• Journal of Advanced Navigation Technology
• /
• v.16 no.5
• /
• pp.801-809
• /
• 2012

Dispersion management (DM) is the typical technique compensating for the distorted signals due to interaction of group velocity dispersion (GVD) and optical nonlinear effects for transmitting wavelength division multiplexed (WDM) channel with the excellent performance. Optimal net residual dispersion (NRD) and effective launching power range of optical transmission links with random distribution and artificial distribution of single mode fiber (SMF) length and residual dispersion per span (RDPS) required to flexibly design of optical links in DM. It is confirmed that optimal net residual dispersion (NRD) are +10 ps/nm and -10 ps/nm controlled by precompensation and postcompensation, respectively, in both of the considered distribution patterns of SMF length and RDPS. And, in optimal NRD, system performance in optical links with the descending distribution of SMF length and the ascending distribution of RDPS among the artificial distribution patterns are more improved, consequently, effective launching power range is expanded by almost 2 dB than those in optical links with the uniform distribution.

• Asian-Australasian Journal of Animal Sciences
• /
• v.5 no.2
• /
• pp.275-278
• /
• 1992

One hundred sixty three (163) animals were used in $2{\times}2$ and $3{\times}2$ factorial experiment in randomized complete block design (RCBD) to determine the effect of clitoral stimulation during timed inseminations on the fertility of Philippine swamp buffaloes (carabaos). There were 3 separate trials conducted with two treatment groups per trial : control and with 30 second clitoral stimulation after each insemination. Parity, tone of uterus and site of semen deposition were also used as criteria in subdividing the main groups. The pregnancy rates of animals that received clitoral stimulation were significantly (p<0.05 or p<0.01) higher than those of control for both caraheifers (52.98 vs 31.41%) and caracows (52.68 vs 27.07%) ; under all uterine conditions : tone 1 (53.33 vs 31.75%), tone 2 (35.83 vs 22.82%) and tone 3 (75.65 vs 42.44%) ; and in both site of semen placement, cervix (43.99 vs 22.85%) and uterus (60.92% vs 37.81%). Fertility was also significantly (p<0.05) higher when semen was deposited in the uterus (49.37%) than in the cervix (33.42%). Interaction effect was insignificant. Clitoral stimulation should be utilized as a routine procedure following artificial insemination in carabaos.

• Journal of The Korean Association of Information Education
• /
• v.12 no.1
• /
• pp.99-107
• /
• 2008

Over online education based on wired Internet technologies, due to recent development of various mobile technologies, education based on mobile environment becomes popular. In the meanwhile, the young students are more interested in game-based education that provides more interaction and instant feedback than one-way cramming education. The purpose of this thesis is to develop a new motivation model for mobile environment and apply the model to the elementary school students. The proposed model, based on Keller's motivation model, is designed to increase study effects through motivating students with various game strategies. The proposed motivation model has the following characteristics. First of all, the best game genre can be provided for each study theme in early planning stage. Second, the model can allow students to have more interests in their study activity by providing various edutainment elements. Third, a stage of producing game synopsis and concrete scenario is included in motivation model. The stage enables more complete combination of game and mobile motivation strategies. Finally, the proposed model allows contents developed to be appled in teaching plan without any refinement. That is, the model allows a teaching plan to be extracted from study contents instantly.

• Journal of The Korean Association of Information Education
• /
• v.11 no.4
• /
• pp.505-515
• /
• 2007

The purpose of this study is to develop a web based system with six thinking hats techniques for effective debate learning. For this study, first, design strategics of six thinking hats techniques were drawn out in oder to apply the ideas onto the web. second, a prototype was drafted for the model development. Third, a web based debate learning system was developed with six thinking hats techniques concentrated. The developed system was corrected and revised by educational technology experts and teachers with focus group interview, triangulation and member checking methods. This system could be an useful device for 1) activating participants' vigorous interaction, 2) overcoming time and place restriction, 3) especially constructing a progressive debate process with the subject of a real life and 4) designing courses for various and effective debate progress.

• Journal of Korean Academy of Nursing
• /
• v.29 no.6
• /
• pp.1314-1323
• /
• 1999

The purpose of the study was to determine the effects of the 8-week, 15-session group art therapy program on self-esteem and mental health status in chronic schizophrenic inpatients. The sample consisted of two groups of chronic schizophrenic inpatients: 10 patients with an average of total disease duration of 8.90 years who participated in a 8-week group art therapy program, and 8 comparison subjects with an average of total disease duration of 8.25 years who did not participate in the program. A pretest-posttest quasiexperimental design was used to assess self-esteem and mental health status at the beginning and at the end of the 8-week, 15-session group art therapy program. The time points for obtaining data were matched for both groups. The effectiveness of the 8-week group art therapy program was assessed by Rosenberg's Self-esteem Scale(Rosenberg, 1965) and SCL-90- R(Derogatis et al., 1973). SPSSWIN 8.0 was utilized for data entry and analysis employing Mann-Whitney U test. The findings of the study indicated the followings : (a) No significant differences were found between two groups in self-esteem and (b) The experimental group showed significantly lower scores in obsessive-compulsive symptom dimension and interpersonal sensitivity symptom dimension on the SCL-90-R than the comparison group after participating in the group art therapy program. In conclusion, the findings showed the possibility of applying group art therapy as an effective nursing intervention for patients with lack of verbal communication skills and social interaction to improve their interpersonal relationship.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.20 no.8
• /
• pp.1494-1502
• /
• 2016

With the increasing availability of medical sensors and Internet of Things(IoT) devices for personal use, considering the interaction with users, it is planned to add intelligent function design to the fashionable jewelry, and develop composite multi-function intelligent jewelry through sensors identification. By means of IoT technology, while possessing communication function of intelligent jewelry, the function of intelligent jewelry can be expanded to the linkage network. In order to rapidly manage the mass data produced by intelligent jewelry sensors based on IoT, an intelligent jewelry system for health management is designed and an ontology model of intelligent jewelry system based on IoT is worked out. After the state of the services through the smart phone application is shown. The application provides a personalized service to the user and to determine the risk to show the guide lines according to the disease.

• Journal of the Korean Society for Aeronautical & Space Sciences
• /
• v.35 no.11
• /
• pp.964-972
• /
• 2007

Wind turbine experiment was carried out for the horizontal axis wind turbine with the aerodynamically optimized blade. From the comparison of aerodynamic performance between upwind and downwind type wind turbine rotor, the measured torque fluctuation of the latter is larger than that of the former. This phenomenon is owing to the interaction of wake generated from support column and blades. The wind turbine model satisfies the design condition in that the measured result of the power coefficient at zero pitch angle shows maximum peak at the designed tip speed ratio, λ = 6. It also shows that the decrease in aerodynamic power due to negative pitch change is more sensitive than that of the same positive pitch change.

• Journal of Broadcast Engineering
• /
• v.21 no.5
• /
• pp.651-661
• /
• 2016

최근의 디지털 사이니지는 대형 고해상도 디스플레이를 이용해 사용자에게 초고해상도 파노라마형태의 볼거리를 제공하거나 사용자와 인터렉션 등을 통해 맞춤형광고를 제공하는 등 다양한 형태로 발전하고 있다. 또 개방형 디지털 사이니지의 발전과 함께 대형 멀티 사이니지를 이용한 초고화질 영상콘텐츠를 다양한 서비스 단말장치의 연동과 웹기반의 상호운용성을 갖춘 관리시스템이 활발히 연구될 것으로 보인다. 본 논문에서는 수십대에서 백여대 이상의 고해상도 디스플레이를 연동하여 초고해상도 영상표출의 기술의 구현방안과 정형화된 영상 해상도가 아닌 초고화질 영상의 개별 콘텐츠에 대한 동기화 시키는 기술을 이용하여 멀티 콘텐츠 플레이 단말기에서 고해상도 영상을 Play Sync하는 기술을 연구한다.

• Journal of the Korea Institute of Building Construction
• /
• v.18 no.5
• /
• pp.471-477
• /
• 2018

The purpose of this study is to develop an mobile augmented reality for students to learn bar placing work, which is increasingly utilized in the construction field. In order to improve the understanding of the structural drawing, a structural drawing is used as a marker image, and an augmented reality is realized by superimposing a virtual 3D bar placing model that is placed according to the structural drawing on the screen. In addition to the 3D modeling, the contents are developed so as to help students to learn the interpretation method of 2D drawings, the development and splices of reinforcing steel, bar fabricating practice according to KCI structural concrete design code, and the process of bar placing. The results show that the augmented reality is positively evaluated in terms of interface style, perceived usefulness, perceived ease of use, perceived enjoyment, attitude toward using, and intention to use. The augmented reality is worth to be introduced because it has advantages of visualization and interaction in terms of education.

• KSBB Journal
• /
• v.21 no.4
• /
• pp.273-278
• /
• 2006

The noble method of hybrid agarose gel microstamp fabricated by replica molding against PDMS master to make bacteria patterns on agar surface was presented. After the fabricated hybrid agarose gel microstamp was inked with E. coli, we could obtain 2 dimensional bacterial arrays with $50{\mu}m$ circular spots. And the various shaped patterns based on experimental design were easily generated. The analysis of mean fluorescent signal was showed that bacterial pattern have high contrast between spots and background and homogeneity of pattern. Our proposed method solved the problem of wetting and handling with small soft agarose gel microstamp when bacteria were used for ink. The agarose gel stamp provides appropriate environment to inked bacteria, which is essential technology for cell patterning with high retaining viability during the patterning process. This method is reproducible, convenient, rapid, and could be applied to screening system, study of cell-surface interaction, and microbial ecology.