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송현교,김연구,이택희,강민구 호남대학교 정보통신연구소 1995 정보통신연구 Vol.4 No.-
본 논문에서는 실제 통신망에서 발생할 수 있는 데이타 전송과정을 컴퓨터상에 시뮬레이션하는 프로그램으로서, PC의 WINSOW 환경하에서 Visual-Basic을 활용하여 통신신호의 흐름과정을 하나의 화면에서 구현하도록 부호화와 변조파형을 표현하고 이 신호의 복조와 복호과정을 시뮬에이션한다. 아울러 통신채널에서 발생하는 랜덤오류를 제어하는 오류정정을 포함함으로서 통신이론을 이해하고 학습하는데 많은 도움이 될 수 있도록 통신신호에 대한 그래픽 처리에 목적을 둔다. In this thesis, the graphic signal for communication is presented in the WINDOW using `Visual-Basic'. All signals of PCM encoding/decoding and modulation/demodulation are processed in the same picture. Especially, error control schemes which are parity check, longiudinal redundancy check, cyclic redundancy check, are described for more reliable communication.
송택렬 漢陽大學校 工學技術硏究所 1997 工學技術論文集 Vol.6 No.1
Lateral steering dynamics are analyzed for a rolling airframe missile with asymmetric control configuration. In particular, pich and yaw coupling is clarified in the presence of phase lags induced by an actuator and a rate gyro. Base on the analysis, a gain scheduling method is proposed for guidance and control. The approach taken in this paper is different from previous work and practical in the respect that it utilizes a body axis coordinate system on which actual aerodynamic forces and moments generated from control fans and guidance commands from an on board seeker are based.
폐타이어 담체를 이용한 유동상 생물막공정의 고도처리 효율에 관한 연구
송창열,이택순,서규태,문병현 7개 국립대학교 환경연구논문집 공동발행 위원회 2005 공업기술연구 Vol.5 No.-
Organic and nutrient removal was investigated in a full scale fluidized phase biofilm process of 800m-(3)/day using waste tire media for domestic wastewater treatment. Various internal reciculation ratio was set as an operation condition to enhance nitrogen removal efficiency. The process operation results are as follows. Significantly high removal efficiency above 94% could be obtained by the biofilm process in terms of organics(BOD&COD_(Mn)) and suspended solid(SS). Relatively low nitrogen removal of 53% was observed at the internal recycling 100% of influent flow rate. However the removal efficiency could be increased to 70% at 200% internal recycling. The process showed also considerably high T-P removal efficiency of 80% producing effluent concentration of 0.68mg/L for 3.38mg/L influent.
PVC 및 Olefin계 Copolymer의 열안정성에 관한 연구(II) : 열안정 영향 인자 Thermal Stability Factor
송해영,황택성,맹기석,박인환 忠南大學校 産業技術硏究所 1986 산업기술연구논문집 Vol.1 No.2
Several structural factors which governs the thermal stability of poly(vinyl chloride) were investigated by IR and H¹-NMR spectroscopy. PVC-Olefin copolymers having diverse structure were prepared by same reaction conditions such as reaction temperature and comonomer composition. It was found that keto allyl groups in the polymer backbone which were formed through a side reaction show the most pronauncing effect. The content of keto allyl group appeared to increase with the relative amount of olefin comonomers. On the other hand, neither chain branching nor tecticity influenced the thermal stability of copolymer. Also, the content of double bond fromed at chain ends was unrelated to the thermal stability.
보이드 생성기구에 의한 복합조직강의 연성 파괴거동에 관한 연구
吳澤烈,崔明振,楡龍錫,金松正 慶熙大學校 材料科學技術硏究所 1993 材料科學技術硏究論集 Vol.6 No.-
Ductile Fracture of Dual Pase Steel begins with void nucleation, at Martensite-Ferrite interface or deformed Martensite particle. In this study void nucleation, void growth, void volume fraction and void coalescence at given strain were studied in dual phase steel. Therefore, by means of the heat treatment of low corbon steel the study deal with void nucleation and void growth for ferrite grain sizeof dual phase steel. Void nucleaton and void growth with increasing strain are shown depend upon the ferrit grain size. The number of voids and volume fraction of voids generary increase as ferrite grain size decrease. At the close to fracture the void coalescence in the direction of the applied tensile stress, but near the fracture surface they linked in direction transverse to the tensile axis.
에스테르화 반응을 이용하여 중간크기기공의 TiO₂ 제조 시용액의 조성이 물리적 성질과 광촉매 활성에 미치는 영향
오송택,이호인 한국공업화학회 2004 응용화학 Vol.8 No.1
Mesoporous TiO₂ was prepared using esterification between triblock copolymer (Pluronic P123) and acetic acid, and was applied to the photocatalytic decompositions of 2-isopropy1-6-methyl-4-pyrimidinol (IMP) and cyanide (CN). To increase inorganic-organic interaction which is necessary in synthesis mesoporous material, P123 and TTIP were mixed in several different solvents such as ethanol, acetone, and hexane. When ethanol was used, a very sharp PSD appeared, but the activity was very low because of its small surface area and pore size which are critical properties in the photocatalytic decompositions of cyanide and IMP, respectively. TiO₂ prepared using acetone gave the very high activity in the cyanide decomposition due to the large surface area. Unlikely, hydrophobic hexane caused large pore size resulting in the increase of the activity of IMP decomposition.
광촉매 산화반응에서 촉매의 비표면적과 기공 크기가 활성에 미치는 영향
오송택,최재석,이한수,이호인 한국공업화학회 2003 응용화학 Vol.7 No.2
Mesoporous TiO₂was prepared using esterification between poly ethylene glycol(PEG) and acetic acid, and was applied to the photocatalystic decomposition of 2-isopropyl-6-methyl-4-pyrimidinol (IMP), cyanide ion, and rhodamine B (RB) in order to study the effect of surface area and pore size on the activity. When catalysts had similar specific surface areas, the activity of photocatalytic decomposition of IMP was proportional to the pore size due to more facile diffusion into the pore. However, in case of cyanide which size is much smaller than the pore size of TiO₂the activity was proportional to the specific surface area, while a very large size molecule of RB caused low activity due to difficulty in diffusion into the pore.
세포질내 정자주입법(ICSI)에 있어서 정자흡입 및 난자내 주입방법에 관한 연구
이택후,김항진,송건호,김대근,전상식,박윤규,서태광,전병균,류은경,이은숙,문진수,김광철 경북대학교 의학연구소 2000 경북대학교병원의학연구소논문집 Vol.4 No.1
Study on Method of Sperm Aspiration and Injection into an Oocyte in Intracytoplasmic Sperm Injection(ICSI) Immobilization of spermatozoa prior to intracytoplasmic sperm iniection(ICSI) sometimes results in crooked tail and this makes it difficult to aspirate sperm into an injection pipette tail first. Head-first sperm aspiration into an injection pipette avoid this problem due to the bigger size of the sperm head. The effect of head or tail-first sperm injection into an oocyte on fertilization cleavage, percentage of grade I embryos and development to blastocyst stage in ICSI program has been studied. A single living immobilized spermatozoa from oligoasthenozoospermic patient was injected into an oocyte head-first or tail-first according to the treatment. Eighteen hours after microinjection, oocytes ware inspected for survival and fertilization Fertilized oocytes with two pronuclei were cultured in 30μl drop of mHTF supplemented with 10% heat-inactivated follicular fluid(FF) at 37℃. On day 2. embryo transfer was performed with cleaved embryos. The remaining 2-8 cell stage embryos were co-cultured with BRL cells in mHTF + 10% FF for 72 hours and the developmental stage was observed. The data were analyzed by Analysis of Variance. A total of 164 oocytes from 36 cycles were assigned to earth treatment and ICSI was performed(88 head-first, tail-first). The rates of normal fertilization were 81.8% and 76.3% for head-first and tail-first, respectively. Of the fertilized oocytes, the percentage of cleaved embryos and the percentage of grade 1 embryo among cleaved embryos were 88.9% and 68.8%, 93.1% and 74.1% for head-first and tail-first, respectively. Of the 2-8 cell embryos cultured, 44.4%(16/36) and 50.0%(10/20) for head first and tail first, respectively developed to blastocyst stage. There were no differences in fertilization, cleavage, rates of grade 1 embryos, and development to blastocyst stage. In conclusion, head-first or tail-first sperm injection into an oocyte in ICSI program does not affect fertilization and subsequent embryo development to blastocyst stage in vitro.
폴리에틸렌 글리콜과 아세트산의 에스테르화 반응을 통한 메조포러스 TiO_2의 제조 및 광촉매 산화반응에의 적용
오송택,최재석,이한수,이호인 한국공업화학회 2003 응용화학 Vol.7 No.1
TiO_2 was prepared through esterification between polyethlene glycol(PEG)and actic acid, and was applied to the photocatalytic decomposition of 2-isopropy1-6-nrthy1-4-pyrimidinol. Photocatalytic activity was increased with the increase of pore size which was produced by prmoving PEG diring calcination When excess amout of H_2O was added the catalytic removing PEG during calcination When excess amout of H_2O was added, the catalytic activtiy and pore size dercased as a result of direct hydrolsis vetween titanium precursor and water added. When the amount of PEG increased, esterification occurred more but the activity and the surface area of TiO_2 were derased, esterification because of agglomeration among PEG molecules.