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김지양 ( Jiyang Kim ),김정규 ( Jungkyu Kim ) 한국게슈탈트상담심리학회 2012 한국게슈탈트상담연구 Vol.2 No.1
his paper introduce a individual gestalt therapy case and review which i interpretation ‘moment of meeting’, ‘body process’ and ‘shame’. Each session was supervised by Jungkyu Kim. Supervision was done online. This case study was conducted with consent and all clientinformation was paper. chief complaints religious conflict and relation difficult. Therapy and supervision w based on estalt therapy theory, included topdog underdog, body process and shame.
Kim, Seohyeon,Kim, Jungmok,Jang, Jungkyu,Mo, Hyun-Sun,Kim, Dong Myong,Choi, Sung-Jin,Park, Byung-Gook,Kim, Dae Hwan,Park, Jisun American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.5
<P>Silicon nanowire ion-sensitive field-effect transistor (SiNW ISFET) is widely used for the label-free detection and real-time analysis in chemical and biological experiments. However, hysteresis and dynamic transfer characteristic related to time dependence are main drawbacks of SiNW ISFET. By changing hold time (T-H), delay time (T-D), and pH level under aqueous environment, we explained mechanism of hysteresis and dynamic transfer characteristic through analyzing the electrical characteristics. We believe that the results found in this study are able to minimize the effects caused by hysteresis, which contributes to advanced biosensing experiment in the future.</P>
Jang, Jungkyu,Kim, Jungmok,Kim, Seohyeon,Mo, Hyun-Sun,Kim, Dong Myung,Choi, Sung-Jin,Park, Byung-Gook,Kim, Dae Hwan,Park, Jisun American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.5
<P>Although the ion-sensitive field effect transistor (ISFET)-based biosensor has a great potential for point-of-care testing systems, the current drift still remains as a challenging issue for its commercialization. Furthermore, the drift makes the design of readout circuit for a high-resolution biosensor very complicated because it is very sensitive to the amount of ionic species in electrolyte or human serum. However, its chemical/physical origin in neither yet fully understood nor modeled for the circuit design and simulation. In this paper, the mechanism of current drift in ISFET was explained by short term reaction and long term reaction dependent on position of hydrogen ion. Besides, we proposed the analytical drift model of drain current and threshold voltage for different pH levels and various device sizes in the top-down processed SiNW ISFET. We believe that our result is potentially useful for the drift-aware circuit design for high-resolution biosensor system.</P>
헤미셀룰로오스 가수분해물 첨가를 통한 셀룰로오스 나노피브릴의 건조공정에서의 응집 방지 및 재분산성 강화
김정규 ( Jungkyu Kim ),방준식 ( Junsik Bang ),김윤진 ( Yunjin Kim ),정민정 ( Minjeong Jung ),김종화 ( Jong-hwa Kim ),최인규 ( In-gyu Choi ),곽효원 ( Hyo Won Kwak ) 한국목재공학회 2022 한국목재공학회 학술발표논문집 Vol.2022 No.1
나노셀룰로오스는 뛰어난 기계적, 열적 특성으로 인해 석유 기반 고분자를 대체할 수 있는 물질로 주목 받고 있다. 하지만 나노셀룰로오스의 실제 산업 분야에서의 상용화를 위해서는 제조 및 저장, 운송에 있어서의 효율성 및 안정성이 보장되어야 한다. 이러한 관점에서 나노셀룰로오스의 상용화에 있어 탈수 및 건조 공정에서 발생하는 비가역적인 응집 현상은 우선적으로 해결해야 할 과제이다. 나노셀룰로오스의 응집 현상은 건조 과정에서 발생하는 분자 간 강한 수소 결합 형성에 의해 일어나며, 이로 인하여 나노셀룰로오스의 구조가 변화하며 성능은 크게 감소한다. 따라서 지금까지 나노셀룰로오스 제품들은 일반적으로 1~10wt% 농도의 현탁액 상태로만 취급되고 있다. 본 연구에서는 목질계 바이오매스의 계층적 구조에서 영감을 받아 나노셀룰로오스의 건조 시 비가역적인 수소 결합 발생을 방지하기 위해 헤미셀룰로오스 가수분해 산물인 자일로스를 친환경 첨가제로 사용하였다. 다양한 비율의 오븐 건조한 CNF/자일로스 필름을 제조하고, 건조 면적 및 표면 몰폴로지를 분석하였다. 그리고 재분산 동역학 및 침전 실험을 통해 최적의 자일로스 첨가량을 결정하고, 입도 및 유변학적 특성 분석을 통해 CNF 현탁액의 분산성 회복을 확인하였다. 수용성 바이오폴리머인 자일로스는 증류수를 이용한 수세 공정으로 쉽게 제거할 수 있었고, 이를 수세 전후 고형분의 질량 비교와 FTIR 측정을 통해 확인이 가능하였다.
김기훈(Kihoon Kim),김경호(Kyungho Kim),김형탁(Hyoungtak Kim),이주성(Jusung Lee),신민철(Mincheol Shin),김창원(Changwon Kim),윤진한(Jinhan Yun),이정규(Jungkyu Lee),홍원석(Wonseok Hong) 한국환경에너지공학회 2023 한국열환경공학회 학술대회지 Vol.2023 No.1
선택 적 비촉매 환원법 (Selective Non-Catalytic Reduction)은 소각로의 연소실 내부로 환원제를 주입하여 연소과정에서 발생하는 질소산화물을 제거하는 기술이다. 대부분의 소각시설에서는 환원제로 요소수를 사용하고 있으며, 이류체 노즐을 통하여 분사된 요소수는 연소가스 중 질소산화물을 질소와 수증기로 환원시킨다. 이러한 선택적 비촉매 환원법의 경우에 초기 투자비 및 유지비가 적다는 장점이 있으나 요소수가 액상으로 주입되기 때문에 질소산화물과의 반웅 효율이 낮아 일부 미반응된 요소수가 대기 중으로 배출되는 암모니아 슬립 발생에 대한 문제점이 있다. 또한 계속해서 강화되는 대기오염물질 배출허용기준과 미세먼지 관리 종합대책의 후속 조치로 질소산화물 배출 부과금제가 시행됨에 따라 기존의 소각시설들은 질소산화물의 관리를 강화할 수 있는 현실적인 대책이 필요한 실정이다. 따라서 본 연구에서는 요소수를 기화시킨 후 소각로 내부로 주입하여 암모니아 슬립 발생은 줄이면서 질소산화물의 저감 효율은 극대화하고자 하였으며, 추가적인 가열설비의 구축 없이 소각로에서 발생되는 폐열을 활용하여 이를 구현하고자 하였다. 요소수의 기화 및 주입을 위하여 소각로 잉여 열원의 현황을 파악하고 운영조건을 사전에 검토하였으며, 온도와 압력에 따른 요소수의 기화 특성을 실험적으로 확인하여 설비 제작을 위한 설계 인자를 도출하였다.
Microfluidic approaches for gene delivery and gene therapy
Kim, Jungkyu,Hwang, Inseong,Britain, Derek,Chung, Taek Dong,Sun, Yu,Kim, Deok-Ho Royal Society of Chemistry 2011 Lab on a chip Vol.11 No.23
<P>Recent advances in microfluidics have created new and exciting prospects for gene delivery and therapy. The micro-scaled environment within microfluidic systems enables precise control and optimization of multiple processes and techniques used in gene transfection and the production of gene and drug transporters. Traditional non-viral gene transfection methods, such as electroporation, microinjection and optical gene transfection, are improved from the use of innovative microfluidic systems. Additionally, microfluidic systems have also made the production of many viral and non-viral vectors controlled, automated, and reproducible. In summary, the development and application of microfluidic systems are producing increased efficiency in gene delivery and promise improved gene therapy results.</P> <P>Graphic Abstract</P><P>This article reviews the state-of-the-art microfluidics-mediated gene transfection techniques and microfluidic approaches for the fabrication of gene carriers. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1lc20766k'> </P>
Kim, Heejoong,Jang, Eunhee,Jeong, Yanghwan,Kim, Jinseong,Kang, Chun Yong,Kim, Chang Hwan,Baik, Hionsuck,Lee, Kwan-Young,Choi, Jungkyu Elsevier 2018 CATALYSIS TODAY - Vol.314 No.-
<P><B>Abstract</B></P> <P>A hierarchically structured zeolite (self-pillared pentasil; SPP) comprised of MFI nanosheets or lamellae has been synthesized in various Si/Al ratios and mesoporosities. It turns out that a simple removal of ethanol in a synthesis sol resulted in increased mesoporosity, while the additional reduction of water further increased mesoporosity. In addition, we could synthesize the SPP particle with the actual Si/Al ratio as low as ∼23 with a modest mesoporosity. With these hierarchically structured SPP particles, we further conducted copper impregnation on them in order to use as a hydrocarbon (HC) trap. The resulting Cu-impregnated SPPs could not only adsorb HCs in the exit gas stream including water vapor, but also serve as an active oxidizer of HCs. Specifically, Cu-impregnated SPP with an actual Si/Al ratio of ∼22 and medium mesoporosity exhibited very high performance in cold-start trap tests; desirably adsorbing propene and toluene even in the presence of 10 vol% steam, holding them up to higher temperatures (90 °C for propene and 190 °C for toluene), and furthermore, oxidizing the hydrocarbons. The preferred adsorption can be attributed to the larger amount of exchanged Cu<SUP>2+</SUP> ions in SPP particles with a lower Si/Al ratio, while the additional oxidation was due to the CuO particles dispersed on the SPP surface. However, the hydrothermal stability test revealed that the zeolite structure in the Cu-impregnated SPPs was collapsed and transformed into another undesired phase, thus losing the above-mentioned adsorption ability. Nevertheless, the corresponding oxidation performance was well maintained, indicating the robust, active role of the CuO particles.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The mesoporosity in SPP particles was increased by removing ethanol and water. </LI> <LI> Mesoporous SPP particles with a Si/Al ratio as low as ∼23 could be synthesized. </LI> <LI> Cu-impregnated SPPs were effective for eliminating hydrocarbon (HC) in a cold start. </LI> <LI> The effect of physicochemical properties of SPPs on the HC trap was investigated. </LI> <LI> Cu<SUP>2+</SUP> ions increased HC adsorption, while CuO contributed to HC oxidation. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>