• Journal of Magnetics
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• 제6권3호
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• pp.94-100
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• 2001

Fe-Co-Ni particles with an average size of 45 and 135 nm are characterized in terms of magnetic phase transformation and magnetic properties at room temperature. BCC structure of Fe-Co-Ni spherical particles can be synthesized from Fe-Co-Ni-Al-Cu precursor films by heating at 600-80$0^{\circ}C$ for the phase separation of Fe-Co rich Fe-Co-Ni particles, followed by a post heating at $600^{\circ}C$ for 5 hours. The average size of nanoparticles was directly determined by the thickness of precursor films. Exchange interactive hysteresis was observed for the nano-composite (Fe-Co-Ni)+(Fe-Ni-Al) films resulting from the short exchange interface between ferromagnetic Fe-Co-Ni particles surrounded by almost papramagnetic Ni-Al-Fe matrix. Arraying the isolated Fe-Co-Ni nano-particles in a random arrangement on $Al_2O_3$substrate the particle assembly showed a behavior of dipole interactive ferromagnetic clusters depending on their volume and inter-particle distance.

• Journal of Magnetics
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• 제12권2호
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• pp.68-71
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• 2007

Even a pure bulk Fe has a complicated magnetic phase and its magnetism is still needed to be clarified. In this study we investigated the magnetism of bcc and fcc bulk Fe with total energy calculations as functions of atomic volume. The full-potential linearized augmented plane wave method was adopted within a generalized gradient approximation. The ground state of bulk Fe is confirmed to be of ferromagnetic (FM) bcc. For fcc structured Fe an antiferromagnetic (AFM) state is more stable compared to FM states which exist as low spin and high spin states. The stable AFM states were found to accompany a tetragonal distortion, while the FM states remained in a cubic symmetry. At an expanded lattice constant a high spin FM state was calculated to be able to be stabilized with significant enhanced magnetic moment compared to the value of the ground state, bcc FM.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 D
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• pp.1882-1884
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• 1999

The photoisomerization of functional polyimide was investigated in the various temperatures and UV(360nm) & visible(450nm) light irradiation. The absorption spectrum of azobenzene containing polyamic acid in a mixture of N,N-dimethylacetamide and benzene(1:1 by volume) solution was induced photoisomerization by UV and visible light irradiation. The absorption spectrum of LB films are also induced photoisomerization by UV and visible light irradiation.

• 한국식품조리과학회지
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• 제13권2호
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• pp.113-123
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• 1997

Conventional foodservice system has been the most prevalent system across the country. However, all the elementary students throughout the country is not being provided with school lunch program because of the restriction on equipping school foodservice facilities. So commissary foodservice system was introduced to school lunch program in 1991. This study was designed to evaluate condition of existing major equipment including volume, probable useful life, and frequency of use and determine equipment improvements on conventional and commissary school foodservice systems. A questionnaire was developed and mailed to 87 dietians of conventional and 46 dietians of commissary school foodservices in Kyunggi-do. Response rates were 89.1% and 91.3%, respectively . Approximately one third of commissary foodservices were converted from conventional to commissary. Only 52.6% of conventional and 53.5% of commissary foodservice facilities/equipments have been desirable in quality and quantity. Capacity, functional ability, using frequency, and relationship with efficient work management were analyzed according to school foodservice system. Content analysis was conducted regarding to dietitians' opinions on foodservice facilities/equipment.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2022년도 봄 학술논문 발표대회
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• pp.99-100
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• 2022

This study analyzed the basic characteristics of mortar using CGS modified by pretreatment. As a result of the analysis, it was found that CGS after reforming can be partially replaced with fine aggregates to solve the existing air volume reduction problem when used, and can contribute positively in terms of securing fluidity and improving strength. Therefore, it is considered necessary to verify as a functional material of CGS through concrete durability experiments as a future task.

• Tuberculosis and Respiratory Diseases
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• 제73권4호
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• pp.197-203
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• 2012

Recent advances in bronchoscopy have led to changes in clinical diagnostics and therapeutics in pulmonary medicine. In diagnostic bronchoscopy, there have also been new developments in endobronchial ultrasound technology which may be incorporated into clinical practice in the near future. Functional bronchoscopy, which evaluates information such as airway pressure, airflow, or gas exchange, suggests promising clinical advances in the near future. In therapeutic bronchoscopy, bronchoscopic volume reduction is a novel approach for the treatment of severe emphysema. In this review, seven recently published articles representing current advances in bronchoscopy are summarized and discussed.

• 대한영상의학회지
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• 제84권5호
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• pp.1123-1133
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• 2023

목적 만성폐쇄성폐질환의 CT에서 자동 정량 측정된 체성분과 폐기능 또는 정량적 변수들 사이의 연관성을 알아보고자 하였다. 대상과 방법 총 290명의 만성폐쇄성폐질환 환자를 대상으로 연구하였다. 흉부 CT에서 근육 및 피하지방 부피, T12 레벨에서 근육 및 피하지방 면적 및 골 감쇠를 딥러닝 기반 분할 알고리즘을 사용하여 획득하였다. Parametric response mapping-derived emphysema (이하 PRM^emph), PRM-derived functional small airway disease (이하 PRM^fSAD) 및 기도 벽 두께(airway wall thickness; 이하 AWT)-Pi10을 정량적으로 평가하였다. Pearson 상관 분석을 사용하여 체성분과 결과 간의 연관성을 평가하였다. 결과 근육과 피하지방의 부피와 면적은 PRM^emph와 PRM^fSAD와 음의 상관관계를 보였다(p < 0.05). T12에서의 골밀도는 PRM^emph와 음의 상관관계를 보였다(r = -0.1828, p = 0.002). 피하지방의 부피와 면적과 T12에서의 골밀도는 AWT-Pi10과 양의 상관관계를 보였다(r = 0.1287, p = 0.030; r = 0.1668, p = 0.005; r = 0.1279, p = 0.031). 반면에 근육 부피는 AWT-Pi10과 음의 상관관계를 보였다(r = -0.1966, p = 0.001). 근육 부피는 폐기능과 의미 있는 연과성을 보였다(p < 0.001). 결론 흉부 CT에서 정량적으로 평가된 체성분은 만성폐쇄성폐질환의 표현형 또는 중증도와 연관성을 보인다.

• 한국정밀공학회지
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• 제30권3호
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• pp.317-323
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• 2013

In-mold coating is a reactive fluid designed to improve the surface quality of injection molded thermoplastic substrate in functional and cosmetic properties. In this study, a mixing head for in-mold coating was designed, and mixing characteristics of two-component polyurethane flowing through runner were investigated based on flow simulations. In order to achieve uniform mixing of two components injected through straight mixing head, an impingement aftermixer was used in runner design. Semi-circular cross-section was better than circular one for runners for uniform mixing. With increasing runner length and flow rate, mixing became more uniform. In addition, the degree of mixing was more improved with decreasing viscosity of isocyanate.

• 한국식생활문화학회지
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• 제21권1호
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• pp.76-80
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• 2006

This study investigated the quality characteristics of demi-glace sauce that is used widely in western cuisine depending on adding volume of basil which has a specific aroma, taste and some functional ability. Analysis of color differences of demi-glace sauce was showed that a-value of demi-glace sauce decreased with adding basil, whereas viscosity of the demi-glace sauce was decreased. There were no significant differences in color, aroma, taste, appearance, viscosity, feel in mouse and general acceptability with sex and age of subjects. Demi-glace sauce with 2% basil showed best score in sensory evaluation. From theabove results, our data suggest that addition of 2% basil to demi-glace sauce is recommend for commercial use.

• 한국항해항만학회지
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• 제45권6호
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• pp.306-313
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• 2021

국가어항은 어선의 피항지로 운영되고 있고, 항구의 식별 및 통항선박의 안전 등을 고려하여 기능시설인 방파제등대가 설치되어 있다. 본 연구에서는 전국 105개 국가어항의 통항량을 기반으로 방파제등대(234기) 서비스수준을 추정하였다. 이를 위해 평가항목의 결정, 기준지수 산정(Fs=1), 근접항 식별, 방파제등대의 기능(서비스수준) 추정 순으로 진행하였다. 하지만 국가어항은 어항의 규모, 통항량, 어선 수용능력 등이 상이하였다. 따라서 105개의 국가어항은 군집분석을 통해 3개의 그룹으로 나누었다. 군집분석은 방파제등대의 서비스수준 요소인 제적어선 척수, 어선톤수, 연간 입출항척수, 어선 수용능력 등을 기준으로 하였다. 추정결과 방파제등대의 서비스수준(등탑의 높이, 등고, 광달거리, 등고)은 그룹1이 10.50m, 16.50m, 7.00mile, 5.5sec이고, 그룹2가 10.67m, 16.16m, 8.33mile, 6.0sec이며, 그룹3이 11.53m, 16.75m, 6.75mile, 5.0sec이다. 이러한 연구결과는 차후 어항에 방파제등대를 신설할 경우 통항선박의 서비스수준 향상을 위한 기초자료로 활용될 수 있을 것이다.