• 한국안전학회지
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• 제37권4호
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• pp.92-100
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• 2022

Of the Korean military's 3,959 ammunition depots, 1,007 - more than 25% - violate safety requirements for distance and equipment. There is a risk of explosion in old depots that are vulnerable to various interior and exterior accidents. This paper examines 10 scenarios, with varying values for ammunition amount and safety distance. The study calculated the overpressure that can be applied to risk-exposure objects, based on the safety distance; expected damage was predicted using constructed spatial information from 3D explosion simulations. The simulations confirmed that explosion overpressure increased the most when the safety distance violation rate increased from 80% to 90%. It also confirmed that secondary damage such as fire and explosion can cause casualties and property damage when the violation rate is 60% or higher. The results show that building collapse becomes a risk with a violation rate of 70% or higher. We conclude that taking ammunition depot safety distance violation into account when planning military facilities and their land utilization could better protect life and property.

• 한국안전학회지
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• 제23권6호
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• pp.164-170
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• 2008

This research was verified detection way of intercept vehicles and performance evaluation after system installation using image detector as detection way of ground installation. By image recognition algorithm was on the trace of moving orbit of violation vehicles for detection way of intercept vehicles. When moving orbit is located special site, utilized geometric image calibration and DC-notch filter. These are cognitive system of license plate by making signal. Then, Bright Evidence Detection and Dark Evidence Detection were applied to after mixing. It is applied to way of Backward tracking for detection way of intercept vehicles. After the field evaluation of developed system, it should be analyzed the more high than recognition rate of minimum standards 80%. It should rise in the estimation of the site applicability is highly from now.

• 한국식품위생안전성학회지
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• 제24권4호
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• pp.338-347
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• 2009

The content of residual pesticides in commercial agricultural products in Gyeongsangbuk-Do area was investigated for 5 years extending the year 2004 through 2008. The detection rates of residual pesticides in agricultural products by year were similar in range of 11.6~16.4%. But the violation rates showed lower values in the last years from 4.5% of the year 2004 to 0% of the year 2007. The highest residual concentration of each pesticide detected in commercial agricultural products was investigated by year. That is, in the year 2004 and 2005, chlorpyrifos, chlorothalonil, diazinon, endosulfan, ethoprophos, fenarimol and procymidone were detected over the tolerance in kale, parsley, celery, chard and lettuce, and in the year 2006, permethrin in the soybean and peanut. The detection rate and violation rate of pesticides were highly increased in the order of the endosulfan, chlorpyrifos, procymidone, chlorfenapyr, fenitrothion, imazalil, isoprothiolane, methidathion and permethrin. The detection rate and violation rate of pesticides were increased after August every year.

• Journal of Korean Neurosurgical Society
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• 제48권1호
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• pp.46-52
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• 2010

Objective : In cervico-thoracic junction (CTJ), the use of strong fixation device such as pedicle screw-rod system is often required. Purpose of this study is to analyze the anatomical features of C7 and T1 pedicles related to screw insertion and to evaluate the safety of pedicle screw insertion at these levels. Methods : Nineteen patients underwent posterior CTJ fixation with C7 and/or T1 included in fixation levels. Seventeen patients had tumorous conditions and two with post-laminectomy kyphosis. The anatomical features were analyzed for C7 and T1 pedicles in 19 patients using computerized tomography (CT). Pedicle screw and rod fixation system was used in 16 patients. Pedicle violation by screws was evaluated with postoperative CT scan. Results : The mean values of the width, height, stable depth, safety angle, transverse angle, and sagittal angle of C7 pedicles were $6.9{\pm}1.34\;mm$, $8.23{\pm}1.18\;mm$, $30.93{\pm}4.65\;mm$, $26.42{\pm}7.91$ degrees, $25.9{\pm}4.83$ degrees, and $10.6{\pm}3.39$ degrees. At T1 pedicles, anatomic parameters were similar to those of C7. The pedicle violation revealed that 64.1% showed grade I violation and 35.9% showed grade II violation, overall. As for C7 pedicle screw insertion, grade I was 61.5% and grade II 38.5%. At T1 level, grade I was 65.0% and grade II 35.0%. There was no significant difference in violation rate between the whole group, C7, and T1 group. Conclusion : C7 pedicles can withstand pedicle screw insertion. C7 pedicle and T1 pedicle are anatomically very similar. With the use of adequate fluoroscopic oblique view, pedicle screw can be safely inserted at C7 and T1 levels.

• 한국산업보건학회지
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• 제33권1호
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• pp.60-69
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• 2023

Objectives: Business operators handling hazardous chemicals regulated under the Chemical Substances Control Act (CSCA) must receive permits to operate their business from the Ministry of Environment. This study analyzed the status of recent legal violation in chemical handling workplaces in Ulsan where a large volume of chemicals is handled for industrial use. Methods: A total of 557 corporations have been granted legal status as business operators in Ulsan. For all business operators, legal violations in regard to the CSCA that were discovered by the environmental office in the last five years (2018~2022) were thoroughly analyzed. Results: A total of 225 violations of the CSCA have been discovered at 165 corporations, with the violation rate accounting for approximately 27% of all business operators. In particular, 22% of the 165 violators (36 corporations) were discovered to have violated twice or more, and some business operators (6%) even violated in consecutive years. Non-compliance of facility inspection was the most frequent violation (45 cases, 20.1%), followed by non-reporting of important changes in the permitted matters (23 cases, 10.3%), non-completion of legal safety education (19 cases, 8.5%), failure to secure permission for modification in the permitted matters (18 cases, 8.0%), and failure to submit chemical transport plans (16 cases, 7.1%). Conclusions: Most of the violations could have been prevented if the field personnel had paid sufficient attention. Thus, it is fundamentally necessary to create an environment for spontaneous safety management for themselves and to strengthen individual capabilities.

• 한국ITS학회 논문지
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• 제10권6호
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• pp.32-39
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• 2011

꼬리물기는 교차로에 정체가 발생하면 녹색 현시라도 진입해서는 안 되는데 이를 무시하고 무리하게 진입, 신호가 바뀐 뒤 다른 방향의 차량흐름에 방해를 주는 행위이다. 인력에 의한 단속 방법은 한계가 있어 지속적으로 단속을 하기위해서는 대체 방안이 필요하다고 하겠다. 교차로에서의 꼬리물기 위반를 시스템을 통해 단속가능한 지 여부를 파악하기 위해 실제 현장에서 실험을 통해 평가를 수행하였다. 본 연구에서는 현재 운영 중인 신호위반 단속장비와 달리 위반 차량을 단속하는 시점을 교차로 진출부 횡단보도 부근에서 하였으며, 위반 차량을 역추적 방식으로 궤적을 추적하는 방식을 적용하였다. 현장 실험 결과 시스템에 다음과 같은 결론을 얻었다. 교차로 꼬리물기 위반 차량에 대한 단속 능력, 즉 위반차량 검지율 및 오검지율을 평가한 결과, 평균 검지율은 83.5%, 오단속률은 0.2, 오인식률 1.5%로 나타났다. 따라서 꼬리물기 위반 차량을 무인단속장비에 의해 단속을 할 수 있을 것으로 판단된다.

• Journal of Communications and Networks
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• 제11권2호
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• pp.157-165
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• 2009

In this paper, we investigate a dynamic spectrum sharing problem for the centralized uplink cognitive radio networks using orthogonal frequency division multiple access. We formulate a large-scale joint rate and power allocation as an optimization problem under quality of service constraint for secondary users and interference constraint for primary users. We also suggest admission control to nd a feasible solution to the optimization problem. To implement the resource allocation on a large-scale, we introduce a notion of using the conservative factors $\alpha$ and $\beta$ depending on the outage and violation probabilities. Since estimating instantaneous channel gains is costly and requires high complexity, the proposed algorithm pursues a practical and implementation-friendly resource allocation. Simulation results demonstrate that the large-scale joint rate and power allocation incurs a slight loss in system throughput over the instantaneous one, but it achieves lower complexity with less sensitivity to variations in shadowing statistics.

• 한국ITS학회 논문지
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• 제8권3호
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• pp.42-51
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• 2009

우리나라는 고속도로 차로 수에 따라 차종별로 통행차로를 지정하는 제도를 운영하고 있으며, 그 동안 제도의 유효성 논란 속에 폐지와 운영을 반복하며 시행되고 있다. 본 논문에서는 제도의 유효성을 검증하기 위해 고속도로 10개 구간을 대상으로 차로통행방법 위반율과 교통사고와의 연관성을 분석하였다. 그 결과 양(+)의 상관관계가 있는 것으로 나타나 위반차량에 대한 적극적인 단속이 요구되며, 본 논문에서는 차량번호판의 영상인식에 기반한 자동단속시스템 구축 방안을 제시하였다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1991년도 한국자동제어학술회의논문집(국내학술편); KOEX, Seoul; 22-24 Oct. 1991
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• pp.376-382
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• 1991

In the analysis of constrained holonomic systems, the Lagange multiplier method yields a system of second-order ordinary differential equations of motion and algebraic constraint equations. Conventional holonomic or nonholonomic constraints are defined as geometric constraints in this paper. Previous works concentrate on the geometric constraints. However, if the total energy of a dynamic system can be computed from the initial energy plus the time integral of the energy input rate due to external or internal forces, then the total energy can be artificially treated as a constraint. The violation of the total energy constraint due to numerical errors can be used as information to control these errors. It is a necessary condition for accurate simulation that both geometric and energy constraints be satisfied. When geometric constraint control is combined with energy constraint control, numerical simulation of a constrained dynamic system becomes more accurate. A new convenient and effective method to implement energy constraint control in numerical simulation is developed based on the geometric interpretation of the relation between constraints in the phase space. Several combinations of energy constraint control with either Baumgarte's Constraint Violation Stabilization Method (CVSM) are also addressed.

• 무역학회지
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• 제48권3호
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• pp.131-150
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• 2023

본 연구는 한국 바이오헬스 산업에 대한 미국의 수입거부(Import Refusals) 대응 방안 모색을 목적으로 한다. 이를 위해 수입거부 품목과 유형에 대한 정보가 포함된 한국무역협회 통관거부사례 데이터베이스를 활용하여 팬데믹 시기의 동향 분석을 시행하였으며, FDA 위반코드(Violation Code)에 따라 거부사유까지 분석하였다. 추가적으로 단위거부율(URR)의 측정을 통해 수입거부 대응 수준도 파악하였다. 분석 결과, 한국 바이오헬스 산업에 대한 미국의 주요 수입거부 품목은 과거 콘택트렌즈에서 코로나-19 이후 진단키트와 의약품으로 확대된 것으로 나타났으며, 주요 수입거부 사유는 의료기기와 의약품 관련법의 규정 미준수와 제품 및 시설에 대한 FDA의 미승인으로 확인되었다. 한편 바이오헬스 주요 품목의 단위거부율은 산업 평균보다 높게 측정되어 미국 수입거부 대응 수준이 낮은 것으로 파악되었다. 또한 FDA 위반코드에 따라 품목별 수입거부 사유를 분석한 결과는 다음과 같다. 우선, 콘택트렌즈와 코로나바이러스 진단키트의 주요 위반사항은 부정표시(Misbranding)에 해당한다. 이는 FDA에 관련 통지나 정보가 규정대로 제공되지 않았거나, 시판 중인 기승인 의료기기(Predicate Device)와 비교하여 본질적 동등성을 입증하지 못한 경우가 많다. 반면, 의약품은 유효성 및 안전성 입증 관련 규정에 따라 신청서의 승인을 받지 못한 미승인 신약(Unapproved New Drug)에 해당한다. 결과적으로 바이오헬스 산업의 수입거부는 무역기술장벽(TBT)과 밀접한 관련이 있다.