• Title/Summary/Keyword: Kim Se Yeon

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Molybdenum 후면전극을 통한 CIGS우선배향성의 제어 및 변환효율에 미치는 영향

  • Yun, Ju-Heon;Kim, Jong-Geun;Yun, Gwan-Hui;Park, Jong-Geuk;Kim, Won-Mok;Baek, Yeong-Jun;Seong, Tae-Yeon;Jeong, Jeung-Hyeon
    • Proceedings of the Korean Vacuum Society Conference
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    • 2011.02a
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    • pp.368-368
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    • 2011
  • 최근에 보고된 양질의 고효율Cu(In,Ga)Se2 (CIGS) 태양전지는 CIGS광흡수층이 강한 (220:204) 우선배향성을 갖는 것으로 알려져 있다 [1]. 이러한 CIGS우선배향성은 Se 증착압력, Na농도, 기판온도 및 Mo후면전극의 표면상태에 영향을 받는 것으로 알려져 있지만 정확한 상호관계는 아직 명확히 알려져 있지 않으며, 특히 Mo후면전극의 영향에 대해서는 체계적인 연구결과조차 극히 드문 상황이다 [2]. 본 연구에서는 CIGS 박막의 우선배향성에 대해 Mo후면전극의 미세구조가 미치는 영향 및 이에 따른 cell특성의 변화에 대해서 연구하였다. Mo후면전극의 미세구조는 2 mTorr~16 mTorr까지 증착압력을 변화시켜 제어되었고, CIGS광흡수층은 이렇게 준비된 Mo후면전극상에 3단계 동시증밥법(3-stage process)을 사용하여 형성하였다. XRD를 통한 박막의 우선배향성 평가에서, Mo 증착압력에 대한 IGS I(300)/I(006) 및 CIGS I(220:204)/I(112)의 거동은 Mo 미세구조와 밀접한 관련이 있는 잔류응력(residual stress)의 변화 거동과 상당히 일치함을 보였다. 이에 반해, 높은 압력의 Mo위에 형성된 강한 (220:204) 우선배향성의 CIGS와 bare-glass위에서 형성된 강한 (112) 우선배향성의 CIGS내 Na농도는 서로 유사하였다. 상기의 결과는 Mo미세구조 그 자체가 CIGS 박막 우선배향성의 원인이 됨을 나타낸다. Selenized Mo시편의 XRD분석 및 IGS/Mo 시편의 TEM분석결과을 통해 MoSe2의 반응성이 잔류응력과 비례하는 Mo in-gain 밀도에 의존하는 함을 알 수 있었고, 이러한 MoSe2반응성(reactivity)과 IGS우선배향성 사이에 상당히 밀접한 관련이 있으며 이에 CIGS의 우선배향성이 결정됨을 확인하였다. 마지막으로, Mo변수에 의해 제작된 cell의 특성분석으로부터 cell의 효율이 주로 VOC의 증가에 기인하여 CIGS (220:204) 우선배향성의 정도에 비례하였다.

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The Effect of Surface Defects on the Optical Properties of ZnSe:Eu Quantum Dots (ZnSe:Eu 양자점의 표면결함이 광학특성에 미치는 영향)

  • Jeong, Da-Woon;Park, Ji Young;Seo, Han Wook;Lim, Kyoung-Mook;Seong, Tae-Yeon;Kim, Bum Sung
    • Journal of Powder Materials
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    • v.23 no.5
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    • pp.348-352
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    • 2016
  • Quantum dots (QDs) are capable of controlling the typical emission and absorption wavelengths because of the bandgap widening effect of nanometer-sized particles. These phosphor particles have been used in optical devices, photovoltaic devices, advanced display devices, and several biomedical complexes. In this study, we synthesize ZnSe QDs with controlled surface defects by a heating-up method. The optical properties of the synthesized particles are analyzed using UV-visible and photoluminescence (PL) measurements. Calculations indicate nearly monodisperse particles with a size of about 5.1 nm at $260^{\circ}C$ (full width at half maximum = 27.7 nm). Furthermore, the study results confirm that successful doping is achieved by adding $Eu^{3+}$ preparing the growth phase of the ZnSe:Eu QDs when heating-up method. Further, we investigate the correlation between the surface defects and the luminescent properties of the QDs.

Two Clinical Cases on Patients with Pain And Limited Range of Motion about Shoulder Subsequent to Scapular Fracture By Oriental Medical Treatments And Chuna Treatment (견갑골 골절 후 견관절 통증 및 관절가동범위 제한을 동반한 환자에 추나와 한방 치료를 시행한 치험 2례)

  • Lee, Kyung-Moo;Lim, Sang-Hoon;Yoon, Dae-Yeon;Kim, Soon-Joong;Jeong, Su-Hyeon
    • The Journal of Churna Manual Medicine for Spine and Nerves
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    • v.4 no.2
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    • pp.99-107
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    • 2009
  • Objectives : This study was performed to evaluate the effects of oriental medical treatments and Chuna treatment on patients with pain and limited range of motion(LOM) about shoulder subsequent to scapular fracture. Methods : Two patients suffered from pain and LOM about shoulder after scapular fracture, one is scapular body fracture with multiple rib fractures, the other is only intraglenoid fracture were treated with Chuna therapy, acupuncture, herbal medicine, physical therapy and measured by VNRS(Verbal numerical rating scale) and ROM (Range of motion). Results : After oriental medical treatments and Chuna treatment, we found out a recovery from two patients suffered from pain and LOM about shoulder subsequent to scapular fracture. Conclusions : Through this study, we suggest that oriental medical treatments and Chuna treatment were effective to cure patients with pain and LOM subsequent to scapular fracture.

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A Comparative Study between Urban and Rural Area Stroke Patients Admitted to Korean Medical Hospitals (한방병원에 입원한 도심지와 농촌지역 중풍 환자 비교 연구)

  • Ko, Seung-woo;Kim, Young-ji;Kong, Kyung-hwan;Sung, Hyun-kyung;Lee, Ju-ah;Choi, Ji-ae;Ha, Ye-jin;Go, Ho-yeon
    • The Journal of Internal Korean Medicine
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    • v.37 no.1
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    • pp.1-7
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    • 2016
  • Objectives: This study aimed to investigate the sociodemographic factors of stroke patients.Methods: Patients were hospitalized at Korean medical hospitals with cerebral hemorrhage and infarction and then discharged between September 2013 and August 2014. We investigated the patients’ general character and risk factors, then the patients were classified according to the regions where they reside.Results: The results indicated that having hypertension and diabetes mellitus as an underlying disease was more common in stroke patients from the country. No other statistical significance was noted among the indexes of any other results.Conclusions: Based on these results, hypertension, and diabetes mellitus were more important risk factors in patients from the country than they were for city residents. Further large-scale studies are needed to generalize the findings of this study.

Korean Medicine Interventions for Benign Paroxysmal Positional Vertigo: A Systematic Review of Clinical Studies Published in Korea (양성 돌발성 체위성 현훈(Benign Paroxysmal Positional Vertigo)에 관한 임상 문헌 고찰 - 국내에 출판된 한의약 임상 논문을 중심으로 -)

  • Jung, Jun-su;Jung, Sung-heon;Kim, Min-joo;Park, Jang-kyung;Bae, Kwang-ho;Kong, Kyung-hwan;Ko, Ho-yeon
    • The Journal of Internal Korean Medicine
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    • v.38 no.4
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    • pp.479-490
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    • 2017
  • Objectives: This study provides evidence for clinical practices by analyzing present clinical Korean medicine articles about benign paroxysmal positional vertigo (BPPV). Methods: Articles published up to July, 2017 were found by searching "BPPV", "Benign positions", and "Vertigo" as keywords in three domestic electric databases (i.e., OASIS, NDSL, RISS). Results: The initial search resulted in 228 articles; however, only 20 articles satisfied the selection criteria and were analyzed. Of these, 40% were published in the Journal of Korean Oriental Internal Medicine, and 35% were published in 2003. When diagnosing BPPV patients, VAS scores are primarily used for clinical assessments rather than objective diagnostic tools. Banhabaekchulcheonmatang was the most frequent herbal medicine used to treat BPPV, and the most commonly used therapeutic acupuncture point was Jok-samni (ST36). The most common diagnosis of BPPV was dam-eum according to nine studies. Conclusions: Systematic and large-scale research for the standardization of BPPV treatment is needed.

A Study on Urinary Incontinence Clinic Operated by Local Public Health Center (일개 보건소의 요실금 치료 교실 운영 결과에 대한 고찰)

  • Yu, Sung-Jin;Jung, Jae-Hoon;Kim, Na-Young;Shin, Mi-Ran;Ko, Ho-Yeon;Lee, Dong-Nyung
    • The Journal of Korean Obstetrics and Gynecology
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    • v.23 no.3
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    • pp.112-122
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    • 2010
  • Purpose: Today, the proportion of the elderly is increasing especially in a province. For elder people, local government has conducted the health promotion act by oriental medicine. For oriental medicine hub health promotion act, Eumseong -gun carried out a program that is urinary incontinence clinic for the elderly. The purpose of this study is to show how effective the public health promotion program using oriental medicine is. Methods: The 42 patients had been treated for urinary incontinence during the 10 or 11 weeks. They were put on oriental medical treatment in the Eumseong-gun public health center. Results: 1. There was significant decreases in the degree of urinary incontinence after the treatment. 2. The treatment made the patients regain their mental security. 3. People who were treated by public health promotion program were the most satisfied. Conclusion: The results suggested that public health promotion program using oriental medicine is effective for urinary incontinence.

Evaluation of Dietary Zinc, Copper, Manganese and Selenium Intake in Female University Students (여대생의 아연, 구리, 망간, 셀레늄 섭취 상태 평가)

  • Bae, Yun-Jung;Kim, Mi-Hyun;Yeon, Jee-Young
    • Korean Journal of Community Nutrition
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    • v.17 no.2
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    • pp.146-155
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    • 2012
  • This study aimed to measure and evaluate the intakes of four antioxidant trace elements, namely, Zn, Cu, Mn, and Se in 19-29y-old female university students in Korea. Diet data were collected by 3-day dietary records in 644 subjects. The mean age, height, weight and body mass index of the subjects were 20.08 years, 161.77 cm, 54.26 kg and $20.82kg/m^2$, respectively. The mean, median and 25th-75th percentile intakes of Zn, Cu, Mn, and Se in the subjects were 12.83 mg (12.40 mg, 9.59 to 15.34), 1.30 mg (1.27 mg, 1.00 to 1.57), 3.19 mg (3.12 mg, 2.45 to 3.86), and $50.90{\mu}g$ ($50.17{\mu}g$, 37.59 to 64.35), respectively. The proportion of subjects whose Mn intake was adequate or less was 62.89%, and the proportions of subjects whose Zn, Cu and Se intakes were at the estimated average requirements or less were 10.09, 4.97, and 39.60%, respectively. The major food group for dietary intakes of Zn, Cu, Mn, and Se was cereal, providing 8.55 mg (66.60%), 0.78 mg (59.93%), 2.09 mg (65.50%), and $16.83{\mu}g$ (32.43%), respectively. Many female university students were deficient in Mn and Se compared with the dietary reference intakes. Therefore, except for cereal, it is required to consume a diet consisted of various food sources for increasing the intakes of antioxidant trace minerals, especially animal food groups.

Influencing Factors on Intention to Vaccinate Against COVID-19 in College Students

  • Lee, Se Hyun;Park, Seo Rin;Kim, Hye Min;Ko, Da Yeon;Kang, Min Seong;Choi, Eun Chae;Shin, Da Som;Kim, Se Yeon;Seo, Eun Ji
    • Journal of Korean Biological Nursing Science
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    • v.23 no.4
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    • pp.330-338
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    • 2021
  • Purpose: This cross-sectional study aimed to identify factors affecting coronavirus disease 2019 (COVID-19) vaccination intention. Methods: For an anonymous online survey, recruitment notices were posted on an anonymous community by each university, and an online survey was conducted through online form from June to July 2021. COVID-19 knowledge and health-protective behavior were measured using a questionnaire based on previous literature and reflecting the Korea Centers for Disease Control and Prevention's COVID-19 Response Guidelines. The psychological antecedents of vaccination were measured by 5C scale. Results: Two-hundred and ninety-four college students (women 67.3%) answered the survey; 179 (60.9%) reported that they would accept a COVID-19 vaccine. The mean scores for COVID-19 knowledge and health-protective behavior were 22.97±5.33 (out of 35) and 9.92±2.22 (out of 12), respectively. For the psychological antecedents of vaccination, the mean scores for confidence, collective responsibility, calculation, complacency, and constraints were 4.45 (± 1.24), 5.61 (± 1.09), 5.09 (± 1.18), 2.42 (± 1.11), and 2.37 (± 1.19) out of 5 points, respectively. The confidence, calculation, and collective responsibility were associated with vaccination intention. Additionally, the top reason for those who were less prone to accept vaccination against COVID-19 was concern about vaccine safety. Conclusion: The higher the confidence in the vaccine and the higher the collective responsibility, the higher the vaccination intention. As it is a factor related to an individual's perception of COVID-19 information, it is necessary to increase confidence in the vaccines through obtaining accurate information on the safety, effectiveness, and side effects of the COVID-19 vaccines and vaccination.

First report of tetracycline-resistant Aeromonas veronii infection in Amur catfish (Silurus asotus) cultured in Korea

  • Kim, Hyo Yeon;Jun, Jin Woo;Lim, Se Ra;Park, Seon Young;Han, Jee Eun;Park, Se Chang;Kim, Ji Hyung
    • Korean Journal of Veterinary Research
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    • v.59 no.4
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    • pp.207-211
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    • 2019
  • Mass mortality in commercially cultured Amur catfish (Silurus asotus), showing symptoms of dermal ulcerations, occurred on a private farm in Mar 2019 in Korea. β-hemolytic bacteria were isolated from the ulcers and kidneys of the fish and identified as Aeromonas veronii. The isolate was resistant to tetracycline and possessed cytotoxic heat-labile enterotoxin (aerolysin/hemolysin). We investigated the genetic determinants associated with tetracycline resistance, and the isolate has been confirmed to simultaneously possess tetA and tetE genes. This is the first report on the occurrence of tetracycline-resistant A. veronii infection related to mass mortality in commercially cultured Amur catfish in Korea.

Optical characterization of doped ZnO thin films

  • Kim, Jin-Su;Jo, Seong-Hun;Seong, Tae-Yeon;Kim, Won-Mok
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2008.06a
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    • pp.426-426
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    • 2008
  • ZnO 박막과 Al이 도핑된 ZnO 다결정질 박막을 rf magnetron sputtering 방법을 이용하여 Si(100) 기판과 코닝글라스 기판에 증착하여 박막의 광학적 특성을 Spectro-scopic Ellipsometry (SE, Woollam사)와 UV-VIR-NIR Sphectrophotometry (SP, Varian사)를 사용하여 분석하였다. SE 측정은 입사각도 55도에서 75도까지 5도 간격으로 파장범위 250 - 1700 nm 에서 3 nm 간격으로 측정하였으며, SP 측정은 수직입사로 250-3000 nm 파장범위에서 1 nm 간격으로 투과도와 반사도를 측정하였다. 측정된 데이터들은 Lorentz Oscillator 모델과 Drude free electron 모델이 결합된 분산관계식을 사용하여 전산 맞춤을 하여 분석하였다. ZnO 박막의 optical band gap energy 는 3.3 eV로 측정되었으며, Al 도핑에 따른 자유전하농도가 증가에 의하여 Burstein-Moss 효과에 따르는 optical band gap energy의 증가 거동을 보였다. 또한 자유전하농도 증가에 따라 band edge 부근에서 나타나는 excitonic transition 에 기인하는 유전함수 피크의 broadening이 관찰되었으며, high frequency dielectric constant는 자유 전하농도에 관계없이 3.689${\pm}$0.05 eV 의 값을 가졌다. Drude free electron 모델을 사용하여 plasma frequency를 구하고 이로부터 얻어진 optical mobility 와 Hall mobility를 비교하여 ZnO계 다결정질 박막에서의 결정립계가 이동도에 미치는 영향을 고찰하고자 한다.

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