• Korean Journal of Microbiology
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• v.43 no.3
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• pp.232-235
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• 2007

Mesophilic Crenarchaeota have been known to be predominant among ammonia-oxidizing microorganisms in terrestrial and marine environments. In this study, we determined the archaeal phylotypes carrying specific amoA by combining digital PCR and multiplex-nested PCR. Analysis of samples in which amoA and 16S rRNA gene were amplified showed that amoA gene diversity was relatively higher than that of 16S rRNA gene. Nitrifying archaeal group I.1a was dominant over I.1b group of crenarchaota and euryarchaeota. This approach could be applied for interrelating a functional gene to a specific phylotype in natural environments.

• Journal of Animal Environmental Science
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• v.21 no.3
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• pp.93-98
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• 2015

The objective of this study was to review application of next-generation sequencing (NGS) to investigate microbiome in the livestock sector. Since the 16S rRNA gene is used as a phylogenetic marker, unculturable members of microbiome in nature or managed environments have been investigated using the NGS technique based on 16S rRNA genes. However, few NGS studies have been conducted to investigate microbiome in the livestock sector. The 16S rRNA gene sequences obtained from NGS are classified to microbial taxa against the 16S rRNA gene reference database such as RDP, Greengenes and Silva databases. The sequences also are clustered into species-level OTUs at 97% sequence similarity. Microbiome similarity among treatment groups is visualized using principal coordinates analysis, while microbiome shared among treatment groups is visualized using a venn diagram. The use of the NGS technique will contribute to elucidating roles of microbiome in the livestock sector.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.35 no.2A
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• pp.134-141
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• 2010

In this paper, we propose a scheduling algorithm to improve the performance of IEEE 802.16 based wireless mesh networks using directional antenna. The performance is presented in terms of throughput of system and delay between each node by varying number of users. The result show that proposed scheduling algorithm improving the performance by reducing the delay of mesh network system. Our work may be useful as a guideline to control the fairness between SSs for multi-hop systems such as multi-hop relay and mesh networks.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.9 no.2
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• pp.226-237
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• 1998

In recent SATCOM systems, transparent transponders are widely used. The transponder is, however, the most vulnerable part in SATCOM systems against jamming interference. All signals within the transponder bandwidth are frequency-converted and retransmitted with IM(intermodulation) products. In this paper, the method is proposed that makes the SJR(Signal-to-Jammer ratio) better. The bandwidth spreading of the user signal can reduce the jammers effects. The geostationary satellite system is modeled to simulate and to certificate the capability of suppression of jammers by DSSS. If signal is partially-overlapped by jammer and PG(processing gain) is 16.9 [dB] for 2ASK jammer and about 16.8 [dB] for QPSK jammer, when BER is $10^{-3}$.

• Journal of the Korean Solar Energy Society
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• v.27 no.2
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• pp.103-109
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• 2007

This study was focused on the establishment of a fundamental DB(database) that is available in the building design process, so we performed the simulation analysis about the energy consumption on the various same volume buildings. Because energy consumption in building is affected by the exterior surface area, the ratio of long/short length in surface and the adjacent internal surface area etc.. For these purpose, we assumed the unit module and made a constructable 16 model buildings which are composed of the 16 unit modules. Then we analyzed the simulation using the TRNSYS 16 and the Seoul weather data. In results, energy consumption in building is more reduced that in case of the smaller exterior surface area, the lower stories building and the larger adjacent surface area etc.. Further study is to be required the sensitivity analysis on the various weather conditions, building shapes and window area etc..

• The monthly packaging world
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• s.215
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• pp.70-74
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• 2011

한국상품문화디자인학회는 지난 달 25일 제16회 베스트패키지디자인 수상작들을 선정, 시상식을 열었다. 학회가 주최해 온 베스트패키지디자인어워드코리아는 1995년 기업의 경쟁력을 디자인에서 찾아야 한다는 기치 아래 태동했으며, 올해 16회를 맞은 행사로, 기업과 현직 디자이너들에게 경쟁력 있는 디자인 개발의 동기를 부여함은 물론 우리 상품이 세계화로 발돋움되어 국제 경쟁력을 갖추는데 기여하고 올바른 상품 문화를 진작 시키는 데 이바지하고 있다. 패키지디자인의 지속적인 연구와 학술활동을 통해서 후학양성과 상품문화 진작을 위해 창립된 한국상품 문화디자인학회는 베스트패키지디자인어워드코리아 제정으로 사회적 책무를 더하고자 노력하고 있으며 시상부문은 대상을 비롯하여 베스트패키지상에 그래픽부문, 유통부문, 용기부문, 구조부문 등이다. 특히 이번부터 브랜드부문을 확대 신설하여 시상하고 있다. 시상 기준은 최근 2년 동안 국내 시장에서 유통되고 있는 창의력이 우수한 상품, 환경친화성 상품, 자원절약과 재활용 상품, 미풍양속을 해치지 않는 건전한 실험상품 등으로 학회원의 추천과 심의에 의해 선정된다. 학회 회원 또는 공동 주최 측으로부터의 추천된 상품을 "어워드선정위원회"가 1차 심의를 통해 심의하여 총회에 상정하고, 상정된 후보 상품을 2차에 걸친 투표로 선정하는 방법이다. 제16회 베스트패키지디자인 시상식에서는 대상에 영농조합법인 이도의 '이도발효차'가 수상했으며 유통부문 베스트패키지상으로 보해양조(주)의 '매취순10', 그래픽부문 베스트패키지상에 청정제주녹차산학연협력단의 '예스그린'이 수상의 영예를 안았다. 이 외에 구조부문 베스트패키지상 부문에 (주)지비앤소울의 '나노소울플래티늄'이, 브랜드 마케팅부문 최우수상에 (주)스코리아의 '스코리아'가 차지했으며 브랜드아이덴티티부문 최우수상은 원주시 농업기술센터 '그야말로-원주(元酒)'가 수상했다.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.49 no.7
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• pp.6-11
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• 2012

A mobile station(MS) in an 802.16e network manages its limited energy using the sleep mode operation. An MS can power down its physical operation components during the unavailability interval of the sleep mode. To reduce energy consumption by increasing the unavailability interval, this paper proposes an enhanced power saving mechanism(ePSM) when both activated Type I and Type II power saving classes(PSCs) exist in an MS. A performance evaluation confirms that ePSM results in the improved performance in terms of the unavailability interval as well as the energy consumption than conventional schemes.

• JSTS:Journal of Semiconductor Technology and Science
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• v.16 no.4
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• pp.497-505
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• 2016

The two-dimensional (2D) Discrete Cosine Transform (DCT) is used widely in image and video processing systems. The perception of human visualization permits us to design approximate rather than exact DCT. In this paper, we propose a digital implementation of 16-point approximate 2D DCT architecture based on one-dimensional (1D) DCT and Modified Gate Diffusion Input (MGDI) technique. The 8-point 1D Approximate DCT architecture requires only 12 additions for realization in digital VLSI. Additions can be performed using the proposed 8 transistor (8T) MGDI Full Adder which reduces 2 transistors than the existing 10 transistor (10T) MGDI Full Adder. The Approximate MGDI 2D DCT using 8T MGDI Full adders is simulated in Tanner SPICE for $0.18{\mu}m$ CMOS process technology at 100MHZ.The simulation result shows that 13.9% of area and 15.08 % of power is reduced in the 8-point approximate 2D DCT, 10.63 % of area and 15.48% of power is reduced in case of 16-point approximate 2D DCT using 8 Transistor MGDI Full Adder than 10 Transistor MGDI Full Adder. The proposed architecture enhances results in terms of hardware complexity, regularity and modularity with a little compromise in accuracy.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.36 no.5C
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• pp.326-335
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• 2011

In this paper, we evaluate the performance of multi-antenna techniques adopted for the IEEE 802.16m standard. Base station is equipped with 4 or 8 antennas, and each mobile station (MS) has 2, 4, 8 antennas. The number of MSs is 4, and MIMO modes 0, 1, and 4 are evaluated. For each mimo mode, various number of data streams can be implemented, and the selected number of streams in the paper corresponds to the parameters adopted for hardware implementation. The error performance of various mimo modes presented in this paper was used as reference performance to verify successful hardware implementation.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37 no.4B
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• pp.278-287
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• 2012

In this paper, we propose an allocation scheme for variable message packings to increase efficiency of military operation using Link-16 which is well-known for tactical data link by delivering imagery information rapidly. We propose a variable message packing scheme using COC waveform to support variable data rate under some coverage limitation. Variety of message packing makes Link-16 vary transmission rate appropriately for tactical environment. We also propose a allocation scheme to assign message packing to time slot properly. Finally we verify the performance and superiority of proposed ideas by simulations.