FEA와 다이나모메터를 이용한 자동차 디스크 브레이크의 열적 거동에 관한 연구

박범식,손영지,장성규,전언찬 한국공작기계학회 2000 한국공작기계학회 추계학술대회논문집 Vol.2000 No.-

While braking cars, a large amount of energy is taken into the brake system in a short period of time. This leads to some problems ; cracking of the disc, non-uniform wear of pad and disc, fade. Thus it is important to measure the contact thermal behaviour precisely between disc and pad. The measurements must be considered to design the brake system. The paper describes methods to analysis the problem of the thermal behavior on the ventilated disc with ANSYS-a program of FEA and a brake dynamometer. According to this way, the paper can present the error between the data by the dynamometer and the results of analysis by ANSYS.

균류 분화과정의 유전적 조절기작

박범찬,이환희,박윤희,박희문 충남대학교 생물공학연구소 2003 생물공학연구지 Vol.9 No.1

Fungi are well suited for studying mechanism controlling development and cell differentiation in multicellular eukaryotes. The asexual and sexual reproductive cycles are tightly coordinated during the life cycle of Aspergillus nidulans. The asexual (mitotic) reproductive cycle involves the formation of a number of differentiated cell types. Successful formation of multicellular reproductive structures and spores (conidia) requires the establishment of spatiotemporal gradients in essential transcriptional regulators, such as brlA, abaA and wetA. Altered gene expression is coordinated with critical changes in the movement of nuclei and the regulation of the cell division cycle. Therefore, it has been proposed to define a central regulatory pathway. Several early regulatory genes involved in signal transduction pathway controlling asexual sporulation are also required for activating the central pathway. Sexual (meiotic) reproduction is more complex, requiring the differentiation of several specialized tissue types. Although technical difficulties have limited efforts to study the genetics of sexual fruiting-body formation directly, some recent progress has been made. With the recent availability of mutants blocked in sexual development, understanding the genetic interactions between genes that function primarily in determining sexual sporulation will be achieved in the near future.

건축법규 변화에 따른 다가구주택의 특성에 관한 연구

박기범,최찬환 대한건축학회 2003 대한건축학회논문집 Vol.19 No.4

Despite the importance of multifamily housing, which can be found easily in all parts of residential area with imaginable guise, as a major supply of affordable housing, the public prohibited people from living two more families in single detached house and regarded it as illegal until 1980s. But illegal multifamily housing was diffused throughout Seoul as open secret and too late the public legitimated it rather than banning conversions from single detached housing to multifamily housing. From the start of 1990s, most of multifamily housing were pioneered not by leading architects but by the local builders, so the Building Code was at the top of the list which affects multifamily housing. This study focuses on the relation between the characteristics of multifamily housing and the building code in residential area. The legitimation of multifamily housing enabled multifamily housing to place on the plot for single detached house and changed the landscape of residential area. The physical form of multifamily housing was affected not only by the change of regulations but also by the conditions of urban tissue like plot, street, adjacent building, and typography. The enforcement of regulations like parking lot affected the layout and form of housing directly but the alleviation like height and volume manifested under the influence of urban tissue. The change of regulation and urban tissue are manifested in the form of multifamily housing.

수종의 섬유보강재가 복합레진의 파절강도에 미치는 영향

박지만,조용범,홍찬의 대한치과보존학회 2000 Restorative Dentistry & Endodontics Vol.25 No.3

The effect of fiber reinforcing materials on the fracture strength of composite resin was evaluated. Each ten composite resin bars reinforced by glassfiber [Fiber-Splint MLR(polydentia SA. Switzerland)], polyethylene fiber [Ribbond R Ribbond Inc., U.S.A)] and polyaramid fiber [Kevlar R(DuPont U.S.A.)]were loaded under the 3-point compression technique. Another ten pure composite resin bars without reinforcement were used as a control group. Then mean fracture strength and standard deviation were calculated and a ANOVA and Scheffe test were used in statistics. The results were as follows: 1.Kevlar group showed the highest fracture strength as 175.5MPa (p〈0.05). Fiber-splint ML group showed the lowest fracture strength as 112.7MPa. 2.The mean value of fracture strength in Ribbond group was 136.4MPa, and that of ulcerated control group was 143.6MPa. No difference was found between the two groups. 3.Ribbond and Kevlar reinforcement groups showed a catastrophic failure, where complete separation of pieces occurs to a unaspirated fracture pattern. The use of Kevlar reinforcement fibers with composite resin showed significant increase in the average load failure and the presence of the fibers did prevent the catastrophic crack propagation present in the unreinforced samples. The use of Ribbond reinforcement fibers with composite resin showed no significant increase in the average load failure. However, the presence of the fibers did prevent the catastrophic crack propagation. Because high strength of glassfiber are rapidly degraded on exposure to moisture and humidity. The use of Fiber-splint ML reinforcement fibers with composite resin showed significant decrease in the average load failure and displayed catastrophic fractures.

건축제도 변화에 따른 일반주거지 도시조직에 관한 연구

박기범,최찬환 대한건축학회 2003 대한건축학회논문집 Vol.19 No.10

The rapid industrialization and urbanization gave rise to the shortage of urban housing from the mid of 1900s. To solve housing problem the public policy, which was to increase housing supply, focused on the private movement like subdivision of single detached housing for multi households. Illegal multifamily housing was legitimated and then enlarged in volume, height, and density. But the introduction of multifamily housing as an urban housing did not considered the differences of urban structure which was different according to the land readjustment project. There are some differences in housing form according to the relation between Building Code and the conditions of urban structure. This study focuses on the analysis of urban tissue reflecting interrelation between residential structure and Building Code. To find out the relation between Building Code and urban structure manifested in the form of multifamily housing is the best way understanding urban tissue of residential area. The change of building code has led the change of housing form, conditions of urban structure has affected the differences of housing form from the 1990. From the research, under the same legislation there are differences in volume of housing according to the condition of plot like size and border with street, under the same residential structure the differences of regulation affected the form of housing. So understanding urban tissue is the key to organize appropriate landscape of residential area.

EU와 한국의 IT를 통한 에너지효율화 정책 비교 연구

이각범,박찬국,용태석 한국정보사회진흥원 2008 정보화정책 Vol.15 No.3

에너지 효율화를 이루기 위해 세계 각국은 IT 인프라를 적극 활용하고 있다. 특히, EU는 에너지와 IT의 융합 범위를 지속적으로 확대하고 있고, 참여와 협력을 기반으로 공동연구과제를 추진해오고 있다는 점에서 주목할 만하다. 반면, 우리나라의 경우 IT를 통한 에너지 효율화 연구주제는 전력분야에 국한되어 있으며, 에너지 융합 논의가 아직 초기 단계에 머물러 있다. 본 연구에서는 EU와 우리나라의 IT를 통한 에너지 효율화 정책을 연구주제 선정 과정 및 연구개발 범위와 추진방향, 에너지와 IT 두 부문의 유기적인 연계성, IT확산에 따른 리스크 대응 측면에서 비교 분석하고, 국내의 IT와 에너지 간 융합 전략을 설정함에 있어 시사점을 도출한다. 앞으로 IT를 통한 에너지효율화 정책은 에너지 정책과 정보화 정책 간 긴밀한 연계성을 갖추어가야 하며, 차세대 IT를 어떻게 에너지 효율화에 접목시킬 것인가에 대해 그 기술도입의 우선순위와 응용범위를 구체화시켜 나가야 한다. 또한, 에너지 부문에 정보화가 확산되면서 나타나는 부작용과 위험요소 등에 적극 대응하면서 에너지산업의 성장 동력화를 위한 인프라를 갖추어가야 한다. The world has been making active use of IT(information technology) infrastructure for the energy efficiency. Especially EU's energy informatization strategy is prominent in terms of i scope and systematicness, based on participation and collaboration. Korea, however, does research on energy-IT convergence focusing just on power grid and does not have a long history of research on energy-IT convergence. We carry out an in-depth study on comparing the energy efficiency policies of EU and Korea in terms of the R&D process, range, and direction. We try to draw implications in setting an strategy on the future convergence policy of energy and IT. The energy efficiency strategy and informatization strategy should be closely connected and policy makers should show concrete action plans to apply the next generation IT for energy efficiency. Furthermore the policy makers should pay attention to measures to cope with the risks stemming from energy informatization.

폐 내 병변으로 인한 소아 급성 호흡부전의 원인 질환과 예후

이혜영,박지숙,최희라,서지현,김점수,임재영,최명범,박찬후,우향옥,윤희상 대한소아과학회 2004 小兒科 Vol.47 No.5

RSA 암호화 알고리즘의 구현에 관한 연구

신인철,이민섭,박창섭,김범식,우찬일,최춘수 단국대학교 1998 論文集 Vol.33 No.-

Recently, the information exchange through a communication network has been increased rapidly. When the sensitive information being sent or stored, the cryptographic technique can be employed in order to prevent it from being exposed or modified by the illegal third party. To implement public key encryption systems based on the integer factorization and the discrete logaritm problem, an efficient exponential arithmetic is mandatory due to large numbers involved. In this paper, the general analysis about the high­speed implementation of primality testing and exponentiations are investigated as well as implementing RSA public­key system. The public­key cryptosystem can be applied to any applications which need both the privacy and the authentication. Finally, suing the software package named MIRACL which provides the basic number theoretic routines for cryptographic software developers. we have implemented the RSA encryption and decryption with Blum­Goldwasser probabilistic algorithm under various key and message size.

국소적 복막염으로 발현한 대나무 가지에 의한 위천공 1례

서지현,황지영,강기수,박찬후,우향옥,최명범,윤희상 대한소아과학회 2001 小兒科 Vol.44 No.7

Bit Error Probability of a Hybrid DS / FFH Spread-Spectrum System over an AWGN Channel with Multiple-Tone Jamming

Chan Bum Park,Jae Hong Lee 대한전자공학회 1992 JC-CNSS : Joint Conference on Communications, Netw Vol.5 No.-