The purpose of this study is to present the direction of the plan to transform the residential complex into a space that can provide an open residential environment that can lead to social communication and exchange without being closed to the urban residential environment, especially in the apartment complex environment, which is becoming more dense. As a result of the Openness analysis of the ‘Codan Shinonome Canal Court’, the overall accessibility was good in terms of space utilization, and the openness was low in terms of the spatial composition, which is a physical environment due to the dense block type. When looking at the overall openness of the Codan Sinonome complex in terms of analysis by block, the corrected openness index (C.O.I) for all six blocks was 0.245, the corrected accessibility index (C.A.I) was 1.447 and the openness composite index (O.C.I) was assessed at 1.692. This was due to the formation of high-density block-type urban dwellings and the introduction of S-shaped streets and the layout of low-rise urban support facilities and commercial facilities. The Codan Sinonome Canal Court, which is considered an “open city residence,” quantitatively confirmed that it embodies macro-space structure and human-scale space environment even in high-precision environments.

Recently, high-entropy carbides have attracted considerable attention owing to their excellent physical and chemical properties such as high hardness, fracture toughness, and conductivity. However, as an emerging class of novel materials, the synthesis methods, performance, and applications of high-entropy carbides have ample scope for further development. In this study, equiatomic (Hf-Ti-Ta-Zr-Nb)C high-entropy carbide powders have been prepared by an ultrahigh- energy ball-milling (UHEBM) process with different milling times (1, 5, 15, 30, and 60 min). Further, their refinement behavior and high-entropy synthesis potential have been investigated. With an increase in the milling time, the particle size rapidly reduces (under sub-micrometer size) and homogeneous mixing of the prepared powder is observed. The distortions in the crystal lattice, which occur as a result of the refinement process and the multicomponent effect, are found to improve the sintering, thereby notably enhancing the formation of a single-phase solid solution (high-entropy). Herein, we present a procedure for the bulk synthesis of highly pure, dense, and uniform FCC single-phase (Fm3m crystal structure) (Hf-Ti-Ta-Zr-Nb)C high-entropy carbide using a milling time of 60 min and a sintering temperature of 1,600oC.

Conventionally, metal materials are produced by subtractive manufacturing followed by melting. However, there has been an increasing interest in additive manufacturing, especially metal 3D printing technology, which is relatively inexpensive because of the absence of complicated processing steps. In this study, we focus on the effect of varying powder size on the synthesis quality, and suggest optimum process conditions for the preparation of AlCrFeNi high-entropy alloy powder. The SEM image of the as-fabricated specimens show countless, fine, as-synthesized powders. Furthermore, we have examined the phase and microstructure before and after 3D printing, and found that there are no noticeable changes in the phase or microstructure. However, it was determined that the larger the powder size, the better the Vickers hardness of the material. This study sheds light on the optimization of process conditions in the metal 3D printing field.

Nuclear power plants in Korea were designed and evaluated based on the NRC's Regulatory Guide 1.60, a design response spectrum for nuclear power plants. However, it can be seen that the seismic motion characteristics are different when analyzing the Gyeongju earthquake and the Pohang earthquake that has recently occurred in Korea. Compared to the design response spectrum, seismic motion characteristics in Korea have a larger spectral acceleration in the high-frequency region. Therefore, in the case of equipment with a high natural frequency installed in a nuclear power plant, seismic performance may be reduced by reflecting the characteristics of domestic seismic motions. The failure modes of the equipment are typically structural failure and functional failure, with an anchorage failure being a representative type of structural failure. In this study, comparative analyses were performed to decide whether to consider the inelastic behavior of the anchorage or not. As a result, it was confirmed that the seismic performance of the anchorages could be increased by considering the inelastic behavior of an anchorage.

This paper analyzes the Korean conjunctives –ko and –ese, and the Turkish converb –Ip, which have various meanings, and reveals their similarities and differences visually using the semantic map model. –ko and –ese are learned at the beginner level but Turkish learners have shown many errors. Those two Korean conjunctives express different temporal meanings, however, the corresponding Turkish converb expressed them in a single form. Korean textbooks have introduced the meanings of –ko and –ese as [sequential] and [continuous], but it can be made more confusing for learners by presenting the meaning using the same term. Therefore, it is necessary to teach the meanings of the two connectives in more detail according to their syntactic characteristics. Since most textbooks of Korean do not clearly present the differences between the –ko and –ese, effective teaching methods for Turkish-speaking learners based on the Focus-on-Form approach are proposed. To teach the conjunctives –ko and –ese, distinguishing between features of different meanings and to recognize those differences is encouraged.

We fabricate the non-equiatomic high-entropy alloy (NE-HEA) Fe49.5Mn30Co10Cr10C0.5 (at.%) using spark plasma sintering under various sintering conditions. Each elemental pure powder is milled by high-energy ball milling to prepare NE-HEA powder. The microstructure and mechanical properties of the sintered samples are investigated using various methods. We use the X-ray diffraction (XRD) method to investigate the microstructural characteristics. Quantitative phase analysis is performed by direct comparison of the XRD results. A tensile test is used to compare the mechanical properties of small samples. Next, electron backscatter diffraction analysis is performed to analyze the phase fraction, and the results are compared to those of XRD analysis. By combining different sintering durations and temperature conditions, we attempt to identify suitable spark plasma sintering conditions that yield mechanical properties comparable with previously reported values. The samples sintered at 900 and 1000oC with no holding time have a tensile strength of over 1000 MPa.

High-entropy alloys have excellent mechanical properties under extreme environments, rendering them promising candidates for next-generation structural materials. It is desirable to develop non-equiatomic high-entropy alloys that do not require many expensive or heavy elements, contrary to the requirements of typical high-entropy alloys. In this study, a non-equiatomic high-entropy alloy powder Fe49.5Mn30Co10Cr10C0.5 (at.%) is prepared by high energy ball milling and fabricated by spark plasma sintering. By combining different ball milling times and ball-topowder ratios, we attempt to find a proper mechanical alloying condition to achieve improved mechanical properties. The milled powder and sintered specimens are examined using X-ray diffraction to investigate the progress of mechanical alloying and microstructural changes. A miniature tensile specimen after sintering is used to investigate the mechanical properties. Furthermore, quantitative analysis of the microstructure is performed using electron backscatter diffraction.

근래 정신질환자의 범죄가 언론에 자주 보도되고 있다. 이들의 처벌, 치료 혹은 처우가 사회적으로 큰 이슈가 되고 있다. 그동안의 판례와 실무는 별다른 이견 없이 정신질환자의 범죄를 심신장애의 문제로 치환하여 왔다. 그래서 정신질환자에 대한 형사절차는 정신감정을 통해 행위자가 올바른 책임능력을 갖추었는지 판단하는데 집중되어 왔다. 그러나 정신질환자가 겪는 여러 증상을 바탕으로 그의 시각에서 세상을 바라본다면 다른 논리가 가능하다. 정신질환자는 비정신질환자가 바라보는 방식대로 세상을 바라보지 않는다. 즉 정신질환자는 외계에 대한 인식이 비정신질환자와 다르다. 특히 조현병이나 인식장애를 앓고 있는 사람은 범죄구성요건으로의 객관적 사실에 대한 인식을 하지 못하였다고 볼 여지가 있다. 마찬가지로 충동조절장애나 해리장애를 앓고 있는 사람은 자신의 의사와 관계없이 외적 행동이 이루어지는 경우가 많다. 그들 에게는 범죄의 의사가 없다고 볼 여지가 있다. 결국 정신질환자의 범죄행위를 논할 때는 책임능력이 아니라 주관적 구성요건의 단계에서부터 진지한 검토가 이루어져야 한다. 판례와 실무는 정신질환자의 행위에 대해 당연히 고의가 존재함을 전제로 하여, 다음 단계로 나아가는 것 같지만 이는 잘못이다. 다만 판례와 실무의 태도는 현실을 고려한 어쩔 수 없는 결론일 수 있다. 정신질환자의 고의나 과실이 부정된다면 그에게 어떠한 형벌이나 보안처분도 과할 수 없고 이는 사회보호의 측면에서 문제를 발생시키기 때문이다. 정신질환자에게 무죄판결을 선고하면서 치료감호 등의 보안처분도 할 수 없다면 법감정상 받아들이기 어려운 결과가 발생할 수 있다. 이러한 공백을 메우고 형법의 기본원칙에 충실을 기하기 위해서는 현재의 해석론만 가지고는 한계가 있고, 추가적인 입법적 개선 노력이 필요하다고 생각되는 바이다.

The purpose of this study is to prepare WO3 nanopowders by high-energy milling in mixture gas (7 % H2+Ar) with various milling times (10, 30, and 60 min). The phase transformation, particle size and light absorption properties of WO3 nanopowders during reduction via high-energy milling are studied. It is found that the particle size of the WO3 decreases from about 30 μm to 20 nm, and the grain size of WO3 decreases rapidly with increasing milling time. Furthermore, the surface of the particles due to the pulverization process is observed to change to an amorphous structure. UV/Vis spectrophotometry shows that WO3 powder with increasing milling times (10, 30, 60 min) effectively extends the light absorption properties to the visible region. WO3 powder changes from yellow to gray and can be seen as a phenomenon in which the progress of the color changes to blue. The characterization of WO3 is performed by high resolution X-ray diffractometry, Field emission scanning electron microscopy, Transmission electron microscopy, UV/Vis spectrophotometry and Particle size analysis.

태풍 내습 시 신속하고 정확한 해일고 예측은, 연안재해 대응에 필수적인 요소이다. 이러한 해일고의 예측을 위해서 기존에는 태풍예측정보를 수치모델에 적용하여 예측자료를 생산하는 것이 대부분이였다. 이러한 방법은 대용량의 컴퓨팅 자원과 시간이 소요된다는 단점이 있다. 최근에는 인공지능 기반으로 신속하게 예측자료를 생산하는 연구가 다양한 분야에서 진행되고 있으며, 본 연구에서는 인공지능 기반 해일고 예측을 수행하였다. 인공지능 적용을 위해서는 많은 수의 학습자료가 필요하게 되며, 기왕 발생태풍은 개수가 한정되어 있어 본 연구에서는 TCRM(Tropical Cyclone Risk Model)을 통하여 합성태풍을 생성하고, 이를 폭풍해일 모델에 적용하여 해일고 자료를 생성한 후, 학습자료로 활용하였다. 인공지능으로 예측한 해일고와 실제 발생 태풍에 대한 비교 결과, RMSE(Root Mean Square Error)는 0.09 ~ 0.30 m, CC(Correlation Coefficient)는 0.65 ~ 0.94, 최대 해일고의 ARE(Absolute Relative Error)는 1.0 ~ 52.5 %로 분석되었다. 특정 태풍/지점에 서는 다소 오차가 크게 나타나고 있으나, 향후 학습자료의 최적화 등을 통하여 정확도를 개선할 수 있을 것으로 기대된다.

In the membrane process, it is important to improve water treatment efficiency to ensure water quality and minimize membrane fouling. In this study, a pilot study of membrane process using reservoir water was conducted for a long time to secure high flux operation technology capable of responding to influent turbidity changes. The raw water and DAF(Dissolved Air Flotation) treated water were used for influent water of membrane to analyze the effect of water quality on the TMP (Trans Membrane Pressure) and to optimize the membrane operation. When the membrane flux were operated at 70 LMH and 80 LMH under stable water quality conditions with an inlet turbidity of 10 NTU or less, the TMP increase rates were 0.28 and 0.24 kPa/d, respectively, with minor difference. When the membrane with high flux of 80 LMH was operated for a long time under inlet turbidity of 10 NTU or more, the TMP increase rate showed the maximum of 43.5 kPa/d. However, when the CEB(Chemically Enhanced Backwash) cycle was changed from 7 to 1 day, it was confirmed that the TMP increase rate was stable to 0.23 kPa/d. As a result of applying pre-treatment process(DAF) on unstability water quality conditions, it was confirmed that the TMP rise rates differed by 0.17 and 0.64 kPa/d according to the optimization of the coagulant injection. When combined with coagulation pretreatment, it was thought that the balance with the membrane process was more important than the emphasis on efficiency of the pretreatment process. It was considered that stable TMP can be maintained by optimizing the cleaning conditions when the stable or unstable water quality even in the high flux operation on membrane process.

적외선 유도 무기 체계의 발달로 항공기의 생존성은 지속적으로 위협받고 있으며, 항공기의 생존성을 향상시키기 위한 적외선 스텔스 기술 관련 연구가 진행되고 있다. 본 논문에서는 적외선 유도 미사일이 항공기와 배경 간의 대비 신호를 탐지하는 것에 주목하여 비행 조건에 따른 항공기의 최적 적외선 신호를 분석하고자 하였다. 이를 위해 항공기의 비행 조건을 고려하여 유동 해석과 대류, 전도, 복사 3차원 열전달 해석을 수행하였고, 동체 표면 온도를 도출하여 항공기 주변 유동 특성을 기반으로 항공기의 적외선 신호를 분석하였다. 더 나아가, 비행 조건 별로 최적 적외선 신호를 갖기 위한 최적 방사율을 도출하였고, 비행 조건 별로 최적 방사율을 동체 표면에 적용했을 때 적외선 신호 저감 효과를 분석하였다.

‘古’는 문헌에 따라 특정할 수 있는 시기가 다를 수 있다는 것에 착안하여 이 연구를 시작하였다. ‘古’가 막연한 과거의 의미를 나타내는 것이 아니라 ‘古’로 한정된 특정 시기를 나타냄을 三經인《書經》과《詩經》,《周易》의 기록을 통해 파악하고 구분 정리하여 확인하였다. 三經에서 ‘古’로서 표현 된 문장이 특정한 시대를 나타내는지 아니면 막연한 옛날의 의미인지를 구분하고 문맥의 이해를 명확히 하여 역사의 해석을 더욱 확실히 할 수 있도록 하였다. 비교문헌으로《孟子》에서는 ‘古’가 夏殷周와 春秋時代를 두루 표현하면서도 특히 周 왕조와 관련된 인물들에 대하여 칭송할 때 많이 사용되었음을 알았다. 이것은《孟子》의 형성 배경과 周의 시대가 깊은 관계가 있다는 것을 설명해 주고 있다.《書經에 보이는 ‘古’는 주로 殷이 많이 언급되고 다음으로는 堯舜시대의 이야기가 많이 나온다. 이것으로 보아《書經》의 주요 형성 배경에는 堯舜夏殷 시대가 관계한다는 것을 알 수 있다. 《詩經》에서는 詩의 배경이 주로 周이다 보니, 周의 시대를 주로 말하고 있다.《周易》에는 ‘古’라는 시대적 언급이 많지 않지만 上古의 伏羲, 古의 堯舜, 中古의 周에 대해 각기 한 번씩 나오고 있다. 특정 제도나 문물의 기원 시기를 ‘古’로서 표현하는 경우가 많은데, 이때의 내용들을 모아 보면 해당 기록의 시대적 배경도 파악할 수 있다. 이렇게 ‘古’로서 표현된 시간적 시기를 특정하고 보다 세부적이고 구체적인 시대 구분을 통해 문화와 문물의 기원과 발전 과정, 제도의 기원과 발달의 시간적 영향과 선후관계를 명확하게 하면 보다 정확한 고대의 이해에 도움이 될 것이다.

Adsorption by granule activated carbon(GAC) is recognized as an efficient method for the removal of perfluorinated compounds(PFCs) in water, while the poor regeneration and exchange cycles of granule active carbon make it difficult to sustain adsorption capacity for PFCs. In this study, the behavior of PFCs in the effluent of wastewater treatment plant (S), the raw water and the effluents of drinking water treatment plants (M1 and M2) located in Nakdong river waegwan watershed was monitored. Optimal regeneration and exchange cycles was also investigated in drinking water treatment plants and lab-scale adsorption tower for stable PFCs removal. The mean effluent concentration of PFCs was 0.044 0.04 PFHxS g/L, 0.000 0.00 PFOS g/L, 0.037 0.011 PFOA g/L, for S wastewater treatment plant, 0.023 0.073 PFHxS g/L, 0.000 0.00 PFOS g/L, 0.013 0.008 PFOA g/L for M1 drinking water treatment plant and 0.023 0.073 PFHxS g/L, 0.000 0.01 PFOS g/L, 0.011 0.009 PFOA g/L for M2 drinking water treatment plant. The adsorption breakthrough behaviors of PFCs in GAC of drinking water treatment plant and lab-scale adsorption tower indicated that reactivating carbon 3 times per year suggested to achieve and maintain good removal of PFASs. Considering the results of mass balance, the adsorption amount of PFCs was improved by using GAC with high-specific surface area (2,500m2/g), so that the regeneration cycle might be increased from 4 months to 10 months even if powdered activated carbon(PAC) could be alternatives. This study provides useful insights into the removal of PFCs in drinking water treatment plant.

본 논문에서는 UiO-66 입자를 합성하고, 이를 열가소성 탄성중합체인 polystyrene-block-polybutadiene-block-polystyrene (SBS) 블록공중합체 매질에 삽입하는 방식으로 CO2/N2 기체를 분리하기 위한 혼합 매질 분리막을 제조하였다. UiO-66 가 고분자 매질에서 미치는 영향을 확인하기 위해 SBS와 UiO-66의 질량 비율을 변화시켜가며 혼합 매질 분리막을 제조하였 다. 또한 UiO-66 입자의 균일한 분산을 위해서 두 차례에 걸친 초음파 처리 및 자성 막대를 이용한 물리적 혼합을 활용하였 다. 제조된 시료들은 푸리에 변환 적외분광법(FT-IR), 주사전자현미경(SEM)을 통해 확인하였다. 또한 기체 투과 성능은 time-lag method를 통해 확인하였다. 이때, UiO-66의 함유량이 증가함에 따라 혼합 매질 분리막의 투과도는 크게 증가하였지만, CO2/N2 선택도는 크게 감소하지 않았다. 가장 좋은 성능을 보인 20%의 UiO-66 입자를 함유한 분리막의 경우 663.8 barrer의 CO2 투 과도와 13.3의 CO2/N2 선택도를 보여주었다. 이러한 결과는 Robeson plot에서 순수 고분자 막에 비해 upper bound에 더 가까 운 성능을 나타냈는데, 첨가된 UiO-66가 선택도를 크게 희생시키지 않고 기체 투과도는 두 배 이상 향상시켰기 때문이다.