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염욕에 의한 강의 Boro-Aluminizing에 관하여
이용학,이민용,양훈영 연세대학교 산업기술연구소 1981 논문집 Vol.13 No.1
본 실험에서는 硼砂熔融鹽중에 Al 또는 Al-B 合金을 첨가하여 浸硼處理할 때 B과 Al의 同時浸透 與否에 대하여 定量的으로 관찰하였고 또한 B과 A1을 차례로 침투시켰을 때 顯微鏡組織, 微小硬度, 耐磨耗性 및 耐高溫酸化性에 대하여 調査하였다. 그 결과 硼砂浴에 40% Al 또는 20% A1-B合金을 첨가하면 FeB와 Fe₂B의 두 層이 生成되었고 50% Al에서 B과 Al이 동시에 침투하였으며 60% Al, 50% Al-B에서 최대의 침붕층을 얻었다. 耐磨耗性 및 耐高溫酸化性은 alumin zing 후 boronizing한 試片에서 가장 좋은 결과를 얻었다. Effects of aluminum or aluminum-boron addition into molten borax on the boro-aluminizing of steel have been studied and effects of simultaneous or successive penetration of boron and aluminum on the microstructure, microhardness, wear resistance and heat resistance have also been studied. Two layers of FeB and Fe₂B were formed at 40% Al and 20% Al-B alloy in molten borax. Boron and aluminum were penetrated simultaneously at 60% Al addition. The thickness of boride layer was maximum at 60% Al and 50% Al-B alloy additions. Wear and heat resistance of boronized specimen after aluminizing showed the best results.
남녀 유아의 체격과 체력과의 상관 : 유아스포츠단 6세를 중심으로
이정우,김영훈 한국유아체육학회 2003 한국유아체육학회지 Vol.4 No.-
본 연구는 경남 스포츠 아카테미 유아스포츠단에 입단한 6세(만 4년 4개월 ∼ 5년 : 3월 기준) 남녀를 대상으로, 체격에서 2개 항목과 체력에서 5개 종목을 측정하여 체격과 체력의 성적을 남녀별로 분석하고 상관관계를 알아 본 결과는 다음과 같다. 1. 신장과 체력과의 상관관계에서 남자는 3월에 25M 달리기(- .294)에서 약간 상관이 있었으며, 11월에 25M 달리기( .377), 윗몸 일으키기( .309)에서 약간 상관이 있었다. 여자는 3월에 25M 달리기(- .625) 한발 중심잡기(- .531), 제자리멀리뛰기( .684), V자 앉기(- .480)에서 확실한 상관이 있었으며, 11월에 25M 달리기(- .412), V앉기(- .313)에서 약간 상관이 있었다. 2. 체중과 체력과의 상관관계에서 남자는 3월에 25M 달리기(- .301), 윗몸 일으키기(. 312), V자 앉기( .331)에서 약간 상관이 있었으며, 11월에 한발 중심잡기( .306)에서 약간 상관이 있었다. 여자는 3월에 25M 달리기(- .491), 한발 중심잡기( .434), 제자리멀리뛰기( .472), V자 앉기(- .452)에서 확실한 상관이 있었으며, 11월에 한발 중심잡기(- .409), 윗몸 일으키기(- .474) V자 앉기(- .621)에서 확실한 상관이 있었다. Selecting, at my option, 44 male children and 33 female children at Kyung-nam Sports Academy kindergarten sports club in Chang-won city. I conducted a survey into correlation between 2 items of physique and 5 items of physical strength. And the results are as follow : 1. On height of physique male children' height show 3.33cm increase as average 101.70cm in March to average 111.03mn in November, whereas female children' height show 4.43cm increase as average 103.70cm in March to average 108.13cm. It means that female's growth is faster than male's one. 2. On weight of physique male children' weight show 1.73kg increase as average 18.68kg in March to average 20.41 in November. Whereas female children' weight show 1.73kg increase as average 17.91kg in March to average 19.64kg in November. 3. On physical strength, male children made an excellent 25m run, sit-ups, standing broad jump, V-form sitting, but female children made an excellent foot balance. 4. On correlation between height and physical strength for male children 25m run(.294) in March and 25m run(.377), sit-ups(.309) in November have a little correlation. For female children, in March 25m run(-.626), foot balance(-.531), standing long jump(.684), V form-sit(-.480) have a distinctive correlation whereas in November 25m run(-.412) and V form-sit (-.313) have a little correlation. 5. On correlation between weight and physical strength for male children 25m run(-.301), sit-ups(.312), V form-sit(.331) in March have a little correlation and foot balance(.306) in November have a little correlation. For female children, 25m run(-.491), foot balance(.434), standing long jump(.472), V form-sit(-.452) in March have a distinctive correlation, also foot balance(-.409), sit-ups(.47), V4 form-sit (-.621) in November have a little correlation.
LILI-128 암호의 고속화 방안 및 FPGA 구현에 관한 연구
이훈재,박영민,류명춘 경운대학교 산업기술연구소 2001 産業技術硏究論文誌 Vol.3 No.2(A)
Because LILI-128 cipher is a clock-controlled keystream generator, it makes the keystream data degrade in a speed for clock-synchronized hardware logic design: The clock-controlled LFSR_d in LILI-128 cipher requires 1∼4 times higher system clock, that is the reason why the system throughput in data rate is lower if the same clock were selected and that is the structural problem in principle. In this paper, we propose the solution to 4-bit parallel LFSR_d that each register bit has four variable data routines to feedback or shift in LFSR_d. Finally, we simulates the timing of the design on Max+plus Ⅱ of ALTERA Co., implements the logic circuit to the FPGA device (EPF10K20RC240-3), and analyses the stability on throughput to 50 Mbps rate (we choose a higher speed than T3 rate, 45 Mbps and the maximum delay routine in our design is below 20ns) under the 50㎒ system clock. For example, Lucent technologies ASIC can achieve the throughput about 500 Mbps if the maximum delay routine were 1.8㎱ at a 0.13 ㎛ semiconductor.
Fe₃O ₄-Al₂O ₃-CaO系 鑛球의 還元에 關한 硏究
양훈영,이승원,김진호,은일상 연세대학교 산업기술연구소 1975 논문집 Vol.6 No.1
Reduction of coke mixed magnetite ore pellets containing alumina and/or lime has been carried out in a fixed bed with coke powder in the temperature range of 1,100-1,250℃. Degree of metallization of the reduced pellets was obtained from the chemical analysis, and volume change of the reduced pellets was evaluated by measuring pellet diameter before and after reduction. Phase change during the reduction was also investigated by microscopic observation. The results obtained are summurized as follows. (1) As the Al₂O ₃content increases, degree of metallization of the ore pellets decreases and shrinkage of the reduced pellets also decreases. (2) Addition of 5% CaO to the 5% Al₂O ₃ pellets improves the degree of metallization and increases shrinkage of the reduced pellets, especially within the temperature range of 1,200-1,250℃. In the case of 10% CaO addition to the same pellets, however, both degree of metallization and shrinkage decrease. (3) CaO addition to the 10% Al₂O ₃ pellets showed the similar effect to that of 5% Al₂O ₃ pellets on the degree of metallization and shrinkage, showing no conspicuous effect of lime addition. (4) While Al₂O ₃ in the pellets is inhibitive to the reducibility as well as agglomeration, CaO is promotive to the above properties.
磁鐵鑛 鑛球의 還元特性에 미치는 SiO₂CaO 添加의 影響
김부천,梁勳永,이승원 연세대학교 산업기술연구소 1977 논문집 Vol.7 No.1
Direct reduction of sintered magnetite ore pellets containing 3-6% SiO₂and CaO with the basicity range of 0.5-2.4 has been made in a fixed bed with coke powder in the temperature range of 900-1200℃. Reduction degree of reduced pellets was obtained from the weight loss of the pellets after reduction. Phase change during the reduction was investigated by X-ray diffraction method and microscopic observation. Followings are the results summerized. 1) At 900℃, reduction was only reached to the wustite. Above 900℃, porous metallic iron layers began to appear and the phase of reduction proceeded topochemically towards the inside of the pellet. 2) Lime addition was more effective to the promotion of reducibility at higher temperature. 3) Reduction rate of the pellet containing 3-6% SiO₂followed well the equation, -log (1-R) = Kt, with the exception of the pellet containing higher CaO at the elevated temperature. Activation energy obtained from the above equation was the range of 21.7-25.5㎉/25.5㎉/mole. 4) Due to swelling, at 1100℃, cracking in the reduced pellet was pronounced at the basicity of 1.5, resulting uniform distribution of metallic iron. 5) In order to promote reduction degree as well as not to crack the pellet reduced, long time reduction at lower temperature followed by shorter reduction at higher temperature was recommendable.
TiO₂를 이용한 아세틸렌, 프로필렌, 프로판 가스의 광촉매 산화반응
정대일,변석인,이도훈,이용균,박유미,최순규,김동현 동아대학교 환경문제연구소 2002 硏究報告 Vol.25 No.1
Photocatalyzed degradation of acetylene, propylene, and propane gases were carried out over precoated titanium dioxide(anatase) illuminated UV light in a flow reactor. photocatalytic oxidation of acetylene, propylene, and propane gases respectively indicated high conversion rates (78.0%) to CO₂gas. And photocatalytic oxidation of three gases according to a fold, twofold, and threefold of titanium dioxide(anatase) respectively gave high conversion rate. The longer reaction time was, the higher conversion rate to CO₂gas showed.