• 생명과학회지
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• 제8권3호
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• pp.285-293
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• 1998

이미 밝혀져 있는 mariner 전이인자의 전이효소를 암호화하는 부위에 대하여 퇴화성 primer를 사용하여 PCR 방법에 의해 누에(Bombyx mori)에서 ariner 유사 전이닌자의 잠정적인 전이효소 부위를 클로닝 하였다. BmoMAR로 망명된 이 PCR 클론으로부터 추론된 아미노산은 152개로 다섯 개의 종결코돈이 삽입되어 있었으며, Drosophila mauritiana의 active Mos 1에 37%의 아미노산 상동성을 보였다. 또한, 기존의 곤충들에서 밝혀진 mariner-like element에 대한 상동성은 DNA 수주에서는 Apis mellifera에 59% 그리고 아미노산 수준에서는 D. mauritiana 7.9 clone에 37% 상동성을 보였다. 이 결과는 mariner-like element가 B. mori에도 존재하고 있지만. 이들 전이인자의 전이효소를 암호화하는 부위에 종결코돈이 발견되는 것으로 보아서 비활성 전이인자 혹은 일존의 selenoprotein으로 추정된다.

• 한국항해항만학회지
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• 제32권2호
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• pp.127-132
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• 2008

The safety degree of navigation for collision avoidance is closely related with the combination between mariner's behavior and navigational environment. The condition of navigational environment is mainly decided by navigable waters, ship traffic, rule of road, sea state, weather and so on. Especially, the condition of navigable waters and ship traffic in navigational environment are ones of the important factors to attain safe navigation when mariners are underway and crossing, head on or overtaking situation. Thus this paper is to analyze the characteristics of mariner's behavior for collision avoidance caused by ship traffic and navigable waters by analyzing the contents of questionnaire and the results of international collaborative research. As a result, it can be concluded that the density of ship traffic and the area of navigable waters affect mariner's ship handling for collision avoidance.

• 한국항해항만학회지
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• 제35권2호
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• pp.149-157
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• 2011

The objective of this study was to compare the attitude of merchant marine student of Thailand in 3 aspects; cognitive, affective and behavioral classified by institutes, domiciles, parent's occupation, parent's income per month, motivation and information receiving concerning mariner profession. The sample used in this study consisted of 867students in maritime institutes of Thailand. The instrument implemented in collecting data was a set of 30 five rating scale questionnaires. The statistical methods applied in analyzing the data were mean, standard deviation, t-test and one way analysis of variance and fisher's LSD. The results of this research shows that the attitude in vocational education of Thai merchant marine student was of the high in every aspect. Attitude for mariner profession of Thai merchant marine student in terms of different institutes had different in all aspects. In terms of different domiciles, it shows different attitude in affection and similar attitude in cognition and behavior. In terms of parent's occupation, it shows similar in all aspects. In terms of parent's income per month, it shows different attitude in cognition and affection and similar attitude in behavior. In terms of motivation, it shows similar in all aspects. In terms of information receiving concerning mariner profession, it shows different attitude in all aspects.

• 생명과학회지
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• 제8권4호
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• pp.457-464
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• 1998

누에, 멧누에, 천잠 및 작잠에서의 형질전환용 vector 개발을 위한 첫단계로 이미 인간을 포함한 여러 곤충에서 그 존재가 확인된 mariner transposable element가 이들 견사 곤충에 존재하는지의 여부를 탐색하기 위해서 이미 보고된Drosophila mauritiana와 Hyalophora ceropia의 mariner transposase 유전자의 고도로 보존성이 높은 부위에 대한 degenerctive primer pair를 제작하여 이들의 존재 여부를 탐색하였다. 결과적으로 예상되는 약 500bp의 PCR product가 관찰됨에 따라서 모든 견사곤충의 genome에는 maminer-like element(MLE)가 존재한다는 것을 간접적으로 확인할 수 있었다. 이미 cloning된 pBmoMAR를 probe DNA로하여 southern hybridization을 수행한 결과에서도 확인 할 수 있었으며, 각 견사층의 genome내에 high copy로 존재한다는 것을 추정할 수 있었다. 따라서 이와 같은 결과는 견사곤충에서 MLE가 vector system으로써 개발될 수 있는 기초자료로 제공될 수 있을 것이다.

• 한국항해항만학회지
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• 제30권6호
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• pp.427-432
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• 2006

본 연구는 선박 조종에 영향을 주는 대표적 요인들(충돌위험 정도, 목표선박의 항로변경 여부 및 주변 선박 수)을 체계적으로 조작한 조건들에서 항해사의 상황인식 훈련이 항해사의 선박 조종 능력에 어떠한 차이를 가져오는지 선박조종시뮬레이터를 이용하여 분석하였다. 본 연구 결과를 요약하면 다음과 같다. 첫째, 항해와 관련된 상황인식 훈련을 받은 조건에서 실험참가자들은 여러 선박 조종 요소들(목표선박과의 거리 유지와 충돌 비율)에서 훈련을 받지 않은 조건에 비해 수행이 우수하였다. 둘째, 훈련을 받지 않은 실험참가자들은 목표선박이 평시상황에서 항로를 변경하는 경우 선박 조종에 가장 큰 어려움을 겪었으나 훈련 이후에는 이러한 경향이 크게 감소하여 동일한 조건에서 수행이 향상되는 것이 관찰되었다. 이러한 결과들을 종합하면, 선박 조종에서의 상황인식에 대한 여러 요소들의 훈련은 항해사들의 기본적 선박 조종능력에서 우수한 수행을 이끌 수 있는 것으로 판단된다.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2004년도 Asia Navigation Conference
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• pp.129-138
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• 2004

Recently, maintenance of clean ocean is very important issue. One part of the issue strongly relates to the safe navigation of vessels. Most parts of safe navigation depend on the mariner's competencies. STCW was established to guarantee the sufficient mariner's competencies. However the code dose not indicate the each necessary competency clearly. Therefore, the understandings on STCW are not same among training institutes, and each training institute interprets them individually and executes them. As a result, it makes big differences among the institutes concerning training methods and contents and the assessment on mariner's competencies. The countries in EU have paid attention on this issue and the activities enhance the rational assessment of competencies through METNET. In order to execute the rational assessments, it is necessary to clarify the techniques being assessed. And it means the necessity to clarify the necessary techniques for safe navigation and to assess the competencies to achieve them, and then we can attain the objectives of STCW. In this paper, the necessary techniques for achievement of safe navigation are discussed and the methods of assessment of competencies are proposed. As we apply proposed assessment system, we can get the mariner's competency quantitatively and continuously through training period. Then we can know the trend of the competency that is the learning process. By clarifying the learning process of the techniques, we can decide the necessary training time to achieve the competencies. Furthermore, we can discuss the issues on conversion between training onboard and simulator used training by analysing the learning processes.

• 해양환경안전학회:학술대회논문집
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• 해양환경안전학회 2017년도 공동학술발표회
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• pp.59-59
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• 2017

• 한국안전학회지
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• 제23권1호
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• pp.46-50
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• 2008

The purpose of the present study was to investigate the mariner's information characteristics in ship-ta-ship collision situation using the full mission ship-handling simulator. Risk levels of ship-to-ship collision were manipulated by whether the target ship complies with the naval regulations and by movement patterns of target ship. Dependent variables reflecting mariner's information characteristics in ship-ta-ship collision situation were measured in terms of radar detection reaction time, free recall performance of past navigation situation, and subjective ratings for the task difficulty. The results showed that, in general, the mariners appeared to be deteriorated in their radar detection reaction time and free recall performance as the risk of ship-ta-ship collision increased. Also, the mariners tended to rate required tasks more difficult in the high risk ship-ta-ship collision situation.

• 수산해양기술연구
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• 제59권2호
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• pp.145-154
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• 2023

In this study, to control the heading angle of a ship, which is constantly subjected to various internal and external disturbances during the voyage, an LADRC (linear active disturbance rejection control) design that focuses more on improving the disturbance removal performance was proposed. The speed rate of change of the ship's heading angle due to the turn of the rudder angle was selected as a significant factor, and the nonlinear model of the ship's maneuvering equation, including the steering gear, was treated as a total disturbance. It is the similar process with an LADRC design for the first-order transfer function model. At this time, the gains of the controller included in LADRC and the gains of the extended state observer were tuned to RCGAs (real-coded genetic algorithms) to minimize the integral time-weighted absolute error as an evaluation function. The simulation was performed by applying the proposed GA-LADRC controller to the heading angle control of the Mariner class vessel. In particular, it was confirmed that the proposed controller satisfactorily maintains and follows the set course even when the disturbances such as nonlinearity, modelling error, uncertainty and noise of the measurement sensor are considered.

• 한국항해항만학회지
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• 제27권4호
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• pp.413-424
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• 2003

이 논문에서 필자들은 유럽과 중국에서 거의 비슷한 시기에 나침반이 항해에 이용되었음을 역사적 기록과 최근까지의 연구성과들을 검토함으로써 밝히고자 하였다. 그 연구 결과는 다음과 같다. 첫째, 동서양 문명권에서 항해자들이 나침반을 항해에 이용하기까지 비슷한 과정을 거쳤다. 즉 표침, 축침, 콤파스 카드 순으로 항해용 나침반을 개발하여 사용하였다. 둘째, Frode의 사가(saga)를 고려해 볼 때 중국과 유럽에서는 11세기 경에 나침반을 항해에 이용하였다. 결론적으로 중국인들이 세계 최초로 나침반을 항해에 이용했다는 기존 주장과는 달리, 중국인들과 유럽인들은 거의 비슷한 시기에 서로 독자적으로 나침반을 항해에 이용하였다.