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      • 포항종합제철(浦項綜合製鐵) 강재품(鋼材品)의 연안수송(沿岸輸送)을 위(爲)한 PUSH-BARGE SYSTEM에 관(關)한 일고(一考)

        이병석,김훈철,Byeong-Seok,Lee,Hun-Cheol,Kim 대한조선학회 1974 大韓造船學會誌 Vol.11 No.1

        포항종합제철(浦項綜合製鐵)은 제품출하시(製品出荷時) 해송비(海送比)를 약(約) 80% 정도(程度)로 잡고 있으며, 현재(現在) 하루 평균(平均) 약(約) 3,000ton가량의 제품(製品)이 출하(出荷)되고 있다. 따라서 강재품(鋼材品) 수송(輸送)에 push-barge system을 적용(適用)했을 경우에 각(各) 주요예상소비지(主要豫想消費地)의 1일(日) 예상소비량(豫想消費量)을 장래의 시설확장(施設擴張)을 고려(考慮)하여 1,000ton/day에서 4,000ton/day까지 가정하였고 속도(速度)는 연안화물선(沿岸貨物船)의 예(例)를 따라 7knots에서 13knots까지에 걸쳐 조사(調査)하였다. 회항시(廻航時) 화물(貨物)은 일단 없는 것으로 가정하였으며 몇가지 생각될 수 있는 것은 schedule중(中)에서 "1 tugboats: 3 barges", "2 tugboats: 4 barges", "3 tugboats: 5 barges"의 3가지만을 대상(對象)으로 하였다. 조사(調査)한 결과(結果) 소비량(消費量) 1,000ton/day인 경우에 포항-울산(浦項-蔚山) : 1,000 DWT barge, 8 knots, 1 tugboat: 3 barges 포항-부산(浦項-釜山) : 1,550 DWT barge, 8 knots, 1 tugboat : 3 barges 포항-인천(浦項-仁川) : 2,690 DWT barge, 9 knots, 2 tugboats : 4 barges 등이 최적(最適)인 것으로 나타났다. 또 자항화물선(自航貨物船)과 비교(比較)하면 같은 크기의 자항화물선(自航貨物船) $2.5{\sim}3.0$척(隻)에 해당(該當)하는 효율(效率)을 가진다. 이 결과(結果)로 미루어 보건대 push-barge system은 앞으로 연구개발(硏究開發)의 충분(充分)한 가치(價値)가 있는 것으로 생각된다.

      • 가토에서 관절원판 후조직 절단 및 교합고경 감소가 악관절에 미치는 영향

        이병석,김종철 전남대학교 치과대학 1993 전남치대논문집 Vol.5 No.1

        In this study, effects of incision of retrodiscal tissue and unilateral occlusal reduction on temporomandibular joint of rabbit were investigated. Twenty-seven adult New Zealand White Rabbits, weighing over 3.5kg, were utilized in this study. Temporomandibular joint surgery was performed in left temporomandibular joint of 24 rabbits to displace disc anteriorly through incising the retrodiscal tissue 1-2㎜ posterior to the disc. They were divided into two groups : twelve were left untreated after surgery, occlusal reduction was performed on left posterior teeth every 2 weeks in the other twelve rabbits. The remaining three served as the control group. The sample were sacrificed by 8, 12, and 16 weeks after surgery. Histologic examinations were performed after sacrificing them. The results were as follows: 1. Histologic findings which was manifested by flat articular fossa, broad articular surface, generalized recession of articular cartilage and sclerosis of subchondral bone were observed. These findings were similar to internal derangement. 2. In the rabbits untreated after surgery, thin cartilagenous layer and necrotic tissue were observed in 8 weeks group, calcifying cartilagenous layer was observed in 12 weeks group, and cartilagenous layer on anterior portion was observed in 16 weeks group. So, it showed gradual healing pattern into the normal tissue except displaced disc. 3. Occlusal trauma after surgery resulted in generalized recession of upper and lower articular surface. Necrosis and vertical split on condylar process of mandible were observed in 8 weeks group. Osteoclasts, exposure of subchondral bone due to erosion on upper and lower articular surface, and degenerative changes on retrodiscal tissue were observed in 16 weeks group. So, it showed continuous progress pattern of osteoarthrosis.

      • KCI등재

        수직이착륙기 종축 제어기 설계에 적용된 입자군집 최적화 알고리즘과 KASS 시스템에 대한 고찰

        이병석,최종연,허문범,남기욱,이준화,Lee,,ByungSeok,Choi,,Jong,Yeoun,Heo,,Moon-Beom,Nam,,Gi-Wook,Lee,,Joon,Hwa 한국항공운항학회 2016 한국항공운항학회지 Vol.24 No.4

        In the case of hard problems to find solutions or complx combination problems, there are various optimization algorithms that are used to solve the problem. Among these optimization algorithms, the representative of the optimization algorithm created by imitating the behavior patterns of the organism is the PSO (Particle Swarm Optimization) algorithm. Since the PSO algorithm is easily implemented, and has superior performance, the PSO algorithm has been used in many fields, and has been applied. In particular, PSO-SAPARB (PSO with Swarm Arrangement, Parameter Adjustment and Reflective Boundary) algorithm is an advanced PSO algorithm created to complement the shortcomings of PSO algorithm. In this paper, this PSO-SAPARB algorithm was applied to the longitudinal controller design of a VTOL (Vertical Take-Off and Landing) aircraft that has the advantages of fixed-wing aircraft and rotorcraft among drones which has attracted attention in the field of UAVs. Also, through the introduction and performance of the Korean SBAS (Satellite Based Augmentation System) named KASS (Korea Augmentation Satellite System) which is being developed currently, this paper deals with the availability of algorithm such as the PSO-SAPARB.

      • KCI등재

        자동차손해배상보장법상의 ' 운행 ' 개념

        이병석 한국보험학회 2000 保險學會誌 Vol.55 No.-

        본고는 1999.7.1. 개정 시행된 현행 자배법 제2조2호의 운행 개념에 관한 연구이다. 해석 여하에 따라서는 폭넓게 확장해석될 수도 있는 이 규정의 개정 의의는 무엇이며, 그 범위는 어디까지 확장되는 것인지, 개념 확장이 이 법의 다른 규정에 어떠한 영향을 줄 수 있지는 않는지를 검토하는데 그 목적이 있다. 연구의 결과 현행 규정에 있어서 가령 ①운행 개념이 확장해석되는 경우에는 이 법 제1조의 전단만이 강조되는 결과를 낳게 되어 손해배상을 보장하는 제도로서의 역할이 퇴색될 수도 있고 또한 ②이 경우에 있어서는 인과관계에 관한 문제에 있어서도 일웅 브레이크 장치로 보이는 '운행으로 因하여'대하여 거는 기대도 오늘날 사고의 다양화와 피해자보호의 강화라는 추세속에서 얼마든지 희석될 수도 있고 또 '관리'의 해석 여하에 따라서는 상당인과관계를 일률적으로 적용할 수 없는 경우가 발생할 수 있다는 점을 알 수 있었다. 따라서 차라리 개정 시행된 이 법에 대하여 기존의 해석 틀을 벗어날 의도가 없고 또 설령 벗어난다 하더라도 현행 실무가 취급하는 범주를 벗어나지 않을 바에는, 새로운 자동차사고피해자보호를 위한 법이 나올 때까지는, 필자가 보기에는 별 문제가 없다고 보여지는 기존의 운행 개념인 '당해장치의 용법에 따른 자동차의 사용'에 대하여 인과관계를 느슨하게 적용할 수도 있는 '운행으로 말미암아'로 두는 것이 오히려 무리가 없지 않을까 하는 결론을 얻었다. This is a study on the operation concept of Article 2nd & its Paragraph 2nd of the existing Automobile Liability Insurance Law which was amended and came into effect as of Jul 01, 1999. Depending upon the interpretation, this law can be stretched in a sufferer favor unlimitedly. On account of that, what is the meaning why this regulations should be amended and how far can this scope be extended? How can this law influence on the other regulations or not? the propose of my study is to inquire into three questions mentioned above. As a result I studied on the existing regulations, (1), in case of the concept on operation being stretched in a sufferer favor unlimitedly, as only the fore part of Article 1st of this law may be emphasized eventually, an important role as a system for ensuring the compensation far damage may be discolored and (2), in case of the above, also in a case of the matters on the causation, one's expectation toward `arising out of the operation' which seems to be a brake device on one side may be diluted remarkably under the present tendency of today's accident diversity and strenthening the protection of victims. And depending upon interpretation on `maintenance', I can realize that a case, Which the reasonable causation can be not applied to equally, can happen. Accordingly, as for this law which was amended and came into effect, rather I have no intention in order to get out of the existing pattern of interpretation and even if also, I don't intend to get out of the scope which the practical businesses deal with. If it is so, until after a new law for protecting the victims due to the automobile accident come into existence, on my judgement, I can come to a conclusion that to put emphasis on 'arising out of the operation', which causal relationship on 'automobile's use in according to the usage of automobile's equipment' can be more loosely applied to, might not be unreasonable.

      • KCI등재
      • 韓牛의 育成期에 高粗飼料給與가 肥育期의 補償成長에 미치는 영향

        李柄錫 건국대학교 1988 論文集 Vol.26 No.1

        This studies were conducted to study the effect of the compensatory growth of Korean native cattle raised with high roughage diet in growing stage followed by high energy diet in late fattening stage. Ten Korean native cattle divided into two groups, five herd per treatment. Control groups fed high energy diet for all period(420 days) and treatment group fed high roughage diet in growing stage (385 days) and high energy diet in fattening stage (169 days). The results obtained were summarized as follows : 1. Dry matter requirements per kg of gain were 6.76 kg and 8.59 kg and TDN requirements per kg of gain were 5.23 kg and 5.29k kg in control and treatment groups, respectively and were statistically significant between treatment (p <0.05). Crude protein requirements per kg of gain were 1.08 kg and 1.06 kg in control and treatment groups and were not statistically significant. 2. In control group average daily gain was 0.99 kg for the experimental period of 420 days but in treatment group average daily gain was 0.39 kg of cattle fed high roughage diet in the growing stage of 385 days and was 1.41 kg of cattle fed high energy diet in the fattening stage of 169 days. 3. Dressing percentages were 42.2% and 42.8% and retail cuts percentages were 38.2% and 38.5% in control and treatment groups, respectively.

      • KCI등재

        불완전매체공유 환경을 위한 CSMA/CA기반 분산방식 매체접근제어기법

        이병석,전병욱,최진우,Lee,Byoung-Seok,Jeon,Byoung-Wook,Choe,Jin-Woo 한국통신학회 2006 韓國通信學會論文誌 Vol.31 No.5b

        We define the incomplete medium sharing system as a multi-channel shared medium communication system where any types of constraints are imposed to the set of channels that may be allocated to any transmitter-receiver node pair. A set of distributed MAC schemes are proposed, all of which are based on the CSMA/CA scheme employed in IEEE 802. 11 WLAN standards. Distributed MAC schemes are proposed in three different forms, which can be differentiated by the number and the location of back-off timers; that is, (1) one timer for all queues destined for different receiver nodes, (2) multiple timers at individual transmission queues, (3) multiple timers for individual channels. Through an extensive set of computer simulations, the performances of the proposed MAC schemes show that the MAC scheme with timers at individual transmission queues outperform the others in terms of throughput and delay for most cases considered. The complexity of the proposed schemes is also compared, and the first scheme obviously turned out to be the simplest, and the complexity of the second and third schemes depends on the number of receiver nodes and the number of channels, respectively. 매체공유기반 통신시스템은 매체접근제어 과정에서 단말기의 채널 점유 제약 조건에 따라 크게 완전매체공유 시스템과 불완전매체 공유 시스템으로 구분할 수 있다. 본 논문에서는 불완전매체공유 시스템의 채널활용효율을 향상시키기 위한 분산식 매체접근제어기법을 제안한다. 제안하는 매체접근제어기법은 IEEE 802.11 무선랜의 CSMA/CA 기법을 확장한 방법으로써 임의 지연 시간을(random backoff time) 채널에 대해 개별적, 집합적, 큐(queue)에 대해 개별적으로 적용함으로써 크게 3가지 형태로 제시되었다. 모의실험 결과 성능측면에서는 큐에 대해 개별적으로 임의 지연시간을 적용하였을 때 상대적으로 우월한 성능을 보였다. 또한 복잡도 측면에서는 채널에 대하여 집합적으로 임의 지연시간을 적용했을 때 상대적으로 낮은 복잡도를 보였다. 임의 지연시간을 분할된 채널에 대해 개별적으로 적용하는 방식은 성능과 연산복잡도의 trade-off관계에 있어서 앞서 제시된 방식들보다 우위에 있음을 보이고 있다.

      • KCI등재

        위성항법시스템을 이용한 연결식 차량의 잭나이핑 현상 예방을 위한 축소차수 상태관측기 설계

        이병석,허문범 제어·로봇·시스템학회 2012 제어·로봇·시스템학회 논문지 Vol.18 No.7

        This paper deals with ROLSO (Reduced Order Luenberger State Observer) design to prevent jackknifing phenomenon of articulated vehicles consisting of the tractor and semi-trailer by using GPS. In addition, by applying the regulator system using ROLSO feedback system, simulation's result presents that articulated vehicle's states are stabilized than the human's PR time (Preception Response time) rapidly. This simulation verifies that the automatic control of articulated vehicle's can be applied for the accident prevention for the time that the driver is unable to manage with the sudden accident. For this simulation, by using the equation of planar motion, the modeling of the articulated vehicle was performed. This modeling was expressed in the state space model. And FOLSO (Full Order Luenberger State Observer), ROLSO were designed by using the state space model of an articulated vehicle's dynamics.

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