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EIA-709.1 Control Network Protocol을 이용한 필드버스 시스템 구현
최병욱,김정섭,이창희,김종배,임계영 제어·자동화·시스템공학회 2000 제어·자동화·시스템공학논문지 Vol.6 No.-
EIA-709.1 Control Network Protocol is the basic protocol of LonWorks systems that is emerging as a fieldbus device. In this paper, the protocol is implemented by using VHDL with FPGA and C program on an Intel 8051 processor. The protocol from the physical layer to the network layer of EIA-709.1 is implemented in a hardware leval. So it decreases the load of the CPU for implementing the protocol. We verify the commercial feasibility of the hardware through the communication test with Neuron Chip, based on EIA-709.1 protocol, which is used in industrial fields. The developed protocol based on FPGA becomes one of IP and we are able to implement SOC for the terminal device in the distributed control systems. Also, the result can be applicable to various industrial field because it is implemented by VHDL.
김창훈,김엄기,전용두,이금배,남승훈,안병욱 한밭대학교 생산기반기술연구소 2003 생산기반기술연구소 논문집 Vol.3 No.1
The erosion behavior of artificially aged HK40 steel was invested. Erosion tests were conducted at room temperature, 200℃ and 400℃ using Al_2O_3 particles. Erosion rates increased with the increment of temperature. The maximum erosion rate appeared with the impingement angle of 30 degree. The erosion rate increased, reached the maximum at 1000 hours, and after that, decreased with the heat treatment time. The mechanism of erosion seems to be the cutting wear which is very much associated with the strength of material. As results, the erosion rates were rather affected by the tensile strength and the strain hardening coefficient than the hardness and the yield strength. Such changes of material properties would be caused by the change of micro-structure due to the precipitation of carbide and the dissolution of solid element within matrix during the heat treatment.
알코올 용매로부터 알콕사이드졸겔법에 의한 알루미나 미분말의 제조
김창은,이해욱,안용진,김배연 연세대학교 산업기술연구소 1989 논문집 Vol.21 No.1
Al(??)₃를 알코올 용매하에 아세틸아세톤과 반응시킨 후 부분가수분해 하여 alumina precusor sol을 얻었다. 생성된 졸의 특성을 알아보기 위하여 산의 농도에 따른 졸의 상태를 조사하였다. 또한 이 졸로부터 얻어진 분말은 각 온도별로 열처리하여 결정의 전이과정 및 각 온도에서의 결정상태 등을 조사하였다. 건조분말은 90℃에서 비정질로서 polymenc sol의 특성을 나타내었으며 900℃에서는 ? -Al₂O₃, 1050 ℃에서는 α- Al₂O₃의 단일상이 각각 관찰되었다. 또, 비정질분말과 α- Al₂O₃에서는 6배위한 Al을, 그리고 ??-Al₂O₃에서는 4배위한 Al을 각각 확인할 수 있었다. Alumina precusor sol was obtained by the reaction of Al(??)₃ and acetylacetone in the alcohol solvent followed by the partial hydrolysis. In order to investigate the characteristics of the obtained sol, the state of the sol with the concentration of the acid was investigated. The powders obtained from this sol were calcined at the various temperatures. The transition of crystals and crystal state were investigated at the various temperatures. The powders dried at 90 ℃ showed the characteristies of polymeric sol and at 900℃ showed ??-Al₂O₃, at 1050℃ showed the single phase of α-Al₂O₃.
FIDIC 계약조건과 국내계약조건의 클레임 관련조항 비교 연구
이동욱,김창학,이배호 중앙대학교 기술과학연구소 1998 기술과학연구소 논문집 Vol.28 No.-
본 연구는 건설시장 개방에 따른 표준계약조건을 정립하기 위해 FIDIC 제정 계약조건과 국내에서 계약조건으로 적용되는 관련법규의 내용을 문헌조사를 통해 비교ㆍ검토하였다. 국내계약조건은 공사관련 사항을 여러 법규에 산발적으로 규정하고 있어 비정형성을 보이고 있으며, 책임기준 또한 모호하며, FIDIC 조건과의 비교분석에서 알수 있듯이 세부적ㅇ니 면에서 많은 차이점을 보이고 있어 클레임의 발생가능성이 높음을 알 수 있었다. 또한 클레임과 분쟁의 처리절차에 있어서 국내계약조건은 클레임의 제기, 감리자의 책임과 권한, 클레임의 유효성 기준, 클레임의 처리절차에 대한 규정이 미비한 실정임을 알 수 있었다. 또한 FIDC 계약조건의 분석을 통하여 시공자가 제기할 수 있는 클레임 사항을 본 연구에서는 제시하고 있다. IN this study, with a purpose to establish the standard construction contract conditions, the FIDIC conditions of contract and the corresponding legal systems from the various domestic laws and regulations, used as the construction conditions, were compared. The study shows problems such as inconsistence and atypicality between current provisions and FIDIC contract. The possibility of claim occurrence in Korea construction market is significant. Through a comparison of domestic and foreign construction contract, the study presents that domestic contracts don't have provisions about procedure of submission, engineer's responsibility and authority, and effective procedure of claims. The study also presents technical considerations under the FIDIC Contract by Employer and Contractor.
Park, Hye-Jee,Park, Chang-Jin,Bae, Nahee,Han, Sang-Wook The Korean Society of Plant Pathology 2016 Plant Pathology Journal Vol.32 No.3
A bacterial tyrosine sulfotransferase, RaxST, is required for activation of rice XA21-mediated immunity, and it catalyzes sulfation of tyrosine residues of Omp1X and RaxX in Xanthomonas oryzae pv. oryzae, a causal agent of bacterial blight in rice. Although RaxST is biochemically well-characterized, biological functions of tyrosine sulfation have not been fully elucidated. We compared protein expression patterns between the wildtype and a raxST knockout mutant using shotgun proteomic analysis. Forty nine proteins displayed a more than 1.5-fold difference in their expression between the wildtype and the mutant strains. Clusters of orthologous groups analysis revealed that proteins involved in cell motility were most abundant, and phenotypic observation also showed that the twitching motility of the mutant was dramatically changed. These results indicate that tyrosine sulfation by RaxST is essential for Xoo movement, and they provide new insights into the biological roles of RaxST in cellular processes.
( Ji Young Kim ),( Chang Wook Kim ),( Yun Hui Kim ),( Seok Cheon Yeom ),( Su Gyeong Lee ),( Hee Yeon Kim ),( Si Hyun Bae ),( Jong Young Choi ),( Seung Kew Yoon ) 대한간학회 2016 춘·추계 학술대회 (KASL) Vol.2016 No.1
Aims: Immune regulatory molecules such as forkhead box P3 (Foxp3) on CD4+ T cell and cytotoxic T lymphocyte-associated antigen 4 CTLA-4) on CD8+ T cell are associated with antiviral effector T cell dysfunction, which influences on T cell exhaustion and persistent viral infection in patients with chronic hepatitis B. These Foxp3 and CTLA-4 are up-regulated in chronic hepatitis B. During antiviral therapy with tenofovir, the expressions of Foxp3 and CTLA-4 could be changed. We investigated the relationship between antiviral effects of tenofovir and the expression of Foxp3 and CTLA-4 during tenofovir treatment in chronic hepatitis B. Methods: Eight patients with chronic hepatitis B under tenofovir treatment were enrolled for detection of Foxp3 on CD4+ T cell and CTLA-4 on CD8+ T cell. Peripheral blood mononuclear cells were isolated from these subjects before tenofovir treatment (T0), 3 month (T3) and 6 month (T6) during tenofovir treatment. For antiviral effect analysis, serum HBV DNA levels were checked at same time. The expressions of Foxp3 and CTLA-4 on T cells were monitored by flow cytometry. Results: Three patients (3 of 8) showed marked decreases of Foxp3 and CTLA-4 during tenofovir therapy (group 1). Five patients (5 of 8) showed minimal changes of Foxp3 or CTLA-4 during tenofovir therapy (group 2). Group 1 showed complete virologic response within 6 month therapy regardless of baseline HBV DNA level but, group 2 showed complete virologic response within 6 month therapy only in patients with low baseline HBV DNA level (< 7log HBV DNA). Conclusions: Among the patients with chronic hepatitis B, the patients who showed marked decrease of Foxp3 and CTLA-4 during tenofovir therapy are associated with strong antiviral effects of tenofovir regardless of baseline HBV DNA level. This finding suggests that restoration of HBV-specific T cell strengthens the antiviral effects of tenofovir.