• Parasites, Hosts and Diseases
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• v.47 no.1
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• pp.1-5
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• 2009

A mathematical model for transmission of schistosomes is useful to predict effects of various control measures on suppression of these parasites. This review focuses on epidemiological and environmental factors in Schistosoma japonicum and Schistosoma mekongi infections and recent advances in mathematical models of Schistosoma transmission.

• Journal of Plant Biology
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• v.14 no.3
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• pp.47-59
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• 1971

As a continuation of part I, this paper deals with the classification of phytoplankton species collected from Chawol-do, Soya-do Pung-do of Kyonggi-Bay. One hundred and fortythree kinds of photoplankton from this area were identified and classified by Engler's system into 17 families, 47 genera, 129 species, 10 varieties and 4 forms, blonging to 2 phyla, 3 classes, 3 subclasses, 8 orders and 1 suborder. 3 families, 7 genera, 10 species, 3 varieties and 3 forms are added. To the list published in part I. Seven species and one form described in this paper are new to Korea.

• Food Science and Industry
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• v.47 no.2
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• pp.3-12
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• 2014

• Journal of the Korea Institute of Information Security & Cryptology
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• v.8 no.2
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• pp.47-66
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• 1998

CALS체제의 구축에 있어 역기능으로 인한 여러 가지 문제가 대두되고 있다. 본 논문에서는 CALS정보보호 위협 요소를 비롯한 정보보호 서비스와 메커니즘을 분석하고 CALS를 안전하게 구축하기 위한 정보보호 모델과 시뮬레이션 단계를 예시하였다. CALS체제의 위협 요소, 보안 목적, 구현 자정요소, 지원 보안 메커니즘을 설정하여 제안된 CALS정보보호 모델은 4개의 서브 모델인 전송모델, 키관리 모델, 감사 모델, 통합 데이터 베이스 연계 모델로 수성하였으며 구현을 위한 모듈로 보안관리부, 디렉토리 서비스 에이전트와 인증국을 포함하는 키관리부, 분산 환경에서의 보안 감사부, 통합 데이터베이스 관리부로 나누어 제시하였다.

• Clinical and Experimental Pediatrics
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• v.59 no.sup1
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• pp.92-95
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• 2016

Neuroblastomas are sometimes associated with abnormal constitutional karyotypes, but the XYY karyotype has been rarely described in neuroblastomas. Here, we report a case of an esthesioneuroblastoma in a boy with a 47, XYY karyotype. A 6-year-old boy was admitted to our hospital because of nasal obstruction and palpable cervical lymph node, which he first noticed several days previously. A polypoid mass in the right nasal cavity was detected through sinuscopy. Biopsy of the right nasal polyp was performed. Based on the result, the patient was diagnosed with a high-grade esthesioneuroblastoma. Nuclear imaging revealed increased uptake in both the right posterior nasal cavity and the right cervical IB-II space, suggesting metastatic lymph nodes. Cytogenetic analysis revealed a 47, XYY karyotype. Twelve courses of concurrent chemotherapy were administered. Three years after the completion of chemotherapy, the patient had had no disease recurrence. He manifested behavioral violence and temper tantrums, so we started methylphenidate for correction of the behavior.

• Journal of Korean Public Health Nursing
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• v.35 no.1
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• pp.47-59
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• 2021

Purpose: To assess levels of mental health among community health practitioners during the COVID-19 outbreak in Korea and associations between practitioner mental health and personal and psychosocial factors. Methods: Data were collected from a convenient sample of 275 community health practitioners using an online questionnaire, which included items on mental health (K-WEMWBS), psychosocial factors (COVID-19 sensitivity, COVID-19 self-confidence, social support, perceived stress), and personal characteristics. Collected data were analyzed using the t-test, one-way ANOVA, Scheffe's test, Pearson's correlation coefficients, and multiple linear regression in SPSS 25.0. Results: Mean mental health score was 51.27±8.47. Multiple linear regression revealed that time spent as a community health practitioner, COVID-19 self-confidence, social support, and perceived stress were significantly associated with mental health. Conclusion: The findings of this study suggest that comprehensive intervention with emphases on improving COVID-19 self-confidence, social support, and reducing stress is required to improve community health practitioner mental health. The results also indicate a need for educational programs aimed at improving the mental health of young community health practitioners.

• Journal of Environmental Health Sciences
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• v.29 no.1
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• pp.1-7
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• 2003

This study was carried out to investigate the airborne microbial pollution in hospital environment. Using a mechanical air sampler, microbiological samples were taken from intensive care unit, general ward room, patients wailing room and outdoor of 20 hospitals in Seoul, Korea. The concentration of airborne bacteria and fungi ranged 97-410 cfu/㎥ and 37-77 cfu/㎥, respectively and patients waiting room had highest bacterial count. 10 genera of molds were identified and the most frequently recovered molds were Aspergillus, followed by Penicillium, Alternaria and Cladosporium. Among Staphylococcus species, S. haemolyticus and S. epidermidis were predominant and 47% of Staphylococcus species were isolated from intensive rare unit.

• Applied Microscopy
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• v.47 no.1
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• pp.36-42
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• 2017

Field electron emission measurements were performed on dielectric-coated tungsten emitters, with apex radii in the nanometer and micrometer range, which were prepared by electrochemical etching in NaOH solution. Measurements were performed in a field electron microscopy (FEM) with a base pressure <$10^{-6}$ Pascal ($10^{-8}$ mbar). Four different types of dielectric were used, namely: (1) Clark Electromedical Instruments epoxylite resin, (2) Epidian 6 produced by Ciech Sarzyna S. A., (3) a Radionox solution of colloidal graphite; and (4) Molyslip 2001 E compound ($MoS_2$ and MoS). Current-voltage measurements and FEM images were used to investigate the characteristics of these composite emitters, and to assess how the different types of dielectric coating affect the suitability of the composite emitter as a potential electron source.

• Journal of Families and Better Life
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• v.35 no.2
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• pp.47-61
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• 2017

The purpose of this study was to examine the influences of mothers' beliefs, guidance, and use of resources for writing on young children's writing ability. A total of 450 children aged 3 to 5 years and their mothers from 6 different provinces participated in this study. The results of this study are as follows. First, mothers conducted more writing guidance to older children. And their beliefs and use of resources for conventional writing were reinforced as children got older. There was no difference in mothers' beliefs and use of resources for emergent writing according to children's age. Second, mothers' beliefs, guidance, and use of resources for children's writing were robustly correlated. These correlations were prominent in each factor of emergent or conventional writing. Third, mothers' writing guidance and use of emergent writing resources had positive effects on children's writing ability, while the use of conventional writing resources had a negative impact.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2018.06a
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• pp.47-47
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• 2018

단일벽 탄소나노튜브 (Single-walled carbon nanotubes, SWNTs)는 우수한 물리적 화학적 특성을 갖고 있어 나노전자소자, 투명전도막, 에너지소자, 센서 등 다양한 분야로의 응용이 기대되고 있다. 열화학기상증착(Thermal chemical vapor deposition, TCVD)법은 SWNTs의 합성 공정이 간단하고 공정변수의 제어가 용이하다는 장점이 있어 SWNT 합성 연구에 가장 널리 사용되어 왔다. 일반적으로 금속 촉매의 박막이 증착된 합성 기판은 온도가 가장 높고 비교적 균일성이 보장되는 TCVD 반응기의 중심부에 위치시키고 공정변수를 변화해가며 연구를 진행해 왔다. 본 실험실에서는 수평형 반응기 전역에 합성 기판을 설치하여 SWNTs를 합성한 결과, 반응기의 중심보다 뒤의 영역에서 SWNTs의 합성 수율이 상당히 증가하는 것을 초기실험을 통해 확인하였다. 본 연구에서는 SWNTs 합성 시 가스 유량과 합성 온도를 변화시켰을 때 기판 위치에 따른 SWNTs의 수율 및 물성변화를 구체적으로 조사하였다. 합성가스와 촉매로는 메탄가스와 철 박막을 사용하였으며, 합성 수율의 변화는 고분해능 주사전자현미경을 이용하여 관찰하였다. 그리고 합성된 SWNTs의 형태 및 결정성은 라만분광법과 원자간힘현미경을 이용하여 평가하였다. 결과적으로, 진행하였던 모든 합성 조건에서 반응기 중심보다 뒤의 영역에서 더 고수율의 SWNTs가 합성되었으며, 최적 합성 조건의 SWNTs 면밀도는 99% 이상이었다. 본 연구의 결과는 CVD 공정을 이용하는 다양한 저차원 나노 소재의 합성에도 적용될 수 있을 것으로 사료되며, 추후 이에 대한 연구가 필요하다.