• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2019.06a
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• pp.197-198
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• 2019

최근 국내 재난유형별 사회재난 발생 현황을 살펴보면 다중밀집시설에 대한 대형화재의 발생 비율이 가장 높은 비율을 차지한다. 이는 대규모 재난 발생에 대한 광범위한 재난정보 전달뿐만 아니라 한정된 지역에 재난정보를 전달하는 방안이 필요함을 시사한다. 현재 지역적 재난정보전달이 가능한 방안으로는 긴급재난문자(CBS) 방식이 있으나, 기술적 한계로 기지국 간의 셀을 그룹화하는 클러스터링 방식으로 전달을 하고 있다. 이로 인해 최소 발령 범위는 시 군 구 단위로 한정할 수밖에 없으며, 재난 발생 지역에서 벗어난 영향이 적은 지역까지 발령하는 문제점들이 존재한다. 본 논문에서는 이러한 문제점을 해결하기 위한 방안으로 건물, 구역 등 한정된 지역에 정보전달을 위한 긴급재난문자 표준 기술에 대해 조사하고 적합한 기술에 대해 논하고자 한다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2018.06a
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• pp.221-222
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• 2018

본 논문에서는 공간적 분포 정보를 이용한 3D 포인트 클라우드 압축 기법을 제안한다. 우선, 3D 포인트 클라우드에 대해 팔진 트리 구조를 생성한다. 그리고 잎사귀 노드들에 대해서 해당 복셀의 중심으로부터의 유클리드 거리를 구하고, 이를 통해서 공간적 분포 정보를 구성한다. 이때, 복셀 내 포인트들의 분포를 고려하여, 포인트들이 밀집하여 분포하는 경우 복셀 내 포인트들을 하나의 대표 위치로 표현하여 압축한다. 최종적으로 산술부호화를 수행하여 압축 성능을 높인다. 실험 결과 제안하는 기법이 3D 포인트 클라우드를 효율적으로 압축함을 확인할 수 있다.

• The Journal of Asian Finance, Economics and Business
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• v.9 no.5
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• pp.177-186
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• 2022

This study aimed to measure the impact of societal participation of Saudi banks on customer satisfaction and determine the statistical differences in customer satisfaction according to sex, age, income, education, and work type. Societal participation has economic and environmental dimensions. The study population includes all Saudis in the government, military, and private sectors reaching 3.58 million in 2021. The unit of analysis is Saudi customers of commercial banks. The 12 banks have societal programs. The research tool is a "Questionnaire," It is distributed face-to-face at places of work. The study concludes that economic participation has no impact on customer satisfaction; however, the impact of environmental participation on customer satisfaction is proved. The study shows no statistical differences in customer satisfaction according to mediators (sex, age, income, education, and work type). Despite the environmental participation being the tangible product by Saudi banks in the local market, the study concludes the positive relationship between societal participation and customer satisfaction. The study presents a set of recommendations for enhancing societal participation in the Saudi businesses environment.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• fall
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• pp.5-6
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• 2021

재난문자는 국가가 재난 상황에 대해 국민에게 경보를 전달하여 알림으로써 피해를 예방하거나 경감시키는 대표적인 수단이다. 하지만 재난문자의 기술 규격을 민간 표준으로 제정하여 준수 여부가 휴대전화 제조사나 통신사에 달려있어 서비스에 차이가 발생하는 문제가 있다. 이 연구는 이러한 문제를 해결하기 위해 국내 재난문자의 기술기준 제정 필요성을 제시한다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2021.06a
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• pp.105-108
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• 2021

Generative adversarial networks (GANs) have reached a great result at creating the synthesis image, especially in the face generation task. Unlike other deep learning tasks, the input of GANs is usually the random vector sampled by a probability distribution, which leads to unstable training and unpredictable output. One way to solve those problems is to employ the label condition in both the generator and discriminator. CelebA and FFHQ are the two most famous datasets for face image generation. While CelebA contains attribute annotations for more than 200,000 images, FFHQ does not have attribute annotations. Thus, in this work, we introduce a method to learn the attributes from CelebA then predict both soft and hard labels for FFHQ. The evaluated result from our model achieves 0.7611 points of the metric is the area under the receiver operating characteristic curve.

• Computers and Concrete
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• v.31 no.6
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• pp.485-499
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• 2023

Both damage and unsaturated conditions accelerate the transport of erosive media inside concrete. However, their combined effects have not been fully investigated. A multiscale mortar model using representative volume elements is developed, capturing the number and distribution in each phase. Afterwards, mortar damage microstructure evolution is simulated in the tensile process. Finally, the unsaturated mortar transport is predicted and analysed. The results indicate that damage significantly affects the diffusion process in the early stage, while the transport performance is weakened due to the obstruction of the nontransport phase in the later stage. The higher the saturation and the more connected pores, the faster the diffusion rate of chloride ions. Chloride ions spread around the cracks in a tree-like manner along. The model can very well predict the chloride ion transport performance of unsaturated and damaged mortar.

• Structural Engineering and Mechanics
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• v.90 no.3
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• pp.263-272
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• 2024

This research deals with the study of two-dimensional deformation in transversely isotropic thermoelastic diffusion medium. This investigation integrates the effect of diffusion and thermal effects in transversely isotropic thermoelastic solids under inclined load. Inclined load is taken as linear combination of normal load and tangential load. Laplace and Fourier transformation techniques are employed to transform the physical domain and then transformed solutions are inverted with the aid of numerical inversion techniques. Concentrated and distributed load are considered to exemplify its utility. Graphical representation of variation in displacement, stresses, temperature and concentration distribution with distance is depicted by taking inclination at different angles. Some particular cases are studied.

• Journal of the Korean association of regional geographers
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• v.4 no.2
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• pp.219-234
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• 1998

This study examines spatial characteristics of residential distribution and occupational composition of Korean emmigrants who live in China, United States, and Japan. The data used are The Conditions of Korean Emmigrants published by Ministry of Foreign Affairs in 1995. Analysis method used this data are as follows: 1) to clarify the tendency and spatial distribution of Korean emmigrants in each nation. 2) to grasp the residential distribution of Korean emmigrants in China, United States, and Japan where many Koreans have lived. 3) to analyze the occupational composition and its spatial characteristics of Korean emmigrants. The main findindgs obtained are summarized as follows: Farmer, forester, stock farmer, and fishery occupy over 50% of the employees of Korean emmigrants in China; traders and other employees occupy about three-fourths of the employees of Korean emmigrants in United States; and other employees occupy about 80% of the employees of Korean emmigrants in Japan. Therefore, the ratio of occupational composition of Korean emmigrants was influenced by emmigration motive, level of economic development of emmigration nation, restrictive condition for ethnic minority, and social status before emmigration etc. Specialized occupational composition in region where many Korean emmigrants in each nation lived was that the highest specialized occupation in region including primary city in population scale is trader; the highest specialized occupation in region including secondary city is manufacturing employee, and the highest specialized occupation in region including third city has transitional characteristics of each region including primary and secondary city. And professional occupation such as lawyer, doctor, religionist and educator appeared to the region including primary city. Finally, Korean emmigrants in United States and Japan contributed to the revitalization of inner city areas. And potential ethnic organization can be seen in church, mass media, and enterprise association in United States, but it can be seen in community shopping association in Japan, Because American society is based on Christianity but Japanese society is not.

• Journal of Korean Society of Environmental Engineers
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• v.30 no.5
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• pp.507-516
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• 2008

This research was conducted to elucidate the effect of temperature on the nitrogen removal of municipal wastewater with waste-tire media. The experiments were carried out in laboratory-scale batch reactor and pilot-scale moving bed biofilm reactor filled at a 0.15 filling ratio with waste-tire media, respectively. In batch tests, specific nitrification rate(SNR) with media was 3.4 mg NH$_4^+$-N/g Mixed-Liquor Volatile Suspended Solid(MLVSS)$\cdot$hr, compared with 1.7 mg NH$_4^+$-N/g MLVSS$\cdot$hr without media. In pilot-scale test with media, total nitrogen removal efficiency increased from 53 $\pm$ 8% to 76 $\pm$ 5% as the temperature increased from 9$\sim$10$^{\circ}C$ to 20$\sim$24$^{\circ}C$. At the temperature of 9$\sim$10$^{\circ}C$, 10$\sim$20$^{\circ}C$, and 20$\sim$24$^{\circ}C$, the SNRs were 0.8 $\pm$ 0.5, 3.1 $\pm$ 1.9, and 3.4 $\pm$ 2.1 mg NH$_4^+$-N/g MLVSS$\cdot$hr and the specific denitrification rates(SDNR) were 0.6 $\pm$ 0.2, 1.1 $\pm$ 0.6, 1.4 $\pm$ 0.6 mg NO$_3^-$-N/g MLVSS.hr, respectively. The overall activities of biomass in anaerobic, anoxic, and oxic zones at 20$\sim$24$^{\circ}C$ increased to 22, 20, and 15%, compared with those at 9$\sim$10$^{\circ}C$, respectively. The activity distribution of Nitrosomonas and Nitrobacter also increased with the increase of temperature.

• The Journal of Korean Medicine Ophthalmology and Otolaryngology and Dermatology
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• v.18 no.3
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• pp.84-94
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• 2005

Objective: In order to help clinical approach on OME patient in progress observation and decision on improvement by clinical research results using tympanometry. Methods: Data was collected from 163 ears of 96 patients who were treated in Dept. of Oriental Medical Ophthalmology & Otolaryngology & Dermatology, Kyung-Hee Medical Center from 2001-2-12 to 2005-4-29 for Otitis Media with Effusion(OME). Tympanometry was applied to all patients and the test result was used to evaluate progress and improvement. F/U cases below 3 times were excluded. Results & conclusion: 1. Age and sex distribution was as follows: Mean Age 5.5years old(Standard deviation: 2.1), age distribution 2-61years old, below 10years old 151cases(92.6%) and above 10years old 12cases(7.4%). Male and female ratio was 1.81:1. 2. There were 67people(69.8%) with bilateral affected ear. Unilateral was 29people(30.2%). Affected ear distribution according to sex came out similarly. 3. Affected period distribution was as follows: over 12weeks 71cases(43.6%), under 12weeks 92cases(56.4%). Out of under 12weeks cases, 2-4weeks was 34cases(20.9%), 0-1weeks and 5-8weeks 20cases(12.3%), 9-12weeks 18cases(11.0%). There was evident difference about affected period between male and female. 4. All patients who served previous Tx in medical clinic(118 cases) took antibiotics. Only 6cases took tube insertion. The period of Taking antibiotics was as fellows: over 6weeks 42cases(35.6%), under 5weeks 37cases(31.4%). unknown 25cases(21.2%), jntermittent 14cases(11.9%). 5. In Period of Tx distribution, 5-6weeks showed 40cases(24.5%) which was highest number. In Improved cases(85cases), 3-4weeks and 5-6weeks each 22cases(25.9%) which was highest number. 1-2weeks 3cases(3.5%), 7-8weeks 12cases(14.1%), 9-10weeks 9cases(10.6%), 11-12weeks 10cases(11.8%), over 12weeks 7cases(8.2%). 6. The cases which have gastrointestinal Sx were 71cases(43.6%), the others 92cases(56.4%). Details of gastrointestinal Sx were as follows: Sx associated with appetite 47cases(47.5%), constipation 15cases(15.2%), abdominal pain and diarrhea 14cases(14.1%), frequent vomitting Teases(7.1%), etc 4cases(4.0%). 7. The cases which have accompanying disease were 116case(71.2%), the other 47cases(28.8%). Details a accompanying disease were as follows: sinusitis 57cases(35%), rhinitis 55cases(3.7%), allergic rhinitis 20cases(12.3%), atopic dermatitis 19cases(1.7%), urticaria 4cases(2.5%), asthma 3cases(1.8%), nasal polyp and conjunctivitis 2cases(1.2%) each, laryngitis 1case(0.6%).