• Structural Engineering and Mechanics
• /
• v.16 no.2
• /
• pp.153-176
• /
• 2003

From the equation of motion of a "bare" non-uniform beam (without any concentrated elements), an eigenfunction in term of four unknown integration constants can be obtained. When the last eigenfunction is substituted into the three compatible equations, one force-equilibrium equation, one governing equation for each attaching point of the concentrated element, and the boundary equations for the two ends of the beam, a matrix equation of the form [B]{C} = {0} is obtained. The solution of |B| = 0 (where ${\mid}{\cdot}{\mid}$ denotes a determinant) will give the "exact" natural frequencies of the "constrained" beam (carrying any number of point masses or/and concentrated springs) and the substitution of each corresponding values of {C} into the associated eigenfunction for each attaching point will determine the corresponding mode shapes. Since the order of [B] is 4n + 4, where n is the total number of point masses and concentrated springs, the "explicit" mathematical expression for the existing approach becomes lengthily intractable if n > 2. The "numerical assembly method"(NAM) introduced in this paper aims at improving the last drawback of the existing approach. The "exact"solutions in this paper refer to the numerical results obtained from the "continuum" models for the classical analytical approaches rather than from the "discretized" ones for the conventional finite element methods.

• Journal of Microbiology and Biotechnology
• /
• v.15 no.3
• /
• pp.537-543
• /
• 2005

Subtilisin (EC 3.4.21.14) is the major extracellular alkaline serine protease of Bacillus species. Previously, we found that subtilisins did not migrate in the electrophoretic field in the Laemmili buffer system due to their high pI values (over 8.8); however, it formed a 'binding mode' at the top of the separating gel [5]. Utilizing this characteristic, four subtilisins from Bacillus sp. strains (e.g., B. subtilis 168, B. subtilis KCTC 1021, B. amyloliquefaciens KCTC 3002, and Bacillus sp. DJ-1 and DJ-4) were easily and quickly identified by an over-running electrophoretic technique with a miniscale culture supernatant (less than 20 ml) without any column chromatographic steps. Two subtilisins (DJ-l and a recombinant version) from Bacillus sp. DJ-l were characterized, and the enzymatic properties were determined by SDS-fibrin zymography and densitometric analysis. Based on this observation, the recombinant pro-subtilisin DJ-l showed the same 'binding mode,' similar to native subtilisin DJ-l. On the other hand, mature subtilisin DJ -1 without pro-peptide showed no enzymatic activity.

• Journal of the Korean Society for Nondestructive Testing
• /
• v.32 no.5
• /
• pp.573-584
• /
• 2012

Breast and prostate tumors or cancers tend to be stiffer than the surrounding normal tissue. However, the difference in echogenicity between cancerous and normal tissues is not clearly distinguishable in ultrasound B-mode imaging. Thus, imaging the stiffness contrast between the two different tissue types helps to diagnose lesions quantitatively, and such a method of imaging the elasticity of human tissue is termed ultrasound elasticity imaging. Recently, elasticity imaging has become an effective complementary diagnostic modality along with ultrasound B-mode imaging. This paper presents various elasticity imaging methods that have been reported up to now and describes their characteristics and principles of operation.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
• /
• v.35 no.2
• /
• pp.143-148
• /
• 2022

For the purpose of treating health checkups and recovery of patients in a super-aged society, hospitals use devices designed with a reduction circuit of electromagnetic waves associated with the specific absorption rate of electromagnetic waves absorbed by the human body. In this paper, we proposed a filter improvement design method capable of reducing electromagnetic waves. As a result of confirming the validity of the proposed technique through simulation and experimental results, the following result values were obtained. Applying the common-mode (CM) inductor 4 mH to a calibration circuit, noise decreased in a multiband spectrum. Using the differential mode(DM) inductor 40 µH element in the primary calibration circuit, the noise decreased by 15 dB or more in the 3 MHz band spectrum. Also, applying the Admittance Capacitance (Y-Cap) 10 nF element in the secondary calibration circuit resulted in the decrease by more than 30 dB in the band spectrum before 2 MHz. After using a common-mode inductor 4 mH element in the tertiary calibration circuit, it decreased by more than 15 dB in the band spectrum after 2 MHz.

• Journal of the Institute of Electronics Engineers of Korea TC
• /
• v.47 no.3
• /
• pp.22-30
• /
• 2010

This paper proposes a combination system of Adaptive Modulation and Coding (AMC) and Multiple Input Multiple Output (MIMO), which improves the throughput and has a better reliability. In addition, the system includes Precoding, Antenna Subset Selection and MIMO Mode Selection scheme. Finally, we make a performance analysis of the proposed system. The principal environmental parameters for the simulation experiment consist of a frequency non-selective rayleigh fading channel and a Spreading Factor (SF) of 16. Other parameters may be included in order to fulfill the requirements of the HSDP A Standard. The proposed system has a higher throughput and more reliability than the conventional system, which does not include MIMO Mode Selection scheme, Precoding or Antenna Subset Selection. According to the simulation results, the proposed system reaches the maximum throughput at 8dB, presentlng an improvement of 6dB and twice higher throughput, respect to the conventional system. Specifically, at the point of -6dB, the conventional system reaches 2.5Mbps, while the proposed system reaches 6.4Mbps at the same SNR. Also, at the point of 2dB, each system reaches 7.5Mbps (conventional system) and 15.3Mbps (proposed system), with near twice the difference. According to the results exposed above, we can conclude that the system proposed in this paper has, as the greatest contribution, the improvement of the throughput, especially, the average throughput.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.34 no.7C
• /
• pp.681-686
• /
• 2009

In H.264/Ave, an intra prediction added to the P-frame coding slightly improves both of image quality and bit rate, but greatly increases an amount of computation. In order to reduce the increase in computation, this paper proposes an image contents based intra prediction coding using characteristics that the best intra block mode depends on the image content of a macro block. The proposed algorithm estimates the image content with image complexity and the best inter block mode, and then selects or excludes a intra block mode on the basis of it. The simulation results show that the proposed algorithm reduces average O.OldB in image quality, and increases average 0.38% in the bit rate, but reduces average 37.02% in computation time compared with the conventional algorithm.

• Journal of the Korean Society of Clothing and Textiles
• /
• v.8 no.2
• /
• pp.27-40
• /
• 1984

Die Geschichte des Kostums steht in unmittelbarem odor mittelbarem Zusammenhang mit der allgemeinea historischen Entwicklung derjenigen Lander und sozialen Schichten, die das kulturclle Gesicht und damit auch die Entwicklung der Mode einer Epoche bestimmen. Im 19. Jahrhundert war das Burgertum in Europa die herrschende soziale Schicht und daher auch modisch tonangebend. Die Mode des Burgertums zeigte demokratisierende Tendon-zen: Vereinfachung der Ausstattung und der Formen, wobei sich die Proportionen der Kleidung so gut wie moglich den des Korpers anpaBten. Die Herrenmode beugte sich zunehmend den For-derungen nach ZweckmaBigkeit; dab galt zumindest fur den Tagesanzug, der immer mehr zum Arbeitsanzug wurde und sick damit der Mannerkleidung der arbeinden Schicht annahrte. Die Industrialisierung trug ebenfalls dazu bei, daB die modischen und sozialen Previlegien in der Kleidung sich verminderten : die Textil-und Konfektionsindustrie muBte sich zwangs-laufig auf die Bedurfnisse der Massen und auf deren Wunsch einstellen. In der Herrenmode setzte sich die Tendenz zu funktionaler Einfachheit und Gradlinigkeit durch, d.h. funktional uberflussige Teile wie z.B. die Vielzahl der Kragen, Knopfreihen, uberlange SchoBe verschwanden ; an die Stelle der Farbenfreude trat ein einfaches, einhei-tliches Grau, Schwarz, Blau und Braun. Diese Vereinfachung wurde zum Ausdruck der zunehmenden Demokratisierung, wurde aber zugleich auch Voraussetzung fur eine neue Differnzierung des KlassenbewuBtseins. Zum Statussymbol wurden die auffalliges Erscheinen vermeidende Eleganz und das Arrangement der einzelnen Kleidungsstucke zu einem har-monischen Ganzen; elegante Kleidung weist ihren Trager aus als Kenner des Modetrends und damit als zugehorig zum Kreis der modeavancierten Schicht. Diese Ambivalenz bestimmt auch die Mode des 20. Jahrhunderts.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.36 no.2B
• /
• pp.111-119
• /
• 2011

As Green-IT has attracted a lot of attention in recent years, many researches have been interested in reducing the energy consumption of network equipments. In this paper, we analyze the energy saving ratio and delay performance according to various traffic patterns and burst assemble algorithms in OBS network with sleeping mode. To do this, we design the traffic generators, which are based on exponential distribution and Pareto distribution, and the router model, which has the time based and length based burst assemble algorithms by using OPNET modeler. Through OPNET simulator, we evaluate the energy saving performance in terms of the sleeping time, the number of transitions and packet delay.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.17 no.9
• /
• pp.2174-2182
• /
• 2013

This paper analyzed the PHY technology of IEEE 802.15.7 which is a technology trend and international standard of the LED-based VLC communication system. Also, the study analyzed the complexity of the system as well as the reception performance in a visible light wireless channel environment by analyzing detailed technology of PHY I mode and designing the RS code and block interleaver. According to the result, concerning PHY I which is operated in a single mode, it was confirmed that the complexity in designing the system was higher compared with an environment of the transmission of a short massage. Also it was confirmed that in a multi-path visible light channel environment, the reception SNR=1.5dB was required additionally.

• Proceedings of the KIEE Conference
• /
• 2009.07a
• /
• pp.1507_1508
• /
• 2009

This study proposes a composite right/left-handed transmission line (CRLH-TL) that permits switching between the right-handed (RH) and left-handed (LH) modes using single crystalline silicon (SCS) RF MEMS switches. It is possible to change modes from the RH to LH mode, or vice versa, by controlling the admittance of capacitors and the impedance of inductors using switch operations. The proposed switchable CRLH-TL consists of SCS RF MEMS switches, metal-insulator-metal (MIM) capacitors and shunt inductors. At 8 GHz, the fabricated device shows a phase response of $87^{\circ}$ with an insertion loss of 2.7 dB in the LH mode, and a phase response of $-77^{\circ}$ with an insertion loss of 0.56 dB in the RH mode.