• Journal of the Institute of Convergence Signal Processing
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• v.21 no.2
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• pp.73-78
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• 2020

Musculoskeletal disease is often caused by sitting down for long period's time or by bad posture habits. In order to prevent musculoskeletal disease in daily life, it is the most important to correct the bad sitting posture to the right one through real-time monitoring. In this study, to detect the sitting information of user's without any constraints, we propose posture measurement system based on multi-channel pressure sensor and CNN model for classifying sitting posture types. The proposed CNN model can analyze 5 types of sitting postures based on sitting posture information. For the performance assessment of posture classification CNN model through field test, the accuracy, recall, precision, and F1 of the classification results were checked with 10 subjects. As the experiment results, 99.84% of accuracy, 99.6% of recall, 99.6% of precision, and 99.6% of F1 were verified.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.13 no.6
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• pp.2859-2872
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• 2019

Interference alignment (IA) has been a powerful approach to achieve the maximum degree of freedom (DoF) for K users multiple-input-multiple-output (MIMO) interference channels. However, due to the feasibility constraint, aligning all the interference signals at each receiver is impractical for large K without symbol extension. In this paper, we propose two best-effort interference alignment (BEIA) schemes that the network selects the maximum number of interfering transmitters to align their signals given the feasibility conditions when each transmitter-receiver pair has a constant number of data streams. Besides, in case of not all interfering signals aligned at each receiver, an upper bound of the average throughput is derived. Simulation results show that the proposed schemes have superiority over the traditional methods, such as time division multiple access (TDMA) and cluster IA(CIA), in low and moderate signal-to-noise ratio (SNR) region in terms of average user throughput. In addition, the proposed max-min relative interference distance alignment scheme outperforms the proposed scheme of equal interfering transmitters number alignment in terms of both average user throughput and minimum user throughput.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2022.06a
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• pp.1241-1244
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• 2022

최근 K-Pop 을 위시한 예술공연 콘텐츠에 몰입형 미디어를 접목한 온택트 (Ontact) 미디어 스트리밍 서비스가 주목받고 있는 가운데, 본 논문은 일반적으로 사용되는 2D 디스플레이 또는 HMD (Head-Mounted Display) 기반 VR (Virtual Reality, VR) 서비스에서 탈피하여, 대형 가상현실 공연장을 위한 360 도 VR 비디오 스트리밍 시스템을 제안한다. 제안된 시스템은 Phase 1, 2, 3 의 연구개발 단계를 밟아 6DoF (Degrees of Freedom) 시점 자유도를 지원하는 360 도 VR 비디오 스트리밍 시스템을 개발하는 것을 최종목표로 하고 있으며, 현재는 Phase 1: 대형 가상현실 공연장을 위한 3DoF 360 도 VR 비디오 스트리밍 시스템 프로토타입의 개발까지 완료되었다. 구현된 스트리밍 시스템 프로토타입은 서브픽처 기반 Viewport-dependent 스트리밍 기술이 적용되어 있으며, 기존 방식과 비교하였을 때 약 80%의 비트율 감소, 약 543%의 영상 디코딩 속도 향상을 확인하였다. 또한, 단순 구현 및 성능평가에서 그치지 않고, 실제 미국 UCSB 에 위치한 대형 가상현실 공연장 AlloSphere 에서의 시범방송을 수행하여, 향후 Phase 2, 3 연구단계를 위한 연구적 기반을 마련하였다.

• Journal of Life Science
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• v.14 no.3
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• pp.459-466
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• 2004

The purpose of the precent investigation was to investigate diversity patterns in a fragmented Young-do forested landscape. It was conducted on sloping 18 plots (twelve 50$\times$50 m plots and six 10$\times$100 m plots). Total 1562 individuals were identified and measured in the 50$\times$50 m plots. These were a total of 68 species of 23 families present in the three sites. Least significant differences (LSD) by post hoc analysis revealed that fragments site A had significantly greater densities than site B. Shannon-Wiener functions differed significantly among forests (F=4.12, p＜0.05), with site A forest having significantly higher value (3.401) than the others (2.590 for site B and 2.648 for site C). Pinus thunbergii and Quercus aliena were dominant on most sites. site. The Pinus densiflora forest of sites A and C is distributed better in the NE exposures compared with the opposite ones. Ficus erecta and Pinus densiflora largely occupied the southern exposures. The spatial distribution in southern Young-do's littoral forest was very heterogeneous, reflected by most species having low densities and patchy distributions.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.54 no.4
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• pp.296-305
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• 2018

Maturity and spawning of the pointhead flounder, Hippoglossoides pinetorum were investigated on the basis of samples collected in the coastal waters off Gangwon-do, East Sea from January 2012 to December 2013. The average total length of H. pinetorum was 25.0 cm and 21.9 cm for females and males, respectively. The spawning period was from May to July according to monthly changes gonadosomatic index (GSI) and maturity stages. The spawning period in Gangwon-do was delayed relatively to that in Gyeongbuk-do. The mature egg diameter ranged between $300-700{\mu}m$. The relationship between TL and fecundity (F) was F = 63.574 TL - 1471.3 ($R^2=0.7603$), that is, the larger total length, the more fecundity H. pinetorum had. We estimated that the TLs at 50% group maturity were 25.6 cm for females and 19.9 cm for males. The spawning ecology by sea area should be considered efficient resource management for H. pinetorum. Furthermore, it is necessary to study more on the relationships among growth, maturity and water temperature variations in the East Sea.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.6
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• pp.3982-3990
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• 2015

The purpose of this study is to explore degree of childcare teacher's teacher efficacy and the factors influencing of self-esteem and job stress on teacher efficacy of those surveyed. A total of 280 childcare teacher in G do were surveyed. All of this data is analyzed by using t-test, ANOVA, Pearson's correlation coefficients, multiple regression analysis with SPSS WIN/18.0. Teacher Efficacy according to general characteristics of those surveyed revealed significant difference in age, work experience, position, class age, and child parenting experience. Regression analysis showed 11.7% of variance in childcare teacher's teacher efficacy can by experience of dating with self-esteem and job stress. The fallow-up survey about various factors influencing childcare teacher's teacher efficacy is needed and teacher efficacy increasing mediation way are required.

• Korean Journal of Psychosomatic Medicine
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• v.25 no.2
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• pp.101-110
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• 2017

Objectives : This study analyzed psychological aftereffects and made comparisons between victims who were either sexually assaulted or molested using the Minnesota Multiphasic Personality Inventory-2(MMPI-2). Methods : The participants were adult women who visited the Busan Smile Center within 6 months following sexual assault. This study categorized the participants according to types of sexual violence and then identified their social demographic features and characteristics. Student's t-tests were carried out to compare the MMPI-2 results between the sexually assaulted group and sexually molested group. Chi-square tests were also conducted to compare between participants who scored above 65T. Results : Among the 55 participants, 32 were sexually assaulted; 23 were sexually molested. Significant differences between the two groups were found in the following scales: F, F(B), F(P), Pt, Sc, Ma, RC6 and PSYC. Moreover, the number of participants with higher scores in the Pa, Pt, Sc, RC6, and PSYC scales in the sexually assaulted group was significantly higher than in the sexually molested group. Conclusions : Both groups of victims may commonly suffer beyond the moderate level of depression and anxiety in the post-case term. In addition, the sexually assaulted group seems to suffer relatively more from panic and psychological pain than the sexually molested group does.

• Korean Journal of Soil Science and Fertilizer
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• v.16 no.3
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• pp.250-255
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• 1983

Newly manufactured compound fertilizers for chestnut trees developed by Chosun Fertilizer Inc. were tested to evaluate their effectiveness. An experiment was carried out in chestnut farm with 4 years old Eungi Var. from 1981 to 1982. The results obtained are as follows: 1. The growth of chestnut trees was generally good in plots of compound fertilizer contained boron (B C F). 2. The number of ripened strobiles was significantly increased by reducing the ratio of dropped strobiles in plot of B C F. 3. The yield of chestnut by B C F was markedly increased, 6 times more than that of compound fertilizer without boron. 4. Boron content in soil and plant by application of B C F was relatively high, resulting in high production of chestnut. 5. B C F was effective in chestnut orchard to increase nut production markedly.

• Journal of Korean Academy of Nursing
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• v.30 no.2
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• pp.331-341
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• 2000

Since cancer is not easily curable, patients who suffer from cancer may have physical, psychological and spiritual problems for the rest of their lives. Especially when cancer patients do not have much to live for and are placing a burden on their family they will experience more suffering emotionally as much as physically. This study was conducted to provide a basis of data for nursing intervention strategies to minimize a cancer patient`s suffering and to understand the relationship between suffering, burden and the meaning of life in cancer patients. The samples were composed of 160 cancer patients who were inpatients or outpatients of two university hospitals and two general hospitals in Seoul. Data collection were carried out from January, 25, 1999 to February, 26, 1999. The data were analyzed using a SAS program for descriptive statistics, pearson correlations, ANOVA, and Duncan tests. The results were as follows; 1. The scores on the two suffering scale ranged from 132 to 40 with a mean of 87.3(SD 17.5). The mean scores on the burden scale is 28.9(SD 6.9) and the score of the meaning of life ranged from 35 to 51 with a mean of 95.6(SD 18.4). 2. There were significant correlations between the amount of suffering and the magnitude of burden (r=.74, p=.00), the suffering and the meaning of life (r=-.59, p=.00) and the burden and meaning of life (r=-.61, p=.00). 3. In the degree of the suffering, the burden and the meaning of life were two very strong factors, the level of the suffering in cancer patients by age (F=2.64, p=.03) and education level (F=4.16, p=.00). The level of the burden in cancer patients differed by education level (F=4.70, p=.00) and type of cancer (F=2.97, p= .03). Also the level of the meaning of life in cancer patients was different by education level (F=3.55, p=.02). In conclusion, the burden and the meaning of life was identified as important variable that is contributed to reduce the suffering of cancer patients.

• Journal of Advanced Navigation Technology
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• v.17 no.6
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• pp.646-651
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• 2013

In this paper, a small inverted-F antenna with adjustable characteristics is proposed with use of lumped elements, capacitor and resistor. Capacitor is inserted between end of the antenna and ground for size reduction and tuning of resonant frequency. On the other hand, $0{\Omega}$ resistor is replaced as the short line connected to ground. The movement of short point due to use of $0{\Omega}$ resistor results in providing variation of input impedance. Therefore optimum characteristics can be obtained only by proper choice of capacitor and short point without redesign of it's geometry. In order to check the validity, the proposed antenna is designed and fabricated for 2.4 GHz frequency band, and then is applied to a product of Zigbee wireless remote controller. As a result, the size of applied antenna is $8.5{\times}4.5mm^2$ and it is observed that the measured bandwidth and antenna gain are 150 MHz and 2 dBi respectively without redesign of the antenna.