• 수산해양교육연구
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• 제2권1호
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• pp.36-49
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• 1989

The authors investigated the present status of employment of graduates from ship-boarding departments, the Department of Fishing Technology, of Marine Engineering and of Communication Engineering. Graduater from the departments in Tong-Yeong Fisheries Junior College from 1977 to 1988 were taken as samples. The prospects of the graduates were studied on the bases of the present status of employment. The results obtained can be shown as follows ; 1. In Department of Fishing Technology, the number of graduates who are engaged in major field is 523 (56%) among total members of graduates 929, and number of fishing vessel officer is 382(73%) among above members of employment in major field. 2. In Department of Marine Engineering, the number of graduates who are engaged in major field is 553 (58%) among total members of graduates 953, and the number of merchant vessel officers is 357 (65%), among the above members of employment in major field. 3. In Department of Communication Engineering, the number of graduates who are engaged in major field is 340 (49%) among 698, total members of graduates, and the number of graduates who are engaged in electronics and communication field is 196 (58%) among the above members of employment in major field. 4. Developements of deep sea fisheries enable graduates to make easy to get jobs, but difficult to get. land jobs related to major field.

• Journal of Advanced Marine Engineering and Technology
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• 제38권4호
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• pp.409-417
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• 2014

최근 수년 동안 유가의 현저한 상승으로 인하여 상선의 디젤 기관은 저질 중유를 주로 사용하게 되었다. 따라서 저질 중유의 사용 증가에 따른 디젤 기관의 연소실 배기가스 온도는 점차 상승하여 가혹한 부식 환경에 직면하게 되었다. 그 결과 연소실 주변의 모든 기관 부품들의 부식과 마모는 다른 기관 부품들에 비해서 심각하다. 그러므로 이들 부품들의 적절한 덧살 용접은 수명 연장을 위하여 경제적인 측면에서 매우 중요하다. 본 연구에서는 피스톤 크라운 재질로 통상 사용되는 단강에 4종류의 용접재료로 SMAW와 GTAW로 용접하였다. 실험은 모재, 열영향부 및 용접금속의 부식 특성을 35% 황산용액에서 부식전위, 양극분극 곡선, 사이클릭볼타모그램 및 임피던스 등의 전기화학적인 방법으로 하여 고찰하였다. Inconel 625, 718 용접재료의 경우 용접금속의 내식성이 가장 우수하였고, 모재의 내식성이 가장 좋지 않았으며, 반면에 1.25Cr-0.5Mo와 0.5Mo는 모재가 용접금속에 비해서 더 좋은 내식성을 나타내었다. 또한, 용접금속 중 Inconel 625가 가장 내식성이 우수하였으며, 그 다음으로 Inconel 718 용접재료로 나타났다. 경도 역시 용접금속이 상대적으로 모재, 열영향부에 비해서 높은 값을 나타내었다. 특히 Inconel 718 용접재료의 경우 다른 용접재료에 비하여 가장 높은 경도값을 나타내었다.

• Corrosion Science and Technology
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• 제14권2호
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• pp.54-58
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• 2015

A heavy oil of low quality has been mainly used in the diesel engine of the merchant ship as the oil price has been significantly jumped for several years. Thus, a combustion chamber of the engine has been often exposed to severely corrosive environment more and more because temperature of the exhaust gas of the combustion chamber has been getting higher and higher with increasing of using the heavy oil of low quality. As a result, wear and corrosion of the engine parts such as exhaust valve, piston crown and cylinder head surrounded with combustion chamber are more serious compared to the other parts of the engine. Therefore, an optimum repair welding for these engine parts is very important to prolong their lifetime in a economical point of view. In this study, 1.25Cr-0.5Mo filler metal was welded with SMAW method in the forged steel which would be generally used with piston crown material. And the corrosion properties of weld metal, heat affected and base metal zones were investigated using electrochemical methods such as measurement of corrosion potential, anodic polarization curves, cyclic voltammogram and impedance etc. in 35% $H_2SO_4$ solution. The weld metal and base metal zones exhibited the highest and lowest values of hardness respectively. And, the corrosion resistance of the heat affected and weld metal zones was also increased than that of the base metal zone. Furthermore, it appeared that the corrosive products with red color and local corrosion like as a pitting corrosion were more frequently observed on the surface of the base metal zone compared to the heat affected and weld metal zones. Consequently, it is suggested that the mechanical and corrosion characteristics of the piston crown can be predominantly improved by repair welding method using the 1.25Cr-0.5Mo electrode.

• Clinical and Experimental Reproductive Medicine
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• 제2권1호
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• pp.19-38
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• 1975

A total of 185 vasovasostomies were carried out for 11 years. Various factors which are of importance in fluencing the successful vasovasostomies are analysed and presented as follows: In recent years, demand of reanastomosis of the vas deferens increased considerably. An average age of the subjects is 39, and that of their wives, 33 in this series. An average interval between vasectomy and vasovasostomy is 4 years. An average number of living chidren is 2.6 at the time of vasectomy. and 2.1 at the time of time of vasovasostomy. Merchant and public official are the most commonly encounterd occupation in the present series. Coital frequencies are 2.2/week after vasovasostomy. The most common reasons for requesting the vasovasostomy are remarriage and deaths of children, especially son. Success rate is considerably higher among younger group than that of the older. Success rate is somewhat higher among groups of shorter interval between the operations (vasectomy and vasovasostomy) than that of longer interval group. Success rate is higher among bilateral vasovasostomy group than that of any others. Success rate is higher in solid splint group and no splint group than hollow splint group. The closed dressing technique of the end of splint on the scrotum is found to be reasonably effective in preventing infection. Ordinary end-to-end anastomosis and folded side-to-side anastomosis techniques are proved to be the most ideal form of modified operation for the successful vasovasostomies. The most common causes of failure are infection, injuries of blood supply, avascular necrosis due to extensive mobilization, inadequate approximation of both vasal end, hematoma, changes of epididymal environment, and early ambulation in this series. Overall success rate of the author's series is found the 81 per cent, and impregnation rate is 35 per cent. Overall results reported by other workers are that success rate regarding appearance of sperm in the semen after operation is 64 per cent, and that of impregnation after vasovasostomy is 33 per cent. The results of semen assessment performed on same cases prior to vasectomy and following vasovasostomy showed that post-vasovasostomy sperm count scarcely reached three-quaters of pre-vasectomy count.

• 한국항해학회지
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• 제1권1호
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• pp.27-44
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• 1977

The Maneuvering Indices of a ship are the values that decide the quantity of her motion in turning when her rudder is turned over to an angle to the starboard or the port. They consist of two kinds of indices, one of which is called index K and the other, index T. Index K decides a ship's turning ability and index T does the length of time delay of a normal turning motion after her rudder has finished the turn of an ordered angle. Generally, the values of the indices are calculated through some mathematic formulas with figures of her heading degrees recorded at a fixed time intervals during her Z test. The values of the same kind index of a ship appear differently according to the ship'sspeed, trim, rudder angle and loaded condition, etc. In this paper, the author analyzed all the amthematic formulas required to calculate the values of the indices in their forming process and examined them from the point of mathematics and dynamics and also actually figured out the values of maneuvering indices of the M.S. "HANBADA", the training ship of Korea Merchant Marine College through her Z test. The author supposed a case in which two same typed ships as the "HANBADA" in size, shape and conditions were approaching each other in meeting end on situation and each ship turned her rudder hard over to the starboard respectively when they approached to the distance of 3 times as long as the ship's length. The author worked out mathematic formulas calculating forward and transverse ship's motions within the above mentioned situation for the quantative analysis of the collision avoding action to certify whether they are in collision status or not. Applying the calculated values of the maneuvering indices of the "HANBADA" to the motion calculating formulas, the author found out the two ships were passing over each other with the clearing distance o 39m between their port quarters. With the above mentioned examinations and explanations, the author demonstrated that a ship's motion in any collision avoiding action can be shown with quantities of time and distance within reliable limit.istance within reliable limit.

• 무역상무연구
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• 제21권
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• pp.129-151
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• 2003

Nowadays even if environment of international commercial transaction is changing quickly municipal law could not meet with such change accordingly. So far, however, efforts towards unification have prevailingly taken the form of binding instruments, such as non-national or supranational legislation, international conventions or international model laws. Among them, the UNIDROIT Principles with parties' autonomous and yet non-binding character do not only meet the substantive requirements of a true law merchant. In addition they also counter some of the main points of criticism against the modern lex mercatoria. As such the Principles constitute a cornerstone in the lex mercatoria debate and may become the heart of the new lex mercatoria. The purpose of this article is to ask whether there could be applied the Principles in international commerce. For the purpose it is to investigate when the Principles are applied in international commerce and how effectively the Principles are applied for the decision in international commercial disputes. Even though the Principles are used for reference by parties involved for the voluntary regulation of their contract, it is sufficiently expected that the Principles are to be a stepstone of uniform contract law in international commerce. Until now cases of appling the Principles are not satisfied with its expectation as a source of non-legislative means of unification or harmonization of law. Given the party's autonomy in the contract, this is among other things because business parties are strongly tend to observe their national laws in their international commerce. And also, even though there are a number of neutral and uniform regulations for international commercial contracts, parties do not often recognize their usefulness with being up to expectation. In order to explore the applicability of the Principles a number of cases of ICC International Court of Arbitration and others are quoted.

• 한국정밀공학회지
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• 제4권3호
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• pp.44-51
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• 1987

In metal cutting various types of chips are produced in consequence of cutting conditions. Flow-type chips have been studied in most cases because they are easier to be analyzed, but the actual surfaces of chips are not smooth, but crushed. This paper deals with saw-toothed chips, special types of flow-type chips, which have deep concaves and high convexes and sharp angles on the free surface. I tried to establish the theory of saw-toothed chip mechanism through experimental observation, that is, the mathmatical model of the cutting energy and cutting mechanism through the geometrical observation of the chips by using a microscope. The results obtained are as follows: 1. The mechanism of saw-toothed chips is diffenent from that of general flow-chips. 2. In the case of saw-toothed chips, the shear angle must be measured by the hypotenuse angle and the rake angle, and the shear angle is more affected by the rake angle than by the hypotenbuse angle. 3. The friction angle is represented by .beta. = . pi. /4+ .alpha./ sub n/- .phi. which is different from Merchant's equation. 4. The pitch and the slip are greatly influenced by depth of cut, but the influence of the rake angle on it is small. 5. The normal stress and the shear stress on the shear plane decrease with the increase of the cutting depth, and they are almost independent on the variation of a rake angle. 6. The unit friction energy on the tool face, the unit shear energy on the shear plane, and the total cutting energy per unit volume decrease with the increase of rake angle and cutting depth.

• 해양환경안전학회지
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• 제22권6호
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• pp.679-687
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• 2016

개발도상국에서 해양대학의 설립과 우수한 해기사의 양성은 해당 국가의 해양산업발전에 큰 영향을 줄 수 있다. 한국의 해양산업발전에 도전을 받은 케냐 정부에 의해 케냐해양대학의 설립을 위한 프로젝트가 추진되고 있다. 이 연구의 목적은 케냐해양대학을 위한 항해학과 교과과정을 개발하는 것이다. 이를 위해 먼저 케냐의 환경을 조사하였고, 이어서 IMO 해기교육요건, 모델코스 및 세계 주요 해양대학의 항해학과 교과과정을 검토하였으며, 이를 바탕으로 케냐해양대학 항해학과 교과과정을 개발하였다. 개발된 교과과정은 승선실습 1년을 포함하여 총 5년이 소요되는 과정이며, 총 200학점(매학기 20학점)을 이수하도록 되어 있다. 이 교과과정은 비록 케냐의 환경에 맞추어 개발된 것이지만, 국제적으로 표준화된 해기교육의 특성상 다른 국가의 유사한 연구에도 좋은 참고가 될 것으로 기대된다.

• Nutrition Research and Practice
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• 제9권2호
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• pp.207-212
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• 2015

BACKGROUND/OBJECTIVES: The Recaller app was developed to help individuals record their food intakes. This pilot study evaluated the usability of this new food picture application (app), which operates on a smartphone with an embedded camera and Internet capability. SUBJECTS/METHODS: Adults aged 19 to 28 years (23 males and 22 females) were assigned to use the Recaller app on six designated, nonconsecutive days in order to capture an image of each meal and snack before and after eating. The images were automatically time-stamped and uploaded by the app to the Recaller website. A trained nutritionist administered a 24-hour dietary recall interview 1 day after food images were taken. Participants' opinions of the Recaller app and its usability were determined by a follow-up survey. As an evaluation indicator of usability, the number of images taken was analyzed and multivariate Poisson regression used to model the factors determining the number of images sent. RESULTS: A total of 3,315 food images were uploaded throughout the study period. The median number of images taken per day was nine for males and 13 for females. The survey showed that the Recaller app was easy to use, and 50% of the participants would consider using the app daily. Predictors of a higher number of images were as follows: greater interval (hours) between the first and last food images sent, weekend, and female. CONCLUSIONS: The results of this pilot study provide valuable information for understanding the usability of the Recaller smartphone food picture app as well as other similarly designed apps. This study provides a model for assisting nutrition educators in their collection of food intake information by using tools available on smartphones. This innovative approach has the potential to improve recall of foods eaten and monitoring of dietary intake in nutritional studies.

• 해양환경안전학회지
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• 제22권5호
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• pp.430-443
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• 2016

본 연구에서는 해사대학의 학칙에 근거한 승선생활교육이 학생의 기본권을 제한하게 되는 경우, 그 제한이 헌법상 기본권 제한에 관한 일반원칙의 테두리 내에서 이루어지고 있는지 여부를 연구하고자 하였다. 해사대학은 헌법 제31조 제4항에 근거하여 자율적으로 학칙을 제정하여 학생을 규율하고 있다. 하지만, 학생의 기본권을 제한하기 위해서는 기본권 제한 3단계인 (1)법적 근거가 있어야 하며, (2)비례성원칙을 통과하고, (3)헌법 제37조 제2항에 따른 본질내용을 침해하지 않아야 한다. 이 논문에서 검토결과 첫째, 법적근거는 고등교육법과 국립학교설치령 및 학칙에 근거하고 있다. 둘째, 헌법의 비례성원칙을 위반한 것으로는 보이지 않으며, 셋째, 기본권제한의 한계인 본질내용의 침해가 없는 것을 확인하였다. 즉 해사대학생에 대한 승선생활교육이 헌법상 보장하고 있는 기본권 침해는 없는 것으로 확인되었다. 다만, 승선생활교육을 시행하는 과정에서 비례성원칙의 한계를 넘지 않도록 감독을 강화하고, 개별학생의 일탈이 발생하지 않도록 지도 감독을 철저히 해야 한다.