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.

캡슐형 자동 화물 운송시스템 파이로트 개발

정영훈(Young-Hoon Jung),서상호(Sang-Ho Suh),김인복(In-Bok Kim) 한국유체기계학회 2018 한국유체기계학회 학술대회 논문집 Vol.2018 No.7

스마트폰으로 수집된 영상정보의 포인트 클라우드 처리와 이를 이용한 지형정보데이터 수집

정영훈(Jung, Young-Hoon),이경섭(Lee, Kyeong-Seop),김성민(Kim, Seong-Min),김태식(Kim, Taesik),정진만(Jung, Jin-Man),민홍(Min Hong) 대한토목학회 2020 대한토목학회 학술대회 Vol.2020 No.10

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.

파워 앰프용 히트싱크의 방열성능에 관한 연구

정영훈(Young Hoon Jung),이동렬(Dong Ryul Lee) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7

To find better performance of Heat Sink, in this research, different cases were analysed by changing number of slots and shape of fins. Round shape fins which have wide surface showed better heat transfer rate than Vertical fins. There were not big discrepancies between 1Slot and 2slots fins. Consequently, for better performance of Heat Sink, developments for widen surface and better material for high heat transfer rate are needed.

2영역 모델을 이용한 선박용 디젤기관의 NO 생성농도 예측에 관한 연구

정영훈(Young-Hoon Jung),최재성(Jae-Sung Choi) 한국해양대학교 해사산업연구소 2000 海事産業硏究所論文集 Vol.10 No.-

오늘날 대기오염과 지구 환경에 대한 관심이 고조됨에 따라 대기오염을 유발하는 배기 배출물에 대한 규제가 본격적으로 시작되면서 인체에 유해한 배기 배출물 즉 질소산화물 (NOx)과 미립자와 같은 유해배기가스의 저감을 위한 연구가 활발하게 진행되고 있다. 본 논문에서는 대형저속박용디젤기관의 NOx 발생에 관한 기초연구로서 연소실내의 연소과정에서 생성되는 NO 농도의 조성을 예측할 수 있는 프로그램을 개발하여 질소산화물의 배출농도를 정량적으로 예측하고, 예측결과와 박용엔진에서 실제 계측한 결과를 비교함으로써 정량적 예측방법에 관하여 검토하였다. Diesel engine is a major source of the air pollution. In general, the concentrations of these pollutants in diesel engine exhaust gas differ from values calculated assuming chemical equibrium. Thus the chemical mechanisms about these pollutions form are important in determining emission levels. In this study, the computer program has been developed to calculate the required thermodynamic properties of combustion products (10 spacies) for both equilibrium and non-equilibrium in cylinder for diesel engines. Nitric oxide emissions are calculated by using the extended Zeldovich Kinetic mechanism. By the results, the predictions show well the general trend in NO emission behaviour for Marine diesel engine when compared with experiment.

근대 한국에서의 ‘단군민족주의’

정영훈 ( Jung Young-hoon ) 한국민족운동사학회 2001 한국민족운동사연구 Vol.29 No.-

This article discusses the the problems related to the 'Dangun nationalism’ which has played a significant role in the Korean people's development as a nation as well as Korea’s modernization process and its pursuit of unification. ‘Dangun nationalism’ refers to a strong national consciousness, as well as ideological, political and cultural movements that have promoted unity and development based on a national identity which regards Korean people as 'descendants of Dangun’. ‘Dangun nationalism’ has a history much older than Samgukyusa(三國遺事) and Jewangungi(帝王韻紀) both of which provide early written accounts on the nation's foundation. Dangun Nationalism was somewhat subdued by the flunkeyism that characterized Korean relations toward China during the medieval age, but it was popularly restored in the 19th century and stimulate the Korean people’s patriotism and national consciousness. During the period of Japanese colonial rule, it played a central role in arousing public sentiments to resist foreign encroachment and attain independence. In the closing years of the Joseon dynasty, the populace began to embrace a growing consciousness that they were descendants of Dangun, which led to various developments, including the establishment of social organizations, related lo public awareness efforts and academic studies on ‘Dangun nationalism’. Notable among these campaigns were a religious movement spearheaded by Daejonggyo(大倧敎) and a nationalist academic movement led by Sin Chae-ho(申采浩). In Korea’s modem history, nationalism and modernization owe much to 'Dangun nationalism’ for their growth and acceptance. First, in the development process of the Korean people from a pre-modem nation lacking in national consciousness to a modem nation armed with a dynamic national consciousness, 'Dangun nationalism' were significant influences. Second, Dangun nationalism’ significantly contributed to bolstering Korea's capability to wage its struggle for national independence. Third, 'Dangun nationalism’ contributed to changing Korea's medieval and feudal structure to a modem democratic system Fourth, ‘Dangun nationalism' rendered both emotional and theoretical support to the movements for Korean national solidarity and independence following the Samil Independence Movement. Following the establishment of the Republic of Korea in 1948, ‘Dangun nationalism1 served as an institutionalized mechanism for national integration with the adoption of Gaecheonjeol(開天節) as one of the country's four major national holidays, hongikingan(弘益人間) as a guiding principle for education, and the Dangun era(檀紀) for official use. While ‘Dangun nationalism’ has since shown signs of decline in South Korea amid rapid Westernization and the prevalence of individualism and globalism, North Korea seems to continue to give it weight as a regime ideology. For the impending tasks of realizing the unification of North and South Korea, forming a commonwealth for the Korean race, establishing a refined Korean national identity, and renewing the moral integrity of the nation, the ‘Dangun nationalism’ still promises to play an essential role. As a valued resource of the nation, the Dangun nationalism’ will live on as long as the Korean people exist.

근로관계종료후의 경업금지의무에 관한 고찰

정영훈(Jung Young Hoon) 한국노동법학회 2009 노동법학 Vol.0 No.29

In order to discuss the Duty f non-competition, it is important to consider the validity of non-competition covenants, protection of business secrets under the Prevention of Unfair Competition Act, while taking into account their functions, roles and interrelationship. From this fundamental perspective, this study aims to consider the German legal system to come up with an interpretation to solve similar problems in the Japanese legal system. The characteristics of the German legal system on the confidentiality obligations of business secrets in post- employment context are: (1) The determining principle of protecting employees’ legitimate interests in the legal system of the confidentiality obligations of business secrets in post-employment context originated from the protection of business secrets under the Prevention of Unfair Competition Act 1896 and non-competition covenants under the commercial law in 1897. (2) The insufficient protection of business secrets under the Prevention of Unfair Competition Act is complemented by other sections of the Act and the law on illegal conduct under the Civil Code (BGB). The main principle is maintained to allow employees to use knowledge and capacity legitimately obtained during the employment without restriction in post-employment context. (3) There is an ongoing debate at a theoretical level on the post-employment validity of confidentiality obligations of business secrets. However, the principle clarified above in the legislative process of the Unfair Competition Act is still maintained. Thus it is normally recognised that employees’ legitimate interests in employment as to business secrets cannot be limited. Non-competition covenants in German Commercial Code(HGB) has the following significance and characteristics. (1) The German legislature, faced with the dilemma to protect corporate competitiveness and employees’ freedom of occupation, sought to protect the business secrets through the enactment of the Prevention of Unfair Competition Act at the same time minimising the validity and scope of non-competition covenants. (2) In the process of the prolonged deliberation and drafting of the permissibility and necessity of non-competition covenants, it became clear that the purpose and justification of the restriction of non-competition covenants is to protect customers and important property values such as business secrets. (3) The reform of commercial law in 1914 finally adopted a strict regulation which required financial consideration as an essential condition. It is because the legislature recognised the financial consideration as a preferable way of regulating non-competition covenants of the reciprocal nature and the most effective way to prevent the abuse of non-competition covenants by employers in terms of legal validity. In conclusion, based on the study of the German legal system, I suggest the interpretation as below: (1) As the scope and content of Duty of non-competition are varied, even provisions which do not prohibit employment at a different company in the same industry are capable of seriously limiting employees’ legitimate interests in freedom of occupation. Therefore, all agreements which attempt to limit employees’ freedom of occupation in post- employment context should be interpreted as non-competition covenants. This is the very reason why the German Commercial Code widely defines the concept of non-competition covenants. In this respect, the validity of the confidentiality obligations of business secrets should be determined according to the standards applied to determine the validity of non-competition covenants. (2) Before discussing the validity of non-competition covenants, it is necessary to examine whether a contract restricting employees’ freedom of occupation in post-employment context is valid in terms of the constitutional values. The importance of such consideration is clearly shown by the Ge

역물류 환경을 고려한 복수차고지 다용량 차량경로문제

정영훈(Young-Hoon Jung),김각규(Gak-Gyu Kim),이상헌(Sang-Heon Lee) 한국경영과학회 2012 經營 科學 Vol.29 No.1

In this paper, we deal with the dual-depot heterogeneous vehicle routing problem with simultaneous delivery and pick up(DH-VRPSDP) in reverse logistics. The DH-VRPSDP is a problem of designing vehicle routes in a day of given vehicle to minimize the sum of fixed cost and variable cost over the planning horizon. Each customer can be visited only once according to the service combinations of that customer. Due to the complexity of the problem, we suggest a heuristic algorithm in which an initial solution is obtained by changing the customer and the vehicle simultaneously and then it is improved. A performance of the proposed algorithm was compared to both well-known results and new test problems.

제체 상태 평가를 위한 동적 콘 관입시험과 평판재하시험 결과의 상관관계 분석

정영훈(Young-Hoon Jung),김성민(Seongmin Kim),임정열(Jeong-yeul Lim) 한국지반환경공학회 2018 한국지반환경공학회논문집 Vol.19 No.4

제체 재료의 다짐 불량에 의한 내부 침식은 국내 제방의 주요 붕괴 원인으로, 제방의 안전진단에 있어서 제체의 다짐 상태평가는 매우 중요한 점검 사항이다. 본 연구에서는 제체의 다짐상태 평가 시 동적 콘 관입시험의 현장 적용성을 검증하기 위해 대표적인 다짐평가 기법인 평판재하시험에 대해 상관관계를 분석하였다. 시험 부지의 지반 특성 및 토층 심도를 파악하기 위해 표준관입시험을 6회 수행하였다. 평판재하시험 15회, 동적 콘 관입시험 47회 수행 후 크리깅(Kriging) 기법으로 공간분포를 얻었다. 평판재하시험의 공간분포와 일정 관입깊이에서의 동적 콘 관입시험 공간분포 간의 피어슨 상관 계수를 계산하였다. 평판재하시험의 지지력과 관입 깊이 5cm, 10cm, 15cm에서의 동적 콘 관입시험의 타격횟수는 약한 양의 상관관계를 갖는 것으로 나타났다. The internal erosion due to poor compaction of the material was the main cause of collapse of the embankment in Korea. The assessment of the compaction state of the dam body was a very important check in the safety diagnosis of the embankment. In this study, the correlation between dynamic cone penetration test and plate loading test which is the most typical compaction evaluation technique was analyzed to verify the applicability of the dynamic cone penetration test in evaluating the compaction state of the dam body. The standard penetration tests were carried out six times to define soil properties and depth of the test site. The spatial distributions were obtained by the Kriging method after 15 times of plate loading tests and 47 times of dynamic cone penetration tests. The Pearson correlation coefficient between the spatial distribution of the plate loading test and the dynamic cone penetration test spatial distribution at the constant penetration depth was calculated. The load distribution in the plate loading test and the blow counts at penetration depths of 5 cm, 10 cm and 15 cm in the dynamic cone penetration test showed a weak positive correlation.