• Journal of IKEEE
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• v.24 no.1
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• pp.72-80
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• 2020

This paper describes the design and fabrication of a BUC(Block Up-converter) which is a component of a FST (Flyaway Satellite Terminal), one of the ET(Earth Terminal) of the military satellite. BUC is physically composed of an up-converter module, a high power amplifier module, a receive band suppression filter, a housing, and a cable assembly. It was designed using simulator AWR to satisfy the electrical characteristics of BUC's such as maximum output power, gain, unwanted signal, and intermodulation. The maximum output power and gain characteristics were measured at 43.4dBm and 51.8dB, respectively. The unwanted wave and intermodulation characteristics were -73.5dBc and -31.9dBc, respectively. Of the electrical requirements of Table 1, not only the above four but also all of the items were confirmed to be satisfied.

• Journal of IKEEE
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• v.24 no.1
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• pp.81-89
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• 2020

This paper describes the design and fabrication of a LNB(Low Noise Block downd-converter) which is a component of a FST(Flyaway Satellite Terminal), one of the ET(Earth Terminal) of the military satellite. LNB is physically composed of an down-converter module, a low noise amplifier module, a transmit band suppression filter, a isolator, a housing, and a cable assembly. It was designed using simulator (AWR) to satisfy the electrical characteristics of LNB's such as gain, noise figure and unwanted signal. The gain and noise figure characteristics were measured at 61.4dBm and 1.37dB, respectively. The unwanted wave was measured at -66.79dBc. Of the electrical requirements of Table 1, not only the above three but also all other items were confirmed to be satisfied.

• Korean Journal of Agricultural Science
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• v.10 no.1
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• pp.90-96
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• 1983

The short period fermentation of the mushroom compost was studied as a method for the labor saving and mechanization of composting. Rice straw was crushed, watered and supplemented with organic nutrient sources. The straw-nutrient mixtures prepared were stacked and turned for short periods at the phase I and the phase II was carried out for 8 days. The total nitrogen of the short compost was lower than that of the conventional straw compost and it caused the yield decrease. The productivity of the short compost could be improved by the supplement of nurient sources. The effective nutrients were perilla meal and rice bran. Higher microflora of the rice straw-nutrient mixture during fermentation could shorten the composting period. For the short compost method the proper period of the phase I was 5 days.

• Korean Journal of Agricultural Science
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• v.19 no.1
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• pp.33-39
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• 1992

Effects of buprofezin, a chitin synthesis inhibitor of insects, on mycelial growth, protoplast formation and reversion of Coriolus versicolor, Ganoderma applanatum and G. lucidum were investigated. The mycelial growth of C. versicolor, G, applanatum and G, lucidum was severely inhibited by buprofezin treatment, and the inhibition rate severely as the concentration of the buprofezin increased. Aerial mycelia and oidia formation of the mushrooms were increased by buprofezin treatment, but mycelial morphology was not changed. The rate of protoplast formation and reversion of G, applanatum was greatly increased by the treatment of the buprofezin, while that of G. lucidium was decreased. The rate of protoplast formation of C. versicolor was also increased when buprofezin was added to the medium, but the rate of protoplast reversion was not affected by the treatment, From the results obtained in this experiment, we found that the rate of protoplast. formation and reversion was increased by the treatment of the buprofezin in the mushrooms such as C, versicolor and G, applanatum, whose mycelial growth was fast on the medium, while that of G. lucidum, whose mycelial growth was relatively slow, was decreased by the treatment.

• The Korean Journal of Mycology
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• v.17 no.4
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• pp.189-193
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• 1989

Ganoderma lucidum formed uniquely non-basidiocarpous basidiospore (NBB) from the aerial mycelia on agar media without the normal basidiocarps. Light was necessary for NBB formation. Best sporulation was obtained at the periodic exposure of 16 hour light and 8 hour darkness for more than 8 days. Effective wave length was blue and yellow but non sporulation was induced by near U.V. light. Effective light intensity for NBB bearing appeared to be about 1,000 Lux as white light. Photomorphogenetic responses in Ganoderma lucidum were clearly different among strains of the fungus.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.6A
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• pp.425-432
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• 2003

In this paper, we designed a multi-carrier digital transmitter for CDMA base-station using a direct conversion scheme and verified the performance through circuit simulations. We examined a new technology required to design a multi-carrier transmitter, then designed and simulated a multi-carrier digital transmitter. ADS (Advanced Design System), RF simulation S/W of Agilent Technologies, was used for designing and simulating the multi-carrier digital transmitter. First, we simulated a digital block and an analog block separately, then performed a co-simulation for entire system. From the results, the final analog outputs of the designed multi-carrier digital transmitter met the spectrum mask characteristics of IS-97 & 3G TS 25.104 standard requirements. It means that proposed scheme could be applied to implement a multi-carrier digital transmitter for CDMA base-station. Therefore, proposed multi-carrier digital transmitter using a direct conversion scheme can accomplish cost-reduction and improvements of technology in the next CDMA base-station.

• The KIPS Transactions:PartA
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• v.14A no.4
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• pp.227-234
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• 2007

In the virtual prototyping environment, we can simulate details of a target model using many components and libraries provided in advance on a computer. The real prototyping environment provides the test simulation environment as a real product, but we can't do a detailed simulation of a real product in the virtual prototyping environment, and we can't do various simulations in the real prototyping environment. So, we made a integrated prototyping environment for linkage of the two types of prototyping environments. Also, in this paper, we developed the integrated prototyping environment based on objects. By this kind of embedded system development environment, we can have the advantages as reuse, flexibility, scalability, and more convenient of product making.

• Proceedings of the KIEE Conference
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• 2003.07d
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• pp.2331-2333
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• 2003

전력계통의 원방감시제어시스템(SCADA)은 원방의 전력계동을 화면에 표시하고 감시하며 필요한 제어명령을 실행하는 시스템을 말한다. 철도청의 기존 전력계통 제어시스템은 UNIX를 기반으로 하여 특별히 교육 받은 운용자만이 감시제어 및 관리할 수 있고 구축비용이 많이 소요되며 지역 사무소에서 운용되기 때문에 원격지의 전력계통 사고의 경우 시스템 운용자는 현장의 근무자와 연락하여 사고의 원인을 파악하고 조치해야 하는 단점이 있다. 또한 새로운 통합 SCADA 시스템이 구축되면서 기존 지역사무소에서 운용하던 전력계통 제어시스템이 없어지고 중요 역사마다 지역사무소의 전력계통 제어시스템을 대체할 수 있는 소규모 전력계통 제어시스템의 설치가 요구되고 있다. 본 논문에서는 기존 UNIX를 기반으로 한 SCADA 시스템의 기능을 모두 수용하고 현장의 근무자들이 쉽게 감시제어 및 유지보수까지도 할 수 있는 경제적인 전력 계통 제어시스템을 개발하고자 한다. 소규모 전력 계통 제어시스템을 개발하기 위해 Cimon 이라는 산업자동화프로그램을 이용하였으며 철도청 철암 역사에 직접 시스템을 설치하여 원격소 장치(RTU)와 새로 추가 설치된 전자식배전반을 동시에 수용할 수 있는 소규모 전력계통 제어시스템을 개발하고 실험하였다.

• Development and Reproduction
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• v.10 no.3
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• pp.193-196
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• 2006

The process in the formation of primordial germ cells, primitive and early gonadogenesis were investigated by histological examination for the reproductive physiological study in the scorpion fish, Sebastiscus marmoratus. The primordial germ cells about $10\;{\mu}m$ in diameter were observed in the fibrous mesenchymal tissue located between gut and mesonephric duct of the larvae within the maternal body. As the fibrous epithelium extends to the direction of peritoneum, the primordial germ cells moved. From 31 days post parturition, the fibrous epithelium gets thicker, and the primitive gonad starts to form. From 49 days post parturition, as the primitive gonad of the primitive gonad extend, it starts to form cavity, and about 60 days post parturition, the formation of the ovarian cavity is completed. From 79 days post parturition, germ cells proliferated along the inner edge of the ovarian cavity.

• Korean Journal of Digital Imaging in Medicine
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• v.10 no.1
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• pp.35-40
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• 2008

I.objective The composition method with acquiring 2${\sim}$5 image not only lack perfection in compensating the geometrical distortion but could also cause inaccurate connection problem of compensating the geometrical distortion but could also cause inaccurate connection problem of continuing bone structure due to the enlargement ratio difference of ruller and bone, density difference in image composition process. This paper studies those mentioned problems through the experiments. II. Object and method Experiment 1 After attaching 3 step wedge(Pb) on detector and 2 ruller on upper, lower part of the step wedge, we have exposed them to create density difference between 1st image and 2nd image, then examined if there were any errors. Experiment 2 1st 100cm ruller was attached on the center of detector, and by escalating the distance between 2nd 100cm ruller and detector 5cm, 10cm, 15cm respectively, we investigated if there any errors caused by enlargement ratio. Experiment 3 The ruller was placed on detector, a joint photographing was performed through spot photographing after fully operating the electric field photographing to include hip joint ${\sim}$ ankle joint part and we have compared the values from two methods. III. Result : A horizontal axis error was caused when photopraphing is not poerated in equal density since the image shifted horizontally in accordance with the difference of Pb step wedge 1 due to the density difference, as the result of Epperiment 1.