레크리에이션 및 이벤트업 종사자의 이직의도에 영향을 미치는 작업환경 변수 탐색

민완식(Min, Wan-Sik),이옥진(Lee, Ok-Jin),김미예(Kim, Mi-Ye) 한국체육과학회 2012 한국체육과학회지 Vol.21 No.1

The purpose of this study was to examine the various variables influence on changing intention of employee in recreational and event job area, so as to extend the life span of the job by improving working environment. The data of 207 recreational and event job worker were collected in Seoul metropolitan area by using the structured and self-administered questionnaire. Collected data were computed descriptive statistics, and conducted the correlation and multiple regression analysis. In the result of descriptive statistics, the degree of intend to leave was 2.4 point overall in the score of 5 point Likert’s scale on the average, and the mean score of working environmental satisfaction was 3.6 point overall. The results of multiple regression analysis showed that inaptitude of the job was the most important factor for the intent to leave the job as well as external understanding. It is suggested that the characteristic of work should be informed before entering the job, and the individual aptitude and preference should be considered on the allocation of work. Also, the manager should make an effort to improve the understanding of outside.

갑상선유두상암의 중앙림프절 전이율에 따른 N1a병기의 세분화

이민완(Min Wan Lee),조진성(Jin Seong Cho),조동훈(Dong Hoon Cho),유영재(Young Jae Ryu),박민호(Min Ho Park),윤정한(Jung Han Yoon) 대한두경부종양학회 2016 대한두경부 종양학회지 Vol.32 No.1

Background : The 2015 American thyroid association (ATA) guidelines greatly expanded section on risk strat-ification of thyroid cancer. Definition of "Low risk of recurrence" has expanded, by inclusion of small volume lymph node involvement, such as less than 5 lymph node metastases each smaller than 2mm in central compartment. Purpose : We evaluated the number of positive nodes, Positive node ratio (PNR), recurrence, and radioablation therapy. Also, evaluated the safety of omitting strategy of radioablation after total thyroidectomy with PTC, espe-cially on low-PNR N1a patients compared with high-PNR N1a patients. Methods : Consecutive 147 N1a and 216 N0 patients who underwent total thyroidectomy with central neck dissection between 2003 and 2004 were enrolled. We divided 147 N1a patients into two groups, such as 96 high-PNR versus 51 low-PNR group according to 50% of PNR, and compared these two groups with N0 group. Results: 7.2% (26/363) recurrences were occurred, and 21/147 (14.3 %) recurrences were on N1a patients, and 5/216 (2.3 %) were on N0 patients. Of these 21 recurrences in N1a stage patients, 20 (95.2 %) recurrences were occurred in high-PNR N1a group and only 1 (4.8 %) recurrence was in low-PNR N1a group. The recurrence of low-PNR N1a group was significantly lower than high-PNR N1a group (Log-rank p value = 0.003), but sig-nificantly not different from N0 group (Log-rank p value = 0.889). Although this study was a retrospective non-randomized trial with small number of patients, the 10-year recurrence of omitting RAI in low-PNR N1a patients with less than 50% of PNR were shown to be comparable with 216 N0 low risk patients. Conclusion : Positive node ratio could be a useful predictor of recurrence and useful guidance postoperative management -rather than absolute number of positive node.

층층둥굴레(Polygonatum stenophyllum Maxim.)의 캘러스 유도 및 기내 식물체 분화

박민완,류시현,이윤영,송재모,김진호,안영희,배기화,Park, Min Wan,Ryu, Shi Hyun,Lee, Yoon Young,Song, Jae-Mo,Kim, Jin Ho,Ahn, Young-Hee,Bae, Kee Hwa 한국식물생명공학회 2018 식물생명공학회지 Vol.45 No.3

본 연구는 백합과에 속하며 환경부에서는 멸종위기종 리스트 중 관심종으로 분류된 층층둥굴레의 기내 증식에 미치는 연근별, 호르몬 종류와 농도별 배양환경을 조사하기 위해 수행되었다. 효과적인 캘러스 유도조건을 알아보고자 0.1, 0.5, 1.0, $1.5mg{\cdot}L^{-1}$의 2,4-D가 첨가된 MS배지에 1, 3, 5년생 층층 둥굴레 근경을 치상한 후에 캘러스 유도율을 조사한 결과, $0.5mg{\cdot}L^{-1}$ 2,4-D 배지에 2년생 근경 배양한 배지에서 87%의 캘러스 유도율을 보였다. 1년생 근경은 67%, 5년생 근경은 50%로 조사되었다. 층층둥굴레 캘러스 유래의 부정아 유도는 0.5 mg/L NAA 처리구에서 57%로 조사되었다. 호르몬이 첨가되지 않은 대조구에서는 부정아가 유도되지 않았다. 층층둥굴레 부정아의 신장과 발근에 적합한 호르몬의 종류와 농도를 조사하였다. 층층둥굴레 부정아 신장의 최적 조건은 $0.1mg{\cdot}L^{-1}$ BA 호르몬이 첨가된 배지이고 BA의 농도가 높아질수록 감소하는 경향을 보였다. 그리고 기내에서 무균적으로 온전한 개체를 생산하기 위해 shoot 부위가 신장된 부정아에서 발근에 적합한 배지를 조사하였다. 발근에 적합한 조건은 호르몬이 첨가되지 않은 대조구이며 뿌리의 길이는 11 cm로 조사되었다. 본 연구결과에서 층층둥굴레 연생별 근경, 옥신종류 및 농도에 따른 최적의 캘러스 유도조건을 조사하였고, 유도된 캘러스를 이용하여 분화에 최적조건을 조사하였다. 또한 발근에 필요한 최적의 조건을 조사하여 성공적인 기내배양을 통한 재분화 시스템을 확립하였다. 이러한 결과는 향후 층층둥굴레의 개체보전과 생물소재 활용을 위한 소재확보에 중요한 기초자료를 제공할 것으로 생각된다. A Polygonatum stenophyllum Maxim. is an important endangered plant belonging to the family Liliaceae. A method was developed for the rapid micropropagation of P. stenophyllum through plant regeneration from rhizome (1-year, 3-years, and 5-years) explant-derived calli. The rhizome segments were cultured in Murashige and Skoog (MS) medium supplemented with varying concentrations of 2,4-D (0, 0.5, 1.0, $1.5mg{\cdot}L^{-1}$) for callus induction. In media supplemented with $0.5mg{\cdot}L^{-1}$ of 2,4-D, 87% of 3-years rhizome produced callus. Subsequently, the callus was transferred to 1/2MS medium supplemented with various concentrations of IAA, IBA, NAA, and 2,4-D (0, 0.1, 0.5 and $1.0mg{\cdot}L^{-1}$) for adventitious shoot formation. The highest percentage of adventitious shoot induction (57%) was observed in 1/2MS medium containing $0.5mg{\cdot}L^{-1}$ of NAA. Elongation of the adventitious shoot was achieved in 1/2MS medium supplemented with $0.1mg{\cdot}L^{-1}$ of BA. Rooting was achieved in 1/2MS medium without any hormones. It is hypothesized that the stated in vitro propagation protocol will be useful for conservation and mass propagation of the endangered Polygonatum stenophyllum Maxim. for bioresources.

ZnS:Cu,Cl 형광체의 특성에 미치는 원자층 증착 초박막 HfO₂의 영향

김민완,한상도,김형수,김혁종,김휴석,김석환,이상우,최병호,Kim, Min-Wan,Han, Sand-Do,Kim, Hyung-Su,Kim, Hyug-Jong,Kim, Hyu-Suk,Kim, Suk-Whan,Lee, Sang-Woo,Choi, Byung-Ho 한국재료학회 2006 한국재료학회지 Vol.16 No.4

An investigation is reported on the coating of ZnS:Cu,Cl phosphors by $HfO_2$ using atomic layer deposition method. Hafnium oxide films were prepared at the chamber temperature of $280^{\circ}C$ using $Hf[N(CH_3)_2]_4\;and\;O_2$ as precursors and reactant gas, respectively. XPS and ICP-MS analysis showed the surface composition of coated phosphor powder was hafnium oxide. In FE-SEM analysis, the surface morphology of uncoated phosphors became smoother and clearer as the number of ALD cycle increased from 900 to 1800. The photoluminescence intensity for coated phosphors showed $7.3{\sim}13.4%$ higher than that of uncoated. The effect means that the reactive surface is uniformly coated with stable hafnium oxide to reduce the dead surface layer without change of bulk properties and also its absorptance is almost negligible due to ultrathin(nano-scaled) films. The growth rate is about $1.1{\AA}/cycle$.

원자층 증착법으로 성장한 HfO₂ 박막의 제조

김희철,김민완,김형수,김혁종,손우근,정봉교,김석환,이상우,최병호,Kim Hie-Chul,Kim Min-Wan,Kim Hyung-Su,Kim Hyug-Jong,Sohn Woo-Keun,Jeong Bong-Kyo,Kim Suk-Whan,Lee Sang-Woo,Choi Byung-Ho 한국재료학회 2005 한국재료학회지 Vol.15 No.4

The growth of hafnium oxide thin films by atomic layer deposition was investigated in the temperature range of $175-350^{\circ}C$ using $Hf[N(CH_3)_2]_4\;and\;O_2$ as precursors. A self-limiting growth of $0.6\AA/cycle$ was achieved at the substrate temperature of $240-280^{\circ}C$. The films were amorphous and very smooth (0.76-0.80 nm) as examined by X-ray diffractometer and atomic force microscopy, respectively. X-ray photoelectron spectroscopy analysis showed that the films grown at $300^{\circ}C$ was almost stoichiometric. Electrical measurements performed on $MoW/HfO_2$(20 nm)/Si MOS structures exhibited high dielectric constant$(\~17)$ and a remarkably low leakage current density of at an applied field of $1.5-6.2\times10^{-7}A/cm^2$ MV/cm, probably due to the stoichiometry of the films.

고농도로 도핑된 Bismuth 기반 어븀첨가 광섬유 증폭기의 이론적 모델링 기법에 관한 연구

신재현,정민완,이주한,Shin, Jae-Hyun,Jung, Min-Wan,Lee, Ju-Han 한국광학회 2010 한국광학회지 Vol.21 No.4

본 논문에서는 고농도로 도핑된 Bismuth 기반 어븀첨가 광섬유 증폭기의 이득 및 노이즈 특성을 정확히 예측하기 위하여 필요한 이론적 모델링 기법에 대한 연구를 수행 하였다. 고농도의 Erbium 이온이 첨가되었을 때 발생하는 Clustering 현상에 기인한 Inhomogeneous Broadening현상, Cooperative Upconversion 현상, Pump Excited State Absorption과 Signal Excited State Absorption 현상 등 모든 현상을 고려하여 6 레벨 증폭기 System Model을 제시하고 이를 전산모사하여 실험치와 비교함으로써 제시된 모델의 유효성을 검증하였다. A complete modeling of erbium-doped Bismuth-oxide fibers with a high doping concentration is presented. A 6-level amplifier system that incorporated clustering-induced concentration quenching, cooperative upconversion, pump excited state absorption (ESA), and signal ESA, was adopted for the modeling. The accuracy of the modeling was verified by comparing the calculated gain and noise figure with experimentally obtained ones.