Analysis of the Operating Point and Fault Current Contribution of a PEMFC as Distributed Generation (DG)

문대성,강기혁,원동준,정일엽 대한전기학회 2009 Journal of Electrical Engineering & Technology Vol.4 No.3

Recently, hydrogen energy has been anticipated to change the paradigm of conventional power systems because it can expand sustainable energy utilization and conceptually provide remarkable flexibility to power system operation. Since hydrogen energy can be converted to electric energy through fuel cells, fuel cells are expected to play an important role in the future hydrogen economy. In this paper, a Proton Exchange Membrane Fuel Cell (PEMFC) is modeled as an equivalent circuit and its steady-state characteristics investigated using the model. PEMFCs can be connected to power systems through power conditioning systems, which consist of power electronic circuits, and which are operated as distributed generators. This paper analyzes the effects of the characteristics of the PEMFC internal voltages and investigated the dynamic responses of the PEMFC under fault conditions. The re-sults show that the fault current contribution of the PEMFC is different from those of conventional generators and is closely related to its operating point.

‘한국인의 이상향’ 이해를 위한 전통색채의 유심적 가치 연구

문대성 한국기초조형학회 2009 기초조형학연구 Vol.10 No.3

The spaces that we created until nowadays, used western color chart theory and developed based on that theory.  This western color theory chart is very functional and systematical but no human mentality and susceptibility are included.  Therefore, like a design trend in nowadays that based on susceptibility, it could be impossible to get more value from that theory.  This study is based on Korean’s traditional sensibility of color which work is to materialize the idealism of space.  In past time, susceptibility was the basis for color theory of Korea, and applied it by materializing these colors.  Thus, there is no diversity like western’s color chart, but we could include the meaning and function of color. This study also focused on getting psychologically idealized color through color functionality.  As space gradually developed, color that used is not only based functionalism, but pursuit for the color that is based human’s mental state and susceptibility. To develop the existing standard of traditional diversity of color and through human’s pursuit for basic materialization of color based on sensibility, this color fusion will provide new value of color to people who get tired of ordinary western’s color chart. 지금까지 우리가 만들어온 공간은 서양의 색상환을 이용한 다양한 이론으로 적용 발전 되어 왔다. 서양의 이러한 색 분류 작업은 무척 기능적이고 체계적이지만 인간이 갖는 심리적, 감성적 기준은 적용되어 있지 않고 있다. 때문에 현재처럼 감성을 중요시하는 디자인 트렌드에서 더 이상의 가치를 창출한다는 것은 불가능하다고 할 수 있다. 본 연구는 전통적인 한국인의 색채의식을 통해 공간이 지닌 이상향을 구체화시키는 작업이다. 과거 한국의 전통 색채에 있어서 기준은 인간의 감성이었으며, 이를 구체화 시켜 만들어진 색을 분류하고 적용하였다. 때문에 서양의 색상환이 갖고 있는 다양성은 없지만 색이 갖는 의미와 기능을 추가 할 수가 있었다. 본 연구에서는 이와 같은 색상의 감성적 기능에서 나타나는 심리적 이상향의 색상을 추출 하는데 있다. 이는 공간이 발전하면서 적용되어온 색채의 역할이 시각적 기능주의라는 틀에서 벗어나서 인간이 심리적으로 추구하고, 감성적으로 의지해온 색채의 역할을 구체화 할 수 있다. 기존의 기준이 되었던 다양한 전통색의 의미와 활용을 확대 발전시키고 이를 통해 인간이 추구하였던 근원적인 감성적 색채의 구체화는 서양의 색채에 지쳐있는 사람들에게 색의 퓨전으로서 새로운 가치를 제공하게 될 것이다.

전통적 공간구성에서 나타나는 심적 가치(心的 價値)의 적용에 관한 연구

문대성,김유림 한국기초조형학회 2006 기초조형학연구 Vol.7 No.4

傳統的 空間材料의 心的價値에 관한 硏究 : ‘살음 꼴’을 中心으로

문대성 한국공간디자인학회 2007 한국공간디자인학회논문집 Vol.2 No.2

서양의 건축이론과 공간 개념은 수세기 동안 인류에게 많은 발전과 영향을 미쳐왔다. 그러나 이는인간성 상실과 환경공해의 요소로 나타나 심각한 문제를 주기도 하였다. 때문에 현재 동양건축물에서 비롯한 정신적 요소를 접합한 퓨전형식의 다양하고 복합적인 미래공간은 이를 극복하기위한 새로운 요소로 떠오르고 있다. 그러나 한국전통 건축에서는 이미 이를 이용한 다양한 형태의 공간을 이미 적용하여 왔으며, 다른 동양 어느 나라와도 다른 의미와 방식을 독자적으로 구축하였고 이를 추구하였다. 본 연구에서 우리는 한국전통의 심리적 공간요소를 추출하였고, 이러한 가치를 ‘심적 가치’라 명명하였다. Western theory of Architecture and it’s space recognition have had enormous effect on mankind for centuries. However, that also brings several problems like loss of humanity and environmental pollution. For this reason, combining Eastern spiritual elements of Eastern Architecture to overcome these problems occurs as a new fusion element of various and complicated future space. Amazingly it’s been already investigated in Korean traditional architecture that a unique way of use of space has been built unlike other Eastern Architecture. We extract Korean spiritual space from Korean traditional architecture and we call it ‘Spiritual Value’ in our study.

An Efficient Selective Encryption of Fingerprint Images for Embedded Processors

문대성,정교일,문기영,반성범,정용화 한국전자통신연구원 2006 ETRI Journal Vol.28 No.4

Biometric-based authentication can provide a strong security guarantee of the identity of users. However, the security of biometric data is particularly important as any compromise of the biometric data will be permanent. In this paper, we propose a secure and efficient protocol to transmit fingerprint images from a fingerprint sensor to a client by exploiting the characteristics of the fingerprint images. Because the fingerprint sensor is computationally limited, a standard encryption algorithm may not be applied to the full fingerprint images in real-time to guarantee the integrity and confidentiality of the fingerprint images transmitted. To reduce the computational workload on the resource-constrained sensor, we apply the encryption algorithm to a nonce for integrity and to a specific bitplane of each pixel of the fingerprint image for confidentiality. Experimental results show that the integrity and confidentiality of the fingerprint images can be guaranteed without any leakage of the fingerprint ridge information and can be completed in real-time on embedded processors.

한국 전통공간에서 타자(他者)로서 심적 가치의 역할에 관한 연구

문대성 한국기초조형학회 2008 기초조형학연구 Vol.9 No.4

This study is to find value of ourselves that overcome the western materialism’s limitation and to apply this to a foundation. As this matter treated as a modern philosophy, ‘the other’ become an alternative for western materialism, and it’s time us to become a main role. ‘The other’ is for the men who create the history, in contrast, not like Jak Lakang’s regulation that prescribe women, to western it’s ‘the other’ but to Asian it’s a culture and history. Therefore, not just a western version of definition of ‘the other’, it will be the chance to redefine the meaning of ‘the other’ and also, it could be chance to find differences with western culture. This study inscribed this value as ‘Spiritual Value’. Spiritual Value of ‘The other’ is not to determine the form of space but determine the human form; moreover it has a structure of human and space that can communicate. Not even China and Japan has this kind of space structure, this structure could be only property that exist in Korea that has 5000 years of history. And this property could be the comparison to western’s materialism thoughts including formal and logical scientific value.

평생 스포츠로의 태권도에 대한 가능성 분석

문대성 한국스포츠리서치 2005 한국 스포츠 리서치 Vol.16 No.3

Anti-Aging Intravenous Therapy(AAIT; 항산화제주사) 처치와 복합비타민 섭취가 엘리트 태권도 선수의 피로 및 황산화 효소에 미치는 영향

문대성,정재우,김우규,신중달 한국스포츠리서치 2007 한국 스포츠 리서치 Vol.18 No.6

대학 교양체육 참여에 따른 자아존중감, 자기효능감과 정신건강과의 관계

문대성,현승권 한국웰니스학회 2012 한국웰니스학회지 Vol.7 No.2

The purposes of the study were to examine differences in the sub-domains of positive and negative psychological variables and as the demographic variables, and to identify the possible relationships between psychological variables and health related quality of life. The participants of the study included 292 university students who located in Nam-gu of Incheon Metropolitan City. The survey was analyzed by SPSS PC+ for window (version 17.0) which is the statistical analysis program to produce the computational results of this study. Based on the survey, this study could draw such results as follows: First, in the sub-domain of demographic variables, there was meaningful difference in gender, grade, health awareness, health conditions according to their positive psychological variables. Second, students and selected among the most domain showed a statistically meaningful correlation between positive psychological variables and negative psychological variables. Third, the most variables influenced by positive psychological variables.

태권도의 세계화를 위한 발전방안

문대성 동아대학교 스포츠과학연구소 2005 스포츠科學硏究論文集 Vol.23 No.-