• International Journal of Industrial Entomology and Biomaterials
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• v.14 no.2
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• pp.127-135
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• 2007

Precocious metamorphosis was induced in two popular bivoltine breeds i.e. YB and $NB_4D_2$ by an imidazole compound having anti-juvenile hormone activity. The chemical was administered by feeding treatment with mulberry leaf to freshly moulted (0-6 hrs) IV instar larvae. The dose of the chemical was found to be breed specific being 650 ppm for YB and 500 ppm for $NB_4D_2$. The chemical caused complete skipping up of the fifth instar larvae which is most susceptible to diseases. But IV instar was somewhat prolonged. As a result the total larval period was reduced by 4-5 days. However, some of the rearing and reeling parameters like cocoon yield, cocoon weight, shell weight, shell %, filament length and fecundity were reduced for that particular generation only. The effective rate of rearing (ERR %) was significantly increased in trimoulters during the most unfavourable August - September seed crop season. Number of cocoons / kg and number of male moth were significantly higher in trimoulters. These may be useful for preparation of $multi{\times}bi$ hybrid seed. Fine denier was also found in trimoulter cocoon which is the cause of getting fine silk filament from trimoulter cocoons. Normal mating behaviour and emergence pattern was recorded in trimoulters. Bivoltine trimoulter males also showed competence for mating with multivoltine females. These results suggest the possibility of getting trimoulter males during hot and humid seasons when rearing of bivoltine is almost impossible particularly in Eastern and North Eastern India.

• Journal of the Korean Home Economics Association
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• v.40 no.3
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• pp.155-164
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• 2002

This study was conducted to investigate the differences in environmental and psychological factors in children with obesity and to offer useful information for obesity treatment and prevention. 123 children of 5-6th grade in elementary school and their mothers were included in this study and divided into either the obese group and normal group(obese group: 61, normal group: 62) according to the Weight-Length Index(WLI). Results showed that between the two groups there no significant differences in family income, mother's occupation status, educational level, and anthropometric measurement. Nutritional knowledge in the obese group was significantly higher than that of the normal group(p<0.05). The mothers of children with obesity had a higher level of nutritional knowledge than the mothers of normal children(p<0.05). There were no significant differences in food behavior between the obese and normal groups. There were no significant differences in maternal child-rearing practices and in maternal attitude on flood behavior of children. Considering psychological factors ; 72.1% of the children with obesity appraised their body image as obese(p<0.05), and 54.1% of the mothers in obese group perceived their child's body shape as obese(p<0.05). The level of self-esteem were not significantly different when compared between the obese and normal groups. From these results, it was suggested that effective measures for obesity treatment and prevention should include nutritional monitoring, and such efforts need to be maintained in order to help the obese children and their mothers.

• Korean Journal of Child Studies
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• v.28 no.2
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• pp.251-265
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• 2007

Participants in this study were 1.245 4th and 5th graders and their parents from 8 elementary schools in Seoul, Daejeon, and Pusan. Using the Korean Youth Self-Report (K-YSR), children's behavior problems were measured and assigned to either clinical or normal groups. Between group differences were that the educational level of mothers of internalizing girls was lower than that of normal girls. Girls with internalizing problems had more siblings than normal girls. Parents of both boys and girls with either internalizing or externalizing problems were more rejecting and/or permissive than parents of children without behavior problems. Fathers of children with behavior problems perceived more marital conflicts, while mothers whose children have behavior problems had more negative family-of-origin experiences compared to parents of normal children.

• Korean journal of applied entomology
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• v.58 no.1
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• pp.69-76
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• 2019

This study was evaluated to increase the production efficiency of Gryllus bimaculatus De Geer, which are recently increasing attention as industrial insects in Korea. In this study, the hatching rate and larval period were investigated along with temperature and humidity, as well as the survival rate and ovipositional temperatures along with rearing density. The optimum relative humidity for hatching was highest at 90%, which shows the hatching rate of 90%. The highest hatching rate was 98.3% at $20^{\circ}C$. The hatching period was shortest at $35^{\circ}C$ incubation, which shows 7.1 days in average. The survival rate at 3,000-20,000 individuals in the breeding container was 34-18% after rearing for 35 days. In the effect test of feeding vegetables, the survival rate was 1.8 times and the biomass weight 2.5 times higher than that of normal individuals respectively. The number of laying eggs by temperature was highest at $25^{\circ}C$, which shows 1,710 eggs after reading for 30 days.

• Journal of Sericultural and Entomological Science
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• v.35 no.1
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• pp.11-16
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• 1993

Field experiment and silkworm rearing were conducted for 4years in an attempt to reduce phosphorus fertilizer in mulberry field with high levels of phosphate. Experiments consisted of four treatments; normal recommended P application(13kg P2O5/10a), half, null and no fertilizer on each of 3 mulberry fields, two fields with 300ppm and one filed begining with 450ppm of aviable P2O5 content in soil. One of 300ppm fields was used for leaf quantity and one for leaf quality test by silkworm rearing. Leaf yield in the 300ppm field decreased after the 3rd spring in the no phosphorus treatment and in the 4th fall in the half phosphorus treatment. No yield decrease occurred in 450ppm field for 4 years. Yield decrease did occur in the next rearing season after soil phosphate content in the 10~20cm zone dropped below 150ppm. Phosphorus fertilizer should be applied at this time. Though P2O5 concentration in leaves of no phosphorus treatment was 0.18% lower that that of conventional treatment, there were no difference in cocoon quality.

• Journal of Biosystems Engineering
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• v.31 no.5 s.118
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• pp.436-442
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• 2006

This research was conducted to design and develop a wired monitoring system for judging if sick or dead layers (SDL) exist in multi-tier layers battery (MLB) by machine vision, and to analyze its performance. In this study, 20 Brown Leghorn (Hi-Brown) layers aged 37 weeks old, were used as the experimental animals. The intensity of concern paid by layers on feed was over 90% during 5 minutes and 30 seconds after providing feed, and normal layers (NL) had been standing to take feed for that period. Therefore, in this study, the optimal judging time was set by this test result. The wired monitoring system developed was consisted of a driving device for carrying machine vision systems, a control program, a RS232 to RS485 convertor, an automatic positioning system, and an image capture system. An image processing algorithm was developed to find SDL in MLB by the processes of binary processing, erosion, expansion, labeling, and reckoning central coordinate of the captured images. The optimal velocity for driving unit was set up as 0.13 m/s by the test results for wired monitoring system, and the proximity switch was controlled not to be operated for 1.0 second after first image captured. The wired monitoring system developed was tested to evaluate the remote monitoring performance at lab-scale laying hen house. Results showed that its judgement success.ate on normal cage (without SDL) was 87% and that on abnormal cage (with SDL) was 90%, respectively. Therefore, it would be concluded that the wired monitoring system developed in this study was well suited to the purpose of this study.

• Journal of Biosystems Engineering
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• v.32 no.3
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• pp.173-178
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• 2007

This research was conducted to develop and analyze a wireless monitoring system for judging if sick or dead layers (SDL) exist in multi-tier layers battery (MLB) by machine vision, and to evaluate the performance between a wired monitoring system and it. This study used the AP (Access Point), the RS-285 to RS-232 converter, RS-232 to Ethernet converter, PICBASIC board and upgraded lump image processing method to change wired monitoring system into wireless monitoring system. The system was tested at a pilot farm and farm layer house. Results showed that monitoring judgement success rate at a pilot farm on normal cage (without SDL) was 82.3% and that on abnormal cage (with SDL) was 87.5%, respectively. And communication performance test results showed at farm layer house was $700{\sim}900$ kbps while equipments operated. There were dropped slightly than performance of wired monitoring system, however, the quantity was too small to make a significant difference of performance of the controling system developed for wireless communication.

• Journal of Animal Environmental Science
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• v.17 no.sup
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• pp.7-20
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• 2011

This study was conducted to analyze the mixing ratio of raw feed materials for the methane mitigation and also to identify the minimum rearing density for improving the productivity of beef calves as eco-friendly fodder. Raw materials used in this study for the formulation of feed for methane reduction were crushed corn and alfalfa along with other 21 species. In addition, to investigate the appropriate rearing density, 12 Hanwoo calves with average weight of 150 kg was selected and experiment was conducted for four months. Methane gas emission (Bo) is about 3-4 times less in TMR 4 compared to TMR 1, 2 and 3. Feed price calculated for TMR 4 ration was also affordable. In addition, all TMRs showed a normal ruminal pH. Disappearance rate was observed to be lower in TMR 4 as compared to TMR 1, 2 and 3, but methane production decreased by 24 to 37%. The result showed improved total body weight, average daily gain and feed conversion ratio in rearing low-density ($18m^2/head$), and general treatment ($9m^2/head$) compared to overcrowding treatment ($6m^2/head$). In addition, blood components (total protein, glucose, AST, ALT and GGT factors) involved in health and disease treatments and health-related nutrition metabolism are lower in the low-density and general treatment compared to the high density treatment. Postural development (development of body size) i.e., weight, height and width significantly increased in the low and general density treatment compared to high density treatment. Especially excellent improvement was observed in low-density treatment than the general treatment. Moisture content, colonic bacteria and coccidium are higher in low and high density treatments than in the general treatment. The adequacy for beef rearing density is considered to be more desirable in an area more than $6m^2/head$. In conclusion, present study suggests that possibility of methane reduction through adjusting mixed feed ration. Also, rearing density is also an important factor in the growth and development of beef calves.

• Journal of the Korean Academy of Child and Adolescent Psychiatry
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• v.22 no.4
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• pp.228-235
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• 2011

Objectives : This study was conducted to compare the object relations and parenting behavior of the mothers of children with attention-deficit hyperactivity disorder (ADHD) with that of the mothers with normal children. Methods : In this study, we studied 64 mothers of children who were diagnosed with ADHD and 90 mothers of normal children. The mothers completed the Bell Object Relations Inventory (BORI), the Parenting Behavior Inventory (PBI), the Parenting Stress Index (PSI) and the Parenting Sense of Competence (PSOC) scale. Results : As compared with the mothers of normal children, the mothers of children with ADHD showed significantly different results for the parenting stress and parenting efficacy. For parenting behavior, the mothers of children with ADHD perceived their mothering as being more neglectful. On the other hand, the mothers of the normal control group perceived their mothering as being more affectionate and the fathers as being more reasonable and monitoring. Conclusion : This study suggests there is a significant difference of object relation between the mothers of children with ADHD and the mothers with normal children. The object relation pathology of the mothers of children with ADHD might contribute to impaired parenting behavior. The result of the present study indicate that inadequate grandparental rearing behavior affects the insecure object relation of their child (the mother), and a mother's insecure object relation affects their parental stress and parenting efficacy.

• Journal of Families and Better Life
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• v.25 no.6
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• pp.1-13
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• 2007

The purpose of this study is to examine the college students' and married adults' perceptions of the current low fertility and their motivations of parenthood. It also verifies the gender differences in the numbers of planned children between male and female college students. The sample population included 100 unmarried undergraduate students and 100 married adults. The measurements included in the questionnaire were based on recommendations from the literature review. The major findings of this study are as follows: Women reported higher levels of traditional-normal and altruistic-emotional motivations of parenthood than men did. College students reported higher levels of motivations of parenthood to strengthen biological family ties than married adults did, while adults reported higher levels of martial bond-strengthening, traditional-normal, and gene-preservative motivations of parenthood than students did. College students attributed the current low fertility to the tight labor market and high costs of childbirth and rearing while married adults attributed to gender-discriminating traditional family norms, increasing infertility, and poor conditions of pregnancy and childbirth. Female and adult respondents took the social problems caused by the current low fertility more seriously than their counterparts did.