• Journal of Biosystems Engineering
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• v.20 no.3
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• pp.226-235
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• 1995

An unmanned speed sprayer was developed using a remote control and an inductive cable guidance systems to protect operators and environment from hazardous pesticides. The sprayer consists of a remote control system, an induction system, obstacle detectors, control actuators and an one-chip microcomputer. The sprayer can be operated by the induction guidance and/or remote control. The following summarize characteristics of the developed speed sprayer. 1) Both the remote control and the induction guidance operation were possible with the developed speed sprayer. 2) Sixteen functions of the forwarding, backing, halting, steering, 3-way valve for nozzles and fan operating etc. were utilized on the remote control system. 3) It was concluded that the DTMF method, having less transmitting error, performed better than the FSK method for an agricultural remote controller. A radio station may be necessary. 4) The digital inductive guidance system, consisting of five low-impedance detection coils and a window comparator circuit, performed better than the analog detecting system, guiding route using inductive voltage differential from tow detection coils.

• The Korean Journal of Ecology
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• v.23 no.3
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• pp.217-221
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• 2000

The vegetation of Maemul, Somaemul and Eoyu islets in Tongyeong-si was investigated from September, 1996 through August, 1997. In order to analyze the vegetation of this islets, synthesis table, actual vegetation map were prepared. The predominant species of the islets was Camellia japonica. and the vegetation in this study area was classfied into 4 communties (included 1 afforestation) and 7 subcommunities 1 . Camellia japonica community 1) Typical subcommunity 2) Machilus thunbergii subcommunity 3) Castanopsis cuspidata var, thunbergii subcommunity 4) Ligustrum obtusifolium subcommunity 5) Carpinus coreana subcommunity 6) Selaginella tamariscina subcommunity 7) Pinus thunbergii subcommunity 2. Pinus thunbergii community 3. Alnus firma afforestation 4. Miscanthus sinensis var. purpurascens community.

• Journal of Aquaculture
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• v.7 no.4
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• pp.207-223
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• 1994

Induction of triploid cherry salmon, Oncorhynchus ma.sou was performed by the heat shock procedure. The triploids were induced by 15 and 20 min heat shock treatments after 10 min fertilization at $28^{\circ}C$. Incidences of the triploidy were $91.4\%\;and\;89.8\%$, respectively. Nucleus and erythrocyte from the induced triploids larger than those of the diploids in major axis, minor axis, major axis/minor axis, surface area and volume. The chromosome number of diploid was 2n= 66 (17 pairs of metacentrics or submetacentrics, 16 pairs of acrocentrics or telocentrics), and that of triploid was 3n=99. Satellites were observed in the short arm of the largest telocentrics, and these may be useful marker to determine the polyploidization. Diploid have outgrown to triploid, and female have also outgrown to male in the triploid group during the 22 months of observation period after hatching. During the spawning season, 22 to 26 months after hatching, diploid were observed the growth retardation because of their sexual maturation, however the triploid showed continuous growth.

• Journal of Aquaculture
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• v.5 no.2
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• pp.109-115
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• 1992

Effects of intraperitonial injections of human chorionic gonadotropin (HCG) on ovulation and spawning of the loach, Misgurnus mizolepts, were investigated. Matured females spawned successfully by a single dose of 6 IU (HCG) per gram body weight. Spawning usually occured 13 to 25 hours after hormone injection. Most of the eggs were fertilized and hatched normally. Fertilization rate, hatching percentage and Pseudo-gonadosomatic index were not correlated with increasing HCG doses. For the study of multiple spawning of this species, fatness, hepatosomatic and gonadosomatic indices of artificially spawned females were checked for 42 days after first spawning. According to this result, females could spawn again 40 days after first spawning.

• 한국신재생에너지학회:학술대회논문집
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• 2006.06a
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• pp.265-268
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• 2006

인버터의 개발에 앞서 살펴야 할 것 중 하나로 부하의 종류이다 여기에서는 유체부하를 가지는 경우이다 경제적인 측면과 성능을 고려하여 마이크로컨트롤러(PIC18F4431)를 결정하였다. 또한 여기에서는 전반적인 인버터의 제어를 다루기보다는 유체부하에서 발생하기 쉬운 과부하상태시의 간단한 제어방안을 다루었다 유도기제어에 있어서 유체부하를 가지는 경우 갑작스러운 유체부하의 증가가 발생할 수 있다. 유도기에서 이와 같은 과부하가 발생할 경우 전압과 전류의 위상차는 줄어들게 되고 전류는 증가하게 되며 유도기의 실제 속도와 인버터의 지령치는 벌어지게 된다. 지속적으로 위상차를 감시하여 과부하 상태를 판별할 수 있으며 과부하 상태 시 속도를 변화시켜 실제 속도를 정상상태와 비슷하게 유지시켜준다.

• Annual Conference on Human and Language Technology
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• 1997.10a
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• pp.296-302
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• 1997

본 논문은 일본어 작문지원시스템에 관한 것으로서, 사용자가 일본어에 대한 언어지식이 전혀 없더라도 한국어 작성 능력만으로 일본어를 작문할 수 있도록 지원하는 일본어 작문지원 시스템 개발 방법에 관한 것이다. 본 논문에서 제안하는 일본어 작문지원 시스템은, 사용자가 일어로 작문하고자 하는 문장을 한 국어의 어절단위 또는 연속된 문자열로 작성해 나가면, 시스템이 자동개입하여 한국어 분석기술과 일본어로의 변환/생성 기술로 일본어의 대응 문자열을 생성해 준다. 따라서 한국어 작성능력만으로 일본어를 작문할 수 있도록 지원한다. 특히, 한국어 분석의 중의성과 일본어 변환시 대응어 선택의 중의성 문제가 있을 경우에는, 사용자가 시스템이 사용자 대화창에 제공하는 한국어 도움말 정보를 참조하여 선택함으로서 문제점을 해소하여 정확한 작문을 유도한다.

• Proceedings of the Korea Contents Association Conference
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• 2017.05a
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• pp.9-10
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• 2017

현대의 전시는 관람객과의 소통에 기반을 둔 인터랙션(interaction) 장치를 사용하여 상호작용적인 기법을 많이 사용하고 있다. 이러한 인터랙티브(interactive) 전시는 관람객들을 유도하기 위한 다양한 어트랙티브 요소를 적용한다. 이 발표에서는 인터랙티브 전시에서의 어트랙티브(attractive) 요소들을 분석하여 장점과 단점을 파악해 보고, 보다 원활한고 용이한 관람객 유도방법들을 도출해 보고자 한다.

• Journal of Aquaculture
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• v.10 no.1
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• pp.39-47
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• 1997

Induction of hybrid and allotriploid between female rainbow trout, oncorhynchus mykiss and male cherry salmon, O. masou were performed. Triploid rate in allotriploid was 92% and the survival rates of allotriploid exceeded that of their hybrid counterparts. Karyological studies revealed that the hybrid had exactly the same intermediate diploid karyotypers as that of two parental species, while allotriploid had two sets of the maternal haploid complement and one set of the paternal haploid complement. Hybrid revealed an intermediate size in celluar and nuclear size of erythrocyte, while allotriploid revealed larger cellular and nuclear size of erythrocytes than hybrid. The number of nucleolar organizer regions of hybrid were 1 or 2, while those of allotriploids were 1, 2 or 3. These results proved that allotriploidization can lead to increase cytogenetical characters compared to counterpart hybridization.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.29 no.10C
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• pp.1363-1369
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• 2004

LDPC(Low Density Parity Check) codes are described by bipartite graphs with bit nodes and parity-check nodes. Tanner derived minimum distance bounds of the regular LDPC code in terms of the eigenvalues of the associated adjacency matrix. In this paper we generalize the Tanner's results. We derive minimum distance bounds applicable to both regular and blockwise-irregular LDPC codes. The first bound considers the relation between bit nodes in a minimum-weight codeword, and the second one considers the connectivity between parity nodes adjacent to a minimum-weight codeword. The derived bounds make it possible to describe the distance property of the code in terms of the eigenvalues of the associated matrix.

• Korean Journal of Ichthyology
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• v.6 no.2
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• pp.206-221
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• 1994

Morphometrical data for diploid and induced triploid cherry salmon, Oncorhynchus masou were analyzed prior to the spawning season to compare their commercial values. The following traits were measured with the diploids and induced triploids : ungutted and gutted body weight; body length; dressing percentage; condition factor; gonad weight and gonad index; belly thickness; viscera weight; viscera index; body circumference at the pelvic, dorsal and anal fins; area of the cross sections at the pelvic and dorsal fins; two belly thickness traits measured on each cross section; total height, height and width of each cross section; three body shape traits; and nine cross section shape traits. Body length and body weight of diploids were larger than those of induced triploids and dressing percentage, gonad weight, gonad index, viscera index, and liver index were also larger in diploids. However, induced triploids showed higher values in one belly thickness trait and some section shapes than diploids. Differences in body traits were due to the sterility of induced triploids. Therefore, induced triploid cherry salmon appears to have greater potentials for the commercial values than their diploids.