We consider packing LP’s with m rows where all constraint coefficients are normalized to be in the unit interval. The n columns arrive in random order and the goal is to set the corresponding decision variables irrevocably when they arrive to obtain a feasible solution maximizing the expected reward. Previous (1 − )-competitive algorithms require the right-hand side of the LP to be Ω( 2 log n )...

Zijincheng, also known as the Forbidden City, is largest and best-preserved ancient palace-type wooden building in China, built without using a single nail. Since it was 1420, has served palace where emperor lives works. Almost 600 years old, gone through two dynasties (i.e., Ming Qing (AD 1368–AD 1912)) 24 emperors. It survived more than 200 devastating earthquakes throughout its history, stil...

Metal baseball bats have been experimentally demonstrated to produce higher ball exit velocity (BEV) than wooden bats. In the United States, all bats are subject to BEV tests using hitting machines that rotate the bat in a horizontal plane. In this paper, a model of bat-ball impact was developed based on 3-D translational and rotational kinematics of a swing performed by high-level players. The...

Application of wood in rural construction is diffused all around the world since remote times. However, its inclusion in structural design deserves strong support from broad knowledge of material properties. The pertinent literature reveals the application of optical methods in determining the complete field displacement on bodies exhibiting regular as well as irregular surfaces. The use of moi...

The paper presents the test results of beams made of chipboards, fibreboards, wood as per referenced items [1], [2], [3]. Adopting various rheological models, their behaviour in time under permanent load was described. The model testing of a box-section beam, with wooden flanges connected with continuous chipboard lacings, was described. It was found that the construction of beams made of unlim...

The previous are identical to the expressions (2) and (3). Thus the n 1 columns do consist of two repetitions of 2”-r-level Gray code. Now if we combine the first two columns again, we reduce each 2”-‘-level Gray code into two 2n-2-level Gray codes, or, the complete array into four 2”-2-level Gray codes. This can continue until we have only m columns, which would be 2n-m repetitions of 2”‘-leve...

The previous are identical to the expressions (2) and (3). Thus the n 1 columns do consist of two repetitions of 2”-r-level Gray code. Now if we combine the first two columns again, we reduce each 2”-‘-level Gray code into two 2n-2-level Gray codes, or, the complete array into four 2”-2-level Gray codes. This can continue until we have only m columns, which would be 2n-m repetitions of 2”‘-leve...

A disentanglement puzzle consists of mechanically interlinked pieces, and the puzzle is solved by disentangling one piece from another set of pieces. A string puzzle is a type of disentanglement puzzle, which consists of strings entangled with one or more wooden pieces. In this paper, we consider the generalized string puzzle problem whose input is the layout of strings and a wooden board with ...

Abstract—The structural system of wooden house by two-by-four method is widely adopted in any countries, and a various type of vibration control system for building structures has been developed on country with frequent earthquake. In this study, a vibration control device called “Scaling Frame” (SF) is suggested, and which is applied to wooden two-by-four method structures. This paper performs...