도로시설물의 자산관리를 위한 자산가치평가방법에 관한 연구

안재민,박종범,이동열,이민재,An, Jae-Min,Park, Jong-Bum,Lee, Dong-Youl,Lee, Min-Jae 한국건설관리학회 2012 한국건설관리학회 논문집 Vol.13 No.4

도로시설물은 국가 경제 활동의 기반을 형성하는 기초적인 시설물이며 국가에 필수적인 기반 시설물이다. 현재 국내 관리대상 도로시설물은 해마다 증가하고 있으며, 이에 따른 유지관리비 예산의 상승이 예상된다. 이와 같이 건설되어 축적된 도로시설물에 대한 비용 효율적 관리를 위해서는 자산이 지닌 가치를 객관적으로 나타낼 수 있는 지표가 필요할 것이다. 이러한 지표는 자산가치로써 화폐단위로 나타낼 수 있다. 국외에서는 자산관리 및 자산가치평가에 대한 연구가 활발히 진행되고 실제 공용중인 도로시설물에 적용을 하고 있지만 국내에서는 이에 대한 준비나 연구가 부족한 상황이다. 본 논문은 도로시설물의 자산관리를 위한 합리적인 자산가치평가를 도출하기 위한 방법으로 자산가치평가방법을 기존의 문헌과 연구 자료를 통하여 조사 및 정리를 하였다. 이를 바탕으로 도로시설물에 자산가치평가방법들을 적용하기 위하여 국내 실정과 특성이 반영된 자산가치 프로세스를 개발하였다. 개발된 자산가치 프로세스에 따라 실제 공용중인 도로시설물을 적용하고 그 결과를 분석하여 각 자산가치평가방법들의 활용방안을 도출하였다. 또한, 가장 활용성이 높은WDRC(Written Down Replacement Cost)방법을 이용하여 자산관리업무 수행 절차를 위한 자산 관리 업무지원 모식도를 제시하였다. Infrastructure are the essential element in the country for they are the basic facilities forming the basis of economic activity. In Korea Infrastructure which are subject to the management of government are increasing annually, and subsequently the budget of maintenance costs is expected to rise significantly. For the effective management of the constructed and accumulated infrastructure, the integrated management of the future assets will be needed which includes the determination of the asset status, management subjects, and the location, the maintenance of their performance and state, and the prediction of the cost required to increase their useful lifetime. However, in the domestic cases the road facilities valuation has not been done systematically, and the preparation and research on this is scarce. Thus, the systematic procedure for the road facilities valuation is required. In this paper the following study was conducted to derive the reasonable asset valuation methods. First, the valuation methods was investigated and summarized throughout the domestic and international research literature. Second, to apply the investigated valuation methods to the road facilities the valuation process that reflects domestic conditions and characteristics has been developed. Third, a working Bridge, Highways, and General national ways were applied to the general valuation process, and the results were analyzed. As a final step a schematic diagram of the asset management support by WDRC valuation method was presented.

이동통신분야의 표준화 전망

안재민,김은정,An, Jae-Min,Kim, Eun-Jeong 한국정보통신기술협회 2007 TTA저널 Vol.109 No.-

맞춤형 진로교육을 위한 웹기반 SMTS의 설계와 구현

안재민,박대우,An, Jae-Min,Park, Dea-Woo 한국정보통신학회 2010 한국정보통신학회논문지 Vol.14 No.10

고등학교에서 학생의 진로교육에 대한 기본 자료는 교육과학기술부에서 지원하는 NEIS의 교무업무시스템과 담임교사 중심의 진로교육 자료가 오프라인 형태로 관리 및 운영되고 있어, 학생들의 진로교육을 위한 실질적 의사결정 시스템으로서 활용하기에 어려움이 있다. 본 논문에서는 학생들의 맞춤형 진로교육을 위한 e포트폴리오, 성적 및 상담자료 등을 DB로 구축하여, 인터넷 웹 기반의 학생관리통합시스템(SMTS: Student Management Total System)을 설계하고 구현한다. 이 결과 교사들은 학생의 소질과 적성을 고려한 맞춤형 진로교육을 실시하여, 건전한 직업관을 가진 미래의 국가자원으로 성장시키고자 하는데 그 목적이 있다. As basic data about students' career education in high school are being managed only in forms of NEIS, which is supported by Ministry of Education, Science and Technology, and the information for career education that homeroom teachers have operated by off-line system, it is hard to use them as practical decision support system for students' career education. In this study, we intend to design and embody web-based Student Management Total System by constructing DB of students' e-portfolios, school records and counselling data etc. As a result, teachers can carry out vocational education that is considered students' talents and aptitude, and we have a goal for promoting the growth of the students as the national human resources who have sound occupational consciousness through this education.

가정용태양광 발전설비의 전력품질 측정에 관한 연구

안재민(Jae-Min Ahn),한운기(Woon-Ki Han),정진수(Jin-Soo Jung),김선구(Sun-Gu Kim),김재철(Jae-Chul Kim) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7

This paper describe the power quality measuring result of the inter-connected residental PV system. The power quality measuring for inter-connected residental PV system are important to verify their performance and effect of power distribution system with inter-connected residental PV system. Also, these power quality measuring and analysis are essential to improve electrical safety. In order to evaluate influence of power distribution system with inter-connected residental PV system, we measure and analyze power quality index such as power, voltage, current, harmonic, THD, flicker index, power factor and frequency using DEWE5000.

IEC 61660-1기반 직류배전시스템의 단락전류 검토

안재민(Jae-Min Ahn),김기현(Ki-Hyun Kim),전정채(Jeong-Chay Jeon),임용배(Young-Bae Lim),배석명(Seok-Myeong Bae),이경호(Kyoung-Ho Lee) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.11

We investigated a short-circuit current for DC distribution system based on the IEC 61660-1. Short-circuit currents of DC distribution system are addition of four partial short-circuit currents which are rectifiers in three-phase AC bridge connection, stationary batteries, smoothing capacitors, DC motors. Each of four partial short-circuit current be calculated by standard approximation function.

PSCAD/EMTDC를 이용한 저전압 직류 배전 시스템의 단락 고장 전류 분석

안재민(Jae-Min Ahn),전정채(Jeong-Chay Jeon),임용배(Young-Bae Lim),배석명(Seok-Myeong Bae),변길성(Gil-Sung Byeon),이경호(Kyoung-Ho Lee) 대한전기학회 2010 전기학회논문지 P Vol.59 No.4

In this paper, we analyzed the short circuit current of a low voltage direct current distribution system. For the analysis, we performed the modeling of the low voltage direct current distribution system with a 6-pulse three-phase thyristor rectifier using the PSCAD/EMTDC, surveyed impedance of sources, transformers and distribution lines to run a simulation. A result of the simulation is that short circuit currents of the direct current distribution system with the rectifier decreased due to a thyristor-ON-resistance(Ron). But in case of the low thyristor-ON resistance, output fault current of the rectifier increased over three-phase short circuit current of an AC power system without a rectifier by regular ratio of the rectifier. Because the output fault current of the rectifier can increase over interrupting the capacity of circuit breakers, studying short circuit currents of a low voltage direct current distribution system with a rectifier is necessary for introducing the direct current distribution systems.

계층다상부호 기반 위성항법 측위신호의 서비스 멀티플렉싱 기법

안재민(Jae Min Ahn),한상권(Sang Kwon Han),김갑진(Kap-Jin Kim),송기원(Ki-Won Song) 제어로봇시스템학회 2017 제어·로봇·시스템학회 논문지 Vol.23 No.6

A new service multiplexing technique for ranging signals of satellite navigation systems based on the tiered polyphase code family is proposed. Two different services are spread by their spreading code and multiplexed into in-phase and quadrature components. The multiplexed signal is masked by the secondary code, which has a complex value to achieve additional processing gain and interference reduction. The envelope variation of the ranging signal generated by the proposed technique can be maintained at a constant level even with the polyphase mask code. The analysis of the envelop variation shows that the proposed multiplexing technique outperforms code-based service multiplexing in terms of peak-to-average power ratio. The simulation results on the symbol error rate performances of the multiplexed services show that the multiplexed services do not interfere with each other with appropriate receiver operations.

폐광산 인근 지역에서 생산된 농산물의 중금속 안전성 평가

안재민 ( Jae-min An ),이혜민 ( Hye-min Lee ),김익로 ( Ik-ro Kim ),박대한 ( Dae-han Park ),이광희 ( Gwang-hee Lee ) 한국환경농학회 2019 한국환경농학회 학술대회집 Vol.2019 No.-

This study was carried out to risk assessment of lead(Pb), cadmium(Cd), and inorganic arsenic(I-As) contamination in agricultural products at abandoned mine area in 25 crops including rice and vegetables. The 36 typical investigation sites located in Gyeongbuk provincial area were selected by considering the heavy metal levels, that had been known that the amount of the heavy metals exceeded the contamination level based on the previous survey. The collected 25 agricultural products were rice, radish, potato, sweet potato, bracken, pepper, soybean, jujube, welsh onion, ballon flower, perilla leaves, peanut, garlic, japanese apricot, korean cabbage, peach, chinese chives, apple, wild berry, cabbage, onion, maize, sesame, chwinamul, and squash. The various samples were collected and performed using microwave device and ICP/MS in lead and cadmium(n=1,059). Inorganic arsenic was treatment of 1% nitric acid and using HPLC-ICP/MS(n=365). The Limit of detection(LOD), Limit of quantification(LOQ), and correlation coefficient(R²) for heavy metals were 0.38-0.87 μg/kg, 1.14-2.61 μg/kg, and 0.9998-1.0000, respectively. The recovery results and coefficient of variations were in the range 90.9-102.4%, and 3.7-5.8%, by tested certified reference materials(CRMs). The contents of lead were N.D.-0.227 mg/kg(sesame 0.040±0.085 mg/kg, ballon flower 0.039±0.056 mg/kg, sweet potato 0.034±0.058 mg/kg), cadmium were N.D.-0.958 mg/kg(ballon flower 0.244±0.164 mg/kg, welsh onion 0.145±0.133 mg/kg, sesame 0.124±0.136 mg/kg), and inorganic arsenic was 0.120±0.054 mg/kg(only rice minimum N.D., and maximum 0.246 mg/kg) in agricultural products. For risk assessment, daily intakes of heavy metals were calculated and compared with provisional tolerable weekly intake(PTWI) or provisional tolerable monthly intake(PTMI) established by the Joint FAO/WHO Expert Committee on Food Additives(JECFA). The dietary exposures of lead for general population were 7.0×10^-5-1.7×10⁰ μg/day, taking 1.8×10^-4-4.6×10⁰% of PTWI. The dietary exposure of cadmium for general population were 5.2×10^-4-7.2×10⁰ μg/day, corresponding to 1.0×10-3-1.4×10¹% of PTMI. The dietary exposure of inorganic arsenic for general population were 1.7×10¹ μg/day, corresponding to 2.2×10¹% of PTWI. Conclusively, it requires to consider the critical levels of heavy metals agricultural products due to unexpectedly high levels in few places while amount of heavy metals in the samples were relatively low in most areas.

가정용 분산전원 연계시 누전차단기 접속에 관한 연구

안재민(Jae-Min AHN),한운기(Woon-Ki Han),유재근(Jae-Geun Yoo),배석명(Suk-Myeong Bae),김재철(Jae-chul Kim) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.4

가정용 분산전원 연계시 누전차단기 설치에 대해 분석하였다. 가정용 분산전원 연계시 양방향의 조류로 인해 누전차단기 설치시 역접속의 우려가 있으며 분산전원 측을 l차 측으로 판단하여 설치하는 경우가 발생하고 있다. 이러한 문제는 기준이 마련되지 않은 국내 환경의 영향으로 개선되어야 할 것으로 사료된다. 일본의 산업 규격인 JIS 3588에서는 분산전원용 누전차단기 설치를 규정하고 있으며 양방향성 누전차단기를 권장하고 있다. 이러한 기준은 국내에도 도입할 필요가 있다.

국내 다소비 농산물의 알루미늄 농도 모니터링 및 농산물 섭취로 인한 위해도 평가

안재민 ( Jae Min An ),홍경숙 ( Kyong Suk Hong ),김성연 ( Sung Youn Kim ),김지혜 ( Ji Hye Kim ),유경은 ( Kyong Eun Yu ),김효영 ( Hyo Young Kim ),박형달 ( Hyoung Dal Park ),이재훤 ( Jae Hwon Lee ),김동호 ( Dong Ho Kim ) 한국환경농학회 2015 한국환경농학회지 Vol.34 No.4

BACKGROUND: This study was carried out to collect occurrence data on aluminum in 12 type agricultural products and assess dietary exposure risk to the Korean population health for aluminum concentration in agricultural products.METHODS AND RESULTS: Aluminum analysis samples were performed using microwave device and Inductively Coupled Plasma Optical Emission Spectrometer. The LOD(Limit of Detection) for aluminum was 0.851 ug/kg,while the LOQ(Limit of Quantitation) was 2.838 ug/kg and recovery was 97.6% for aluminum. The average levels of aluminum in mg/kg were 0.526 for rice, 0.546 for Korean cabbage, 1.316 for corn, 6.207 for soybean, 0.549 for sweet potato, 0.257 for potato, 6.963 for spinach, 1.213 for carrot,0.524 for garlic, 0.950 for radish, 1.015 for leek, and 3.511 for Welsh onion. The dietary exposures of aluminum through usual intake were polished rice 89.31 ug/day,Korean cabbage 33.14 ug/day, corn 0.66 ug/day, soybean 3.72 ug/day, sweet potato 6.86 ug/day, potato 4.96 ug/day,spinach 45.96 ug/day, carrot 6.79 ug/day, garlic 2.36 ug/day, radish 7.32 ug/day, leek 2.23 ug/day and Welsh onion 43.89 ug/day, taking 0.57%, 0.21%, 0.00%, 0.02%,0.04%, 0.03%, 0.04%, 0.04%, 0.02%, 0.05%, 0.01% and 0.28% of PTWI(2 mg/kg b.w./week), respectively.CONCLUSION: The levels of overall dietary exposure to aluminum for Korean population through intake of agricultural product was far below the recommended JECFA level, indicating of least possibility of risk.