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Nucleation of CVD Diamond on Various Substrate Materials
Fukunaga, O.,Qiao, Xin,Ma, Yuefei,Shinoda, N.,Yui, K.,Hirai, H.,Tsurumi, T.,Ohashi, N. The Korean Ceramic Society 1996 The Korean journal of ceramics Vol.2 No.4
Diamod nucleation by mw assisted CVD was examined various conditions namely, (1) diamond nucleation on variour substrate materials, such as Si, cubic BN, pyrolytic BN and AIN, (2) AST(Activated species transport) method which promote nucleation of diamond on single crystal and polycrystalline alumina substrate was developed. (3) Effect of bias enhancement of nucleation on single crystalline Si was examined, and finally (4) DST (Double step treatment) method was developed to enhance diamond nucleation on Ni. In this method, we separated carbon diffusing process into Ni, carbon precipitating process from the inside of Ni and diamond precipitation process.
Pressure and Temperature Control and HPHT Diamond Synthesis Using FB25 Type Belt Apparatus
Fukunaga, O.,Ko, Y.S.,Ohashi, N. The Korean Ceramic Society 1998 The Korean journal of ceramics Vol.4 No.1
Flat belt(FB) type high pressure apparatus has been succesfully utilized in various high pressure experimental stations in Korea and Japan to conduct HPHT (high pressure and high temperature) diamond synthesis. Present paper discusses pressure calibration of FB apparatus at high temperature to establish P-T condition of diamond synthesis. We also present some examples of controling P-T condition through careful experimental set-up of the high pressure sample cells. Finally we discuss reproducibility of pressure and temperature condition of the HPHT diamond synthesis.
Temperature Dependences of Electric Polarization and Magnetic Ordering of TmMn2O5
Mamoru Fukunaga,H Kimura,K Kohn,Y Noda 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.2I
In order to reveal the relationship between the appearance of ferroelectricity of RMn2O5 and magnetic ordering, we have measured the ferroelectric P-E hysteresis loops and investigated the temperature dependence of the electric polarization of TmMn2O5. Strange P-E loops were ob- served, and a pyroelectric response was observed even on zero .eld cooling. The causes of both strange phenomena are unknown, but the temperature-dependent tendencies of the polarization and of the coercive .eld corresponding to the magnetic phase diagram were observed.
( Ken Fukunaga ),( Yoko Yokoyama ),( Koji Kamokozuru ),( Kazuko Nagase ),( Shiro Nakamura ),( Hiroto Miwa ),( Takayuki Matsumoto ) The Editorial Office of Gut and Liver 2012 Gut and Liver Vol.6 No.4
Background/Aims: Weekly granulocyte/monocyte adsorption (GMA) to deplete elevated and activated leucocytes should serve as a non-pharmacological intervention to induce remission in patients with ulcerative colitis (UC). This trial assessed the efficacy of monthly GMA as a maintenance therapy to suppress UC relapse. Methods: Thirty-three corticosteroid refractory patients with active UC received 10 weekly GMA sessions as a remission induction therapy. They were then randomized to receive one GMA session every 4 weeks (True, n=11), extracorporeal circulation without the GMA column every 4 weeks (Sham, n=11), or no additional intervention (Control, n=11). The primary endpoint was the rate of avoiding relapse (AR) over 48 weeks. Results: At week 48, the AR rates in the True, Sham, and Control groups were 40.0%, 9.1%, and 18.2%, respectively. All patients were steroid- free, but no statistically significant difference was seen among the three arms. However, in patients who could taper their prednisolone dose to <20 mg/day during the remission induction therapy, the AR in the True group was better than in the Sham (p<0.03) or Control (p<0.05) groups. Conclusions: Monthly GMA may potentially prevent UC relapse in patients who have achieved remission through weekly GMA, especially in patients on <20 mg/day PSL at the start of the maintenance therapy. (Gut Liver 2012;6:427-433)
( Ken Fukunaga ),( Kazuko Nagase ),( Takeshi Kusaka ),( Nobuyuki Hida ),( Yoshio Ohda ),( Koji Yoshida ),( Katsuyuki Tozawa ),( Koji Kamikozuru ),( M Iimuro ),( Shiro Nakamura ),( Hiroto Miwa ),( Taka 대한소화기기능성질환·운동학회 2009 Gut and Liver Vol.3 No.1
Background/Aims: Cytapheresis (CAP) is a novel strategy for ulcerative colitis (UC). However, there is insufficient data on the long-term outcome of UC patients who achieve remission by CAP. This study involved patients with severe UC who refracted to intravenous (iv) corticosteroid. Methods: Forty-seven UC patients who had received CAP therapy for the first time within 1 year after UC diagnosis were followed for 36 months. One of the inclusion criteria was a clinical activity index (CAI) of ≥7 points at the end of a 2-week iv course of corticosteroid therapy. CAP therapy consisted of ten sessions over 10 weeks. Results: CAP induced clinical remission (CAI≤4) in 70.2% patients (33/47). The number of submissions for colectomy was higher for severe UC at entry (CAI≥12, n=25) than for moderately severe UC at entry (7≤CAI<12, p=15; p<0.02). The cumulative rates of avoiding surgery and relapse were 54.5% and 24.2%, respectively, at 36 months in patients who responded to CAP therapy. This was similar to that of iv cyclosporine reported recently. Conclusions: This study suggest that CAP is an effective therapy in patients who are refractory to conventional medications including iv corticosteroid. Increased remission rates should be expected in refractory patients with moderately severe UC. (Gut and Liver 2009;3:41-47)
Improvement of Bonding Driver and Application to Parallel Processing on Commodity PC Cluster
Takafumi Fukunaga 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
We have studied various methods for improving the performance of PC clusters. Most of them have used special hardware, non standard protocols, so that need special added library and complex programming, tending to raise their cost and to spoil their flexibility. To solve their problems we propose improving of Bonding driver. This improvement have a good influence on some kinds of parallel applications on commodity PC clusters without costing a great deal, using comparatively simple method where distribute sending frames to multiple Network Interface Cards (hereafter NICs) on a round-robin basis. This means divide communication loads equally between multiple NICs attached to each PC. We measured the maximum bandwidth and parallel performance for the PC cluster with Gigabit Ethernet. A result shows our proposal method improves the bandwidth and the performance of several parallel benchmarks in comparison with the system using single NIC (hereafter 1NIC) and existing Bonding driver (hereafter Bond). The bandwidth comes up to 1,249Mbps which is 1.33 times and 1.47 times faster than those of 1NICand Bond. The bandwidth of Bond cannot even reach that of 1NIC. The results of SP and BT in NAS Parallel Benchmarks (NPB) come up to 1,715 Mop/s and 5,264Mop/s which are 1.81 and 1.63 times faster than 1NIC, 1.17 and 1.15 times faster than Bond respectively.
MAGNETIC PROPERTIES OF FERRITE CORES UNDER DC - BIASED FIELD
H. Fukunaga,S. Masumoto,Y. Ohta,H. Kakehashi,H. Ogasawara 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.5
Ferrite cores are often magnetized under DC-biased field because they have been intensively used in electronic circuits such as an inverter circuit and a switching regulator circuit. Thus we investigated the effects of DC-biased field on magnetic properties in the frequency range of DC-100㎑ for two kinds of ferrite cores, TDK PC38 and TDK H₃S, which have different shapes of B-H loop from each other. The magnetic loss per cycle, W/f, in the H₃S core decreased with increasing the strength of DC-biased field, although W/f in the PC38 core increased monotonically with DC-biased field. The observed decreasing tendency differs from the previous result for Si-Fe and ferrite cores, and can be attributed to decrease in eddy current loss as well as that in hysteresis loss.
M. Fukunaga,Y. Noda 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.2
We measured the ferroelectric D-E hysteresis loops of multiferroic EuMn2O5 by using the double- wave method (DWM), which was recently developed. The DWM can extract the hysteresis loops with respect to the bias electric field, for example, ferroelectric loops and antiferroelectric loops. Improvements and supplementary explanations for the DWM are given in this paper. Ferrielectric hysteresis loops were obtained as combinations of three loops by using the non-biased and biased DWM. The temperature dependences of the ferroelectric and the antiferroelectric parts of the polarization of EuMn2O5 was measured by using the DWM. The former decreases and the latter increases between about 14-21 K. We measured the ferroelectric D-E hysteresis loops of multiferroic EuMn2O5 by using the double- wave method (DWM), which was recently developed. The DWM can extract the hysteresis loops with respect to the bias electric field, for example, ferroelectric loops and antiferroelectric loops. Improvements and supplementary explanations for the DWM are given in this paper. Ferrielectric hysteresis loops were obtained as combinations of three loops by using the non-biased and biased DWM. The temperature dependences of the ferroelectric and the antiferroelectric parts of the polarization of EuMn2O5 was measured by using the DWM. The former decreases and the latter increases between about 14-21 K.