• Proceedings of the Korea Water Resources Association Conference
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• 2023.05a
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• pp.9-9
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• 2023

하천의 관리 및 활용을 위해서는 하천의 유량, 수심, 유속과 같은 수리량을 측정하고 모니터링하는 것은 매우 중요하다. 이러한 수리량은 측정하는 방법은 직접 측정하는 방법과 구조물을 이용하여 측정하는 방법이 있으며, 직접 측정하는 방법도 지점 유속을 측정하여 도섭법으로 측정하는 방법, 초음파 방식 도플러 유속계를 이용한 횡단 측정방법 및 특정 수심에서 측정한 유속을 이용하여 지표유속법으로 유량을 산정하는 방법 등이 있다. 또한 '수자원의 조사·계획 및 관리에 관한 법률' 제11조제1항에 따르면 수문조사의 방법·기준 및 수문조사 자료의 처리·활용 방법 등은 표준화해야 한다고 명시되어 있다. 정부에서는 WTO의 TBT협정 등 국제규범에 대응하기 위하여 국제표준인 ISO, IEC 등에 부합하는 국가표준운영체계를 유지하기 위하여 여러 분야의 국제 표준에 대한 대응을 수행하고, 국가표준을 관리하고 있다. 그 중 유량측정과 관련된 국가 및 국제 표준은 2018년부터 환경부 국립환경과학원에서 총괄하고, 한국건설기술연구원과 한국수자원공사에서 표준관리를 위한 표준개발협력기관과 국제표준 대응협력을 위한 ISO 국내 간사기관으로 운영되고 있다. 국가표준의 유량분야(TC 113)는 4개의 세부분과위원회(SC)로 구성되어 있고, 하천에서 수행되는 유량, 수심, 유속 측정 및 측정장비의 검정, 강수량 측정기기 등에 대한 39종이 제정되고 관리하고 있다. 한국건설기술연구원에서는 유량분야의 일반사항, 하천에서의 유량측정방법 및 유량측정기기에 관한 표준을 담당하고 있으며, 유량분야의 국제표준의 개발에 관한 과업을 수행하고 있다. 본 발표에서는 한국건설기술연구원에서 관리하는 유량분야 국가표준 및 국제표준의 종류 및 현업에서 수행중인 하천의 유량 측정과 국가표준의 관계에 대하여 설명하고자 한다.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2006.06a
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• pp.255-256
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• 2006

• The Korean Journal of Nuclear Medicine
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• v.36 no.2
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• pp.133-139
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• 2002

Purpose: Scintillation Proximity Assay (SPA) does not require the physical separation of receptor bound form from free form. SPA was applied to the study of interaction of human chorionic gonadotropin (hCG) and $anti-{\alpha}$ hCG in serum. Materials and methods: $Anti-{\alpha}$ hCG was biotinylated for the binding to streptavidin. The assay was based on the simple competitive binding method between $[^{125}I]hCG$ and the hCG in sample serum, with $anti-{\alpha}$ hCG-coated beads. Aliquots of biotinylated $anti-{\alpha}$ hCG were dispensed into scintillation vials containing $100{\mu}{\ell}\;[^125}I]hCG\;and\;200{\mu}{\ell}$ of either a standard concentration of hCG for preparation of standard curve or unknown sample, and incubated for 20 min. at room temperature. Then $20{\mu}{\ell}$ streptavidin-coated beads were added to vials, and finally incubated for 10 min at room temperature. Values for unknown samples were then calculated from the standard curve. Results: Optimal background counts were certificated using varied radioactivity of radionuclides. Appropriate standard curve was obtained from SPA method successively, and the concentration of hCG from unknown serum was determined by standard curve. The result from SPA assay was similar to that of RIA. Conclusion: This observation confirms that SPA method could be useful for clinical diagnosis.

• Journal of the Korean Society of Marine Environment & Safety
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• v.25 no.7
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• pp.827-833
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• 2019

There are several factors to consider for a ship to enter or depart a port safely. It is particularly important to identify the tides in the port to reduce the risk of stranding the ship. Most previous studies have focused on finding and analyzing harmonic constants. However, the research on the analysis and accuracy of harmonic constants in other hydrographic agencies is lacking. In this study, six Korean ports (Incheon, Gunsan, Yeosu, Busan, Ulsan, and Sokcho) were compared to the British and Korean tide tables based on actual information. To find the cause of tidal difference, the tide height, tide time, and form factor were calculated using harmonic constants. The information was then compared with British and Korean data. As a result of the difference in analysis of actual information and tide tables, there was a difference between the actual tide height and time at each port. The cause was found to be the difference in the harmonic constant, tide, and form factor between the UK and Korea. Therefore, this study, the Korean standard port should be added to the British tide table, and harmonic constants, which are the criteria for creating tides, must be constantly updated with the latest information. Additionally, the tide tables produced in each country are more accurate than the tide tables produced in UK.

• Electronics and Telecommunications Trends
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• v.9 no.4
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• pp.113-129
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• 1994

우리나라에서는 전파법 시행령 제56조의 2항과 무선 설비 규격 제4절 및 관련 고시를 통하여 소출력 무선 설비들을 규정하고 있으나 대상 설비 중 극히 일부분만 세부적인 기술 기준이 설정되어 있는 실정이다. 따라서 이러한 소출력 무선기기 상호간의 혼신이나 타 기기와의 간섭으로 인하여 전파 질서의 안정에 위협받을 가능성이 있다. 본 고에서는 이와 같은 문제를 최소화하기 위해 미국의 소출력 무선기기에 대한 제도 및 표준 규격을 조사 조사분석하여 우리나라와 비교함으로써 국내 무선기기 관련 제도의 체계적 정립과 소출력 무선 설비의 형식 검정을 위한 표준 측정법의 정립에 기여하고자 한다.

• Journal of the Korean Society of Marine Environment & Safety
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• v.19 no.5
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• pp.476-482
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• 2013

This study aims to enhance the effectivity of VTS(Vessel Traffic Service) control by investigating the minimum safe distance between vessel and vessel, vessel and land(obstacle) for the vessel's safe navigation within the VTS control area. In addition, to suggest basic data for the safe navigation, this study has done survey and analysis to each VTS center, and individual on the minimum safe distance to VTS operators of each ports of korea. Through ocean voyage by training ship, Singapore and Malacca strait's congested vessel traffic zone's control distance was compared and investigated the difference on safe distance by the different VTS operators. As a result, there was huge difference of minimum safe distance between the VTS operators belong to the same center. Over all, the port with gentle coastline, like donghae, the safe distance was wider than the other port. On the other hand, port with complex coastline and frequent entry and departure of the vessel, like mokpo, the safe distance was the shortest of all. Therefore, development of module suitable to port's natural conditions and traffic volume's necessity is required, for the operators affiliated to the same VTS center control according to formal method. Lastly, the full discussion by the expert group about establishment of standard control procedure in the future should be considered as well.

• Journal of the Korean Chemical Society
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• v.47 no.6
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• pp.559-568
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• 2003

A procedure based on liquid liquid extraction(LLE)-GC/MS has been developed for the simultaneous analysis of antioxidants and insecticides known as endocrine disrupters. The endocrine disrupters investigated in this study are butylated hydroxy anisole(BHA) and butylated hydroxy toluene(BHT), and the insecticides are allethrin and fenvalerate. The limit of detection(LOD) was 0.071~0.159 ng/ml with RSD of 1.41~5.34% for the standard sample. From water reservior of Han river, Geum river, Nakdong river and Sumjin river, these compounds were not detected. For the synthesized sample, the LOD is 0.051~0.132 ng/ml with RSD of 6.39~13.4%.

• Korean Journal of Food Science and Technology
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• v.28 no.4
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• pp.796-799
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• 1996

The antimutagenic properties of twenty-one strains of Bifidobacterium were examined using Salmonella typhimurium TA98 in an in vitro assay system. The mutagens utilized for testing included Trp-P-1 (3-amino-1, 4-dimethyl-$^{5}H-pyrido$ (4, 3-b) indole), benzopyrene, IQ (2-amino -3-methylimidazo [4,5-f] quinoline), and NQO. The lyophilized cells of strain showed inhibitory effect of 64, 38, 29 and 20% in average against Trp-P-1, benzopyrene, NQO and IQ, respectively. There was no marked variation between each strain or growth stage in the degree of antimutagenicity against Trp-P-1, benzopyrene and IQ. Twelve hour grown cells showed higher antimutagenicity against NQO than 5-day grown cells. The results indicate that Bifidobacterium cells had a antimutagenic effect against several well-known mutagens to some degree.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.21 no.5
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• pp.345-356
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• 2009

Tetrapod has been used as the armor blocks of most rubble mound breakwaters constructed in Korea. The Hudson formula has been widely used in the design of breakwater armor blocks in Korea. In the present study, we calculate the load and resistance partial safety factors of the Hudson formula for Tetrapod armors. The partial safety factors were calculated for the typical breakwater cross-sections of 12 trade harbors and 8 coastal harbors in Korea. The mean and standard deviation of them were also calculated. The mean values were compared with the partial safety factors of US Army (2006). The load and resistance factors are slightly smaller and larger, respectively, than the US Army values. However, the overall safety factors obtained by multiplying the load and resistance factors are close to the US Army values. The result of the present study could be used as the basic data to propose authorized partial safety factors in the future.

• Journal of the Korean Geotechnical Society
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• v.24 no.8
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• pp.137-148
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• 2008

In this study, 28 earthquake records with magnitudes from 5.3 to 7.9 are selected for dynamic analysis in order to assess applicability of the earthquakes for domestic seismic design. The assessment is performed using the seismic spectrum analysis of energy and acceleration. Based on results of the analysis, four acceleration time histories, which satisfy the Korean design standard response spectrum, are proposed. From the dynamic analysis using earthquake magnitudes from 6.4 to 7.9, it is found that horizontal displacements corresponding to earthquake magnitudes greater than 7 are two times larger than those with magnitude 6.5. Therefore, it can be stated that use of strong earthquakes, such as Miyagiken-ken-oki earthquake (Ofunato, $M_{JMA}=7.4$) and Tokachi-oki earthquake (Hachinohe, $M_{JMA}=7.9$), for the seismic design in Korea is not applicable, and may prove to be excessively conservative due to overestimated seismic force. From the dynamic analyses using the proposed acceleration time histories, effects of caisson quay wall dimension and the subsoil condition are investigated as well. The simplified design charts to evaluate horizontal displacements of caisson quay wall are also proposed based on earthquake magnitude 6.5 that is appropriate in Korea.