• Korean Aquaculture
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• v.14 no.1
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• pp.63-66
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• 2002

담수산 rotifer, Brachionus calyciflorus는 담수어류의 종묘생산시 초기 자어의 먹이생물로 많이 이용되고 있다. 특히, 이 종의 암컷은 수컷에 관계없이 암컷이 난을 생산하는 처녀생식과 수컷과의 교미에 의해 암컷이 수정란(내구란)을 형성하는 유성생식으로 나뉘어진다. 한편, 유성생식에 의해 형성된 내구란은 두터운 2차 난막으로 싸여져 있어 외부환경이 부화에 적합하지 않으면 강한 내구성을 지니고 있어 휴면 상태를 계속 유지한다. 이러한 내구란은 종의 유전적 형질을 효율적으로 보관할 수 있을 뿐만 아니라 대량배양하기 위한 종자 및 수산 생태 독성학의 실험재료로 이용할 수 있다. 또한 내구란은 Artemia cyst처럼 쉽게 부화시켜 자어에 직접 먹이로 공급할 수 있는 장점으로 인해 rotifer 대량배양에서 오는 유해 세균과 원생동물에 의한 자치어의 2차 감염을 방지 할 수 있다. 이처럼 rotifer, B. calyciflorus 내구란은 여러 가지 용도로 이용 가능하기 때문에 내구란을 대량생산할 수 있는 조건을 규명하는 것도 중요하다. 그리고 생산된 내구란을 사용 목적에 따라서 간편하게 이용하기 위해서는 내구란을 제품으로 만드는 것도 매우 중요하다. 따라서 본 내용은 담수산 rotifer 내구란을 상품화하기 위한 방법으로 내구란의 대량생산과 보존방법에 대해서 설명하고자 한다.

• Weed & Turfgrass Science
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• v.7 no.2
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• pp.111-119
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• 2018

This study was carried out to investigate the differences in germination and growth of Quamoclit coccinea Moench under various temperatures, seeding depths, and levels of shading and soil moisture for effective weed management. Seed dormancy of Q. coccinea Moench was over 1 year; best results were obtained when seeds were soaked in sulfuric acid for 15 minutes in order to break the dormancy. Germination rates of Q. coccinea Moench ranged from 69 to 73% at $25-35^{\circ}C$ and 26% at $15^{\circ}C$. The germination rates ranged from 70-84% at 2, 3, 5, 7, and 8 cm of seeding depths. In addition, the germination rates were 7% and 13% at 12 cm and 15 cm of seeding depths, respectively, and showed normal growth at the both seeding depths. Q. coccinea Moench showed a high germination rate regardless of shading levels, but shoot fresh weight varied depending on the level of shading as follows: 20%>no shading=shading 35%>shading 50%>shading 75%=shading 90%. Q. coccinea Moench did not germinate when soil had a saturation rate of either 30% or 100%. However, 60-83% of seeds germinated with optimal growth when soil had saturation rates of 60% and 80%.

• Journal of Practical Agriculture & Fisheries Research
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• v.26 no.1
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• pp.16-21
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• 2024

Green manure crops have a variety of benefits, including improving soil fertility, removing soil salinity, enhancing soil aeration and moisture regulation, reducing the use of chemical fertilizers, reducing nitrous oxide emissions, reducing herbicide use through weed-suppressive effects, promoting agricultural ecosystem protection and carbon dioxide absorption capacity. To find ways to increase the germination rate of legumes and green manure crop seeds, which are imported in large quantities every year. It was carried out that two seed priming methods, osmotic priming and heat treatment, and compared their effects. Heat treatment was treated for 10 minutes at 40℃ or 60℃, followed by rinsing with water. Osmotic priming was applied for 30 seconds in a saline solution with a specific gravity of 1.13. Overall, there was no significant difference in the final germination rate, but it was found that osmotic priming and heat treatment affected the germination speed. However, applying heat treatment and osmotic priming simultaneously did not affect the germination characteristics. Therefore, it is suggested that heat treatment and osmotic priming can increase the germination speed of soybean and green manure crops.

• Journal of Ginseng Research
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• v.25 no.4
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• pp.167-170
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• 2001

Experiments were conducted to study the optimum chilling period for breaking physiological dormancy of dehisced ginseng(Panax ginseng C. A. Meyer) seed. Embryo of ginseng seed is too small to be noticed with naked eyed on harvesting time. Embryo grew to half size of endosperm after seeds were stratified for 3 months. It takes 6 months for this embryo to reach the size enough for germination. And it grew faster indoors than outdoors. Dehisced ginseng seed with full-size embryo did not germinate at room temperature and required chilling treatment for 75days in outdoors and 90 days in cold chamber. While seed receiving sufficient chilling treatment were left to be in room temperature, the chilling effect decreased remarkably.

• The Journal of the Korea institute of electronic communication sciences
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• v.11 no.9
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• pp.861-868
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• 2016

Dummy messages are usually generated for faking in preserving the location privacy of a sink or source against the global eavesdropping in wireless networks. In this paper, we propose a new method in which a certain number of nodes determined by considering the required privacy level are made to transit to the dormant state doing nothing so that the total number of dummy messages is reduced, while the paths from the sink to the sources are ensured. Through simulation we verify the success ratio of path establishments between the sink and a set of sources and the location privacy level of them.

• Journal of Internet Computing and Services
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• v.10 no.4
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• pp.151-160
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• 2009

Wireless network solution is used in many area because of free mobility and easy of establishment. Sensors that compose wireless network need protocol that support wireless communication to share information each other. As representative protocol, we currently witnessed IPv6 protocol. However, due to the limitation of sensors's electric power and computing ability, it is inefficient that each sensors use this protocol. In this paper, we designed improved sensor circuit that can heighten energy efficiency in sensor network to solve these problem and composed algorithm that can pare down energy consumption using method to make unnecessary sensor in sleep-mode.

• Proceedings of the Korea Technology Innovation Society Conference
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• 2017.11a
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• pp.3-48
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• 2017

우리나라 연구개발(R&D) 투자는 2014년 기준 세계 6위, GDP 대비 총 연구개발비 비중은 4.29%로 세계 최고 수준으로 조사되었다. 또한 정부 R&D 예산은 지속적으로 증가하는 추세를 유지하고 있으며, 연구개발비 투자 규모 증대에 따라 국가과학기술역량의 양적 증대뿐만 아니라 질적 수준 또한 향상되고 있는 것으로 평가되고 있다. 뿐만 아니라 연구성과의 활용 측면에서 기술사업화로 연계가 큰 폭으로 증가한 것으로 조사되었다. 반면 R&D 예산 및 성과 활용의 양적 질적 증대가 이루어졌음에도 불구하고 다수의 연구성과가 사업화로 연계되지 못하고 휴면 상태로 있다는 조사결과도 있다. 이에 본 연구는 막대한 예산, 특히 정부 R&D 예산 투입에 의하여 창출되는 연구성과가 기술이전뿐만 아니라 사업화까지로 연계될 수 있도록 영향을 미치는 요인을 선행연구 분석을 통해 도출하고, 각 요인 간 영향 및 기술사업화에 영향을 미치는 핵심요인에 대해 정량적 데이터 분석을 수행할 것이다. 본 연구는 기술의 이전 및 사업화에 관한 연구를수행함에 있어 결정주체, 정책/제도 등의 관점에서 분석한 정태적 접근과, 사업화 전체 프로세스의 관점에서 분석한 동태적 접근을 포괄하는 통합적인 연구라는 점에서 의의가 있으며, 본 연구결과는 산 학 연 및 정부의 기술이전 사업화 관련자들이 보다 종합적인 관점에서 효과적인 사업화 전략 수립을 통해 성과 확산에 기여하는데 정책 자료로 활용될 수 있을 것으로 기대된다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.13 no.5
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• pp.9-15
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• 2013

In this paper, automatic recognition of an accident and whether service delivery and risk driving through the giving of the driver to correct driving habits before and after the accident to reproduce highly scalable video Smart Mobile Blackbox DVR (SMBD, Smart Mobile Blackbox DVR) Computer of the model was designed. SMBD on embedded systems equipped with wireless capabilities to sleep in the car accident point and the image information by wireless communications, by notification in the control center, 24-hour emergency rescue service and traffic information can be provided. The vehicle ECU (Electronic Control Unit) of the vehicle information and sensor data in conjunction with wireless eCall (Emergency Call) services can be realized.

• Journal of the Korea Computer Industry Society
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• v.6 no.3
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• pp.465-476
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• 2005

The wireless sensor network consists of a number of sensor nodes which have physical constraints. Each sensor node senses surrounding environments and sends the sensed information to Sink. In order to alleviate the inherent vulnerability in security of the wireless sensor nodes with the hardware constraints, the lightweight security protocol is needed and a variety of research is ongoing. In this paper, we propose a non-hierarchical sensor network and a security protocol that is suitable for monitoring man-made objects such as bridges. This paper, furthermore, explores a two-layer authentication, key distribution scheme which distributes the key and location of a sensor node in advance, and an effective security routing protocol which can take advantage of the Sleep and Awake state. This also results in the increased data transfer rate by increasing the number of alternative routing paths and the reduced energy consumption rate.

• Journal of Korean Society of Forest Science
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• v.83 no.4
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• pp.531-539
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• 1994

We examined the in vitro rooting and survival of tissue cultured plantlets of Quercus acutissima Carr. and Pinus densiflora Sieb. et Zucc. after addition of Pisolithus tinctorius(Pt) ectomycorrhizal fungus inoculum to the medium and effects of three levels of sucrose and phosphorus in culture media. Shoots of Quercus acutissima were obtained from winter buds of a 30-year old tree and cuttings of Pinus densiflora from germinated seed, and they were inoculated with Pt in vitro. In both species, Pt enhanced shoot length, survival, number of adventitious roots, root length, and rooting percentage. Survival in Quercus acutissima was increased from 75% in control to 100% in Pt inoculation. Pt inoculation increased the percentage of rooting from 20% to 70% in Quercus acutissima cuttings and from 63% to 100% in Pinus densiflora cuttings. It is concluded that mycorrhizal inoculation to tissue cultured Quercus acutissima Carr. and to in vitro cutting of Pinus densiflora Sieb. et Zucc. has practical application to improvement of poor root development and initial period of reduced shoot growth in vitro.