• Food Science and Preservation
• /
• v.17 no.1
• /
• pp.131-138
• /
• 2010

To obtain basic data on the use of lotus as a raw material in functional food, antioxidant and anticancer activities of the leaf and root were investigated. Total flavonoid and total phenolic contents, at 12.84 mg/g and 24.33 mg/g respectively, were higher in white lotus leaf (WLL) than in any other part of the plant. The radical-scavenging activity of different tissues of lotus, measured in the DPPH radical-scavenging assay, increased with higher concentrations of solvent fractions. The butanol fraction of white lotus leaf showed the highest DPPH radical-scavenging activity. The reducing power of fractions increased in a dose-dependent manner. The butanol fraction of WLL had the greatest reducing power, and showed strong antioxidant activity in the linoleic acid system, and high-level inhibition of tyrosinase. Fractions from lotus were also capable of scavenging nitrite, depending on the concentration of the fractions. Butanol fractions of the leaf of white and red lotus scavenged 95.61% and 92.15% of available nitrite, respectively, when used at 1 mg/mL concentrations. Butanol fractions from leaf of white and red lotus exhibited the strongest inhibitory effects on human lung and colon cancer cells.

• The Korean Journal of Applied Statistics
• /
• v.9 no.2
• /
• pp.55-72
• /
• 1996

It is essential in modern industry that quality and procuctivity are improved continuously. To accomplish this purpose, quality control must be maintained in all parts of a company. Recently, some tire manufacture companies are beginning to show interest in quality control. They have tried to achive some results through the statistical analysis for the experimental data which has accumulated up to now and then they strive to determine the structural relationship between the design factors in tire construction and tire performance characteristics. The measurement data obtained from the construction engineering is given in multivariate form owing to the various properties found in tire design components as wll as in performance. Also it may be existed the relationship among the multimple response variables. Thus we proposes the use of the biplot graphical display as an analytic tool of data matrices with complex respects. The proposed biplots are also availalbe to understand both the underlying structure of the data and the roles played by the different components. In particular, we consider the matter of how best to use the biplots in the maltivariate analysis of variance and multiple response data. Finally we apply this method to analyze the actual data.

• Archives of design research
• /
• v.13
• /
• pp.15-24
• /
• 1996

No mater how brilliant brain a man has, as time goes by, it is certain to fall into a lapse of memory phenomenon in according to cease to exist as a matter of course. But as previously stated, there is no room for douby, if we make advertising information for being changed into a sign which is to be treated easily and simplified, we can easily memory and withdraw it. In other words, the information is to be coded simpler, the memory and recollection of it is to be easier as wll as we can raise the precision rate. Good many advertising today, it appears, try to raise the acknowlegement rate with shock of good-sized and exposure frequency. In this advertising form, we can aspire to the intention of advertiser to try to get lapse of the message of advertising. Of course, even if it cannot be an index of every advertising information called simplified memory and recollection rate, it should be emphasized that it cannot but have something to do with the consumer's memory. Which to be obtained by invested advertisement. As for it, there are so many things to be taken charge of a lots of content by graphic designer: to be obtained mental distribution of resources inconnected with a desire of consumer, to be converted memory information into being less than that and treated easier, and to be correlated the memory information with the previously known things.

• Journal of the Korean Institute of Telematics and Electronics D
• /
• v.36D no.5
• /
• pp.1-10
• /
• 1999

A low power concumption 2.4 GHz one-chip transceiver MMIC was designed and fabricated using $1.0\mu\textrm{m}$ ion-implantation MESFET process and packaged on a 24 lead SSOP. In the transmitter mode, it revealed conversion gain of 7.5 dB, output IP3 of -3.5 dBm, and noise figure of 3.9 dB at 2.44 GHz with 3.9 mA current consumption. In the receiver mode, it revealed voltage sensitivity of 6.5 mV/$\mu\$W with 2 .0 mA current consumption. Comparing the fabricated MMIC with the results of MMICs reported elsewhere, it was shown that the fabricated MMIC had good performance. The low power consumption 2.4 GHz transceiver MMIC is expected to be used for various applications such as wireless local area networks, wireless local loops and RFID tags in ISM-band.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.11 no.12
• /
• pp.2205-2209
• /
• 2007

In this paper, a voltage controlled oscillator(VCO) of core components for wireless subscriber network is designed. The type of oscillator is colpits method and the oscillator device uses a LC resonator. The product is made on FR-4 substrate with dielectric constant of 4.6. The designed VCO is operated at 3.2V, 10mA and has output value of 0.67dB. The VCO's phase noise property is -102DBc/Hz at offset frequence of 100kHz. The fabricated VCO is the same as target value and can be used for wireless subscriber network.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2008.04a
• /
• pp.42-42
• /
• 2008

Considerable attention has been focused on the applications of flexible liquid crystal (LC)-based displays because of their many potential advantages, such as portability, durability, light weight, thin packaging, flexibility, and low power consumption. To develop flexible LCDs that are capable of delivering high-quality moving images, like conventional glass-substrate LCDs, the LC device structure must have a stable alignment layer of LC molecules, concurrently support uniform cell gaps, and tightly bind two flexible substrates under external tension. However, stable LC molecular alignment has not been achieved because of the layerless LC alignment, and consequently high-quality images cannot be guaranteed. To solve these critical problems, we have proposed a PDMS pixel-wall based bonding method via the IB irradiation was developed for fasten the two substrates together strongly and maintain uniform cell gaps. The effect of the IB irradiation on PDMS with PI surface was also evaluated by side structure configuration and a result of x-ray photoelectron spectroscopic analysis of PDMS interlayer as a function of binder with substrates. large number of PDMS pixel-walls are tightly fastened to the surface of each flexible substrate and could maintain a constant cell gap between the LC molecules without using any other epoxy or polymer. To enhance the electro-optical performance of the LC device, we applied an alignment method that creates pretilt angle on the PI surface via ion beam irradiation. Using this approach, our flexible LCDs have a contrast ratio of 132:1 and a response time of about 15 ms, resulting in highly reliable electro-optical performance in the bent state, comparable to that of glass-substrate LCDs.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.29 no.3B
• /
• pp.314-324
• /
• 2004

Recently, high-speed internet subscribers have grown continuously, and reached up to 10 millions. But existing network management that is responsible only for user access is confronted with many difficulties, since user access network(xDSL, Cable, B-WILL, and so on) has diversified and value added wired/wireless contents service has developed. In this paper propose the Agent based Inter Networking platform as object-oriented hierarchical system that can provide various service such as access QoS(Quality of Service), customized application service and security service according to user on demand. This system has divided into two parts(user agent and agent management system ＆ local and central management systems). Management system periodically receive status information such as bandwidth, download speed, delay, current service, and so on, and process them, then build a policy based on processed information. According to personal user profile that is generated by this policy, the customized service can be provided for users. And This system adopt the object-oriented modeling in case that system migration and integration, and implement a system that is robust and stable for security through hierarchical server system.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.24 no.6A
• /
• pp.871-880
• /
• 1999

In this paper, a pseudo-noise(PN) tracking and demodulation circuits are analyzed and designed for a direct-sequence/spread-spectrum multiple access system under a mobile fading channel. We consider noncoherent delay locked loop(DLL) as a PN code tracking loop which has 1/8 PN chip resolution. The tracking performance of DLL is evaluated in terms of locking time from a loose state and tracking jitter. The received signal is demodulated to original data by despreading with PN code locked by DLL. Also the designed circuit supports sound service of 32Kbps and in-band signal with 4.096MHz chip clock. The circuits are implemented and verified with FPGA, which is shown completely data recovery under AWGN 7dB and will be available for IMT-2000.

• Asian Pacific Journal of Cancer Prevention
• /
• v.14 no.10
• /
• pp.6147-6150
• /
• 2013

Background: Breast feeding is considered to be mutually beneficial for both mothers and infants, though the effect of lactation problems on development of breast lesions (whether benign or malignant) is not clear. Objectives: This study was conducted to identify possible relations between lactation problems and benign and malignant breast disease. Materials and Methods: 308 patients referred to two referral breast clinics in Tehran, the capital city of IR Iran, between January 2008 and January 2011, were recruited. They were interviewed by a standard questionnaire regarding breast feeding problems. The study population was classified in 3 major groups; breast feeding without any problem, unwillingness to breast feed according to whether mothers' preference not to feed or some breast problems like mastitis, and finally insufficient milk that caused the mothers to feed their babies with formula. Results: Recruiting binary logistic regression method, mother's unwillingness to feed her child by breast milk, and also breast problems such as mastitis and abscess during lactation period showed significant relation with both benign and malignant breast diseases (p value<0.01). Surprisingly, inadequate milk was not associated with any of these conditions. Conclusions: We concluded that lactation problems which involve normal milk drainage from the breast may play an important role in whether the mother wll subsequently develope both benign and malignant pathologies. In contrast in the situation that the production of the milk is not sufficient and there are no intentional or unintentional problems in drainage of the produced milk, future problems would not be more common.

• Journal of Navigation and Port Research
• /
• v.38 no.6
• /
• pp.615-621
• /
• 2014

VTS operators may suffer from acute, chronic, or traumatic stress caused by their workload and working environments associated with task or combination of task. This study intended to measure the level of VTS operator' stress and find out factors influencing it by understanding their characteristics during carrying out their task. For this purpose, analyzed the data collected through conducting survey on VTS operators as the Korea Occupational Stress(KOSS) and Psychological Well-being Index(PWI). As a result, VTS operators are experiencing higher level of psychological stress than the national average. And the factors to cause VTS operators' occupational stress can be summarized as follows; working environment factors, shift work especially night duty, workload, etc. This study provides the fundamental information for understanding human factors of VTS operator' occupational stress.