This invention provides an optical module, in which a wiring inductance between a laser diode and a circuit for driving the laser diode may be reduced, thereby enhancing a high frequency performance. When it is determined that a driver is drowsy, for example, the response system may modify the operation of one or more vehicle systems. The central controller records a failure alert received from the second node in a log. Expired objects are collected in a list, and may be periodically ejected from the cache, or when the cache is nearly full. These techniques obviate storage andor transfer of such sensitive data, even with respect to payment transactions that are being authorized or otherwise enabled from CDN edge servers. A method of preventing infectious diseases wherein cystine and the like and theanine are administered in combination, a method of enhancing an infectious disease-preventive action of cystine and the like, which contains administering cystine and the like and theanine in combination, a pharmaceutical composition, food and feed wherein cystine and the like and theanine are combined.