최신 그라우팅 기술의 세계적인 동향에 관한 연구

김진춘(JinChun Kim),김상균(SangGyun Kim),유병선(ByungSun Yoo),강희진(HeeJin Kang) 한국방재안전학회 2014 한국방재안전학회 논문집 Vol.7 No.2

본 연구는 그라우팅 기술의 근간을 이루는 구성기술인 그라우팅 재료, 그라우팅 장비 그리고 시공관리기술에 대하여 각 요소별로 세계적인 기술동향을 조사 및 분석하여 상대적으로 열악한 국내 그라우팅 기술수준을 향상시키며 향후 해외시장 진 출시 갖추어야할 시방기준 등을 수립하기 위한 목적으로 수행하였다. 그라우팅 재료는 2000년대부터 일본에서는 고침투 및 고강도가 발현되는 극 초미립자 시멘트(1.5 μm)를 개발하고 있고 국내에서는 김진춘 등(2014)은 마이크로시멘트계열의 하이브리드형 그라우트재료를 개발하고 있다. 최신 그라우팅 장비개발의 동향을 파악하기 위해 해외국가별 혹은 프로젝트별 시방서를 우선 검토하였으며 시방서의 주요내용으로는 재료사양 그리고 믹서, 펌프, 교반기 혹은 팩커에 대한 요구스펙까지 상세하게 기술되어있어 해외프로젝트 수주를 위해서는 각 국에서 제시한 시방서의 기준을 만족하여야 한다. 그라우팅 시공 관리기술은 크게 1~4세대 기술까지 발전하고 있는데 최근에는 ICT와 그라우팅 기술을 융합하는 4세대 연구가 북유럽국가 (스웨덴, 노르웨이 및 핀란드), 일본 및 한국 등에서 활발하게 진행되고 있다. This study researches on global technology trend in each of composing technology, such as grouting material, grouting equipment, and construction management technology, which grouting technology has been founded upon to improve relatively inadequate domestic grouting technology and to establish the global standard for overseas expansion in the future. As far as grouting material is concerned, while High-Penetration and High-Strength micro cement (1.5 μm) has been developed in 2000’s in Japan, JinChun Kim et al. (2014) has been developing hybrid type micro cement grouting material and examining specifications of different kinds of projects and countries to analyze the trend of grouting equipment development. The specification contains detailed requisite specification for materials, mixers, pumps, agitators, and packers and it has to satisfy the standard of different countries to win global contracts. Grouting management technology can be divided into four different generations and Scandinavian countries, such as Sweden, Norway, and Finland, Japan, and South Korea are recently doing vigorous researches on the Fourth generation which merges grouting technology with ICT.

Establishment of a special pathogen free Chinese Wuzhishan Minipigs Colony

Jinchun Pan,Fangui Min,Xilong Wang,Ruiai Chen,Fengguo Wan,Yuechang Deng,Shuming Luo,Jiancong Ye 한국축산학회 2015 한국축산학회지 Vol.57 No.3

To meet the increasing demands of specific pathogen free (SPF) minipigs in biomedical researches, 8 pregnantChinese Wuzhishan minipigs (WZSP) sows with clear background were chosen to obtain SPF WZSP byhysterectomy. At 111 ± 2 days of the pregnancy, piglets were aseptically taken out from the sows and artificiallysuckled for 40 to 45 days in the positive isolators. Then, the piglets defined as F0 were transferred to barrierenvironment and fed with standard feeds. The original SPF colony was formed for breeding by selected pigletsfrom F0 group of 6–8 months old. Biological characteristics of SPF WZSP were collected and further compared tothose of conventional (CV) WZSP, including growth performance, reproductive performance, hematology and bloodbiochemistry, and major pathogens detection. As a result, 61 F0 piglets were obtained from 8 candidate sows, and55 out of them survived. After strictly selection, 35 F0 piglets were used to form the original SPF colony, whichproduced 14 litters of SPF piglets defined as F1. Piglet survival rates, growth performance, and reproductiveperformance of SPF WZSP were similar to CV WZSP. Some hematology and blood biochemistry parameters showedsignificant differences between SPF and CV WZSP. Eighteen kinds of pathogens were identified to be free in F0 andF1 SPF colony by repeated pathogen detections. In conclusion, we established a satisfied SPF WZSP colonymaintaining original characteristics, free of controlled diseases, and being proved to be a suitable laboratory animal

멀티 홉 UWSN 환경에서의 μTESLA 운영에 관한 고찰

최진춘(JinChun Choi),강전일(Jeonil Kang),양대헌(DaeHun Nyang),이경희(KyungHee Lee) 한국정보보호학회 2013 정보보호학회논문지 Vol.23 No.3

μTESLA는 WSN(Wireless Sensor Network)에서 대표적인 에너지 효율적 브로드캐스트 인증 방법이다. 지금까지 μTESLA의 문제점을 파악하고 이를 해결한 많은 연구들이 존재하지만, 그들 대부분은 자신들의 성능 입증을 위해 현실과는 거리가 먼 실험 환경에서 검증되었다. 우리는 현실에서 실제 WSN을 사용할 법한 실험 환경을 가정하고 이 바탕 위에서 μTESLA가 가진 실체적인 성능에 대해서 고찰해볼 필요가 있다고 생각하였다. 이 논문에서는 BS가 네트워크에 상주하지 않는 UWSN(Unattended WSN) 환경에서 동면과 활동을 반복하는 센서 노드들이 멀티홉으로 통신을 수행하는 경우를 가정하였다. 이러한 환경에서 우리는 다양한 모의실험을 통하여 μTESLA의 성능을 새로이 검증 및 분석하였다. μTESLA is well known as the most representative energy-efficient broadcast authentication method. Until now, there are many researches that figure out the problems or limitation of μTESLA and mitigate or solve them, but most researches have been verified in the environment far from the real world. We consider the necessity of verifying what the real efficiency of μTESLA is. In this paper, we assume that sensors that continuously repeat hibernation and activity perform communication under the UWSN(Unattended WSN), which BS does not stay in the network. In this environment, we newly inspect the performance of μTESLA by performing various simulations.

Establishment of a special pathogen free Chinese Wuzhishan Minipigs Colony

Pan, Jinchun,Min, Fangui,Wang, Xilong,Chen, Ruiai,Wang, Fengguo,Deng, Yuechang,Luo, Shuming,Ye, Jiancong Korean Society of Animal Science and Technology 2015 한국축산학회지 Vol.57 No.3

To meet the increasing demands of specific pathogen free (SPF) minipigs in biomedical researches, 8 pregnant Chinese Wuzhishan minipigs (WZSP) sows with clear background were chosen to obtain SPF WZSP by hysterectomy. At $111{\pm}days2$ of the pregnancy, piglets were aseptically taken out from the sows and artificially suckled for 40 to 45 days in the positive isolators. Then, the piglets defined as F0 were transferred to barrier environment and fed with standard feeds. The original SPF colony was formed for breeding by selected piglets from F0 group of 6-8 months old. Biological characteristics of SPF WZSP were collected and further compared to those of conventional (CV) WZSP, including growth performance, reproductive performance, hematology and blood biochemistry, and major pathogens detection. As a result, 61 F0 piglets were obtained from 8 candidate sows, and 55 out of them survived. After strictly selection, 35 F0 piglets were used to form the original SPF colony, which produced 14 litters of SPF piglets defined as F1. Piglet survival rates, growth performance, and reproductive performance of SPF WZSP were similar to CV WZSP. Some hematology and blood biochemistry parameters showed significant differences between SPF and CV WZSP. Eighteen kinds of pathogens were identified to be free in F0 and F1 SPF colony by repeated pathogen detections. In conclusion, we established a satisfied SPF WZSP colony maintaining original characteristics, free of controlled diseases, and being proved to be a suitable laboratory animal.

Initial Attitude Determination Using a Single Star Sensor

WANG, Jinchun,CHO, Sangwoo,CHUN, Joohwan 日本航空宇宙学会 2007 Transactions of the Japan Society for Aeronautical Vol.50 No.167

<P>An initial quaternion estimation method for the attitude determination of a spacecraft using an onboard star sensor is presented. In this method, we use a sequence of the number of stars in the field of view (FOV) of the star sensor as the measurement instead of the direction vector pairs of stars. A new statistical observation model is derived and coupled with the kinematics model of attitude to develop a cost function of the estimated initial quaternion. The attitude acquisition method proposed herein exploits generalized simulated annealing to optimize the cost function and find the initial quaternion. In addition, a virtual sub-FOV and its shuffling procedure for a more accurate estimation are presented. The performance of the proposed method is quantified using an extensive simulation.</P>

멀티 홉 Unattended WSN에서 가변 키 슬롯 기반 μTESLA의 운영

최진춘(JinChun Choi),강전일(Jeonil Kang),양대헌(DaeHun Nyang),이경희(KyungHee Lee) 한국통신학회 2014 韓國通信學會論文誌 Vol.39 No.3(융합기술)

1D deformation induced permeability and microstructural anisotropy of Ariake clays

Chai, Jinchun,Jia, Rui,Nie, Jixiang,Aiga, Kosuke,Negami, Takehito,Hino, Takenori Techno-Press 2015 Geomechanics & engineering Vol.8 No.1

The permeability behavior of Ariake clays has been investigated by constant rate of strain (CRS) consolidation tests with vertical or radial drainage. Three types of Ariake clays, namely undisturbed Ariake clay samples from the Saga plain, Japan (aged Ariake clay), clay deposit in shallow seabed of the Ariake Sea (young Ariake clay) and reconstituted Ariake clay samples using the soil sampled from the Saga plain, were tested. The test results indicate that the deduced permeability in the horizontal direction ($k_h$) is generally larger than that in the vertical direction ($k_v$). Under odometer condition, the permeability ratio ($k_h/k_v$) increases with the vertical strain. It is also found that the development of the permeability anisotropy is influenced by the inter-particle bonds and clay content of the sample. The aged Ariake clay has stronger initial inter-particle bonds than the young and reconstituted Ariake clays, resulting in slower increase of $k_h/k_v$ with the vertical strain. The young Ariake clay has higher clay content than the reconstituted Ariake clay, resulting in higher values of $k_h/k_v$. The microstructure of the samples before and after the consolidation test has been examined qualitatively by scanning electron microscopy (SEM) image and semi-quantitatively by mercury intrusion porosimetry (MIP) tests. The SEM images indicate that there are more cut edges of platy clay particles on a vertical plane (with respect to the deposition direction) and there are more faces of platy clay particles on a horizontal plane. This tendency increases with the increase of one-dimensional (1D) deformation. MIP test results show that using a sample with a larger vertical surface area has a larger cumulative intruded pore volume, i.e., mercury can be intruded into the sample more easily from the horizontal direction (vertical plane) under the same pressure. Therefore, the permeability anisotropy of Ariake clays is the result of the anisotropic microstructure of the clay samples.

유도결합 플라스마 분광분석법에 의한 순수금속 소재 중 미량원소 분석

우진춘(Jinchun Woo),한명섭(Myungsub Han),이광우(Kwangwoo Lee) 한국분석과학회 1990 분석과학 Vol.3 No.1

Study on Real-Time Scheduling Algorithms for Variable Bit Rates Traffic

Kim,Jinchun 경성대학교 1997 論文集 Vol.18 No.1

멀티미디어 데이터는 가변 비트 비율(VBR)을 가지는데 현존하는 실시간 스케쥴링 알고리즘은 고정 비트 비율(CBR)을 가정한 것이다. 주기적인 작업을 스케쥴링하는 알고리즘에서 Rate-Monotonic(RM) 알고리즘과 Earliest Deadline First(EDF) 알고리즘은 각각 전형적인 선취형과 비선취형 알고리즘이다. 이 두 알고리즘의 경우에 CBR작업은 스케쥴될 수 있다. 하지만 VBR작업은 많은 경우에 스케쥴되어질 수 없다. 본 논문에서 우리는 VBR작업에 대한 스케쥴링 가능성을 개선할 수 있는 스케쥴링 알고리즘에 대해 고찰하였다. 비선취형 알고리즘과 같이, 우리는 EDF보다 VBR작업을 더 잘 스케쥴할 수 있는 동적인 알고리즘을 제안한다. 선취형 알고리즘을 위해, 우리는 VBR과 제안한 relaxed RM의 경우에 대한 Rate Monotonic(RM)문제를 논의한다. 두 선취형과 비선취형 알고리즘에 대한 성능 평가가 주어진다. While the multimedia data have Variable Bit Rate(VBR), the existing real-time scheduling algorithms assume Constant Bit Rate(CBR)[1]. In the scheduling algorithms which schedule the periodic tasks, the Rate-Monotonic(RM) algorithm[5] and The Earliest Deadline First(EDF) are typical for preemptive and nonpreemptive scheduling algorithms respectively. For both algorithms, in case that the tasks with CBR can be scheduled, the tasks with VBR can not be scheduled many times. In this paper, we consider the scheduling algorithms which can improve the possibility for scheduling of the tasks with VBR. As a nonpreemptive algorithm, we present a dynamic algorithm[13] which can schedule the tasks with VBR better than EDF. For a preemptive algorithm, we discuss the problem of Rate Monotonic(RM) in case of VBR and propose the relaxed RM. The performance evaluations for both nonpreemptive and preemptive algorithms are given.

고수압 조건에서의 지반재해 저감을 위한 최신 그라우팅 시공관리 기술 기초연구

김진춘(JinChun Kim),유병선(ByungSun Yoo),강희진(HeeJin Kang),권영삼(YoungSam Kwon) 한국방재안전학회 2014 한국방재안전학회 논문집 Vol.7 No.1

고수압 시공 조건에서는 시설물 자체의 건설로 인하여 발생하는 주변지반의 이완 및 손상의 발생 그리고 시설물내로의 해수의 유입을 방지하기 위한 차수 및 지수설계 및 시공이 중요한 관건이다. 그라우팅 공사는 현재 지하철건설, 고속 철도건설, 각종 산악터널건설, 하천•저수지 재방 신설 및 보수공사 등에 년간 수조원 대의 시장규모를 형성하고 있지만, 설 계 및 시공관리에 대한 관리기준이 정밀하지 못하여 경험적인 판단에 의존하는 부분이 너무 많아 경제적 손실도 매우 클 것 이라고 쉽게 단정할 수 있다. 그라우팅 기술은 국가적 차원의 대규모 중요 건설공사 현장에서 필수적인 기술로 사용되고 있지만 기술에 대한 인식이 빈약하고 정립된 관리기준이 부재하여 신뢰성의 낙후가 심각한 실정이다. 따라서 본 연구는 고수 압 조건에서 지반재해 저감을 위한 최신 그라우팅 시공관리기술에 대한 기초 연구를 제공함이 그 목적이다. In the high water pressure construction conditions, it is important that the failures and damages occurrence in the neighboring ground and impermeable prevention methods (design and construction) for a inflow of seawater into structures. Grouting construction markets include a subway construction, a railway construction, a mountain tunnel construction, a new & reinforced construction of river & reservoir levee with big budget per every years. but, there are economic loss about design and construction management parts because that management criteria is not accurate but depends on experiences. Even though grouting technology are using vitally in the major constructions of national levels, it is still serious about the low-reliability problems and the no-criteria problems. therefor the purpose of this study is that provides the fundamental research about the neo-grouting technology for the decreasing of ground disaster in a high water pressure conditions.