일본은 식민지 경영 과정에서 조선의 자원을 개발하고 생산력을 높이 기 위한 대안으로 북선의 개척 가능성에 대해 고민했다. 북선을 둘러싼 담론은 정치·경제적인 배경에 의해 1920년대 중후반부터 본격적으로 시 작되었다. 1930년대 이르러 철도교통망이 안정됨에 따라 접근성이 높아 지고 만주국의 건설과 더불어 한반도 북선 지역의 중요성은 더욱 강조되 었다. 본고는 이러한 기행 담론을 토대로 1930년대 초반 조선을 여행한 야마모토 사네히코(山本実彦)의 기행문 『만·선(満·鮮)』(1932)을 분석하였 다. 그가 한반도의 북선일대에 관심을 가진 이유는 무엇이었는지를 밝히 고 조선에 대한 특별한 인식에 대해 살펴보았다. 사네히코는 북선의 개 발을 통해 일본이 조선의 영토를 지나지 않고도 대륙으로 손쉽게 진출하 는 이른바 ‘북선루트’를 실현하는 일에 관심을 가졌으며 이를 통해 동아 시아 전역으로 뻗어나가는 제국 일본을 꿈꾸었다. 또한 그는 북선을 상 징하는 명산 백두산에 대해서도 새로운 관점을 견지하고 있었는데 어떤 면에서 새로운 것인지 그 원인에 대해서도 고찰해보고자 한다.

본 연구는 대학교에서 국악을 전공한 20~30대의 진로장벽과 진로 스트레스의 관계에서 진로성숙도의 매개효과를 검증하기 위한 목적으로 진행되었다. 이를 위해 전국의 20~30대 국악전 공자를 대상으로 온라인 설문조사를 실시하였으며 178부의 유 효응답을 분석하였다. 연구결과 첫째, 대상자들의 진로장벽과 진로성숙도의 평균은 3점 이상으로 보통 이상으로 나타났다. 둘째, 주요 변인 간 상관관계 분석을 통해 진로장벽은 진로 스 트레스에 높은 정적 상관관계를 보였고, 진로장벽과 진로성숙 도는 유의한 부적 상관관계로 나타났다. 진로성숙도는 하위요 인별로는 영향의 방향성이 다른 것으로 나타났으나 전체적으로 는 진로 스트레스에 부의 영향을 미치는 것으로 확인되었다. 셋째, 진로장벽과 진로 스트레스의 관계에 있어 매개변수인 진 로성숙도의 매개효과가 통계적으로 유의하지 않은 것으로 확인 되었다. 이를 바탕으로 본 연구의 한계점과 후속 연구를 위한 제언을 논의하였다. 연구결과를 기초로 국악전공자의 개인적 문제와 불안정한 직업 환경, 대학 내 진로지도의 부족 등 환경 적 문제의 개선을 위한 진로 연구가 촉진되기를 기대한다.

In this study, we conduct a multi-frequency analysis of the gamma-ray bright blazar 1308+326 from February 2013 to March 2020, using the Korean VLBI Network at 22 and 43 GHz and gamma-ray data from the Fermi Large Area Telescope (LAT). Our findings reveal spectral variations around the 2014 gamma-ray flare, aligning with the shock-in-jet model. A strong correlation is observed between gamma-ray and 43 GHz emissions, with a 27-day lag in the VLBI core light curve, indicating a 50-day delay from the beginning of a specific radio flare to the gamma-ray peak. This radio flare correlates with a new jet component, suggesting the 2014 gamma-ray flare resulted from its interaction with a stationary component. Our analysis indicates the 2014 gamma-ray flare originated 40–63 parsecs from the central engine, with seed photons for the gamma-ray emission unlikely from the broad-line region.

The purpose of this study is to provide basic data for the production of jackets with high fit by comparing and analyzing the adhesive and non-adhesive production methods of men's jackets. An analysis of the manufacturing method showcased differences between the adhesive and non-adhesive manufacturing methods in the cutting and wick attachment method, the shape and attachment method of the chest reinforcing wick, the sleeve attachment method, and the shoulder pad and sleeve reinforcing cloth attachment method. In evaluating the outfit, the overall fit of the shoulder, the fit of the chest, and the fit of the armpit were found to be high in the non-adhesive production method. In evaluating appearance evaluation, the front shoulder, chest, and sleeve overall appearance showed a high non-adhesive production method. Therefore, in order to increase the wearability of the shoulder pad and the the attachment method of the upper sleeve reinforcing cloth, the non-adhesive production method should be used, and in order to increase the overall wearability and armpit wear of the chest, the difference in the attachment method, and the reinforcement method of the armhole should be used. In addition, to increase the appearance of the jacket, non-adhesive production methods such as differences in wick attachment methods, shoulder pads, sleeve reinforcing cloth, and sleeve attachment methods should be used.

Liquified hydrogen is considered a new energy resource to replace conventional fossil fuels due to environmental regulations by the IMO. When building tank for the storage and transportation of liquified hydrogen, materials need to withstand temperatures of -253°C, which is even lower than that of LNG (-163°C). Austenitic stainless steel mainly used to build liquified hydrogen tank. When building the tanks, both the base material and welding zone need to have excellent strength in cryogenic condition, however, manual arc welding has several issues due to prolonged exposure of the base material to high temperatures. Laser welding, which has some benefits like short period of exposure time and decrease of thermal affected zone, is used many industries. In this study, laser bead on plate welding was conducted to determine the laser butt welding conditions for STS 304 and STS 316L steels. After the BOP test, cross-section observations were conducted to measure and compare four bead parameters. These tendency result of laser BOP test can be used as conditions laser butt welding of STS 304 and STS 316L steel.

This research aims to investigate Park Kilyong’s architectural theory and critique of Gyeongseong (Seoul) buildings, expressed in his ‘Overview of Modern Buildings in Gyeongseong’ and ‘Critique of Gyeongseong Buildings’ (Samcheolli, Sept. and Oct. 1935); and ‘Architectural Form of the 100% Function’ and ‘The Modern and Architecture (1)-(4)’ (Dong-A Daily, 28 Jul. to 1 Aug. 1936). As a result, it is confirmed that Park had the functionalist theory of modern architecture, which suggests that Korean architects of the Japanese colonial period were accommodating the contemporary trend of world architecture. However, Park shows his fundamental limitations in the fact that the main content of his articles was a verbatim translation of two Japanese references (Kurata, 1927; Ishihara, 1929) without proper indications. Despite the limitations, his texts are still meaningful since he formed his own architectural theory on the basis of what he translated; and indeed his critique of Gyeongseong buildings, however simple, was based on the theory. This research makes a critical analysis of Park’s functionalist theory from both the 1930s’ and present points of view and compares his commentaries on Gyeongseong architecture with those by Ko Yu-seop (1932) and Hong Yunsick (1937), illustrating how Korea perceived architecture and modernism in 1930s.

본 연구는 1890년대부터 1930년대까지 한국 선교 현장에서 전도부인 들이 직면했지만 밝혀지지 않은 일상의 어려움을 밝혀내어, 토착 교회의 자립을 도모하는 개신교 선교정책인 네비어스 방법(Nevius Methods)의 포괄적인 이해를 목표로 한다. 통상적으로 지배적인 학계의 시점이 전도부 인들의 수고와 업적을 인정하는 것과는 달리, 본 연구는 전도부인들이 겪은 역경이 토착 교회의 자립을 장려했던 네비어스 방법과 밀접하게 연관되어 있음을 주장한다. 네비어스 방법은 토착 교회가 자립하도록 토착 교회가 스스로 토착 교회 사역자를 세우고 생활비를 부담해야 된다고 주장했다. 이 선교정책은 선교사들에게 한국 교회가 빠르게 성장하는 핵심 으로 여겨지고 있었지만 교회가 재정적인 어려움에 직면하게 될 때 교회 계층의 가장 낮은 위치에 있는 전도부인들이 종종 불리한 처우를 받게 되었다. 본 연구는 1차 원자료에 의존하여, 전도부인들의 경험을 철저하게 조사함으로써 토착 교회의 빠른 성장에 대한 선교사들의 열망과 가난한 선교현장의 혹독한 현실과의 격차에 대해 다룬다.

As the decommissioning of domestic nuclear power plants (Gori Unit 1 and Wolseong Unit 1) becomes more visible, many research projects are being conducted to safely and economically decommissioning of domestic nuclear power plants (NPPs). After permanent shutdown, decommissioning of NNPs proceeds through decontamination, cutting of main equipment, waste disposal and site restoration stages. And various technologies are applied at each stage. In particular, remote cutting of neutron induced structures (RV, RVI, etc.) is a technology used in developed countries in the cutting stage, and remote cutting has been evaluated as a core technology for minimizing workers’ radiation exposure. Generally, remote cutting technologies are divided into mechanical/thermal/electrical cutting. Among various thermal cutting technologies, plasma arc cutting (PAC) is more economical and easily to remote control than other cutting technologies, and is also effective in cutting STS304 plates. PAC is a thermal cutting technology that melts the base material at the cutting area with a plasma arc heat source and removes melted material by blowing it out with cutting gas. The cutting quality depends on the stand-off distance and power (current), material thickness, cutting speed, etc., while double arcing will occur if the cutting conditions are not suitable. A monitoring system that can confirm double arcing during remote cutting is necessary because double arcing can reduce cutting quality, increase secondary waste (increase kerf and aerosol), and cause non-cutting. In this study, we used an ultrahigh-speed camera equipped with a band-pass filter to capture clear arc shapes, and measured voltage waveforms with a data acquisition system. We studied a monitoring method that can confirm the occurrence of double arcing by synchronizing the obtained arc shape and voltage waveform, and the effects of double arcing on the STS304 plates. The results of this study are expected to be helpful in the development of the remote cutting process using plasma arc cutting when decommissioning of domestic NPPs.

The decommissioning of nuclear power plants will generate a lot of low and intermediate-level radioactive waste (LILW), and preliminary radioactive evaluation for these wastes should be carried out before decommissioning work. Mainly, Concrete, Carbon Steel, Stainless Steel-304 (SS304) and Inconel are used in many parts of nuclear power plants and considered as main resource of nuclear wastes. Depending on the material location, the number of neutrons irradiated to material varies, which can range from self-disposal waste to LILW. In this paper, activation analysis was performed to compare the radiation dose according to the presence or absence of impurity elements present in SS304. For the calculation, SS304 composition and impurity elements were used as described in the report of NUREG-3474. This report lists 41 impurity elements for SS304 and other materials. Calculation code is used ORIGEN-S module in SCALE 6.1 code. Neutron flux is used as arbitrary value that around 1E+11 level and irradiation time is set as 30 year with 10-year cooling time. In the ORIGEN-S calculation, 1g of SS304 is used for easy calculation of specific activity. The ORIGEN-S calculation results are as follows. All impurity elements contained case calculated 9.32E+07 Bq activity. In the absence of all impurity elements case and most cases shows that total Becquerel value after 10-year cooling time around 9.11E+07 Bq, and Co impurity case had larger result. The calculation was performed again by increasing the amount of impurity substances by 100 times to perform the sensitivity evaluation more reliably. Representatively, Li, N, Co, and Ba impurity elements cases were calculated to have a particularly high Becquerel. Especially Co impurity element case, a total Becquerel of 3.03E+08 was calculated. Accordingly, evaluation of impurities mixed in SS304 must be considered, and in particular, the inclusion rate for Co must be considered.

This study initiated research aligned with the body positivity movement, aiming to explore size diversity for groups facing relative size discrimination due to their deviation from average body types. Using KS adult women's apparel dimensions as a reference, jackets were developed for women in their 20s to 30s who belong to the small petite-size (S[P]) category, which is characterized by a height under 155cm (petite) and a bust-circumference from 72cm to less than 82cm (small). Using 3D virtual-fitting, we conducted experiment-pattern production and refinement and subsequent real-fitting evaluations by participants to objectively validate aesthetics and comfort. The study’s findings are as follows: First, utilizing a 3D virtual-fitting program by identifying ‘creases’ and ‘garment pressure points’ in the jacket appearance, experiment patterns were refined and real jackets were produced. This approach addressed challenges in recruiting participants with specific body types and allowed for efficient research in terms of cost and time. Second, through real-fitting evaluations, basic-fit and slim-fit jackets labeled as <79-88-150> were developed for the S(P) size. we presented ‘size spec’ and ‘ease allowance’ for jackets by waist fit. Both fits received positive evaluations with approximately 53.5cm sleeve length, and 11.7cm shoulder length. The ease allowances for the basic-fit jacket were approximately 9.2cm at the bust circumference, 12.8cm at the waist circumference, and 6cm at the hip circumference. Similarly, the slim-fit jacket exhibited ease allowances of about 4.8cm at the bust circumference, 4cm at the waist circumference, and 4cm at the hip circumference, receiving positive evaluations for aesthetics and comfort.

YSZ (Y2O3-stabilized zirconia)-based ceramics have excellent mechanical properties, such as high strength and wear resistance. In the application, YSZ is utilized in the bead mill, a fine-grinding process. YSZ-based parts, such as the rotor and pin, can be easily damaged by continuous application with high rpm in the bead mill process. In that case, adding WC particles improves the tribological and mechanical properties. YSZ-30 vol.% WC composite ceramics are manufactured via hot pressing under different pressures (10/30/60 MPa). The hot-pressed composite ceramics measure the physical properties, such as porosity and bulk density values. In addition, the phase formation of these composite ceramics is analyzed and discussed with those of physical properties. For the increased applied pressure of hot pressing, the tetragonality of YSZ and the crystallinity of WC are enhanced. The mechanical properties indicate an improved tendency with the increase in the applied pressure of hot pressing.