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콘크리트용 순환 잔골재 품질인증에 대한 운영실태조사 품질시험 부적합 사례 고찰
전수민 한국폐기물자원순환학회 2022 한국폐기물자원순환학회지 Vol.39 No.4
The quality test pass rate for fine aggregate used for concrete among quality-certified recycled aggregates is relatively low. This paper examines the failure rate and items of follow-up inspection tests conducted over the past three years for recycled fine aggregate for concrete. In addition, if two out of three tests are suitable for the certification of recycled aggregates, certification is performed. Considering that other certification systems fail one out of every two tests, it is possible to assume that tertiary test opportunities have a negative effect on quality securing recycled aggregates. Therefore, this study analyzed whether there is a statistically significant difference between the follow-up inspection test results for the twice- and thrice-tested certifications. In conclusion, this study found that the tertiary test did not negatively affect the quality of the recycled fine aggregate for concrete. 없음
전수민,이덕희,김혜진 대한응급의학회 2023 대한응급의학회지 Vol.34 No.1
Objective: The Risk-Rescue Rating Scale (RRRS) is generally implemented to predict the lethality of suicide attempts, whereas the Acute Physiology and Chronic Health Evaluation II (APACHE-II) scoring system is applied as an accurate measure of the severity of patient condition of patients admitted to intensive care units (ICUs). Using the RRRS and APACHE-II scores, in this study, we aimed to investigate the factors related to ICU admissions of deliberate self-poisoning (DSP) patients admitted to emergency departments (EDs). Methods: The epidemiologic and psychologic factors, electronic medical records, and laboratory tests of DSP patients were prospectively collected and analyzed. We divided the patients into two groups, an ICU admission group and a non- ICU admission group. Results: This study included 387 patients, 333 (86.0%) of which were in the non-ICU group and 54 (14.0%) in the ICU admission group. Multivariate logistic analysis was conducted to independently associate the ICU admissions with RRRS (odds ratio [OR], 1.40; 95% confidence interval [CI], 1.27-1.55; P<0.01), APACHE-II scores (OR, 1.11; 95% CI, 1.03- 1.21; P=0.01), and amylase values (OR, 1.01; 95% CI, 1.00-1.01; P=0.02). A receiver operating characteristics (ROC) curve analysis of the decision for admission to the ICU yielded the following scores for RRRS and APACHE II—cutoff values of 39.5 and 8.5, sensitivity of 96% and 66.0%, specificity of 74.0% and 75.1%, and area under the ROC curve (AUC) values of 0.95 and 0.74, respectively (P<0.01). Conclusion: The RRRS and APACHE-II scores could be used to determine ICU admissions in DSP patients admitted to the ED.
캡슐화-탈수화-유리화에 의한 국화 품종 '화이트 엔디' 신초의 초저온 동결보존
전수민,김창길 경북대학교 농업생명과학대학 2014 Current Research on Agriculture and Life Sciences Vol.32 No.2
본 실험은 국화의 바이로이드 제거에 이용되는 초저온처리 시 국화 품종 'White ND'을 적합한 처리조건을 확립하기 위해 초저온처리의 단계별 요인을 실험하였다. 그 결과 생장점의 크기는 1 mm(엽원기 2~3매 포함)에서 높은 생존율과 신초 재생율을 나타내었고, vitirification 처리시 PVS3가 효과적이었으며, 처리 시간은 60분 처리 하였을 때 높은 생존율 및 정 상 신초 재생율을 보였다. 또한 vitrification을 위한 전처리 조건은 sucrose 농도를 88 mM 24시간, sucrose 0.3 M 16시간, sucrose 0.5 M 6시간, sucrose 0.7 M 3시간으로 처리하는 것이 초저온 처리 후 생존율 및 신초 재생율을 높이는데 효과적이었으며, 재생된 정상 식물체는 모본과 비교하여 ploidy level이 동일한 것으로 보아 식물체의 유전적 변이가 일어나지 않았다. This study investigated the effects of cryopreserving Chrysanthemum morifolium cv. 'White ND' shoot tips for eliminating viroids. As a result, smaller shoot tips (2-3 LP, 1mm) showed a better survival and regrowth than larger shoot tips (4-5 LP, 1.5mm). The most effective vitrification solution for survival and regrowth was PVS3, which induced a high survival rate after 60 minutes of incubation. For a high efficiency, the best pre-treatment condition for vitrification was incubation in 88 mM sucrose for 24 h, 0.3M sucrose for 16 h, 0.5 M sucrose for 6 h, and 0.7 M sucrose for 3 h, in a descending order. The ploidy levels were the same in the mother plants and following cryopreservation, which confirmed the absence of any gene mutation.
컨테이너 터미널에서의 AGV의 교착방지를 위한 주행영역 예약 표 작성방법
전수민,김갑환,Jeon, Su-Min,Kim, Kap-Hwan 한국시뮬레이션학회 2008 한국시뮬레이션학회 논문지 Vol.17 No.3
본 연구는 컨테이너 터미널에서 사용될 수 있는 교착방지를 위한 알고리즘 개발을 목표로 하였다. 기존의 교착방지 알고리즘은 많은 계산시간을 소요한다는 단점을 극복하기 위하여 본 연구에서는 하나의 경로에 대해서 예약스케줄을 작성하여 두고 반복적으로 사용하는 예약 스케줄 표 방식을 제안하였다. 시뮬레이션 실험 결과 예약 스케줄 표 방식은 그때그때의 주행경로에 대한 예약스케줄링을 위하여 계산시간이 필요 없기 때문에 AGV의 실시간 운영을 위하여 유용한 방식임을 알 수 있었다. Automated Guided Vehicles (AGVs) are important equipment in automated container terminals. To utilize AGVs for transporting containers from a position to another, the deadlock is a serious problem that must be solved before they are deployed to real operations. This study assumes that traveling area for AGVs are divided into a large number of grid-blocks and, as a method of traffic control, grid-blocks are reserved in advance during the travel of AGVs. The purposes of the reservation are to make the room between AGVs and to prevent deadlocks. Because the size of an AGV is much larger than the size of a grid-block on guide paths, this study assumes an AGV may occupy more than one grid-block at the same time. This study suggests a method for constructing a table of reservation schedules by using a simulation. A sensitivity analysis was conducted to evaluate the performance of the reservation method in this study.
Fabrication of Porous ZnO Nanorods with Nano-sized Pores and Their Properties
전수민,이동율,김진수,김종수,이주인,김민수,조민영,최현영,임광국,김건식,김형근,임재영 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.6
Porous ZnO nanorods were fabricated by using an annealing process at 300, 500, and 700 ℃ for 20 min in an argon atmosphere. The structural and the optical properties of the porous ZnO nanorods were characterized by using X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), and photoluminescence (PL). The pore density of the porous ZnO nanorods decreased and the average diameter of the pores increased with increasing annealing temperature. The intensity of the ZnO (002) diffraction peak for the porous ZnO nanorods was stronger than that of the as-grown ZnO nanorod. The PL intensity ratio of the near-band-edge emission (NBE) to the deep-level emission (DLE) of the porous ZnO nanorods was larger than that of the as-grown ZnO nanorods. In addition, as the average diameter of the pores increased, the PL intensity ratio of the porous ZnO nanorods gradually increased.
수열합성법으로 성장된 산화아연 나노막대의 특성 및 열처리 효과
전수민,김민수,김군식,조민영,최현영,임광국,김형근,이동율,김진수,김종수,이주인,임재영,Jeon, Su-Min,Kim, Min-Su,Kim, Ghun-Sik,Cho, Min-Young,Choi, Hyun-Young,Yim, Kwang-Gug,Kim, Hyeoung-Geun,Lee, Dong-Yul,Kim, Jin-Soo,Kim, Jong-Su,Lee, Joo 한국진공학회 2010 Applied Science and Convergence Technology Vol.19 No.4
수열합성법으로 실리콘 (111) 기판 위에 산화아연 나노막대를 성장하였다. 산화아연 나노막대를 성장하기 전, 실리콘 기판에 스핀코팅법으로 씨앗층을 성장하였다. 산화아연 나노막대는 오토클레이브(autoclave)로 $140^{\circ}C$에서 6시간 동안 성장하였고, 아르곤 분위기에서 300, 500, $700^{\circ}C$의 온도로 20분 동안 열처리하였다. X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), photoluminescence (PL)를 이용하여 열처리한 산화아연 나노막대의 구조적, 광학적 특성을 분석하였다. 모든 산화아연 나노막대 시료에서 c-축 배향성을 나타내는 강한 ZnO (002) 회절 피크와 약한 ZnO (004) 회절 피크가 나타났다. 열처리 온도가 증가함에 따라 산화아연 나노로드의 residual stress는 compressive에서 tensile로 변하였다. Hexagonal 형태의 산화아연 나노로드를 관찰하였다. 산화아연 나노로드의 PL 스펙트럼은 free-exciton recombination에 의해 3.2 eV에서 좁은 near-band-edge emission (NBE) 피크와 산화아연 나노막대의 결함에 의해 2.12~1.96 eV에서 넓은 deep-level emission (DLE) 피크가 나타났다. 산화아연 나노막대를 열처리함에 따라, NBE 피크의 세기는 감소하였고 DLE 피크는 열처리에 의해 발생한 산소 관련 결함에 의하여 적색편이 하였다. Vertically aligned ZnO nanorods on Si (111) substrate were prepared by hydrothermal method. The ZnO nanorods on spin-coated seed layer were synthesized at $140^{\circ}C$ for 6 hours in autoclave and were thermally annealed in argon atmosphere for 20 minutes at temperature of 300, 500, $700^{\circ}C$. The effects of the thermal annealing on the structural and optical properties of the grown on ZnO nanorods were investigated by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), photoluminescence (PL). All the ZnO nanorods show a strong ZnO (002) and weak (004) diffraction peak, indicating c-axis preferred orientation. The residual stress of the ZnO nanorods is changed from compressive to tensile by increasing annealing temperature. The hexagonal shaped ZnO nanorods are observed. The PL spectra of the ZnO nanorods show a sharp near-band-edge emission (NBE) at 3.2 eV, which is generated by the free-exciton recombination and a broad deep-level emission (DLE) at about 2.12~1.96 eV, which is caused by the defects in the ZnO nanorods. The intensity of the NBE peak is decreased and the DLE peak is red-shifted due to oxygen-related defects by thermal annealing.