PC를 이용한 선박의 위치정보전송 SYSTEM에 관한 연구

홍창희,배정철,예병덕,오종환,조호성,황상구,Hong, Tchang-Hee,Bae, Jeong-Cheol,Yea, Byeong-Deok,Oh, Jong-Whan,Cho, Ho-Sung,Hwang, Sang-Gu 한국항해항만학회 1991 한국항해학회지 Vol.15 No.4

Since it is very important for an ocean-going vessel to transmit information quickly and accurately to her owner or charterer not only for the ship's safety but for economic operation of the ship, some newly-built automated vessels equipped with automatic information transmission system which consists of INMARSAT-C and specially-designed computer. This system, however, is not applicable to the existing vessel without chaging her equipments and, furthermore, is too expensive for small shipping companies to fit out such a system on their vessels. Therefore, we propose a low-priced information transmission system which consists of a personal computer and communication equipments in the existing vessel, and in this paper, as the groundwork of the proposed system, we have made up the ship's position transmission system which is composed of and IBM AT-compatible, PC, INMARSAT-A and a GPS receiver. As the test result of the system through sea trial on the training ship 'HANBADA', we confirmed that transmission of the ship's position was achieved succesfully and consequently there could be high possibility of cost-effectiveness of the proposed system.

근접상황 선박충돌회피지원모델에 관한 연구(Ⅰ)

양형선(Hyoung-Seon Yang),예병덕(Byeong-Deok Yea) 한국항해항만학회 2004 한국항해항만학회지 Vol.28 No.10

선박운항시스템은 첨단화 되고 있으며, 선박충돌회피시스템에 관한 연구가 활발히 진행되고 있다. 그럼에도 선박 충돌사고율은 줄어들지 않는 실정이다. 시스템에 의한 충돌회피 조종에도 불구하고 근접거리로 충돌위험이 계속 존재한다면, 충돌위험 결정 및 판단기준에 있어서 단순히 TCPA, DCPA만의 입력변수 사용은 근접상황에서 충돌위험회피에 도움을 주지 못한다. 최근 5년간 국내 선박충돌사고 상대선 초인거리 조사에 의하면 약 45%가 2마일 이하 근거리 초인하는 것으로 분석된다. 이런 요소는 선박조종성능 특성과 행위결정을 위한 시간적 특성의 영향을 많이 받는 근접조우를 유발한다. 따라서 근접상황에서 선박충돌회피동작 결정에 관한 연구는 안전항해의 필수적인 요소라고 할 수 있을 것이다. 본 논문에서는 선박조종성능 특성에 따른 선회조종과 선박의 거동을 분석하여 근접상황에서 신속하고 올바른 충돌회피 조선을 지원할 수 있는 선박충돌회피지원 모델을 제시한다. Up to now a lot of the study on ship collision avoidance systems have proceeded actively. However the rate of ship collision accidents hasn’t decreased yet. If there is collision risk in close quarters situation in spite of maneuvering ship for collision avoidance according to the system, only use of TCPA and DCPA as input factor for collision risk decision is not useful to avoiding collision action. For the recent 5 years by the analysis of first observation distance about approaching ship in domestic collision accidents, nearly 45% of accidents is close first observation less than 2 miles. Therefore it is essential part for safety navigations to study for collision avoidance action in close encounter. In this paper, as a fundamental study of supporting collision avoidance maneuvering for navigators, we proposed ship collision avoidance support model in close quarters situation through analysis of collision accidents to effectively get rid of the causes.

근접상황 선박충돌회피지원모델에 관한 연구(Ⅱ)

양형선(Hyoung-Seon Yang),예병덕(Byeong-Deok Yea) 한국항해항만학회 2005 한국항해항만학회지 Vol.29 No.10

본 연구는 근접상황 선박충돌회피지원시스템 개발을 위한 기초연구로써, 근거리 조우상황에서 항해사의 부적절한 조선으로 발생하는 선박충돌사고를 감소시키기 위한 선박충돌회피지원모델을 제시한다. 이 모델은 선박의 다양한 조우상황을 비교하고, 자선의 선회특성을 이용하여 상대선박의 침로, 속도 유지에 대한 충돌회피 가능영역과 방법을 나타냄으로써 근접상황에서도 신속한 피항동작 검토 및 결정을 가능케 하며 효과적인 충돌회피 조선을 지원할 것이다. In this paper, as a fundamental study of ship collision avoidance supporting system in close quarters situation, we propose ship collision avoidance support model for decreasing ship collision accidents those have occurred due to navigator’s unsuitable maneuvering in close encounter. This model will effectively support maneuvering for collision avoidance through displaying the feasible area and the method of collision avoidance using own ship’s turning characteristic about action of target ship’s keeping course and velocity.

도허티 이론을 이용한 전력증폭기의 효율 향상에 관한 연구

전중성(Joong Sung Jeon),예병덕(Byeong Deok Yea) 한국해양대학교 해사산업연구소 2004 海事産業硏究所論文集 Vol.15 No.-

In this paper, Doherty amplifier is designed by the need of improving the linearity and efficiency of wireless network and repeater for WCDMA. It is designed to maintain the high linearity and efficiency at the low efficiency period of the power amplifier after analyzing Doherty technique using the active load-pull in condition of the high efficiency power amplifier implementation according to the variation of input power. CW 1-tone experimental results at the WCDMA frequency 2.11~2.17 ㎓ shows that Doherty amplifier, which achieves power add efficiency(PAE) 50 % at 6 ㏈ back off the point from maximum output power 52.3 ㏈m, obtains higher efficiency of 13.3 % than class AB. Finding optimum bias point after adjusted gate voltage, Doherty amplifier shows that IMD₃ improves 4 ㏈.

A Study on Mariners' Standard Behavior for Collision Avoidance 1 : A concept on modeling for collision avoidance based on human factors

박정선(Jung-Sun Park),Hiroaki Kobayashi,예병덕(Byeong-Deok Yea) 한국항해항만학회 2007 한국항해항만학회 학술대회논문집 Vol.1 No.춘계

Human factors have been considered as main reason of marine accidents. Especially, the collision between vessels is mostly caused by human behavior. However, there had not been many researches to clarify the reason of marine accidents caused by human factors quantitatively. In order to understand human factors and to enhance safe navigation systematically, we've investigated the characteristics of avoiding behavior taken by mariners by using ship-handling simulator. Further in order to apply the characteristics more widely and effectively, it's necessary to formulate the standard behavior for ship-handling in the condition of collision avoidance. Is this study, therefore, we intended to propose the concept to model the mariner's standard behavior on the handling of collision avoidance as the first step. As a result, we confirmed the contents of information processing in ship-handling that mariner's generally taking to avoid collision.

A Study on Mariners' Standard Behavior for Collision Avoidance 2 : A proposal of modeling method for collision avoidance based on human factors

박정선(Jung-Sun Park),Hiroaki Kobayashi,예병덕(Byeong-Deok Yea) 한국항해항만학회 2007 한국항해항만학회 학술대회논문집 Vol.1 No.춘계

We've investigated mariner's characteristics in the condition of avoiding collision using ship handling simulator and considered that it's necessary to model the standard avoiding behavior of mariners in ship handling in order to apply the obtained results more widely and effectively. Thus we proposed the concept to model mariner's avoiding behavior based on human factors in a previous study. As a following study, in this paper, we intended to propose the method of modeling on standard behavior for avoiding collision by analyzing mariner's information processing works and related factors using regression analysis. As a result, we confirmed the influence of relating factors to avoiding behavior in mariner's deciding decisions and proposed the modeling method on mariners' standard behavior for collision avoidance.

The Relation between Human Behavior and Safety in the Collision Avoidance Situation

박정선(Jung Sun Park),Hiroaki Kobayashi, 예병덕(Byeong-Deok Yea) 한국항해항만학회 2003 한국항해항만학회 학술대회논문집 Vol.3 No.-

It can be said that the relationship between the maneuvering ability of operators and the navigational environment affects the safe degree of navigation in the collision avoidance situation. In order to reduce the occurrence probability of accident and to maintain the safety, it is necessary to clarify the relationship between human behavior and navigational environment. In this study, therefore, we analyzed and discussed the relationship between the maneuvering characteristics and the safety centered on human behavior as a fundamental factor of maritime accident using ship handling simulator and questionnaire. As a result, we concluded that navigational environment changes variously and the maneuvering ability of operators also varies with the navigational environment, and the ship handling characteristics strongly affect the occurrence probability of accident.

해상교량이 항만운영에 미치는 영향에 대한 연구

박정선(Jung-Sun Park),강정구(Jeong-Gu Kang),박진수(Jin-Soo Park),예병덕(Byeong-Deok Yea) 한국항해항만학회 2007 한국항해항만학회 학술대회논문집 Vol.2 No.추계

최근 해상교량의 건설이 증가하면서 해상교량의 건설로 인한 여러 가지 문제점들이 보도되고 있다. 인천 제2연륙교의 건설지연을 비롯한 여러 가지 문제점은 이러한 분쟁의 대표적인 예라고 할 수 있다. 특히 해상교량 건설 이전에 이미 그 해역을 항행하고 있던 선박과 그 선박을 이용해 이루어지던 물류의 흐름을 저해하는 해상교량의 건설은 장기간의 국가경제라는 측면에서 보면 커다란 손실을 입히게 될 것이라는 것을 누구라도 예측할 수 있다. 이 연구에서는 해상교량이 건설될 경우 선박교통의 흐름과 항만 운영에 미치게 되는 영향에 대하여 조사함과 동시에 실제 선박을 조선하여 해상교량 하부의 항로를 통과하여야 하는 도선사들의 의견을 수렴하여 문제점을 분석하고, 그 결과를 정리하여 향후 해상교량 건설의 표준안을 세우는데 기초 자료로 활용하고자 한다.

액상결정성장에 의한 InGaAsP / InP MQW - LD 제작에 관한 연구

조호성(Ho-Sung Cho),홍창희(Tchang-Hee Hong),오종환(Jong-Hwan Oh),예병덕(Byeong-Deok Yea),이중기(Jung-Gee Lee) 한국광학회 1992 한국광학회지 Vol.3 No.4

본 연구에서는 수직형 LPE장치를 이용하여 InGaAsP/InP MQW-DG웨이퍼를 성장하고 10 ㎛ stripe MQW-LD를 제작하였다. 공진기 길이 470 ㎛ LD의 경우 이득스펙트럼 중심파장은 1.32㎛였다. 발진 파장은 1.302 ㎛로써 양자우물두께 300 Å의 이득중심에 해당한다는 사실을 알 수 있었다. In this study, InGaAsP/InP MQW-DH wafer was grown by a vertical type LPE system and 10 ㎛ stripe MQW-LD was fabricated with the wafer. The threshold current was about 200 ㎃ and when the cavity length of the LD was 470 ㎛ the central wavelength of gain spectra was 1.32 ㎛ the lasing wavelength was 1.302 ㎛ which corresponded to the gain center of the quantum well thickness of 300 Å.

전원선에서의 광대역 EMC 필터의 설계 및 제작

김동일,구동욱,양은정,김도연,예병덕 한국해양대학교 산업기술연구소 2003 연구논문집 Vol.20 No.-

제안된 EMC 필터는 높은 투자율의 페라이트 비드와 관통형 콘덴서로 구성하여 제작하였고, 10 MHz ∼ 1.5 GHz에서 전원선에서 광대역 노이즈 신호에 대한 EMC 요구를 만족시킨다. 최적의 필터를 설계하기 위하여 페라이트 비드의 임피던스를 계산하여 찾았다. 그 결과, 광대역 EMC 필터는 차동모드 노이즈와 공통모드 노이즈에 대해 10 MHz ∼ 1.5 GHz대역에서 30 dB 이상의 필터 특성을 나타내었다. 그리고, DC ∼ 1.8 GHz 주파수 대역에서 10 ∼ 30 dB이상의 내성 특성을 향상시켰다. The proposed EMC filter composed with feed-through capacitors and ferrite beads of high permeability was prepared which satisfy the EMC standard for a wide-band noise signal in the frequence of 10 MHz to 1.5 GHz in power supply line. The optimum structure of ferrite bead was found by calculating the load effect of ferrite beads. As a result, the filter showed excellent differential- and common-mode noises filtering characteristics above 30 dB in the frequency band from 10 MHz to 1.5 GHz. The immunity characteristics are improved more than 10 to 30 dB over the frequency band from DC to 1.8 GHz.