• 전자공학회논문지 IE
• /
• v.45 no.1
• /
• pp.31-37
• /
• 2008

A Wibro RF down converter of 2.3GHz band is designed and implemented in this paper. The problems that can occur in the receiver LNA(Low Noise Amplifier) to minimize additional purposes. In addition, 2.3GHz band from the 75 MHz downward to minimize the losses in the process, transform and improve efficiency, and achieve stable characteristics can be used to make high frequency characteristics of the device. Wibro repeater uses a TDMA(Time Division Multiplexing Access) method is needed because the RF switch. Production criterion specification, the input voltage from +8 V 1.2A of current consumption, 60dB gain and the noise figure of less than 2.5dB, VSWR(Voltage Standing Wave Ratio) less than 1.5, more than IMD(Inter Modulation Distortion) 60dB satisfied. Environmental conditions ($-20^{\circ}C$ to $70^{\circ}C$) to pass the test of reliability in a long time, that seemed crafted Wibro down converter be applied to the Wibro repeater.

• Journal of Chest Surgery
• /
• v.29 no.9
• /
• pp.971-976
• /
• 1996

From March 1988 to October 1992, 201 CarboMedics cardiac valve prostheses (150 mitral, 50 aortic and 1 tricuspid) were implanted in 166 consecutive patients (mean age 38 years, male/female 66/100) by one surgical team operating on adult cardiac patients at Kyungpook University Hospital. Total follow up represen:toed 6646 patient-months (mean 40mon1hs) and follow up rate was 96%. One hundred and twenty-four patients (74.7 %) were in NYHA functional class 111 or tV preoperatively and 164 patients (98.7 %) were in class I or ll postoperatively. Hospital mortality was 4.2 % and late death was 4.2%. The actuarial survival at 78 months was 89.4%. The linearized incidence of valve related death, prosthetic valve thrombosis, anticoagulant related hemorrhage, non-structural dysfunction and reoperation was 0.72%/pt-yr, 0.18%/pt-yr, 0.18%trapt-yr, 0.18 %/pt-yr and 0. 36%/pt-yr respective y. The 78 month rates of freedom from valve related death, prosthetic valve thrombosis, anticoagulant related hemorrhage, non-structural dysfunction and reoperation were 94.9%, 99.4%, 99.4%, 98.6 % and 97.9 % respectivly. The 78 month rate of freedom from all valve related complications and deaths including hospital mortality was 90.9%. These fact suggest that the CarboMedics cardiac valve has execellent result, low incidence of valve-ie-lated complications and no structural deterioration, and long term follow up study is necessary.

• The Journal of Korean Academy of Prosthodontics
• /
• v.51 no.4
• /
• pp.284-291
• /
• 2013

Purpose: This study compared fracture strength and fracture modes between metal wire reinforcement and glass fiber reinforcement in repaired maxillary complete denture. Materials and methods: In this study, fracture was reproduced on center of maxillary complete dentures and the denture was repaired with auto-polymerizing resin. The experimental groups (n = 10) were subjected to the following condition: without reinforcing material (control group), reinforcing with metal wire (W group), reinforcing with glass fiber pre-impregnated with light-curing resin (SES MESH, INNO Dental Co., Yeoncheon, Korea, G group). The fracture strength and fracture modes of a maxillary complete denture were tested using Instron test machine (Instron Co., Canton, MA, USA) at a 5.0 mm/min crosshead speed. The flexure load was applied to center of denture with a 20 mm diameter ball attachment. When fracture occurred, the fracture mode was classified based on fracture lines. The Kruskal-wallis test and the Mann-whitney U test were performed to identify statistical differences at ${\alpha}=.05$. Results: W group showed the highest value of fracture strength, there was no significant difference (P>.05) between control group and G group. Control group and W group showed anteroposterior fracture mainly, group W showed adhesive fracture of denture base and reinforcing material. Conclusion: In limitation of this study, the glass fiber did not improve the fracture strength of repaired maxillary complete denture, and adhesive failure was occurred along the lines of glass fiber.

• Cartoon and Animation Studies
• /
• s.33
• /
• pp.343-361
• /
• 2013

This paper derives the mutual relationship between film and installation art through specific case studies about the point of the intersection of the two genres. It needs to find the relationship between art painting and photography and the relationship of silent film and the relevance of the work of art in the 1920s. After painting over the installation exploring the relationship of art and through the mise en scene of the film, ie, the screen image of the configuration and deployment, or cinematic work of art for the film can be found in the application of practices. First, in Chapter 2, this study works of art practices through the analysis of film and the interaction between the two genres based practices for secure sex. In Chapter 3 the movie 'Wonderful Life' and installation art work "hand memory" through the analysis of the two cases specifically for the point of intersection analysis. 'Wonderful Life' and 'hand' Remember each subject and conceptual work in terms of 'memory' that it is represented on similar, but, film and installation art genre caused by the difference in the way the media represented by the results of the different forms of otherwise appear. If so, this study film and installation art practices through the comparison of cases to derive mutual relationship by analyzing two cases in detail what each of the different looks at whether any similarity in that.

• The Korean Journal of Elementary Counseling
• /
• v.10 no.2
• /
• pp.151-165
• /
• 2011

This study aims to demonstrate how well SCM analysis, which indicates social cognitive map of categorizing peer subgroups of elementary school students, corresponds with that of teachers. To do this, the subject of this study includes two classes of the 3rd and the 5th grade students in D elementary school in B-gu, Busan city. Over 30 students of each gender in each grade were surveyed with social network questionnaires to collect data. The result of the social network survey was analyzed by SCM 4.0 program to categorize peer subgroups within each class. The categorized peer subgroups were reported to the class teacher. Based on the report, the class teachers observed peer subgroups in classes. After the teachers observed and categorized the students into several peer groups, an analysis was conducted to compare the peer subgrouping by students with that by teachers. The result showed the two were 80% correspondent to each other regardless of gender and grade. If interobserver reliability stays within the range of 80-100%, it is considered reliable. And this leads to the conclusion that peer subgrouping by students' cognition and that by teachers' observation can be regarded quite corresponding. In conclusion, peer subgrouping through SCM is significant when peer subgrouping Korean children, and it appears to be more significant when analyzed considering different variables including gender and grade. Peer subgrouping by girls is shown to be more accurate than that by boys.

• The Korean Journal of Elementary Counseling
• /
• v.11 no.2
• /
• pp.153-169
• /
• 2012

The purpose of this study is to investigate the most rational method of grouping peers to understand the impact of peer relationship on individual development of elementary school students. For the study, students at a class of the 3rd year(male) and a class of the 4th(female) year at elementary schools in Busan and Ulsan were surveyed to see the differences between various methods of classification of peer relation subgroup on the basis of cooccurence of perception data and psychological preference data. Two questionnaires were used; a questionnaire of perception and a questionnaire of psychological preference. With the perception data, value of sharing relationship was applied to classify peer relation subgroup and with the psychological preference data, interest relationship was expanded to classify peer relation subgroup of more than third party relationship. The result of this study showed that in the case of girls, there was high congruency between the classifications of peer relation subgroup by perception data and by preference data, whereas in the case of boys, there was difference between the classifications of peer relation subgroup by perception data and by preference data, which implies that boys can form a peer group even if there is psychological difference among members but girls can form a peer group only when there is psychological preference among them. Such a result shows that there is difference between boys and girls in the process of forming peer relationship. It is suggested that comparison of fitness be made between classification of peer relation subgroup by a homeroom teacher, by perception data and by psychological preference for rational classification of peer relationship among male children.

• Asian-Australasian Journal of Animal Sciences
• /
• v.12 no.4
• /
• pp.565-572
• /
• 1999

Two experiments were conducted to determine the effects of conditioning (conventional vs expander) corn- and sorghum-based diets on production traits for lactating sows and finishing pigs. In Exp. 1, one hundred sixty-eight sows (parity 1-4, PIC line C15) were fed the corn or sorghum grain diets as a meal, standard (steam) conditioned pellets, or expanded pellets to give a $2{\times}3$ factorial arrangement of treatments. Pellet durability index (PDD was similar for the sorghum- vs corn-based diets, but increased when diets were expanded pellets for both corn- and sorghum-based diets. The corn-based meal diet supported 3.3% greater litter weight gain than the sorghum-based meal diet (44.0 kg vs 42.8 kg). However, the advantage for the corn-based diet disappeared with expander processing (ie., sows fed the sorghum-based diet responded more to diets processed with the alternative processing technology). Sow weight change during lactation was similar (p>0.15) among treatments, although average daily feed intake tended to be greater (p<0.09) for the sows fed sorghum. For Exp. 2, a total of 71 barrows (average initial weight of 58.0 kg) were used in a growth assay to determine the effects of feeding com- and sorghum-based diets, as meal or pellets, after processing with a conventional steam conditioner or an expander (high-shear) conditioner. PDI was not different for the sorghum- vs corn-based diets, but increased from 84 to 95% with expander conditioning compared to conventional steam conditioning. Rate and efficiency of gain, and carcass leanness were similar for pigs fed sorghum and corn (p>0.15). Efficiency of gain was greater (p<0.04) for pigs fed the pelleted (356 g/kg) diets compared to those given the meal (348 g/kg) diets. However, efficiencies of gain were similar (p>0.11) for pigs fed the conventional- and expander-conditioned diets. Pelleting increased (p<0.01) the incidence and severity of stomach lesions regardless of grain type. In conclusion, corn-based meal diet resulted in a greater litter weight gain than the sorghum-based meal diet. However, that advantage disappeared when the diets were expanded and pelleted. Finishing pigs fed pelleted diets were more efficient than those fed meal diets.

• Journal of Digital Convergence
• /
• v.11 no.5
• /
• pp.237-243
• /
• 2013

This study aims to examine the modified $A^2/O$ process is useful to reduce the environmental pollution caused by nutrient in wastewater. Specific results are as follows: The removal rate was evaluated at each time period, ie., 18h, 8h, 6h, and 3h after the reaction started. The anoxic rate was more than 94-97% from 18h to 6h but was less than 50% before 6h. Thus, the test of nitrification was done using 6h as the optimal anoxic retention time and the aerobic retention time set at 24h. When the flow change was 1:1, the average ammonia concentration inputted was $30mg/{\ell}$. Returned top nitric acid solution and the concentration of ammonia solution falling into the anoxic reactor was about 50％ of the initial concentration, and the flow change was 1:2, the concentration of ammonia falling into the anoxic reactor was about 62% of that of influxed ammonia. And the results of this study showed that the nitrogen removal rate can be improved by inputting untreated nitric acid and changing the flow of top nitrate solution using the modified $A^2/O$ method.

• Journal of dental hygiene science
• /
• v.7 no.4
• /
• pp.295-302
• /
• 2007

The purpose of this study is to make formulated examination and analysis about major two factors of dental hygienic students' satisfaction at clinical training, i.e. the contents of clinical training and their duties satisfaction, so that it can provide a basic reference material for more efficient clinical training and education. This study conducted a questionnaire survey for 427 students who were taken via simple random sampling from sophomore and junior dental hygienic students, who already experienced in clinical training courses, at some universities(and colleges) in Metropolitan and province areas. The data collected from this survey were analyzed using SPSS WIN 11.5, in parallel with t-test, one-way ANOVA and ${\chi}^2$(Chi-square) test. It was found that our students didn't feel so much satisfied at clinical training(satisfaction level = 3.34). Overall, they didn't show any significant satisfaction with the contents of training and the experiences in clinical training duties. Our dental hygiene students showed relatively low satisfaction with the contents of clinical training as well as satisfaction at clinical training duties, which ie that current clinical training in dental hygienics still remain at the level of simple assistance for dental treatment.

• 전자공학회논문지 IE
• /
• v.43 no.1
• /
• pp.5-15
• /
• 2006

In this paper, we measured the biosignal using hot-water system(STYX ford202) on foot. The biosignal transition data is observed from hot-water thermotherapy on foot. pre and post demonstration conditions under 43$^{\circ}C$ and 45$^{\circ}C$ are checked about 9 physiological factors for 10 persons and 10 days. (Checking Time: pre-test, post-test(5, 10, 15, 20 minutes)). The biosignal transition of demonstration's results showed as belows; Forehead Temperature($^{\circ}C$): -0.69 $\pm$ 0.01 dec, Leg Temperature($^{\circ}C$): 1.51 $\pm$ 0.22 inc, Blood Flow($m\ell/min$): 1.18 $\pm$ 0.50 inc, Blood Pressure(mmHg): (max) -1.49$\pm$ 2.81, (min) -0.06 $\pm$ 0.13 dec, Heart Rate(bpm): 6.97 $\pm$ 0.72 inc, Blood Sugar($mg/d\ell$) : -2.41 $\pm$ 1.55 dec, Oxygen Saturation(%): 1.34 $\pm$ 0.28 inc, Body Fat(%) -1.75 $\pm$ 0.15 dec, Weight(kg): -0.10 $\pm$ 0.04 dec. (dec: decrease, inc: increase)