Utilization of wood as building materials is increasingly expected. As a further development of woodenbuildings, there is an increasing movement to make mid-rise and larger scale buildings, such as apartmenthouses and commercial buildings. In wood construction, joints play a very important role. This article outlinesvarious joining techniques for non-residential houses and their characteristics. Wood structure joints aremainly classified into three types: mortice and tenon type joint, metal fastener joint, and adhesive joint.It is possible to achieve a ductile behavior in mortice and tenon type joint by making good use of theperpendicular to grain compression property of wood. The drift pin joint is a commonly used bendingresistance type fastener due to capability of its strength estimation when it has enough arrangement interval.Further research in evaluations of splits failure and reinforcement methods have been promoted. Glued-inrod type joints and lagscrewbolt joint which shaft large diameter screws into timber hole have high rigidityand load carrying capacity. However securing of deformation capacity and control of variation in strength areissues. Self-tapping screw joints has benefit is its workability. Various applications such as shear connector byinclined screw driving and reinforcement element against embedment, shear and sprit have been proposed.In addition to above, this paper will introduce several type of joint technology, such as the large finger joint,steel plate bonding joint, and the use of adhesives as a gap filler and so on.

A review on the use of “task-specific” ionic liquids for designing of the structures of ions. Ionic liquids （ILs）entirely consist of ions. In recent years, functionalized ILs, called “task-specific” ILs （TSILs）, are finding anincreasing number of applications in synthesis, separation, catalysis, and electrochemistry.

Dextran is an α-1,6-glucan synthesized by Leuconostoc mesenteroides. In this study, dextran esterderivatives were prepared and used as novel bio-based adhesives with fine properties of harmless, fast dry,and water resistance. The solubility of dextran ester derivatives in hydrophobic or hydrophilic solvent couldbe controlled through changing the degree of substitution　（DS）. Especially, the one with DS of 1.1 is soluble inethanol, which is harmless and relatively high volatility. As adhesives, dextran ester derivatives provide goodadhesion of wood, glass, collagen films, and gladius of squid. Comparing with commercial poly　（vinyl alcohol）（PVA） and poly　（vinyl acetate）, dextran ester derivatives have shorter drying time. Furthermore, dextranester derivatives show much higher adhesive strength of PVA after immersion in water.