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이환광(Lee, Hwan-Kwang),전필선(Jun, Pil-Sun),정태경(Chung, Tea-Kyung),하병근(Ha, Byoung-Gun),장기원(Jang, Ki-Won),이성택(Lee, Sung-Taek) 한국산학기술학회 2008 한국산학기술학회 학술대회 Vol.- No.-
과산화물 가교제의 농도가 헬리콥터 연료탱크의 자기밀폐층 소재로 적용시키기 위한 천연고무 스폰지 의 팽윤에 미치는 효과를 조사하였다. 천연고무 콤파운드를 Kneader와 Roll-Mill을 활용하여 제조하고, 고압조건의 프레스에서 부분 가교시킨 후 대기압의 금형에서 발포와 완전가교를 실시하였다. 얻어진 스폰지의 겉보기밀도를 측정하고 스폰지의 셀구조를 주사전자현미경을 통하여 관찰하였다. 톨루엔, 이소옥탄과 항공유를 사용하여 실온에서 팽윤실험을 실시하였다. 용매에 2분 동안 침적 후 얻어지는 부피팽윤비 값은 과산화물 농도가 감소함에 따라 증가하다가 감소하는 경향을 보였다. 스폰지의 겉보기밀도와 셀구조는 과산화물 함량에 매우 민감하였으며 이는 또한 천연고무 스폰지의 팽윤거동에 영 향을 미쳤다. 천연고무 스폰지가 연료와 접촉하여 신속한 팽윤이 얻어지기 위하여 금형에서 동시에 발 생하는 두 가지 반응인 발포제의 분해반응과 천연고무의 가교반응을 적절히 조절하는 것이 중요하다.
An Empirical Study on Factors Affecting Customer Intention to Use Mobile Payment System in Vietnam
응엔프엉이(Nguyen Phuong Y),이성택(Sung Taek Lee),강위만(Wi Man Kang),김정석(Jeong Suk Kim),김광용(Gwang Yong Gim) 한국IT서비스학회 2015 한국IT서비스학회지 Vol.14 No.4
Nowadays, mobile commerce is having an increasingly profound impact on our daily lives, and offer interesting and advantageous new services. Mobile payment is an emerging and important application of mobile commerce in smart work, enabling users to use their mobile devices (especially mobile phones) for paying goods and services wherever they go. The appearance of m-payment is expected to provide us a convenient and bright future to enjoy. That is the common trend on over the world, but in Vietnam, although the number of smart phone users has been increasing rapidly, the adoption of m-payment system still didn't succeed completely. The research reviewed literature regarding mobile payment services, analyzed the impact of customer characte-ristics and system characteristics on m-payment adoption in Vietnam. To analyze the adoption behaviors of m-payment users, m-payment research model which consists of three customer-characteristics (m-payment trust, personal innovativeness, m-payment knowledge) and four m-payment system characteristics (mobility, reachability, convenience, compatibility) were studied. The results indicate that perceived usefulness, trust, and compatibility are the important predictors to the intention to use m-payment. This study will assist m-payment services suppliers in implementing appropriate business models and service strategies to successfully attract customer to use m-payment in Vietnam, allowing managers to exert appropriate investment, time, and effort for m-payment system development in designing smart working.
서은희,송은승,한억,이성택,양재경,이기영,Suh, Eun-Hee,Song, Eun-Seung,Han, Uok,Lee, Sung-Taek,Yang, Jae-Kyung,Lee, Ki-Young 유기성자원학회 1997 유기물자원화 Vol.5 No.1
본 연구는 음식물 찌꺼기의 사료화를 목적으로 종균제(YM, 영진환경)와 아프리카산 고온성 효모인 Kl. marxianus를 이용하여 음식물 찌꺼기를 발효시켜 보존성을 연장하기 위해 실시하였다. 6일 동안 발효시, 편성 호기적 또는 혐기적 조건보다는 2일간 호기적 조건으로 발효시킨 뒤 계속하여 4일간 혐기적으로 발효시켰을 때 유기산 생성량이 높았고 생균수도 가장 높았다. 종균제(YM)의 첨가는 무첨가 시료보다 발효 후 잔여 총 생균수를 100배 이상으로 크게 증가시켰으며 여기에 Kl. marxianus 배양액을 추가로 첨가할 경우 총생균수는 더욱 증가시켰으나 효모수를 더 증가시키지는 않았다. The fermentative conversion of food wastes into feed was investigated by seeding of mixed inoculum YM (Youngjin Environmental co.), and thermotolerant yeast Kl. marxianus. For 6 days' fermentaion, the fermentation method of 2 days' aerobic followed by 4 days' anaerobic was better for the production of organic acids and increasing total microbial population than 6 days' continuous aerobic or anaerobic fermentation. By seeding YM, the total microbial count increased about 100 times of the control group. In addition, Kl. marxianus seeding together with YM increased total viable cell count, but did not increase yeast count significantly.
구옌후휴 ( Huu Hieu Nguyen ),이성택 ( Sung Taek Lee ),최수형 ( Soo Hyoung Choi ) 한국화학공학회 2011 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.49 No.5
The objective of this study is to propose a mathematical model for a pervaporation process for concentrating hydrogen peroxide. The process was developed by NASA, which consists of a shell and membrane tubes, where a liquid hydrogen peroxide solution flows in the shell, and a sweep gas flows in the tubes countercurrent to each other. The liquid retentate is concentrated as more water molecules permeate and evaporate through the membrane than hydrogen peroxide. For this process, a mathematical model has been developed in the form of a system of nonlinear partial differential algebraic equations based on a sorption-diffusion mechanism for permeation, an Arrhenius relationship for the temperature dependency of the permeate flux, and mass and momentum balances for the liquid concentrations and flows in the membrane module. The dynamic behavior of the concentration of hydrogen peroxide in the retentate side has been simulated by solving a simplified version of the proposed model, and the result is compared with the experimental data reported in the NASA patent.