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      • KCI등재

        조강형시멘트를 사용한 저온경화형 모르타르의 압축강도 및 유동특성에 미치는 방동제, 내한촉진제 및 감수제의 영향

        박정훈,기경국,이한승,김형철,최현국,민태범,Park, Jung-Hoon,Ki, Kyoung-Kuk,Lee, Han-Seung,Kim, Hyeong-Cheol,Choi, Hyun-Kuk,Min, Tae-Beom 한국건축시공학회 2016 한국건축시공학회지 Vol.15 No.4

        동절기에 콘크리트를 시공할 경우 초기동해와 강도발현이 지연되는 문제가 있으며, 이를 방지하기 위해서는 콘크리트가 동결하기 이전에 시멘트의 수화반응이 일정수준 이하 진행되는 것이 중요하다. 이에 본 연구는 조강형시멘트를 대상으로 내한성 혼화제를 사용한 저온환경하 콘크리트의 실무활용 가능성을 검토할 목적으로 보온 및 가열양생 없이 저온환경하 모르타르 조건에서 방동제, 감수제 및 내한촉진제의 종류별 사용에 따른 작업성 및 유지성능, 동결온도, 압축강도를 평가하였다. 실험결과 조강형시멘트와 방동제를 사용할 경우 CN 방동제 대비 SN 방동제가 초기 압축강도발현이 증진되었다. 또한, 0분 플로우가 증가하고 20분 플로우가 감소하였는데, FR, RT 감수제를 사용하여 플로우 지속성능이 다소 개선됨을 확인하였다. CF, LS 내한촉진제는 감수제의 종류와 상관없이 전반적으로 강도발현이 증진되었으나, SC 내한촉진제는 RT 감수제에서 강도발현이 미비한 것으로 나타났다. In order to examine the possibility of practical use of concrete at low-temperature environment using high early strength cement with cold resistance admixture, an experimental study on workability, freezing temperature and compressive strength of the mortar with different types of anti-freezer, water reducing agent and accelerator for freeze protection at low-temperature were evaluated. Compressive strength was increased in use of anti-freezer, especially SN anti-freezer was higher than CN anti-freezer. 0min flow was increased, the 20min flow was decreased. And 20min flow was improved in use of FR, RT water reducing agent. CF, LS accelerator for freeze protection, regardless of the type of water reducing agent, compressive strength was increased.

      • KCI등재

        Synthesis and Evaluation of F-18 Labeled Pyrido[3,2-B]pyrazine Derivative as a Potential Imaging Agent for Non-Small-Cell Lung Cancer

        박정훈,김희중,김동연,양승대,허민구,김상욱,유국현 대한화학회 2015 Bulletin of the Korean Chemical Society Vol.36 No.7

        Pyridopyrazine derivatives have been known as Wnt-2/β-catenin signaling pathway inhibitors. Wnt-2 overexpression may be involved in non-small-cell lung cancer (NSCLC). A novel 2-(4-[18F]fluorobutoxy)-3-(phenylethynyl)pyrido[3,2-b]pyrazine was prepared to demonstrate the feasibility of NSCLC imaging agent by uptake of Wnt-2 protein. It was synthesized with tosylated precursor using [ 18F]fluoride in radiochemical yield of 44–48%. In cellular uptake evaluation, H460 and H1299, Wnt-2 expressed cancer cell lines, showed 2.5-folds higher cellular uptake than that of MCF10A as a control.

      • KCI등재

        Health Risk Assessment through Residents Exposure to Toxic Metals in Soil and Groundwater in the Vicinity of Sanyang Metal Mine

        박정훈,최경균 한국환경농학회 2012 한국환경농학회지 Vol.31 No.2

        BACKGROUND: Metal mines were actively developed in the early twentieth century in Korea; however, most of these mines were closed and abandoned without proper management. Therefore, toxic metal contamination in the vicinity of Korean abandoned metal mines has been reported. A risk assessment for these metals was performed for residents near by abandoned Sanyang metal mine. METHODS AND RESULTS: Soil and groundwater samples were collected from May to October 2007 around the mine. After pretreatment of these samples, metal concentrations were measured and then a risk assessment was performed using the Korean soil-contamination risk assessment guidelines. Cancer risk was the highest from inhalation of Pb-contaminated soil, followed in descending order by As-contaminated soil inhalation and water ingestion. The sum of carcinogenic risks was 3.35×10-3. The noncarcinogenic risk was observed for inhalation of Hg-contaminated soil (5.71). CONCLUSION: Inhalation of soil in dust was the principal pathway to cause the health risk and most of the risk was attributed to As, Pb,Cd, and Hg contamination.

      • KCI등재

        토지이용계획의 수립․결정과정에서 주민참여절차의 의의와 과제

        박정훈 경희대학교 법학연구소 2016 경희법학 Vol.32 No.-

        최근 정부가 추진한 4대강정비계획․제주강정해군기지사건 등에서 보듯이 각종 토지개발계획이 환경문제나 지역생활권 침해 등을 이유로 한 관련주민들의 강한 반대가 사회적 이슈로 되었으며, 쟁송화되는 등 엄청난 국가사회적인 갈등비용을 지불하였다. 공공적 사업계획에 관한 격한 반대와 분쟁의 근저에는 계획의 수립결정과정에서 행정부의 입장과 이해관계인의 권리보호 및 시민상호간의 이해조정과정이 제대로 정립되어 있지 않다는 것이고, 이를 달리 말하면 그러한 원인에 대응할 수 있는 명확한 ‘행정계획절차’가 법제도적으로 부재하다는 것이다. 이 논문에서는 이러한 문제의식에 기초하여 토지이용계획과 관련하여 실정법을 토대로 전통적인 행정법이론에 의한 계획통제의 한계점을 논증하고, 토지이용계획에서 주민참여절차가 실질적으로 확립될 가능성의 모색과 향후 해결과제를 연구주제로 다루었다. 이 연구를 통해 분석․검토한 주민참여절차의 법리적 쟁점의 주요 내용은 다음과 같다. 우선은, 토지이용계획과 같이 행정계획은 계획의 전문성으로 인해 입법적 통제가 약화될 수밖에 없으며, 사법적 통제 역시 학설․판례에 의해 구속적 계획의 경우 광범한 ‘계획재량’을 인정하고 계획의 처분성을 긍정하는 전제에서 당해 계획의 실체적 위법판단기준으로 형량명령원칙을 채택한다는 사법심사법리가 확립되어 있으나, 아직까지 관련판례를 분석하면 구체적인 형량심사의 검토과정을 발견하기 어려우며, 재량남용법리와의 차이점도 명확하지 않는 등 여전히 계획재량통제는 한계가 있다. 여기서 계획법규를 실체법적 중심에서 절차법적으로 전환할 경우 입법․사법의 통제가 비교적 용이하며, 이는 결과적으로 행정부가 수립․결정하는 계획의 공공성을 담보하는 것으로 연결된다는 점이다. 그 다음으로, 이상과 같은 계획법의 구조적 이해에 따라 계획절차의 핵심인 주민참여절차와 관련하여 몇 가지 중요한 부분을 강조하면 첫째는, 이념적 측면에서 주민참여는 당해 계획지역의 토지소유자등의 권리이익보호와도 관계되나, 또한 지역주민의 생활권적 집단이익도 중요하므로 그 헌법적 근거는 적법절차(권리보호원리) 및 국민주권․주민자치원리(민주주의원리) 양면에 기초한다는 점에서 사전적인 권리보호절차로서 일반법인 행정절차법과 다르다는 점이다. 따라서 우리 계획법규의 주민참여절차의 해석․정비 등에 있어 이후에는 민주적인 사전절차로서 주민의 지위를 보장해가는 것이 중요하다. 둘째는, 현행 법제 속에서 주민참여절차에 관한 공청회․주민의견청취 등의 규율구조는 주민의견수렴에 미비하나, 헌법적 근거에 따른 권리보호와 민주주의의 실현과정으로 인식하고 계획수립권자는 현재의 참여제도만이라도 형식적으로 운용할 것이 아니라 각 절차를 청문회에 준하는 형식으로 실제적․실효적 제도로서 실시할 필요가 있다. 셋째는, 법원의 주민참여절차에 관한 법해석과 관련하여 지금까지 우리 법원이 보여주었듯이 절차형식보장기준에 의해 위법여부를 판단할 것이 아니라, 일본의 공청회․의견제출절차에 관한 판례에서 확인할 수 있듯이 주민참여의 본질과 실질에 충족하고 있는지 여부에 따라 계획절차의 위법여부를 판단하는 법원의 전향된 자세가 요구된다. 넷째는, 현 계획절차의 결점은 임의적․사실적 절차로서 각종 참여절차의 실시 ... The strong objection by related residents had been social issues: i.e., those issues are against various land development plan based on environmental problem or an invasion of local living rights, like recent governmental projects such as plan of maintenance of four rivers, Gangjung naval base in Jeju Island and etc. Furthermore, they had provoked lawsuits and they had costed gigantic national, social conflict. Violent objection and disputes against public plan of operation had been caused since there is no definite procedure of administrative plan in legal system to correspond to those causes: administration’s position, protection of right of interested persons and the process of interest mediation among citizen in the process of an establishment and decision of plan. Based on the critical mind the above, this thesis proves the critical point of plan control by traditional theory of administrative laws based on present laws related to land utilization plan and deals with a way to seek the possibility to practically establish the procedure of resident participation in the land utilization plan, and the subject of solution in the future. The ingredients of legal issues in the procedure of resident participation are the followings, analyzed and reviewed through this research. First of all, legislation control against administrative plan like land utilization plan must be weaken because of professionalism of plan.  Judicature control also has limitation. According to theory and case laws, in the case of binding plan, a theory of judiciary review to adopt a principle of an order to balance as substantial standard to judge illegality of concerned plan has been established on the assumption that the court acknowledges large planning discretion and it affirms the nature of disposal of plan. However, according to the analysis on the related case laws, there was no precess to review specific review of balance. Besides, the control of planning discretion still has limitation since there is no definite difference from the theory of abuse of discretion. Here, if laws on plan concentrated on substantial laws could be converted to it concentrated on procedural law, legislative, judicature control may be comparatively easy. As a result, it guarantees the nature of public of plan, established and decided by the Administration. Next, according to the structural understanding of planning laws the above, this thesis focuses on the several points related to the procedure of residents participation as the core of planning procedure. First, residents participation in the side of ideology is different from the ordinary administrative laws of procedure as the preliminary procedure to protect rights. It tied to protection of interest on the right of property owners around concerned planning area. However, group’s interest of a living right of residents is important. Thus, its constitutional ground based on both faces: due process (a theory of right protection) and a theory of national sovereignty and residents autonomy (a theory of democracy). Consequently, in the analysis and maintenance of the procedure of residents participation of planning laws, protecting the status of residents as democratic, preliminary procedure is important in the future. Second, as a structure to regulate a public hearing and hearing on the opinion of resident is not enough for reflection of resident’s opinion, the right owner to establish plan needs to execute the present system to participate not just as a formal system, but a practical, efficient system such as every procedure the same as public hearing. Third, like case laws related to legal analysis on the procedure of residents participation of the court, the court would not judge whether it is violation of laws by the standard to assure the form of procedure, but, like Japanese case laws on the public hearing and the procedure of the submission of the opinion, it may turn to judge whether it is violation ...

      • KCI등재

        Extraction of bitumen with sub- and supercritical water

        박정훈,Sou Hwan Son 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.2

        The sub- and supercritical water extractions of Athabasca oil sand bitumens were studied using a micro reactor. The experiments were carried out in the temperature range of 360-380 ℃, pressure 15-30 MPa and water density 0.07-0.65 g/cm^3 for 0-2 hrs. The extraction conversion of bitumens increased with solvent power and temperature. A maximum conversion of 24% was obtained after 90 min extraction at the supercritical condition. Hydrogen and carbon mono-oxide were not detected in sub-critical region but in the supercritical region. The supercritical condition was favorable to the hydrogen formation for bitumen extraction. The extraction products were upgraded relative to the original bitumens due to direct hydrolysis of low-energy linkage and H2 formed by water gas shift reaction in supercritical condition. 18% of initial sulfur in bitumen can be removed at maximum conversion condition. The asphaltene contents of the residue were significantly higher than that of original bitumen due to preferential extraction of aromatic compounds in supercritical condition.

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