Abstract: A part of data is extracted as an IV from cipher text at the previous time. An EX-OR gate ORes the IV and a common key and outputs a cipher key. Data to be transmitted are encrypted with the cipher key according to stream cipher. When ciphered data 15a are obtained at time tn?1, an IV extracted from the ciphered data 15a is supplied to an EX-OR gate 11b. The EX-OR gate 11b exclusively ORes the IV and a common key 12b and outputs a cipher key 13b. Since the cipher key 13b and transmission data are exclusively ORed, encryption is performed according to the stream cipher. As a result, ciphered data 15b at time tn is obtained. Next, with the IV extracted from the ciphered data 15b, encryption at time tn+1 is performed. Thereafter, at each time, a part of cipher text is used as an IV. The encrypting process is repeated.

Abstract: A chaos spreading code c(n) is inputted to a spreading unit 32. Data D1 and c(n) are multiplied in the spreading unit 32. A chaos spreading code d(n) is inputted to a spreading unit 42. Data D2 and d(n) are multiplied in the spreading unit 42. The chaos spreading codes c(n) and d(n) orthogonally cross each other. Outputs of the spreading units 32 and 42 are added by an adder 35 and transmitted through a transmitting unit 36 to a transmission path 38. By making an initial value which is set in a chaos sequence generator having a construction of a digital circuit different, the chaos spreading codes which orthogonally cross can be formed. Since the chaos spreading codes c(n) and d(n) orthogonally cross, an orthogonal modulating unit having a construction of an analog circuit for amplitude-modulating carriers which orthogonally cross can be made unnecessary and the construction can be simplified.

Abstract: Random number generating, encrypting, and decrypting apparatus, method thereof, program thereof, and recording medium thereof are provided. Random numbers for cryptographic applications are generated by a CA core. The CA core is composed of one-dimensional, two-state, and three-neighbor cell automaton. A total of three inputs for the own cell and both neighbor cells are input to each cell. Each cell performs a logical operation and outputs the result of the logical operation. Each cell contains a register. Each register captures the result of the logical operation in synchronization with a clock and stores the result. An output of a cell is fed back to the cell to perform an arithmetic calculation at the next time step. In this case, a rotation shift operation of which outputs of cells are shifted to the left and fed back to the cells is performed. To output random numbers having many bits, 40 bits of outputs of cells are selected.

Abstract: A wiring connecting box is supported by a link bar coupling a front railway vehicle and a rear railway vehicle. Receptacles connected to end portion connectors of wiring cables of the front vehicle and the rear vehicle are respectively arranged on the front face and the rear face of the wiring connecting box. A connecting cable for connecting the receptacle on the front face and the receptacle on the rear face is arranged within the wiring connecting box. The wiring cables of the front vehicle and the rear vehicle are connected to each other through the connecting cable. Smooth wiring can be performed between the vehicles by using the wiring connecting box.

Abstract: A wiring connecting box is supported by a link bar coupling a front railway vehicle and a rear railway vehicle. Receptacles connected to end portion connectors of wiring cables of the front vehicle and the rear vehicle are respectively arranged on the front face and the rear face of the wiring connecting box. A connecting cable for connecting the receptacle on the front face and the receptacle on the rear face is arranged within the wiring connecting box. The wiring cables of the front vehicle and the rear vehicle are connected to each other through the connecting cable. Smooth wiring can be performed between the vehicles by using the wiring connecting box.

Abstract: A method and medium for the multiplication of normal diploid cells from mammals is described, comprising cultivating the cells in a culture medium containing an amine derivative or derivatives represented by the general formula: NR.sup.1 R.sup.2 R.sup.3 (wherein R.sup.1, R.sup.2 and R.sup.3 represents a straight, branched or cyclic alkyl group or a hydrogen atom, provided that R.sup.1, R.sup.2 and R.sup.3 are not hydrogen atoms at the same time. Addition of these specific amine derivatives permits multiplication of normal diploid cells in a culture medium containing a limited concentration of serum. These amine derivatives are inexpensive and can be stored for a long period of time, and their storage and handling are easy. The use of these amine derivatives overcomes various problems encountered in using serum in the multiplication of normal diploid cells according to conventional methods.

Abstract: An aqueous solution of a tissue plasminogen activator dissolved therein at an increased concentration which comprises an aqueous medium and, dissolved therein, a high purity tissue plasminogen activator and at least one dissolution aid selected from the group consisting of lysine, ornithine and salts thereof, and a method for increasing a solubility of a high purity tissue plasminogen activator in an aqueous medium comprising adding said at least one dissolution aid to an aqueous solution of a high purity tissue plasminogen activator. The present aqueous solution contains a high purity tissue plasminogen activator dissolved therein at an increased concentration and the activity of the tissue plasminogen activator can be maintained during handling and storage of the aqueous solution.

Abstract: An automatic recording bias current setting apparatus comprises a bias current generating circuit for generating a bias current with varied level of the bias current, a testing signal generating circuit for generating two kinds of testing signals having different mid and high frequencies of an audio signal, by independently varying the levels of the testing signals, a recording and reproducing circuit for recording the two kinds of testing signals with the bias current onto a magnetic recording medium and reproducing the same, and a bias current detecting circuit for detecting the level of a bias current. The recording and reproducing circuit repeats an operation in which the two kinds of testing signals are recorded onto the magnetic recording medium and then reproduced with independently varied levels of the two kinds of testing signals under the same bias current obtained from the bias current generating circuit, for each of the different varied bias currents.

Abstract: A process for the preparation of a plasminogen activator is described, which comprises bringing normal diploid cells derived from human bodies capable of producing the plasminogen activator into contact with a solution containing an enzymatically-decomposed animal meat peptone, the plasminogen activator having the following properties:(a) molecular weight: 63,000.+-.10,000;(b) isoelectric point: 7.0 to 8.5;(c) affinity to fibrin: present;(d) affinity to Concanavalin A: present;(e) optimum pH: 7 to 9.5; and(f) no reactivity with anti-urokinase specific antibody.The plasminogen activator can be obtained in a high yield.

Abstract: A plasminogen activator obtained from a tissue cultured liquor of human normal tissue derived cells, e.g., human embryonic derived cells, human placenta derived cells etc., and having the following properties:(a) molecular weight measured by gel filtration: 63,000.+-.10,000,(b) isoelectric point: 7.0-8.5,(c) affinity to fibrin: present,(d) affinity to concanavalin A: present,(e) optimum pH: 7-9.5, and(f) stability: does not lose activity at 60.degree. C. for 10 hours but loses about 5% of activity at pH 2-3 at 98.degree. C. for a minute; a process for the production of the aforesaid plasminogen activator; and a thrombolytic composition containing the aforesaid plasminogen activator as an active ingredient are disclosed.

Abstract: In the production of plasminogen activator from animal cells in a nutrient solution, the addition of a large amount of fumaric acid, malic acid, succinic acid, and/or glycolic acid to the nutrient solution brings about a 30 to 180% increase in the amount of plasminogen activator produced.

Abstract: A plasminogen activator having a molecular weight of 45,000 to 68,000 is formed as a single fraction in the cells of human kidney or lung, and is separated and recovered with good efficiency without reducing its molecular weight. The pH of a solution to be contacted with said cells and the concentration of dissolved oxygen should be maintained within suitable ranges in order to form the plasminogen activator having a molecular weight of 45,000 to 68,000 as a single fraction. Furthermore, by properly adjusting the residence time of the solution with the cells, the activator can be formed over a long period of more than 40 days. To separate the activator, the pH of the solution in the separating step is maintained preferably at 4 to 12. By causing a metal chelating agent to be present in the solution in the separating step, the plasminogen activator can be obtained without reducing its molecular weight.