Selasa, 06 Juni 2017

Energy Efficiency and Loss of Transmission Data on Wireless Sensor Network with Obstacle


Abdi Wahab*, Fandi Ali Mustika*, Rizal Broer Bahaweres+, Deny Setiawan*, Mudrik Alaydrus*


The growth of Wireless Sensor Network (WSN) in the late years, encourages a lot of research in it. The most investigated topics are energy consumption, coverage, and connectivity in WSN. This paper discusses connectivity for WSN with the presence of simple obstacles. The LEACH protocol is used and is modified based on the obstacle, to improve the clustering process. We propose an algorithm based on the intersection of line to improve the original LEACH. The result of simulation shown the modified LEACH algorithm works better than the original LEACH with the presence of obstacle based on energy consumption and loss of transmission data. The future work could be done to modify the LEACH for arbitrary obstacle.
Keywords—LEACH; Obstacle; WSN

Sabtu, 11 Oktober 2014

Perbandingan QoS VoIP pada Jaringan Ad hoc dengan Protokol AODV dan AOMDV


Abdi Wahab1, Mudrik Alaydrus2

1,2 Magister Teknik Elektro, Program Paska Sarjana, Universitas Mercu Buana

nangdul56@gmail.com, mudrikalaydrus@yahoo.com

 

Abstract — The Cheap of VoIP technology, it simplify to used to build a media communication when the emergency held. VoIP can run on less infrastructure network, which is ad hoc network. In this research will try to calculate QoS on VoIP running on ad hoc network and uses AODV and AOMDV routing protocol. Two simulation will be build with NS-2, and the all the VoIP simulation will be used on hop scenario. The result obtain from the simulation shows that from chosen of the three QoS parameters, there’s only a few differences in delay, meanwhile for the two QoS parameters there is no big differences, even tend to be a same value. It’s more better to to make simulation with multi hop for the next research.

Keyword — VoIP, ad hoc network, AODV, AOMDV

 

Abstrak — Teknologi VoIP yang murah, memudahkan untuk digunakan ketika diperlukan media komunikasi dalam keadaan darurat. VoIP bisa berjalan di jaringan less infrastructure, salah satunya jaringan ad hoc. Pada penilitian ini akan coba dihitung QoS pada jaringan VoIP yang berjalan pada ad hoc dan menggunakan protokol routing AODV, dan AOMDV. Dua buah simulasi akan dibuat menggunakan NS-2 dan seluruh simulasi VoIP akan dibuat untuk skenario 1 hop saja. Hasil yang didapatkan dari simulasi menunjukkan bahwa dari ketiga parameter QoS yang diambil, hanya terjadi sedikit perbedaan delay, sedangkan dua parameter yang lain tidak terjadi perbedaan besar, bahkan cenderung memiliki nilai yang sama. Akan lebih baik lagi jika dibuat simulasi dengan multi hop untuk penelitian selanjutnya.

Kata kunci — VoIP, jaringan ad hoc, AODV, AOMDV

 

Senin, 23 Desember 2013

Developing VMS (Vessel Monitoring System) For IMACS in Lombok

A few weeks a go, exactly on December 10 until December 12, I went to Lombok to testing VMS application I've developed. One of my task is testing and trying the VMS apps for real testing on board or vessel. This project is from IMACS USAID, because they want give this application to DKP Lombok for monitoring vessel under 30 GT. Because there's no regulation for monitoring vessel under 30 GT. 
It was very interesting experience, because that the first time I land my feet on NTB, and the first time testing real GPS devices on vessel board. May be I'll tell a lot about application in the next post. And here is the boat I used to try the apps and GPS.
Hee... May be in January, I'll go back to Lombok to present elogbook apps.

Minggu, 14 April 2013

Car Rental Application with SMS Gateway

Ok, in this post I'll show my project with my friend, Hendri, for building a car rental
application with sms gateway integrated. In this application, user can reserve a car via sms, but the user must be registered first at office.
This is the screen shoot of application.
 

That's the first screen of application. I'll complete it later. If you interest with this app, don't hesitate to contact me.

Senin, 05 November 2012

Simple Temperature Conversion Apps for Android (Aplikasi Konversi Suhu Sederhana untuk Android)

Ok, in this post, I'll post a simple apps for conversion of temperature. This apps for only Android phone. And this is the capture of the application.
In this apps, I use spinner to add dropdown box like in a website. Ok, to make this app, so these are the codes you need to write.

First of all is main activity layout, I named it activity_conversion.xml. It's look like this:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="20dp"
        android:layout_marginTop="14dp"
        android:text="@string/hello_world"
        tools:context=".ConversionActivity" />

    <Spinner
        android:id="@+id/spinner1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView1"
        android:layout_below="@+id/textView1"
        android:layout_marginTop="16dp" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/spinner1"
        android:layout_below="@+id/spinner1"
        android:layout_marginTop="20dp"
        android:text="@string/hello2" />

    <Spinner
        android:id="@+id/spinner2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView2"
        android:layout_below="@+id/textView2"
        android:layout_marginTop="22dp" />

    <TextView
        android:id="@+id/textView3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/spinner2"
        android:layout_below="@+id/spinner2"
        android:layout_marginTop="14dp"
        android:text="@string/insert_temp" />

    <EditText
        android:id="@+id/insert_editText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView3"
        android:layout_below="@+id/textView3"
        android:layout_marginTop="20dp"
        android:ems="10" />

    <Button
        android:id="@+id/convert_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/insert_editText"
        android:layout_below="@+id/insert_editText"
        android:text="@string/convert_button" />

    <EditText
        android:id="@+id/result_editText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/convert_button"
        android:layout_alignParentBottom="true"
        android:layout_marginBottom="20dp"
        android:ems="10" >

        <requestFocus />
    </EditText>

    <TextView
        android:id="@+id/textView4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/result_editText"
        android:layout_alignLeft="@+id/result_editText"
        android:layout_marginBottom="22dp"
        android:text="@string/result" />

</RelativeLayout>

And for the second is strings.xml. Here it's the code for strings.xml:
<resources>

    <string name="app_name">TempConversion</string>
    <string name="hello_world">Choose your temperature from</string>
    <string name="menu_settings">Settings</string>
    <string name="title_activity_conversion">ConversionActivity</string>
    <string name="hello2">Conversion to</string>
    <string name="insert_temp">Insert your temperature</string>
    <string name="result">The result is</string>
    <string name="convert_button">Convert</string>
    <string-array name="nama_suhu">
        <item>Celcius</item>
        <item>Fahrenheit</item>
        <item>Kelvin</item>
        <item>Reamur</item>
    </string-array>
    <string-array name="nama_suhu2">
        <item>Celcius</item>
        <item>Fahrenheit</item>
        <item>Kelvin</item>
        <item>Reamur</item>
    </string-array>

</resources>

Next is the main activity, I named it with ConversionActivity.java. And the codes are:
package org.tempconversion;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;

public class ConversionActivity extends Activity implements OnItemSelectedListener{

    //private String suhu1, suhu2;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_conversion);
       
        final Spinner pilTemp1 = (Spinner)findViewById(R.id.spinner1);
        ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.nama_suhu, android.R.layout.simple_spinner_item);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        pilTemp1.setAdapter(adapter);
        final Spinner pilTemp2 = (Spinner)findViewById(R.id.spinner2);
        ArrayAdapter<CharSequence> adapter2 = ArrayAdapter.createFromResource(this, R.array.nama_suhu2, android.R.layout.simple_spinner_item);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        pilTemp2.setAdapter(adapter2);
        final EditText inputTemp = (EditText)findViewById(R.id.insert_editText);
        final EditText resultTemp = (EditText)findViewById(R.id.result_editText);
        final Button convertButton = (Button)findViewById(R.id.convert_button);
       
        // event for button
        convertButton.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                String suhu1 = pilTemp1.getSelectedItem().toString();
                String suhu2 = pilTemp2.getSelectedItem().toString();
                String strSuhu = inputTemp.getText().toString();
                String strSuhuAkhir = "";
                double suhuAwal = Double.parseDouble(strSuhu);
                double suhuResult = 0;
                // selection for converting suhu
                // start with Celcius first
                if(suhu1.equals("Celcius")) {
                    if(suhu2.equals("Fahrenheit")) {
                        suhuResult = (suhuAwal * 9 / 5) + 32;
                    } else if(suhu2.equals("Kelvin")) {
                        suhuResult = suhuAwal + 273;
                    } else if(suhu2.equals("Reamur")) {
                        suhuResult = suhuAwal * 4 / 5;
                    } else {
                        suhuResult = suhuAwal;
                    }
                } else if(suhu1.equals("Fahrenheit")) {
                    if(suhu2.equals("Celcius")) {
                        suhuResult = (suhuAwal - 32) * 5 / 9;
                    } else if(suhu2.equals("Kelvin")) {
                        suhuResult = (suhuAwal - 459) * 5 / 9;
                    } else if(suhu2.equals("Reamur")) {
                        suhuResult = (suhuAwal - 32) * 4 / 9;
                    } else {
                        suhuResult = suhuAwal;
                    }
                } else if(suhu1.equals("Kelvin")) {
                    if(suhu2.equals("Celcius")) {
                        suhuResult = suhuAwal - 273;
                    } else if(suhu2.equals("Fahrenheit")) {
                        suhuResult = suhuAwal * 9 / 5 - 459;
                    } else if(suhu2.equals("Reamur")) {
                        suhuResult = (suhuAwal - 273) * 4 / 5;
                    } else {
                        suhuResult = suhuAwal;
                    }
                } else if(suhu1.equals("Reamur")) {
                    if(suhu2.equals("Celcius")) {
                        suhuResult = suhuAwal * 5 / 4;
                    } else if(suhu2.equals("Kelvin")) {
                        suhuResult = suhuAwal * 5 / 4 + 273;
                    } else if(suhu2.equals("Fahrenheit")) {
                        suhuResult = suhuAwal * 9 / 4 + 32;
                    } else {
                        suhuResult = suhuAwal;
                    }
                }
                strSuhuAkhir = Double.toString(suhuResult);
                resultTemp.setText(strSuhuAkhir);
            }
        });
    }

    public void onItemSelected(AdapterView<?> parent, View view,
            int pos, long id) {
        // An item was selected. You can retrieve the selected item using
        // parent.getItemAtPosition(pos)
    }
   
    public void onNothingSelected(AdapterView<?> parent) {
        // Another interface callback
    }
   
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_conversion, menu);
        return true;
    }
}


Ok, that's all for sharing today. Happy coding and go open source.

Rabu, 17 Oktober 2012

Simple Encryption Aplications Using AES and MD5 ( Aplikasi Enkripsi Sederhana Menggunakan AES dan MD5 )

Ok, this time I'll share about simple apps for encryption using AES and MD5. I try to combine AES with MD5. The string will be encrypted with AES first, and then the cipher text will be encrypted again with MD5. So, this is the capture of the applications.
The first field is for key encryption, and the second field is for the teks to be encrypted.
To create this app, I use 3 classes. The first class is an activity called AesMd5.java, GenerateAes.java, Md5Baru.java.
For the source code  to create this simple apps I'll show below.
The first is
AesMd5.java

package org.aesmd5;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.*;
import android.widget.Button;
import android.widget.EditText;

public class AesMd5 extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_aes_md5);
       
        final Button enkripButton = (Button)findViewById(R.id.enkrip_button);
        final EditText inputKunci = (EditText)findViewById(R.id.input_kunci);
        final EditText inputKata = (EditText)findViewById(R.id.input_kata);
        final EditText teksEnkrip = (EditText)findViewById(R.id.teks_enkrip);
        // handling for Encryption
        enkripButton.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                String ambilKunci = inputKunci.getText().toString();
                String ambilKata = inputKata.getText().toString();
                String enKata = "";
                try {
                    enKata = GenerateAES.encrypt(ambilKunci, ambilKata);
                } catch (Exception e) {
                    e.printStackTrace();
                }
                //teksEnkrip.setText(enKata);
                teksEnkrip.setText(Md5Baru.MD5(enKata));
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_aes_md5, menu);
        return true;
    }
}


GenerateAes.java

package org.aesmd5;

import javax.crypto.*;
import javax.crypto.spec.*;
import java.security.SecureRandom;

public class GenerateAES {
    //private Cipher cipher;
    //private SecretKeySpec sKey;
    public GenerateAES() {
    }
   
    public static String encrypt(String seed, String cleartext) throws Exception {
        byte[] rawKey = getRawKey(seed.getBytes());
        byte[] result = encrypt(rawKey, cleartext.getBytes());
        return toHex(result);
}

public static String decrypt(String seed, String encrypted) throws Exception {
        byte[] rawKey = getRawKey(seed.getBytes());
        byte[] enc = toByte(encrypted);
        byte[] result = decrypt(rawKey, enc);
        return new String(result);
}

private static byte[] getRawKey(byte[] seed) throws Exception {
        KeyGenerator kgen = KeyGenerator.getInstance("AES");
        SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");
        sr.setSeed(seed);
    kgen.init(128, sr); // 192 and 256 bits may not be available
    SecretKey skey = kgen.generateKey();
    byte[] raw = skey.getEncoded();
    return raw;
}


private static byte[] encrypt(byte[] raw, byte[] clear) throws Exception {
    SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
        Cipher cipher = Cipher.getInstance("AES");
    cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
    byte[] encrypted = cipher.doFinal(clear);
        return encrypted;
}

private static byte[] decrypt(byte[] raw, byte[] encrypted) throws Exception {
    SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
        Cipher cipher = Cipher.getInstance("AES");
    cipher.init(Cipher.DECRYPT_MODE, skeySpec);
    byte[] decrypted = cipher.doFinal(encrypted);
        return decrypted;
}

public static String toHex(String txt) {
        return toHex(txt.getBytes());
}

public static byte[] toByte(String hexString) {
        int len = hexString.length()/2;
        byte[] result = new byte[len];
        for (int i = 0; i < len; i++)
                result[i] = Integer.valueOf(hexString.substring(2*i, 2*i+2), 16).byteValue();
        return result;
}

public static String toHex(byte[] buf) {
        if (buf == null)
                return "";
        StringBuffer result = new StringBuffer(2*buf.length);
        for (int i = 0; i < buf.length; i++) {
                appendHex(result, buf[i]);
        }
        return result.toString();
}
private final static String HEX = "0123456789ABCDEF";
private static void appendHex(StringBuffer sb, byte b) {
        sb.append(HEX.charAt((b>>4)&0x0f)).append(HEX.charAt(b&0x0f));
}
}


Md5Baru.java

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

package org.aesmd5;
import java.security.*;
/**
 *
 * @author nang
 */
public class Md5Baru {

    public static String MD5(String text) {
        String md5 = "";
        byte test[] = text.getBytes();
        int panjang = 16;
        byte[] mesDig = new byte[panjang];
        try {
        MessageDigest mD = MessageDigest.getInstance("MD5");
        mD.reset();
        mD.update(text.getBytes(), 0, text.length());
        mD.digest(mesDig, 0, panjang);
        StringBuffer sB = new StringBuffer();
        for(int i=0; i<mesDig.length;i++) {
            //mesDig = mD.digest(test, 0, test.length);
            String hex = Integer.toHexString(0xFF & mesDig[i]);
            if(hex.length() == 1) {
                sB.append('0');
            }
            sB.append(hex);
        }
        md5 = sB.toString();
        } catch (Exception e){

        }
        return md5;
    }
}

And the last is activity_aes_md5.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    <TextView
        android:id="@+id/teks_kunci"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Masukkan kunci"
        />
    <EditText
        android:id="@+id/input_kunci"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        />
    <TextView
        android:id="@+id/teks_kata"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Masukkan kata"
        />
    <EditText
        android:id="@+id/input_kata"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        />
    <Button
        android:id="@+id/enkrip_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Enkrip"
        />
    <EditText
        android:id="@+id/teks_enkrip"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        />
</LinearLayout>

Ok, that's all for today, happy coding, and go Open Source.

Selasa, 02 Oktober 2012

Using pointer to initialize Array 2D ( Menggunakan Pointer untuk menginisialisasi Array 2D)

Ok, in this post, I would like to share about pointer in c. Even this pointer an old stuff, but, if you are interest in kernel and embedded system, it always use. Go to the topics, I'll share a little c code to initialize a 2D array with a pointer. The pointer will be a parameter in a function. This is the code:

#include <stdio.h>

void main(){
 int a[2][2];
 int b[2][2];
 int i,j;
 initArray(a,2,2);
 //display(a,2,2);
 //show(b,2,2);
 //show(a,2,2);
 for(i=0;i<2;i++) {
     for(j=0;j<2;j++) {
         printf("a[%d][%d]: %d ",i,j,a[i][j]);
     }
     printf("\n");
 }
}

void initArray(int *k, int r, int c) {
    int i,j,*z;
    for(i=0;i<r;i++) {
        z = k+i*r;
        for(j=0;j<c;j++) {
            printf("arr[%d][%d]: ",i,j);
            scanf("%d", &(*(z+j)));
        }
    }
}
display(int *k,int r,int c){
int i,j,*z;
printf("Display\n");
 for(i=0;i<r;i++){
   z=k+i*r;
   printf("%p \n",z);
      for(j=0;j<c;j++){
          printf("%d, %p\n",*(z+j), &(*(z+j)));
       }
  }
}

show(int *q,int ro,int co){
int i,j;
printf("Show");
   for(i=0;i<ro;i++){
     printf("\n");
     for(j=0;j<co;j++){
      printf("%d",*(q+i*co+j));
      }
   }
}

And this is the capture of the running program.






Go Open Source... and Happy Coding.