• The Journal of the Korea Contents Association
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• v.15 no.1
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• pp.331-337
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• 2015

By comparing and evaluating the neutron dose when running cyclotron in fixed type measuring machine and portable type measuring machine, we performed this study to see if there is any difference between the doses in both measuring devices. We performed correction 3 times for the portable type during the experiment. We measured the values 12 times for each correction, so total 36 times by using the fixed type and portable type once every 2 weeks from June 2012 to February 2014. The statistics for the portable type and fixed type for each experiment showed 0.186, 0.511, and 0.057, which are not statistically significant. Therefore, we have come to the conclusion that unless there is deviation based on the correction period of the portable type, correction of fixed type wouldn't be necessary. Also, reduction of social costs may be achieved if we install an alarm meter, which is relatively low priced compared to the high cost neutron measuring machine, when detecting higher level than the interested standard level.

• 대한방사선방어학회:학술대회논문집
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• 2010.04a
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• pp.226-227
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• 2010

• Proceedings of the Korean Society of Disaster Information Conference
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• 2023.11a
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• pp.224-225
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• 2023

방사능재난 시 주민의 방사선 피폭을 최소화하기 위하여 대피 및 소개가 신속하게 이루어져야 한다. 주민이 휴대용 방사선 계측기를 통하여 방사능 오염 발생을 감지해 사전에 신속히 대피할 수 있다면, 방사능재난 대응에 기여할 수 있을 것으로 사료된다. 본 논문에서는 방사능재난 시 주민이 사용하기 용이한 방사선 계측기를 제시하고, 향후 보완하여야 하는 사항에 대해 검토하였다.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2003.05c
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• pp.28-32
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• 2003

본 논문은 시료의 양을 최소화하고 혈중 요소 및 혈당 농도에 대한 정확한 측정을 위하여 최근에 개발된 전기화학형 마이크로 전극형 센서의 간략한 소개 및 전기적인 특성에 관하여 요약하는 것에서 출발하여 센서로부터 전기신호를 발생시키는 signal conditioning 회로의 설계, microprocessor를 이용한 digital 값으로의 변환 및 data 취득, 취득한 data를 측정된 혈당량 및 요소량으로의 변환 저장 display까지의 휴대용 계측기의 prototype 개발에 관하여 기술한다. 이 계측기는 미량의 혈액채취 한번으로 농도를 측정하는 측정모드와, 측정된 data를 찾아보기 위한 검색모드로 작동시킬 수 있다. Microprocessor의 기능을 최대한 사용하여 측정기의 크기를 소형화하였으며 LCD(Liquid crystal display)틀 채택하는 등 저전력 회로로 구현하였다.

• Journal of Korean Society of Steel Construction
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• v.26 no.5
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• pp.375-383
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• 2014

In Seoul, total 166 places of foot-bridges were constructed but a study on correlation between resonance occurrence status by gait vibration and natural frequency by each span and that between span based on structural system and natural frequency is very unsatisfactory in reality. Consequently in this study, time series wave form, power spectrum and natural frequency were analyzed based on resonance occurrence by targeting 65 places of foot-bridges being constructed in Seoul through convenient and simple portable vibration meter.

• Journal of Radiation Protection and Research
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• v.40 no.4
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• pp.211-215
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• 2015

In case of radiation emergencies, radioactive materials released into environments can cause internal exposure of members of the public. Even though whole body counters are widely used for direct measurement of internally deposited radionuclides, those are not likely to be used at the field to rapidly screen internal exposure. In this study, we estimated the counting efficiencies of portable NaI detector for different size BOMAB phantoms using Monte Carlo transport code to apply handheld gamma spectrometers for rapid screening of internal exposure following radiological accidents. As a result of comparison for two counting geometries, counting efficiencies for sitting model were about 1.1 times higher than those for standing model. We found, however, that differences of counting efficiencies according to different size are higher than those according to counting geometry. Therefore, we concluded that when we assess internal exposure of small size people compared to the reference male, the body size should be considered to estimate more accurate radioactivity in the human body because counting efficiencies of 4-year old BOMAB phantom were about 2.4~3.1 times higher than those of reference male BOMAB phantom.

• Electric Engineers Magazine
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• s.382
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• pp.48-49
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• 2014

테스토코리아는 다양한 휴대용 산업용 계측기로 세계적 영성을 얻고 있는 독일 Testo의 한국 자회사이다. 다양한 작업환경에 맞는 편리하고 정확한 첨단 장비 제작과 선진 기술력을 제공하고 앞선 기술과 서비스로 고객만족을 실현하는 등 혁신적으로 우리 산업 환경에 맞는 제품군을 갖추는 하나의 기업으로 비상 중이다.

• Journal of the Korea institute for structural maintenance and inspection
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• v.26 no.1
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• pp.49-57
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• 2022

In order to efficiently analysis the stability of a slope, measuring the shear strength of soil is needed. The Standard Penetration Test (SPT) is not appropriate for a slope inspection due to cost and weights. One of the ways to effectively measure the N-value is the Dynamic Cone Penetration Test (DCPT). This study was performed to develop a minimized multi-function sensors that can easily estimate CPT values and Volumetric Water Content. N value with multi-fuction sensor DCPT showed -2.5 ~ +3.9% error compared with the SPT N value (reference value) in the field tests. Also, the developed multi-fuction sensor system was tested the correlation between the CPT test and the portable tester with indoor test. The test result showed 0.85 R2 value in soil, 0.83 in weathered soil, and 0.98 in mixed soil. As a result of the field test, the multi-function sensor shows the excellent field applicability of the proposed sensor system. After further research, it is expected that the portable multi-function sensor will be useful for general slope inspection.

• Journal of Korean Association for Spatial Structures
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• v.14 no.1
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• pp.61-68
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• 2014

The design of foot-bridge is often influenced by natural frequency. Consequently, vibration frequency becomes important. The empirical expressions used to quantify this parameter at the design phase have not been developed enough to give guideline to Korean foot-bridge. This paper is concerned with the vertical natural frequency of steel foot-bridges. It describes the vibration measurement methods employed for testing structures and presents reliable methods of assessing natural frequency from jumping vibration tests. Data from measurements on 16 structures in Seoul are given. Regression formulas of natural frequency for steel-framed foot-bridges are suggested. Finally, obtained formula are compared with empirical expressions of Seoul City's guideline.

• Proceedings of the KIPE Conference
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• 2007.07a
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• pp.111-113
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• 2007

본 논문에서는 FPGA를 사용하여 진행파형 초음파 모 터의 2상 입력 전원 전압의 주파수, 위상차, 진폭 및 2 상간의 전압차 조절이 가능하고, 8대의 초음파 모터를 동 시에 제어할 수 있는 8채널 USB통신 PC기반 초음파 모터 디지털 제어기를 제안한다. 제안한 제어기는 FPGA를 이용 한 디지털 논리에 의해 출력을 발생하기 때문에 PC로부 터 직접 제어 명령을 입력 받아 각각의 파라미터를 실시 간으로 조절할 수 있을 뿐만 아니라, 둘 이상의 파라미터 를 동시에 조절이 가능하다. 또한, PC와의 인터페이스는 USB통신 방식을 채택하여 제어 명령의 전달속도 향상 및 플러그 앤 플러그 방식을 통해 데스크 탑 컴퓨터는 물론 휴대용 컴퓨터나 PDA와 같은 다양한 플랫폼에서 사용할 수 있도록 설계하였다. 또한, 초음파 모터의 속도 및 위치를 계측하기 위해 사용된 로터리 엔코더 카운터 회로를 FPGA회로에 내장시켜 카운터를 위한 별도의 회로 구성이나 장비 구입의 필요성을 배제하였다. 따라서, 생산 단가 및 부피를 현저히 감소시켰다.