https://scholar.dgist.ac.kr/handle/20.500.11750/11053 2026-04-22T10:36:25Z https://scholar.dgist.ac.kr/handle/20.500.11750/60029 Title: Improvement of underwater durability and liquefaction evaluation of biopolymer-treated soil using tannic acid Author(s): Lee, J. Y.; Ryou, Jae-eun; Lee, Sangbeen; Yang, Beomjoo; Park, Chiyoung; Jung, Jongwon Abstract: Liquefaction occurs when loose, saturated sandy soils lose strength due to cyclic loads, like earthquakes, causing ground subsidence and structural collapse. While mitigation is possible, conventional cement-based methods have drawbacks, including carbon emissions and groundwater contamination. Consequently, there is a growing emphasis on the need for eco-friendly ground reinforcement materials. Research on biopolymer-treated soils lacks focus on underwater stability and performance degradation. This study used tannic acid to improve underwater durability, as confirmed through soil bonding experiments and cyclic shear tests. The optimal tannic acid formulation, based on gelatin content, enhanced liquefaction resistance and maintained stable strength during underwater curing. 2026-02-28T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/60007 Title: 물-에너지 넥서스 구현을 위한 지속가능한 수처리 기술: 계면화학적 제어와 구조적 접근 Author(s): 신명환; 이서현; 김윤아; 박치영 Abstract: 담수 부족은 여전히 심각한 세계적 문제로 남아 있으며, 이를 해결하기 위한 정밀하고 에너지 효율적인 분리 기술의 개발이 필수적이다. 본 리뷰에서는 물-에너지 넥서스(water-energy nexus, WEN) 관점에서 수처리를 위한 고효율 분리 공정의 최신 발전 동향을 다루며, 흡착, 멤브레인 여과, 멤브레인 증류의 세 가지 주요 전략을 중심으로 각 기술의 화학적 기능화 및 구조적 설계 접근을 논의한다. 흡착에서는 다공성 유기 고분자(porous organic polymers, POPs)의 높은 표면적과 다양한 기능기를 통해 미량 오염물질을 빠르고 선택적으로 제거하려는 다양한 연구가 이루어지고 있다. 멤브레인 여과에서는 거대고리 단량체 기반의 계면 중합과 계층적 기공 제어가 투과도와 선택도를 동시에 향상시키는 효과적인 전략으로 평가되고 있다. 멤브레인 증류에서는 광열 나노소재와 태양광 기반 국소 가열을 이용하는 광열 멤브레인 증류(photothermal membrane distillation, PMD)가 저온·저압에서의 안정적 운전과 높은 오염 저항성, 시스템 단순화 등의 장점으로 인해 기존 멤브레인 증류(membrane distillation, MD)의 한계를 극복한 재생 에너지 기반 오프그리드형 담수화 기술로 주목받고 있다. 본 리뷰는 이러한 화학적 설계와 구조 제어의 통합적 접근을 바탕으로, WEN 구현을 위한 지속 가능한 차세대 수처리 기술 개발의 전략적 방향을 제시한다. Freshwater scarcity remains a serious global issue, and the development of precise and energy-efficient separation technologies is essential to address this challenge. This review explores recent advances in high-efficiency separation processes for water treatment from the perspective of the water-energy nexus (WEN), focusing on three key strategies: adsorption, membrane filtration, and membrane distillation. In adsorption, various studies have been conducted to achieve rapid and selective removal of trace contaminants using porous organic polymers (POPs) with high surface areas and diverse functional groups. In membrane filtration, interfacial polymerization based on macrocyclic monomers and hierarchical pore control has been evaluated as an effective strategy for simultaneously improving permeability and selectivity. In membrane distillation, photothermal membrane distillation (PMD), which employs photothermal nanomaterials and solar-driven localized heating, is gaining attention as a next-generation desalination technology suitable for off-grid applications based on renewable energy. PMD offers advantages such as stable operation under low-temperature and low-pressure conditions, high resistance to fouling, and simplified system design, thereby overcoming the limitations of conventional membrane distillation. This review outlines strategic directions for the development of next-generation sustainable water treatment technologies through an integrated approach combining chemical design and structural control, with a focus on realizing the WEN. 2025-05-31T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/60004 Title: Engineering of Bacterial-Hybrid System via Interfacial Nanotechnology and Biological Compatibilization Strategy Author(s): Bu, Seok Hyeong; Park, Chiyoung Abstract: To overcome today's fossil fuel shortage and environmental pollution issues, research is being conducted to design a biohybrid system that utilizes bacteria which show excellent energy efficiency in nature, and this is currently considered an important task as a next-generation energy technology for future society, providing an opportunity to respond to the challenges of existing energy technologies in an environmentally sustainable manner. Since biological basic studies on functional bacterial strains that can directly contribute to the future cutting-edge industries of mankind starts to accumulate, engineers also have developed various prototype energy systems using such microorganisms. As a feasible and practical approach of microbial-hybrid systems, whole-cell-based hybrid systems, which innovatively combine artificial materials with the biological cells are attractive interdisciplinary research that can meet the requirements of modern energy society. Herein, we will explain the working mechanism and principle of various kinds of modern bacterial-hybrid technology through biological characteristics of the bacteria in the primitive natural environment. In addition, inspired from the biological mechanisms of wildlife bacterial logic, we will further demonstrate the feasible bio-inspired artificial systems, which can be utilized for various applications including energy harvesting and storage, environmental remediations. 2025-11-30T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/60003 Title: Integrating Biohybrid Systems into the Water-Energy-Food Nexus for Sustainable Future Author(s): Bu, Seok Hyeong; Jeong, Yunseop; Cho, Hanhee; Park, Chiyoung Abstract: The Water-Energy-Food (WEF) nexus is a conceptual framework that recognizes the deep interdependencies among three essential resources, specifically water, energy, and food. It seeks to achieve environmental sustainability, resource security, and industrial efficiency through integrated engineering. In this context, biohybrid systems that merge biological components with artificial or engineered materials offer promising and practical pathways to foster interconnectivity within the WEF nexus. These systems can enhance performance by harnessing the unique capabilities of living organisms, such as self-repair, metabolic conversion, and environmental adaptability, while combining them with the structural and functional advantages of synthetic materials. Here, an integrated approach is presented that incorporates biohybrids into conventional WEF nexus technologies to establish long-term sustainability. In particular, the introduction of biohybrid system enables ecologically friendly, low-cost, and energy-efficient solutions. These strategies address current global challenges in water, energy, and food while also holding potential for applications in future-oriented technologies such as space exploration and planetary colonization. Overall, biohybrid WEF nexus systems represent a versatile and scalable platform for advancing sustainability in both terrestrial and extraterrestrial environments. 2025-10-31T15:00:00Z