• Fisheries and Aquatic Sciences
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• 제17권4호
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• pp.441-448
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• 2014

We examined the effects of dietary nutrient content, feeding period, and feed allowance on compensatory growth, food use, chemical composition, and serum chemistry of juvenile olive flounder Paralichthys olivaceus. We placed 720 juvenile fish into 24 400-L flow-through round tanks (30 fish per tank).A $2{\time}2{\time}2$ factorial design (diet: control (C) and high protein and lipid (HPL) ${\time}$ feeding period: 8 and 6 weeks ${\time}$ feed allowance: 100% and 90% of satiation) was applied. Fish were hand-fed twice daily, based on the designated feeding schedule. Weight gain and food consumption were affected by both the feeding period and feed allowance, but not by diet. The food efficiency ratio was not affected by diet, feeding period, or feed allowance, but the protein efficiency ratio and protein retention were affected by diet and feeding period, respectively. We found that the full compensatory growth of fish was not achieved at a restricted feeding allowance.

• 융합신호처리학회논문지
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• 제7권4호
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• pp.178-183
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• 2006

As a lot of researches on the speech signal processing are performed due to the recent rapid development of the information-communication technology. the pitch period is used as an important element to various speech signal application fields such as the speech recognition. speaker identification. speech analysis. or speech synthesis. A variety of algorithms for the time and the frequency domains related with such pitch period detection have been suggested. One of the pitch detection algorithms for the time domain. AMDF (average magnitude difference function) uses distance between two valley points as the calculated pitch period. However, it has a problem that the algorithm becomes complex in selecting the valley points for the pitch period detection. Therefore, in this paper we proposed the modified AMDF(M-AMDF) algorithm which recognizes the entire minimum valley points as the pitch period of the speech signal by using the rotation transform of AMDF. In addition, a threshold is set to the beginning portion of speech so that it can be used as the selection criteria for the pitch period. Moreover the proposed algorithm is compared with the conventional ones by means of the simulation, and presents better properties than others.

• 한국정밀공학회지
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• 제24권9호
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• pp.76-85
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• 2007

An optical rotary encoder is easy to implement for automatic control applications. In particular, the output of the encoder has a digital form pulse, which is also easy to be connected to a popular digital controller. By using the encoder, there are various angular velocity detecting methods, M-, T-, and M/T-method. Each of them has a property of its own. They have common limitation that the angular velocity detection period is strongly subject to the destination velocity magnitude in case of ultimate low range. They have ultimate long detection period or cannot even detect angular velocity at near zero velocity. This paper proposes a dual encoder system with two encoders of normal resolution. The dual encoder system is able to keep detection period moderately at near zero velocity and even detects zero velocity within nominal period. It is useful for detecting velocity in case of changing rotational direction at which there occurs zero velocity. In this paper, various experimental results are shown for the dual encoder system validity.

• Journal of Nutrition and Health
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• 제22권2호
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• pp.108-117
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• 1989

The purpose of this study was aimed to investigate the historical tends of population growth which has reflected direct effect of the ratio of food self sufficiency in Korea between the year of 1910 and 1980. Author divided the whole years between 1910 and 1980 into five different periods ; colonial period from 1910 to 1945, post colonial period from 1945 to 1950, Korean war period from 1950 to 1955, post Korean war period from 1955 to 1960, fast economic growing period 1960~1980. The ratio of national food self sufficiency has been profoundlly affected by dual factors ; rate of population group and increment of GNP which reflect the national economic development. Total food production never reached the level of population growth ratio in Korea. As a result food demand and supply has shown imbalaced condition which leads to import foods from outside contury to compensate food shortage. The increment of GNP sharply cut down the cereal consumption. The consumption of fish, milk, eggs and meat reflected to increase since 1970.

• 산업경영시스템학회지
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• 제32권4호
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• pp.161-168
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• 2009

The most generalized form of the triadic operating policy for an M/G/1 queueing model is developed. It consists of three simple N, T and D operating policies and has a peculiar structure possessing concepts of dyadic policies. Using the concept of the pseudo probability density function of the busy period, its expected busy period for the controllable M/G/1 queueing model is derived. Since the obtained result is the most generalized form the triadic polity, the expected busy periods for all known dyadic policies are recovered as special cases from it.

• 생물환경조절학회지
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• 제19권4호
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• pp.257-265
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• 2010

본 연구는 수경재배시 산호수 생육과 개화를 증진시키기 위한 적절한 질소농도 및 공급시기를 구명하기 위해 수행하였다. 질소농도가 120, 150, 180, $210mg{\cdot}L^{-1}$로 조성된 양액을 1년생과 2년생 Ardisia pusilla에 휴면기(10월~3월) 제외한 기간 급액(ED; except dormancy), 생육 전기간 급액(TG; total growth)으로 나누어 처리하였다. 묘령 및 급액기간에 따른 생육을 비교한 결과 1년생 묘는 급액기간에 관계없이 질소농도 $150mg{\cdot}L^{-1}$ 이상 처리구에서 우수하였다. 2년생묘는 TG기간 동안 급액한 처리구가 ED기간을 제외하고 급액한 처리구들보다 대체적으로의 생육이 훨씬 우수하였으며, 특히 TG-$150mg{\cdot}L^{-1}$의 생육이 가장 좋았다. 개화 후 엽의 무기성분 함량을 측정한 결과 묘령에 관계없이 전체적으로 양액내 질소농도가 증가할수록 T-N의 함량은 높아지고 K, Ca, Mg, P의 함량은 약간 낮아지거나 차이가 거의 없었다. 그러나, 1년생 ED-210 처리구는 모든 처리구 중 Ca와 Mg 함량은 가장 높은 반면 K와 P의 함량은 가장 낮았으며 개화수도 적었다. 즉, 질소농도가 $210mg{\cdot}L^{-1}$ 이상으로 조성되면 오히려 생육이나 개화수가 감소되는 것으로 보아 1년생 산호수는 생장 및 개화를 위해 TG-150으로 처리하고, 2년생 묘는 TG-180이 수경재배시 적정한 급액시기 및 질소농도로 판단된다.

• 품질경영학회지
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• 제29권3호
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• pp.138-150
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• 2001

Recently, industrial environments have been drastically changed. Customers require cheaper, better, stronger products more than ever. Thus companies have to satisfy the requirements of customers to be survived in this kind of industrial environments. To cope with these requirements from customers, engineers in industries must accept new paradigm and use some special tools for developing new product. This study has applied a Concurrent Engineering which would be good for shortening of product development period in developing of Full Logic Deck mechanism using in car audio. In this paper, a real case of systematic approach and successful story of Concurrent Engineering application in developing Full Logic Deck mechanism is illustrated.

• 한국철도학회논문집
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• 제10권6호
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• pp.640-644
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• 2007

고속철도시스템 기술도입은 관련 철도산업을 발전시키고, 타 산업에 파급효과를 주어 철도기술을 동반 발전시켰다. 이에 고속철도시스템의 기술 도입시의 기술이전 및 국산화과정을 검토하고, 기술이전 및 국산화과정에서 나타난 문제점을 분석하였다 그리고 철도시스템 기술을 유지 및 확대하기 위하여 기술이전을 통한 철도산업발전방안이 검토되었다.

• Environmental Analysis Health and Toxicology
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• 제25권4호
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• pp.279-286
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• 2010

Objectives : Platinum nanoparticles (PNPs) are potentially useful for sensing, catalysis, and other applications in the biological and medical sciences. However, little is known about PNP toxicity. In this study, adverse effects of PNPs on the postnatal development of mouse pubs were investigated. Methods : PNPs (size: 20 nm) were prepared and orally administered to mice during premating, gestation, and lactation periods (0.25 mg/kg, 0.5 mg/kg, and 1 mg/kg). Maternal and pup toxicity were evaluated. Results : PNPs did not affect blood biochemical parameters or mortality in dams during the experimental period. Histopathological signs were not observed and pup number was not different between the control and treated groups. Deformity and stillbirth were not observed in the pups. However, PNPs increased pup mortality and decreased the infant growth rate during the lactation period. Conclusion : PNPs may have adverse effects to the postnatal development of mouse pups.

• 대한소아치과학회지
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• 제3권1호
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• pp.48-51
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• 1976

Surveying the developmental degree of the crowns of mandibular first bicuspid in 566 korean children (264 males and 302 females) from 3 to 7 years of age by oblique cephalogram, the author got to the following results. 1. The developmental degree of the tooth crown of mandibular first bicuspid was earlier in female than in male. 2. The period of complete development of the crown of mandibular first bicuspid was 7 year 1 month in male and 6 year 3 month in female. 3. There was no significant difference in the period of complete development of the tooth crown compared with that of Japanese and American children.