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A Study on Ion Exchange Kinetics of Zeolite 4A Powders
Lee, Hanju,Lee, Kwang Suk 연세대학교 대학원 1985 延世論叢 Vol.21 No.4
Two zeolite A samples with mean particles size of 0.91 and 1.60μm, respectively, were ion-exchanged by cadimum chloride solution in a stirred beaker. From equilibrium isothern data, thermodynamic equilibrium constants at 298(K) and 313(K) were obtained using the Kielland plot. Ion exchange rate data were analyzed by a uniform sphere model, a similar to but modified DiGiano-Weber model, to obtain pore diffusion coefficient as well as film mass transfer coefficient. From the results, the effects of initial cadmium concentration, zeolite particle size and agitation speed on these mass transport properties were evaluated.
이한주(Hanju Lee),이정호(Jung Ho Lee),오승협(Seung Hyub Oh) 한국추진공학회 2013 한국추진공학회 학술대회논문집 Vol.2013 No.5
KSLV-I 상단 킥모터는 고체 추진기관으로 점화기와 점화안전장치로 구성된 점화구동부, 복합재 케이스부, 추력벡터제어가 가능한 잠입형 노즐부, 그리고 추진제로 구성되어 있다. 킥모터를 구성하는 각 서브시스템들은 비행 임무 달성을 위한 개발 요구조건을 만족시켰으며, 2013년 1월 30일 나로호 3차 비행 시험 결과로부터 성공적으로 개발이 완료되었음을 확인할 수 있었다. 본 논문에서는 킥모터에 대한 요구조건, 요구조건을 만족하기 위한 형상관리, 중량 변화, 추력 축 정렬 결과 및 주요 시험 결과 등에 대해 다루었다. KSLV-I upper stage KM (Kick Motor) is a solid propulsion system which is consist of igniter, SAD (Safety Arming Device), composite case, submerged nozzle capable of TVC (Thrust Vector Control) actuation. Each subsystem of KM fulfilled development requirements for achieving a flight mission successfully. We confirmed that the successful development of KM from the 3rd flight test results of NARO on January 30, 2013. This article deals with the requirements of KM and the results on configuration management, mass variation, thrust axis alignment, and major test results and so on.
이한주(Hanju Lee),이정호(Jung Ho Lee),오승협(Seung Hyub Oh) 한국추진공학회 2014 한국추진공학회지 Vol.18 No.1
KSLV-I (Korea Space Launch Vehicle-I) 상단 킥모터는 고체 추진기관으로 점화기와 점화안전장치로 구성된 점화구동부, 복합재 케이스부, 추력벡터제어가 가능한 잠입형 노즐부, 그리고 추진제로 구성되어 있다. 킥모터를 구성하는 각 서브시스템들은 비행 임무 달성을 위한 개발 요구조건을 만족시켰으며, 2013년 1월 30일 나로호 3차 비행 시험 결과로부터 성공적으로 개발이 완료되었음을 확인할 수 있었다. 본 논문에서는 킥모터에 대한 요구조건, 요구조건을 만족하기 위한 형상관리, 중량 변화, 추력 축 정렬 결과 및 주요 시험 결과 등에 대해 다루었다.
이한주 ( Hanju Lee ),임홍재 ( Hong Jae Yim ) 한국구조물진단유지관리공학회 2018 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.22 No.1
Recently, high-performance and high-fluidity concrete have been studied and developed because high-rised build is constructed. high-performance and self-consolidating concrete is demanded high strength as low w/cm and fluidity as adding superplasticizer. However, these superplasticizer are changed early-age property such as bleeding, segregation and late setting time etc. This study persents the setting time of fluidity mortars evaluated using the measurement of eletrical resistivity. 7th Samples prepared mortars which were adding polycarboxylate type superplasticizer(Ester) or poly naphthalene sulfonate(PNS) and measured the electrical resisitivity during 24 h. As a results, mortars which added superplasticizers were late rising time which is setting time in measurement of electrical resistivity. However, degree of hardening of PNS mortar were higher than Ester mortar.
이한주(HanJu Lee),장민규(MinGyu Jang),문진동(JinDong Moon),조윤호(YoonHo Cho) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
LKAS(Lane Keeping Assist System) detects front lane border by camera sensor which is specifically designed for line detection. LKAS system detects when a vehicle is about to depart from the existing lane, intimates the driver using acoustic and visual warning methodology and then calculates the reverse steering torque, as required to maintain the existing lane position, which is then applied by EPS(Electric Power Steering) without any driver intervention. This study suggests a Hardware-in-the-Loop Simulator, which can validate LKAS system. Simulator is based on real-time simulation methodology. Lane information from a real-time vehicle dynamics model is converted to 3 dimensional line formula in order for the LKAS MCU to receive decent line information through RS-232 protocol. A monitor display is prepared that makes LKAS take a vehicle model animation in real time, to validate lens, COMS & image processor. The developed simulator results are compared with real car results, which validate the usefulness of the simulator for LKAS development.
모바일 마케팅 디자인의 광고 유형이 소비자의 광고 수용성과 구매 의도에 미치는 영향
이한주(HanJu Lee),현은령(EunRyung Hyun) 한국디자인학회 2024 디자인학연구 Vol.37 No.1
Background : The design type of mobile marketing advertisement has the function of attracting consumers’ attention but has become a factor in avoiding advertisements. Through this study, we aim to provide basic data that could increase the efficiency of mobile advertising by investigating and analyzing the types of mobile advertising designs preferred by consumers. Methods : After setting the preferences of six mobile advertising design formats as independent variables, advertisement acceptability and purchase intention were composed of dependent variables based on the Ryu (2022) model. Next, data was collected by conducting a survey on mobile advertising design preferences from October 24 to October 31, 2022. For the analysis tool, one-way distribution analysis was performed using IBM SPSS statistics 26.0, then post-evaluated using Scheffes method. Results : Video, delivery, search, and interaction advertisement formats were found to be more significant in terms of average advertisement acceptability and purchase intention than banner and social media advertisements. Also, there were significant results from advertising design types that broke away from existing mobile advertising designs, consisting of new techniques and contents to attract consumers’ attention. Conclusions : This study examines the types of mobile marketing advertising designs preferred by consumers in relation to advertising acceptability and purchase intention. In mobile advertising, continuous messages and advertisements that engage consumers will be able to effectively deliver products. We hope through this study that the research material will contribute to the development of the fast-changing industry of mobile advertisement design.