사출성형공정에서 금형에 전달되는 진동 신호 측정을 이용한 성형 단계별 공정시간과 공정특성의 모니터링에 대한 연구

이준한,김종선,Lee, Jun-han,Kim, Jong-Sun 한국금형공학회 2020 한국금형공학회지 Vol.14 No.3

In this study, the vibration signal of the mold was measured and analyzed to monitoring the process time and characteristics during injection molding. A 5 inch light guide plate mold was used to injection molding and the vibration signal was measured by MPU6050 acceleration sensor module attached the surface of fixed mold base. Conditions except for injection speed and packing pressure were set to the same value and the change of the vibration signal of the mold according to injection speed and packing pressure was analyzed. As a result, the vibration signal had a large change at three points: "Injection start", "V/P switchover", and "Packing end". The time difference between "injection start" and "V/P switchover" means the injection time in the injection molding process, and the time difference between "V/P switchover" and "Packing end" means the packing time. When the injection time and packing time obtained from the vibration signal of the mold are compared with the time recorded in the injection molding machine, the error of the injection time was 2.19±0.69% and the error of the packing time was 1.39±0.83%, which was the same level as the actual value. Additionally, the amplitude at the time of "injection start" increased as the injection speed increased. In "V/P switchover", the amplitude tended to be proportional to the pressure difference between the maximum injection pressure and the packing pressure and the amplitude at the "packing end" tended to the pressure difference between the packing pressure and the back pressure. Therefore, based on the result of this study, the injection time and packing time of each cycle can be monitored by measuring the vibration signal of the mold. Also, it was confirmed that the level and trend of process variables such as the injection speed, maximum injection pressure, and packing pressure can be evaluated as the change of the mold vibration during injection molding.

파랑하 세장형 파일 주변의 국부세굴 방지대책

이준한 ( Jun Han Lee ),김경호 ( Kyoung Ho Kim ) 충북대학교 건설기술연구소 2015 建設技術論文集 Vol.34 No.1

파일 주변에 발생하는 세굴을 감소시키는 방법은 크게 1)세굴에 대한 해저 지반의 저항력을 증가시키는 방법과, 2) 세굴을 일으키는 요인(하강류, 말굽형 와류, 배후류 등)의 흐름을 차단함으로서 세굴 유발능을 감소시키는 두 가지 방법으로 대별된다. 본 논문에서는 파일에 원형 반사판을 설치하여 접근 흐름의 하강 유속을 감소시켜 세굴을 억제하는, 후자의 방법에 대하여 실험적 연구를 수행하였다. 사용된 파는 주기와 파고를 각각 달리하는 정현파를 이용하였고, 세굴 방지공은 방지공의 간격파 부착되는 방지공익 개수를 변화시키며 감소 효율을 측정하였다. 측정된 감소공의 각각의 효율파 KC 수와의 상관성을 검토하여 최적화된 방지공의 구성을 분석하였다. 실험결과, 평균 감소율은 36.8%였으며, 가장 효과적인 세굴방지공은 두께와 간격비가 0.25일 때,평균 감소율이 52.3%였다. There are two methods to protect the damage of the scour around a pile. One is the method of increasing resistance of seabed, and another is that of controlling flow causing scour such as down flow, horseshoe vortex and lee-wake vortex. The former is to place protecting layer using riprap or tetrapod around a pile. The latter is to install protection devise. Experiment of the reduction of scour around a pile using protection wing are carried out under regular wave. Experiments are performed with the variation of the breadth and interval of the protection wing, wave periods(T) and wave heights (H). The each experiment shows that protection reduces the scour depth. Using the experimental results, combination of breadths and intervals the protection wing is found. Finally, the correlations of relative scour depth and KC number were analyzed. The average reduction of the scour depth by the protection wing is 36.8%. The breadth - interval ratio of protection wing was found to be 0.25 for the best combination, in which average scour depth reduction was 52.3%.

국내외 지사벽지 브랜드의 시각적 표현 비교연구

이준한,김선미,Lee, Joonhan,Kim, Sun Mee 한국패션비즈니스학회 2017 패션 비즈니스 Vol.21 No.4

Paperweave wallcoveing is necessary to develop new designs based on the analysis of global trend and reflection of Korean traditional image to improve commercial value in the worldwide market. The purpose of this study was to understand design trend and share valuable data by product analyzing of major paperweave wallcovering brands - Yeomyung (Korea), Phillip Jeffries (USA) and Omexco (Belgium). In the dominant color, the largest proportion is YR. Analysis of each brand color, Omexco is using the widest range of colors, the colors of each brand uses an exclusive of its own brand compared to other brands are Green (Yeomyung), Blue (Phillip Jeffries), Red (Omexco). The number of colors, Yeomyung and Philip Jeffries have a high ratio of bi-color, Omexco is revealing various color expression methods such as 55% solid color, two or three multi-color are each half of the balance. Analysis of weaving, Yeomyung has a high ratio of balanced plain, at number of mixture, Yeomyung and Phillip Jeffries are using mostly paper-yarn but Omexco is using multi-mixture materials in some part of theirs. Regarding analysis of finishing, all three brands are mostly selling unfinished paperweave wallcovering but some solid coated are appearing at Yeomyung and Omexco. Yeomyung has more foil transfer compared with the other brands, Phillip Jeffries has some digital printed products.

반응성염료를 이용한 스트링벽지 패딩염색에 관한 연구

이준한 ( Joonhan Lee ),강영웅 ( Youngwoong Kang ),김선미 ( Sunmee Kim ) 한국패션비즈니스학회 2017 패션 비즈니스 Vol.21 No.2

A string wallcovering is a kind of textile wallcovering which is made of cellulose fiber yarn laminated on base paper. Compared with normal paper or PVC wallpaper, a string wallcovering is preferred continually in the interior design market, as it is not only environmentally friendly but it also has less cost on mass production without the weaving process and has a natural visual effect, excellent functionality such as thermo keeping, permeability, sound absorption. However, in the dyeing process, it is not appropriate to use plenty of energy such as water, electricity, steam or chemicals considering the environmental trend and the government policy plenty of energy such as water, electricity, steam or chemicals. Currently, a string wallcovering is made of raw white yarn and padding with direct dye or pigment which includes toxic elements, especially the use of direct dye is restricted in a part of the developed country due to inclusion of azo. In this study, we researched dyeing based on cold pad batch dyeing of a string wallcovering with reactive dyestuff. The peel strength and bending depth test confirmed that the optimum adhesive type and spread amount improved the water resistance of the string wallcovering. Also, pad batch dyeing with optimum reactive dyestuff enhanced the color fastness to light and rubbing in dry and wet conditions. Additionally, for improvement of color fastness to rubbing in a wet condition, the additional treatment finishing without soaping process which is used water. The results of this study can be used as basic data for environmentally friendly and energy saving of the textile wallcovering.

일반논문 : 박근혜 정부 3년차 유권자의 복지태도

이준한 ( Jun Han Lee ) 민주사회정책연구원 2015 민주사회와 정책연구 Vol.28 No.-

이 논문은 박근혜 정부 3년차에 즈음하여 증세 없는 복지와 선택적 복지 및 관련 조세정책에 대한 유권자의 태도를 조사한다. 여기에서는 박근혜 정부가 출범한지 꼭 2년이 되는 2015년 2월에 실시되었던 한 설문조사자료를 통계적으로 분석한다. 일반적으로 개인의 복지태도에 영향을 주는 요인은 자기이익의 극대화, 계급성, 그리고 사회적 연대의식 등 세 가지가 있다. 여기에서는 다른 무엇보다 자기이익의 극대화라는 이른바 경제적 인간 모델에 기초하여 박근혜 정부 3년 차에 보이는 유권자의 복지태도를 통계적으로 살펴본다. 그 결과 이 논문에서는 먼저 한국의 유권자가 대체로 박근혜 정부의 증세 없는 복지라는 공약과 복지관련 조세정책에 대하여 불만족하고 있다고 확인한다. 그 다음으로 이 논문에서는 한국의 복지태도가 개인의 자기이익의 추구라는 요인에 영향을 받는다는 증거를 발견한다. This essay evaluates the individual`s attitudes towards the Park Administration`s welfare policies and related tax policies in 2015. This study employs a survey data set assembled in February 2015, exactly two years after the inauguration in office. Generally speaking, the factors that have impacts on the individual`s welfare attitudes are the individual`s self interests, class, and social norms and values. Based on the Homo ecomicus model, this research statistically tests the hypothesis that the self interests have shaped individual`s attitudes towards the Park Administration`s welfare policies. As a result, this study finds that Koreans appear not to be satisfied with the Park Administration`s welfare policies. In addition, individual`s welfare attitudes are likely to be affected by her own self interests in Korea.

한국의 투표 인센티브제에 대한 평가

이준한 ( Jun Han Lee ) 서강대학교 사회과학연구소 2010 社會科學硏究 Vol.18 No.1

한국의 선거주기와 대통령 소속정당의 선거이득

이준한(Junhan Lee) 한국정당학회 2008 한국정당학회보 Vol.7 No.2

이 논문은 1987년 이래 치러진 한국의 국회의원선거와 지방선거에서 선거의 시점에 따라 나타나는 대통령 소속정당의 선거이득을 체계적으로 분석한다. 이를 위하여 이 논문은 먼저 선거주기와 선거이득의 관계에 대한 선행연구에 관하여 간단하게 검토한다. 그 다음으로 이 논문은 민주주의 시대 한국의 모든 선거에서 선거의 시기와 선거이득 사이의 관계를 구체적으로 하나씩 분석한다. 마지막으로 이 논문은 연구결과를 요약하고 결론을 도출하며 이론적인 함의를 제시한다. 이 논문에서 주의할 것은 먼저 이 논문은 국회의원 선거결과의 의석점유율과 지방선거의 선거결과에 초점을 맞춘다는 점이다. 그 다음으로 이 논문은“다른 조건이 비슷하다고 간주(with other things being equal)”하고 선거의 시점과 대통령 소속정당의 선거이득 사이의 관계에서 일정한 경향이 발생하는지 규명한다는 사실이다. This essay ascertains the relationship between electoral cycles and electoral advantages in Korea after the democratic transition in 1987. Generally speaking, presidential party’s electoral gains are expected in the concurrent elections and the electoral surges are likely to decline in the mid-term elections. As time goes, voters are disillusioned. Thus, this essay firstly reviews the literature relevant to the issues under study. Then, this study investigates the shapes and contours of presidential party’s electoral success in the post-democratic non-concurrent elections in Korea. This essay focuses on the actual outcomes of the National Assembly and the Regional elections and the relationship between the electoral cycles and presidential party’s gains in the respective elections, assuming with other things being equal. This study concludes that the Korean case appears to fit the general patterns.

지방정부와 권력분점

이준한(Junhan Lee) 인천대학교 인천학연구원 2012 인천학연구 Vol.17 No.-

이 논문은 지방자치 수준에서 분점정부의 출현이 지방정부에 대하여 일으키는 정치적 효과에 대하여 평가하고 인천의 맥락에서 비교하는 것이다. 첫째, 이 논문은 분점정부의 일반적인 정의, 특징, 발생의 원인 등에 대한 선행연구 결과를 간단하게 고찰한다. 둘째, 이 논문은 한국에서 지방수준의 분점정부가 출현하는 원인과 배경에 대하여 분석해본다. 셋째, 이 논문은 한국의 지방정부 수준에서 나타나는 분점정부의 유형과 각각의 정치적 효과를 평가해본다. 넷째, 이 논문의 연구결과를 요약하고 그 정치적 함의를 인천의 맥락에서 정리해본다. 예상과 달리 이 논문에서는 2010년 지방선거 결과 등장한 권력의 분점체제에서 극단적인 대결 대신 ‘타협과 중도의 방식’으로 수렴되는 현상을 찾았다. This essay evaluates and compares the political effects of divided governments at the levels of local governments between 1991 and 2010 in Korea. To accomplish this goal, this piece, first, reviews the definitions, characteristics, and sources of divided governments with the relevant previous research. Second, this study analyzes the sources of the emergence of divided governments at the local levels. Third, this essay develops the types of divided governments and evaluates the performances of them at the local levels and with the local-central governments relations. The final section summarizes the implications of this study. On the contrary to our expectations, the divided governments formed as a result of the 2010 local elections, have not ushered into severe gridlock situations at the local levels and with the local-central governments relations. Instead, the divided governments appear to have taken a third way, in such a way to bargain within the beltway thus far.

라틴아메리카의 결선투표제에 대한 연구

이준한(Lee, Junhan) 한국라틴아메리카학회 2016 라틴아메리카연구 Vol.29 No.2

This study reviews the two-round systems in Latin America. To be more specific, it is necessary to compare the theories and the realities of the two-round systems. As a result, this research finds that the two-round systems appear to exert a limited impact on improving the legitimacy and representativeness of the victors. First, voter turnout is more likely to decrease in the second round of voting. Second, however, the first runner-ups are more likely to remain at the same place rank in the second round. Third, in only 22.72% of the cases, the final victor was the candidate who had also taken first place in the first round, concurrent with increasing voter turnout. Fourth, in 18.18% of the cases, the final winner was not the candidate who had taken first place in the first round, concurrent with an increase of voter participation. Fifth, in 50.00% of the cases, the first place winner remained the same, concurrent with decreasing voter turnout. Finally, in four elections out of 44 cases (9.09%), the first runner-up became the final victor, concurrent with lower voter participation.

Spacer의 물질에 따른 nanowire feedback-FET의 성능 변화

이준한(Junehan Lee),신창환(Changhwan Shin) 대한전자공학회 2021 대한전자공학회 학술대회 Vol.2021 No.11