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서민교(Minkyo Seo),김도헌(Dohun Kim),서찬우(Chanwoo Seo),장석필(Seokpil Jang),구자예(Jaye Koo) 한국추진공학회 2012 한국추진공학회 학술대회논문집 Vol.2012 No.11
동축형 전단 분사기의 액적분포 균일도를 향상시키는 방법으로 고안된 다공성 분사기의 개발에 앞서 다공성재의 압력강하 특성을 파악하였다. 고속/대유량에서 다공성재를 지나는 유동은 압력강하가 속도에 대해 비선형적인 관계를 가지는 Non-Darcy 유동이다. 본 연구의 목적은 다공성재를 통과하는 압축성 유체의 압력강하 특성을 나타내는 투과율과 Ergun 상수의 계산방법을 도출하여 향후 다공성 분사기의 개발에 확실한 설계 기반을 제공하는 것이다. To study the pressure drop characteristics of porous media, prior to develop a porous injector, which design for a method to improve coaxial shear injector of droplet distribution the uniformity. The flow through porous media is Non-Darcy flow which have non-linear relationship between pressure drop and velocity in high speed and high mass flow rate. The purpose of this study is that find the permeability and Ergun coefficients of compressible fluid through porous media derived from the experiments. After on to compare and examine its results to provide authentic base plan for development of the porous injector in the future.
서민교(Minkyo Seo),박문진(Wenjin Piao),양안봉(Yanfeng Yang) 한국인터넷전자상거래학회 2011 인터넷전자상거래연구 Vol.11 No.2
Recently, with the coming of information society based on information and communication technologies, the E-commerce in China rapidly developed, enriched and made the live of human beings convenient in virtual space which breaks the barrier of space and time. On the contrary, it also brought all kinds of violation of privacy. Nowadays, a handful of local governments in China recognized the importance in maintaining legal and institutional systems to compose special regulations relate to the protection of personal information applied to some sectors. However, there still lack of a special and completing law that could cover the whole China. Therefore, in this study, by the examination of China's personal information protection legislation status, we reveals the existing problems and also suggested that composing special and completing regulations and establishing independent supervisory institution with powerful authority and position to guarantee the effectiveness of integrated law and promoting the activation of China's E-commerce. In conclusion, it is essential to take some promotion measures for the protection of personal information in accordance with the orientation of global legal concerning the regulations and principles of the protection of personal information in China.
자성체의 투자율과 솔레노이드 흡인력 변화에 대한 해석적 연구
서민교(Minkyo Seo),백기봉(Kibong Baek),조승환(Seunghwan Cho) 한국추진공학회 2015 한국추진공학회 학술대회논문집 Vol.2015 No.11
액체 추진 시스템에서 유체 제어용으로 활용되는 솔레노이드는 자성체를 이용해 만든 보빈에 코일을 감고, 코일의 바깥쪽 주위에 자성체로 만든 C자 형태의 프레임인 요크를 붙여 보빈과 요크를 흐르는 폐루프 자속을 얻는다. 본 연구에서는 자성체의 비선형적인 투자율 증가에 따른 흡인력 변화를 예측하기 위해 범용 전산해석 코드인 FEMM 4.2를 이용하여 해석을 수행하였으며, 이를 통해 자성체의 비선형적인 투자율 증가를 고려한 솔레노이드 설계 활용방안을 제시하였다. A solenoid being applied as for fluid control in various types of space propulsion systems obtains closed-loop magnetic flux flowing through the bobbin and the yoke by winding a coil around a bobbin made with a magnetic material and attaching a yoke, the C-shaped frame made with a magnetic material around the outside of the coil. In this study, we carried out the electromagnetic analysis by using FEMM 4.2 to predict the attraction force changes according to non-linear permeability increase of the magnetic material, it presents the solenoid design utilizing considering the non-linear permeability increase of the magnetic material.
중국 전자상거래에서의 소비자보호를 위한 자율규제에 관한 사례분석
서민교(Minkyo Seo),양안봉(Yanfeng Yang) 한국인터넷전자상거래학회 2010 인터넷전자상거래연구 Vol.10 No.4
This paper deals with the protection of consumers in electronic commerce(EC) in China. This study provides an overview of the development of EC in China, and to review the current consumer problems and protection issues in China EC market. We find that one distinctive feature in consumer protection in EC context in China is that there is a strong self-regulations imposed by businesses due to lack of regulatory actions. The purpose of this paper is to contribute to the development of protection of consumers in China EC market by analyzing a business self-regulation case, Dangdang.com. In conclusion, China has not yet made any law for the protection of consumers in the context of EC, and business self-regulations have many limits in fully protecting consumer rights in EC context. Therefore, China must make some laws and improve current limits of business self-regulation at the same time in order to perfect the protection of consumers in China EC market.
비자성소재 삽입에 따른 아마추어 구동용 솔레노이드의 흡인력 변화에 대한 해석적 연구
서민교(Minkyo Seo),백기봉(Kibong Baek),조승환(Seunghwan Cho) 한국추진공학회 2014 한국추진공학회 학술대회논문집 Vol.2014 No.12
다양한 형태의 추진 시스템에서 유체 제어용으로 적용되고 있는 솔레노이드는 자성소재를 이용해 만든 보빈에 코일을 감고, 코일의 바깥쪽 주위에 자성소재로 만든 C자 형태의 프레임인 요크를 붙여 보빈과 요크를 흐르는 폐루프 자속을 얻는다. 본 연구에서는 보빈의 중간에 비자성소재를 삽입하여 폐루프 자속이 아마추어를 통과하게 함으로써 액추에이터의 구동력인 흡인력을 얻는 형태의 솔레노이드에 대해 전자기 해석을 수행하였으며, 삽입된 비자성소재의 길이를 따른 흡인력의 변화를 비교해 나타내었다. A solenoid being applied as for fluid control in various types of propulsion systems obtains closed-loop magnetic flux flowing through the bobbin and the yoke by winding a coil around a bobbin made with a magnetic material and attaching a yoke, the C-shaped frame made with a magnetic material around the outside of the coil. In this study, we carried out the electromagnetic analysis on the solenoid of the type obtaining attraction force, the driving force of an actuator by inserting a non-magnetic material in the middle of a bobbin and allowing closed-loop magnetic flux to go through the armature and compared the changes in attraction force depending on the length of the inserted non-magnetic material.
재생냉각식 액체로켓엔진의 연소기 형상 결정을 위한 예비 설계 방안
손민(Min Son),서민교(Minkyo Seo),구자예(Jaye Koo),조원국(Wonkook Cho),설우석(Wooseok Seol) 한국추진공학회 2010 한국추진공학회 학술대회논문집 Vol.2010 No.11
재생냉각식 액체로켓엔진의 예비 설계 단계에서 연소기 형상을 결정하기 위한 설계 방안을 제안하였다. CEA에서 예측된 연소 후 가스 물성치를 이용하여 로켓의 성능 및 재생냉각 성능을 계산하였다. 요구 추력, 연소실 압력, 주위 압력, 추진제 혼합비에 대해 1차원 관계식과 경험식으로 최적 유량과 연소기 성능을 예측하고, Rao 노즐 설계 기법을 활용하여 최종적으로 연소기 형상을 결정할 수 있는 방안을 제시하였다. A design plan was proposed for determining combustor configuration of regenerative- cooled liquid rocket engine in the process of preliminary design. Rocket performance and regenerative cooling results were calculated using the properties of combustion gas estimated in CEA. For required thrust, chamber pressure, atmosphere pressure and propellant mixture ratio the mass flow rate of propellants and combustor performance were predicted using one-dimensional and experimental equations. Finally, determinable plan for contour of combustor were presented through Rao nozzle design method.
이현정(Hyunjung Lee),서민교(Minkyo Seo) 한국인터넷전자상거래학회 2015 인터넷전자상거래연구 Vol.15 No.6
In recent years, the foreign direct online sales through online shopping malls has continuously increased in South Korea and China because in particular a number of Chinese consumers have purchased Korean products including clothes and fashion items and hence, this paper looks at online market in China. The purpose of this paper is to examine the current movement of the foreign direct online sales and to propose several recommendations for the development of the foreign direct online sales of Korean small and medium-sized firms and for the growth of our nation"s economy. Therefore, first of all, this paper focuses on the present movement of e-Commerce in China and on the current movement of the foreign direct online sales in South Korea. Furthermore, this paper examines several Korean small and medium-sized firms, which have successful online shopping malls related to the foreign direct online sales, to explain the important points for the development of the foreign direct online sales. Also, this paper proposes several recommendations for the growth of the foreign direct online sales in China and then, this paper draws conclusions. To conclude, it is necessary to create global online shopping malls, to support promising small and medium-sized firms, to make effective logistics and simple payment systems and to have government aids in order to promote the foreign direct online sales.