Abstract: Provided is a compound of Chemical Formula 1 or 2: wherein: R1 to R4 are each independently hydrogen or deuterium; n1 to n4 are an integer of 1 to 4; L1 and L2 are each independently a direct bond or a substituted or unsubstituted C6-60 arylene; and Ar1 and Ar2 are each independently a substituent of Chemical Formula 3: wherein X1 to X5 are each independently N or C(R5), wherein at least two of X1 to X5 are N; and each R5 is independently hydrogen, deuterium, a substituted or unsubstituted C1-20 alkyl, a substituted or unsubstituted C6-60 aryl, or a substituted or unsubstituted C2-60 heteroaryl containing at least one of N, O and S, or two adjacent R5s combine to form a benzene ring; and an organic light emitting device including the same. The device exhibits significantly superior efficiency and lifespan.

Abstract: A battery pack includes, a module stack in which a plurality of battery modules are stacked; a pack housing having a lower housing for supporting the module stack at a lower side thereof and an upper housing coupled to the lower housing from an upper side of the module stack; a plurality of weld nuts fixed to a lower surface of the lower housing; and a plurality of fastening bolts fastened to the weld nuts through the pack housing and the module stack.

Abstract: A stent having a multi-layered coating adhered to its surface which can prevent restenosis and thrombosis at the implant site. The stent coating is comprised of two layers. The first layer is a polymeric coating with one or more biologically active agent(s) dispersed therein. The second layer is comprised of a hydrophobic heparinized polymer that inhibits blood coagulation and provides a hydrophilic surface for reducing the friction between stent and lesion site. In preferred embodiments of the invention, the multi-layered stent is effective in deterring restenosis and thrombosis at the implant site. In these same preferred embodiments, the multi-layered stent is capable of reducing the burst release of the biologically active agents from the first layer and sustaining a release of an effective amount of these agents for a relatively extended period of time. Methods of applying the multi-layered coating to the stent surface are also part of this invention.

Abstract: The object of this invention is to provide a metal stent used for insertion into a coronary artery to treat a patient suffering from angina pectoris or myocardial infarction due to a coronary artery disease. This stent consists of a plurality of primary stent units (1), each having a zigzag shape rounded at its bent portions and being expandable in a circumferential direction. The primary stent units (1) are assembled into a single cylindrical structure of the stent such that each two primary stent units (1) are integrated into one secondary stent unit by a first strut (2?) or (2?) connecting each projected bent portion of each of the two primary stent units (1) to an associated bent portion of the other. Each two secondary stent units are integrated into a desired stent by a plurality of hook-shaped second struts (3) connecting the projected bent portions of the two secondary stent units to each other.

Abstract: A stent having a multi-layered coating adhered to its surface which can prevent restenosis and thrombosis at the implant site. The stent coating is comprised of two layers. The first layer is a polymeric coating with one or more biologically active agent(s) dispersed therein. The second layer is comprised of a hydrophobic heparinized polymer that inhibits blood coagulation and provides a hydrophilic surface for reducing the friction between stent and lesion site. In preferred embodiments of the invention, the multi-layered stent is effective in deterring restenosis and thrombosis at the implant site. In these same preferred embodiments, the multi-layered stent is capable of reducing the burst release of the biologically active agents from the first layer and sustaining a release of an effective amount of these agents for a relatively extended period of time. Methods of applying the multi-layered coating to the stent surface are also part of this invention.

Abstract: A stent having a multi-layered coating adhered to its surface which can prevent restenosis and thrombosis at the implant site. The stent coating is comprised of two layers. The first layer is a polymeric coating with one or more biologically active agent(s) dispersed therein. The second layer is comprised of a hydrophobic heparinized polymer that inhibits blood coagulation and provides a hydrophilic surface for reducing the friction between stent and lesion site. In preferred embodiments of the invention, the multi-layered stent is effective in deterring restenosis and thrombosis at the implant site. In these same preferred embodiments, the multi-layered stent is capable of reducing the burst release of the biologically active agents from the first layer and sustaining a release of an effective amount of these agents for a relatively extended period of time. Methods of applying the multi-layered coating to the stent surface are also part of this invention.

Abstract: The object of this invention is to provide a metal stent used for insertion into a coronary artery to treat a patient suffering from angina pectoris or myocardial infarction due to a coronary artery disease. This stent consists of a plurality of primary stent units (1), each having a zigzag shape rounded at its bent portions and being expandable in a circumferential direction. The primary stent units (1) are assembled into a single cylindrical structure of the stent such that each two primary stent units (1) are integrated into one secondary stent unit by a first strut (2′) or (2″) connecting each projected bent portion of each of the two primary stent units (1) to an associated bent portion of the other. Each two secondary stent units are integrated into a desired stent by a plurality of hook-shaped second struts (3) connecting the projected bent portions of the two secondary stent units to each other.