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급속건조법(急速乾燥法)에 의한 은수원사시재(材)의 인공건조(人工乾燥)스케쥴 개발(開發)
이형우,Lee, Hyoung-Woo 한국목재공학회 1987 목재공학 Vol.15 No.2
A study was conducted to determine the kiln drying schedule for hydrid aspen, This kiln drying schedule was found by oven drying method and developed by pilot testing of 2.0cm, 2.5cm, 3.0cm-thick green lumber. The results of this study were as follows: 1. Kiln drying schedule developed by oven-drying method was $T_{12}-E_5$ for 2.5cm-thick green lumber. 2. Drying times for 2.0cm-thick green lumber(127.0 percent moisture content) to 7.3 percent moisture content, for 2.5cm-thick green lumber(95.0 percent moisture content) to 9.7 percent moisture content, and for 3.0cm-thick green lumber(118.5 percent moisture content) to 10.0 percent moisture content were 45 hours, 45 hours, and 54 hours, respectively. 3. Drying rate from 90 to 10 percent moisture content of 2.5cm-thick lumber was about 0.7 times faster than that of 2.0cm-thick lumber and about 1.1 times faster than that of 3.0em-thick lumber. 4. End checks for 2.0cm-, 2.5cm-, and 3.0cm-thick green lumber occurred 95, 74 and 100 percent moisture content, respectively and reached maximum amount in 53, 41, and 60 percent moisture content, respectively. 5. No surface check and no honeycomb occurred. 6. Cupping and collapse slightly occurred and the quality of dry lumber was first.
집적영상에서 효율적인 물체움직임 추정 및 차 영상 기법을 이용한 서브영상의 고속 압축
이형우,김은수,Lee, Hyoung-Woo,Kim, Eun-Soo 한국정보통신학회 2012 한국정보통신학회논문지 Vol.16 No.12
본 논문에서는 서브영상(sub-image)에 MSE(mean square error)기반의 블록정합 알고리즘인 TSS (three-step search)와 FS (full search)를 복합적으로 적용함으로써 물체움직임을 고속, 정밀하게 추정 보상하고, 차 영상 기법을 통해 공간적 중복데이터를 제거한 잔여영상(residual image)을 고속 압축할 수 있는 새로운 기법을 제시하였다. 즉, 제안된 기법에서는 픽업된 영상 간의 유사성을 향상시키기 위하여 픽업된 요소영상으로부터 서브영상을 재합성한 뒤, TSS 기반의 MSE 알고리즘을 사용하여 전 물체영역을 대상으로 가능한 물체영역 만을 고속으로 찾은 다음, 그 가능한 물체영역에 정밀한 FS 탐색 알고리즘을 적용하여 물체영상의 정확한 움직임 벡터를 추정하여 보상하게 된다. 또한, 움직임이 보상된 물체영상에 차 영상(difference image) 기법을 적용하여 서브영상 간의 공간적 중복 데이터를 제거한 잔여영상을 얻게 되고 이는 MPEG-4 알고리즘을 통해 최종적으로 압축되게 된다. 실험결과, 제안된 기법은 기존방식에 비해 영상 압축률은 그대로 유지하면서 프레임 당 압축시간이 214% 향상됨을 보임으로써 제안된 기법의 실제 응용 가능성을 제시하였다. In this paper, we propose a novel approach to effectively compress the sub-images transformed from the picked-up elemental images in integral imaging, in which motion vectors of the object in each sub-image are fast and accurately estimated and compensated by combined use of MSE(mean square error)-based TSS(tree-step search) and FS(full search) schemes. This is, the possible object areas in each sub-image are searched by using the fast TSS algorithm in advance, then the these selected object areas are fully searched with the accurate FS algorithm. Furthermore, the sub-images in which all object's motion vectors are compensated, are transformed into the residual images by using the difference image method and finally compressed with the MPEG-4 algorithm. Experimental results reveal that the proposed method shows 214% improvement in the compression time per each image frame compared to that of the conventional method while keeping the same compression ratio with the conventional method. These successful results confirm the feasibility of the proposed method in the practical application.
이형우,Lee, Hyoung-Woo 한국마린엔지니어링학회 2006 한국마린엔지니어링학회지 Vol.30 No.8
A new CVT, the inner spherical traction CVT (ISCVT) is introduced. Transmission of the most scooters is the self-controlled variable pulley-belt type of CVT having some disadvantages in the fuel consumption and the limitation of the transmittable power due to the slippage between the belt and pulley. Unlike this, ISCVT controlled directly by driver is more efficient and the contact mechanism having the same line of contact normal of the spherical rotors of different radii on common center causes that the power density and torque capacity are remarkably improved. The prototype with the specifications of 50cc scooter is designed and tested.
이형우 ( Hyoung-woo Lee ),장상식 ( Sang-sik Jang ) 한국목재공학회 2022 한국목재공학회 학술발표논문집 Vol.2022 No.2
A truss is structure whose members are connected and arranged in such a way that they are subjected primarily to axial loading. The truss structure has the advantage that it can be used with a long span because the structure distributes the applied force well and the load is transmitted only in the axial direction of the members. Truss manufactured by using timber have more advantage than truss made from other material. In this study, evaluated bending properties of parallel chord truss composed of timber chord and steel web members Specimens were tested in accordance with KS F 2150. From the test results, there is no difference in the bending strength of the truss structure according to the length of the specimen and when installing steel web members successively, bending strength was about 2 times higher than when installing steel web members alternately. When comparing the steel web member of S. Co and P Co, there was no difference in the bending strength for truss structure of the two company.
이형우 ( Hyoung Woo Lee ) 한남대학교 사회과학연구소 2015 사회과학연구 Vol.24 No.-
우리는 냉전이 종식된 21세기에도 여전히 정치 이념적 논쟁이 이슈가 되는 정치현실에 살고 있다. 진보와 보수의 대립은 세계 다른 어느 나라보다 심각한 수준이다. 이러한 맥락에서 본 연구에서는 우리나라 진보적 대학생들의 안보, 정치, 사회에 대한 인식이 일부 보수층이 우려하는 바대로 위험한 정도인지를 알아보려 한다. 이들 젊은 대학생들은 우리나라의 미래를 의미하는 세대로서, 이들의 안보, 정치, 사회인식이 국가의 미래를 논함에 있어 매우중요하다는 점에서 본 연구는 의미가 있을 것이다. 본 연구의 결과는 다음과 같다. 물론 진보적 대학생들이 보수적 정치성향의 대학생들보다 북한을 위협으로 느끼는 정도와 미국을 우방으로 생각하는 정도가 상대적으로 약할지라도, 그 평균값을 보면, 진보적 성향을 가진 대학생들조차도 대체적으로 북한을 위협적으로 느끼고 우방국인 미국을 긍정적으로 인식하는 것으로 드러났다. 또한, 우리나라 남성들이 대부분 거치는 군대에서의 안보교육의 효과가 본 연구 결과 유의미한 것으로 나타났으며, 이를 통해 우리나라 안보교육의 문제가 크다는 일부의 우려는 기우에 불과한 것일 수 있다는 결론을 내릴 수 있다. 우리의 이러한 연구결과는 지나친 색깔 논쟁보다는 진보와 보수 간의 정치적 사회적 화합이 중요함을 시사한다할 것이다. The ideological conflict is still prevalent in Korea in the 21 century even after the era of the cold war has come to an end decades ago. This study aims to examine young Korean college students’attitudes regarding the issues of national security, political situation, and their society. These young students are often perceived by the old generation as heavily influenced by the North Korean ideology. Hence it would be meaningful to examine their political and societal consciousness and attitudes to see whether they are really so. The results show that, although the extent to which they feel that the North Korea is the biggest threat to the South Korean national security is greater for those who belong to the right wing than the left wing, those of the left wing still tend to maintain similar beliefs and attitudes toward the North Korea. They also tended to perceive the U.S. as one of the closest allies. This tendency was stronger for those male students who served in the military. These results implies that the concern of the older generation that the young generation’s political attitudes are influenced by the North Korean ideology is questionable. It is suggested that such concern is groundless and only to undermine the possibility of sound political debate between generations.