• Radioisotope journal
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• v.16 no.3
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• pp.89-95
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• 2001

방사선방호 및 방사성 폐기물 유출 및 산물에 대한 관리는 새 천년의 공공정책, 종사자교육 및 기술개발에 있어 매우 중요하다. 자유, 지탱능력, 투명성 그리고 기술로부터 오는 이익과 위험에 대한 의사결정에의 대중 참여 등에 대한 가치 남용은 새 천년의 공공 정책 의사결정 체계를 형성하게 될 것이다. 위험의 확인과 평가, 그리고 위험 관리에 대한 의사전달시 초기에 제3자를 개입시키는 것이 유용하다. 특정 환경문제를 더 넓은 공중보건과 생태계의 항목에 포함시키는 것은 모두에게 도움이 될 것이며, 또한 귀중한 자원을 가장 효과적으로 사용하기 위해 더 나은 결정을 도와줄 것이며, 과정과 결과에 대한 대중의 신뢰를 높혀줄 것이다.

• KOREAN POULTRY JOURNAL
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• s.159
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• pp.35-38
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• 1983

농수산부 고시 제82-71(82. 12. 20)로 개정고시한 사료의 공정규격이 금년 1월 20일부터 시행된다 이중 양축가들이 그동안 바라던 배합사료 전 품목에 대하여 제조업체가 자율적으로 자체성분을 결정 등록하게 함으로써 우리나라 사료사에 새로운 장을 열었다. 이는 정부주도형에서 민간주도형으로 제조업체는 물론 양축가를 포함한 모두의 노력으로 축산업을 합리적으로 발전시키려는 정부의 강한 의지의 표현으로 받아들여지고 있다. 그 외 소량광물로 이용하던 Mg, Na, CI, K, S 5종으 단미사료의 필수 광물질원으로 지정하였는데 양축가나 사료업체들이 원하는만큼 만족한 결과는 아니라할지라도 그 속에 담긴 깊은 뜻이 있는 것으로 업계는 받아드리며 가까운 시일 내에 후속조치가 계속 있을 것을 기대하며 기다려 본다. 그토록 바라던 일들이 서서히 해결되어 감에 따라 축산업계의 밝은 앞날을 그려본다.

• 전기의세계
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• v.36 no.5
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• pp.316-325
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• 1987

다각 보행 로보트의 세부 개발 분야로는 다음과 같이 세가지로 나눌 수 있다. (1) 기계적 구조 분야-3축 자유도를 갖는 다리의 구조, 에너지 효율을 고려한 다리의 구조, 역학 및 운동학의 분석, 모델화등 (2) 제어분야-다리의 시퀀스 결정, 각 다리의 서보 제어, 균형 및 안정도 유지, 속도제어 (3) 지능 및 센서 분야-장애물 인식, 경로의 판단, 장애물 통과시 다리의 위치 결정 본고에서는 제어분야와 관련하여 걸음새(gait)의 종류 및 표시방법에 대해서 2장에서 언급하고, 3장에서 1각 및 2각 제어 알고리즘을 통해 역학(dynamics)이 고려된 다리의 시퀀스 제어에 관해서 알아보며, 4각 이상의 다각 로보트에 대한 제어문제 및 제어기법에 대하여 4장에서 기술하였다.

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.27 no.5
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• pp.435-443
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• 1998

물은 인체 조직의 70%를 점유하고 있으며 만일 5%정도의 수분을 상실하게 되면 인간은 혼수상태가 되며, 12%정도를 잃으면 생명을 유지할 수 없다. 따라서 물은 신체의 유지는 물론 인간생활에 있어서 없어서는 안될 중요한 자원으로서 그 사용량과 수질은 문화 생활의 정도를 가늠하는 척도로 여겨져 왔다. 기존의 풍부한 물은 단순히 자유재로 생각되어 왔으나, 최근 들면서 귀중한 자원이며 경제재라는 인식이 확산되고 있으며 물을 수자원이라고 부르는 것이 세계적 추세이다.

• Proceedings of the Korea Information Processing Society Conference
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• 2022.11a
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• pp.105-106
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• 2022

한국은 지리적 특성상 매해 태풍과 호우에 의한 침수 피해를 보고 있다. 또한 기후변화와 도시화 등으로 인하여 피해가 대형화되는 추세이다. 본 논문에서는 자연재해 중 침수피해를 최소화하는 대안으로 공공데이터를 활용하여 관련 정보를 시각화한 프로토타입의 앱을 설계 및 구현한다. 구현한 앱을 통하여 침수 피해를 미리 대비하고 침수 시 피해를 줄이는 효과를 기대할 수 있다.

• Journal of Korean Society of Transportation
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• v.19 no.3
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• pp.7-18
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• 2001

The pedestrian signal systems operating presently could provide more time for the pedestrian to cross the street than the previous system, but it would increase the cycle length and cause longer delays at the signalized intersections. For instance, more than 80% of traffic signals would have to have the cycle length increased by 10sec in Daegu Metropolitan areas. Therefore. the purpose of this study is to propose a pedestrian traffic signal time that not only maintains the safety of the pedestrian but also reduces the traffic cycle length. The proposed pedestrian signal time is set to enable enough time for the elderly to cross and the flashing time is set low enough to deter the ordinary person. This new pedestrian signal time can reduce the traffic cycle length at intersections and prevent the Pedestrian crossing during flashing time. In addition to the flashing green should be changed to flashing red to warn the pedestrian he should not begin crossing as opposed to the flashing green which suggest he could cross. In this study, the speed of 1.1m/sec and 0.85m/sec are applied to the new proposed signal time for normal and elderly person respectively after analyzing data collected at Daegu Metropolitan area.

• Journal of Navigation and Port Research
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• v.40 no.6
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• pp.485-494
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• 2016

The primary purpose of this study is to analyze the impact and determinants of bilateral Free Trade Agreements on international total bulk shipment trade volume at the port of Korea using the Panel Gravity Model. The model estimates the aggregated panel data of exports and imports (excluding transshipment) as a dependent variable during the period from 1996 to 2015. GDP, GDP per capita, distances between bilateral countries, and FTA dummies are included as independent variables. And the economic integration of FTAs including ASEAN+3 and NAFTA3 countries were used as dummy variables. Study results show that GDP and GDP per capita have positive impacts on bulk shipment trade volume at the port of Korea. In addition, Korea's bilateral FTAs with Singapore, India and the United States have positive effects on total bulk trade volume in Korea. This is the so called trade creation effect. On the other hand, ASEAN+3 and NAFTA have negative effects on the total bulk trade. This is the so called trade diversion effect. Also, the distance between Korea and its trade partners has a negative impact. These findings provide insights for: further academic research, site operators who work in related trade and maritime sectors, and policy makers engaged in port and maritime operations. The results can be used to develop strategies for maximizing bulk port throughput.

• Journal of the Korean Society of Groundwater Environment
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• v.6 no.3
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• pp.152-157
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• 1999

Oil leaked from underwound storage tanks and leachate from sanitary landfills have been known as contaminant sources of the high-quality groundwater resources. The mobility of contaminants in the aquifer largely depends on the groundwater flow and the determination of associated hydraulic parameters is essential for a proper remediation of contaminated grnundwater. This study aimed at determining an optimum set of hydraulic parameters for an unconfined sandy aquifer of a laboratory scale through comparison of various methods. Results showed that the specific yield obtained from gravity drainage experiment was an average of 0.20 with minor variations in aquifer depths. and the permeabilities obtained from Dupuit approximation and slug test gave similar values of 5.33 cm/min and 5.85 cm/min but the constant head method gave 0.17 cm/min, which is much ion than the other methods. This experimental evidence reveals that the permeability of the unconfined sandy aquifer could be accurately determined by Dupuit assumption or slug tut rather than by constant head method conducted for a disturbed separate soil column.

• Journal of Radiation Protection and Research
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• v.28 no.1
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• pp.9-18
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• 2003

Rice plants at different seed-developing stages were exposed to HTO vapor in an exposure box for 1 h during daytime and nighttime to investigate the levels of tissue free water $^3H$ (TFWT) and organically bound $^3H$ (OBT) in different plant parts. In the daytime experiment, TFWT concentrations in leaves at the end of exposure $(h_0)$ were around 100% of the 1 hour mean HTO concentrations in air moisture whereas in the nighttime experiment, they were as low as $30{\sim}40%$ of the air concentration. TFWT concentrations in both experiments decreased very rapidly in the beginning but much mote slowly later and those at harvest were hundreds to hundred thousands times lower than those at $h_0$. OBT concentrations varied with time in different manners depending on plant parts and exposure times and differed between at $h_0$ and at harvest by factors of less than 10 on the whole. Even during nighttime exposures, OBT was produced at about a third the rate for daytime exposures. The degree of the conversion of airborne HTO into OBT in mature rice seeds, being several times higher in the daytime experiment than in the nighttime experiment, was highest after the exposure peformed at the most actively seed-developing stage for both experiments. It is estimated that OBT would contribute much more to the ingestion radiation dose than TFWT if rice plants are exposed to HTO vapor for the seed-developing period.

• Journal of the Earthquake Engineering Society of Korea
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• v.10 no.4 s.50
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• pp.15-24
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• 2006

This work reports the results of our study on the dynamic response of various buried pipelines depending on their boundary conditions. We have studied behavior of the buried pipelines both along the axial and the transverse direction. The buried pipelines are modeled as beams on elastic foundation while the seismic wave as a ground displacement in the form of a sinusoidal wave. The natural frequency, its mode, and the effect of parameters have been interpreted in terms of free vibration. In order to investigate the response on the ground wave, the resulting frequency and the mode shape obtained from the free vibration have been utilized to derive the mathematical formula for the forced vibration. The natural frequency varies most significantly by the soil stiffness and the length of the buried pipelines in the case of free vibration. The effects of the propagation direction and velocity and the frequency of ground wave on the dynamic responses of concrete, steel, and FRP pipes have been analyzed and then dynamic responses depending on the type of pipes have been compared. Through performing dynamic analyser for various boundary conditions and estimation of the location of maximum strain has been estimated for the type of pipes and boundary conditions.