CO2 curing effects of concrete products made using fly ash and blast furnace slag

박진오,이종찬,이세현 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.9

In order to analyze the effects of fly ash and blast furnace slag on CO2 uptake and compressive strengths in CO2 curing, twotests were carried out. First, the compressive strength test of a non CO2 cured specimen and a specimen with W/C 30% and20% admixture was conducted at three hours and three days while curing in a chamber with 20 oC and RH 60% after CO2curing for an hour. Second, the compressive strength test of a non CO2 cured specimen and a specimen with W/C 35-40% and10% admixture was conducted at 7 days and 28 days while curing in chamber with 60 oC and RH 100% after steam curingat 20 oC and RH 60% and CO2 curing for 2 hrs. In the first test results, the CO2 uptake rate of the case with 20% of admixturewas found to be 2% lower than the case without admixture, and CO2 curing turned out to be very effective in increasing theearly compressive strength. The second test results showed that CO2 uptake rate of the case with fly ash and blast furnace slagwas found to be similar with the case without admixture. Even in terms of increasing the compressive strength, CO2 curingof two hours was found to exhibit a similar strength development effect to steam curing of 4 hrs.

중국의 조세제도 개편 방향과 그 한계에 관한 小考 -소비세와 주택재산세의 지방정부 세수원 귀속추진과 한계를 중심으로-

박진오 한중사회과학학회 2020 한중사회과학연구 Vol.18 No.3

중국은 온전한 시장경제체제의 불완전과 법⋅제도적 체제의 미비속에서 경제와 사회의 초고속 성장을 이룩하였다. 이러한 초고속성장의 배경과 이면에는 중앙과 지방정부또는 각 지방정부간의 성과지표에 따른 경쟁관계속에서 이들 정부주체의 적극성이 개입되었다고 볼 수 있다. 개혁개방이후 각급정부가 각자도생식의 외자 유치를 통해 더욱양호한 투자환경조성에 경쟁적으로 나서면서 지역경제의 고속발전을 가져왔다. 재정의주요 기반이 되는 세수는 국가의 정상적 운영과 발전에 필수요소이자 경제의 기본 명맥이라고 할 수 있다. 1994년의 분세제개혁은 결과적으로 지방세수체계의 불안정과 함께세수입법권과 징수권한의 중앙집중현상을 가져왔다. 아울러 세수구조측면에서는 징수범위가 광범위하면서 안정적 세원으로 자리매김한 세수는 중앙정부나 중앙과 지방의공통세로 귀속된 반면, 지방정부의 전속관리로 지방정부로 귀속되는 세수의 경우는 그종류는 많으나 징수범위가 협소하고 세원이 분산되면서 징수의 난이도가 커 각 지방정부의 사업지출권에 상응하는 재원으로서의 기능을 상실하면서 중앙정부로부터 보조를받는 재정이전지불제도에 의존하는 결과를 초래하였다. 아울러 분세제는 기존의 중앙과 지방정부간의 전통적 경쟁관계에서 탈피하여 각 지방정부의 해당지역발전을 위한지대추구행위가 일상화되는 주요계기로 작용하였다. 분세제 시행이후 결과적으로 중앙정부의 공공재 공급능력의 제고와 개선을 가져왔는데, 2016년 영업세의 증치세 편입조치에 따라 오랫동안 지방정부의 대표적 세원으로 자리잡은 영업세가 폐지되면서 지방정부 주력세수의 결핍과 함께 재정 안정성이 위협받는 국면이 초래되었다. 이러한 상황하에서 향후 지방정부의 재정적 뒷받침이 되어줄 수 있는 주요 세원 확보는 중국 지방정부의 재정건전성 제고와 함께 오랜 숙원사업이기도 했던 조세제도 개편과 맛물려 주요과제로 떠올랐다. 중국은 기 폐지된 영업세를 대체하면서 지방정부의 재정자주권을 지속가능하게 확보할 수 있도록 하는 세제개혁방안 중 현 중앙정부 세수인 소비세의 지방세 전환과 부동산세(주택재산세) 도입 검토에 착수하였다. 그런데 소비세의 지방세 전환 추진의 주요 한계점은 자칫 지방정부간 재정불균형을 오히려 가중시킬 수 있다는 점이다. 즉, 소비세의 부과가 생산단계에서 소비단계로 전환되는 경우 지역별 소비자의 소비역량과 상품별 소비집중도에 따라 지역별 편차가 나타날 수 있다는 점이며, 특히 지방정부의 세수관련 독립적 입법권이 없는 현행 법체계하에서 지방정부간 소비세 과세관련 경쟁심화로 이어질수 있다는 점이 한계로 지적된다. 주택재산세 도입과 관련해서는이를 시행하고 있는 여타국가와 비교할 떄 납세자의 세부담능력 등 기본여건은 성숙되었다고 보여지나, 전면시행을 위한 입법계획단계에서 아직 큰 진전을 이루지 못하고 있다는 점이 당국의 시행의지와 관련한 현실적 한계점으로 지적된다. 또한 상해와 중경 두곳의 시범실시 사례에서 나타난 바와 같이 주택재산세의 과세대상을 지나치게 협소하게 설계하여 여기에서 확보되는 세원(稅源)은 지방정부의 재정확충이나 재정자립도와크게 동떨어져 있다는 점이다. 또한 1986년의 주택재산세 부과와 관련한 조례에는 비영업성 개인보유주택은 과세대상에서 제외되어 있어, 이를 포함하고... China achieved high-speed economic and social growth amid the imperfections of the market economy system and the lack of legal and institutional systems. Behind this rapid growth is the involvement active competition between central and local governments or between local governments based on performance indicators. After the reform and opening up, governments of various levels competed to create a better investment environment by attracting foreign capital of their own, bringing about rapid development of the local economy. Tax revenues, the main foundation of finance, are essential to the normal operation and development of the country and the basic economic context. The 1994 reform of the tax system resulted in a central concentration of tax revenue laws and collection authority, along with instability in the local tax system. In addition, in terms of tax revenue structure, tax revenues, which have a wide and stable tax base, were attributed to the tax of the central government or to the common tax of the central and local governments, while tax revenues, which were attributed to the local government’s exclusive management, had many types but the narrow scope of collection and the dispersion of tax sources, resulted in the loss of functions as financial resources equivalent to the right of each local government’s business expenditure, resulting in relying on the central government’s financial support system. Furthermore, the taxation system broke away from the traditional rivalry structure between the central and local governments and served as a major opportunity for local governments to pursue rent-seeking aspects for the development of their respective regions. As a result the central government’s ability to supply public goods has been enhanced and improved since the implementation of the taxation system in 1994, and the abolition of the business tax, which has long been a representative tax source of local governments, has led to a situation in which financial stability is threatened along with the lack of local government’s main tax revenue. Under these circumstances, securing major tax sources that could provide financial support for local governments in the future has emerged as a major task as well as reforming the tax system, which has long been a long-cherished project, along with enhancing the financial soundness of the Chinese local government. China has begun reviewing the conversion of the consumption tax, the current central government tax, and the introduction of the real estate tax (housing property tax) among the tax reform measures to ensure sustainable financial independence of local governments while replacing the abolished business tax. However, the main limitation of promoting the conversion of consumption tax to local tax is that it can increase the fiscal imbalance between local governments. In other words, when the imposition of consumption tax is shifted from production to consumption basis, regional variations may occur depending on the consumption capacity of each region and the concentration of consumption by product. The limitation is pointed out that local governments can lead to fierce competition related to tax excise among local governments under the current legal system without independent legislative powers related to tax collection. In regards to the introduction of housing property tax, the basic conditions such as taxpayer’s ability to pay tax are considered to be mature when compared with other countries that implement it, but It is pointed out as a relevant practical limitation that the government’s willingness to implement it has not made much progress in the legislative planning stage for full implementation. In addition, as shown in the trial cases of two places in Shanghai and Chongqing, the taxation of housing property tax is too narrowly designed, which means that the tax collected here is far from the fiscal expansion or fiscal independence of local governme...

IBM-PC용 범용Interface board

박진오 檀國大學校 1991 飛電 Vol.11 No.-

Dependence of Photothermal Responses on Wavelengths

박진오,표한재,최종만,정석,강현욱 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.74 No.3

The goal of the current research is to identify dependence of photothermal responses on wave- lengths for diuser-assisted treatment of liver tumor. For interstitial photothermal treatment, four commercially available wavelengths were tested: 532, 808, 980, and 1470 nm. A thermal camera was employed to record spatio-temporal development of temperature in porcine liver tissue. Spatial dis- tribution of temperature and coagulation was quantitatively evaluated at various irradiation times. Both 808 and 980 nm presented a comparable maximum temperature after delivery of 200 J. On the other hand, both 532 and 1470 nm induced the higher maximum temperatures of over 90 C along with a wider thermal distribution. The degree of the coagulation for both 532 and 1470 nm was quite consistent along the diusing tip as various distances showed the comparable coagulation thickness. Both 808 and 980 nm presented the varying degree of the coagulation (1 2 mm in thickness). The largest volume along the thickest radial coagulation was observed after 1470 nm laser irradiation (606:9 21:0 mm3) whereas the smallest volume was created by 980 nm (77:1 13:3 mm3). The current results demonstrated that due to strong light absorption, both 532 and 1470 nm could be the feasible wavelengths for the treatment of liver tumor.

LoRa 센서네트워크 기반의 무선교량유지관리 시스템 구축

박진오,박상헌,김경수,박원주,김종훈 한국전산구조공학회 2020 한국전산구조공학회논문집 Vol.33 No.2

The IoT-based sensor network is one of the methods that can be efficiently applied to maintain the facilities, such as bridges, at a low cost. Inthis study, based on LoRa LPWAN, one of the IoT communications, sensor board for cable tension monitoring, data acquisition board forconstructing sensor network along with existing measurement sensors, are developed to create bridge structural health monitoring system. Inaddition, we designed and manufactured a smart sensor node for LoRa communication and established a sensor network for monitoring. Further, we constructed a test bed at the Yeonggwang Bridge to verify the performance of the system. The test bed verification resultssuggested that the LoRa LPWAN-based sensor network can be applied as one of the technologies for monitoring the bridge structuresoundness; this is excellent in terms of data rate, accuracy, and economy. 사물인터넷 기반의 센서네트워크는 저렴한 비용으로 효율적으로 교량 등의 시설물 유지관리에 적용할 수 있는 한 방안이다. 본 연구에서는 사물인터넷 통신의 하나인, LoRa LPWAN 기반으로 교량 구조건전성모니터링을 위한 시스템을 개발하기 위해서 케이블 장력 모니터링을 위한 센서보드, 기존 계측 센서들과 함께 센서네트워크를 구축하기 위한 DAQ 보드, 데이터들 처리하고 LoRa 통신을위한 스마트센서노드를 설계 및 제작하였으며 모니터링을 위한 센서네트워크를 구축하였다. 또한 본 시스템의 성능검증을 위해 영광대교에 Test Bed를 구축하여 교량 구조건전성 모니터링을 위한 센서네트워크에 적용가능성 여부를 살펴보았다. Test Bed 검증 결과LoRa LPWAN 기반 센서네트워크는 데이터 전송률, 정확도, 경제성면에서 교량 구조 건전성 모니터링의 기술 중에 하나로 적용될 수있으며, 향후 교량구조물 뿐만 아니라 다양한 공공기반 시설물에 유지관리를 위한 시스템으로 보급될 수 있기를 기대한다.

인공발목관절의 임상시험 가이드라인 개발을 위한 문헌적 고찰

박진오,이모세,이진우,이수빈,한승환,Park, Jin Oh,Lee, Moses,Lee, Jin Woo,Lee, Soo Bin,Han, Seung Hwan 대한족부족관절학회 2014 대한족부족관절학회지 Vol.18 No.4

Purpose: The purpose of this study is to develop guidelines for clinical trial of the total ankle replacement system for premarket approval. Materials and Methods: We selected and analyzed nine peer-reviewed articles whose quality had been proven in a previous phase. Two investigators extracted parameters for guideline criteria, including number of cases, patient age, follow-up period, failure rate, radiographic osteolysis rate, residual pain rate, and percentage of satisfaction. In addition, the inclusion and exclusion criteria were analyzed and developed. Results: Eight level IV studies and one level II study were included. The average number of cases was 159 cases and the mean patient age was 63.5 years. The mean follow-up period was 4.2 years, ranging from two to nine. The average failure rate of total ankle replacement in mid- to long-term follow-up was approximately 13% (2%~32.3%). The rate of osteolysis was approximately 18%. Residual pain was common (21.4%~46%), but overall patient satisfaction was approximately 85.6% (67.5%~97%). Conclusion: The results could be used as criteria for designing the clinical studies, such as number of cases, patient age (over 60 years), and follow-up period (minimum two years). The clinical scoring system and 36-item short form health survey (SF-36) was the most commonly used method for clinical evaluation for total ankle arthroplasty. In addition, the overall results, including failure rate, osteolysis rate, and patient satisfaction, could be used as a parameter of guidelines for premarket approval.

Hybrid TDOA 알고리즘 기반의 Airborne Emitter 위치탐지를 위한 Ground-Platform 센서의 위치 최적화

박진오,이우석,유병석,국찬호,정재우,Park, Jin-Oh,Lee, Woo-Seok,You, Byung-Sek,Kook, Chan-Ho,Chung, Jae-Woo 한국군사과학기술학회 2010 한국군사과학기술학회지 Vol.13 No.5

This paper considers the problem of time difference-of-arrival(TDOA) source localization when the TDOA and angle of arrival(AOA) measurements from an airborne emitter source are subject to ground-platform sensor position. The optimization of sensors' position is a challenging problem and a solution with good localization accuracy has yet to be found. This paper proposes an estimator that can achieve these purposes and provides optimized sensor position for good localization accuracy using the proposed estimator. The developed algorithm and sensor position are then examined under the special case of a single airborne source. The theoretical developments are supported by simulations.

LoRa LPWAN 무선 통신을 활용한 교량 유지관리 시스템 적용성 연구

박진오,박상헌,안승주,박원주,김종훈 한국구조물진단유지관리공학회 2019 한국구조물진단유지관리공학회지 Vol.23 No.2

Early labechiid stromatoporoids of the Yeongheung Formation (Middle Ordovician), Yeongwol Group, mideastern Korean Peninsula: Part I. Environmental distribution

박진오,홍종선,이정현,조석주,이동진 한국지질과학협의회 2017 Geosciences Journal Vol.21 No.3

This study examines depositional facies and environmental significance of early labechiid stromatoporoids in the Yeongheung Formation (late Middle Ordovician), Yeongwol Group in the mideastern part of the Korean Peninsula. The formation is composed of five depositional facies: lime mudstone to wackestone (LM/W), peloidal, intraclastic and bioclastic packstone to grainstone (P/G), laminated dolomitic lime mudstone (LMdl), algal laminite (La), and oolitic packstone to grainstone (P/Go). Three types of shallowing upward cycles in the succession are identified, including subtidal (LM/W–P/G), subtidal to peritidal (LM/W–P/G–LMdl–La), and peritidal cycles (LMdl–La). The stromatoporoids occur exclusively in the packstone to grainstone (P/G) facies of the subtidal cycle. These early labechiids inhabited on a grainy substrate under moderate- to high-energy conditions, conforming to the previous notion that stromatoporoids primarily occupied level-bottom or reefs, surrounded by grainy calcareous sediments during the Middle Ordovician.

A New Method for Transduction of Mesenchymal Stem Cells Using Mechanical Agitation

박진오,Sung-Hoon Park,홍성출 한국분자세포생물학회 2009 Molecules and cells Vol.28 No.6

Applications of bone marrow-derived mesenchymal stem cells in gene therapy have been hampered by the low effi-ciency of gene transfer to these cells. In current transduc-tion protocols, retrovirus particles with foreign genes make only limited contact with their target cells by passive diffusion and have short life spans, thereby limiting the chances of viral infection. We theorized that mechanically agitating the virus-containing cell suspensions would in-crease the movement of viruses and target cells, resulting in increase of contact between them. Application of our mechanical agitation for transduction process has in-creased the absorption of retrovirus particles more than five times compared to the previous static method without changing cell growth rate and viability. The addition of a mechanical agitation step increased transduction effi-ciency to 42%, higher than that of any other previously-known static transduction protocol.