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박정수,윤신숙,윤미경,전근호,남정이,Park, Jung Soo,Yoon, Shin Sook,Yun, Mi Kyung,Chun, Keun Ho,Nam Shin, Jeong E. 대한화학회 1998 대한화학회지 Vol.42 No.5
Campylobacter jejuni 그램 음성균의 O-antigen 부위를 구성하는 반복 단위 삼탄당 합성의 주요 중간체인 이당류들을 글루코스아민 주게와 갈락토스 받게를 ${\beta}(1{\rightarrow}3)$ 클리코시드 결합으로 연결함으로서 합성하였댜. 이들의 합성 과정에서 갈락토스 당 부위의 2, 3, 4 번 OH기들의 글루코스아민 받게에 대한 높은 위치선택성이 발견되었으며 이를 이용하여 2, 4번 OH에 대한 선택적 보호과정을 생략할 수 있었고 결과적으로 합성과정을 단축시킬 수 있었다. O-Antigenic part of Campylobacter jejuni gram negative bacteria was reported to consist of a repeated trisaccharide unit. The disaccharides, GlcNAc-Gal derivatives, as key intermediates for the synthesis of trisaccharide repeating units were synthesized. At the $\beta(1{\to}3)$ glycoside bond formation step between 3,4,6-tri-O-acctyl-2-deoxy-2-N-phthalimido-${\beta}$-D-glucopyranosyl bromide and galactosyl acceptors, high regioselectivities between 2, 3, and 4-OH groups of galactosyl acceptors were found. As a result, no further selective protection steps for OH groups of galactosyl acceptors was necessary, and more effective and compact synthetic scheme was achieved.
박정수,이규탁,조정호,정영훈,백종후,윤지선,Park, Jung Soo,Lee, Ku Tak,Cho, Jeong Ho,Jeong, Young Hun,Paik, Jong Hoo,Yun, Ji Sun 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.6
$0.97Bi_{0.5+x}(Na_{0.78}K_{0.22})_{0.5-3x}TiO_3-0.03LaFeO_3$ lead-free piezoelectric ceramics were fabricated by a solid state reaction method. $LaFeO_3$ additives were added to $Bi_{0.5}(Na_{0.78}K_{0.22})_{0.5}TiO_3$ for volatile compensation of bismuth and sodium ions in the sintering process. To create A-site vacancies, the mole ratio and charge valence of A-site ions ($Bi^{3+}$, $Na^+$ and $K^+$) were controlled. The improved piezoelectric properties were observed by addition of $LaFeO_3$ and control of A-site vacancies. In particular, a $d_{33}^*(S_{max}/E_{max})$ value of 614pm/V and an electric field induced strain of 0.33% was observed in $0.97Bi_{0.505}(Na_{0.78}K_{0.22})_{0.485}TiO_3-0.03LaFeO_3$ ceramic.
기비전 유기논과 관행논의 토양 화학 및 환경 특성 비교
박정수,왕용,강구,구본운,김한중,홍성구,홍승길,박성직,Park, Jeong-Soo,Wang, Long,Kang, Ku,Gu, Bon-Wun,Kim, Han-Joong,Hong, Seong-Gu,Hong, Seung-Gil,Park, Seong-Jik 한국농공학회 2015 한국농공학회논문집 Vol.57 No.6
Organic farming system has been considered environmental friendly and sustainable agricultural practice. However, the influence of organic farming on soil quality and environment is not well informed and controversial. We sampled and analyzed 0~15 cm and 15~30 cm depth soils of organic and conventional paddy fields in Yongin and Anseong. The electric conductivity and organic matter content of organic paddy soil were significantly less (p = 0.0097, 0.0067, respectively) than those of conventional paddy soil. Available phosphate and total phosphorus in 0~15 cm depth of organic paddy soil were $211.1{\pm}135.3$, $872.4{\pm}286.3mg/kg$, respectively, less than those of conventional paddy soil. Available phosphate amount in conventional paddy was $358.8{\pm}246.7mg/kg$, which is higher than 300 mg/kg that can cause secondary environmental contamination by runoff. The amount of total nitrogen in organic paddy soil was less than that in conventional paddy while their difference was not significant. The concentration of the heavy metals in organic paddy soil was also lower than that in conventional paddy soil but their difference was not statistically significant. Our findings demonstrate that electric conductivity, organic matter, nutrients, and heavy metals in organic paddy soil were less than those in conventional paddy soil. However, additional monitoring of soil properties for longer period is necessary to certify such a conclusion.
박정수,김성원,정영훈,윤지선,백종후,이성갑,조정호,Park, Jung-Soo,Kim, Seong-Won,Jeong, Young-Hun,Yun, Ji-Sun,Paik, Jong-Hoo,Lee, Sung-Gap,Cho, Jeong-Ho 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.12
To investigate excess $Na^+$ effect, $Bi_{0.5}(Na_{0.78+x}K_{0.22})_{0.5}TiO_3$ ($0{\leq}x{\leq}0.05$) (BNKT) ceramics were prepared by using a conventional solid-state reaction method. The structure and ferroelectric properties of BNKT ceramics were characterized by XRD (X-ray diffraction) and polarization dependence by external electric field. Also, the temperature dependence of dielectric constant and loss were studied. From these results, it was found that appropriate excess $Na^+$ into BNKT ceramics compensate the volatility and induce dense ceramics. The enhanced piezoelectric coefficient (158 pC/N) and depolarization temperature ($202^{\circ}C$) were obtained for the x=0.01 composition.
박정수,이규탁,윤지선,조정호,정영훈,백종후,Park, Jung Soo,Lee, Ku Tak,Yun, Ji Sun,Cho, Jeong Ho,Jeong, Young Hun,Paik, Jong Hoo 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.12
$Bi_{0.5+x}(Na_{0.78}K_{0.22})_{0.5-3x}TiO_3$ ceramics with an excess $Bi^{3+}$ and a deficiency of $Na^+$ and $K^+$ were synthesized by a conventional solid state reaction method. The structure and morphology of $Bi_{0.5+x}(Na_{0.78}K_{0.22})_{0.5-3x}TiO_3$ ceramics were characterized by X-ray diffraction and field emission scanning electron microscopy. The electric polarization and mechanical strain induced by external electric field, and the temperature dependence of dielectric constant were investigated. These results demonstrated that an ergodic relaxor phase can be induced by controls of the mole ratio of $Bi^{3+}$, $Na^+$ and $K^+$. A phase boundary between non-ergodic and ergodic relaxor phases can be observed at ambient temperature. The ergodic relaxor phase can be transferred to the ferroelectric phase by application of the electric field. The stability of the induced ferroelectric phases strongly depends on the mole ratio of $Bi^{3+}$, $Na^+$ and $K^+$. The maximum strain of 0.31% was observed in $Bi_{0.51}(Na_{0.78}K_{0.22})_{0.47}TiO_3$ ceramics sintered at $1,150^{\circ}C$ for 2 h.
공급업체 개발 활동과 성과에 대한 공급사슬 CSR 및 상생협력의 조절 효과에 대한 탐색적 연구
박정수 ( Jeong Soo Park ),장덕신 ( Chang Deok Shin ),김연성 ( Youn Sung ) 한국품질경영학회 2013 품질경영학회지 Vol.41 No.1
The purpose of this study was to investigate if purchasing companies` efforts of supplier development activities to supplier companies have positive impacts on the purchasing companies` performance as the first step. In the second step, we tried to confirm if the concept of Supply Chain Corporate Social Responsibility activities and Coexistence activities take the roles of moderate variable on relationship between supplier development and three performances respectively. Methods: The collected data through survey were analysed using multiple regression for the first step of the study and moderate regression for the second one of it. Results: The results of this study are as follows; supplier development efforts effect on all three performances positively. Moreover, Supply Chain CSR has significant moderate effect on relationship between supplier management and corporate performances, while Coexistence does between supplier management and logistics performances. In the case of relationship between supplier management and production performances, both Supply Chain CSR and Coexistence show significant moderate effect Conclusion: Manufacturing companies in Korea need to make effort of supplier development in selective way when they want to practice Supply Chain CSR and Coexistence concurrently considering strategies and objectives.
OpenSSL의 DLL 파일내의 AES 암호 알고리듬에 대한 오류 주입 공격
박정수(Jeong-Soo Park),김형동(Hyeong-Dong Kim),하재철(Jae-Cheol Ha) 호서대학교 공업기술연구소 2012 공업기술연구 논문집 Vol.31 No.1
AES(Advanced Encryption Standard)는 미국 연방 표준 암호 알고리듬으로서 메시지 암호화가 필요한 통신. 임베디드 장치, 데이터베이스 시스템. 전자 인증 등 여러 분야에서 사용되고 있다. 하지만. AES는 비밀 키가 내장된 하드웨어 장비에 구현되어 사용될 경우 한 번의 오류 주입으로도 비밀 키가 노출될 수 있는 취약점이 발견되었다. 한편 AES 알고리듬은 소프트웨어로 구현되어 사용될 수도 있는데 특히 오픈 소스인 OpenSSL 라이브러리에 포함되어 사용되고 있다. 본 논문에서는 OpenSSL 동적 라이브러리를 변조하는 오류 주입 공격 기법 으로 사용자의 비밀 키를 찾아낼 수 있음을 실험을 통해 보이고자 한다. fhe AES is a tTPo encryption standard algoritnm which is used to encrypt messages in secure communication, embedded device, database system, electronic authenticatkm and so on. However the AES algorithm is vulnerable to fault injection attack when it is used in hardware device including secret key. In spite of this weakness, the AES can be implemented in software method and especially included in OpenSSL library which is open source software. In this paper, we apply the fault injection attack to the OpenSSL library file and experimentally show that an attacker can extract the secret key of AES.
공급사슬관리에서 장기지향성과 자산특유성이 성과에 미치는 영향
박정수(Jeong-Soo Park),장덕신(Deok Shin Chang) 한국생산관리학회 2006 한국생산관리학회지 Vol.17 No.4
본 연구는 공급사슬관리에서의 ‘장기지향성’과 ‘자산특유성’이 공급사슬관리 성과와 생산성과에 미치는 영향을 살펴보는 것을 목표로 한다. 전국에 소재한 167개 제조업체를 대상으로 한 실증연구 결과, 장기지향성은 공급사슬관리 성과에 그리고 공급 사슬관리 성과는 생산성과에 유의한 영향을 미치는 것으로 분석되었다. 한편, 자산특유성은 두 가지 성과에 유의한 영향을 미치지 않는 것으로 나타났는데, 이는 자산특유성이 하나의 ‘기반’요인으로서 장기지향성을 통하여 간접적으로 두 가지 성과에 영향을 미친다는 설명을 가능하게 한다. 이러한 분석을 위하여 AMOS 프로그램과 구조방정식 모형이 활용되었다. We establish the model that confirm whether "long-term orientation" and "asset specificity" affect on supply chain management(SCM) performance and production performance. We confirm the model"s statistical significance with empirical investigation about 167 manufacturing companies of nationwide. As a result, we find that "long-term orientation" affect positively on SCM performance and SCM performance on production performance. In addition, "asset specificity" affects on the two performances via "long-term orientation," functioning as a "basis" factor. We prove these results with empirical method of structural equation model and AMOS program.