• Korean Chemical Engineering Research
• /
• v.40 no.6
• /
• pp.676-680
• /
• 2002

The specific gravity meter is the instrument used to measure the density of fluids under the reference conditions and it can be widely used in industrial areas, especially in massive flow rate natural gas industry. This study has been carried out in an attempt to improve measurement accuracy of natural gas flow rate calculation, providing the adequate installation and proper operation conditions of specific gravity meter. The test results are 1) the density measurement errors in case of using methane and standard gas as calibration gases are smaller than using methane and nitrogen gas, 2) the periodical calibration to maintain accurate density measurements is essential, and 3) the specific gravity meter is sensitive to changes of environmental conditions, especially environmental temperature surrounding the specific gravity meter.

• Journal of Korean Library and Information Science Society
• /
• v.55 no.1
• /
• pp.1-26
• /
• 2024

The purpose of this study is to derive an integration plan for bibliographic records by applying a duplicate verification algorithm to the item-based catalog in public libraries. To this, G Library, which was opened recently in Busan, was selected. After collecting OPAC data from G Library through web crawling, multipart monographs of Korean Literature (KDC 800) were selected and KERIS duplicate verification algorithm was applied. After two rounds of data correction based on the verification results, the duplicate verification rate increased by a total of 2.74% from 95.53% to 98.27%. Even after data correction, 24 books that were judged to be similar or inconsistent were identified as data from other published editions after receiving separate ISBN such as revised versions or hard copies. Through this, it was confirmed that the duplicate verification rate could be improved through catalog data correction work, and the possibility of using the KERIS duplicate verification algorithm as a tool to convert duplicate item-based records from public libraries into manifestation-based records was confirmed.

• The Korean Journal of Vision Science
• /
• v.20 no.4
• /
• pp.579-588
• /
• 2018

Purpose : To analyze the eyeglasses supply system for ametropic soldiers in ROK military. Methods : We investigated and analyzed the supply system of eyeglasses for the ametropic soldiers provided by the Korean military. The refractive powers and corrected visual acuity were measured for 37 ametropic soldiers who wear insert glasses for ballistic protective and gas-masks supplied by the military based on their habitual prescriptions. Full correction of refractive error was prescribed for subjects having less than 1.0 of distance visual acuity, and comparison was held for inspecting the changes in corrected visual acuity. Suggestions were provided for solving the issues regarding current supplying system, and this study investigated the applicabilities for utilizing professional optometric manpower. Results : The new glasses supplied by army for ametropic soldiers were duplicated from the glasses they worn when entering the army. The spherical equivalent refractive powers of the conventional, ballistic protective and gas-mask insert glasses supplied for 37 ametropic soldiers were $-3.47{\pm}1.69D$, $-3.52{\pm}1.66D$ and $-3.55{\pm}1.63D$, respectively, and the spherical equivalent refractive power of full corrected glasses was $-3.79{\pm}1.66D$, which showed a significant difference(p<0.05). The distant corrected visual acuity measured at high and low contrast(logMAR) of conventional, ballistic protective and gas-mask insert glasses were $0.06{\pm}0.80$, $0.21{\pm}0.82$, $0.15{\pm}0.74$, $0.34{\pm}0.89$, $0.10{\pm}0.70$ and $0.22{\pm}0.27$, respectively, while the corrected visual acuity by full corrected glasses were increased to $0.02{\pm}1.05$, $0.10{\pm}0.07$, $0.09{\pm}0.92$, $0.26{\pm}0.10$, $0.04{\pm}1.00$ and $0.19{\pm}1.00$, respectively. There was a significant difference(p<0.05) except for the case of the low contrast corrected visual acuity of the conventional and gas-mask insert glasses. The procedure for ordering, dispensing, and supplying military glasses consists of 5 steps, and it was found that approximately two weeks or more are required to supply from the initial examination. Conclusion : The procedure of supplying the military glasses showed three issues: 1) a lack of refraction for prescription system, 2) relatively long length of time required for supplying the glasses, 3) an inaccurate power of supplied glasses. In order to solve those issues, in the short term, education is necessarily required for soldiers on the measurement of the refractive powers, and in the near future, further standard procedures for prescription of glasses as well as the securement of optometric manpower are expected.

• Journal of the Society of Disaster Information
• /
• v.16 no.1
• /
• pp.10-20
• /
• 2020

Purpose: Analyze the results of on-site inspection of the tunnel structure maintenance management monitoring and suggest improvement plans. Method: We investigate and analyze the problems of various items on maintenance monitoring of tunnel structure of 14 subway lines of Seoul subway in downtown area. Result: The maintenance monitoring items, measurement quantity and installation location are classified into open tunnel and excavation tunnel and improvement plans are suggested respectively. Various durability criteria of the measuring instruments were examined, and durability confirmation method suggested improvement measures such as approval, inspection, inspection and testing, calibration of monitoring sensors. Conclusion: Applying the improvement measures of the tunnel structure maintenance monitoring to the construction site will increase the efficiency of the maintenance monitoring and contribute to the development of construction monitoring technology.

• Journal of the Society of Disaster Information
• /
• v.15 no.1
• /
• pp.28-38
• /
• 2019

Purpose: The purpose of this study is to contribute to improvement of measurement management level of construction structure and technology development of monitoring sensor by presenting the detailed causes and improvement plans of construction monitoring sensor's decline in durability. Method: The causes and improvement plans of the durability degradation of the construction monitoring sensor were divided into the construction field and the electric, electronic field. The detailed status was reviewed. Results: In the field of construction, approval and inspection, inspection and testing, verification and calibration, and minimization of loss and damage ratio were reviewed. In the field of electric and electronics, sensor package and sealing, disconnection of stress concentration area, damage caused by lightning and corrosion were reviewed. Conclusion: It is expected that the durability of monitoring sensors applied to the construction site will become longer than the present status based on the study that analyzed causes and improvement plans of construction monitoring sensor's decline in durability in the field of construction and electric, electronic devices.

• The Journal of the Korea Contents Association
• /
• v.21 no.9
• /
• pp.632-643
• /
• 2021

The purpose of this study was to examine how the level of self-compassion of correctional workers influenced depression and the simple and double mediating effects of job stress and job autonomy. Although correctional officers experience high levels of stress and depression, there are limited strategies to protect their job performance. The total of 210 correctional workers in S. Korea were included in the final analysis using SPSS PROCESS Macro model 6. For the analysis, Korean Self-Compassion Scale (K-SCS), Korean occupational stress scale (KOSS), and Center for Epidemiological Studies Depression Scale (CESDS) were used. The results of the study were as follows. First, the correlation analysis showed statistically significant relationships between the variables(p<.01). Second, the simple mediating effect of job autonomy was found in the relationship between the self-compassion and depression as well as the double mediating effect of job stress and job autonomy. The influences of low level of self-compassion on mental health (depression) could be modified by improving the level of work related empowerment (job autonomy) as a protective factor. Based on the results of the study, the further study suggestions and limitations were discussed.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
• /
• 1998.06a
• /
• pp.3-7
• /
• 1998

본 연구에서는 광산 인근 토양에서 산성비를 비롯한 침출수에 의한 지하 환경 오염 메카니즘을 검토하고, 오염 방지 및 교정과 대안의 효과를 정량화 하기 위한 방안을 고찰하였다. 이를 위하여 중금속인 비소의 오염도가 높은 토양을 대상으로 인위적 산성용액에 의한 비소의 용출을 실험적으로 검토하였다. 한편, 산성 침출오염수에 의한 지하 환경의 오염을 방지하기 위하여 석회석을 활용한 토양의 안정화방법의 효과를 살펴보았다. 오염된 시료토양에 포함된 비소는 pH 1 이하의 강산성 용액일수록 격렬히 용출되었으며, pH 값이 낮아질 수록 최대 용출량은 증가되는 것으로 나타났다. 석회석에 의한 토양 안정화방안은 매우 효과적이었으며, 석회석에 의한 산성용액의 중화반응 특성식은 미반응 핵 모델중에서 화학반응이 속도지배인 특성식에 잘 부합되는 것으로 보여진다.

• Korean Journal of Cognitive Science
• /
• v.3 no.2
• /
• pp.311-328
• /
• 1992

The level and accuracy of English sentence that is generated by a man or machine translator are determined by the content of the verb dictionary and effective generation algorithm.The conventional English critiques is not adequate for foreigners because they do not have the verb dictionary including verb pattern or the important grammatical constraints. In this paper,Ipropose a structure of verb dictionary and an English sentence critique based on extended verb pattern that is useful to check and correct mistakes of English sentences generated by machine translator.

• Bulletin of the Korean Space Science Society
• /
• 2003.10a
• /
• pp.94-94
• /
• 2003

위성체의 유기오염은 광학계 렌즈 등의 오염 민감 표면에 분자단위로 흡착되어 표면에 층을 이루며 존재하는 것으로 위성의 성능저하 및 임무실패를 야기할 수 있는 주요원인이 된다. 유기오염은 단순히 대기에 노출되는 것만으로도 발생할 수 있으며, 특히 고온 고진공 상태에서는 다른 표면들에서 outgassing된 물질들이 흡착될 수 있기 때문에 그 영향이 극대화 된다. 본 연구에서는 이러한 유기오염을 측정하기 위하여 청정실과 열진공챔버 내에 witness plate를 설치하고 이를 적외선분광장비로 분석하였다. 적외선 분광장비를 이용하여 ESA(European Space Agency) 문서를 기준으로 4가지 물질에 대하여 검교정을 수행하였고, 그 결과를 바탕으로 유기오염물을 정량분석 하였다. 또한 유기오염물질의 분별을 통해 보다 정확한 분석을 수행하기 위하여 GC-MS(Gas Chromatograph - Mass Spectrometer)를 사용하여 분석을 시도하였으며, 이를 국제 기준에 적용하기 위한 방안도 모색하였다.

• Proceedings of the Korea Multimedia Society Conference
• /
• 2002.11b
• /
• pp.89-92
• /
• 2002

CT영상으로 골조직이나 특정 기관의 3차원 모델을 재구성하는 연구는 큰 진전을 이루어 현재는 진료나 치료계획 수립에 없어서는 안될 중요한 역할을 하고 있다. 그러나 기존의 방법으로는 교정이나 시술 시뮬레이션을 위해서는 치조골과 치아를 개별적으로 분리해서 모델링해야하는 치과분야의 요구를 만족시키는 데는 어려움이 있다. 치아와 치조골의 경계를 정확하게 분리하여 개별적으로 조작이 가능한 치아모델을 생성하기 위해서는 슬라스별로 두 영역을 분리할 수 있는 최적의 임계치가 결정되어야 한다. 본 연구에서는 좁은 간격으로 촬영한 연속적인 CT영상 슬라이스들 사이에서 치아들의 형태와 임계값이 점진적으로 변하는 성질을 이용하여 각 슬라스별로 최적의 임계치를 결정하여 치아영역을 분리하는 적응적인 최적 임계화 방안을 제안한다.