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이훈재,장익훈 경운대학교 산업기술연구소 2000 産業技術硏究論文誌 Vol.3 No.1(B)
Among zero-suppression (AS) algorithms proposed for synchronous stream cipher system, ZS-1 has the difficulty on the implementation of the stream cipher system, ZS-2 has a weakness of channel error propagation, and ZS-3 has the complexity on the hardware. Because each algorithm must be chosen carefully to the application system, in this paper, we propose a criterion of the system adapted from the simulated results on the parameter changed.
침대평판형 전극에서 자계가 정극성 직류 코로나방전에 미치는 영향
박재윤,김익균,정장근,김정달,박상현 慶南大學校 附設 工業技術硏究所 1999 硏究論文集 Vol.17 No.-
본 연구실에서 실시한 자계가 인가된 다중 침대평판형 플라즈마 반응기에서 연소가스(NOx,SO₂)의 제거 효율에 관한 실험의 결과에서 자계를 인가한 경우의 제거 효율이 자계를 인가하지 않았을 때 보다 높은 것으로 나타났다. 따라서, 본 연구에서는 이와 같은 실험결과를 바탕으로 자계가 코로나 방전에 미치는 영향을 근본적으로 조사하기 위해 침대평판형 전극을 구성하여 정극성 직류전압을 인가하고 이때 형성된 전계방향과 직각방향으로 자재를 인가한 경우와 인가하지 않은 경우의 코로나방전 특성을 측정하고 분석하였다. 실험결과, 자계를 인가한 경우가 인가하지 않은 경우보다 파괴전압이 높고, 방전전류가 작으며, 방전영역이 넓은 것으로 나타났다. 또한 자속밀도가 증가함에 따라 절연파괴전압이 선형적으로 증가하였다. The effect of magnetic field on NOx and SO₂ removal characteristics from a combustion flue gas has been experimentally investigated for a DC corona discharge reactor with a multipoint-plate geometry. NOx and SO₂ removal efficiency by plasma reactor with magnetic field was much higher than that of plasma reactor without magnetic field. In this Paper, one needle-plate geometry discharge system with magnetic field at a right angle to the electric field was made. The corona discharge characteristics for this system was investigated and compared with the corona characteristics for the corona discharge system without magnetic field. As a results, breakdown voltage for the electric-magnetic hybrid system was higher than that for only electric field system and corona current with magnetic field was lower than that without magnetic field. Corona discharge zone with magnetic field was wider than that without magnetic field. Breakdown Voltage increased with increasing the magnetic field density.
시효전 템퍼링처리가 페라이트계 내열강의 미세조직과 기계적 성질에 미치는 영향
강창룡,김재환,김익수,서장현,배동수,이해우 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.5
This study investigated the effect of the tempering before aging on the precipitation of Laves phase and mechanical properties of 10Cr-6W and 10Cr-6W-3Co ferritic heat-resistant steels. Laves phase was precipitated by aging, which increase tensile strength but decreased elongation and impact value. Toughness was rapidly decreased by the presence of the very fine disk-like Laves phase precipitated at early aging stage. Strength and impact value were decreased by tempering treatment and that is due to the increase of the particle number per unite area and to larger particle size of Laves phase. Laves phase increased by adding Co, and consequently strength was increased and elongation and toughness were decreased. (Received February 26, 2004)
Fe-Mn-Si계 합금의 형상기억능에 미치는 변형온도 및 training 효과
강후원,한재익,장우양,강조원 조선대학교 생명과학연구소 2000 生産技術硏究 Vol.22 No.1
The shape memory effect is resulted from the reverse motion of Shockley partial dislocations which change εmartensite back to austenite. In Fe-Mn-Si alloys, the shape memory effect is obtained by the reverse transformation of stress-induced E martensite during heating. The reversibility of the motion of partial dislocations will not lead to a complete recovery. There are many factors influencing the shape memory effect like as alloy composition, Neel temperature, transformation temperature, applied stress and strain, annealing and quenching temperature, deformation and recovery annealing temperature etc. In this paper, shape memory effect by training treatment(cold working- annealing) and deformation temperature between -20℃ and 200℃ with amount of strain was improved in Fe-l5Mn-5Cr-10Co-3Si alloys Training treatment suppresses slip deformation and lower the stress for induced εmartensite transformation through introducing the stacking faults which can act as nucleation embryo for εmartensite.
오스테나이트계 스테인리스강의 진동감쇠능에 미치는 ε 마르텐사이트의 영향
손동욱,김재환,김익수,Miyahara Kazuya,성장현,강창룡 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.8
The effect of the phases of y, α' and ε martensites, which constitute the structure of the 316L stainless steel with austenite structure at room temperature, on the damping capacity at room temperature has been investigated. As a result, various fractions of these phases were formed depending on the degree of cold work. The largest volume fraction of a martensite phase is obtained by 20% cold rolling and showed the highest damping capacity. The damping capacity is strongly controlled by the volume fraction of ε martensite with linear relationship, while the other phases of α' and r have actually no effect on the damping capacity.
Jae-Ick Jang,Su-Min Kang 한국콘크리트학회 2019 International Journal of Concrete Structures and M Vol.13 No.4
The effects of flexural reinforcement and shear reinforcement on the punching shear strength of slab-column connections are analyzed in this study. For the study, six slab-column connection specimens were constructed with varying flexural reinforcement and shear reinforcement, and were subjected to gravity load tests. Experimental results showed that all specimens were destroyed by punching failure, and that the slab-column connection behaved differently depending on the amount of shear reinforcement and flexural reinforcement. Particularly, the flexural reinforcement in the slab-column connection improved the punching strength of the specimens with or without shear reinforcement. In addition, in this study, a design formula that considers the flexural reinforcement ratio in the calculation of the punching shear strength of the shear reinforced slab-column connection was proposed and was verified using experimental results and existing test data.
무량판 접합부의 합리적 전단보강방안 도출을 위한 비선형수치해석 연구
장재익 ( Jang Jae-ick ),강수민 ( Kang Su-min ),김진욱 ( Kim Jin-wook ) 충북대학교 건설기술연구소 2018 建設技術論文集 Vol.37 No.1
본 연구에서는 무량판 구조의 합리적인 전단보강방안 도출을 위하여 비선형수치해석을 수행하였다. 비선형수치해석 연구는 설계기준과 선행연구를 참고하여 전단보강량, 유효묻힘길이, 전단보강상세를 변수로 하였다. 본 연구에 의하면 무량판 접합부에서는 전단보강재의 양에 따라서 극한강도의 상태가 다르고 거동이 다르게 나타났다. 또한 전단보강재의 일정 유효묻힘길이 이하의 길이에서는 극심한 전단강도 하락이 일어나는 것을 파악하였으며 전단보강상세에 따라서 전단강도가 변화는 것을 확인하였다. 본 연구의 결과를 통하여 구조적으로 유리한 전단보강상세와 전단보강재에 필요한 제한사항을 파악할 수 있었다. In this study, nonlinear numerical analysis was carried out to derive a reasonable shear reinforcement method for the flat plate structure. In nonlinear numerical analysis, shear reinforcement amount, effective length, and shear reinforcement details were used as analysis parameters in reference to design codes and previous researches. According to this study, shear strengths and the ultimate behaviors of flat plate connection are different according to the amount of shear reinforcement in flat plate connections. It was also found that the shear reinforcement was ineffective on the enhancement of shear strength with the length less than certain effective lengths and shear strength varied according to the shear reinforcement details. The results of this study can be used to understand the effective details of shear reinforcement and the limitations of shear reinforcement.
Hyaluronic acid-siRNA conjugate/reducible polyethylenimine complexes for targeted siRNA delivery.
Jang, Yeon Lim,Ku, Sook Hee,Jin, So,Park, Jae Hyung,Kim, Won Jong,Kwon, Ick Chan,Kim, Sun Hwa,Jeong, Ji Hoon American Scientific Publishers 2014 Journal of Nanoscience and Nanotechnology Vol.14 No.10
<P>The clinical applications of therapeutic siRNA remain as a challenge due to the lack of efficient delivery system. In the present study, hyaluronic acid-siRNA conjugate (HA-SS-siRNA)/reducible polyethylenimine (BPEI1.2k-SS) complexes were developed to efficiently deliver the siRNA to HA receptor abundant region with the improved siRNA stability. HA and siRNA were conjugated with disulfide bonds, which are cleavable in cytoplasm. The synthesized HA-SS-siRNA was further complexed with BPEI1.2k-SS, resulting in the formation of spherical nanostructures with approximately 190 nm of size and neutral surface charge. HA-SS-siRNA/BPEI1.2k-SS complexes exhibited the improved stability against serum proteins or polyanions. These complexes were successfully translocated into intracellular region via HA receptor-mediated endocytosis, and silenced target gene expression.</P>