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피톤치드를 함유한 생분해성 친환경 마이크로 캡슐의 제조 및 그 성질
조동혁,이철태,오치훈,서다혜 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
피톤치드는 식물이 병원균, 해충, 곰팡이 등에 저항하기 위해 내뿜거나 분비하는 물질로 살균, 향균, 탈취 등에 탁월한 효능을 발휘한다. 그러나 피톤치드는 매우 강한 휘발성 물질이기 때문에 장시간 사용하기 위해서는 휘발성을 제어해야만 한다. 이를 위해 피톤치드를 마이크로 캡슐화하여 피톤치드를 외부로부터 보호하며 방출 속도를 조절, 그 작용이 장시간 동안 유지되도록 한다. 하지만, 기존의 마이크로 캡슐은 가교제로써 인체 및 환경에 매우 유해한 글루탈알데하이드, 포름알데하이드 등을 사용하는 경우가 대부분이다. 따라서, 본 연구에서는 생분해성 고분자인 키토산을 벽재물질로 하여 환경에 무해한 친환경 가교제를 이용, 마이크로 캡슐을 제조하였다. 또한, 가교제, 심물질, 교반 속도에 따른 마이크로 캡슐의 형태 및 제형성을 SEM을 통해 확인하였으며, 캡슐화에 따른 방출거동은 UV-Vis를 통해 확인하였다.
An Exploratory Study on Success Factors of Technology-based start-ups
조동혁,김종영 한국인터넷정보학회 2018 인터넷정보학회논문지 Vol.19 No.6
This study was conducted to empirically verify the effect of the technological entrepreneurship, network capability and technological innovation capability on the innovative performance of technology-based start-ups with the aim of determining the success factors of technology-based start-ups by defining the success of technology-based start-ups as the innovative performance through technology innovation activities. For the significance of this study, it suggested the importance of technology innovation as a survival strategy of technology-based start-ups, verified the dimensions, relationship and roles of technological entrepreneurship, network capability and technology innovation capability, thereby proving the theoretical expansion. This study has determined the success factors of technology-based start-ups and thereby suggested the strategic directions for enhancing the competitiveness of technology-based start-ups.
조동혁,Young-seog Lee 한국자동차공학회 2019 International journal of automotive technology Vol.20 No.Supp
This study proposes a fast running model that interconnects input and output data for a single-pass cold bar drawing process through the use of Artificial Neural Network (ANN) and automatically generated a large volume of elasticplastic finite element (FE) analysis results. The prediction accuracy of the FE analysis was verified by comparing the FE analysis with measurements from a drawing experiment. A Python-based script that automatically controls ABAQUS was coded to sequentially produce output data that varies according to the input data, which is a combination of 18 grades of steel and 1,000 process conditions. The ANN was trained using input and output data, and then a nine-dimensional fast running model was developed. The fast running model predicted the values of output variables (drawing force, strain at the center, strain on the surface, accumulated damage at the center, contact pressure, and the fracture (or non-fracture) of the material) in 0.1 second no matter how the mechanical properties of the steels and process conditions change. With this fast running model, engineers in the drawing industry can easily determine or modify the process conditions to improve productivity and product quality even when a grade of steel that has never been employed before is drawn.
Understanding the Omni-Channel Acceptance: Focused on TTF and UTAUT Models
조동혁,이상민 한국인터넷정보학회 2019 인터넷정보학회논문지 Vol.20 No.1
Recently, Omni Channel Services has been considered the most innovative business strategy. Omni-Channel sees a variety of channels from all channels viewpoints, organically combining each channel to provide a seamless experience for consumers. In other words, Omni-Channel is not simply a systematic integration of channels, but a means of delivering consistent services to consumers in all processes through a strategy to an organic connection. The aim of this study is to provide a comprehensive insight into the decision factors affecting the adoption of Omni-channel. For this purpose, an empirical analysis is conducted on the course of acceptanceof the Omni-channel service based on the Unified Theory of Acceptance and Use of Technology (UTAUT) and Task-technology fit (TTF), an effective model frequently selected to describe the acceptance of service in the introduction phase of new information technology. As a result of the study, it was confirmed that the task characteristics and the technical characteristics had a positive effect on the task-technology fit, and the task-technology fit had a positive effect on the performance expectancy. In addition, task-technology fit, performance expectancy, and social influence have a positive effect on the intention to use the Omni-Channel. This study is intended to deliver an experimental meaning by proposing a strategical measure to understand the behaviorsand uses of consumers in the Omni-channel service environment and increase the customer satisfaction for the system.
Morphology-Selective Synthesis of Silicon Carbide by Magnesiothermic Reduction
조동혁,( Do Thi Uyen ),이영복 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Silicon Carbide(SiC) has various advantages such as excellent bio-compatibility, high temperature stability and abrasion resistance. In addition, it is widely applied and researched in various fields as it can be manufactured in various forms, such as sphere and honeycomb. Spherical shapes are mainly used in the bio field through surface functionalization. In the case of honeycomb, it can be applied extensively in many areas because of advantages of SiC and honeycomb shaped with properties of high strength and light weight. In this study, we suggest a SiC synthesis method that allows to select a sphere or honeycomb by changing synthetic conditions. Additionally, this method can synthesize at mild temperatures than conventional methods. This SiC will be available for drug delivery systems or sensors by inserting specific materials into the honeycomb, and in the ceramic and semiconductor, the production of more advanced products will be possible due to properties of honeycomb structures.