heartbeat

I'm doing a final year project at university which involves making a medical application for Android, as a practice I have to make a heart rate monitor app. I have worked out that the best way to do this is to look for colour changes in your blood when holding the camera against your finger with the flash switched on. This is where the problems come into play, is it possible to take a photo every 66 milliseconds on the camera, then compare each pair of photos for any intensity changes in order to count a heart beat? or am I better off recording a video and analysing each frame looking for a

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center . My question is very simple and straight forward. Is there any technique through which i can calculate the heartbeat of a person using android device. I googled it and found some results in which they implemented it using camera. Any other idea or help will be highly appreciated. Thanks. I suppose in order to measure heartbeat you

This exact code doesn't work, but, I was hoping something like it was: io.sockets.on('connection', function(socket) { socket.on('heartbeat', function() { // Do something here... }); }); Is something like this possible? I mean, I know I can just make a different function that triggers every, say, 15 seconds using a setInterval: io.sockets.on('connection', function(socket) { setInterval(function() { // Do something },15000); }); But since the heartbeat is already running at this interval, why not make use of it? In any case, any insight would be greatly appreciated. I think that I see what you

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: My Apache Spark cluster is running an application that is giving me lots of executor timeouts: 10:23:30,761 ERROR ~ Lost executor 5 on slave2.cluster: Executor heartbeat timed out after 177005 ms 10:23:30,806 ERROR ~ Lost executor 1 on slave4.cluster: Executor heartbeat timed out after 176991 ms 10:23:30,812 ERROR ~ Lost executor 4 on slave6.cluster: Executor heartbeat timed out after 176981 ms 10:23:30,816 ERROR ~ Lost executor 6 on slave3.cluster: Executor heartbeat timed out after 176984 ms 10:23:30,820 ERROR ~ Lost executor 0 on slave5

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I've been reading many posts regarding a GCM issue that affects some people. It seems that in some devices/routers/carriers the notifications suffer delays. I've experienced this issue with my router: messages came with a lot of delay on WIFI but came instantly when I disabled WIFI and connected to the mobile net. It seems there is a workaround that can be done from the Android app. Something like increasing the heartbeat that keeps GCM connection alive, or so. Can anyone tell us what should we do to avoid the delay? How can we keep the

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm getting the following error java.lang.RuntimeException: setDataSource failed: status = 0xFFFFFFEA and I'd like to know what this status is. I'm using the function MediaMetaDataRetriever.setDataSource(String filePath) 回答1: I got this error java.lang.RuntimeException: setDataSource failed: status = 0xFFFFFFEA when tried to call void setDataSource(String path) on an empty file. (0 bytes) You need to be 100% sure that path for the file is not null, not empty, the file itself exists and valid. 回答2: It was very well buried but I found the

I want to send a heartbeat from my application to the GCM server, so the connection will stay alive. How can I do that, and how can I know the URL of my GCM server?? Thanks in advance!! How to send the heartbeat This class can sent the proper intents public class GcmKeepAlive { protected CountDownTimer timer; protected Context mContext; protected Intent gTalkHeartBeatIntent; protected Intent mcsHeartBeatIntent; public GcmKeepAlive(Context context) { mContext = context; gTalkHeartBeatIntent = new Intent( "com.google.android.intent.action.GTALK_HEARTBEAT"); mcsHeartBeatIntent = new Intent( "com

目的： 维持provider和consumer之间的长连接 实现： dubbo心跳时间heartbeat默认是60s，超过heartbeat时间没有收到消息，就发送心跳消息(provider，consumer一样),如果连着3次(heartbeatTimeout为heartbeat*3)没有收到心跳响应，provider会关闭channel，而consumer会进行重连;不论是provider还是consumer的心跳检测都是通过启动定时任务的方式实现； provider绑定和consumer连接的入口： public class HeaderExchanger implements Exchanger { public static final String NAME = "header" ; @Override public ExchangeClient connect ( URL url , ExchangeHandler handler ) throws RemotingException { return new HeaderExchangeClient ( Transporters . connect ( url , new DecodeHandler ( new HeaderExchangeHandler ( handler ))), true ); }

.netcore在k8s+docker+linux，部署后，偶尔会报这样的警告 Warn： Microsoft.AspNetCore.Server.Kestrel Heartbeat took longer than "00:00:01" at "09/06/2019 05:08:08 +00:00". 如何解决？ 来源：博客园 作者： 冰点の爱 链接：https://www.cnblogs.com/puzi0315/p/11474566.html