• Journal of information and communication convergence engineering
• /
• v.2 no.2
• /
• pp.110-115
• /
• 2004

The prosthesis of current commercialized apparatus has considerable problems, requiring improvement. Especially, LLP(Lower Limb Prosthesis)-related problems have improved, but it cannot provide normal walking because, mainly, the gait control of the LLP does not fit with patient's gait manner. To solve this problem, HCI((Human Computer Interaction) that adapts and controls LLP postures according to patient's gait manner more effectively is studied in this research. The proposed control technique has 2 steps： 1) the multilayer neural network forecasts angles of gait of LLP by using the angle of normal side of lower limbs； and 2) the adaptive neural controller manages the postures of the LLP based on the predicted joint angles. According to the experiment data, the prediction error of hip angles was 0.32［deg.］, and the predicted error of knee angles was 0.12［deg.] for the estimated posture angles for the LLP. The performance data was obtained by applying the reference inputs of the LLP controller while walking. Accordingly, the control performance of the hip prosthesis improved by 80% due to the control postures of the LLP using the reference input when comparing with LQR controller.

• YAKHAK HOEJI
• /
• v.5 no.1
• /
• pp.51-55
• /
• 1960

Some enzymatic properties of Cynthia roretzi V. Drasche (Korean:U-Rung-Shei) was studied by author and obtained the following results; 1. The optimum pH of the digestive gland proteinase ws 7.4-7.6 2. Activity of metallic ion on the Proteinase showed following order; 10$^{-3}$ M. M $n^{++}$>1-$^{-3}$ M. $Co^{++}$>10$^{-4}$ M. $Mg^{++}$\ulcorner10$^{-2}$ M.S $r^{++}$. Inhibition of metallic ion on the Proteinase showed following order: 10$^{-3}$ M. A $g^{+}$>10$^{-3}$ M. c $d^{++}$>10$^{-3}$ M. P $b^{++}$>10$^{-3}$ M. Z $n^{++}$ 3. The digestive gland enzyme inactivated at 70.deg. C, but no influence at 50.deg. C. 4. When the enzyme concentration increase 2 times, and 3 times, the enzymatic activity also increase, but not proportionally 5. The digestive gland Proteinase showed remarkably higher enzymatic activity than the intestinal Proteinase. 6. The digestive gland amylase brom the ascidion showed remarkably higher enzymatic activity than the heptaponcreatic amylase from shell fish (Turbo (Batillus) Cornutus Solander).).er).).).er).).

• The KSFM Journal of Fluid Machinery
• /
• v.2 no.2 s.3
• /
• pp.64-73
• /
• 1999

The three-dimensional numerical study of a water jet pump was carried out to investigate the relationship between performance and the geometric variables of nozzle space, area ratio, and throat length. Because of the complex geometry, the multiblock technique was adopted for numerical analysis and a special treatment for transferring data from each of the block interfaces was implemented in order to maintain the conserved properties. To validate the present code, flow passing through a square duct with a 90-deg bend was computed, our results show good accordance with other experimental and computational results. The numerical simulation was done with the flow of the water jet pump having a 180-deg bend in order to calculate the performance at different operating conditions. The performance of the water jet pump can be improved by study of parameters which clarify the relations between the geometric variables and the flow characteristics of vortex strength and location.

• Electrical & Electronic Materials
• /
• v.8 no.4
• /
• pp.426-433
• /
• 1995

Effect of boron in GaAs have been investigated by photo induced current transient spectroscopy(PICTS). The starting material was undoped liquid encapsulated Czochralski(LEC) semi insulating GaAs and boron ion implantation at 150keV energy was conducted with dose of 10$\^$12/ and 10$\^$13/ions/cm$\^$2/. In ion implanted samples, the peaks related arsenic vacancy(V$\_$As/) were decreased but complex lattice defect was increased with annealing temperature. U band was observed at ion implanted(10$\^$13/ ions/cm$\^$2/) and thermally treated(550.deg. C) sample. More negative peak was detected after annealing at temperature between 600 and 700.deg. C. The measurement of dark current showed that the formation of B$\_$GA/-V$\_$As/, complex defect and complex lattice defect by ion implantation were a reasonable explanation for the decrease in dark current.

• Electrical & Electronic Materials
• /
• v.8 no.3
• /
• pp.261-266
• /
• 1995

In this study, PZT solutions added impurities of Yttrium acetate were prepared by sol-gel processing and were deposited on Pt/ $SiO_{2}$/Si substrates at 5000 rpm for 20 sec. using spin-coating method. Coated films were annealed at 700-750.deg. C for 30 min. using conventional furnace method. Variations of the crystallographic structure and microstructure of PZT thin films with adding impurities were observed using XRD and SEM, and the electrical properties, such as relative permittivity, tan .delta., hysteresis curves and leakage currents, were measured. As the yttrium contents were increased, the remanent polarization and coercive field were decreased. Variations of remanent polarizations and coercive fields of pure and yttrium doped specimens according to polarization reversal cycles were observed using hysteresis measurement. PZT thin films added $Y^{3+}$ ions were completely crystallized at 750.deg. C. $Y^{3+}$ ions, as donor impurity, substituted Pb.sup 2+/ ions located at A-site of perovskite structure. By substitution of $Y^{3+}$ ions, leakage currents became less by decreasing the space charges. Degradation of remanent polarizations of Yttrium added specimens after fatigue was not observed and coercive fields increased more than those of pure PZT thin films.

• Journal of the Korean Institute of Telematics and Electronics B
• /
• v.33B no.12
• /
• pp.24-30
• /
• 1996

In this paper, we designed a new type of high frequency on-chip voltage controlled oscillator (VCO) using GaAs MESFET, and their performances were comapred with those of the conventional VCO. Each VCO was designed with three-to-five ring oscillator and inverter, buffer and NOR gate were implemented by GaAs source coupled FET logic, which has better speed and noise performance compared to other GaAs MESFET logic. SPICE simulation showed that the gain of conventional and our new VCO was 1.24[GHz/V], 0.54[GHz/V], respectively. The frquency tuning range were 2.31 to 3.55 [GHz] for conventional VCO and 2.47 to 3.01[GHz] for our new design. This shows that the factor of two gain reductin was achieved without too much sacrifice in the oscillation frequency. For our new VCO, the average temperature index was -2[MHz/.deg. C] in the range of -20~85[.deg. C] the power supply noise index was 5[MHz/%] for 5.3[V].+-.10[%] and total power consumption was 60.58[mW].

• Korean Journal of Optics and Photonics
• /
• v.8 no.5
• /
• pp.426-430
• /
• 1997

A signal processor is implemented to verify the possibility of a closed-loop signal processing for the open-loop fiber-optic gyroscope (FOG). As an all-digital implementation of phase tracking scheme, it does analog-to digital conversion of the detector output and signal processing all-digitally thereafter for a noise-immune FOG signal processor. It has a potential of 36-bits resolution in the $2\pi$ range which is best in the number and sets no limit in the magnitude of the phase shift. The new signal processor was tested on an all-fiber gyroscope and turned out to have a resolution of $3\mu$rad(corresponds to 0.74 deg/hr), which is good enough to measure the Earth's rotation rate.

• Korean Journal of Microbiology
• /
• v.16 no.2
• /
• pp.79-89
• /
• 1978

The RK-temperate phage which infected with Bacillus cereus was isolated and the characters were investigated. The induction of RK-temperate phage from host bacterium attained by ultraviolet light irradiation (15W, 30cm, 30-120sec) and mitomycin C treatment (0.2-2 ug/ml). The host range of RK-temperate phage was not revealed with lysogenic and related strains of B. cereus. But B. cereus(PS) 352 which obtained by N-nitrosoguanidine treatment(1,000.$\mu$g/ml) to phage infected with host bacteria was sensitive bacteria of RK-temperate phage. RK-temperate phage was stabilized at the condition of nutrient broth (pH 7-8), Tris-buffer (pH 7-8) and ammonium buffer (pH 8-9) and Sorensen's phosphate buffer (pH 6-7), but unstabilized at other salt solutions and pH range. Also, thermostability was to 45.deg.C but unstabilized at above 50.deg.C. At RK-temperate phage, the measurment values of head, neck, mid tail and end tail were 59nm, 9*16nm, 10*189nm, and 10*14nm respectively. The morphology of head was regular polyhedron, and the end tail was coneate form. On the one hand, the number of capsid protein layer of tail were consist of 4, 35, and 1 at neck, mid tail, and end tail, respectively. RK-temperate phage was identified with DNA phage and G+C contents were 38.63. The latent time of RK-temperate phage was 30 minutes and the burst size was 70-80. And the host bacteria was lysed in case of multi-infection, above moi 1.

• Journal of Physiology & Pathology in Korean Medicine
• /
• v.19 no.6
• /
• pp.1534-1540
• /
• 2005

In order to testify the urate lowering effects of Daihwangmudan-tang(DMT), ICR mice were injected monosodium urate into the abdominal cavity and then DMT was administered on 2 and 4 days after Injection. Uric acid and triglyceride were measured as hematological indices of gout, and some genes related with this change were identified by ACP based GeneFishing PCR method and direct sequencing. From this experiment, DMT highly decreased the blood levels of uric acid and significantly suppressed and lowered the acute increment of triglyceride level. There were 11 differentially expressed genes(DEG) having relations with positive actions of DMT, and 4 major genes in the middle of DEGs were sequenced; Mfap 2, jagged 2, Hsd17b7, DkkI-1, These genes were supposed that several mechanisms through interleukin 1 and T-cell anergy, LDL cholesterol metabolism, wnt pathway would be related with the anti-inflammation effect against gout.

• Proceedings of the Korean Society for Food Science of Animal Resources Conference
• /
• 2005.10a
• /
• pp.119-122
• /
• 2005

본 연구는 한우 근내 지방 축적 기작을 구명하고 고급육과 저급육에서 차등 발현되는 유전자를 발굴 동정하여 한우 육질 진단을 위한 분자 표지 마커로 활용하기 위해 GeneFishing PCR 기법을 이용하여 한우 육질등급에 따른 등심조직에서 차등적으로 발현되는 유전자를 분석하였다. 한우 육질 등급($1^+$ 등급 vs 3 등급)간에 총 10개의 차등 발현 유전자가 확인되었고 이 가운데 고급육 한우 등심에서 발현량이 높은 유전자가 4개 그리고 저급육 등심에서 발현량이 높은 유전자 6개가 각각 검출되었다. 발현량 차이 유전자를 cloning하여 염기서열을 분석하고 상동성 검색을 실시한 결과 고급육에서 발현량이 높은 DEG는 주로 EST(expressed sequence tag) 유전자들로 밝혀졌고 저급육에서 발현량이 높은 DEG는 malate dehydrogenase 2(MDH2), myosin heavy chain 2a, triosephosphate isomerase 1(TPI 1), actin, alpha 1, skeletal muscle(ACTA1 ) 유전자들로 동정 되었다. 본 연구를 통해 한우 육질간 차등 발현되는 유전자들은 한우 육질 및 등급판정을 위한 표지인자(marker)로 활용할 수 있어 유전자 마커를 이용한 고급육 생산 한우의 육질 조기진단이 가능할 것이다.