• 한국지하수토양환경학회:학술대회논문집
• /
• 한국지하수토양환경학회 2001년도 추계학술발표회
• /
• pp.184-187
• /
• 2001

This study presents procedure and analysis method for not well known slug interference tests. Results of the slug interference tests were compared with those of pumping and recovery tests and conventional slug tests.

• JSTS:Journal of Semiconductor Technology and Science
• /
• 제15권3호
• /
• pp.397-403
• /
• 2015

This paper presents a new SOC test compression scheme in Embedded Deterministic Test (EDT) compression environment. Compressed test data is brought over the TAM from the tester to the cores in SOC and decompressed in the cores. The proposed scheme allows cores tested at the same time to share some test channels. By sharing free variables in these channels across test cubes of different cores decompressed at the same time, high encoding efficiency is achieved. Moreover, no excess control data is required in this scheme. The ability to reuse excess free variables eliminates the need for high precision in matching the number of test channels with the number of care bits for every core. Experimental results obtained for some SOC designs illustrate effectiveness of the proposed test application scheme.

• Corrosion Science and Technology
• /
• 제17권5호
• /
• pp.211-217
• /
• 2018

Natural degradation of grounding-electrode in soil environment should be monitored for several decades to predict the lifetime of the grounding electrode for efficient application and management. However, long-term studies for such electrodes have many practical limitations. The conventional accelerated corrosion test is unsuitable for such studies because simulated soil corrosion process cannot represent the actual soil environment. A preliminary experiment of accelerated corrosion test was conducted using existing test standards. The accelerated corrosion test that reflects the actual soil environment has been developed to evaluate corrosion performances of grounding-electrodes in a short period. Several test conditions with different chamber temperatures and salt spray were used to imitate actual field conditions based on ASTM B162, ASTM B117, and ISO 14993 standards. Accelerated degradation specimens of copper-bonded electrodes were made by the facile method and their corrosion performances were investigated. Their corrosion rates were calculated to $0.042{\mu}m/day$, $0.316{\mu}m/day$, and $0.11{\mu}m/day$, respectively. These results indicate that accelerated deterioration of grounding materials can be determined in a short period by using cyclic test condition with salt spray temperature of $50^{\circ}C$.

• 전기학회논문지
• /
• 제56권1호
• /
• pp.206-213
• /
• 2007

In this paper, The monitoring system for TV advertisement is implemented using video watermark. The functions of the advertisement monitoring system are monitoring the time, length, and index of the on-air advertisement, saving the log data, and reporting the monitoring result. The performance of the video watermark used in this paper is tested for TV advertisement monitoring. This test includes LAB test and field test. LAB test is done in laboratory environment and field test in actually broadcasting environment. LAB test includes PSNR, distortion measure in image, and the watermark detection rate in the various attack environment such as AD/DA(analog to digital and digital to analog) conversion, noise addition, and MPEG compression. The result of LAB test is good for the TV advertisement monitoring. KOBACO and SBS are participated in the field test. The watermark detection rate is 100% in both the real-time processing and the saved the processing. The average deviation of the watermark detection time is 0.2 second, which is good because the permissible average error is 0.5 second.

• 한국동물위생학회지
• /
• 제30권1호
• /
• pp.155-164
• /
• 2007

This study was conducted to investigate the prevalence of canine heartworm infections, canine brucellosis and hematologic values from 153 free roaming dogs in the area of Gwangju city from March to November 2006. Nineteen (12.4%) of 153 samples tested with modified Knott's technique showed positive reaction for microfilariae. Polymerase chain reaction using specific primers for D immitis amplified the expected product from all samples of 19 microfilaremic canine blood samples as determined by the modified Knott's test for microfilariae. The seasonal infection rates of microfilariae were higher in the spring season (10/19, 52.6%) than in the other seasons. The major hematological findings in microfilaremic dogs were mild leukocytosis and mild monocytosis. A total of 100 dogs randomly selected from 153 free roaming dogs were negative for canine brucellosis by serological test using immunochromatographic antibody test kit.

• 한국정밀공학회지
• /
• 제21권10호
• /
• pp.94-101
• /
• 2004

This paper presents the development of a keypad test system for the improvement of working environment and productivity using PTC 16F877 microprocessor. In order to detect the fault of keypad products, hardware and software design is performed in this system. Keypad fault detection system is controlled by the 8 bit one chip PIC microcontroller for the exactness and speed. Developed panel of the keypad test system is comprised of the sub-panel for selecting in the inspected keypad types and the main panel f3r displaying the working order and fault position. Furthermore, all data from keypad inspection are stored in main memory of personal computer for the database. All these functions lead to the improvement of working speed and environment.

• 대한가정학회지
• /
• 제33권4호
• /
• pp.25-35
• /
• 1995

The objectives of this study were : 1) to investigate the socio-demographic and housing characteristics, 2) to evaluate the present conditions of residential environment, 3) and to analysis the differences of residential environmental evaluation according to the characteristics of low-income families. Questionnaire survey method were used in this study. questionnaire were administrated by 264 household of low-income families in Taejon area. Data were analyzed by SPSS PC computer package. The statistics were frequencies, percentage, t-test, F-test and Ducan's multiple range test. The major findings were as follows; low income families evaluated all of their residential environment at lower, especially the worst of all was the comfortable environment outdoor. there were significant differences in evaluation of residential environment according to the housing characteristics of low income families. The results of this study can be used as basic information for housing p;an and policy for low income families in Taejon area.

• 한국환경과학회지
• /
• 제28권11호
• /
• pp.1033-1040
• /
• 2019

The National Environmental Specimen Bank (NESB) has set up a plan to develop reference materials in the facility for assuring analytical quality and validating analytical methods for its monitoring samples. Some of the crucial characteristics that reference materials must consist of are homogeneity and stability of both intra and inter-bottles. In this study, we examined the homogeneity and stability of cryogenically-milled muscle samples, from Common Carp (Cyprinus carpio) for total mercury. Homogeneity was tested using ANOVA analysis and regression analysis was used to test short-term stability. The variations of total mercury concentration did not significantly differ between the intra and the inter-bottle (F=0.8, p=0.37). Additionally, relative standard deviation of the total mercury concentration showed low values (2.28%). For the short-term stability test, total mercury variations were not statistically significant as demonstrated by the result of the regression analysis (F ratio = 3.11, p = 0.18). This suggests that the cryogenic-milling process has statistically proven the degree of homogeneity and short-term stability for samples of carp muscles in the chemical analysis for total mercury.

• 한국지반공학회:학술대회논문집
• /
• 한국지반공학회 2008년도 춘계 학술발표회 초청강연 및 논문집
• /
• pp.926-931
• /
• 2008

This paper show two different standardized test methods(Japanese Geotechnical Society; JGS 2003). One test is a "Test Method for Frost Heave Prediction Test, JGS 0171-2003", and the other test is a "Test Method for Frost Susceptibility, JGS 0172-2003". The purpose of this test is to obtain the freezing rate(freezing speed), frost heave ratio(heave to sample height), frost heave rate(heaving speed), and other parameters to be used for frost heave prediction and determine the frost susceptibility by freezing test with water intake. This method shall be used to predict the frost heave in frozen ground and evaluate the frost susceptibility of natural and replacement materials.

• 한국항공우주학회지
• /
• 제49권11호
• /
• pp.919-931
• /
• 2021

최근 New Space 시대를 맞이하여 초소형위성이 위성시스템 교육용 도구에서 벗어나 민간 우주 산업체, 정부 기관 및 군정찰 기관에서도 우주 비즈니스 및 실질적인 임무 수행을 위해 활용되는 추세이다. 국내에서도 대학을 중심으로 시작한 초소형위성 개발이 점차 민간 산업체를 비롯하여 다양한 주체들이 시도하고 있다. 하지만 초소형위성의 임무 성공 가능성을 높일 수 있는 우주환경시험의 수행 준비 과정과 시험 결과 그리고 그 과정에서 발생되어 질 수 있는 여러 가지 문제들에 대해 정리되고, 그 경험을 공유할 수 있는 자료를 국내에서 찾기가 쉽지 않다. 본 논문에서는 국내 최초로 개발되고 있는 6U급 초소형위성(SNIPE)의 우주환경시험의 준비부터 시험 수행 과정, 시험 결과 그리고 문제점들을 정리함으로써 나노급 초소형위성(Nanosatellite)을 개발하고자 하는 주체들이 시행착오를 줄이고 임무 성공 가능성을 높이는 데 유용한 참고자료로 활용되기를 기대한다.