• Korean journal of communication and information
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• v.37
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• pp.171-203
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• 2007

Since 2003, Korean government went thru biggest and the most significant 'innovation' communicating the government itself as well as its policies. Following Jo's research design conducted in 2003 (published in 2004), this study adopted a longitudinal design to see how Korean government agencies have been changed by the president 'Noh' administration. The concept, 'encroachment' has been utilized to measure professional level of public relations departments of Korean government agencies. 'Encroachment' occurs when a communication department is managed by a person without proper experience or education/training in the field of public relations. After interviewing public relations managers (19 from central agencies, 16 from local government), encroachment has been found to be 'almost not changed' while, opportunities for professional 'on the job' training increased to a certain level.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.13 no.4
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• pp.111-121
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• 1993

Changes in bed forms and subsequent changes in channel roughness by changes in water discharge are discussed with the field data collected from some alluvial rivers in Korea. This study is limited to the following condition of river flow: (1) Medium size alluvial rivers with their widths of 100 m more or less, (2) Straight and prismatic river reach with no additional causes for energy loss but bed friction, (3) Lower-flow regime with Froude number less than 0.5. Major conclusions obtained from this study can be summarized as follows: (1) For the channels considered in this study, the bed roughness expressed by Manning's n increases from 0.02 for the plane beds with no sediment motion to 0.05 for the dune beds, (2) The roughness coefficient for alluvial channels should not be estimated from Strickler-type equations developed for the fixed beds, (3) The method for determining the channel roughness suggested in the present guideline for river works, River Structure Standard, appears to be lack of generality. More research based on the field data collected in Korea is needed in order to improve the existing methods.

• Journal of Conservation Science
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• v.26 no.4
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• pp.417-427
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• 2010

This study is to examine the manufacturing technique based on scientific investigation and analysis on Steel-Plated Jewel Beetle's Adornment gilt-bronze openwork remains excavated from No. 100 site at Hwango-dong Gyeongju. As a result of the investigation on the manufacturing revealed that riveting was adopted to connect gilt-bronze openwork plates and steel plates, followed by mercury amalgam plating method and carving of the patterns by means of the dotted line engraving technique. There were some traces on the surface of Jewel Beetle wings that show the use of pins for fixing, which seems to be the result of recycling or processing. The sectional analysis shows the high possibilities that varnishing with lacquer was adopted for wing adhesion, and it was confirmed that varnishing with lacquer was used on the strap pendant plate to prevent corrosion.

• Journal of the Korea Convergence Society
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• v.11 no.9
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• pp.405-415
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• 2020

This cross-sectional study investigated the relationship among three factors related to patient safety activities: (1) Experiences, (2) Perceptions, and (3) Willingness to Participate. An online survey was administered to 195 people in November 2019. Participants were admitted to a general hospital within the past year. Patient safety activity experience had a significant direct effect on patient safety perception, and patient safety perception had a significant direct effect on willingness to participate. Patient safety perception thus significantly mediates the relationship between patient safety activity experience and willingness to participate. It is necessary to increase patient safety perception through publicity of and educating on patient safety activities performed by hospitals. Doing so may increase willingness to participate in patient safety activities.

• Journal of The Geomorphological Association of Korea
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• v.19 no.4
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• pp.109-122
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• 2012

Topographic changes in the foredune in Sohwang-ri, Boryeong, Chungnam Province was analyzed over the last two years. Seven cross-sections and one permanent plot ($20m{\times}50m$) were periodically studied based on erosion and deposition measurement, in addition to vegetation monitoring and measurement of wind using an automatic weather station. The sand dunes usually grew from late winter to spring and the growth occurred in a period of strong northwesterly winds. From March to April, heavy sedimentation was observed on the front section of the foredune and sand piled up to ca. 30cm to the ca. 25m landward from the high tide line. It is likely that increased wind force and growth of vegetation played a major role in transportation and sedimentation of sand. Meanwhile, the lower part of the sand dunes was eroded when typhoon and spring tide caused a rise in sea level. The transition zone of beach and dune was usually affected by sea water but some frontal slopes were entirely influenced, resulting in dune scarps. The eroded scarps were naturally restored to their original state as time passed.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.24 no.2
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• pp.161-166
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• 2024

The current generation of adolescents stands out as the most digitally interconnected in the annals of history, navigating an era characterized by unprecedented levels of technological connectivity. This study explored the impact of smartphone addiction on the quality of peer relationships among adolescents, with a focus on the mediating role of depression. Analyzing data from 2,288 responses of 14-year-old adolescents extracted from the 2022 cross-sectional data of the Korean Children and Youth Panel Survey 2018, research questions were tested. The findings showed that smartphone addiction among adolescents exacerbates depression, consequently leading to a deterioration in the quality of peer relationships. The results contribute to expanding scholarly understanding of the intersection between digital technology and the mental and social well-being of adolescents. Furthermore, there is a call to action for parents, teachers, counselors, policy maker, and practitioner in education institutions to establish programs that monitor and intervene in cases of excessive smartphone use among adolescents.

• Journal of Dental Rehabilitation and Applied Science
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• v.36 no.1
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• pp.12-20
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• 2020

Purpose: This study was designed to analyze the relationship between the presence and severity of depression and chewing problems (CPs) in a representative sample of the general population. Materials and Methods: Health surveys and examinations were conducted on a nationally representative sample (n = 8150) of Korean was conducted. CPs was determined by a simple survey response concerning "Do you feel uncomfortable about chewing your food because of problems with your mouth such as teeth, dentures and gums?" Depression was defined as individuals with a total score ≥ 10 on the Patient Health Questionnaire (PHQ)-9 survey. Data regarding demographics, socioeconomic history and comorbid health conditions were used to analyze adjusted logistic regression models. Results: In the Korean population, the prevalence of depression was significantly greater in individuals with CP (17.2%) than in those without CP (10.2%). On multivariate logistic regression analysis, the presence of depression was significantly associated with CPs (adjusted odd ratio [aOR]: 1.90, P < 0.001). The risk of CPs increased with increasing severity of depression as follows: severe depression (OR: 2.62, P < 0.001), moderately severe depression (OR: 2.19, P < 0.001). Conclusion: The presence of depression was significantly associated with CPs, especially in severely depressed individuals. Depression screening should be considered in treating CP patients.

• Korean Journal of Construction Engineering and Management
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• v.11 no.3
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• pp.125-133
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• 2010

Although work-efficiency of construction machinery is a critical factor for estimating its workable-quantity perunit time, the efficiency figure table presented in the Poom-Sam that is used for Construction Cost Estimation of public sectors in Korea is very subjective for practical usage. In order to suggest objective work-efficiency table for a Pump-Dredger, domestic and overseas documentary records were investigated and on-going construction sites were also visited. Moreover, actual work quantities collected from the site visits were compared with the ones calculated based on the Standard Measurement Methods used in Japan. The research found that the table can be revised by means of detailing down by several factors, namely project type, depth of soil, undersea-site shape, and condition on the sea for better estimation of its workable-quantity. The research will be the foundation for applying the rapid development of Construction Equipment and technology to the appropriate cost estimations and the ground work of related studies.

• Proceedings of the Korean Vacuum Society Conference
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• 2000.02a
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• pp.89-89
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• 2000

AlN 박막은 Al과 N원자의 부분적 이온결합 특성을 가진 공유결합을 한 육방정계의 wurtzite 경정구조의 화합물 반도체로서, III-V족 반도체 중 가장 큰 에너지 갭(6.2 eV), 결정 구조적 이방성, 화학 양론적 결합구조, 높은 탄성종과 전달속도(약 10$\times$106 m/s)와 높은 열전도도, 고온 안정성, 가시광성.적외선 영역에서의 좋은 투과성과 높은 굴절률, 상온 대기압에서의 유일하게 안정적인 특성을 가지고 있어, 절연재료, 내열재료, 저주파 영역 센서의 압전 트랜스듀서, 광전소자, 탄성파 소자 및 내환경 소자, MIS소자 등으로 주목받고 있다. 본 연구에서는 BAW 공진기의 활용을 목적으로 반응성 마그네트론 스퍼터링 방법으로 AIN 압전박막을 제작하여, 증착 조건-질소 농도, 고주파 출력, 전체 스퍼터링 압력, 기판 온도-에 대한 박막의 특성을 조사하였다. AlN 박막의 c축 우선 방위 결정성 및 낮은 투과성, 적당한 굴절률의 특성이 BAW 공진기의 활용을 위한 요건이므로, 각각의 증착 조건하에 제작된 박막은 XRD의 $\theta$/2$\theta$ 스캔 회절상에 의한 결정성의 분석과 우선 성장 결정면의 rocking curve 및 XRD로 측정한 FWHM과 표준 편차로 결정성의 배열성과 소자 응용가능성을 조사하였다. 박막의 표면.단면 미세 구조 및 평활도는 SEM으로 관찰하였으며, Al-N 결합 상태는 XPS와 FT-IR로 분석 조사하였다. 제작된 AlN 박막의 결정성 분석 결과, c축 우선 방위 성장을 위한 스퍼터링 압력에 대한 임계 질소 농도와 임계 스퍼터링 압력이 관찰되었다. 전체 스퍼터링 압력이 6~8 mTorr의 범위에서 나타난 최소 임계질소 농도는 10%, 최대 임계 질소 농도는 60%이며, 4 m Torr 이하 10 m Torr 이상의 전체 스퍼터링 압력에서 박막의 우선 방위성장이 제재된다. 이는 AlN 박막이 형성에 관여하는 질소 이온 양의 충분한 형성에 필요로 하는 질소 가스의 유입량에 따른 것으로 판단된다. AlN 박막의 c축 결정면인 (002) 결정면의 성장을 유도하며 다른 방향으로의 성장을 제어하여 소자 활용에 유용한 박막을 제작하기 위한 고주파 출력은 300W 정도가 적당하며, 기판을 가열하지 않았을 때 낮은 투과도를 나타낸다. 본 연구에 의한 BAW 공진기 활용을 위한 AlN 압전박막의 제작을 위한 최적 증착 조건은 기판의 가열 없이 6~8 mTorr의 전체 스퍼터링 압력에 20~25%의 질소종도, 300W의 고주파 출력이다. 최적 조건에서의 AlN 박막은 약 0.19$^{\circ}$의 FWHM과 약 0.08$^{\circ}$의 표준편차를 가지며, 균일하고 조밀한 표면 미세구조와 주상정 구조의 측면구조, 파장에 대한 약 2.0의 굴절률, 낮은 투과도와 화학 양론적 구조를 가지는 우수한 박막이 형성되었다.

• Korean Journal of Heritage: History & Science
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• v.47 no.4
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• pp.58-73
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• 2014

In general, it is thought discoloration on wood is frequently found in decorative wood products. So this study was conducted focusing on white rot found lower parts of columns and baseboards of a wooden house, Hyunchungsa (shrine) to know whether microorganisms have any influence on discoloration or there is correlation with strength by investigating resistograph, occurrence of microorganisms and microscopy for analysis(SEM, tissue analysis etc.). The results obtained were as follows: (1) The result of measurement of resistograph showed there are little correlation between discoloration and strength though there was a spot indicating low resistance. (2) The moisture content of discolored part was relatively higher than that of normal parts, but occurrence of microorganisms was less in discolored parts while more kinds of microorganisms were identified in normal parts with high CFU(Colony Forming Unit). (3) The result of SEM (with a magnification of 500 times) on the surface of discolored parts, it was found out there are many kinds of particles in different sizes on the surface and those were composed of elements such as C, O, Si, Ca, and a small amount of Na and Cl (weight %) were detected in part. (4) The result of tissue analysis showed discoloration occurs limitedly to the outer surface of column. As these results, it is concluded that discoloration has nothing to do with strength, damage by microorganisms and salt.