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

[P2-44] Mercury Contents in Kimchi and Pickle Products

Sungim Im,Jinwook Jang,Kwangsoo Lee,Seongcheol Kim,Kyunga An,Ryunkyung Lee,Hyuna Kim,Miok Kim,Jeongmin Kim,Miwha Parka,Yong seok Ko,Sohee Kim,Daebyeong Kim 한국식품영양과학회 2007 한국식품영양과학회 학술대회발표집 Vol.2007 No.10

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>

Characterization of Microfluidics Trap and Mixer Platform for Efficient Fluorescent Tagging of Microplastics

Seongcheol SHIN,Hyun Ho LEE,Dhanashri DESAI,Gillhwan KIM,Cholong KIM 한국생물공학회 2022 한국생물공학회 학술대회 Vol.2022 No.4

How the Korean Online Gaming Industry Has Evolved: An Institutional Analysis

Seongcheol Kim,Jiwhan Kim 한국정보사회학회 2011 정보사회와 미디어 Vol.- No.20

Thermal inflation, baryogenesis and axions

Kim, Seongcheol,Park, Wan-Il,Stewart, Ewan D. IOP Publishing Ltd 2009 Journal of high energy physics Vol.2009 No.1

In a previous paper, we proposed a simple extension of the Minimal Supersymmetric Standard Model which gives rise to thermal inflation and baryogenesis in a natural and remarkably consistent way. In this paper, we consider the λ<SUB>φ</SUB> = 0 special case of our model, which is the minimal way to incorporate a Peccei-Quinn symmetry. The axino/flatino becomes the lightest supersymmetric particle with <I>m</I><SUB>ã</SUB> ∼ 1 to 10 GeV and is typically over-produced during the flaton decay. Interestingly though, the dark matter abundance is minimized for <I>m</I><SUB>ã</SUB> ∼ 1 GeV, <I>f</I><SUB><I>a</I></SUB> ∼ 10<SUP>11</SUP> to 10<SUP>12</SUP> GeV and |μ| ∼ 400 GeV to 2 TeV at an abundance coincident with the observed abundance and with significant amounts of both axions and axinos. Futhermore, for these values the baryon abundance naturally matches the observed abundance.

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.

Development of diverted plasma discharge and plan for advanced divertor study in VEST

Kim, SeongCheol,Lee, Jeongwon,Yang, Jeong-hun,Chung, K.S.,Chung, Kyoung-Jae,Na, Yong-Su,Hwang, Y.S. Elsevier 2017 Fusion engineering and design Vol.123 No.-

<P><B>Abstract</B></P> <P>Operational scenario for diverted plasmas has been developed in Versatile Experiment Spherical Torus (VEST) not only for improving plasma performance but also for preparing upcoming experiments on advanced divertor concepts such as snowflake and x-point divertor. Diverted discharge scenario is designed using an in-house simulation code and experimentally realized by adjusting turn-on time of two partial solenoid (PF2) coils located at both ends of the center stack. With the diverted scenario, we achieve the improvement in plasma duration by ∼20% compared to the limited plasma operation, mainly due to the mitigation of impurity influxes from the center stack made of tungsten. Indeed, the impurity O-I line is observed to be decreased to 50% of the limited plasma operation. Fast camera images and equilibrium reconstruction based on magnetic diagnostics clearly shows the successful generation of diverted plasmas as well. This paper presents the first results on the diverted plasma operation in VEST and future plan for the experiments on the advanced divertor concept.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Diverted plasma is generated using the partial solenoid coils in VEST. </LI> <LI> Characteristics of the diverted plasma discharge are evaluated with various diagnostics. </LI> <LI> An advanced divertor concept is presented in this paper. </LI> </UL> </P>

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).

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>