• 한국지하수토양환경학회지:지하수토양환경
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• 제21권3호
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• pp.1-5
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• 2016

Rhodamine B Hydrazide as a novel fluorescent and colorimetric probe exhibiting remarkably selective fluorescence enhancement toward Hg²⁺ ion over other 16 metal ions is herein introduced. The probe reacts with Hg²⁺ ion followed by its spirolactam ring-opening to give a remarkable enhancement of absorption maximum at 550 nm as well as an enhanced fluorescence intensity at 580 nm in aqueous media. Upon titration with Hg²⁺ ion in various concentration of 10~200 uM, we found that the probe shows a marked color change from colorless to pink, enabling naked-eye detection toward mercury ion. In addition, in the presence of Hg²⁺ ion, the probe gave rise to change from non-florescence to strong orange fluorescence (Off-On) with a good linearity of R²=0.97. This preliminary results demonstrate that the fluorescent chemosensor we herein introduced can open a new strategy for marked selective and sensitive detection of mercury ions in contaminated soil containing various metal ions.

• 국제초고층학회논문집
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• 제2권3호
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• pp.213-228
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• 2013

Tall buildings have been traditionally designed to be symmetric rectangular, triangular or circular in plan, in order to avoid excessive seismic-induced torsional vibrations due to eccentricity, especially in seismic-prone regions like Japan. However, recent tall building design has been released from the spell of compulsory symmetric shape design, and free-style design is increasing. This is mainly due to architects' and structural designers' challenging demands for novel and unconventional expressions. Another important aspect is that rather complicated sectional shapes are basically good with regard to aerodynamic properties for crosswind excitations, which are a key issue in tall-building wind-resistant design. A series of wind tunnel experiments and numerical simulation have been carried out to determine aerodynamic forces and wind pressures acting on tall building models with various configurations: corner cut, setbacks, helical and so on. Dynamic wind-induced response analyses of these models have also been conducted. The results of these experiments have led to comprehensive understanding of the aerodynamic characteristics of tall buildings with various configurations.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제15권11호
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• pp.4105-4121
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• 2021

Recently, malware classification based on Deep Neural Networks (DNN) has gained significant attention due to the rise in popularity of artificial intelligence (AI). DNN-based malware classifiers are a novel solution to combat never-before-seen malware families because this approach is able to classify malwares based on structural characteristics rather than requiring particular signatures like traditional malware classifiers. However, these DNN-based classifiers have been found to lack robustness against malwares that are carefully crafted to evade detection. These specially crafted pieces of malware are referred to as adversarial examples. We consider a clever adversary who has a thorough knowledge of DNN-based malware classifiers and will exploit it to generate a crafty malware to fool DNN-based classifiers. In this paper, we propose a DNN-based malware classifier that becomes resilient to these kinds of attacks by exploiting Generative Adversarial Network (GAN) based data augmentation. The experimental results show that the proposed scheme classifies malware, including AEs, with a false positive rate (FPR) of 3.0% and a balanced accuracy of 70.16%. These are respective 26.1% and 18.5% enhancements when compared to a traditional DNN-based classifier that does not exploit GAN.

• Smart Structures and Systems
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• 제21권5호
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• pp.687-694
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• 2018

The problem of wheel tread defects has become a major challenge for the health management of high-speed rail as a wheel defect with small radius deviation may suffice to give rise to severe damage on both the train bogie components and the track structure when a train runs at high speeds. It is thus highly desirable to detect the defects soon after their occurrences and then conduct wheel turning for the defective wheelsets. Online wheel condition monitoring using wheel impact load detector (WILD) can be an effective solution, since it can assess the wheel condition and detect potential defects during train passage. This study aims to develop an FBG-based track-side wheel condition monitoring method for the detection of wheel tread defects. The track-side sensing system uses two FBG strain gauge arrays mounted on the rail foot, measuring the dynamic strains of the paired rails excited by passing wheelsets. Each FBG array has a length of about 3 m, slightly longer than the wheel circumference to ensure a full coverage for the detection of any potential defect on the tread. A defect detection algorithm is developed for using the online-monitored rail responses to identify the potential wheel tread defects. This algorithm consists of three steps: 1) strain data pre-processing by using a data smoothing technique to remove the trends; 2) diagnosis of novel responses by outlier analysis for the normalized data; and 3) local defect identification by a refined analysis on the novel responses extracted in Step 2. To verify the proposed method, a field test was conducted using a test train incorporating defective wheels. The train ran at different speeds on an instrumented track with the purpose of wheel condition monitoring. By using the proposed method to process the monitoring data, all the defects were identified and the results agreed well with those from the static inspection of the wheelsets in the depot. A comparison is also drawn for the detection accuracy under different running speeds of the test train, and the results show that the proposed method can achieve a satisfactory accuracy in wheel defect detection when the train runs at a speed higher than 30 kph. Some minor defects with a depth of 0.05 mm~0.06 mm are also successfully detected.

• 대중서사연구
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• 제25권4호
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• pp.223-261
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• 2019

이 글은 페미니스트 범죄서사인 양귀자의 『나는 소망한다 내게 금지된 것을』을 1990년대 여성운동과 페미니즘의 대중화, 강남 중산층 소비 문화와 미디어 문화의 전면화를 배경으로 중산층 가정의 사회적 도덕적 규범성이 강화되는 맥락을 보여주는 텍스트로 읽고자 하였다. 이 소설의 여성 주인공인 강민주와 백승하는 모두 1990년대 텔레비전과 광고 등을 통해 대중적으로 가시화하기 시작한 강남의 거주자이다. 다른 한편으로 남녀 주인공에게 각각 할당된 페미니스트이자 강한 소비적 정체성을 지닌 여성과 부드럽고 가정적인 남성은 모두 당대 여성운동의 성장과 대중화된 페미니즘의 이슈를 체현한다. 소비주의 미디어 문화, 여성운동, 민주화의 결합은 무엇보다 중산층이라는 물질적 토대를 가시화하는 가운데 부드럽고 가정적인 남성상을 창출했다. 이 소설에서 가정적 남성상은 페미니스트 범죄 서사를 중산층 가정의 안정과 위엄을 공격하는 팜므 파탈의 서사로 전화시키며, 바로 그 전화의 순간에 강민주는 자신을 흠모해온 하층계급 남성에 의해 죽임을 당한다. 양귀자의 이 소설은 1990년대 본격화된 강남을 배경으로 한 중산층의 사회문화적 재현과 페미니즘 이슈를 중첩시킨 텍스트로서 시사적일 뿐만 아니라 징후적이다. 1990년대 말 이후 한국에서 펼쳐질 범죄 서사의 핵심 코드로서 여성 혐오 살인의 사회문화적 맥락이 무엇인지를 보여주기 때문이다.

• 대중서사연구
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• 제25권3호
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• pp.41-66
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• 2019

본고는 1980년대 문고본 로맨스 소설의 독자 상정과 출판 전략을 '하이틴'이라는 기호로 살펴보려 한다. 저널리즘에서 사용되었던 '하이틴'이라는 기호에 어떤 함의가 포함되어 있는지, 1980년대 문고본 로맨스 시리즈의 출판 현상을 통해 확인하는 것이 이 글의 목적이다. 문고본 로맨스 중에서도 캐나다 출판사 '할리퀸(Harlequin)'의 로맨스 시리즈의 해적판/정식판본과, 같은 독자를 상정하고 출간되었던 잡지 매체의 광고 홍보 문구를 토대로 연구를 진행하였다. 1970년대부터 대중매체는 10대 청소년을 하이틴으로 바라보고 이들을 중요한 소비주체로 호명한 바 있다. 하이틴이 교복을 입은 10대 청소년, 그중에서도 주로 여학생을 일컫는 용어였다면 1980년대 '하이틴' 역시 새로운 소비주체로 상정되었고, 출판 시장에서는 이들을 포섭하기 위한 여러 출판 전략을 내세웠다. 『하이틴 로맨스』를 비롯한 문고본 로맨스는, '하이틴'이라는 독자들을 10대 후반 여학생, 베스트셀러/밀리언 셀러에 민감한 소비주체, 사랑과 연애 이야기를 독서하는 취향을 가지며, 미·서구 문화에 호의적인 독자로 상정하였다. 1980년대 이후 문고본 로맨스 시장은 침체되었지만, 독자들은 '할리퀸' 시리즈를 수용-로컬화하여 '로맨스'라는 장르소설의 명맥을 계속해서 유지해왔다. 웹소설이라는 새로운 매체가 부상함에 따라 로맨스 장르에 대한 관심이 폭증하는 현재, 이 연구가 (여성)독자와 로맨스 독서/향유에 대한 다양한 논의를 이끌어내는 시작점이 될 것이라 기대한다.

• 만화애니메이션 연구
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• 통권50호
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• pp.23-42
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• 2018

2차원문화(二次元文化)는 현재 중국 콘텐츠 시장의 핵심 키워드이다. 중국에서는 2차원문화에 대한 이용자가 날로 증가하며 대중들의 관심이 고조되고 있다. 또한 콘텐츠 시장에서의 인기로 인해 많은 자본을 투자하고 있는 실정이다. 2차원문화가 주류문화로 부상한 이유는 주류 소비자층의 전환뿐만 아니라, 첫째로는 2차원문화가 ACGN(Animation, Comic, Game, Light Novel) 외에도 영화, 공연, 테마파크 등 많은 영역 까지 아우른 거대한 산업사슬을 형성하고 있는 것, 둘째로는 사회적 환경과 충성도가 높은 특정 수용자들로 인해 더욱 더 많은 사람들이 2차원문화 행렬에 가담하고 있는 것, 셋째로는 문화의 전파성이 강한 등 세 가지 특징으로부터 2차원문화 콘텐츠에 있어서 수용자의 역할을 찾아보았고, PEST(거시환경 분석)를 통하여 정치, 경제, 사회, 기술 등 네 가지 측면으로 중국 2차원문화 환경을 분석하였다. 또한 2차원문화 수용자들의 생태환경과 소통방식이 변화되면서 수용자는 능동적 참여자이자 콘텐츠의 재생산자로 부각되었는데, 이러한 수용자 콘텐츠 이용방식을 '탄막(弹幕)'현상으로 살펴보았다. 따라서 본 연구는 중국 2차원문화 환경에서 수용자 중심의 콘텐츠산업에 대한 적절한 발전 경로를 논의하는 시사점이 있다.

• Journal of Advanced Marine Engineering and Technology
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• 제38권2호
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• pp.217-224
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• 2014

We have developed the novel device that can extract energy from ocean waves utilizing the heaving motion of a floating mass. The major components of the energy converter are: a floater, a counterweight, a cable, a driving pulley, two idler pulleys, a ratchet, and a generator. The device generates power through the tension force in the cable and the weight difference between the floater and the counterweight. When the system is at static free condition, the tension in the cable is equal to the weight of the counterweight which is minimum. Therefore it is desirable to keep the counterweight lighter than the floater. However, experiments show that during the rise of the water level, the torque generated by weight of the counterweight is insufficient to rotate the driving pulley which causes the cable on the floater side to slack. The proposed application of the tension pulley rectifies these problems by preventing the cable from becoming slack when the water level rises. In this paper, the dynamics model is modified to incorporate the dynamics of the tension pulley. This has been achieved by first writing the dynamical equations for the tension pulley and the energy converter separately and combining them later. This paper investigates numerically the effect of the tension pulley on various physical quantities such as the cable tension, the floater displacement, and the floater velocity. Results obtained indicate that this application is successful in suppressing large fluctuations of the cable tension.

• Earthquakes and Structures
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• 제18권3호
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• pp.367-377
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• 2020

Incremental dynamic analysis (IDA) widely uses for the collapse risk assessment procedures of buildings. In this study, an IDA-based collapse risk assessment methodology is proposed, which employs a novel approach for detecting the near-collapse (NC) limit state. The proposed approach uses the modal pushover analysis results to calculate the maximum inter-story drift ratio of the structure. This value, which is used as the upper-bound limit in the IDA process, depends on the structural characteristics and global seismic responses of the structure. In this paper, steel midrise intermediate moment resisting frames (IMRFs) have selected as case studies, and their collapse risk parameters are evaluated by the suggested methodology. The composite action of a concrete floor slab and steel beams, and the interaction between the infill walls and the frames could change the collapse mechanism of the structure. In this study, the influences of the metal deck floor and autoclaved aerated concrete (AAC) masonry infill walls with uniform distribution are investigated on the seismic collapse risk of the IMRFs using the proposed methodology. The results demonstrate that the suggested modified IDA method can accurately discover the near-collapse limit state. Also, this method leads to much fewer steps and lower calculation costs rather than the current IDA method. Moreover, the results show that the concrete slab and the AAC infill walls can change the collapse parameters of the structure and should be considered in the analytical modeling and the collapse assessment process of the steel mid-rise intermediate moment resisting frames.

• Earthquakes and Structures
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• 제27권1호
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• pp.17-29
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• 2024

The traditional double story isolated structure is a derivative of the base isolated and inter-story isolated structures, while the new double story isolated structure represents a novel variation derived from the traditional double story isolated structure. In order to investigate the seismic response of the new double story isolated structure, a comprehensive structural model was developed. Concurrently, models for the basic fixed, base isolated, inter-story isolated, and traditional double story isolated structures were also established for comparative analysis. The nonlinear dynamic time-history response of the new double story isolated structure under rare earthquake excitations was analyzed. The findings of the study reveal that, in comparison to the basic fixed structure, the new double story isolated structure exhibits superior performance across all evaluated aspects. Furthermore, when compared to the base isolated and inter-story isolated structures, the new double story isolated structure demonstrates significant reductions in inter-story shear force, top acceleration, and inter-frame displacement. The horizontal displacement of the new double story isolated structure is primarily localized within the two isolation layers, effectively dissipating the majority of input seismic energy. In contrast to the traditional double story isolated structure, the new design minimizes displacements within the inter-isolation layer situated in the central part of the frame, as well as mitigates the overturning forces acting on the lower frame column. Consequently, this design ensures the structural integrity of the core tube, thereby preventing potential collapse and structural damage.