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K/Ka 대역에서의 LTCC를 이용한 송수신 겸용 L형태 광대역 원형 편파 안테나
오민석,천영민,김성남,이종문,표철식,최재익,천창율,Oh Min-Seok,Cheon Yung-Min,Kim Sung-Nam,Lee Jong-Moon,Pyo Cheol-Sig,Choi Jae-Ick,Cheon Changyul 한국전자파학회 2004 한국전자파학회논문지 Vol.15 No.9
The TX/RX broadband L-type circular polarization antenna using LTCC(Low Temperature Co-fired Ceramic) for satellite communication at K, Ka band(20~21 GHz/30~31 GHz) has been presented. This antenna has been analyzed in compensation for LTCC with relative permittivity 5.2 and could have been integrated with RF component. Also antennas on LTCC enable :o reduce loss of RF system due to integrate with RF circuits and to light weight, and thus, generally one can reduce size of the RF system. As the geometry of this antenna presented is made simple by L type of monopole antenna, it is easily manufactured by LTCC progress and enables to reduce loss.
오민석,김수관,김학균,문성용,Oh, Min-Seok,Kim, Su-Gwan,Kim, Hak-Kyun,Moon, Seong-Yong 대한악안면성형재건외과학회 2007 Maxillofacial Plastic Reconstructive Surgery Vol.29 No.1
This report constitutes a 7-year study of facial fractures based on a series of 616 patients who were treated for facial fractures as in-patients at Chosun University Dental Hospital between 1998 and April 2005. The following results were obtained : 1. The ratio of men to women was 5 : 1. 2. The major etiological factors were falls (36.2%), traffic accidents (23.4%), punches (18.1%), sports (8.3%), and accidents related to work (2.8%). 3. They were most frequent in the second (28.8%), first (26.6%), and third (12.3) decades, in that order. 4. The sites of frequent mandible fracture are the symphysis (32%), left mandibular angle (25.3%), and right mandibular angle (10.9%). 5. The most frequent maxillary fractures were zygomatic fractures (46.4%), Le Fort I fractures (28.8%), and Le Fort II (12.0%) fractures.
효율적인 휴리스틱 계산 처리를 위한 가중치 기반의 선수행 A<sup>*</sup> 알고리즘
오민석,박성준,Oh, Min-Seok,Park, Sung-Jun 한국게임학회 2013 한국게임학회 논문지 Vol.13 No.6
경로 탐색은 인공지능의 매우 중요한 요소 중의 하나이며, 여러 분야에서 두루 쓰이는 과정이다. 경로 탐색은 매우 많은 연산이 필요하기 때문에 성능에 매우 중대한 영향을 미친다. 이를 해결하기 위해서 연산량을 줄이는 방식의 연구가 많이 진행되었고, 대표적으로 A* 알고리즘이 있으나 불필요한 연산이 있어 효율성이 떨어진다. 본 논문에서는 A* 알고리즘 중 연산 비용이 높은 노드 탐색 수 등 연산량을 줄이기 위해서 가중치 기반의 선수행 A* 알고리즘을 새롭게 제안한다. 제안한 알고리즘의 효율성을 측정하기 위해 시뮬레이션을 구현하였으며, 실험 결과 가중치를 이용하는 방법이 일반적인 방법보다 약 1~2배 높은 효율을 보였다.
오민석,송태원,윤일지,Oh, Min-Suk,Song, Tae-Won,Yoon, Il-Ji 한방비만학회 2001 한방비만학회지 Vol.1 No.1
Objectives: We want to understand body composition and states of obese patients and the clinical studies of obesity attribute to Dept. of Oriental Rehabilitation Medicine. Methods : The clinical studies were done on 42 cases of obese patients who were treated by obesity clinic in Dept. of Oriental Rehabilitation Medicine Dae-Jeon Oriental medical hospital in Dae-Jeon University from May 2000 to September 2000. We checked body composition using Inbody3.0. Results : Sexual ratio on this report is 1:4.98(male: female). Abnormal eating is Major cause of obesity that has caused orthopedic disease. Increasing of BMI, fluid, protein and mineral mass decrease.
Fault Management in Crossbar ATM Switches
오민석,Oh Minseok Korea Information Processing Society 2005 정보처리학회논문지 C : 정보통신,정보보안 Vol.11 No.1
다중채널 스위치는 ATM (Asynchronous Transfer Mode)로 널리 사용되는 스위치 구조이며, 스위치의 내부에 장애에 대한 내성(tolerance) 을 구현할 수 있는 것으로 알려져 있다. 예를 들어, 하나의 다중 채널 그룹에 속하는 링크에 장애가 있을 경우, 장애 링크로 통과하려는 트래픽을 여분의 링크가 책임을 질 수 있게 할 수 있다. 스위치 소자에 발생하는 장애는 ATM 셀을 잘못 라우팅하거나 출력단에 도달하는 셀의 순서를 뒤바꾸게 할 수 있다. 본 논문에서는 다중 채널 크로스바 ATM 스위치에 적용할 수 있는 두 가지의 장애 위치 확인 알고리즘을 제안한다. 첫 번째로 제안하는 최적 알고리즘은 시간적으로 최상의 성능을 보여주지만, 계산상으로는 복잡하게 되어 결과적으로 실제 구현이 어려울 수 있다. 이러한 문제점을 해결하기 위해 최적의 알고리즘보다는 계산상으로 보다 효율적인 온라인 알고리즘을 제안한다. 두 알고리즘의 성능은 시뮬레이션을 통해 검증한다. 온라인 알고리즘은 랜덤 트래픽 및 버스티(bursty) 트래픽에 대해 거의 최적에 가까운 성능을 보여 준다. 한편, 제안된 알고리즘으로 장애론 찾아낼 수 없는 경우가 있는데, 그에 대한 열거 및 원인을 제시한다. 끝으로 장애 위치 확인 알고리즘을 이용해서 찾은 장애를 우회하기 위해 행과 연을 추가하는 장애 복구 알고리즘을 제안하다. The multichannel switch is an architecture widely used for ATM (Asynchronous Transfer Mode). It is known that the fault tolerant characteristic can be incorporated into the multichannel crossbar switching fabric. For example, if a link belonging to a multichannel group fails, the remaining links can assume responsibility for some of the traffic on the failed link. On the other hand, if a fault occurs in a switching element, it can lead to erroneous routing and sequencing in the multichannel switch. We investigate several fault localization algorithm in multichannel crossbar ATM switches with a view to early fault recovery. The optimal algorithm gives the best performance in terms of time to localization but it is computationally complex which makes it difficult to implement. We develop an on-line algorithm which is computationally more efficient than the optimal one. We evaluate its performance through simulation. The simulation results show that the Performance of the on-line algorithm is only slightly sub-optimal for both random and bursty traffic. There are cases where the proposed on-line algorithm cannot pinpoint down to a single fault. We enumerate those cases and investigate the causes. Finally, a fault recovery algorithm is described which utilizes the information provided by the fault localization algorithm The fault recovery algorithm providesadditionalrowsandcolumnstoallowcellstodetourthefaultyelement.
오민석(吳玟錫) ( Oh Min-seok ) 한국어문교육연구회 2020 어문연구 Vol.48 No.1
In this paper, we have looked at the grammatical characteristics that would be considered in defining what Korean contronymy is, internal-contrariness in a single linguistic unit, word, phrase, sentence. Looking at the list of preceding studies, we reconfirmed that contronymy is polysemy and through “jeon-bu(full)-jeon-mu(nothing)” and “bamnat(night-day)”, “gilhyug(good-ill luck)” the contronymy should not be internally analyzed for a single linguistic unit. It also confirmed that in order to define contronymy, each-opposite meanings in a single linguistic unit should be looked at through “uyeon-chanh-da (being accidental)” and “eojjup-janh-da (clumsy)”, and that the contradiction should be checked not in the form as ‘-잖/찮’ but in the meaning of words. We looked at the contagion from negative predicate and concurrency with “billida(rent)”-type words as the basis for the formation of controymy. By confirming the existence of one-time contradictory words at the discourse level, such as “jugda(die)”, “jugida(kill)” and “jal-hada(do well)” which were not paid attention in preceding studies, we will be able to understand the Korean contronymy in full.
중풍후유증 환자 관리를 위한 프로그램 개발 연구 -한방 재활의학 및 간호를 중심으로-
오민석 ( Oh Min-Seok ),송태원 ( Song Tae-Won ),이철완,김태임 ( Kim Tae-Im ),이강이 ( Lee Kang-Yi ) 한방재활의학과학회 1997 한방재활의학과학회지 Vol.7 No.1
한방재활의학 및 간호를 중심으로 중풍후준증 환자관리에 대하여 연구한 결과 다음과 같은 결론을 얻었다.1.현행 실시되고 있는 재활치료의 대부분이 육체적인 재활치료 즉 운동치료에 중점을 두고 있는 현실에 비추어 볼때 심리적이고 정신적인 재활치료의 필요성을 느끼게 되었다.2.심리적이고 정신적인 중풍후유증 환자 관리에는 의사 뿐만 아니라 간호파트와의 협조체제가 절대적으로 필요한 것으로 사료된다.3.한방재활의학의 영역에서 음악·방향·향기·색깔·이미지·자석·소리·기공도인요법 등은 정신적인 재활파트부분으로써 매우 기대되는 치료방법들이다.4.음악·방향·향기·색깔 등 이학적 자극인자로 간호부분관리에 응용하면 보다 효과적인 간호관리 프로그램이 개발될 것으로 사료된다.5.한방재활의학과 간호파트와의 관계는 매우 밀접한 것으로 나타났으며 더욱 발전시키면 중풍후유증 환자 관리에 있어 새로운 프로그램이 보다 많이 제시될 수 있을 것으로 사료된다.
오민석(M. S. Oh),양경욱(K. U. Yang) 유공압건설기계학회 2019 유공압건설기계학회 학술대회논문집 Vol.2019 No.6
In the case of ships, fuel consumption varies depending on external load power such as a viscous resistance, a wave resistance, and an air resistance. Therefore, it is a parameter that must be considered when calculating fuel consumption as the ship is under sailing. The external load force is determined by the length, width, depth, draft, and deadweight of the ship and the speed of the ship. Since this major parameter affects the magnitude of the external resistance applied to the ship, it is calculated in consideration of the external load power and the speed of the ship in order to calculate the power of the engine used in the ship. In this study, the engine power required for the maximum speed roll operation of the ship was calculated and the engine fuel consumption was calculated considering the load rate (speed) of the ship.
Cu-7Al-2.5Si 합금의 기계적 및 내식특성에 미치는 열처리 효과
오민석(Min-Seok Oh),이명훈(Myung-Hoon Lee),이성렬(Syung-YUl Lee),김윤해(YUn Hae Kim),문경만(Kyung-Man Moon) 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.6
Recently, the fuel oil of diesel engines of marine ships is being changed to heavy oil of low quality as the oil price is becoming higher and higher. Therefore, it is very important to purify the heavy oil which have a large amounts of impurities such as sediments, oxide compound and water etc. in order to operate smoothly a diesel engine with perfectly purified oil. Moreover, the spiral gear attached at the motor of the purifier which plays an important role to purify the heavy oil is also exposed to severe operation condition due to the purification of the heavy oil. Thus, the material of the spiral gear needs to a higher mechanical strength, wear and corrosion resistance. In this study, the heat treatment with constant holding time at temperature of 500℃ was carried out to the metarial of Cu-7Al-2.5Si series as centrifugal casted, and those properties for its material were inverstigated with observation of the microstructure and with electrochemical methods, such as measurement of corrosion potential, cathodic and anodic polarization curves, cyclic voltammogram, and impedance etc. in natural seawater solution. The α, β′ and γ2 phases were observed at the microstructure of its material as centrifugal casted in spite of no heat treatment due to quenching effect of a spin mold. However, their phases, that is, β′ and γ2phases were decreased gradually with heat treatment, in particular, the degree of decrement of their phases tended to increase with increasing the holding time at a constant temperature. The corrosion resistance was also improved with the heat treatment compared to no heat treatment, furthermore, the holding time is longer and longer, its corrosion resistance exhibited a better tendency. In addition, when the holding time was 48hrs, its corrosion current density showed the lowest value. The pattern of similar to a pitting corrosion was observed greatly at the its material surface in the case of no heat treatment, which is considered that γ2 phase of the grain boundary was corroded preferentially as an anode. However, the pattern of general corrosion exhibited increasingly due to decreasing the γ2 phase with heat treatment. Consequently, it is suggested that the metarial of Cu-7Al-2.5Si series can be improved with the heat treatment for the mechanical property and corrosion resistance.