• 한국산학기술학회논문지
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• 제14권1호
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• pp.418-425
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• 2013

본 논문에서는 3가지 향기가 뇌파유형에 따른 피험자에게 미치는 영향과 피험자의 쾌적성 및 생산성을 향상시킬 수 있는 최적의 향기를 찾기 위한 연구를 하였다. 피험자들을 A타입과 B타입으로 분류하여 뇌파(EEG), 학습능력 및 심박동변이(HRV)를 측정하여 쾌적성, 집중력, 스트레스 및 심장박동의 변화를 분석하였다. 항온 항습실은 온도 31[$^{\circ}C$], 상대습도 80[RH%], 조도 1,000[lux] 및 기류 속도 0.02[m/sec]의 상대적으로 불쾌적한 조건에서 로즈마리, 쟈스민 및 헤이즐넛 향기를 이용하여 실내 환경을 변화시켜 주었다. 연구결과 쟈스민 향기가 A타입과 B타입의 상대${\alpha}$파, SEF50, $\frac{SMR}{\theta}$ 및 SDNN이 활성화 되었으며, 비대칭지수, 스트레스지수 및 피로도는 감소하였다. A타입과 B타입 모두 쟈스민 향기를 선호하는 것을 알 수 있었으나, A타입이 B타입 보다 향기에 더욱 민감하게 반응하였다. 따라서 쟈스민 향기가 쾌적성, 생산성 및 집중력 향상과 스트레스 및 피로도 감소에 효과적이다.

• 한국콘텐츠학회논문지
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• 제22권9호
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• pp.426-438
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• 2022

본 연구는 루게릭병 환자와 가족을 돕자고 호소하는 메시지를 대상으로 호혜적/공감적 소구의 상대적 효과를 탐색하였다. 이를 통하여 나눔 메시지의 전달에서 이성적으로 호소하는 방식인 호혜적 소구의 적용 범위를 살펴보고자 하였다. 공감적 관심 성향의 조절작용을 포함하였는데, 공감적 관심은 대표적인 이타적 성향이다. 온라인 실험 형태로 진행하였으며, 1단계에서 공감적 관심 성향을 측정하고, 대략 7일의 시간이 지난 후 2단계에서 호혜적/공감적으로 구분된 나눔 메시지를 보여주고 평가하도록 하였다. 불성실한 응답을 한 참가자를 제외하고 최종적으로 134명의 데이터를 분석하였다. 그 결과 공감적 소구의 상대적 우위가 일부 나타났지만, 호혜적/공감적 소구의 상대적 차이가 직접 나타난 경우는 주제 태도에 국한되었고, 상호작용의 결과에서 공감적 관심 성향이 높은 집단에서 호혜적 소구가 공감적 소구만큼 혹은 영향력이 더 큰 것으로 나타났다.

• 아시안잔디학회지
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• 제15권3호
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• pp.111-118
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• 2001

본 연구는 주거지역으로 둘러싸여진 4ha 규모의 녹지를 대상으로 토지피복현황 및 수고의 차이가 기상완화효과에 미치는 영향을 파악하기 위해 녹지 내의 기온 및 상대습도분포를 관측하였다. 그 데이터를 바탕으로 녹지의 토지피복현황과 기온 및 상대습도분포, 토지피복비율 및 수목그루와 기상완화효과와의 관련성을 회귀분석 등에 의해 해석하였다. 그 결과, 고온역은 인공구조물과 나지 주변에 저온역은 수림지와 초지 주변에서 형성되었다. 상대습도는 기온분포에 거의 대응하는 형태로 고온역은 저습역이구 저온역은 고습역으로 나타났다. 토지피복비율별 기상완화효과를 보면, 수림지와 초지율이 증가하면 기온은 떨어지고 상대습도는 상승시키는 효과를 보였다. 또, 수목그루의 증가는 수고에 관계없이 모두 기상완화에 효과적이고 그 효과의 효율은 교목, 소교목의 순이다.

• 한국지하수토양환경학회지:지하수토양환경
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• 제6권1호
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• pp.45-52
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• 2001

토양 및 지하수의 오염문제가 심각해짐에 따라 오염물의 토양 및 지하수 내에서의 이동 특성에 관한 관심이 커지고 있다. 본 연구에서는 비용해성 흐름의 특성 및 그의 특성을 결정짓는 상대투수에 관한 기본적인 이해와 초음파가 상대투수에 미치는 영향에 관하여서도 고찰하였다. 실험 및 역해석의 결과로는 초음파가 오염물의 제거에 상당히 큰 영향을 끼치는 것으로 나타났으며 상대투수의 특성도 크게 변화되는 것으로 나타났다. 변화량은 $(C_{10})^2$의 함수로 나타낼 수 있었으며 ECLIPSE 100을 사용하여 초음파가 오염 복원 및 상대투수의 변화에 관한 연구에 활용 될 수 있음이 고찰되었다.

• Nutrition Research and Practice
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• 제17권4호
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• pp.780-788
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• 2023

BACKGROUND/OBJECTIVES: This study examined the relationship between famine exposure in early life and the risk of type 2 diabetes in adulthood during the 1959-1961 Chinese Famine. SUBJECTS/METHODS: A total of 3,418 individuals aged 35-74 years free of diabetes from two studies in 2006 and 2009 were followed up prospectively in 2009 and 2012, respectively. Famine exposure was classified as unexposed (individuals born in 1962-1978), fetal exposed (individuals born in 1959-1961), child exposed (individuals born in 1949-1958), and adolescent/adult exposed (born in 1931-1948). A logistic regression model was used to assess the relationship between famine exposure and diabetes after adjustment for potential covariates. RESULTS: During a three-year follow-up, the age-adjusted incidence rates of type 2 diabetes were 5.7%, 14.5%, 12.7%, and 17.8% in unexposed, fetal-exposed, child-exposed, and adolescent/adult-exposed groups, respectively (P < 0.01). Relative to the unexposed group, the relative risks (95% confidence interval) for diabetes were 2.15 (1.29-3.60), 1.53 (0.93-2.51), and 1.65 (0.75-3.63) in the fetal-exposed, child-exposed, and adolescent/adult-exposed groups, after controlling for potential covariates. The interactions between famine exposure and obesity, education level, and family history of diabetes were not observed, except for the urbanization type. Individuals living in rural areas with fetal and childhood famine exposure were at a higher risk of type 2 diabetes, with relative risks of 8.79 (1.82-42.54) and 2.33 (1.17-4.65), respectively. CONCLUSIONS: These findings indicate that famine exposure in early life is an independent predictor of type 2 diabetes, particularly in women. Early identification and intervention may help prevent diabetes in later life.

• 센서학회지
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• 제21권6호
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• pp.440-445
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• 2012

Contact-type Linear Encoder-like Capacitive Displacement Sensor (CLECDiS) is a novel displacement sensor which has wide measurable range with high resolution. The sensor, however, is very sensitive to relative rotational alignment between stator and mover of the sensor as well as its displacement. In addition to, there can be some disturbances in the relative rotational alignment, so some noises occur in the sensor's output signal by the disturbances. This negative effect of the high sensitivity may become larger as increasing sensitivity. Therefore, this negative effect of the high sensitivity has to be compensated and reduced to achieve nanometer resolution of the sensor. In this study, a new type capacitive linear encoder with a mechanical guide is presented to reduce the relative rotational alignment problem. The presented method is not only to reduce the alignment problem, but also to assemble the sensor to the stage conveniently. The method is based on a new type CLECDiS that has mechanical guide autonomously. In the presented sensor, when the device is fabricated by micro-machining, the guide-rail is also fabricated on the surface of the sensor. By the direct fabrication of the guide-rail with high precision micro-machining, errors of the guide-rail can be reduced significantly. In addition, a manual yaw alignment is not required to obtain large magnitude of the output signal after the assembly of the sensor and the stage. The sensor movement is going to follow the guide-rail automatically. The prototype sensor was fabricated using the presented method, and we verify the feasibility experimentally.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2007년도 정기학술발표대회 논문집
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• pp.710-713
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• 2007

2002${\sim}$2006년까지 총 5년 동안 한국산업안전공단에 접수된 중대재해건수 총 2546건 중 추락사고로 인한 중대재해건수는 1444건으로 전체 재해발생률의 56.7%로 가장 높은 비중을 차지하고 있다. 본 연구는 2002${\sim}$2006년 한국산업안전공단의 중대재해 조사목록을 대상으로 추락중대재해의 발생형태별 재해율, 규모별, 공사종류별, 기인물별, 동업종경력별, 발생시점별 현황분석과 추락중대재해에 대한 직종-공사종류별, 직종-기인물별 현황을 교차분석 하였다. 이에 따라 본 연구는 건설 중대재해 발생형태 중 추락중대재해를 중심으로 발생인자별 현황을 분석하고, 인자별 교차분석하여 건설공사의 추락중대재해 발생특성을 도출함으로써 건설공사 시공현장에서 추락중대재해의 안전계획 수립 시 기초적 자료를 제공하고자 한다.

• 대한간호학회지
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• 제44권4호
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• pp.371-380
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• 2014

Purpose: The purpose of this study was to examine the effects of Cu/Zn SOD on reduction of hindlimb muscular atrophy induced by cisplatin in rats. Methods: Forty-two rats were assigned to three groups; control group, Cisplatin (CDDP) group and cisplatin with Cu/Zn SOD (CDDP-SOD) group. At day 35 hindlimb muscles were dissected. Food intake, activity, withdrawal threshold, muscle weight, and Type I, II fiber cross-sectional area (CSA) of dissected muscles were measured. Relative SOD activity and expression of MHC and phosphorylated Akt, ERK were measured after dissection. Results: Muscle weight and Type I, II fiber CSA of hindlimb muscles in the CDDP group were significantly less than the control group. Muscle weight and Type I, II fiber CSA of hindlimb muscles, food intake, activity, and withdrawal thresholds of the CDDP-SOD group were significantly greater than the CDDP group. There were no significant differences in relative SOD activities of hindlimb muscles between the CDDP-SOD and CDDP groups. MHC expression and phosphorylated Akt, ERK of hindlimb muscles in the CDDP-SOD group were significantly greater than the CDDP group. Conclusion: Cu/Zn SOD attenuates hindlimb muscular atrophy induced by cisplatin through increased food intake and activity. Increment of phosphorylated Akt, ERK may relate to attenuation of hindlimb muscular atrophy.

• 한국작물학회지
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• 제43권4호
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• pp.234-238
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• 1998

To select new germplasm for salinity tolerance from new plant type (NPT) breeding lines, the sixty F$_4$ lines selected from the crosses between Korean cultivars and IRRI's NPT lines were evaluated for salinity tolerance at the seedling stage with salinized culture solution (EC=12 dS/m) in the controlled conditions. Two NTP lines derived from a cross between 'Ilmibyeo' and 'IR66152-AC5-1', 'HR15258-7-1' and 'HR15258-27-1', were found to have good tolerance. The salinity tolerance of the lines was compared to their parents and the sensitive ('IR29') and tolerant ('Pokkali') checks in three salinity levels, no salinity (control) and an EC of 12 and 16 dS/m. Visual salinity score, shoot Na+ and Na-K ratio in two NPT lines was significantly low compared with the parents and IR29. Indicating that salinity tolerance of the lines might be derived from a transgressive segregation. The relative water content of the lines was higher than Pokkali, and the dry weight of shoot and root was proportionally decreased to salinity score and salinizing concentration. The visual salinity scores were significantly correlated with shoot Na concentration, Na-K ratio, relative water content, and reduction of dry weight (P<0.01). Their tolerance was attributed to root and shoot characteristics that led to high shoot water content, thus diluting the toxic effect of salts.

• Tribology and Lubricants
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• 제32권2호
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• pp.39-43
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• 2016

Magnetorheological elastomers (MREs) are a type of “smart” material, and their properties can be controlled rapidly and reversibly under the influence of an external stimulus. The application of an external magnetic field can change the shear modulus, hardness, and friction coefficient of MREs. The friction can cause vibration; moreover, the vibration can affect friction. The change of friction depends on the relative motion, normal force, roughness of the rubbing surfaces, material type, temperature, lubrication, relative humidity, and vibration condition. As MREs are a type of “smart material,” their friction coefficient can be reduced by applying an external magnetic field—the applications of this feature in engineering have been widely studied. However, the friction properties of MREs under vibration have not been tested to date. In this study, MRE samples and a reciprocating friction tester were fabricated. The friction coefficient was measured to evaluate the friction properties under various vibration conditions; subsequently, the wear depth and wear surface profile of the MRE were observed in order to evaluate the wear properties. The results show that the friction coefficient of the MREs decreased when a magnetic field was applied. Moreover, the friction coefficient decreased when the vibrational amplitudes increased. The wear depth of the MRE also decreased as the vibrational amplitudes increased.