• 한국진공학회:학술대회논문집
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• 한국진공학회 2009년도 제38회 동계학술대회 초록집
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• pp.470-470
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• 2010

Negative ions are generated in fusion edge plasmas, material processing plasmas, ionospheric plasmas. Analytic formulas for the deduction of the absolute density of negative ions was given by using the current-voltage(IV) characteristics of two electric probes at two different pressures [1], and negative ion density has been measured by one electric probe using the current-voltage characteristics of three different pressures [2]. Ratios of ion and electron saturation currents and electron temperatures and sheath areas of different pressures are usually incorporated into two equations with two unknowns for the negative ion density. In the previous publications, the sheath factor(sheath area, sheath density, sheath velocity) and effective masses of background ions with different pressures are qualitatively incorporated for the deduction of negative density. In this presentation, the quantitative and detailed relation of negative ion density with sheath factor and effective masses are going to be given. The effect of these parameters on the change of IV characteristics will be addressed.

• 한국전산구조공학회논문집
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• 제14권4호
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• pp.469-479
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• 2001

본 연구에서는 다층 층간분리된 적층보의 자유진동해석을 수행하였다. 적층보에 존재하는 다층 층간분리가 고유진동수에 미치는 영향을 고찰하기 위해 층간분리단에서의 연속조건을 유도하고, 층간분리된 각각의 분할보의 경계에서 유도된 연속조건을 이용하여 진동수 방정식을 유도하였다. 이론해석결과의 검증을 위해 범용 프로그램을 이용한 유한요소해석을 수행하였으며, 서로 잘 부합됨을 보였다. 고유진동수 변화는 다층 층간분리의 크기와 위치 및 형태에 따라 변하였다. 얻어진 결과로부터 다층 층간분리가 적층보의 동적특성에 미치는 민감도와 층간분리의 위치와 크기를 탐지하는데 활용될 수 있는 가능성을 제시하였다.

• 가정과삶의질연구
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• 제25권4호
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• pp.1-16
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• 2007

The purpose of this study is to examine adolescent future orientation in relation to education, work and career, and marriage and family. This study also explores the effects of adolescent future orientation in relation to their psychosocial characteristics: self-esteem, self-control, scholastic performance, and sexual permissiveness. Data were collected from 345 students in the second grade (male: 166, female: 179) of two middle schools in Seoul, Korea. Scale for adolescent future orientation was formulated based on literature review. The major findings of this study were as follows. Adolescents were found to be more future-oriented in the areas of work and career and in the area of marriage and family than in the area of education. Several hierarchical multiple regression analyses were also performed to examine the contribution of socio-demographic characteristics and future orientation to predictions of adolescent psychosocial characteristics. This study found that adolescent future orientation significantly predicted their self-esteem, self-control, and scholastic performance, while having no significant influence on sexual permissiveness.

• 동의생리병리학회지
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• 제29권6호
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• pp.451-457
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• 2015

The study about the five viscera's "Syndromes due to Damage" and "Disease" of 『Donguibogam. Five viscera and Six Bowels』, with several existing information on the specificity of the five viscera, were discussed as the physiological characteristics and the pathological conjugation of the five viscera. The results were as follows. The five viscera keep Essence, Spirit, Qi, Blood, Ethereal soul, and Corporeal soul, and There inside the body and keeping in the center. Based on this, it serves to make the body to strengthen. So it can be understood in relation to meat and shells. Characteristics of the specificity of the five viscera is determined to see the eyes, nose, mouth, ears revealed the face and the body that protect the five viscera, and characteristics that in relation to the date or time or season, Also that determined in conjunction with the face color, skin condition. In 『Lingshu』, 『Nanjing』 "how do pathogen involvement in the disease of the five viscera" and "disease occurs spontaneously in the Main meridian of the five viscera " and "Syndromes due to Damage to the Five viscera" in 『Donguibogam. Five viscera and Six Bowels』, It was discussed about the physiology and the pathology that is caused by biological activity according to the characteristics of the five viscera specificity "Outer symptoms" of "Five viscera Disease" in 『Donguibogam. Five viscera and Six Bowels』 is the description of the characteristics of behavior and emotional characteristics of the specificity of the five viscera. Also if you use excessive functions associated with emotional that was fall in consumptive disease.

• 한국분무공학회지
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• 제9권1호
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• pp.30-36
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• 2004

The purpose of this study was to investigate the fuel spray characteristics that made most important at an homogeneous air fuel mixture, in a common rail direct injection type HCCI engine. As a study conducted relation which a back pressure and injection pressure are influenced to air fuel mixture characteristics, we tried to offer date even through we select suitable to a HCCI engine running condition of the fuel injection condition. To accomplish the study, to measure a injection rate of common rail type injector and to visualize and simulate a fuel spray was conducted. From the result of injection rate, a common rail injector was confirmed to appear a initial delay of 0.3msec and a latter period delay of 0.7msec. Therefore, real injection duration was determined by about 0.5msec increasing. From the result of fuel spray, the spray penetration was proportional to 1/4 exponent of atmosphere pressure. An experimental equation was deduced from the spray penetration of spray visualization experiment and the relation of injection duration and penetration was estimated in HCCI engine using an experimental equation.

• 한국전기전자재료학회논문지
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• 제13권7호
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• pp.598-606
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• 2000

In this paper we investigated the relation between the surface degradations and anti-pollution characteristics of Room Temperature Vulcanized(RTV) silicone rubber coating that has different roughness through immersing into saline water. We utilized several analytic techniques such as atomic force microscopy(AFM) scaning electron microscopy(SEM) contact angle Salt Deposit Density(SDD) and average leakage current under the condition of salt fog. It is found that the surface roughness of treated RTV silicone rubber increased and the hydrophobicity of sample surface decreased with increasing the duration o immersion into water due to the erosion of base polymer the melting down alumina trihydrate(ATH) and the diffusion of Low Molecular weight(LMW) fluid. Despite the roughness of surface had been increased by water immersion excellant anti-pollution and recovery characteristics were maintained and SDD saturated to 0.1~0.14mg/cm$^2$. The average leakage current under salt fog increased with surface roughness. Measurement of average leakage current will be helpful to investigate surface degradation and lifetime expectation of RTV silicone coating.

• 디자인학연구
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• 제11권2호
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• pp.251-262
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• 1998

본 연구는 현대 소비사회의 공예품의 생산과 수용에 관한 현실적 이해로써의 공예키치에 관련된 키치적 특성에 대한 것이다. 오늘날 키치는 우리생활환경의 이해를 위한 중요한 대상으로 등장하였다. 특히 공예품과 키치는 매우 밀접한 관계를 맺고 있다고 할 수 이다. 따라서 본 연구는 이에 대한 기초적인 이해와 바탕을 염두에 두면서 현대사회에서 키치가 어떻게 공예품 생산과 수용에 내재하는가를 목적으로 작성 되었다. 이에 공예품 생산의 키치적 특성으로는, 1. 절충주의적 양식 2. 허위적 연출성 공예품 수용의 키치적 특성으로는, 1. 소유의 자기만족 2. 자기위안으로써의 문화적 향유욕구 3. 과거에의 향수심리 4. 과시와 차별화로 요약할 수 있었다.

• 한국농공학회논문집
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• 제53권6호
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• pp.31-41
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• 2011

This study was conducted to predict future land-cover changes under climate change scenarios and to cluster analysis of regional land-cover characteristics. To simulate the future land-cover according to climate change scenarios - A1B, A2, and B1 of the Special Report on Emissions Scenarios (SRES), Dyna-CLUE (Conversion of Land Use Change and its Effects) was applied for modeling of competition among land-use types in relation with socioeconomic and biophysical driving factors. Gyeonggi-do were selected as study areas. The simulation results from 2010 to 2040 suggested future land-cover changes under the scenario conditions. All scenarios resulted in a gradual decrease in paddy area, while upland area continuously increased. A1B scenario showed the highest increase in built-up area, but all scenarios showed only slight changes in forest area. As a result of cluster analysis with the land-cover component scores, 31 si/gun in Gyeonggi-do were classified into three clusters. This approach is expected to be useful for evaluating and simulating land-use changes in relation to development constraints and scenarios. The results could be used as fundamental basis for providing policy direction by considering regional land-cover characteristics.

• 한국정밀공학회지
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• 제23권2호
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• pp.104-112
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• 2006

The influence of tire belt angle on the Plysteer Residual Aligning Torque(PRAT) and the cornering stiffness by the FEM has been studied. The PRAT is a performance factor of the tire about vehicle pull, and the cornering stiffness has relation to vehicle steering response of outdoor test. To validate FE model for analysis, simulation data for both the static stiffness(vertical, lateral) and the PRAT have been compared with the experimental data. In addition to the characteristics of the PRAT and the cornering stiffness due to the tire belt angle, rolling and cornering contact characteristics have been studied. The tendency of the PRAT and the cornering stiffness due to the belt angle can be used as a guide line for the tire design in relation to vehicle pull and vehicle steering response.

• 한국도로학회논문집
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• 제11권4호
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• pp.17-23
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• 2009

노상토의 변형특성은 포장설계에 있어서 매우 중요한 기본적인 입력물성치다. 노상토의 탄성계수를 실험적으로 결정하기 위해서는 많은 노력이 필요하다. 포장 단면이 간단하거나 중요도가 낮은 도로 설계의 경우 시험적인 탄성계수 결정이 과다한 비용을 요구하게 된다. 보다 간편한 대체시험 또는 기초물성치로부터 탄성계수를 결정하는 다양한 경험모형이 제안되어 있다. 본 연구에서는 7종의 국내 노상토에 대한 시험을 수행하였다. 국내 노상토의 경우 강도특성과 변형특성의 밀접한 상관성을 확인 하였으며, 경험적 상관모형을 제안하였다. 점착력과 낮은 구속응력단계에서의 탄성계수는 매우 큰 상관관계가 있었다($r^2=0.93$). 제안된 상관모형을 적용하여 강도특성으로부터 추정된 탄성계수와 시험을 통하여 측정된 탄성계수의 비교에서 결정계수($r^2$)는 0.75로 나타났다.