• Electronics and Telecommunications Trends
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• v.21 no.2 s.98
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• pp.192-199
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• 2006

본 고에서는 IEEE 802.16/와이브로 망에서의 IPv6 적용에 따른 시나리오 및 기존IPv6 프로토콜에 대한 네트워크 이슈들을 기술한다. 이를 위해 먼저 IEEE 802.16 망의 특성 및 IPv6 적용에 따른 문제점들을 분석하고, IPv6 적용 가능한 시나리오를 서비스 방법, 시스템 구조, CS 적용 방법, 프리픽스(prefix) 할당 방법에 따라 구분하여 제안한다. 이를 기준으로 IPv6 이웃 탐색(neighbor discovery), IPv6 패킷 전송, 이동성, 멀티캐스트, 보안 프로토콜 등이 어떠한 제한 및 수정이 요구되는지에 대해 기술한다.

• Journal of Institute of Control, Robotics and Systems
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• v.12 no.9
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• pp.912-917
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• 2006

A strain gauge weight measuring instrumentation system was designed with RF sensor network facilities. In the sensor module system data conversion and a series of signal processing were totally equipped. 16 strain gauges are incoming sensors and each output of the strain gauge was amplified and filtered for proper analog signal processing. Several measuring instrumentation OP amps and general purposed OP amps were used. 12 bits A/D converters converted analog signals to digital bits and a PIC microprocessor controlled the 16 channels of strain gauges. RF RS232 modules were used for wireless communication between the PIC microprocessor and an Ethernet host far a remote sensor monitoring system development.

• Journal of the Korean Chemical Society
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• v.32 no.4
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• pp.371-376
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• 1988

Thebaine was reacted with diisopropyl azodicarboxylate to give northebaine. Diels-Alder reaction between the compound and nitrosobenzene was attempted. The hydrogen of the adducted northebaine was substituted with chloroacetyl chloride and succinic anhydride. We have synthesized the new thebaine derivatives with phenylhydroxylamine at 14-carbon and also acetyl or succinyl at 17-nitrogen with yields of 22% and 16%.

• Journal of Ginseng Research
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• v.35 no.2
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• pp.149-154
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• 2011

In order to determine the efficacy of functional foods, objective measurement of the severity of atopic dermatitis (AD) after taking foods is important. The aim of this study was to conduct an objective evaluation of whether Korean red ginseng (KRG) might be helpful for improvement of skin condition and serum IgE in patients with AD. Thirty atopic patients (18 females and 12 males) participated in this study. Patients took KRG for 16 weeks. Bioengineering methods, including the corneometer and evaporimeter, were used at the start of the study and after 8 weeks and 16 weeks. In addition, we assessed serum IgE levels and the severity scoring of the atopic dermatitis (SCORAD) index. Transepidermal water loss and skin hydration showed significant improvement after 16 weeks. A significant decrease in the SCORAD index, as well as in serum IgE level, was observed after 16 weeks. Our results demonstrated that KRG may be helpful as a functional food for patients with AD.

• Plant Resources
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• v.8 no.1
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• pp.32-35
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• 2005

This study was conducted to investigate the influence of $K_{2}O$ fertilizer application on growth, yield and lodging resistance of rice. Culm length and panicle length were lowest at the treatment of fertilizer level, $N-P_{2}O_{5}-K_{2}O=16-8-8$ plot but number of panicle, percentage of fruitful culm, $1{\ell}$ grain weights of paddy rice and brown rice, 1,000 grains weight of brown rice, brown rice ratio, yields of paddy rice and brown rice were highest at the treatment of fertilizer level, $N-P_{2}O_{5}-K_{2}O=16-8-8$ kg/10a plot. Bending moment, breaking strength and lodging index were lowest at the treatment of fertilizer level, $N-P_{2}O_{5}-K_{2}O=16-8-8$ kg/10a plot. Judging from the results reported above, an optimum fertilizer level of rice for lodging resistance is most likely be $N-P_{2}O_{5}-K_{2}O=16-8-8$ kg/10a treatment.

• YAKHAK HOEJI
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• v.47 no.6
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• pp.398-403
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• 2003

To investigate the relationship between structure and biological activity of phenylpropanoids, we measured effects of phenylpropanoids on anti-oxidant and whitening activity, In DPPH radical scavenging activity, caffeic acid analogues showed the significant anti-oxidant activity. Although phenylpropanoids did not inhibit purified-tyrosinase activity, they significantly inhibited tyrosinase activity and melanin production in MSH-stimulated B16 melanoma cells. However, phenylpropanoids did not affect tyrosinase expression in MSH-stimulated B16 melanoma cells, which suggest that inhibition of MSH-induced melanin production was due to tyrosinase inhibition mediated via other signal pathways but not expression of tyrosinase. Phenylpropanoids also significantly inhibited both hyaluronidase and elastase activity, suggesting that phenylpropanoids may be used as whitening, hydration and anti-wrinkling agents. Hydroxyl residue of aromatic ring in phenylpropanoids plays an important role in anti-oxidant and whitening activity.

• Proceedings of the KAIS Fall Conference
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• 2001.05a
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• pp.115-118
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• 2001

최근 많은 분야에서 사용되고 있는 RF(Radio Frequency)를 이용하여 원거리에서 무선으로 소형전광판에 문자 데이터를 보낼 수 있도록 하여 손쉽게 문구를 바꿀 수 있는 광고용 전광판을 구현하였다. 구현된 전광판은 소프트웨어 부분과 하드웨어 부분으로 나누어서 살펴보면, 사용자로부터 전광판에 표시하려는 문장을 IBM PC에 입력 받아서 전광판으로 송신하도록 하는 윈도우용 프로그램과 전광판에 표시될 데이터를 무선으로 수신 받아서 전광판에 표시하도록 해주는 프로그램이 전광판에 사용되는 소프트웨어가 되겠다. IBM PC에서 전광판으로 데이터를 보내고 전광판에서 그 데이터를 받기 위해서 RF모듈을 사용하였고, 전광판에 수신된 데이터를 전광판에 표시하기 위해서 마이크로컨트롤러를 사용하였다. 구현된 전광판은 16×16크기의 도트 매트릭스를 각각 12개씩 사용하여 문자열 2줄을 표시할 수 있도록 제작하였다. 한 문자를 표현하는데 한 개의 도트매트릭스가 사용되므로 표시될 문자는 16×16도트에 맞는 문자 폰트를 가지며, 문자 폰트를 나타내는 방법은 완성형과 조합형이 있으나 프로그램을 간단히 하기 위해서 완성형을 사용하였다.

• Proceedings of the Korea Institute of Convergence Signal Processing
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• 2000.12a
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• pp.229-232
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• 2000

각종 범용 컴퓨터 및 디지탈 신호처리에서 중요한 역할을 하는 16비트 정수형, 2의 보수 형태의 곱셈연산을 수행하기 위한 고속 승산기구조를 설계하고 시뮬레이션 하였다. 부분곱을 합하는 부분은 일반적으로 전체 곱셈기 처리 지연시간의 절반정도를 차지하므로 이 부분의 설계방법이 곱셈기의 궁극적인 속도향상에 직접적인 영향을 미친다. 부분곱의 개수를 줄이기 위하여 Booth encoder를 사용하였고, partial product(부분곱)의 덧셈시간을 줄이기 위하여 4:2 CSA(can save adder)와 3:2 CSA로 CSA tree를 구성 하였으며, 최종결과는 carry look- ahead tree로 얻어진다. Hyundai CMOS 0.35$\mu\textrm{m}$ 1-poly 4-metal 공정으로 layout하여 설계하였으며, 곱셈시간은 2.7ns(tipical case)이하로 측정되었다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2006.05a
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• pp.328-331
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• 2006

In Ubiquitous age, data collection that using wireless sensor node is increasing necessity. In this paper, collect data because uses PIC16F877 and Bluetooth, and constructs database in PC. The PIC16F877 is control radio sensor node. The PC construct to propose algorithm that updates control data with table. It is changes sensing cycle time of node into intelligence style because compare collected data of DB. Result of study inexpensive , and practical, and I can apply to industry spot constructing system briefly.

• Journal of the Korea Institute of Military Science and Technology
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• v.19 no.3
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• pp.356-362
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• 2016

IEEE 802.16 standard(WiMAX) is one of 3.5G/4G wireless technologies and there are many systems based on the standard. Each frame of the systems begins with a preamble for synchronization and channel estimation, etc. IEEE 802.16 standard defines a total of 114 preamble sequences. By the way there are some systems(such as mobile multi-hop relay) that require using more than 114 preamble sequences. So we define 114 additional preamble sequences in this paper. And we evaluate PAPR and cross-correlation performance of them to decide to be usable as a preamble.