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Jaebum Sung,Hoo Min Lee,Gil Ho Yoon,Sungchul Bae,Hongyun So 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.10 No.1
Polymer surfaces with wettability gradient were fabricated using three-dimensional (3D) printing technology to control the velocity of droplets on the surfaces. A microscale pattern of a semicircular casting mold was created layer-by-layer using a 3D printer based on fused deposition modeling. A surface with a wettability gradient was fabricated by replicating the semicircular mold with a continuously varying surface slope. Water contact angle measurements and droplet test results demonstrated the characterization of the wettability gradient. Droplets were released on a gradient surface inclined at 80°, and their movements were controlled; the locations of the droplets after collision on the ground were tracked. The distance of the main drop and splash drop was found to be reduced by 96.7% (from 6.1 to 0.2 cm) and 87.8% (from 18.8 to 2.3 cm), respectively, compared to that on a general superhydrophobic surface. This study demonstrates a simple, rapid, and inexpensive microfabrication method for functional polymer surfaces to control droplet movement using 3D printing technology.
Jaebum Park,김형진 대한화학회 2016 대한화학회지 Vol.60 No.4
This paper describes the synthesis of alkali metal salts of urea (ureates) and their application to the direct preparation of 4-nitrosoaniline from nitrobenzene via nucleophilic aromatic substitution of hydrogen. Sodium and potassium ureates were readily prepared from the reaction of urea with sodium hydride, metal methoxides, and metal hydroxides. The effect of ureates as nucleophiles on the conversion of nitrobenzene to 4-nitrosoaniline was investigated and compared with that of a urea-metal hydroxide mixture. It was found that the ureates were superior for producing 4-nitrosoaniline owing to their higher thermal stability of the ureate. The ureate obtained from the treatment of urea with sodium hydride gave the highest yield for the preparation of 4-nitrosoaniline. The ureates generated from the reaction of urea with metal hydroxide also gave high yields of 4-nitrosoaniline. Catalytic hydrogenation of 4-nitrosoaniline afforded polymer-grade 1,4-benzenediamine in quantitative yield.
세대차이가 승무원의 조직내 갈등과 내부커뮤니케이션에 미치는 영향
박재범 ( Jaebum Park ) 사단법인 아시아문화학술원 2021 인문사회 21 Vol.12 No.2
본 연구의 목적은 세대차이가 승무원의 조직내 갈등과 내부커뮤니케이션에 미치는 영향을 확인하고 통제변수의 효과를 분석하는 것이다. 연구를 진행하기 위해 수도권 지역에 근무하는 승무원 200명을 대상으로 세대차이와 조직내 갈등, 커뮤니케이션에 대한 구조화된 설문지를 이용하여 실증조사를 실행하였다. 본 연구의 결과, 첫째, 세대차이가 조직내 갈등에 미치는 영향을 검증한 결과, 구성원의 가치관이 낮을수록 관계갈등과 과업갈등이 높아지고, 직무가치를 높게 인식할수록 관계갈등과 과업갈등이 감소하는 것을 검증할 수 있었다. 둘째, 세대차이의 모든 구성요인이 내부커뮤니케이션에 직접적인 영향을 미치는 것으로 파악되었다. 셋째, 개인특성 요인의 통제효과를 검증한 결과, 근무경력과 직위가 세대차이에 의한 조직내 갈등을 감소하는 것으로 나타나 통제효과가 있는 것으로 검증되었다. 이러한 연구결과는 세대차이와 감정소진 등으로 조직내 갈등과 어려움을 겪는 승무원들을 대상으로 갈등문제를 해소하고, 예방할 수 있는 실천적 함의를 제공하였다는데 의의가 있다. The purpose of this study is to identify the effects of generation gap on internal organizational conflict of stewardess and internal communication, and to analyze the effects of control variables. For the study, an empirical survey was conducted on 200 stewardess working in the metropolitan area using a structured questionnaire on generation gap, internal organizational conflict, and communication. As a result of this study, first, as a result of verifying the effect of generation gap on organizational conflicts, relationship conflicts and task conflicts increase as the value of members is lower, and relationship conflicts and task conflicts decrease as the value of job value increases. Second, it was found that all the constituent factors of the generation gap have a direct influence on internal communication. Third, as a result of verifying the control effect of the factors of individual characteristics, it was verified that the work experience and position reduced the conflict within the organization caused by the generational gap, and thus had a control effect. These research results are meaningful in that they provided practical implications to resolve and prevent conflicts among flight attendants who suffer from conflicts and difficulties within the organization due to generational gap and exhaustion of emotions.