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지반 보강과 배수를 위한 이중기능 록볼트 성능 검증에 관한 연구
정영훈,김두래,김경철,신종호,Jung, Young-Hoon,Kim, Doo-Rae,Kim, Kyeong-Cheol,Shin, Jong-Ho 한국터널지하공간학회 2018 한국터널지하공간학회논문집 Vol.20 No.5
록볼트는 지하굴착 중 불연속 암반을 보강하기 위하여 흔히 사용하는 대표적인 지보재 중의 하나이다. 용수가 많은 현장에서는 굴착 시공성을 개선하고 록볼트의 정착효과를 증진하기 위하여 별도의 Drain pipe 설치하게 된다. Drain pipe는 배수경로를 제공하여 작업성 개선에 효과적이지만 지반보강효과를 기대하기 어렵고, 다수 설치 시 불연속 암반의 교란을 증가시키며, 공사비 증가 요인이 된다. 이러한 문제를 개선하기 위하여 암반의 보강과 배수를 겸한 Dual purpose rockbolt (DPR)를 개발하였다. DPR은 신속하고, 경제적으로 암반의 역학적 수리적 안정성을 개선할 수 있었다. FRP (유리섬유 보강 플라스틱)와 steel을 이용한 2가지 DPR을 개발하여 역학적 수리적 성능을 검토하였고, 시공성과 안정성을 분석하였다. Rockbolt is one of the most common supports used to reinforce discontinuous rock during underground excavation. Extra drain pipes are installed to improve excavation workability and the anchorage of rockbolts in water bearing ground. The drain pipe is effective in improving the workability by providing drainage path, but it is difficult to expect the reinforcement effect, increasing disturbance of the discontinuous rock mass and the construction cost. To solve this problem, dual purpose rockbolt (DPR) has been developed for the reinforcement of rock and the drainage of ground water. DPR was able to improve the mechanical and hydraulic stability of the rocks quickly and economically. Two kinds of DPRs using FRP (Fiber Reinforced Plastic) and steel were investigated for the mechanical and hydraulic performance. Also, the workability and stability of DPR were analyzed.
정영훈(Jung young hoon) 한국노동법학회 2009 노동법학 Vol.0 No.31
The proviso of Paragraph 1 of Article 94 the Labor Standards Act in effect provides that modification the Rules of Employment unfavorably shall require the consent of a majority of the union members if the place of business has a trade union consisting of a majority of its workers, and the consent of a majority of its workers if the place of business does not have a trade union consisting of a majority of its workers, and that unfavorable modifications made to the Rules of Employment in violation of such provision shall be null and void and shall not be binding on the workers. Even though such methods for modifying the Rules of Employment unfavorably may represent an improvement, if looked at from the perspective of the principle of even decision on the working conditions, such methods harbor a controversial point wherein the interests of the minority of the workers opposed to such modification are not taken into consideration by ascribing the validity of the unfavorable modification to the rule of the consent of the majority. The purpose of this study is to argue that it is essential to supplement the procedural requirements under the provision of Article 94 of the Labor Standards Act with an examination of the procedures and contents with the foregoing controversial point in mind. Above all, with respect to the examination of the procedures, I, at the suggestion of the relevant arguments in Japan, have indicated that the labor union consisting of a majority of the workers shall have the duty of fair representation and the duty of integration of opinions, and the employer shall have the duty to listen to the opinions and the duty to integrate the opinions. Next, with respect to the examination of the contents, I, at the suggestion of the relevant arguments in Germany, have presented the justification and feasibility of the examination of the contents, observing that disadvantageous amendment to the Rules of employment under the Labor Standards Act in effect is dependent on the decision of others. This study is of the trial theory nature arguing that the conflicts of interest between the majority and minority of the workers involved in unfavorable modification to the rules of employment shall be solved by supplementing it with the examination of the procedures and contents other than by meeting the requirements under the proviso of Article 94 of the Labor Standards Act in effect, and is limited in that it has failed to deal with specifically how the procedures and contents shall be examined. However, given that the rules of employment under the Labor Standards Act stipulate almost all of the working conditions of the workers, is approved by the majority of the workers and thus can hardly secure the propriety of the procedures and contents, the issues presented in this study may be worthy of serious review until the time when the legislative perfection of the legislative system of the rules of employment is attained.
파라메트릭 디자인을 이용한 듀얼 클러치 변속기용 자속집중형 동기 전동기 설계
정영훈(Young-Hoon Jung),박권일(Kwon-Il Park),임명섭(Myung-Seop Lim),홍정표(Jung-Pyo Hong) 한국자동차공학회 2016 한국자동차공학회 학술대회 및 전시회 Vol.2016 No.11
This paper proposes a design process of the Concentrated Flux type Synchronous Motor (CFSM) satisfying the same performance of the conventional Surface-mounted Permanent Magnet Synchronous Motor (SPMSM). The rotor shape producing the maximum air-gap flux is determined under the same volume condition and the radius of rotor is increased to satisfy the same air-gap flux of the conventional motor. The radius of rotor is determined by parametric design. The width of teeth and yoke is recalculated considering saturation of the stator after the rotor is designed. The joint of the rotor that is composed of the magnetic core and non-magnetic part is designed by parametric design. Finally, the characteristics of the designed CFSM is compared with those of the SPMSM.