에폭시수지가 도포된 폴리이미드와 스크린 프린팅 Ag 사이의 계면접착력 평가

박성철,김재원,김기현,박세호,이영민,박영배,Park, Sung-Cheol,Kim, Jae-Won,Kim, Ki-Hyun,Park, Se-Ho,Lee, Young-Min,Park, Young-Bae 한국마이크로전자및패키징학회 2010 마이크로전자 및 패키징학회지 Vol.17 No.1

스크린 프린팅된 Ag 박막과 에폭시 수지로 코팅된 폴리이미드 사이의 계면접착력을 $180^{\circ}$ 필 테스트를 통해 정량적으로 구하였다. 스크린 프린팅된 Ag 박막과 에폭시 수지 코팅된 폴리이미드 사이 필 강도는 $164.0{\pm}24.4J/m^2$이었다. 오븐에서 $120^{\circ}C$ 조건에서 24시간 동안 열처리 한 Ag/폴리이미드의 필 강도는 $220.8{\pm}19.2J/m^2$로 증가하였고, $85^{\circ}C/85%$ 상대습도 조건에서 120시간 동안 유지한 Ag/폴리이미드의 필 강도는 $84.1{\pm}50.8J/m^2$로 감소하였다. 전계방출형 주사전자현미경과 XPS를 통해 박리된 시편 표면을 분석한 결과, 열처리 및 고온/다습조건처리 시 스크린 프린팅 Ag 박막과 에폭시 수지 코팅층 사이의 계면접착력은 에폭시 수지와 수분 사이의 가수분해 결합 반응으로 인해 계면접착력 증가 및 감소하는 경향과 밀접한 연관성이 있는 것으로 판단된다. The interfacial adhesion strengths between screen-printed Ag film and epoxy resin-coated polyimide were evaluated by $180^{\circ}$ peel test method. Measured peel strength value was initially around $164.0{\pm}24.4J/m^2$, while the heat treatment during 24h at $120^{\circ}C$ increase peel strength up to $220.8{\pm}19.2J/m^2$. $85^{\circ}C/85%$ RH temperature/humidity treatment decrease peel strength to $84.1{\pm}50.8J/m^2$, which seems to be attributed to hydrolysis bonding reaction mechanism between metal and adhesive epoxy resin coating layer.

고효율 효소를 분비하는 균주의 선발 및 신문고지의 효소탈묵 특성(제5보) - Bacillus sp.에서 단리한 Cellulase와 Xylanase의 특성 -

박성철,이양수,정인수,Park, Seong-Cheol,Lee, Yang-Soo,Jeong, In-Soo 한국펄프종이공학회 2005 펄프.종이기술 Vol.37 No.3

This study was carried out to investigate the characteristics of extracellular cellulase and xylanase from 4 selected different species, such as enzyme activity and stability by pH, temperature and metal ions, for application into enzymatic deinking system. The optimal temperature and pH for enzyme activity of Bacillus pumilus I, B. subtilis I, B. pumilus II and B. subtilis II were mainly $40{\sim}60^{\circ}C$ and pH $6.0{\sim}7.0$, respectively. Certain metal ions, calcium and cobalt, elevated enzyme activity, even though there were different results of enzyme activities based on various metal ions in 4 different species. With these results we suggest that enzymatic deinking system should be proceed at $50^{\circ}C$ with neutral pH condition.

고효율 효소를 분비하는 균주의 선발 및 신문고지의 효소탈묵 특성(제2보) -Cellulase와 Xylanase를 생산하는 Fungi의 분리 및 선발-

박성철,강진하,이양수,Park Seong-Cheol,Kang Jin-Ha,Lee Yang-Soo 한국펄프종이공학회 2004 펄프.종이기술 Vol.36 No.3

The useful fungi which secret extracellular enzymes was selected for deinking agent of old newsprint. Five fungal strains were isolated from a paper mill soil ground. The CMCase, FPase and xylanase activities of fungi on the liquid culture were investigated at optimal growth conditions. The results of this study were as follow: The optimal pH and temperature for culture growth were 4~8 and 27~$35^{\circ}C$, respectively. For screening of extracellular enzymes at optimal culture conditions the optimal culture period were less than 6-7 days. Fusarium pallidoroseum and Aspergiilus niger which shows relatively higher CMCase, FPase and xylanase activities than the other species were selected for further enzymatic deinking research.

과학기사에 대한 새로운 패러다임

박성철,Park, Seong-Cheol 한국과학기술단체총연합회 2008 과학과 기술 Vol.41 No.5

과학칼럼-정치부기자와 과학담당기자

박성철,Park, Seong-Cheol 한국과학기술단체총연합회 2007 과학과 기술 Vol.40 No.7

네트워크 포트스캔의 위험에 대한 정량화 방법

박성철,김준태,Park, Seongchul,Kim, Juntae 한국시뮬레이션학회 2012 한국시뮬레이션학회 논문지 Vol.21 No.4

네트워크 포트스캔 공격은 내부 네트워크에 있는 시스템에서 열려 있는 포트를 알아내기 위한 방법이다. 기존 대부분의 침입탐지시스템(Intrusion Detection System; IDS)들은 단위 시간당 시스템 또는 네트워크에 몇 번의 패킷을 보냈는지의 횟수를 기록하여 전송한 패킷의 횟수가 임계치보다 높은 소스 인터넷 주소(source IP address)에 대해서 포트스캔 공격이 수행되었다고 간주하였다. 즉, 네트워크 포트스캔 공격을 수행한 소스 인터넷 주소에 대한 위험 정도는 IDS들이 기록한 포트스캔 공격횟수에 의존하였다. 그러나 단순히 포트스캔 공격 횟수에 기반을 둔 위험성의 측정은 느린 포트스캔 공격에 대해 거짓 부정(false negative)이 높아져 포트스캔 탐지율이 낮아진다는 문제가 있다. 본 연구에서는 네트워크 포트스캔 공격에 대해 좀 더 정확하고 포괄적인 구분을 하기 위해 4가지 형태의 정보를 요약한다. 포트스캔 공격에 대한 위험성을 집약적으로 나타내기 위하여 주성분분석(principal component analysis, PCA)에 의해 이러한 정보들을 정량화한 위험지수를 제안한다. 실험을 통해 제안한 위험지수를 이용한 탐지가 포트스캔 탐지율에 있어서 Snort보다 우수하다는 것을 보인다. Network port scan attack is the method for finding ports opening in a local network. Most existing IDSs(intrusion detection system) record the number of packets sent to a system per unit time. If port scan count from a source IP address is higher than certain threshold, it is regarded as a port scan attack. The degree of risk about source IP address performing network port scan attack depends on attack count recorded by IDS. However, the measurement of risk based on the attack count may reduce port scan detection rates due to the increased false negative for slow port scan. This paper proposes a method of summarizing 4 types of information to differentiate network port scan attack more precisely and comprehensively. To integrate the riskiness, we present a risk index that quantifies the risk of port scan attack by using PCA. The proposed detection method using risk index shows superior performance than Snort for the detection of network port scan.

미디어로 만나는 과학기술 - 스스로 권위 내던지는 언론과 유사과학

박성철,Park, Seong-Cheol 한국과학기술단체총연합회 2009 과학과 기술 Vol.42 No.2

한국인에서의 연령 및 성별에 따른 안압-단면적 연구

박성철,기창원,Sung Chul Park,Changwon Kee 대한안과학회 2008 대한안과학회지 Vol.49 No.1

`Purpose: To assess the effect of age and gender on intraocular pressure (IOP) in a large Korean population. Methods: This cross-sectional study included 102,218 healthy Koreans who were aged between 20 and 79 and had no preexisting ocular conditions that could affect the IOP. All the subjects had undergone a physical check up between 1996 and 2005, and their medical records were reviewed retrospectively. Anthropometric measurements, blood tests, noncontact tonometry, and fundus examination were performed on all participants. Subjects were grouped according to decade of age. For all subjects and each age group, age and systemic variables were analyzed by multiple regression analysis on their relationship with IOP. Results: A significant trend of decreasing IOP was observed in the 40s, 50s, and 60s in men, while a significant trend of increasing IOP was found in the 50s, 60s, and 70s in women. Multiple regression analysis revealed different IOP trends with age between age groups in both men and women. In general, the IOP had a significant positive correlation with systolic blood pressure, body-mass index (BMI), hematocrit, and serum cholesterol, especially with BMI in men and hematocrit in women. Conclusions: In a multiple regression analysis, the IOP trend in each age group was quite different from each other in a large Korean population, and it was suggested that women may have a steeper increasing slope (or less steep decreasing slope) of IOP with age than men. Further investigations with longitudinal study would be required to clarify the age- and gender-related physiologic changes of IOP.`

재활용 황산니켈의 국내·외 품질기준현황 및 생산제품의 전해도금 성능 비교

박성철,김용환,신호정,이만승,손성호,Park, Sung Cheol,Kim, Yong Hwan,Shin, Ho Jung,Lee, Man Seung,Son, Seong Ho 한국자원리싸이클링학회 2021 資源 리싸이클링 Vol.30 No.3

In Korea, a good recycled product (GR) certification system was introduced in 1997 to improve resource and energy use efficiency. However, in industry and society, recycled products are not used well because of the lack of awareness of recycled materials. In this study, the status of domestic and international quality standards for nickel materials was investigated, and the purity and electrochemical properties of nickel sulfate prepared from ore and nickel sulfate recovered from waste lithium-ion batteries were evaluated during the electroplating process. As a result of the test, it was found that there is no quality difference between recycled nickel sulfate and high-purity nickel sulfate reagents when used in the electroplating industry.

학교 내 안전체험교실의 시설모형 개발 연구

박성철,안유정,송병준,조진일,Park, Sung-Chul,Ahn, Yoo-Jeong,Song, Byung-Joon,Cho, Jin-ll 한국교육녹색환경연구원 2017 교육·녹색환경연구 Vol.16 No.2

본 연구는 교육부, 학교현장, 건축가, 기업 등 관련 기관의 정책수립, 운영계획수립, 시설건립 등 다양한 사업추진과 밀접한 관계가 있는 '안전체험교실 시설모형을 개발'하기 위하여 안전체험교실에 적용하기 위한 필수 교육프로그램을 도출하고 단위공간 조성과 이에 대한 구성요소 및 활용방안을 제시하는데 목적이 있다. 본 연구는 5단계로 내용을 구성하였다. 첫째, 안전교육 수행 및 시설계획 기본방향과 관련한 문헌을 분석하였으며, 둘째, 공간규모, 시설구성 등 공간조성 실태와 운영실태분석을 바탕으로 안전교육 체험교실 실태를 조사하였다. 이를 기반으로 기존 안전체험교실의 장 단점을 분석하고 델파이 조사 및 전문가 참여디자인을 통하여 5가지의 시설모형(안)을 개발하였다. 최종적으로 개발된 안전체험교실 시설모형(안)은 1) 교통안전(보행안전, 차량안전, 지하철안전) 2) 응급처치(응급구조, 신고요령) 3) 재난안전(화재 대피안전, 지진 생활안전) 4) 승강기안전(승강기안전, 에스컬레이터안전) 5) 약물 및 폭력안전(흡연 음주안전, 성폭력안전, 식품안전)에 대한 체험존과 각 영역의 세부 안전체험공간이다. 이러한 과정을 통해 개발된 안전체험교실 시설모형(안)은 학교현장의 수용 가능한 공간적 규모에 따라 각 모형을 조합 또는 분리하여 안전체험교실을 조성할 수 있을 것이다. The purpose of this study is to derive education programs for safety training class, create unit spaces and present components and methods of utilizing the spaces for the development of facilities models closely related to various policy, operation plan and facility construction projects promoted by related institutions such as the Ministry of Education, schools, architects and companies. This study is divided into five steps. First, we reviewed the literature related basic directions for safety education and facility plan, second, field survey included both field conditions such as spatial size and facility configuration and analysis of operating conditions like hours of operation and personnel. Base on literature review and field survey, it were used to analyze strengths and weaknesses of existing safety training classes, and five facility models was developed based on the Delphi method and expert participatory design. The result show that the facility models (drafts) of safety training class were developed as follows: (1)the facility model for traffic safety(pedestrian safety, vehicle safety, subway safety) (2)the facility model for first aid(emergency rescue, how to report) (3)the facility model for disaster safety(fire evacuation safety, life earthquake safety) (4)the facility model for elevator safety(elevator safety, escalator safety) (5)the facility model for drugs and violence safety (smoking drinking, sexual harassment safety, food safety) The safety training class can be composed by combining or separating each module according to affordable space size of each school.