• The Science & Technology
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• v.33 no.3 s.370
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• pp.66-71
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• 2000

푸른빛을 발산하는 레이저기술이 마침내 한 무명의 과학자(별항참조:무명의 연구가가 완성한 대발명)가 10년간 쏟은 각고의 노력으로 완성되어 세계정보ㆍ통신계에 혁신의 바람을 몰고 오기 시작했다. 2000년 말경에 처음으로 출시될, 푸른 레이저를 이용하는 고화질 DVD 플레이어는 12cm 디스크 양면에 종전의 플레이어보다 2배나 많은 20기가바이트(2백억바이트)의 데이터를 저장할 수 있게 된다. 푸른 레이저는 나아가서 광컴퓨터, 레이저를 이용하는 TV 디스플레이, 무선고속통신장치, 해상도를 두배로 끌어 올릴 수 있는 레이저 프린터 그리고 에너지 효과가 뛰어난 조명등을 포함하여 광범위한 신기술을 창출하여 세상의 모습을 몰라보게 바꿀 것으로 기대된다.

• Journal of the Korean Magnetics Society
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• v.13 no.6
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• pp.251-256
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• 2003

We have developed the quality analysis system for magnetic field effect of cathode-ray tube that is used a monitor, TV and medical appliance. We designed and constructed the large 3-axis square coil (2 m length) system for the generation of 3-component magnetic field using power supply, magnetometer and computer below 0.2 mT range. The coil constant is 30.31 ${\mu}$T, 29.73 ${\mu}$T and 30.51 ${\mu}$T for the X, Y and Z axis square coil respectively. The magnetic field resolution was 0.01 T. The uniformity of magnetic field was measured within 1 ％ in the range of 12 cm.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.39 no.spc1
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• pp.203-213
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• 2006

The spatial patterns of meiobenthic communities in deep-sea sediment were examined. Sediment samples for analyzing of meiobenthic community structure were collected using a remote operated vehicle (ROV), multiple corer TV grab at 20 stations at five sites. In all, 15 meiofauna groups were recorded. Nematodes were the most abundant taxon. Benthic foraminiferans, harpacticoid copepods, polychaetes, and crustacean naupii were also dominant groups at all sites. The total meiofauna density at the study sites varied from 49 to 419 ind./$10cm^2$. The maximum density was recorded at a site located in Challenger Deep in the Mariana trench where simple benthic foraminifera with organic walls flourish. These distinctive taxa seem to be characteristic of the deepest ocean depths. Active hydrothermal sediments contain up to 150 harpacticoid copepods per $10cm^2$ of sediment. In a inactive ridge sediments, devoid of macrofaunal organisms:, the abundance of harpacticoid copepods never exceeded 15 ind./$10cm^2$. Multivariate analysis (multidimensional scaling) revealed significant differences in community structure among the three regions; near an active hydrothermal vent, in the deepest ocean depths and at typical deep-sea bed sites.

• Journal of IKEEE
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• v.22 no.1
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• pp.185-188
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• 2018

This paper describes the parasitic capacitance modeling according to the coil structure, section bobbin and winding method for hybrid choke coil with reduced parasitic capacitance capable of the EMI attenuation of broad bands from lower frequency to higher frequency applied in the EMI attenuation filter of LED-TV SMPS. Especially, the hybrid choke coil with reduced parasitic capacitance($C_p$) proposed in this paper can reduces the parasitic capacitance($C_p$) by adopting the winding methods of rectangular copper wire, compared to the conventional common mode choke coil with the winding method of automatic type. The first resonant frequency of the proposed hybrid choke coil has a tendency to increase as the parasitic capacitance is smaller and its impedance characteristics, especially in the high frequency bands, improves as the first resonant frequency increases. In the future, the proposed hybrid choke coil with reduced parasitic capacitance shows it can be actually utilized in not only LED-TV SMPS but also various applications such as LED Lighting, Note-PC Adapter, and so forth.

• Journal of Sensor Science and Technology
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• v.23 no.3
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• pp.185-191
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• 2014

The width of depletion region in a varactor diode can be modulated by varying a reverse bias voltage. Thus, the preferred characteristics of depletion capacitance can obtained by the change in the width of depletion region so that it can select only the desirable frequencies. In this paper, the TV tuner varactor diode fabricated by hyper-abrupt profile control technique is presented. This diode can be operated within 3.3 V of driving voltage with capability of UHF band tuning. To form the hyperabrupt profile, firstly, p+ high concentration shallow junction with $0.2{\mu}m$ of junction depth and $1E+20ions/cm^3$ of surface concentration was formed using $BF_2$ implantation source. Simulation results optimized important factors such as epitaxial thickness and dose quality, diffusion time of n+ layer. To form steep hyper-abrupt profile, Formed n+ profile implanted the $PH_3$ source at Si(100) n-type epitaxial layer that has resistivity of $1.4{\Omega}cm$ and thickness of $2.4{\mu}m$ using p+ high concentration Shallow junction. Aluminum containing to 1% of Si was used as a electrode metal. Area of electrode was $30,200{\mu}m^2$. The C-V and Q-V electric characteristics were investigated by using impedance Analyzer (HP4291B). By controlling of concentration profile by n+ dosage at p+ high concentration shallow junction, the device with maximum $L_F$ at -1.5 V and 21.5~3.47 pF at 0.3~3.3 V was fabricated. We got the appropriate device in driving voltage 3.3 V having hyper-abrupt junction that profile order (m factor) is about -3/2. The deviation of capacitance by hyper-abrupt junction with C0.3 V of initial capacitance is due to the deviation of thermal process, ion implantation and diffusion. The deviation of initial capacitance at 0.3 V can be reduced by control of thermal process tolerance using RTP on wafer.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.31 no.4
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• pp.362-371
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• 1995

This study describes with the sinking behaviour for the purse seine. The experiment was carried out using three model purse seines of knotless netting. The nettings were woven in same leg length(10.5mm) of polypropylene 170 denier, polyamide 210 denier and polyester 250 denier two thread ply twine, each of the seines were named PP seine, PA seine and PES seine. Dimension of Purse seine models were 420cm for corkline and 85cm for seine depth, each models rigged 65.8g, 50.6g and 35.8g(weight in water) of lead for a leadline, seine models will have the same weight in water. Experiments carried out in the observation channel in a flume tank under still water conditions. Sinking motion was recorded by the one set of TV-camera for VTR, and reading coordinate carried out by the video digitization system. The results obtained were as follows: 1) Netting bundle for PP seine was existence on the surface of the water, spread out a netting by sinking force of sinkers. 2) Netting bundle for PES seine was existence in the middle of corkline and leadline. 3) Average sinking speed of seine margin was fastest for 10.7cm/s of PP seine, followed by 9.7cm/s of PA and 9.2cm/s of PES seines. 4) In all seines, the force of horizontal movement for the seine setting was values of ranged in disregard.

• Korean Journal of Community Nutrition
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• v.12 no.4
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• pp.449-461
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• 2007

This study was conducted to investigate the changes of physical and psychological factors of obese children, obesity indices and blood serum levels, food habits and body and self-esteem after a weight control program. The results from this study were as follows: Participants of the study involved 20 boys (48.8%) and 21 girls (51.2%) totaling 41 children. Children's weight control experiences were 90.2% and parents' were 59.5%. Among methods of weight control, children and parents both used exercise and reduced amounts of meals. Sixty-one percent of the children had breakfast almost everyday. The reasons of skipping breakfast were having no time to eat by 44.4% and 50% of children watched TV while having a meal and they considered taste (55.3%) and nutrition value (21.1%) when choosing food. After the weight control program, the children's body fat percent (%) significantly decreased from 40.3% to 35.4% (p < 0.01). There was significant difference of boys and girls' hip circumferences (92.9 cm, 91.4 cm, p < 0.01) after the program but there was only a slight change in their WHR (0.91, 0.92). Girls' waist circumferences significantly decreased from 75.0 cm to 73.0 cm (p < 0.05) and there was a significant increase in HDL-cholesterol, 50.0 (mg/dL) to 55.2 (mg/dL), (p < 0.05). Knowledge levels of obesity significantly increased from 2.5 to 5.1 in the girls' cases (p < 0.001). Nonetheless, attitudes of weight control and food habits score had not changed a lot. After the program, both the boys and girls' body-esteem had significantly increased (p < 0.01) but self-esteem had not changed. These results suggest that a body weight control program must be included in nutrition education, exercise and psychotherapy to improve body and self-esteem of obese children.

• Journal of the East Asian Society of Dietary Life
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• v.12 no.4
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• pp.299-306
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• 2002

This study was undertaken to compare the obesity related dietary factors among rural middle school students living in the Daegu.Kyungbuk area. Anthropometric data showed that mean height and weight were 162.7$\pm$8.6cm and 53.9$\pm$9.8kg in 220 male students and 158.4$\pm$6.2cm and 51.0$\pm$7.6kg in 210 female student. Mean BMIs for boys and girls were 19.00$\pm$2.35 and 19.30$\pm$2.45, respectively. 71.36% of male students and 71.9% of female students were underweight by the BMI index. Students who skipped the breakfast were up to 66.8%. The reasons for skipping a meal for both sexes were significantly different. Compared to males, more female respondents felt guilty and depressed related to eating. Furthermore, females were more significantly concerned about body image, diet and body weight (p<0.001), and they were not satisfied with their weight. The sources of information on obesity and diet were radio and TV in males, while females gathered information from magazines and friends. The ideal body weight of male students was heavier than the actual body weight while female students desired a thinner body shape. In conclusion, a different approach for nutrition education based on sex should be developed, and implemented fur adolescents.

• The Korean Journal of Food And Nutrition
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• v.19 no.4
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• pp.343-351
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• 2006

This study was conducted to investigate food habits and eating behavior of preschool children. Food habit, eating behavior and health status were investigated by using a questionnaire answered by the mothers of 312 children aged 6 to 7 years old who lived in Uiwang. The average height, weight, Kaup index were 115.08cm, 21.41 kg, 16.13, respectively, for boys 111.37 cm, 19.93 kg, 15.72 for girls. Results showed that 72.16% of subjects skipped the breakfast meal. One of the main reason fur skipping breakfast was 'no appetite'(53.14%). It was found that 49.67% of the subjects belonged to 'good' in health status. The eating behavior of 'watching TV or playing a toy during meal' and 'can eat the rice by oneself were significantly higher score in girls than in boys(p<0.05). Food attention of the parents for the health of children was the highest in 'keep regular meals a day'(92.65%). Health status showed significantly negative correlations with kaup index and eating behavio(p<0.001). Kaup index(p<0.05) and health attention(p<0.001) were positively related with eating behavior. Based on this study, nutritional education program for preschool children would be required for the dietetics teacher to guide the children and more attention should be paid to the nutritional education of food habits in this age group and their mothers.

• Archives of design research
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• v.19 no.5 s.67
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• pp.233-242
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• 2006

The purpose of this study is to investigate communication efficacy of advertisement text through audience responses. This study approached qualitatively to KT&G TV commercials. The research proceeded as follows: First, as background theory, studies on audience focusing advertisement criticism and the interpretation of advertising texts were reviewed. Secondly, the characteristics of the audiences of the advertisements, analyzed through in-depth individual interviews as well as group interviews, were incorporated into a broad theme and then divided into different dimensions. Finally, the audiences' decoding code and critic reponses in reading ambiguous advertising texts, and the interrelationship between strategic ambiguity were discussed under a unified model. The major findings of this study are as follows: In interpreting the ambiguous advertising texts, the audiences use various decoding codes such as language, visuals, technology and rhetoric, and various critic responses such as linguistic, macroscopic, schematic, non-verbal and socio-cultural factors, in quite comprehensive manner. Also, it was shown that audiences make use of different decoding strategies in terms of their recognition, reliability, emotional attitude, and behavior. It can therefore be concluded that the strategic ambiguity has its limit in explaining its effectiveness in the entire dimensions of recognition, emotional attitude, and behavior, in the sense that the strategic ambiguity is most effective in recognition while it invokes more negativity in the behavioral dimension. Finally, this empirical study, focusing on qualitative analyses, may have its limit as well; however, deeper statistic-qualitative studies in the future could compensate for it.