• Title, Summary, Keyword: Activity Limitation

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Consideration of Nano-Measurement Strategy (나노물질의 측정전략의 주요 쟁점)

  • Yoon, Chung-Sik
    • Journal of Environmental Health Sciences
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    • v.37 no.1
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    • pp.73-79
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    • 2011
  • The growing interest in nanotechnology has resulted in increasing concern and a number of published environmental and workplace measurements for assessing occupational exposure to engineered nanomaterials. However, the amount of previous exposure data remains limited. Furthermore the data available was collected with extensive variation in terms of exposure measurement strategy, which limits the ability to pool the data in the future. In response, this paper reviewed several pertinent issues related to exposure measurement strategy to suggest a harmonized measurement strategy which would make exposure data more useful in the future, e.g. correlation between exposure metrics, relationship between activity and exposure, task-based or shift-based assessment, background concentration, limitation of personal exposure monitoring and other determinants of exposure/modeling. An improved sampling strategy for nanomaterial exposure assessment should be considered in order to maximize the use of the data from various real time monitoring instruments.

Feasibility Study of IAQ Enhancement by Visible Light Photocatalyst (가시광 응답형 광촉매 제조와 이를 활용한 실내공기환경 개선 적용 타당성 조사)

  • Lee, Tai-Kyu;Yoon, Woo-Sug;Kim, Dong-Hyung;Hwang, Chul-Soon;Lim, Ji-Hun;Yoon, Jung-Ho;Kim, Young-mi
    • KIEAE Journal
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    • v.4 no.2
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    • pp.37-40
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    • 2004
  • New visible photocatalyst(Nanovis$^{(R)}$) has been synthesized to overcome the barrier of limitation of UV light utilization of current $TiO_2$ photocatalyst. It was found that red shift of absorption spectrum to 550nm was achieved. Its physical properties were characterized by XRD, BET and TEM. It is also observed that Nanovis$^{(R)}$ has a photocatalytic activity for photodegradation of Trichloroethylene under visible light irradiation. V,VII group doped into substitutional sites of $TiO_2$ has proven to be indispensable for band-gap narrowing and photocatalytic activity. These test results lead us to conclude that Nanovis$^{(R)}$ can be used for IAQ improvemen and for photocatalytic water splitting to hydrogen.

The Influence Factors of Health-related Quality of Life on Urinary Incontinent Elderly Women (요실금 여성노인의 건강관련 삶의 질 영향요인)

  • Lee, Jin-Sook;Lee, Eun-Ju
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.20 no.5
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    • pp.285-291
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    • 2019
  • This study was conducted to identify the factors influencing health-related quality of life of urinary incontinent elderly women. The Korea National Health and Nutrition Examination Survey (KNHANES) conducted by the Korea Centers for Disease Control and Prevention (KCDC) was used as baseline data to evaluate how activity limitation, depression experience and subjective health perception influence the health-related quality of life of urinary incontinent elderly women. The urinary incontinent elderly women differed significantly in terms of activity limitation, depression experience, subjective health perception influence and health-related quality of life compared to elderly women without incontinence. In contrast, income and education were not correlated with either of the aforementioned groups. The subjective health perception was identified as the only factor influencing the health-related quality of life of urinary incontinent elderly women. The results of this study will serve as basic data for positive treatment promotion and development of assessment programs for incontinence patients who recognize incontinence symptoms as part of the aging process and are therefore unwilling to receive care.

Suicidal Ideation and Associated Factors by Sex in Adolescents (성별에 따른 청소년의 자살생각과 관련요인)

  • Kim, Ji-Soo
    • The Journal of the Korea Contents Association
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    • v.12 no.12
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    • pp.261-268
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    • 2012
  • This study investigates suicidal ideation and its associated factors by sex in adolescents, focusing health behaviors and health status. For this study, data of 931 adolescents(11-18years) from the Fifth Korean National Health and Nutrition Examination Survey(KNHANES V-1, 2010) were analyzed. Those who had activity limitation, depression, less exercise showed higher suicidal ideation. For male adolescents, those who were high school student compared with middle school showed lower suicidal ideation and had depression showed higher suicidal ideation. On the other hand, the risk factors of suicidal ideation for female adolescents were activity limitation, smoking experience, depression, less exercise. The development of suicide prevention program for adolescents requires different approaches for each sex.

The Relationship between Yangsaeng and General Health Status : Based on 2008-2010 Korean National Health and Nutrition Examination Survey (2008-2010년 국민건강영양조사 자료를 활용한 한의학 양생법과 전반적인 건강수준과의 관계)

  • Cheon, Chun-Hoo;Park, Jeong-Su;Park, Sun-Ju;Nam, Koong-Won;Lee, Je-Yeol;Jo, Jae-Kyung;Shin, Yong-Cheol;Ko, Seong-Gyu
    • Journal of Society of Preventive Korean Medicine
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    • v.16 no.3
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    • pp.119-128
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    • 2012
  • Objective : The aim of this study is to investigate the relationship between Yangsaeng and general health status. Methods : In this study, we used data from the combined 2008-2010 Korean National Health and Nutrition Examination Survey(KNHANES). Mental Yangsaeng was measured by stress recognition and depression. Food Yangsaeng was measured by breakfast skipping and mixed grain diet. Life style Yangsaeng was measured by sleeping time and working pattern. Exercise Yangsaeng was measured by walking and exercise. We defined general health status as EQ-5Dindex, EQ-5Dvas, frequency and day of lying in a sickbed in last one month and activity limitation. Results : Mental Yangsaeng, food Yangsaeng, life style Yangsaeng and exercise Yangsaeng have 8 factors. Most of factors significant correlation with EQ-5Dindex, EQ-5Dvas, frequency and day of lying in a sickbed in last one month and activity limitation. Conclusion : Yangsaeng and general health status have positive correlation.

A Modeling Approach: Effects of Wetland Plants on the Fate of Metal Species in the Sediments (퇴적물에서 금속 이온 거동에 미치는 습지 식물의 영향에 관한 모델 연구)

  • Choi, Jung Hyun
    • Journal of Korean Society on Water Environment
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    • v.24 no.5
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    • pp.603-610
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    • 2008
  • A mathematical model was developed to understand how the presence of plants affects vertical profiles of electron acceptors, their reduced species, and trace metals in the wetland sediments. The model accounted for biodegradation of organic matter utilizing sequential electron acceptors and subsequent chemical reactions using stoichiometric relationship. These biogeochemical reactions were affected by the combined effects of oxygen release and evapotranspiration driven by wetland plants. The measured data showed that $SO_4{^{2-}}$ concentrations increased at the beginning of the growing season and then gradually decreased. Based on the measured data, it was hypothesized that the limitation of the solid phase sulfide in direct contact with the roots may result in the gradual decrease of $SO_4{^{2-}}$ concentrations. With the dynamic formulation for the limitation of the solid phase sulfide, model simulated time variable sulfate profiles using published model parameters. Oxygen release from roots produced divalent metal species (i.e. $Cd^{2+}$) as well as oxidized sulfur species (i.e. $SO_4{^{2-}}$) in the sediment pore water. Evapotranspiration-induced advection increased flux of divalent metal species from the overlying water column into the rhizosphere. The increased divalent metal species were converted to the metal sulfide with sufficient FeS around the rhizosphere, which contributed to the decrease of bioavailability and toxicity of divalent metal activity in the pore water. Since the divalent metal activity is a good predictor of the metal bioavailability, this model with a proper simulation of solid phase sulfide plays an essential role to predict the dynamics of trace metals in the wetland sediments.

Coo-Sun activity a man of mind rule and its effect on the quality of life of female cancer patients suffering from anxiety and depression (구선 활인심법이 여성 암 환자의 삶의 질과 불안 및 우울에 미치는 영향)

  • Nam, Ho-Young;Jeong, Tae-Young;Yoo, Hwa-Seung;Yoo, Dong-Youl
    • The Journal of Korean Obstetrics and Gynecology
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    • v.23 no.2
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    • pp.85-94
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    • 2010
  • Purpose: This study aimed to investigate a clinical effect of Coo-Sun activity focusing on improvement of quality of life in female cancer patients. Methods: The subject of study consisted of 5 female cancer patients at the East-West Cancer Center of OO Oriental hospital. The survey methods of this study are Functional Assessment of Cancer Therapy-General (FACT-G) and State-Trait Anxiety Inventory (STAI). Patients performed Coo-Sun activity 6 times a week and filled out FACT-G and STAI questionnaire after every 3 times training. Results: In FACT-G questionnaire, physical well-being and emotional wellbeing was improved significantly after Coo-Sun activity. And change of social/family well-being and functional well-being score were not significant statistically. In STAI questionnaire, STAI1 was improved significantly after Coo-Sun activity. And change of STAI2 score was not significant statistically. Conclusion: After Coo-Sun activity, quality of life (QOL) in female cancer patients was improved and anxiety was decreased. But this study have limitation to prove effects of Coo-Sun activity completely in female cancer patients. So well designed prospective cohort study will be needed to prove its benefits.

A Study on the Visual Representation in Mathematics Education (수학교육에서 시각적 표현에 관한 소고)

  • 이대현
    • The Mathematical Education
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    • v.42 no.5
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    • pp.637-646
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    • 2003
  • Visual representation is very important topic in Mathematics Education since it fosters understanding of Mathematical concepts, principles and rules and helps to solve the problem. So, the purpose of this paper is to analyze and clarify the various meaning and roles about the visual representation. For this purpose, I examine the status of the visual representation. Since the visual representation has the roles of creatively mathematical activity, we emphasize the using of the visual representation in teaching and learning. Next, I examine the errors in relation to the visual representation which come from limitation of the visual representation. It suggests that students have to know conceptual meaning of the visual representation when they use the visual representation. Finally, I suggest some examples of problem solving via the visual representation. This examples clarify that the visual representation gives the clues and solution of problem solving. Students can apprehend intuitively and easily the mathematical concepts, principles and rules using the visual representation because of its properties of finiteness and concreteness. So, mathematics teachers create the various visual representations and show students them. Moreover, mathematics teachers ask students to design the visual representation and teach students to understand the conceptual meaning of the visual representation.

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Study on the Classification of the Mixed-Use Development in terms of the Use and Function in Foreign Countries (해외 도심복합시설의 용도 및 기능에 따른 유형분류)

  • Lee, Ha-Shik;Jung, Bo-Ra;Choi, Young-O;Chae, Chang-U;Lee, Kang-Hee
    • Proceeding of Spring/Autumn Annual Conference of KHA
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    • pp.245-250
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    • 2008
  • The city means not only a geographical area as a role of the spatial boundary, but also a socio-economic place to communicate with each part. It requires various functions to get the income and activities. But city has a limitation of a available land to provide the required function and a sufficient space to supply the activity. Therefore, the development trend of city has not been to spread to the horizontal area any more and considered the vertical area. In addition, various functions put into a massive building because many people want to solve the daily requirements without spending time and cost. In this paper, it aimed at classifying the mixed-use building into function, circulation, relation between the public and private space and the building shape to provide the design information according to the development constraints such as land area, functional limitation, accessibility, etc. The classification of the mixed-use buildings is divided into four areas. The data are collected with foreign countries in Japan, Europe and US.

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Two-component Signal Transduction in Synechocystis sp. PCC 6803 under Phosphate Limitation: Role of Acetyl Phosphate

  • Juntarajumnong, Waraporn;Eaton-Rye, Julian J.;Incharoensakdi, Aran
    • BMB Reports
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    • v.40 no.5
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    • pp.708-714
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    • 2007
  • The two-component signal transduction, which typically consists of a histidine kinase and a response regulator, is used by bacterial cells to sense changes in their environment. Previously, the SphS-SphR histidine kinase and response regulator pair of phosphate sensing signal transduction has been identified in Synechocystis sp. PCC 6803. In addition, some response regulators in bacteria have been shown to be cross regulated by low molecular weight phosphorylated compounds in the absence of the cognate histidine kinase. The ability of an endogenous acetyl phosphate to phosphorylate the response regulator, SphR in the absence of the cognate histidine kinase, SphS was therefore tested in Synechocystis sp. PCC 6803. The mutant lacking functional SphS and acetate kinase showed no detectable alkaline phosphatase activity under phosphate-limiting growth conditions. The results suggested that the endogenous acetyl phosphate accumulated inside the mutants could not activate the SphR via phosphorylation. On the other hand, exogenous acetyl phosphate could allow the mutant lacking functional acetate kinase and phosphotransacetylase to grow under phosphate-limiting conditions suggesting the role of acetyl phosphate as an energy source. Reverse transcription PCR demonstrated that the transcripts of acetate kinase and phospho-transacetylase genes in Synechocystis sp. PCC 6803 is up-regulated in response to phosphate limitation suggesting the importance of these two enzymes for energy metabolism in Synechocystis cells