• Journal of Korean Home Economics Education Association
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• v.17 no.2
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• pp.145-158
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• 2005

The purposes of this study are to find out the differences of parent-adolescent communication patterns, family cohesion and adaptability according to socio-demographic variables, to estimate the differences of family cohesion and adaptability according to parent-adolescent communication variables and to offer the basic data that are needed to improve desirable parent-adolescent communication, family cohesion and adaptability. Results of these analysis can be summarized as follows. 1. Open communication with father was showed significant difference according to adolescent's birth order. Close communication with father was showed significant difference according to adolescent's sex, adolescent's birth order and family type. Open communication with mother was showed significant difference according to adolescent's sex. Close communication with mother was showed significant difference according to adolescent's sex and birth order. 2. Family cohesion was significantly different adolescent's sex and income level. And family adaptability was significantly different adolescent's set adolescent's birth order and income level. 3. Family cohesion was influenced by open communication with father, open communication with mother, income level and adolescent's sex. And family adaptability was influenced by open communication with father, open communication with mother, close communication with father, income level and adolescent's sex.

• Proceedings of the KIEE Conference
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• 2003.04a
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• pp.244-247
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• 2003

This paper is proposed to position and speed control of interior permanent magnet synchronous motor(IPMSM) drive without mechanical sensor. A minimum order state observer is used for the mechanical state estimation of the motor. The observer was developed based on nonlinear model of IPMSM, that employs a d-q rotating reference frame attached to the rotor. A minimum order state observer is implemented to compute the speed and Position feedback signal. The validity of the proposed sensorless scheme is confirmed by various response characteristics.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.10 no.11
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• pp.5381-5399
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• 2016

Currently, the quantize-and-forward (QF) scheme with high order modulation and quantization has rather high complexity and it is thus impractical, especially in multiple relay cooperative communications. To overcome these deficiencies, an improved low complex QF scheme is proposed by the combination of the low order binary phase shift keying (BPSK) modulation and the 1-bit and 2-bit quantization, respectively. In this scheme, the relay selection is optimized by the best relay position for best bit-error-rate (BER) performance, where the relays are located closely to the destination node. In addition, an optimal power allocation is also suggested on a total power constraint. Finally, the BER and the achievable rate of the low order 1-bit, 2-bit and 3-bit QF schemes are simulated and analyzed. Simulation results indicate that the 3-bit QF scheme has about 1.8~5 dB, 4.5~7.5 dB and 1~2.5 dB performance gains than those of the decode-and-forward (DF), the 1-bit and 2-bit QF schemes, at BER of $10^{-2}$, respectively. For the 2-bit QF, the scheme of the normalized Source-Relay (S-R) distance with 0.9 has about 5dB, 7.5dB, 9dB and 15dB gains than those of the distance with 0.7, 0.5, 0.3 and 0.1, respectively, at BER of $10^{-3}$. In addition, the proposed optimal power allocation saves about 2.5dB much more relay power on an average than that of the fixed power allocation. Therefore, the proposed QF scheme can obtain excellent features, such as good BER performance, low complexity and high power efficiency, which make it much pragmatic in the future cooperative communications.

• International Journal of Internet, Broadcasting and Communication
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• v.12 no.3
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• pp.108-115
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• 2020

Blended learning is a teaching method utilizing all the advantages in 'on and off-line' learning circumstances in order to enhance the learning effect and efficiency, more than the simple use of online factors in the classroom education. In this paper, we present the realization and simulation of algorithm for the realtime evaluation of low-grade and high-grade subjects in order to implement smart e-learning system, considering a lecture intelligibility. In order to grasp the levels of student's intelligibility, we simulated a function that automatically summarizes the study contents of class given by a lecturer. Especially, in administrator mode of smart e-learning system, we suggested and simulated a system in order to help the lecturer to easily manage the student's grades, and we have provided software to tell the student's intelligibility of lecture, analyzed the rate of incorrect answers, automatic judgment of lecture intelligibility and judge the weakest subject.

• International journal of advanced smart convergence
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• v.13 no.2
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• pp.1-6
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• 2024

Reconfiguration and miniaturization of antennas have become key attributes in modern wireless communication systems. Reconfiguration of radiation pattern can alleviate the problems encountered in modern wireless communication systems such as multi-path problems. Physical limitation of miniaturization also can be overcome by using a zeroth-order resonance (ZOR) antenna based on metamaterial. In order to achieve reconfiguration and miniaturization of antennas at the same time, we propose a new pattern reconfigurable zeroth-order resonance (ZOR) antenna that reconfigures the radiation patterns by varying the position and the number of unit cells comprising the antenna. The antenna is fabricated in an equilateral triangular shaped symmetrical structure to increase pattern variety. This structure can easily provide eight different radiation patterns (two omnidirectional and six monopole like patterns).

• Journal of Families and Better Life
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• v.3 no.1
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• pp.77-91
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• 1985

This study was carried out to learn about the contents of communication between mother and her adolescents in this country, and possible differences in the contents of communication with demographic variables. In particular, I wanted to find out the following; 1)contents of communication between mother and her adolescents. 2)Contents of communication between parents with adolescents. 3)Possible differences in the contents of communication with differences in the level of education, employment status, and age of mother, family income level, and sex, and birth order of children. To test these hypotheses, I distributed questionnaires to 600 mothers of selected high school juniors(11th grade) in Seoul. Four hundred and fourty-eight questionnaires were returned, and the results were analyzed using frequency distribution, percentage, and x2-test. The results were as following; 1) In general, mothers communicated well with their adolescents, especially in topics related to studying, friends, school, parents and family, and future career. Communication on sex-education or sex-role, however, was rather limited in contents. ool, parents and family. Communication on sex-education or sex-role of adolescent was almost never attempted. This result showed similarity with 1 above. 3) (1) contents of communication and educational level of mother; contents of communication between mother and her adolescents differed significantly with educational level on all topics except parents and family, indicating that the educational level of mother, the more diverse was contents of communication between mother and her adolescents. (2) Contents of communication and employment status of mother: On all topics except sex-education, communication between mother and her adolescents differed significantly between employed and unemployed mothers, indicating that unemployed mothers communicate on greater number of topics with their adolescents than employed mothers do. (3) contents of communication and family income level; Family income level did not affect contents of communication between mother and her adolescents significantly. (4) contents of communication and age of mother; Age of mother did not affect a contents of communication between mother and her adolescents significantly. (5) contents of communication and sex of adolescent; Thee were significant differences in contents of communication on certain topics; On virginity, sex, marriage, and dating, mother communicate more diversely with daughters than with sons. This result certainly reflects the deep-rooted traditional value system among koreans, with permissive attitude toward males, and far more strict attitude toward females, on sex-related matters. (6) Contents of communication and birth order of adolescents; The birth order of adolescents did not affect contents of communication between mother and her adolescents significantly.

• Journal of the Institute of Electronics and Information Engineers
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• v.54 no.4
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• pp.122-128
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• 2017

In order to simplify the wiring of construction heavy equipment, researches on PLC(Power Line Communication)-CAN(Controller Area Network) communication module are actively proceeding. Even if a PLC-CAN communication module is developed, a simulator capable of judging whether the PLC-CAN communication module is operating normally is needed. In this paper, we designed and developed a simulator that can measure the status of PLC-CAN communication module. We analyzed the characteristics of the power line communication frequency band by analyzing the characteristics of the power line and compared the noise characteristics with the passenger car in order to characterize the heavy equipment noise.

• Korean Journal of Oriental Medicine
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• v.16 no.3
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• pp.127-133
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• 2010

The purpose of this study is to develop the order communication system for Traditional Korean Medicine(TKM) which can support prescribing decisions and provide the toxicological information. The relative vulnerability of the infrastructure of TKM has made us start the study. We carried out the benchmarking for TKM charting solution firstly, and then designed the intelligent search and supporting method for prescription decisions. We developed of the medical herbs database and the web-based order communication program which can be used in medical field actually. This system supplies a various functions to oriental medical doctors such as management for prescription history, search for herb's effects, generating prescriptions, inventory management, alerting of toxicity and taboo, guideline for taking medicine, and so on. The design and implementation process has been described in this research. We expect that this system will play an important role in electronic medical record(EMR) or electronic health record(EHR) binding diagnosis and management functions.

• The KIPS Transactions:PartA
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• v.12A no.2 s.92
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• pp.137-144
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• 2005

Many reliable group communication algorithms were presented to satisfy predetermined message ordering properties in small or medium-scale distributed systems. However, the previous algorithms with their strong reliability properties may be unappropriate for large-scale systems. To address this issue, some epidemic-style group communication algorithms were proposed for considerably improving scalability while guaranteeing the reasonably weaker reliability property than the existing ones. The algorithms are all designed for ensuring the atomic order message delivery property. But, some distributed applications such as multimedia systems and collaborative work, may require only the weaker message ordering property, i.e., causal order delivery. This paper proposes an efficient epidemic-style group communication algorithm ensuring causal order delivery to provide the indigenous scalability of the epidemic-style approach.

• Journal of Korea Multimedia Society
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• v.23 no.2
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• pp.282-292
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• 2020

In order to minimize casualties from marine vessel accidents that occur frequently at home and abroad, it is important to ensure the safety of the passengers aboard the vessel in the event of an accident. There is an EPIRB system as a system for disaster preparedness in the marine situation currently on the market, but there is a problem that the price is very expensive. In order to overcome the cost problem, which is a disadvantage of previous system, LoRaWAN-based communication is used. LoRaWAN communication-based vessel positioning and risk detection system based on LoRaWAN communication transmits measurement data of each module using two Beacon and GPS modules to stably perform position measurement for both indoor and outdoor situations. The rider danger situation detection system can detect the safety status of the rider using the 3-axis acceleration sensor, collect data from the rider positioning system and the rider safety status detection system, and send to server using LoRa communication. When conducting communication experiments in the long-distance maritime situation and actual communication experiments using the implemented system, it was found that the two experiments showed over 90% communication success rate on average.