핵주기 공정에서의 이온성 액체 활용 기술 개요

김기섭,박병흥,Kim, Ki-Sub,Park, Byung Heung 한국교통대학교 융복합기술연구소 2013 융ㆍ복합기술연구소 논문집 Vol.3 No.2

The ionic liquids are known to potential alternative solvents capable of replacing the commercial solvents in various processes including those in nuclear fuel cycle. As to the material, a number of studies have already reviewed the interesting results and addressed the spectroscopic as well as electrochemical behaviors of metal elements included in spent nuclear fuels. It has found that the important properties of metal ions in TBP dissolved ILs have led the development of alternative technologies to traditional solvent extraction processes. On the other hand, the electrochemical deposition of metal ions in ILs have been investigated for the application of the solvents to aqueous as well as to non-aqueous processes. In this work, a review on the application of ILs in nuclear fuel cycle is briefly presented to understand the notable researches on ILs focusing on aqueous processes.

SI 수소생산 공정 Section 3 열교환기 설계

김기섭,박병흥,Kim, Ki-Sub,Park, Byung Heung 한국교통대학교 융복합기술연구소 2017 융ㆍ복합기술연구소 논문집 Vol.7 No.1

SI process is one of the most advanced thermochemical water splitting cycles enabling mass production of hydrogen without emitting carbon dioxide when coupled to nuclear heat energy. The highest temperature (close to $1000^{\circ}C$) required in SI process is well matched with the outlet temperature of a coolant circulating a high-temperature gas-cooled reactor at around $950^{\circ}C$. In Section 3, some heat exchangers are included to recover heats from process flows at high temperature. In this work, we designed a heat exchanger based on the $1Nm^3/hr$ $H_2$ production capacity using commercial tools for chemical process design.

Hydrophilic and Hydrophobic Ionic Liquids as Gas Hydrate Inhibitors

Soyeong Yun(윤소영),Dongyoung Lee(이동영),Woojin Go(고우진),Ki-Sub Kim(김기섭),Yongwon Seo(서용원) 한국신재생에너지학회 2021 한국신재생에너지학회 학술대회논문집 Vol.2021 No.7

Gas hydrate inhibitors have been generally used to avoid pipeline plugging risks cause by gas hydrate formation in gas and oil field operations. Ionic liquids (ILs) can act as both a thermodynamic hydrate inhibitor (THI) and a kinetic hydrate inhibitor (KHI) and therefore, they are called ‘dual’ function inhibitors. In this study, we focused on the hydrophobicity of ILs and examined the inhibition effect of ILs on the kinetics and thermodynamic stability of CH₄ hydrate by measuring the onset temperature (Tonset) and hydrate phase equilibria. Total 8 ionic pairs (2 cations ([EMIM]+ and [BMIM]+) � 4 anions ([CI]-, [BF₄]-, [PF₆]-, and [Tf₂N]-)), which have the following hydrophobicity order : [EMIM]+ 〈[BMIM]+ for cation and [CI]- 〈[BF₄]- 〈[PF₆]- 〈[Tf₂N]- for anion, were investigated. Moreover, molecular dynamics (MD) simulations were used to figure out the molecular behaviors of ILs for hydrate inhibition by examining radial distribution function (RDF), density profile, and order parameter analysis. Hydrogen bonding ability of anions with water molecules and cage adsorption of cations were found to be the major pathways of preventing and retarding the formation and growth of CH₄ hydrate. Our research will provide a better understanding of the inhibition mechanism of various hydrophilic and hydrophobic ILs on CH₄ hydrate formation.

8K UHD 영상 획득에 관한 연구

김기섭(Ki Sub Kim),박광훈(Gwang Hoon Park),최해철(Hae Chul Choi),최진수(Jin Soo Choi) 한국방송·미디어공학회 2009 한국방송공학회 학술발표대회 논문집 Vol.2009 No.11

최근 MPEG에서 HD(High Definition) 해상도 이상의 초고해상도 비디오를 위한 HVC(High-performance Video Coding) 표준화에 대하여 논의가 되고 있다. 이런 흐름 속에서 ETRI에서 보유중인 베리어 방식의 CCD를 사용하여 NHK에서 제작된 RG1G2B 4K 영상은 dark current error, bias error, flat error 등에 의한 영상 자체의 열화가 많아 HVC 연구를 위한 영상으로 사용되기에는 무리가 많다. 가장 이상적인 해결방안은 NHK에서 제작한 카메라 자체에 열화제거를 위한 장치들을 설치하여 규칙적인 열화를 제거한 영상을 확보하는 것이지만, 특수 제작된 카메라여서 이 방법은 불가능하다. 본 논문은 이 NHK의 영상을 wavelet 기반의 denoise filter를 응용하여 영상의 열화를 일정부분 제거하면서 영상의 디테일이 최대한 유지되도록 하여, 기존의 영상보다 깔끔한 8K UHD 영상을 획득하는 방안을 제시한다.

외현적 자기애와 SNS중독 경향성의 관계에서 사회적 건강상태의 조절효과 검증

김기섭(Kim, Ki-Sub),김소연(Kim, So-Youn) 한국체육과학회 2015 한국체육과학회지 Vol.24 No.5

The purpose of this study was to verify the regulation effect of the social health conditions of the relationship between overt narcissism and SNS addiction. For the research subjects 346 persons were sampled from the enrolled students who are in college of physical education in K and S University were used for this research analysis. Questionnaires were used for the research tools, and the data were analyzed using SPSS Windows 21.0 Version, frequency analysis and moderated regression analysis. The results of this study were as follows. First, the sociality has the regulation effect between overt narcissism and SNS addiction. Second, the morality doesn’t have the regulation effect between overt narcissism and SNS addiction. Third, the self-esteem has the regulation effect between overt narcissism and SNS addiction. Fourth, the achievement motivation has the regulation effect between overt narcissism and SNS addiction.

저비율의 안정제를 이용한 CdTe 나노선 합성

김기섭 ( Ki Sub Kim ),강정원 ( Jeong Won Kang ) 한국화학공학회 2015 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.53 No.6

Cadmium telluride(CdTe) 나노입자의 자기조립으로 형성된 나노구조체는 독특한 특성 때문에 여러 분야에서 활발히 연구되고 있다. 나노구조체의 광학적, 물리적 특성은 물질 형태에 크게 의존하기 때문에 나노구조를 제어하는 기술은 나노과학 분야에서 가장 핵심적인 요체이다. 이번 실험에서 각 나노입자의 자기조립을 통해 나노선이 제조됨을 확인하였다. 안정제로 사용된 thioglycolic acid(TGA)와 Cd 이온의 비율을 기존의 2.4:1에서 1.3:1로 낮추어 CdTe 나노선을 합성 하였다. 자기조립을 통해 생성된 나노입자는 곧고 긴 형태였으며 다결정을 이루고 있었다. 이렇게 합성된 나노선은 투과전자현미경(TEM)과 주사전자현미경(SEM)으로 관찰하였으며, 작게는 500 nm에서 크게는 10 μm 이상의 곧고긴 나노선이 합성된 것을 확인할 수 있었다. Nanomaterials (NMs) based on cadmium telluride (CdTe) are the theme of numerous research areas due to their unique chemical and physical properties. NM synthesis via a size-controlled procedure has become an intriguing research topic because NMs exhibit novel optical and physical properties depending on their size and shape. In this study, we prepared CdTe nanowires (NWs) via self-assembly from individual Nanoparticles (NPs). Thioglycolic acid (TGA)-to-Cd ion ratio of 1.3 was used instead of the traditional value of 2.4 and the reduced amount of stabilizer resulted in reorganization from individual NPs into NWs consisting of multi-layers of individual NPs. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) were performed to characterize NWs. The produced nanowires were straight and long in shape and their length ranged from 500 nm to tens of micrometers.

폐기물 재활용을 위한 사용후핵연료 처리기술

박병흥,김기섭,Park, Byung Heung,Kim, Ki-Sub 한국교통대학교 융복합기술연구소 2012 융ㆍ복합기술연구소 논문집 Vol.2 No.1

Spent fuels are discharged from nuclear reactors as a result of power generations. The spent fuels would be considered as a useful resources because the main constituent is uranium and some other actinides are included in them. In order to utilize the resources chemical processes should be developed to treat the spent fuels and obtain uranium and other actinides to be fueled in a fast reactor. The technologies are categorized into wet and dry processes. In this study, the current status of such technologies is summarized to give a insight and a deep understanding on nuclear fuel cycles.

DSC를 이용한 이온성 액체 열용량 측정 기술 현황

조예림,김기섭,박병흥,Jo, Ye Lim,Kim, Ki-Sub,Park, Byung Heung 한국교통대학교 융복합기술연구소 2014 융ㆍ복합기술연구소 논문집 Vol.4 No.1

Recently ionic liquids received much attention as novel materials capable of replacing traditional solvents. The applicability of the ionic liquids should be determined based on their physico-chemical properties. Heat capacity is one of the most important properties to be considered when a process is developed using the ionic liquids and currently DSC has been proved as an effective technique to measure the heat capacity. Micro DSCII can measure heat capacities of various liquids by both an isothermal step method and a scanning method. DSC Q100 and MDSC are able to measure heat capacities of several ionic liquids. For each ionic liquid linear regression of the heat capacity as a function of temperature has been performed to increase accuracy. To investigate the feasibility of ionic liquids as PCMs, their heat capacities have been measured by using Pysis I DSC. This paper briefly summarizes the present techniques of measuring heat capacities of ionic liquids by DSC.

SI 열화학 수소 생산 공정의 분석을 위한 열역학 모델의 적용

이준규,김기섭,박병흥,Lee, Jun Kyu,Kim, Ki-Sub,Park, Byung Heung 한국교통대학교 융복합기술연구소 2012 융ㆍ복합기술연구소 논문집 Vol.2 No.2

The SI thermochemical cycle process accomplishes water splitting through distinctive three chemical reactions. We focused on thermodynamic models applicable to the process. Recently, remarkable models based on the assumed ionic species have been developed to describe highly nonideal behavior on the liquid phase reactions. ElecNRTL models with ionic reactions were proposed in order to provide reliable process simulation results for phase equilibrium calculations in Section II and III. In this study, the current thermodynamic models of SI thermochemical cycle process were briefly described and the calculation results of the applied ElecNRTL models for phase equilibrium calculations were illustrated for binary systems.

여성 댄스스포츠 참가자의 참여수준에 따른 여가만족도의 차이 분석

김소연(Kim, So-youn),김기섭(Kim, Ki-Sub),조경훈(Cho, Kyung-Hoon) 한국체육과학회 2013 한국체육과학회지 Vol.22 No.5

This study is based on an analysis of the difference in levels of leisure satisfaction for adult female’s gained from their degree of participation in dance sports. The hypothesises for this study are : Ⅰ. There are some differences in level of leisure satisfaction depending on the specifics of population statistics. Ⅱ. There are some differences in leisure satisfaction depending on the degree of participation. This study’s specific targets are 252femalesl who have been participation in dance sports for over 3 months in Seoul and Kyunggi areas Ⅰ. For the investigation of population statistics One-way ANOVA and the Duncun for Post-hoc were used. From the results there are some differences, theses being the satisfaction of mental state and relaxation based on the different age group. At various economic levels, there was a difference in leisure satisfaction factors. There is on difference here, other than the satisfaction of environmental factors. Regarding the difference of leisure satisfaction based on education levels of the participations, there are three differences; educational, relaxational and physiological factors. For the investigating of the differences in leisure satisfaction based on mployment status, Independent samples t-test was done. According to the results there is no difference there only the environmental factors. Ⅱ. One-way ANOVA for the difference of leisure satisfaction compared with the frequence of participation. According to the results two differences appear based on physiological and relaxational factors. And the same method was used to measure in levels of leisure satisfaction with strength of participation. According to this, only environmental factors didn’t make any difference.