• Journal of Korean Society of Water and Wastewater
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• v.32 no.6
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• pp.499-505
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• 2018

We applied column experiments to investigate the environmental fate and transport of silver nanoparticles(AgNPs) in fully saturated conditions of porous media. These column experiments were performed to emphasize oxidation method with $H_2O_2$ concentration and acidic conditions. The mobility of AgNPs was decreased with the increasing ionic strength that the surface charge of AgNPs(zeta potential) was neutralized with the presence of positive ions of $Na^+$. Additionally, it was also affected due to that not only more increased aggregated size of AgNPs and surface charge of quartz sand. The decreased breakthrough curves(BTCs) of bisphenol-A(BPA) and $17{\alpha}$-ethynylestradiol(EE2) were removed approximately 35.3 and 40%. This is due to that endocrine disrupting chemicals(EDCs) were removed with the release of $OH{\cdot}$ radicals by the fenton-like mechanisms from acidic and fenton-like reagent presenting. This results considered that higher input AgNPs with acidic conditions is proved to realistic in-situ oxidation method. Overall, it should be emphasized that a set of column experiments employed with adjusting pH and $H_2O_2$ concentration in proved to be effective method having potential ability of in-situ degradation for removing organic contaminants such as BPA and EE2.

• Quality Improvement in Health Care
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• v.27 no.1
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• pp.58-69
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• 2021

Purpose:In this study, we reviewed existing victim support programs implemented in Korea to aid in the development of psychosocial support programs for patients and guardians who have experienced patient safety incidents. Methods: We reviewed similar programs: a support program for suicide survivors operated by the Korea Psychological Autopsy Center (Korea Foundation for Suicide Prevention), a family harmony program for workers in industrial accidents operated by the National Center for Forest Therapy, and the support services for crime victims provided by the Korean Crime Victims Support Association. We reviewed the contents of each website and conducted interviews with key personnel from each institution. Results: The support program for families who have experienced suicide was developed based on the suicide prevention project at the Central Psychological Autopsy Center. The family harmony program for workers who suffered industrial accidents is operated by the National Center for Forest Therapy at the behest of the Korean Workers' Compensation and Welfare Service. The Korean Crime Victims Support Association was established by the Ministry of Justice in accordance with the Crime Victim Protection Act and provides support to victims of crime. Each program was designed and implemented considering the objectives and goals, defining their recruitment plans as well as the selection criteria for their participants, and creating quality content that adequately addressed the struggles of their participants. Conclusion: The summarization of the various types of victim support programs in this study can be helpful in the future development of psychosocial support programs for victims of patient safety incidents.

• Journal of the Korean Wood Science and Technology
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• v.30 no.4
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• pp.66-73
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• 2002

The chemical compositions of the root bark of Ulmus species and mucilage were investigated. The methanol extractives were fractionated with n-hexane, ethyl ether, ethyl acetate and water and antibacterial activities of each fraction were investigated. Although differences of chemical compositions of the Ulmus species were not noticeable, nitrogen and lignin contents of xylem were higher than those of phloem. However, ash and extractive contents showed adverse results. The mucilage of root bark was slowly gushing out by water and similar to pectin substance with high acidic sugar content. In fractionation experiment, the yield of methanol extraction was about 7% and the portion of water-soluble materials in methanol extractives was 78%. These water- soluble materials had the most high antibacterial activity on Staphylococcus aureus and Salmonella typhimurium.

• The Journal of Korean Society for School & Community Health Education
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• v.23 no.2
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• pp.25-38
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• 2022

목적: 본 연구의 목적은 대사증후군 주의군 대비 대사증후군의 위험요소를 식별하여 예방을 위한 중재방안을 마련하기 위한 것이다. 방법: 한국의료패널 2015년도 데이터를 활용하여 당뇨만 앓고 있는 사람을 주의군으로 당뇨, 고혈압, 이상지질혈증을 모두 앓고 있는 사람을 대사증후군으로 구분하여 추출한 다음 가중치를 부여하여 총 1,559,884명을 대상으로 하였다. 주의군 대비 개인적 특성, 건강생활습관 특성, 삶의 질 특성, 의료이용 특성에 대한 대사증후군의 영향요인을 분석하였다. 결과: 개인적 특성에서는 40대미만 연령대에 비해 연령에 비례하여 대사증후군 위험이 증가하다 70대에 40대미만과 유사한 수준으로 떨어졌다. 남성보다는 여성, 고졸이하보다는 대졸이상, 중소지역에 비해 서울시 거주자, 장애가 없는 군보다는 있는 군, 의료급여가입자보다는 건강보험 가입자, 경제활동을 안하는 군보다는 경제활동 군의 대사증후군 위험이 높았다. 건강생활 습관 특성에서는 비흡연자보다는 흡연자, 술을 안마시는 군보다는 주 2-3회 이상 음주자, 운동을 하는 군보다 안하는 군, BMI가 정상인 군보다는 30 이상인 군에서 대사증후군 위험이 높았다. 삶의 질 특성에서는 일상 활동에 지장이 없는 군보다 있는 군, 통증이나 불편이 없는 군보다 있는 군, 주관적 건강상태가 보통이상보다는 나쁜 군, 섭식문제가 없는 군보다 있었던 군에서 대사증후군 위험이 높았다. 의료이용 특성에서는 미충족 의료이용 경험이 없는 군보다 있었던 군, 약제비가 부담이 안되는 군보다 부담이 되는 군에서 대사증후군 위험이 높았다. 결론: 당뇨를 앓고 있는 그룹 중 본 연구를 통해 확인된 대사증후군 위험 요소가 많은 이들에 대해 우선적으로 대사증후군 예방 보건교육을 집중하는 방안을 제언한다.

• The Korean Journal of Zoology
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• v.23 no.4
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• pp.219-228
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• 1980

The ultrastructures of the granular glands in the asiatic land salamander (Hynobius leechi) skin were observed by means of electron microsope The results were as follows; 1. The granular gland of the asiatic land salamander skin consisted of a body of gland and a duct. The body of the granular gland consisted of the glandular epithelial cells and the myoepithelial cells. The duct of the granular gland consisted of the keratinocytes. 2. The glandular epithelial cells in the asiatic land salamander skin were divided into the dark cell and the light cells in accordance with the electron density of the cytoplasm. 3. The secretory granules of the granular glands were round or oval in form and were divided into the various granules, showing the secretory granules showing weak electron density had the parts showing strong electron density near the granular membrane. 4. It is supposed that showing the different electron densities of the granules in a glandular epithelial cell is due to different mature stages and to different level of water absorption, and the chemical components of the granules showing different electron densities are identical.

• Journal of the Korean GEO-environmental Society
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• v.24 no.11
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• pp.41-49
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• 2023

In this study, we analyzed the settlement characteristics of rockfill embankments mixed with soil by confirming the physical properties of soil materials mixed with silty materials and analyzing the compression characteristics of gravel materials according to the mixing ratio of soil materials. For this, we mixed silty materials into sandy soil to analyze the compression characteristics of soil materials, and we constructed a foundation by mixing various ratios of soil into rockfill materials with a particle distribution similar to that of river gravel, and conducted a one-dimensional compression experiment using a medium-sized chamber. As a result of the experiment, in the case of mixed soil materials, the Transition Fine Content (TFC) appeared in the range of 21~26% depending on the load condition, and in the case of rockfill materials mixed with soil, as the void filling ratio of soil in gravel samples increases, both total compression and creep compression decreases, but after a 50% mixing ratio, the settlement of amount increases again.

• Journal of Digital Contents Society
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• v.15 no.2
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• pp.227-235
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• 2014

The change from people's work-centered values to their leisure-centered values leads into the change in their life styles. In the circumstance, people's participation into sports activities seems to be an important means to improve their quality of life. Along with the change of the times, more people take part in water leisure sports including kayak. As a result, people's needs for various designs of water leisure goods are on the rise. In this sense, it is necessary to come up with strategies to actively respond to such a change. In this paper, we proposed a user decision-making support system for designing kayaks for leisure. Based on the previous studies and literatures and a questionnaire survey with consumers, it chose the sensitivity related to design. By conducting factor analysis and evaluation, it drew sensitivity and proposed kayak design layouts in the aspect of customer sensitivity preference. It is expected that the result of this study will be used not only for kayak design, but as a design guide for the equipment of water leisure sports, and will be applied for user-friendly design.

• The Journal of the Acoustical Society of Korea
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• v.31 no.7
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• pp.427-434
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• 2012

The overlap-add technique based on waveform similarity (WSOLA) method is known to be an efficient high-quality algorithm for time scaling of speech signal. The computational load of WSOLA is concentrated on the repeated normalized cross-correlation (NCC) calculation to evaluate the similarity between two signal waveforms. To reduce the computational complexity of WSOLA, this paper proposes a fast NCC computation method, in which NCC is obtained through pre-calculated sum tables to eliminate redundancy of repeated NCC calculations in the adjacent regions. While the denominator part of NCC has much redundancy irrespective of the time-scale factor, the numerator part of NCC has less redundancy and the amount of redundancy is dependent on both the time-scale factor and optimal shift value, thereby requiring more sophisticated algorithm for fast computation. The simulation results show that the proposed method reduces about 40%, 47% and 52% of the WSOLA execution time for the time-scale compression, 2 and 3 times time-scale expansions, respectively, while maintaining exactly the same speech quality of the conventional WSOLA.

• Journal of Broadcast Engineering
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• v.7 no.2
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• pp.126-135
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• 2002

An image contains various features such as color, shape, texture and location information. When only one of those features is used to retrieve an image, it is difficult to acquire satisfactory retrieval efficiency. Especially, in the database with huge capacity, such phenomenon happens frequently. Therefore, by using moi·e features, efficiency of the contents-based image retrieval (CBIR) system can be improved. This paper proposes a technique to consider location information about specific color as well as color information in image using centroid situation vector. Centroid situation vectors are calculated for specific color of the query image. Then, location similarity is determined through comparing distances between extracted centroid situation vectors of query image and target image in the database. Simulation results show that the proposed method is robust in zoom-in or zoom-out processed images and improves discrimination ability in fliped or rotated images. In addition, the suggested method reduced computational complexity by overlapping information extraction, and that improved the retrieval speed using an efficient index file.

• The Journal of the Korea institute of electronic communication sciences
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• v.9 no.10
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• pp.1125-1130
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• 2014

The quantity and quality of contents containing information are sharply increasing with the rising network speed. In line with this rapid growth of information volume, a new communication protocol using the chaotic signal that can protect contents in communication is proposed as follows. The chaos system has the characteristic of unpredictability due to the sensitive initial values and the similarity of the signals with noise. We configured two chaos systems $F(X_n,Y_n)$ and $G(A_n,B_n)$ that have such characteristics and designed a data communication method using as encryption channel the same chaos signals generated by synchronizing the chaos system G with the F signals. The proposed method was verified with the encryption and decryption of images. The proposed method is different from the existing encrypted communication methods and is expected to lay the foundation for future studies in related areas.is an example of ABSTRACT format.