• 한국임상수의학회:학술대회논문집
• /
• 한국임상수의학회 2006년도 추계학술대회 및 정기총회
• /
• pp.128-128
• /
• 2006

• 한국정보디스플레이학회:학술대회논문집
• /
• 한국정보디스플레이학회 2003년도 International Meeting on Information Display
• /
• pp.535-538
• /
• 2003

Liquid crystal molecules with a new fluoro-isothiocyanate moiety were synthesized. They showed remarkably high $T_{NI}$ (>190 $^{\circ}C$), wide mesophase range of 170 $^{\circ}C$, high dielectric anisotropy (>14) and high optical anisotropy (>0.28). New LC Mixtures of the high $T_{NI}$ (>$85^{\circ}C$) was blended with the novel fluoro-isothiocyanate containing LC molecules, phenylcyclohexanes, bicyclohexanes and ester compounds. The LC mixtures show a fast speed (<10ms) of the below one frame rate in 17" WXGA panel.

• Journal of Microbiology and Biotechnology
• /
• 제4권2호
• /
• pp.95-101
• /
• 1994

The effects of glycine on cell growth and L-omithine production were investigated in shake-flask and jar fermentor cultures of a citrulline auxotrophic mutant, Brevibacterium ketoglutamicum BK 1046. In the shake-flask culture, the optimal concentration of glycine for L-ornithine production was found to be 20 g/l. In the jar fermentor culture with the glycine at an initial concentration of 20 g/l, L-ornithine production increased by 28%, compared to that of the culture with no glycine added. 37 g/l of L-ornithine was produced when additional feeding of glycine (5 g/l) was made. This was a significant improvement in L-ornithine production compared to that (ca. 24 g/l) of the corresponding batch culture conducted without glycine. According to the stoichiometric analysis with the batch fermentation results, the experimental and theoretical L-ornithine yields based on the glucose consumption were 0.24 and 0.59, respectively. This indicates that the performance of L-ornithine fermentation can further be improved by the supplementation of glycine and the development of a mutant strain possessing a higher growth yield.

• 전기학회논문지P
• /
• 제54권3호
• /
• pp.111-118
• /
• 2005

Since the residential load is an AC load and the output of solar cell is DC power, the photovoltaic system needs the DC/AC converter to utilize solar cell. In case of driving to interact with utility line, in order to operate at unity power factor, converter must provide the sinusoidal wave current and voltage with same phase of utility line. Since output of solar cell is greatly fluctuated by insolation, it is necessary that the operation of solar cell output in the range of the vicinity of maximum power point. In this paper, DC/AC converter is three phase PWM converter with smoothing reactor. And then, feed-forward control used to obtain a superior characteristic for current control and digital PLL circuit used to detect the phase of utility line.

• 한국통신학회논문지
• /
• 제31권9C호
• /
• pp.889-896
• /
• 2006

본 논문은 직교 주파수 분할 다중 반송파 (OFDM) 시스템에서 입력 심볼 시퀀스의 주기와 연관하여 crest 값의 확률 분포를 유도하였고, 이로부터 입력 심볼 시퀀스의 주기가 짧을수록 OFDM 신호가 확률적으로 큰 crest 값을 갖는다는 것을 보인다. 다음으로 해밍 거리가 D인 두 입력 심볼 시퀀스의 crest 값 관계를 유도 한다. 이 두 결과를 이용하여 OFDM 시스템의 crest 값을 감소하기 위한 선택 사상 기법(SLM)에서 사용되는 위상 시퀀스 집합의 두 가지 조건을 제시한다. 마지막으로 m-시퀀스를 순환 이동하여 생성한 순환 하다마드 (cyclic Hadamard) 행렬의 행들로 구성한 집합을 최적에 근사한 위상 시퀀스 집합으로 제안한다.

• Fisheries and Aquatic Sciences
• /
• 제15권2호
• /
• pp.91-97
• /
• 2012

To isolate a nonylphenol (NP)-degrading bacterium, we isolated a single colony from the NP-degrading microbial consortium SW-3, which was previously isolated from an aqueous environment. Ten colonies that exhibited different cell morphologies were isolated and the strains were named SW-3-A, -B, -C, -D, -E, -F1, -F2, -G, -H, and -I. The ability of isolates to degrade NP was evaluated by kinetic analysis by the constant of NP degradation rate ($k_1$) and the half-life time of NP degradation ($t_{1/2}$). SW-3-F1, -F2, -G, and -I strains were superior at degrading NP. The $k_1$ and $t_{1/2}$ values of the four strains were sixfold higher and one-sixth lower, respectively, than those of the consortium strain. Additionally, SW-3-F1, -G, and -I strains were tested for their ability to degrade NP during coculture. NP degradation by coculture with a combination of all three strains was inferior to that of culture conducted with single isolates, suggesting that the three strains are antagonistic toward each other during NP degradation.

• 한국임상수의학회:학술대회논문집
• /
• 한국임상수의학회 2007년도 춘계학술대회
• /
• pp.151-151
• /
• 2007

• 제어로봇시스템학회논문지
• /
• 제15권8호
• /
• pp.867-875
• /
• 2009

A wireless sensor network inherently comprises a plurality of sensor nodes widely deployed for sensing environmental information. To add new functions or to correct some faulty functions of an existing wireless sensor network, the firmware for each sensor node needs to be updated. Firmware update would be quite troublesome if it requires the gathering, reprogramming, and redeploy of all of already deployed sensor nodes. Over-the-air programming (OTA) facilitates the firmware update process, thereby allowing convenient maintenance of an already-deployed sensor network. This paper proposes and implements a remote firmware update mechanism for a TDMA-based wireless sensor network, in which the firmware for sensor nodes constituting the TDMA-based sensor network can be easily updated and the update process can be conveniently monitored from a remote site. We verify the validity of the proposed firmware update method via experiments and introduce three wireless sensor networks installed in outdoor sites in which the proposed firmware update mechanism has been exploited.

• 한국전기전자재료학회논문지
• /
• 제20권5호
• /
• pp.421-424
• /
• 2007

Thermal behavior of $Li_{1-x}CoO_2$ has been investigated employing DSC (Differential Scanning calorimetry) and TGA (Thermogravimetry Analyzer), and the crystal parameters were calculated from XRD (X-ray diffraction).for the commercial rectangular pouch cell(1000 mAh).The cathode materials coated over aluminium foil current collector is made up of a blend consisting of active material $LiCoO_2$(size $20\;{\mu}m$, 94 wt%), conducting material super p black (SPB, 3 wt%) and binder polyvinylidene fluoride (PVDF, 3 wt%). The anode is a mix consisting of carbon (92 wt%) and PVDF(8 wt%) coated over copper foil. The cells for the experiments were first preconditioned by cycling three times and stabilized at OCV=3.0, 3.5, 4.2, 4.35 and 4.5 V. The stabilized cathode material was used for thermal and crystal parameter investigations.

• 한국통신학회논문지
• /
• 제32권10C호
• /
• pp.935-941
• /
• 2007

본 논문에서는 유한 길이 LDPC 부호의 높은 신호대 잡음비(SNR)에서 성능 향상을 위한 방법으로 비균등 전력할당 방법을 제안한다. 밀도진화(density evolution)를 통해서 얻어진 Tanner 그래프의 변수 노드와 체크 노드간의 연결 분포(degree distribution)와 실제 사용되는 부호의 연결 분포 간의 차이를 변수 노드의 차수에 따라 해당 비트에 전력을 비균등하게 할당하는 방법을 이용한다. 본 논문에서는 IEEE 802.16e 표준에 제시되어 있는 부호를 이용하여 모의실험을 수행하였고, 비교적 높은 SNR에서 성능이 향상됨을 볼 수 있었다.