P>The current convergence between information and communications technology (ICT) and medical fields reflects a shared vision of seamlessly connected sensors and devices that can improve healthcare services, and an expectation of the emergence of Internet of Things (IoT) healthcare. This study provides a relevant guide for IoT healthcare service developers, from the perspective of the technology user. Particularly, we propose critical factors that will potentially influence users’ acceptance of an IoT lifestyle disease management service. Information on the profession of service providers, task scope, devices, expert support, and a range of shared personal medical data were suggested as important attributes. Conjoint analysis was adopted to estimate the relative importance of proposed attributes and preferences for service specifications. Data and medical history were collected from 435 respondents. The model was analyzed and compared between the groups with different medical histories, respectively. The results showed that potential users, in general, require a safe and trustworthy healthcare service, rather than greater functionality, while medical history has a considerable influence on the perceived importance of the proposed attributes.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A conjoint model for user acceptance of IoT healthcare application was proposed. </LI> <LI> Patients and nonpatients showed remarkable differences in relative importance. </LI> <LI> Factors related to trust and reliability were more critical than functionality. </LI> <LI> Greater functionality of IoT healthcare would not guarantee user acceptance. </LI> <LI> Users’ perception for medical data openness and safeness needs to be improved. </LI> </UL> </P>

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