Most fishing nets used in fish cage aquaculture are made of synthetic fibers such as polyamide (PA) and polyethylene (PE). Therefore, it is challenging to maintain the internal volume of the fish cage due to biofouling, which can increase the load on the cage or reduce dissolved oxygen levels by impeding smooth current flow. To address this issue, research has been conducted to replace conventional synthetic fiber cage nets with brass nets, demonstrating certain benefits such as improved productivity and ease of fish cage management. However, given the need for a more thorough examination of brass fishing net weaving technology and performance, this study assessed the optimal weaving method for brass fishing nets to be used in fish cages. Additionally, it provided essential data for the practical application of brass fishing nets by evaluating their weight, tensile strength, elongation, fatigue resistance, and wear resistance. The study concluded that weaving brass fishing nets using the chain link method ensures durability, ease of installation, and compact storage in a scroll-like form. Moreover, due to their superior fatigue and wear resistance properties, brass nets can offer increased utility if appropriate net diameter and length are selected to compensate for their higher weight per unit area and relatively higher cost compared to existing fiber fishing nets.

The model ship of this study, the Baek-Kyung fisheries training ship of Pukyong National University, has a length between perpendiculars of 85 meters, making it not subject to the IMO maneuverability standards. However, understanding the maneuvering characteristics of the vessel is essential for safe navigation. In this regard, this study was conducted to analyze the results from the sea trials of the model ship conducted in accordance with the IMO maneuverability standards. The results of the turning tests met the standards well while in the zig-zag tests, the first overshoot angle exceeded the standard in the 10°/10° test; however, such results met with a difference of 1.8° in the 20°/20° test. Additionally, using the course-stability discrimination formula, the calculated value was -0.0051, indicating unstable course-stability. The results of the stopping tests met the standards well. It is hoped that the analyzed maneuvering characteristics of the model ship from the study results will contribute to the safety of ship navigation.

This study aimed to quantitatively analyze the risk using data from 329 safety accidents that occurred in aquaculture fisheries management vessels over the recent five years (2018-2022). For quantitative risk analysis, the Bayesian network proposed by the International Maritime Organization (IMO) was used to analyze the risk level according to the fishing process and cause of safety accidents. Among the work processes, the fishing process was analyzed to have the highest risk, being 12.5 times that of the navigation, 2.7 times that of the maintenance, and 8.8 times that of the loading and unloading. Among the causes of accidents, the hull and working environment showed the highest risk, being 1.7 times that of fishing gear and equipment, 4.7 times that of machinery and equipment, and 9.4 times that of external environment. By quantitatively analyzing the safety accident risks for 64 combinations of these four work processes and four accident causes, this study provided fundamental data to reduce safety accidents occurring in aquaculture fisheries management vessels.

This study employs Bayesian network analysis to quantitatively evaluate the risk of incidents in trap boats, utilizing accident compensation approval data spanning from 2018 to 2022. With a dataset comprising 1,635 incidents, the analysis reveals a mortality risk of approximately 0.011 across the entire trap boat. The study significantly identifies variations in incident risks contingent upon fishing area and fishing processes. Specifically, incidents are approximately 1.22 times more likely to occur in coastal compared to offshore, and the risk during fishing processes outweighs that during maintenance operations by a factor of approximately 23.20. Furthermore, a detailed examination of incident types reveals varying incidence rates. Trip/slip incidents, for instance, are approximately 1.36 times more prevalent than bump/hit incidents, 1.58 times more than stuck incidents, and a substantial 5.17 times more than fall incidents. The study concludes by providing inferred mortality risks for 16 distinct scenarios, incorporating fishing areas, processes, and incident types. This foundational data offers a tailored approach to risk mitigation, enabling proactive measures suited to specific circumstances and occurrence types in the trap boat industry.

We analyzed risk factors of coastal gillnet fishers during fishing process and considered work safety measures to reduce safety accidents during fishing using a UWB (ultra wideband) based positioning system. The static position accuracy of the UWB based positioning system was 45 cm. When entering a port, there is a risk of falling overboard. When casting a net, there was a risk of falling overboard due to being hit by fishing gear or guards, or getting caught in a buoy line or sinker line. When hauling a net, there is a risk of getting caught between fishing gear and net hauler, and the risk of musculoskeletal disorders due to repetitive work over a long period of time. Most safety accidents during work on fishing boats are blamed on human errors of the fisher and skipper, but safety accidents occur due to a mixture of mechanical and equipment factors, work and environmental factors, and management factors in addition to human errors. Therefore, the 4E were presented as countermeasures against the 4M, which are causes of safety accidents, and the proposed measures were used to identify risk factors for operation process, comply with work safety rules, and ensure the wearing of personal protective equipments. We need to reduce safety accidents during work by making it part of our daily routine. These research results can be used in the future for optimal placement of fishing gear and fishing nets in other coastal industries where safety accidents occur frequently.

본 논문은 멘델바움의 생애사 분석방법을 통한 장마당 세대인 기독 탈북청년의 독일정착을 분석함으로써 이주 동기와 적응 과정과 신앙여정을 전반적으로 살펴보는 데 의의가 있다. 이러한 연구목적을 달성하기 위해서 첫째, “기독 탈북청년의 삶의 영역은 어떠한가?” 둘째, “기독 탈북청년의 삶의 전환점은 무엇이며 이를 가능하게 한 개인적·사 회적·국가적 조건들은 무엇인가?” 셋째, “기독 탈북청년의 독특한 적응 방법은 무엇인가?”라는 연구문제를 설정하였다. 연구참여자 A의 삶의 영역은 「북한에서의 행복한 삶」, 「이방인의 마음을 경험한 한국」, 「유학과정에서 다시 만난 하나님」, 「독일정착을 위한 노력」, 「결혼을 통한 새로운 시작」으로 나눌 수 있다. 삶의 전환점은 「가족과 함께한 탈북」, 「외국인 교환학생들과의 만남」, 「크리스천들의 도움」, 「뜻밖의 결혼」으로 나타났다. 삶의 적응은 「모든 상황을 긍정적으로 생각하기」, 「노력하면 꿈을 이룰 수 있다는 믿음」, 「관계를 중시하는 삶」, 「다문화 사회에 대한 열정적인 호기심」으로 분류되었다. 참여자 A의 신앙여정은 롤러코스터와 같았지만 결국은 믿음을 회복하고 독일에서 신실한 교인 으로 살아가고 있다. 끝으로 위의 연구결과들을 바탕으로 탈북청년들의 해외 이주 및 적응과 신앙여정에 관하여 제언하였다.

Piloti-type structures with vertical irregularity are vulnerable to earthquakes due to the soft structure of the first story. Structural characteristics of buildings can significantly affect the seismic loss function, calculated based on seismic fragility, and therefore need to be considered. This study investigated the effects of the number of stories and core locations on the seismic loss function of piloti-type buildings in Korea. Twelve analytical models were developed considering two variations: three stories (4-story, 5-story, and 6-story) and four core locations (center core, x-eccentric core, y-eccentric core, and xy-eccentric core). The interstory drift ratio and peak floor acceleration were assessed through incremental dynamic analysis using 44 earthquake records, and seismic fragility was derived. Seismic loss functions were calculated and compared using the derived seismic fragility and repair cost ratio of each component. The results indicate that the seismic loss function increases with more stories and when the core is eccentrically located in the piloti-type structure model. Therefore, the uncertainty due to the number of stories and core location should be considered when deriving the seismic loss function of piloti-type structures.

Recently, domestic fishing production of Japanese horse mackerel has been continuously decreasing. To achieve sustainable fishing of this species, it is essential to acquire its target strength (TS) for accurate biomass estimation and to study its ecological characteristics. To date, there has been no TS research using a broadband echosounder targeting Japanese horse mackerel. In this study, for the first time, we synchronized an underwater camera with a broadband frequency (nominal center frequency of 200 kHz, range: 160-260 kHz) to measure the TS according to the body size (16.8-35.5 cm) and swimming angle of the species. The relationship between Japanese horse mackerel length and body weight showed a general tendency for body weight to increase as length increased. The pattern of the frequency spectra (average values) by body length exhibited a similar trend regardless of body length, with no significant fluctuations in frequency observed. The lowest TS value was observed at 243 kHz while the highest TS values were recorded at 180 and 257.5 kHz. The frequency spectra for the swimming angles appeared to be flat at angles of –5, 0, 30, 60, 75, and 80° while detecting more general trends of frequency spectra for swimming angle proved challenging. The results of this study can serve as fundamental data for Japanese horse mackerel biomass estimation and ecological research.

Earthquakes of magnitude 3.0 or greater occur in Korea about 10 times on average yearly, and the number of earthquakes occurring in Korea is increasing. As many earthquakes have recently occurred, interest in the safety of nuclear power plants has increased. Nuclear power plants are equipped with many cabinet-type control facilities to regulate safety facilities, and function maintenance is required during an earthquake. The seismic performance of the cabinet is divided into structural and functional performances. Structural performance can be secured during the design procedure. Functional performance depends on the vibration performance of the component. Therefore, it is necessary to confirm the seismic performance of the components. Generally, seismic performance is confirmed through seismic simulation tests. When checking seismic performance through seismic simulation tests, it is difficult to determine the effect of frequency and maximum acceleration on an element. In this paper, shaking table tests were performed using various frequencies and various maximum accelerations. The seismic performance characteristics of the functions of electrical equipment components were confirmed through tests.

In this study, the SBC system, a new mechanical joint method, was developed to improve the constructability of precast concrete (PC) beam-column connections. The reliability of the finite element analysis model was verified through the comparison of experimental results and FEM analysis results. Recently, the intermediate moment frame, a seismic force resistance system, has served as a ramen structure that resists seismic force through beams and columns and has few load-bearing walls, so it is increasingly being applied to PC warehouses and PC factories with high loads and long spans. However, looking at the existing PC beam-column anchorage details, the wire, strand, and lower main bar are overlapped with the anchorage rebar at the end, so they do not satisfy the joint and anchorage requirements for reinforcing bars (KDS 41 17 00 9.3). Therefore, a mechanical joint method (SBC) was developed to meet the relevant standards and improve constructability. Tensile and bending experiments were conducted to examine structural performance, and a finite element analysis model was created. The load-displacement curve and failure pattern confirmed that both the experimental and analysis results were similar, and it was verified that a reliable finite element analysis model was built. In addition, bending tests showed that the larger the thickness of the bolt joint surface of the SBC, the better its structural performance. It was also determined that the system could improve energy dissipation ability and ductility through buckling and yielding occurring in the SBC.

Fish resource surveys were conducted near Jeju Island in June, August and October 2021 using an underwater camera monitoring system, fish pots, and SCUBA diving methods. The efficiency of the methods used to survey fish resources was compared using the number of individuals compared to area per unit time (inds/m3/h) and the number of species compared to area per unit time (spp./m3/h). As a result of comparing the number of individuals compared to the area per unit time (inds/m3/h), the order was underwater camera 214.69, SCUBA diving 124.62, and fish pots 0.57 inds/m3/h. The number of species compared to area per unit time (spp./m3/h) is in the following order: SCUBA diving 0.85, underwater camera 0.38, and fish pots 0.01 spp./m3/h. The fish resource monitoring method using underwater cameras was found to be more efficient in individual counts, and the SCUBA diving method was found to be more efficient in species counts. When considering cost and survey efficiency, the fish resource survey method using underwater cameras was judged to be more effective. The results of this study are expected to be widely used in estimating the population density of fish, which is the core of future fisheries resource surveys.

A variation of fish assemblage in the coastal waters of Sagye-ri, southern Jeju Island was determined using samples collected by trammel net from 2012 to 2022. The total fish species caught by trammel net were identified 88 species, 46 families, 12 orders, and the number of appearance and biomass were 3,479 individuals and 883.6 kg. The annual variation of species was the highest in 2013 at 46 species and the lowest in 2021 at 30 species. The seasonal variation of species was higher in summer at 67 species and lower in winter, autumn at 47 species. The annual diversity index, evenness index, and richness index were appeared 2.42-3.00, 0.69-0.78 and 5.18-7.24 at each years. The dominance index appeared highest in 2013 and the lowest in 2018. Cluster analysis based on the number of individuals of fish was classified into two groups at the dissimilarity level of 57%, and results of SIMPROF analysis revealed significant differences in community structure among the two groups. The subtropical fishes were identified a total of 42 species (47.7%) and the number of species was higher in 2013 at 25 (54.3%) species and lower in 2018 and 2021 at each 17 (54.8~56.7%) species. The dominant species of subtropical fishes were appeared rabbit fish (Siganus fuscescens), scarbreast tuskfish (Choerodon azurio), bluestriped angelfish (Chaetodontoplus septentrionalis), balloon fish (Diodon holocanthus), and flag fish (Goniistius zonatus) at study sites.

This study investigated the species composition and community structure of aquatic organisms captured using coastal beam trawling in Gomso Bay, Jeollabuk-do, from January to December 2022. Throughout the experimental period, a total of 20,246 individuals belonging to 94 marine species were captured, with a combined biomass of 602,828 g. Fish exhibited the highest abundance, comprising 56 species, followed by crustacea (21 species), bivalvia (8 species), cephalopoda (5 species), gastropoda (3 species), and holothuroidea (1 species). The dominant species was Leiognathus nuchalis, constituting 14.0% of the total individuals, followed by Portunus trituberculatus at 12.1%, Oratosquilla oratoria at 10.4%, Crangon hakodatei at 9.9%, and Metapenaeus joyneri at 7.9%. The diversity index ranged from 1.72 to 2.55, with the lowest diversity observed in March and the highest in July. Cluster analysis based on species composition of the 27 most common species showed that aquatic organisms were divided into three groups: spring and summer organisms (Group A) and summer organisms (Group B) and autumn and winter organisms (Group C).

본 연구는 1960년대에 향수(Nostalgia) 주제를 가진 트로트 곡의 특징을 연구하였다. 1960년대 트로트 가사가 고향에 대한 향수를 어떤 방식으로 다뤘으며, 해당 트로트 가사가 의미하는바가 무엇인지를 고찰하였다. 그리고 고향에 대한 그리움과 회상을 표현하는 가사 속 단어들 및 타향을 부정하는 단어들 속에 내재된 감정을 분석하였다. 본 연구는 트로트 곡에서 드러나는 고향에 대한 향수에 관한 내용의 가사를 분석함으로써, 가사 분석의 다양성을 고찰하는 것에 목적을 두고 있 다. 1960년대 트로트 가사에는 고향에 대한 그리움과 회상 그리고 가족과 연인에 대한 사랑이 주 로 나타났으며 한국적 정서가 드러나는 시대를 반영한 이야기들을 표현한 단순 명료한 가사로 이 루어져있었다. 또한 1970년대에는 추상적인 이별이야기를 담는데 주력하는 양상을 보인 반면, 1960년대에는 직접적인 단어로 표현함으로써 곡의 애절함과 씁쓸함이 보다 더 잘 드러났으며 대중 들 기억에 남는 가사로 공감을 더했다. 대중가요에서 고향을 주제로 한 가사에서는 사람의 감성을 움직이게 하며 향수를 불러일으키지만 시대적 배경과 대중들의 상황과 상태, 염원을 분석한다면 가사에 담긴 함의를 구체적으로 파악할 수 있으며 많은 창작자들이 가사를 분석하는 것에 도움이 될 것이라고 예상한다.

본 연구는 한국수어 교육의 양적 확장이 이뤄졌음에도 농인들과의 의사소통이 가능한 청인들이 증가하지 않은 이유를 한국수어 교재의 문제점들에 주목하였다. 한국수어 교재들이 언어학적인 교육과정을 담아내야 한다는 전제하에 한국수어 교재들과 미국수어 교재들을 비교 분석하여 이를 토대로 한국수어 교재의 재구조 화 방안을 제시하는 데에 연구목적을 설정하였다. 분석 대상은 한국수어 교재 12권과 미국수어 교재 2권이었 다. 연구 결과, 외적 구성과 교재 내적인 차원에서의 전체 구성, 학습 내용에서의 주제와 어휘 및 회화 영역에서 한국과 미국 교재들 간의 뚜렷한 차이를 발견하였다. 이에 따른 몇 가지 논의사항은 첫째, 미국수어 교재의 외적 구성은 미국농인이 익숙하며 선호하는 시각적 정보화에 충실했다는 것이다. 둘째, 한국수어 교재들은 미국수어 교재들에 비해 내적 구성에서 ‘계속성’과 ‘계열성’이 미흡하였다. 셋째, 양질의 수어교재 들이 미국에서 개발될 수 있었던 계기들로는 수십 년에 걸친 기초연구들이 뒷받침되어 있었다. 넷째, 언어 교수·학습을 위한 교재가 학습자들에게 유용하도록 짜임새 있게 구성되기 위해서는 언어이론에 근거한 교재를 개발해야 한다. 본 연구의 제언으로는 첫째, 현재 진행 중인 국립국어원에서 발주하여 전문 연구진에 의해 연구되고 있는 한국수어능력 등급별 평가기준 마련, 한국수어교원 2급 교육과정 개선, 한국수어교원 1급 교육과정 개발 등이 최대한 빨리 이뤄져야 한다. 둘째, 미국수어 교재에서 적용하는 농인 친화적인 외적 구성 형태를 모범으로 삼아야 한다. 셋째, 학습 주제, 학습 어휘 및 회화 등 실제 학습 내용을 구성하게끔 하는 한국수어 교육과정의 이론과 방법이 모색되어야 한다. 넷째, 기존 교재들의 재구조화와 그에 따른 향후 신규 개발된 한국수어 교재들을 지속적으로 평가하는 지침과 기준이 마련되어야 한다.

일반적으로 한국기독교의 농촌계몽운동은 1920년대에 시작하여 1930년대에 소멸한 것으로 알려져 있다. 엄밀하게 말하자면 한국기독 교의 농촌계몽운동은 1920년대부터 1930년대까지 전성기를 경험한 것이 맞다. 하지만 이보다 앞서 농촌계몽운동에 관심을 가지고 나름의 역할들을 해온 두 인물이 있는데, 그 두 사람은 바로 윤치호와 로버트 알렉산더 하디 선교사이다. 본 논문에서는 같은 남감리회 소속이었던 윤치호와 하디 선교사가 농촌계몽운동에 관심을 갖게 된 시기와 이유, 그리고 구체적인 활동을 우선 살펴보고, 이들이 목표했던 농촌계몽운동 은 단순히 경제적인 발전만을 추구하는 것이 아니라 누구나 자신의 재능을 개발하고 더불어 행복한 삶을 살아갈 수 있도록 의식을 변화시키 는 하나의 사회변혁운동이었음을 고찰하고자 한다. 이를 통해 생명 경시, 자살률 증가, 인간 소외현상 등이 만연한 21세기의 대한민국에서 한국기독교(개신교)가 진정한 계몽운동의 주역으로 자리매김하는 데 이바지하기를 바란다.

본 연구는 신흥시장에서 활동하는 자회사 CEO의 기업가정신 지향성이 자회사 성과에 미치는 영향에 개방형 혁신과 자회사 자율성이 미치는 매개효과를 검증함으로써, 자회사 성과에 CEO의 특성뿐만 아니라 조직의 특성이 자회사 성과에 어떤 영향을 주는지 살펴보았다. 본 연구는 중동과 중국에 진출한 한국기업 자회사를 상대로 설문 조사를 진행한 후, 305개의 유효표본을 PLS-SEM을 통해 검증을 진행하였다. 첫째, 자회사 CEO 기업가정신 지향성은 자회사 성과에 긍정적인 영향을 미쳤다. 둘째, 자회사 자율성은 자회사 CEO 기업가정신 지향성과 자회 사 성과의 관계에 매개효과를 주지 못했다. 셋째, 개방형 혁신은 자회사 CEO 기업가정신 지향성과 자회사 성과의 관계에 매개효과를 주는 것으로 나타났다. 본 연구는 CEO의 기업가정신 지향성이라는 특성이 자회사의 조직적 상황 요인에 의한 매개효과를 입증하여 기존 연구를 확장하였다. 추가로, 본 연구는 자회사 CEO의 기업가정신 지향성의 중요성을 밝힘으로써 본사에서 자회사의 CEO를 선정할 때 고려해야 할 주안점을 제시하였고, 신흥시 장에 진출한 자회사의 성과를 증진할 수 있는 방안으로 개방형 혁신을 제안하였다.

오늘날 도시선교가 어느 사역보다도 필요한 것은 도시로 몰려드는 이주민들의 행렬이 크게 나타나 도시의 세속화와 빈부의 격차 문제로 인해 선교적인 해결이 필요하기 때문이다. 도시선교사역이 지금도 한국교회 선교전략의 중심이 되어야 하는 것은 도시로 몰려드는 청년선 교를 위한 것이다. 팀 켈러(Tim J. Keller)는 오늘날의 도시선교가 지상위임명령의 성취의 중요한 사역임을 강조하고 뉴욕 맨해튼에서 리디머장로교회를 개척하고 목회하였다. 팀 켈러는 포스트모던 세대인 도시의 젊은이를 전도하기 위한 교회를 개척하고 현대 사회에 필요한 선교적 교회의 목회 방법으로 6가지의 모습을 제시하였다. 첫째, 선교 적 교회는 사회 속 우상들을 대면해야 한다. 둘째, 선교적 교회는 능숙하게 상황화하며 언어로 커뮤니케이션해야 한다. 셋째, 선교적 교회는 그리스도인 삶의 모든 영역에서 선교의 삶을 살도록 훈련시켜야 한다. 넷째, 선교적 교회는 공익을 위해 대응문화(Counter-culture) 여야 한다. 다섯째, 선교적 교회는 스스로 상황화 되어야 하고 비신자나 구도자 등이 교회 생활과 사역에 대부분 연관될 수 있도록 해야 한다. 여섯째, 선교적 교회는 반드시 일치를 실천해야 함을 강조하였다.