승용차의 공기역학적 성능향상에 관한 실험 연구

조진수 空軍士官學校 1983 論文集 Vol.17 No.-

승용차의 연료절감을 위한 여러 방법 중 공기역학적 특성 향상을 이륙하는 방법은 매우 효과적인 방법이다. 승용차가 주행시 받게 되는 공기역학적 특성에는 여러 방향의 힘과 모멘트가 결부되어 있겠으나 우선 먼저 양력과 항력을 가능한 줄이는 것이 시급한 일이다. 본 연구에서는 이미 개발된 몇 종의 외부 부착물을 기존 차량에 장착하여 이에 의한 압력분포의 변화 및 양력과 항력 변화도를 측정했다.

고성능 2단 축류송풍기의 공력설계를 위한 수치해석 및 실험에 관한 연구

조진수,한철희,조이상,Cho, Jinsoo,Han, Cheolhui,Cho, Leesang 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.8

A numerical method and experiments for the aerodynamic design of high performance two-stage axial flow fans was carried out. A vortex ring element method used for the aerodynamic analysis of the propellers was extended to the fan-duct system. Fan Performance and velocity profiles at the fan inlet and outlet are compared with experimental data for the validations of numerical method. Performance test was done based on KS B 6311(testing methods for turbo-fans and blowers). The velocity profile was obtained using a 5-hole pitot tube by the non-nulling method. The two stage axial flow fan configurations for the optimal operation conditions were set by using the experimental results for the single rotating axial flow fan and the single stage axial flow fan. The single rotating axial flow fan showed relatively low efficiency due to the swirl velocities behind rotor exit which produced pressure losses. In contrast, the single stage and the two-stage axial flow fans showed performance improvements due to the swirl velocity reduction by the stator. The peak efficiency of the two stage axial flow fan was improved by 21% and 6%, compared to the single rotating axial flow fan and the single stage axial flow fan, respectively.

축류 마이크로 홴의 전산해석 및 성능시험

조진수,변태균,박왕식,전창근,Cho, Jin-Soo,Pyun, Tae-Kyoon,Park, Wang-Sik,Chun, Chang-Kun 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.7

A three dimensional linear frequency-domain lifting surface panel method was used for the aerodynamic analysis of axial flow type micro-fans. As proven by the duct modeling, the tip clearance of the micro-fans tested is large enough to ignore the calculated effect of the duct system. As the numerical results and experimental data agreed well in the operating point region, the method was applicable in the parametric studies to determine the design parameters of axial flow fans. Experiments on micro-fans were carried out based on KS B 6311. The newly designed micro-fan showed improvements in both static pressure rise and volumetric flow rate compared to the existing fans at a given operating condition. No detection of surging and the smooth characteristic curve proved the improvement in performance. To reduce the fan noise in the fan design, it was necessary to make use of the frequency spectrum analysis data. Measurement of sound pressure level for micro-fans was conducted based on KS B 6361 and KS A 0705. The peak - which occurs at blade passage frequency and its higher harmonics due to the fan noise - was not detected. This justifies the design methodology of the blade.

홴 후방 유동장을 고려한 홴싱크 설계에 관한 연구

조진수,한승호,한철희,Jo, Jin-Su,Han, Seung-Ho,Han, Cheol-Hui 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.8

A numerical and experimental study on the flow fields behind the fan outlet was carried out to improve the performance of a conventional fan-sink(fan and heat sink). Conventional fan-sinks have a heat sink of which fin configurations tend to increase the flow resistance, thus decreasing the performance and the cooling capabilities of a fan-sink. Lifting surface method is used for the prediction of flow fields behind the fan outlet. Oil-dot flow visualization technique is applied for the validation of numerical results. The numerical results and experimental data show agreement each other. A conventional heat sink is modified and redesigned using flow patterns behind the fan outlet. The newly designed heat sink has the configuration of curved fins which minimize flow resistance. It showed improvements in both cooling: capabilities and volumetric flow rate compared to the conventional one.

주파수영역 패널기법을 사용한 유도무기형태 동체에 장착된 엇회전식 프롭팬의 공력해석

조진수 대한기계학회 1994 대한기계학회논문집 Vol.18 No.6

The aerodynamic analysis of a $6{\times}6$ counter-rotating propfan around a missile-like-body has been completed analytically using a frequency domain panel method. The present method requires Fourier transformation of flow field around the propfan in computing the velocities normal to the propfan lifting surfaces. The aerodynamic performance curve is determined by angle of attack and nonuniform inflow conditions. The inflow conditions result from the variations of missile flight speed, angle of attack, propfan location relative to control surfaces and control surface deflection angle. The two cases of propfan location relative to control surface, front and behind, are analyzed and the aerodynamic results are presented.

데이터과학과 국어 교과서 개발의 접점

조진수 한국어교육학회 2023 한국어교육학회 학술발표논문집 Vol.2023 No.-

광주 지역인의 연결어미 사용에 대한 사례연구

조진수,백승주,이준환,조경순,조재형 한말연구학회 2023 한말연구 Vol.64 No.27

This study aims to identify the commonality and diversity of connective endings used by residents of Gwangju. Based on the exploratory case study methodology, four Gwangju residents were selected as informants, their conversations were recorded, and a total of 1,200 connective endings were extracted. First, the connective endings were divided into standard and dialect types, and the patterns of their use by informants were compared. The results showed that the standard and dialect form of connective endings coexisted and that within the dialect various sporadic variants were used together. Furthermore, we found that there was a difference in the usage rate among dialect type endings. For example, the standard form “-(eu)nikka” and the dialect forms “-(eu)ngkke, -(eu)ngge, -(eu)nkke, -(eu)nge, -(eu)nikke, -(eu)nkkero” coexisted, and the ratio of “-(eu)ngkke” was the highest among dialect forms. There were differences in the number of connective endings informants used and the ratio of standard language and other dialects. Informant-D used more types of connective endings and a greater number of dialect forms than other informants. Data mining techniques also confirmed differences in the use of connective endings among informants. Based on the frequency of use matrix of connective endings used by informants, the TF-IDF and cosine similarity was calculated. Thus, informants A, B, and C were classified into one group and informant D was classified into another. This study empirically confirmed the characteristics of connective endings used by residents of Gwangju. Further, it confirmed that the Gwangju local language has both commonality and diversity. .

""언어의 본질과 특성" 교육과정 설계의 방향"에 대한 토론문

조진수 한국문법교육학회 2016 한국문법교육학회 학술발표논문집 Vol.2016 No.1

3차원 비정상 양력면법을 이용한 날개의 초음속영역 플러터 해석

조진수,장윤혁 한국항공우주학회 1997 한국항공우주학회 학술발표회 논문집 Vol.- No.-

문법적 은유를 활용한수학 문장제 텍스트의 이해 과정 연구

조진수 한국텍스트언어학회 2018 텍스트언어학 Vol.45 No.-

This study aims to explain the process of understanding the word problem from the viewpoint of ‘grammatical metaphor’. For this purpose, we reviewed previous studies on word problem and grammatical metaphor, and analyzed word problems based on them. As a result, we confirmed that the grammatical metaphor mediates the representation transformation from verbal expression to a mathematical formula, and confirmed that word problem can be typed based on the use of grammatical metaphors. In addition, it is confirmed that the process of converting the word problem is subtyped as ‘a type in which the conversion takes place in the text’ and ‘a type in which the conversion is performed by the interaction between the inside and the outside of the text’. This study is significant in that it suggests a way to approach the understanding of word problem which has been rarely dealt with in the text linguistics. The question of whether the grammatical metaphor can be a mediator in the process of understanding word problem should be discussed through empirical studies based on the actual performance of the learners in the future