• 한국해안해양공학회지
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• 제5권1호
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• pp.11-18
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• 1993

해난사고 발생시 수색구조 작업의 성공여부는 정화한 표류지점의 추정에 있다. 본 논문에서는 현재 외국에서 사용중인 표류지점 추정에 관한 여러가지 기법을 소개하였고, 이들의 장단점을 비교하여 국내상황에 적합한 전산모델을 제시하였다. 제시된 모델은 해상 환경자료의 입력을 고려하여 두 가지 방식으로 나누어진다. 하나는 해양정보시스템으로부터 정확한 환경자료를 제공받을 수 있는 경우에 대비하여 FLENUMWEACEN 방식을 따른 것이고, 다른 하나는 불확실한 해수유동 자료와 현재 기상청의 해상풍 예보를 입력자료로 사용해야 할 경우를 고려하여 U.S. Coast Guard의 CASP 방식을 수정한 것이다. 모델에서 조난대상물은 사람, 구명정, 선박으로 분류하였으며, 구명정은 ballast와 canopy의 유무에 따라 세분하였고, 선박은 배수용적을 대, 중, 소로 나누어 구분하였다. 형태별 분류과정에서 과거의 모든 실험결과들을 재정리하여 새로운 leeway 값을 결정하였으며 제시된 모델들은 몇 개의 실제 현장실험 결과와 비교되었다.

• 대한토목학회논문집
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• 제33권1호
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• pp.377-386
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• 2013

공동주택이 고층화됨에 따라, 고층 공동주택 거주자들은 이익을 누리는 반면에 건축물 배후를 이용하는 사람들은 주거 환경에서 많은 문제를 경험하게 되었다. 본 연구에서는 공동주택 중에서도 특히 공동주택의 높이가 도시경관에 미치는 영향에 대해 알아보기 위하여 사례 연구 및 비교 분석을 수행하였다. 그 결과, 해안지역의 공동주택 단지나 건축물들에 한해서는 그에 적합한 높이관리의 규제를 마련하여 여러 가지로 난립되어 있는 높이에 관한 제도들을 총괄적으로 관리 할 수 있는, 불안요소들을 모두 아우를 수 있는 방안이 모색되어야 할 것으로 판단된다.

• 한국해안·해양공학회논문집
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• 제23권1호
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• pp.70-78
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• 2011

2009년 8월 13일과 15일, 부산 해운대 해수욕장 앞 해상에서 이안류가 발생하였다. 또한, 올 여름인 2010년 7월 29일과 30일에도 이안류가 발생하여 피서객 들이 조난된 사고가 발생하였다. 해수욕객들은 전원 구조되어 인명 피해는 발생하지 않았지만 최근 이안류 발생이 너무 잦아져 이에 대한 원인파악과 대책마련이 시급한 실정이다. 본 논문에서는 파랑모형과 조류가 결합된 해빈류 모형을 기본으로 튜브거동까지 재현되는 사용자 편의를 위하여 GUI로 개발된 HAECUM 모형(HAEundae CUrrent Model)을 이용, 해운대 해수욕장의 이안류 발생 수치모의를 실시하였다.

• Ocean and Polar Research
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• 제31권4호
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• pp.339-347
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• 2009

It is possible to obtain accurate temperature and salinity profiles of the oceans using a SBE 911plus CTD and accompanying data conversion packages. To obtain highly accurate results, CTD data needs to be carefully processed in addition to proper and regular maintenance of the CTD itself. Since the manufacturer of the CTD provides tools that are necessary for post processing, it is possible to conduct proper processing without too much effort. Some users, however, are not familiar with all of the processes and inadvertently ignore some of these processes at the expense of data quality. To draw attention to these and other similar issues, we show how it is possible to improve data quality by utilizing a few extra processes to the standard or default data process procedures with CTD data obtained from the equatorial Eastern Pacific between 2001 and 2005, and 2007. One easy step that is often ignored in the standard data process procedure is "wild edit", which removes abnormal values from the raw data. If those abnormal values are not removed, the abnormality could spread vertically during subsequent processes and produce abnormal salinity in a range much wider than that of the raw data. To remove spikes in salinity profiles the "align CTD" procedure must be carried out not with the default values included in the data processing software but with a proper time constant. Only when "cell thermal mass" correction is conducted with optimal parameters, we can reduce the difference between upcast and downcast, and obtain results that can satisfy the nominal accuracy of the CTD.

• 한국해안·해양공학회논문집
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• 제24권6호
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• pp.373-380
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• 2012

우리나라의 동해안에 위치한 백사장은 경치가 수려하고, 레져를 즐기기에 좋은 양질의 모래로 이루어져 있으며 백사청송으로 알려져 있기 때문에 매우 중요한 관광경제자원이라 할 수 있다. 뿐만 아니라, 해안의 자연환경 유지기능 및 높은 파도로부터 해안주변을 보호해주는 방재기능까지도 보유하고 있는 귀중한 재산이다. 이와 같은 해안 백사장의 가치평가방법으로는 여행자비용법(Travel Cost Method)과 조건부가치평가법(Contingent Valuation Method)이 대표적으로 사용되고 있으나, 이용가치와 비이용가치를 동시에 평가하기위해서는 후자의 방법이 보다 유리하다고 할 수 있다. 그러나 조건부가치평가법(CVM)을 대상 해안의 백사장에 적용하기 위해서는 앙케이트 설문 및 회답에서 나타날 수 있는 바이어스(Bias)영향에 대한 면밀한 검증이 요구된다. 본 연구에서는 조건부가치평가법(Contingent Valuation Method)등을 통해 앙케이트설문 조사시 바이어스 영향을 줄여주기 위해 설문자에게 제시할 수 있는 일차적인 친수환경(Amenity)특성 검토방법을 소개하고, 동해안에 위치한 대표적인 백사장들을 대상으로 하여 다양한 평가인자를 이용하여 친수환경(Amenity)특성을 비교, 검토하였다.

• 수산해양기술연구
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• 제57권2호
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• pp.162-172
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• 2021

This study was conducted to determine whether the layout of wheelhouse and work environment of coastal improved stow net fishing boats affect the physical abnormalities of wheelhouse workers through a survey and to use it as basic data to improve the wheelhouse work environment. The analysis results are as follows. The result of factor analysis on the wheelhouse work environment was classified into three factors: suitability of work environment, suitability of work space arrangement, and layout of navigational and fishing equipment. The result of factor analysis on physical abnormalities was divided into two factors: physical pain and fatigue. The results of regression model analysis showing factors affecting physical pain showed that the t-value in the regression model was 3.625 (p < 0.05), indicating that the work environment suitability had an effect on the physical pain. Work environment suitability had a significantly positive effect on the physical pain. As work environment suitability increased by 1, the physical pain increased by 0.371 (p < 0.05). The results of regression model analysis showing the influencing factors on fatigue were found to have a t-value of 3.009 (p < 0.05) in the regression model, indicating that the work environment suitability had a significantly positive effect on the feeling of fatigue. It was found that fatigue increased by 0.324 (p < 0.05) as the work environment suitability increased by 1. In addition, the manageability of task suitability was found to be t = -2.521 (p > 0.05). As the manageability of task suitability increased, the skipper's fatigue level decreased. From these results, it is inferred that the wheelhouse of the current coastal improved stow net fishing boats causes physical pain and fatigue for the skippers. In order to reduce such physical pain and fatigue, and to improve safe fishing operation and job satisfaction, it is necessary to provide a wheelhouse to fishermen on coastal improved stow net fishing boats in consideration of the characteristics of the wheelhouse work of fishing boats and in consideration of users.

• 한국농공학회:학술대회논문집
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• 한국농공학회 1998년도 학술발표회 발표논문집
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• pp.344-348
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• 1998

FEM numerical models have been known to provide an extensive applicability to the field of water resources development. However, some of restrictions such as requiring considerable number of input data and numerous subprocess were the problem of using such FEM numerical models. Especially, where the model is applied to the complex coastal area, difficulties will be intensified. Therefore it is necessary that the profitable user interface, data optimization, and structured system should be developed if the models could be used effectively. In this study, it is intended that development of integrated system for simulations of FEM numerical models to give better applicability in the field of water resources development. By using integrated system which was developed in this study, it would be concluded that the efforts to need some treatments for subprocesses of the FEM numerical model were decreased and GUI environment proved to be convinient for use for the on-the-job users.

• 한국항해항만학회지
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• 제28권9호
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• pp.821-825
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• 2004

The purpose of this study is the assessment of changes in the leisure patterns of users of the Eulsook-do before and after the estuary dike construction. The following survey research method was conducted to implement the study, sampling by age was carried out selectively and randomly alike. A total of 319 persons were chosen for final analysis, excluding questionnaires answered found to be inappropriate. To measure the image of the lower Nakdong River around the Eulsook-do, with advice sought from experts, researchers, through several pilot tests, developed a 24-item semantic differential scale(SDS) that has two bi-polar adjectives at each end Study of the pre- and post- construction images of the Eulsook-do located on the coast of Busan suggests the dike construction has brought about negative changes in the Eulsook-do's overall image. There can be two alternatives for improving the negative image: restoration and development.

• Asia pacific journal of information systems
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• 제26권1호
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• pp.124-142
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• 2016

Companies operating in social network platforms continue to improve and expand their marketing techniques. This study examines the practice of "gating", which involves virtual barriers between social network users and company content. Gates demand mandatory user endorsements, in the form of a Facebook "Likes", Twitter "retweets" etc., to gain access to company content, such as coupons and rewards,. Gating practices demand a mandatory endorsement before any content consumption takes place. Thus, while user endorsements are assumed to arise voluntarily from trusted known sources, gating practices would appear to violate this assumption. However, whether this violation lessens the effectiveness of gating practices still requires empirical validation. We investigate this question through the use of a unique panel data set that includes data on "like" endorsements obtained from a number of real-world Facebook business pages. Results of the study show that gating practices are effective for endorsement solicitation; however, gates may interfere with more traditional marketing activities.

• 해양환경안전학회지
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• 제19권3호
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• pp.248-256
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• 2013

Part 2 of the Questionnaire Survey on Marine Safety and VTS in the Philippine Coastal Waters presents the alternatives to risk reduction, modifying the VTS, the qualification and competency of a VTS operator and effectiveness of the services and assistance rendered by VTS. This study finds that majority of respondents chose "Improved education and training of mariners" as the best alternative to risk reduction and the "Strict enforcement of ship safety regulations" as the best alternative based on the respondents' ranks last served onboard and areas of familiarity. In modifying the VTS, the areas with VTS chose to "Improve or upgrade" and for those without, is to "Implement" the system. The best VTS system is the "Port and Approaches" type and the PCG is selected to operate, maintain and supervise the system. As a VTS operator, the necessity of shipboard experience is considered "Essential" and the experiences include "Ship-handling and Communication", and "Management level" experiences. The effectiveness of the assistance and services rendered by VTS are considered "Very Important". Based on these findings, this study recommends improvement of education and training of mariners and users of the waterways including the training of VTS operators manning the VTS centers, strict enforcement of ship safety regulations along the busy and main ports of the country and installation of VTS system with the most appropriate type with the supervision of PCG.