• Journal of Plant Biology
• /
• 제13권1호
• /
• pp.25-32
• /
• 1970

Ecological study on the reclaimed high saline soil was carried out throughout a year(1969) to elucidate the changes of the structure of halophytes communiteis and the possibilities of desalination from high saline soil by absorption of chloride ion. Results from this studies are summarized as followings; 1) The growth rates of halophytes showed a variation; maximum growth rate of Salicornia appeared on August, Chenopodium on July, Suaeda on July, Aster on August and Scirpus on June. 2) Changes of frequency of each halophyte were varied in accordance with species. Chenopodium and Salicornia have the highest frequency of all on May. However, frequency as well as density of halophytes decreased after on May due to competition for absorbing moisture in plant communities. 3) The terrestrial plants which were succeed into the reclaimed tidal land had herborized 25 species on the both side of irrigation route. 4) Each of the maximum chloride uptake by halophytes appeared on May(Salicornia and Aster), on June(Chenopodium and Scirpus), and on August(Suaeda), respectirecely 5) Among the halophytes, Salicornia was confirmed to absorb the highest amount of chloride. A possible amount of chloride uptake by all halophytes per 100 square cm reached about 24,629. ppm.

• 대한수의학회지
• /
• 제10권2호
• /
• pp.21-51
• /
• 1970

Series of experiments were conducted to determine lethal does of X-ray and Neutron on Toxoplasma gondii. strain RH and IRI. As well morphological changes of Toxoplasma gondii irradiated or not were compared by use of electron microscope. The pathogenicity test of the irradiated and nonirradiated Toxoplasma gondii was made in mice guinea-pigs, rabbits and pigs: The letahl dose of X-ray and Neutron on RH and IRI strain and the growth rate between two strains after irradiation were shown little differences. Morphological changes were not observed until 18th passage was made. After then, the growth rate was decreased apparently, and atrophied forms were frequently observed in electron microscope. Survival time of animals inoculated with irradiated strain was longer than that of animals giving non-irradiated strain, and Toxoplasma gondii were isolated from all the dead animals. But it is of interest that pigs survived after injection of Toxoplasma gondii remained health and much attempts were failed toisolate Toxplasma gondii remained health and much attempts were slaughtered them. Animals were succumbed after injection of Toxoplasma gondii without any relationship with serum titers. (HA antibody).

• Asian-Australasian Journal of Animal Sciences
• /
• 제27권9호
• /
• pp.1303-1310
• /
• 2014

A 12 week growth study was carried out to investigate the supplemental effects of dietary garlic powder (GP) on growth, feed utilization and whole body composition changes of fingerling sterlet sturgeon Acipenser ruthenus (averaging weight, 5.5 g). Following a 24-h fasting, 540 fish were randomly distributed to each of 18 tanks (30 fish/tank) under a semi-recirculation freshwater system. The GP of 0.5% (GP0.5), 1% (GP1), 1.5% (GP1.5), 2% (GP2) and 3% (GP3) was added to the control diet (GP0) containing 43% protein and 16% lipid. After the feeding trial, weight gain (WG) of fish fed GP1.5, GP2 and GP3 were significantly higher (p<0.05) than those of fish fed GP0, GP0.5 and GP1. Feed efficiency and specific growth rate (SGR) showed a similar trend to WG. Protein efficiency ratio of fish fed GP1.5, GP2, and GP3 were significantly higher (p<0.05) than those of fish groups fed the other diets. A significant difference (p<0.05) was found in whole body composition (moisture, crude protein, crude lipid, ash, and fiber) of fish at the end of the experiment. Significantly higher (p<0.05) protein and lipid retention efficiencies (PRE and LRE) were also found in GP1.5, GP2, and GP3 groups. Broken-line regression model analysis and second order polynomial regression model analysis relation on the basis of SGR and WG indicated that the dietary optimal GP level could be greater than 1.77% and 1.79%, but less than 2.95% and 3.18% in fingerling sterlet sturgeon. The present study suggested that dietary GP for fingerling sterlet sturgeon could positively affect growth performance and protein retention.

• 한국정보통신학회:학술대회논문집
• /
• 한국정보통신학회 2022년도 추계학술대회
• /
• pp.357-359
• /
• 2022

지속적으로 악화되고 있는 공기, 토양 및 수질 등 주요 환경오염과 코로나 팬더믹에 의한 생활 패턴의 급진적인 변화로 인해 온라인 유통에 의한 친환경 식재료의 시장이 급성장하고 있다. 그리고 사회 구조 변화에 따른 인구 고령화 및 농업 관련 인구 감소하고 있는 가운데 아쿠아포닉스는 노후 경제 활동 자립, 환경 보호, 건강하고 안전한 먹거리 확보 등 문제들을 해결할 수 있는 시스템으로 부각되고 있다. 본 논문에서는 기존 아쿠아포닉스 시스템에 여러 ICT 기술을 융합하여 최적 생육환경도출 및 정량생산예측을 위한 지능형 아쿠아포닉스 생산관리 모듈 중 지능형 식물 성장 측정 시스템을 설계하고자 한다. 특히 고성능의 처리 자원을 갖지 않는 생산 현장에 적합한 시스템 설계에 주안점을 두고, 생산 환경과 학습 데이터 및 판단 시스템을 위한 모듈 구성 방안을 제안하고자 한다.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2003년도 하계종합학술대회 논문집 I
• /
• pp.597-600
• /
• 2003

Wireless Internet access shows an early-stage market that is entering a period of strong and sustained growth., reaching almost $40 billion in combined related equipment services by 2008 with equipment and services of nearly equal proportion. This explosive development is possible due to the continued growth of two of the most successful markets in history, the internet and mobile telephony. The number of global wireless internet users will incense from approximately 1.9million in 2001 to 1.3billion by 2006. Technological changes are the main factor in the emergence of what is being called the fourth generation of mobile communications.

• Journal of Welding and Joining
• /
• 제13권3호
• /
• pp.46-54
• /
• 1995

The structural changes of Al-Cr alloys due to the difference in the growth rates were investigated in the study using the water cooled copper chill apparatus, the levitation apparatus, and the melt spinner. Growth rate was evaluated by means of thermal analysis could measured the cooling rate up to 10$^{5}$ K/sec. The transformation from the cell structure to the massive transformed structure was obtained the Al-3.43wt%Cr alloy in the melt spinner method.

• 한국도서관정보학회지
• /
• 제25권
• /
• pp.207-223
• /
• 1996

Nowadays, the wide spectrum of changes have been occurred in library world. It is essential for librarians to improve their professionalization standards to convert these changes into the o n.0, pportunity of growth. The device of improvement of professionalization standards is following: 1. Librarians have to receive formal and informal education and learn to advance in knowledge and skill concerning library affairs continually. 2. Self learning has to be transform into learning organization. 3. Education of Librarianship concentrate mainly in practical and technical study by this time but it is indispensable to develop the theory and philosophy of librarianship.

• Asian-Australasian Journal of Animal Sciences
• /
• 제8권1호
• /
• pp.51-58
• /
• 1995

To examine whether colostral growth factors are transferred to the general circulation, concentrations of plasma cortisol, insulin, prolactin, growth hormone, insulin-like growth factors(IGFs) -I and -II, IGF-binding proteins(IGFBPs) and total protein were measured in newborn calves fed colostrums, milk of milk replacer before and after feeding at 12 h intervals during the first two days after birth. Plasma protein concentrations increased with time after than in milk- or milk replacer-fed calves. The mean protein concentration was greater in colostrum-fed than in milk- or milk replacer-fed calves. Plasma cortisol levels transiently declined after each feeding regardless of the type of diet, while insulin levels tended to increase. Mean concentrations of these hormones did not differ between dietary groups, nor did they change with time after birth. Plasma concentrations of prolactin and growth hormone did not differ between dietary groups and also did not change with time after birth or after feeding. Concentrations of IGF-I and IGF-II transiently increased at the second feeding period, but these, as well as plasma IGFBP profiles, were not different between groups or before and after feeding. Results did not indicate significant transfer of colostral growth factors across the newborn ruminant small intestine.

• 동력기계공학회지
• /
• 제18권2호
• /
• pp.62-69
• /
• 2014

In this paper, in order to investigate the effects of marco and microscopic observations of fatigue crack growth in friction stir welded (FSWed) 7075-T651 aluminum alloy plates, fatigue crack growth tests were performed under constant amplitude loading condition at room temperature with three different pre-cack locations, namely base metal (BM-CL) and two kinds of pre-crack locations in welded joints, weld metal (WM-CL) and heat affected zone (HAZ-CL) specimens. The fatigue crack growth behavior of FSWed 7075-T651 aluminum alloy plates were discussed based on the marco and microscopic fractographic observations. The marcoscopic aspects of surface crack growth path for BM-CL and HAZ-CL specimens indicate relatively straight lines, however, the crack growth paths of WM-CL specimens grow first straight and by followed toward the TMAZ and HAZ. The microscopic aspects of fatigue fracture for BM-CL and HAZ-CL specimens indicate typical fatigue striation, but WM-CL showed intergranular fracture pattern by micro structural changes of FSW process.

• 한국수산과학회지
• /
• 제57권4호
• /
• pp.364-371
• /
• 2024

We studied the age and growth of anchovies Engraulis japonicus, collected using three different fishing gears (drag net, set net, and bottom trawl) in the South Sea of Korea from November 2020 to October 2021.To determine the age, 344 speciemens were analyzed by reading the otolith sagittal plane. Monthly changes in the growth of translucency at the edge and the marginal increment ratio revealed that annuli in otoliths were fully formed in March once a year. We compared four different types of growth equations, and found that the data set of observed length at age (yearly) as estimated the growth parameter (L_∞ = FL 16.17 cm, k = 0.33/year, t₀ = -1.65) fitted well on the von Bertalanffy growth curve.