복운모화강암지역 지하수 중 자연방사성 물질의 경시적 붕괴특성 연구

김문수,김태승,김현구,김동수,정도환,주병규,홍정기,김혜진,박선화,정찬호,조병욱,한진석,Kim, Moon Su,Kim, Tae Seung,Kim, Hyun Koo,Kim, Dong Su,Jeong, Do Hwan,Ju, Byoung Kyu,Hong, Jung Ki,Kim, Hye Jin,Park, Sun Hwa,Jeong, Chan Ho,Cho, Byong 한국지하수토양환경학회 2013 지하수토양환경 Vol.18 No.4

To figure out the decay characteristics of naturally occurring radionuclides, eight sampled groundwaters from a monitoring borehole having high levels of uranium and radon concentrations in a two mica granitic area have analyzed by liquid scintillation counters (LSC) for over 1 year. In December 2011, three groundwater samples (DJ1, DJ2, DJ3) were obtained from each aquifer system located at -20 m, -40 m, -60 m of the monitoring borehole below the ground surface, respectively. Five samples (DJ4, DJ5, DJ6, DJ7, DJ8) were additionally gained from each aquifer positioned -20 m, -40 m, -60 m, -100 m, -105 m of the borehole in February 2012, respectively. Temporal variation characteristics of uranium and radon concentrations have showed over maximum 2.1 times and 1.4 times fluctuations of the values in the same sampling intervals over time, respectively. The intervals of -40 m and -105 m in the borehole have the highest values of uranium and radon concentrations, respectively. This may imply that the concentrations of naturally occurring radionuclides such as uranium and radon in groundwater have been changed over time and indicate that the qualities of groundwaters from the aquifers developed at each interval in the borehole are different each other. This discrepancy, moreover, could be caused by behaviour differences between uranium which is in ionic status having a half life of 4.6 billion years and is transported along with the flowing groundwater, and radon which is in gaseous status having a 3.82 day's half life in the aquifer systems. Physicochemical characteristics of groundwaters from the aquifer systems could be identified by the results of the on-situ measuring items such as pH and Eh, and the major ionic contents. The CPM values of eight groundwater samples analysed by LSC over one year have shown not to follow the theoretical decay curve of the radon. The CPM values of the samples have ranged from 2 to 7.5 after it had passed two months when the theoretical CPM values of the radon started zero since the initial analysis. Alpha and beta particle spectrums have shown the peaks of radium-226, however they have not revealed any peaks of radon and it's daughter products such as polonium-218 and 214, bismuth-214 for the late stage of the analysis. This implies that the groundwater from the borehole may contain radium-226 having a half life of 1,600 years which decays continuously.

소부대 전술 훈련을 위한 개체기반 워게임 모델과 전차시뮬레이터 연동에 관한 연구

김문수,김대규,권혁래,이태억,Kim, Moon-Su,Kim, Dae-Kyu,Kwon, Hyog-Lae,Lee, Tae-Eog 한국군사과학기술학회 2012 한국군사과학기술학회지 Vol.15 No.1

In this thesis, we propose an integrated simulation method of virtual tank simulators and an entity-based constructive simulation model for small unit tactical training. To do this, we first identify requirements for virtual-constructive integrated simulation in a synthetic environment. We then propose a virtual and constructive interoperation method where individual combat entities of virtual-constructive models are interacting with each others. We develop a method of aggregating individual combat entities into a larger combat unit and disaggregating an unit into entities from time to time. We also present a way of sharing synthetic environment information between the models. Finally, we suggest that for more effective interoperability, virtual and constructive models should be developed by using common combat object models. The proposed interoperation method can be extended to further live-virtual-constructive models.

변형 LeFort III 골절단술을 이용한 중안면 성장부전을 동반한 하악전돌증의 치험례

김문수,김수관,류종희,Kim, Moon-Soo,Kim, Su-Gwan,Ryu, Chong-Hoy 대한악안면성형재건외과학회 2001 Maxillofacial Plastic Reconstructive Surgery Vol.23 No.2

Maxillary-malar deficiency is the most frequently occurring midface dentofacial deformity. Clinicaly patients with maxillary-malar deficiency exhibit malar and infraorbital rim deficiency and class III malocclusion. For treatment of these deformities, modified LeFort III osteotomy have been used. Modified LeFort III osteotomy advances maxilla with orbital rims and zygomatic bone anteroposteriorly. This is a case of patient who had severe mandibular prognthism with midface deformity. We performed modified LeFort III osteotomy for maxillary-malar advancement and simultaneous bilateral sagittal split ramus osteotomy for mandibular prognathism and autogenous iliac bone graft. 본 교실에서는 조선대학교 구강악안면외과에 내원한 중안면성장부전을 동반한 하악전돌증소견을 보이는 22세 여자 환자의 치료에 있어서 변형 LeFort III 골절단술과 양측 하악지 시상분할골절단술 그리고 자가 장골 이식술을 동시에 시행하여 기능적 심미적으로 만족할 만한 결과를 얻었기에 보고하는 바이다.

병렬형 모듈레이터를 이용한 자기 감속기

김문수(Moon Su Kim),정광석(Kwang Suk Jung) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12

From the ferromagnetic modulator located between two magnet arrays, the radial magnetic fields of the two magnet arrays could be synchronized using harmonic components generated at the other side. For the given pole number of a magnet array linked with high speed rotor, a pole number of another magnet array linked with low speed rotor is decided through the modulator considering the desired reducing ratio. In this paper, a novel magnetic reducer with the parallel modulator is introduced for an easy assembling and a high reducing ratio. The feasibility of the proposed concept is verified by a harmonic analysis and the real hardware implementation.

정부소유권과 민영화 공기업의 경영효율성

김문수(Moon-Su Kim),안지영(Ji-Young Ahn),한중호(Joong-Ho Han) 한국산업경제학회 2013 산업경제연구 Vol.26 No.5

Dewenter and Malatesta(2001)은 민영화에 따른 공기업의 성과개선이 민간으로 경영권이 이양되는 시점 3년 전에 일어남을 보여 정부의 공기업 효율성개선 노력이 민영화의 긍정적 효과를 가져오는 중요한 원인일 가능성을 지적하였다. 본 연구는 Dewenter and Malatesta(2001)이 제시한 정부주도의 민영화 공기업 성과개선 효과를 경험적으로 분석하기 위해 민영화 이전의 정부경영권이 완전한 공기업(소유지분 50% 이상)과 그렇지 않은 기업의 민영화시점 전후의 성과개선 효과를 경험적으로 분석하고 정부의 성과개선의지가 실질적인 영향을 미칠 수 있는 공기업(소유지분 50% 이상)인 경우 민영화 시점 최소 3년전에 기업의 수익성이 개선됨을 보인다. 이러한 결과는 공기업 민영화의 긍정적인 효과를 가져오는 중요한 원인이 정부의 공기업 성과개선 노력이며 민영화의 효과성(effectiveness)에 영향을 미치는 중요한 환경적 요인이 정부의 경영권확보임을 의미한다. Dewenter and Malatesta (2001) show that privatization of public enterprise improves firm performance 3 years before privatization, suggesting that the transfer of control to private investors may not the only source of the improvement in firm performance of public enterprise. In order to shed light on the perplexing finding by Dewenter and Malatesta (2001), we examine the effect of government’s incentive to improve firm performance of public enterprise scheduled to be privatized. This paper shows that privatization of public enterprise with greater then 50 percent ownership by government experiences significant performance improvement three years before its privatization, while there is no such effect for the privatization of public enterprise with government ownership less than 50 percent of the stock. The findings are robust for different specifications, being consistent with the notion that government with the full controlling rights before privatization can effectively improve firm performance to maximize revenue from privatization.

지속가능한 전시에 대한 인식이 전시회 참가자의 참여가치 및 자아존중감에 미치는 영향

김문수(Moon-Su Kim),김은희(Eun-hee Kim),김미소(Mi-so Kim),김철원(Chul-won Kim) 한국관광연구학회 2017 관광연구저널 Vol.31 No.2

공공하수처리시설의 운영관리분석을 통한 탄소중립 방안 연구

김문수 ( Moon-su Kim ),송재준 ( Jee-june Song ) 한국환경기술학회 2023 한국환경기술학회지 Vol.24 No.1

This paper uses data from public sewage treatment facilities in G city, Jeollanam-do, to study the carbon neutrality of public sewage treatment facilities by calculating the ratio of TOC/T-N according to removal efficiency and the amount of power consumed per 1 m³ of sewage and comparing the numbers to the national data. All 55 public sewage treatment facilities in G city are advanced treatment facilities, with 3 large-scale facilities with a treatment capacity of 500 m³/day or more and 52 small-scale facilities with a treatment capacity of less than 500 m³/day. While the treated waters satisfied the effluent water quality standards, the removal efficiency of T-N and T-P was lower than that of the other items. It is judged that the decrease in T-N efficiency is due to a low C/N ratio, and the ratio of TOC/T-N was calculated as the effluent water quality standard changed from chemical oxygen demand (COD) to total organic carbon (TOC) from 2021. For G city it is 1.5±0.5 when the treatment efficiency is 72.3±4.8 %. While an increase in processing capacity tends to increase power consumption, power consumption per volume of swages processed tends to be lower for bigger facilities. In the case of G city, high-capacity facilities use on average of 1.5±1.2 kWh/m³ and 2.0±1.4 kWh/m³ for small-capacity facilities. 4 year average on national-wide facilities shows 0.55±0.19 kWh/m³ for high-capacity facilities, and 1.76±0.05 kWh/m³ for low-capacity facilities, with low-capacity facilities tending to use 3.2 times more power per volume of sewage processing. We conclude that for sewage treatment, large-scale facilities rather than small-scale facilities seem to be more effective for carbon neutrality.

만성 골수염 환자의 임상적 연구

김문수(Moon Soo Kim),김수관(Su Gwan Kim),여환호(Hwan Ho Yeo),김소영(So Young Kim),김수민(Soo Min Kim),이준길(Jun Gil Lee),조경안(Gyeong An Cho),박인순(In Soon Park) 대한구강악안면외과학회 2000 대한구강악안면외과학회지 Vol.26 No.5

Chronic osteomyelitis is often considered difficult to treat and may lead to refratory condition in oral and maxillofacial region. Clinical features of chronic osteomyelitis includes pain, swelling, pus discharge, and radiographic change. There are many kinds of treatment of chronic osteomyelitis. One of the most important factors in treating osteomyelitis are removal of infectious foci and administration of massive antibiotics. Recently we reviewed 29 patients with chronic osteomyelitis who visited in our department and treated successfully with our treatment protocols, consisting of surgical intervention and intravenous antibiotics for 2 weeks, and followed by oral antibiotics for 6 weeks. It is concluded that combination of surgical intervention and antibiotic therapy are sufficient to treat the chronic osteomyelitis in oral and maxillofacial region.

이축 방향의 복합 자기 경로를 갖는 마그네트 기어

김문수(Moon Su Kim),정광석(Kwang Suk Jung) Korean Society for Precision Engineering 2014 한국정밀공학회지 Vol.31 No.6

논문 : 괴산지역 시추공 지하수의 자연방사성물질 산출특성과 지화학적 기원

김문수 ( Moon Su Kim ),양재하 ( Jae Ha Yang ),정찬호 ( Chan Ho Jeong ),김현구 ( Hyun Koo Kim ),김동욱 ( Dong Wook Kim ),조병욱 ( Byung Uk Jo ) 대한지질공학회 2014 지질공학 Vol.24 No.4

지하수내 존재하고 있는 자연방사성물질인 우라늄과 라돈-222의 산출특성과 지화학적 기원을 알아보기 위해 괴산지역 연구부 지내 120 m 깊이의 지하수 관정을 시추하여 심도별 시추코어의 암석화학적 특성과 지하수의 화학적 특성을 분석하였다. 시추코어 샘플 분석과 함께 더블패커시스템과 베일러를 이용하여 8개의 심도별 지하수 시료를 채취하여 지화학적 특성 분석을 수행하였다. 시추코어 분석결과, 주요 암종은 화강반암과 점판암이었으며 일부 구간에서는 탄산염암과 석회규산염암, 페그마타이트가 확인되었다. 심도별 지하수의 pH는 7.8~8.4의 범위이며, 화학적 유형은 Na-HCO3형태를 보였다. 암석 및 광물 내 우라늄과 토륨의 함량은 각각 < 0.2~14.8 ppm과 0.56~45.0 ppm의 범위였으며, 암석현미경과 전자현미경(EPMA) 관찰 결과 자연방사성원소(우라늄) 함유 광물은 흑운모내 포획된 모나자이트 광물인 것으로 확인되었다. 우라늄은 이들 광물의 주요 구성원소를 치환하여 존재하는 것으로 보이며 파쇄대와 같은 주요 대수층 구간에서 용해되어 지하수와 함께 용출되는 것으로 보인다. 라돈-222의 함량은 우라늄의 함량과 어떠한 상관성을 보이지 않았으며 향후, 라돈가스 기원 추적을 위해서는 헬륨과 네온 등 영족기체 동위 원소비를 이용한 간접적인 방법을 적용하여 분석할 필요가 있을 것으로 판단된다. The origins and varieties of natural radioactive materials, including uranium and radon-222, were examined in a drilled borehole extending to a depth of 120 m below the surface in the Goesan area. In addition to core samples, eight groundwater samples were collected at different depths, using a double packer system and bailer, and their geochemical characteristics were determined. Most of the rock samples from the drilled core consisted of granite porphyry, with sedimentary rocks (slate, carbonate, or lime-silicates) and pegmatite occurring in certain sections. The pH of samples varied from 7.8 to 8.4, and the groundwater was of a Na-HCO3type. Uranium and thorium concentrations in the core were < 0.2-14.8 ppm and 0.56-45.0 ppm, respectively. Observations by microscope and an electron probe microanalyzer (EPMA) showed that the mineral containing the natural radioactive materials was monazite contained in biotite crystals. The uranium, which substituted for major elements in the monazite, appeared to have dissolved and been released into the groundwater in a shear zone. Concentrations of Radon-222 in the borehole showed no close relationship with levels of uranium. The isotopes of noble gases, such as helium and neon, would be useful for analyzing the origins and characteristics of the natural radioactive materials.