• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• v.49 no.6
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• pp.332-338
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• 2023

Objectives: This study aimed to compare the effectiveness of a hybrid arch bar (hAB) with the conventional Erich arch bar (EAB) for the management of jaw fractures, focusing on their use for temporary fixation in patients undergoing open reduction and internal fixation (ORIF). Materials and Methods: Patients presenting with maxillary and mandibular fractures at our institution were included in this prospective, comparative study. Placement time and ease of occlusal reproducibility were recorded intraoperatively for Group A (hAB patients) and Group B (EAB patients). The primary outcome was comparison of the postoperative stability of the two arch bars. Postoperative measurements also included mucosal overgrowth, screw loosening or wire retightening, and replacement rates. The data were tabulated and computed with a P<0.05 considered statistically significant. Results: The study included 41 patients. A statistically significant difference was observed in postoperative stability scores (3) between Group A and Group B (85.0% vs 9.5%, P=0.001). The mean placement time in Group A (23.3 minutes) significantly differed from that in Group B (86.4 minutes) (P<0.001). The ease of intraoperative occlusion was not different between the two groups (P=0.413). Mucosal overgrowth was observed in 75.0% of patients (15 of 20) in Group A. Conclusion: The hAB was superior to EAB in clinical efficiency, maxillomandibular fixation time reduction, stability, versatility, and safety. Despite temporary mucosal overgrowth, the benefits of hAB outweigh the disadvantages. The choice between hAB and EAB should be based on specific clinical requirements.

• Biomolecules & Therapeutics
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• v.8 no.4
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• pp.332-337
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• 2000

Physicochemical properties of aspalatone (acetylsalicylic acid maltol ester, AM), which has been recently found to have an antithrombotic effect, were studied in terms of solubility, dissolution, partition coefficient (Pc) and stability. The solubility of AM at 37$^{\circ}C$ was about 1.2 mg/ml and the P$_{c}$ value for n-octanol/water and chloroform/water was 11.4 and 382.6, respectively. Dissolution rates of AM at pH 1.2 and 6.8 were more than 80% within 30 min. The degradation of AM followed apparent first-order kinetics, and was dependent on temperature, pH and ionic strength. From the pH-rate profile, the optimal pH was found to be at around 4.0. Half-lives at pH 1.2 and 6.8 were 33.5 and 44.4 hr, respectively. The degradation rate of AM at pH 1.2 was somewhat faster than that of aspirin, but at pH 7.0, the degradation rate of AM was slower than that of aspirin.n.

• Microbiology and Biotechnology Letters
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• v.7 no.2
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• pp.71-74
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• 1979

The growth characteristics of Methylomonas methanolica YUFE 101, isolated from sewage samples, have been studied. conclusions of the study were; (1) Optimum cultivation pH and temperature are 6.3 and 32.5$^{\circ}C$ respectively (2) The specific oxygen uptake rate was 332 $\mu$ι/mg-dry weight/hr. (3) The maximum specific growth rate was 0.19 h $r^{-1}$ and celluar yield was 0.43 g-dry cell/g-methanol in batch culture, (4) The maximum biomass productivity achieved was 0.21 g-dry cel1/ι/hr at a dillution rate of 0.1 h $r^{-1}$ during continuous cultivation. (5) The contents of crude protein and total nucleic acid in the dry cell were 73 ％ and 12 ％ respectively.

• Polymer(Korea)
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• v.37 no.3
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• pp.332-341
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• 2013

H-shaped amphiphilic pentablock copolymers $(PSt)_2-b-PCL-b-PEO-b-PCL-b-(PSt)_2$ was synthesized via chemoenzymatic method by combining enzyme-catalyzed ring-opening polymerization (eROP) of ${\varepsilon}$-caprolactone (${\varepsilon}$-CL) and atom transfer radical polymerization (ATRP) of styrene. By this process, we obtained copolymers with controlled molecular weight and low polydispersity. The structure and composition of the obtained copolymers were characterized by nuclear magnetic resonance (NMR), gel permeation chromatography (GPC) and infrared spectroscopy analysis (IR). The crystallization behavior of the copolymers was analyzed by differential scanning calorimetry (DSC) and X-ray diffraction (XRD). The crystallization behavior of the H-shaped block copolymers demonstrated a PCL dominate crystallization. The self-assembly behavior of the copolymers was investigated in aqueous media. The hydrodynamic diameters of the copolymer micelles in aqueous solution were measured by dynamic light scattering (DLS). The morphology of the copolymer micelles was observed by atomic force microscopy (AFM) and transmission electron microscopy (TEM). The hydrodynamic diameters of spherical micelles declined gradually with the increase of the hydrophobic chain lengths of the copolymers. The critical micelle concentration (CMC) values were determined from fluorescence emission, and it was found that the CMCs decreased with an increase of PSt hydrophobic block lengths.

• Tribology and Lubricants
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• v.36 no.6
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• pp.332-341
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• 2020

High-speed turbomachinery implements gas foil bearings (GFBs) due to their distinctive advantages, such as high efficiency, lesser part count, and lower weight. This paper provides the test results of the static structural stiffnesses and loss factors of bump-type foil thrust bearings with increasing preload and bearing deflection. The focus of the current work is to experimentally quantify variability in structural stiffnesses and loss factors among the four test thrust bearings with identical design values and material of the bump and top foil geometries using the same (open-source) fabrication method. A simple test setup, using a rigidly mounted non-rotating shaft and thrust disk, measures the bearing bump deflections with increasing static loads on the test bearing. The inner and outer diameters of the test bearings are 41 mm and 81 mm, respectively. The loss factor, best-representing energy dissipation in the test bearings, is estimated from the area inside the local hysteresis loop of the load versus the bearing deflection curve. The measurements show that structural stiffnesses and loss factors of the test bearings significantly rely on applied preloads and bearing deflections. Local structural stiffnesses of the test bearings increase with applied preloads but decrease with bearing deflections. Changes of loss factors are less sensitive to applied preloads and bearing deflections compared to those of structural stiffnesses. Up to 35% variability in static load structural stiffnesses is found between bearings, while up to 30% variability in loss factors is found between bearings.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2002.07a
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• pp.327-332
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• 2002

식물조직배양용 바이오리액터내 배양액의 pH, DO 농도를 on-line으로 계측하고 제어하기 위한 시스템을 개발하여 시스템의 성능시험과 경시간격별 배양액의 농도변화를 계측하였으며, 주요 연구결과는 다음과 같다. 가. 복수의 바이오리액터내 배양액의 pH, DO 농도를 전극을 이용하여 on-line으로 계측하며, 농도의 계측값과 목표값을 비교하여 피드백으로 제어할 수 있는 시스템을 개발하였다. 나. 배양액의 농도변화를 계측한 결과 pH는 배양초기 5.0에서 배양이 경과됨에 따라 서서히 떨어져 2개월 후에는 3.8까지 떨어지는 것으로 나타났다. 다. 배양액의 성분중 배양초기에는 암모니아태 질소의 흡수가 질산태 질소보다 많이 이루어져 구근으로부터 H+이온을 유출시킴으로 pH의 값이 떨어지는 것으로 나타났다. 라 오염이 발생한 리액터내의 배양액 성분은 pH의 값이 3이하로 떨어졌으며, 이로부터 배양액의 오염경보를 할 수 있는 것으로 나타났다.

• Journal of IKEEE
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• v.20 no.3
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• pp.330-332
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• 2016

In this study, we investigate the influence of channel length of bendable a-Si:H thin film transistors (TFTs) on their electrical characteristics as a function of bending strain. Under a tensile strain of 1.69%, $8{\mu}m$-channel-length TFT has the threshold voltage shift up to 5.25 V, while $100{\mu}m$-channel-length TFT operates stably.

• Journal of Biosystems Engineering
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• v.30 no.6 s.113
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• pp.327-332
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• 2005

In this study, the electronic power steering control system was developed and it was carried out to investigate experimentally the effect of the steering force for the on-road and off-road. The electronic power steering control system was engineered new trend system of power steering control system for tractor. It was composed of the electronic controller, detector, motor and mechanism mounted on tractor chassis. It was tested at the field in condition of tractor traveling speed 0 km/h, 3 km/h, 8 km/h, 11 km/h, 15 km/h, 18 km/h, 22 km/h, 25 km/h for measuring a maximum steering force. As a speed of tractor increased, a steering force decreased regardless of on-road or off-road. In addition, it is sufficiently a possibility of application of the steering system of tractor.

• Honam Mathematical Journal
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• v.27 no.2
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• pp.317-332
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• 2005

In this paper we consider the hp-version to solve non-constant coefficients elliptic equations on a bounded, convex polygonal domain ${\Omega}$ in $R^2$. A family $G_p=\{I_m\}$ of numerical quadrature rules satisfying certain properties can be used for calculating the integrals. When the numerical quadrature rules $I_m{\in}G_p$ are used for computing the integrals in the stiffness matrix of the variational form we will give its variational form and derive an error estimate of ${\parallel}u-{\widetilde{u}}^h_p{\parallel}_{1,{\Omega}$.

• 대한예방의학회:학술대회논문집
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• 2002.10a
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• pp.332-333
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• 2002