Thursday, August 28, 2025

Two Papers Accepted at APSIPA 2025 in Singapore

I’m thrilled to share that two of my papers have been accepted for presentation at the APSIPA Annual Summit and Conference 2025, taking place in vibrant Singapore this October. This marks a significant milestone for our research team and underscores our ongoing commitment to advancing speech and audio processing, particularly for health applications.

Accepted Papers

Paper ID Title
120 Dementia Prediction From Speech Signal Using Optimized Prosodic Features
241 Comparison of Solicited and Longitudinal Cough Sounds for Tuberculosis Detection


Paper Summaries

Dementia Prediction From Speech Signal Using Optimized Prosodic Features

This study explores how subtle changes in speech prosody—such as pitch, rhythm, and intensity—can serve as early indicators of dementia. By optimizing feature selection and leveraging machine learning classifiers, our approach achieved a classification accuracy that outperforms several baseline models. We believe this work could pave the way for noninvasive, cost-effective screening tools.

Comparison of Solicited and Longitudinal Cough Sounds for Tuberculosis Detection

In this paper, we examine the diagnostic power of cough sound recordings collected under controlled (“solicited”) versus naturalistic (“longitudinal”) conditions. Our analysis demonstrates that longitudinal data, captured through everyday smartphone use, retains enough acoustic signatures to reliably flag tuberculosis. The findings suggest a path toward scalable, remote health monitoring in resource-limited settings.


Acknowledgements

  • My co-authors and lab mates for their relentless dedication to data collection and algorithm development
  • Funding agencies and institutional support that made this research possible
  • All participants who shared their speech and cough recordings, enabling us to push the boundaries of health diagnostics


Next Steps

  1. Prepare camera-ready manuscripts and finalize supplementary materials
  2. Coordinate travel plans and poster backdrops for Singapore
  3. Schedule rehearsals for the oral presentations
  4. Network with fellow APSIPA attendees to explore collaborations in speech-based health analytics

I look forward to sharing our findings with the APSIPA community and gathering feedback that will fuel the next phase of our research. See you in Singapore!

Monday, August 04, 2025

Perbedaan luaran institusi pendidikan dan institusi riset

Empat bulan ini saya menjalani profesi baru, menjadi asisten profesor di sebuah universitas. Sebelumnya saya bekerja di institusi riset. Meski perubahan profesi ini terlihat smooth, ada hal dasar yang membedakan antar keduanya.

Persamaan luaran institusi riset dan pendidikan terletak pada publikasi. Dua-duanya menilai publikasi sebagai luaran. Namun ada perbedaan mendasar antar keduanya, yakni pada sisi authorship. Sebagai periset, menjadi penulis utama adalah tolok ukur keberhasilan periset yang bersangkutan. Hal ini berbeda dengan profesi dosen di institusi pendidikan.

Di institusi pendidikan, tolok ukur utama keberhasilan adalah ketika bisa mendidik mahasiswa untuk menjadi penulis pertama  dalam sebuah publikasi, entah itu conference paper atau pun jurnal. Seperti dalam tulisan saya sebelumnya, menjadi penulis pertama artinya menjadi kontributor utama. Disini lah letak keberhasilan itu, mendidik mahasiswa untuk berkontribusi dalam sains dan riset. Bukan menjadikan dirinya sebagai penulis pertama. 
 

Bagaimana seharusnya menilai kinerja periset dan dosen?


Karena tolok ukur keberhasilan yang diusulkan di atas tadi berdasarkan keberhasilan menjadikan mahasiswa sebagai penulis utama, maka setidaknya ada dua kriteria untuk menilai periset dosen. Kriteria pertama dengan banyaknya (kuantitas), kriteria kedua dengan seberapa baik kualitas paper atau journal yang diterbitkan. Untuk kriteria pertama cukup jelas, misalnya berapa jurnal publikasi per tahun. Untuk kriteria ada beberapa metrik/standard yang bisa dipakai. Cara pertama, yang saya usulkan, adalah dengan memakai metrik Google Scholar, yakni kualitas publikasi dinilai dari masuk tidaknya jurnal atau conference (keduanya dipukul rata) tersebut dalam Google Top 20. Misalnya bidang saya, acoustic and sound, ada pada list berikut. Cara ini cukup efisien dan fair, tidak peduli entah dia jurnal atau conference paper. Cara kedua yakni dengan menggunakan quartile Scopus, yakni publikasi (hanya jurnal) harus masuk antara Q4 sampai Q1. Semakin tinggi nilai Q-nya, semakin tinggi bobot kualitasnya. Namun ada kelemahan dalam cara kedua ini, yakni bagaimana menilai conference paper? Padahal conference paper dewasa ini keterbaruannya lebih tinggi daripada jurnal karena frekuensi penyelenggarannya tahunan.


Masalah selanjutnya adalah dalam penilaian kinerja periset atau dosen. Karena perbedaan authorship luaran diatas, maka penilaiannya harus dibedakan pula. Tidak seharusnya dosen dinilai dari sisi penulis pertama; sebaliknya hal tersebut berlaku pada periset. Dosen hendaknya dinilai dari kualitas dan kuantitas publikasi yang dihasilkan, yang besar kemungkinan berbanding lurus dengan jumlah mahasiswa yang diluluskannya.

Wednesday, July 30, 2025

Otak kedua: berpindah ke UpNote

 Setelah frustasi karena Simplenote tidak bisa sinkronisasi dari Tablet (Galaxy Tab s8+) setelah reset pabrik (factory reset), saya berusaha mencari alternatif aplikasi catatan (note taking app). Note bagi saya adalah aplikasi yang sangat penting, dari mencatat TODO, resume presentasi, recap eksperimen, ide yang tiba-tiba melintas, termasuk beberapa hal rahasia (akun dan password dari sebuah website, meski ini sangat tidak disarankan untuk mencatatnya; tapi daripada lupa!). Berikut aplikasi catatan yang pernah saya coba sebelumnya, alasan memilih UpNote dan kekurangannya.

 Aplikasi catatan sebelumnya yang saya gunakan: 

  • Evernote: aplikasi catatan cloud pertama saya mulai dari zaman kuliah S1, kekurangannya: tidak ada aplikasi native Linux, berbayar bulanan.
  • Google keep: aplikasi catatan dari Google yang saya gunakan untuk mencatat hal-hal singkat. Kekurangan: lemot dan tidak ada aplikasi native linux (hanya web app offline).
  • Obsidian: bagus tapi tidak terbiasa (gagal membiasakan).
  • Foam: bagus tapi tidak terbiasa (sedang membiasakan).
  • Standardnotes: sederhana, ringan, dan mendukung blogging (listed.to). Masih saya pakai untuk catatan bahasa Inggris dan keagamaan.
  • Simplenotes: Sangat sederhana dan powerful. Hanya mencatat teks, tidak ada gambar (kecuali offline), bisa dibuka dari web. Bisa langsung publish ke wordpress jika membuka catatan dari aplikasi Android. Sayang, terakhir saya gagal sinkronisasi dari Tablet. 
  • Upnote: Sedang mulai menggunakan. 

 

Kenapa Memilih UpNote:

  • Cross platform, khususnya Ubuntu Linux dan Android
  • UpNote supports one time payment; tidak perlu membayar bulanan
  • UpNote mendukung spellcheck, termasuk bahasa, aplikasi lainnya tidak mendukung spellcheck
  • Ringan, file instalasi kurang dari 20MB untuk Android
  • Support migrasi dari Simplenote (dari JSON file)

 

Kekurangan UpNote:

  • Tidak ada versi webnya seperti Simplenote 

 

Tulisan ini (mungkin) akan diupdate berkala.

Thursday, July 17, 2025

Deciding Who is the First Author: A Contribution-Based Approach

In the complex landscape of academic publishing, few decisions carry as much weight as determining authorship order, particularly the designation of first author. This seemingly straightforward choice can significantly impact careers, recognition, and professional trajectories. While various approaches exist for making this determination, the contribution-based method stands as the most equitable, scientifically sound, and ethically defensible framework for academic authorship decisions. 
 

Understanding Different Approaches to First Authorship

When deciding who should be the first author in an academic paper, several approaches can be taken:

  • Funding-based: The author who funded the research is placed as first author
  • Idea-based: The author who had the original idea about the research is placed as the first author
  • Contribution-based: The author who made the largest overall contribution is placed as the first author

Among these three approaches, the contribution-based method is the most sensible and widely accepted in contemporary academic practice.

The Case for Contribution-Based Authorship

Promoting Scientific Merit and Intellectual Honesty

The contribution-based approach fundamentally aligns with the core principles of scientific inquiry: merit, rigor, and intellectual honesty. Academic research is, at its essence, a collaborative endeavor where multiple individuals contribute their expertise, time, and effort to advance knowledge. By prioritizing actual contributions over external factors like funding sources or hierarchical positions, we ensure that recognition aligns with genuine scholarly input.

This approach acknowledges that scientific breakthroughs rarely emerge from a single moment of inspiration but rather from sustained, methodical work involving data collection, analysis, interpretation, writing, and revision. The individual who invests the most comprehensive effort across these various stages of research deserves primary recognition, regardless of their institutional position or financial backing.

Addressing the Limitations of Alternative Approaches

Problems with Funding-Based Authorship

The funding-based approach, while seemingly logical from an administrative perspective, creates several problematic precedents. First, it conflates financial resources with intellectual contribution, potentially rewarding wealth or institutional privilege over scholarly merit. A principal investigator who secures funding but delegates the actual research work should not automatically receive first authorship simply due to their fundraising success.

Moreover, this approach can discourage young researchers and graduate students who may lack the institutional power to secure funding but possess the passion, skills, and dedication to drive research forward. It perpetuates academic hierarchies that may not reflect actual intellectual contributions, potentially stifling innovation and diversity in research leadership.

Limitations of Idea-Based Authorship

While ideas are undoubtedly important in research, the idea-based approach oversimplifies the research process. Ideas, no matter how brilliant, remain merely theoretical until transformed into rigorous scientific investigation. The journey from concept to publication involves countless decisions, methodological refinements, data interpretation challenges, and writing iterations that often prove more challenging and time-consuming than the initial conceptualization.

Furthermore, ideas in academic research rarely emerge in isolation. They typically build upon existing literature, emerge from collaborative discussions, or evolve significantly during the research process. Attributing first authorship solely to the person who first articulated an idea fails to recognize the collaborative and iterative nature of knowledge creation.

The Comprehensive Nature of Contribution-Based Assessment

The contribution-based approach offers a more holistic evaluation of authorship by considering multiple dimensions of research involvement:

Research Design and Methodology

Contributors who develop research protocols, design experiments, or create innovative methodological approaches demonstrate substantial intellectual investment that extends far beyond initial ideation.

Data Collection and Analysis

The meticulous work of gathering, processing, and analyzing data often represents the most time-intensive and technically demanding aspect of research. Those who take primary responsibility for these tasks deserve recognition proportional to their investment.

Interpretation and Synthesis

The ability to interpret results, synthesize findings with existing literature, and draw meaningful conclusions requires deep subject matter expertise and critical thinking skills that should be acknowledged in authorship decisions.

Writing and Communication

Transforming research findings into clear, compelling academic prose is a skill that significantly impacts a paper's reach and influence. Authors who take primary responsibility for writing and revision contribute substantially to the research's ultimate impact.

Promoting Fairness and Career Development

The contribution-based approach particularly benefits early-career researchers, including graduate students, postdoctoral fellows, and junior faculty members. These individuals often provide the majority of hands-on research work but may lack the institutional power associated with funding acquisition or senior academic positions.

By prioritizing actual contributions, this approach ensures that career advancement opportunities are distributed more equitably, encouraging talented young researchers to pursue academic careers. It also promotes mentorship relationships where senior researchers guide and support junior colleagues while appropriately sharing recognition for collaborative achievements.

Establishing Clear Guidelines for Implementation

To implement contribution-based authorship effectively, research teams should establish clear guidelines at the project's outset. These might include:

  • Transparent documentation of each team member's planned and actual contributions
  • Regular discussions about authorship as projects evolve and contributions shift
  • Clear criteria for measuring different types of contributions (quantitative vs. qualitative work, technical vs. conceptual contributions)
  • Conflict resolution mechanisms for addressing authorship disputes

Addressing Common Concerns

Critics of the contribution-based approach sometimes argue that it can be subjective or difficult to quantify. However, this challenge exists in any authorship determination system and can be addressed through transparent communication, documented agreements, and established disciplinary conventions.

The key is fostering a culture of open dialogue about contributions rather than avoiding these conversations until manuscript submission. Regular check-ins throughout the research process can help ensure that all team members understand and agree upon their roles and the implications for authorship.

Global Academic Standards and Best Practices

Major academic organizations and publishers increasingly endorse contribution-based authorship. The International Committee of Medical Journal Editors (ICMJE) and similar bodies emphasize that authorship should reflect substantial contributions to conception, design, execution, or interpretation of research, along with participation in writing and final approval of the manuscript.

This growing consensus reflects the academic community's recognition that contribution-based authorship best serves the interests of scientific integrity, fairness, and the advancement of knowledge.

Conclusion

The contribution-based approach to first authorship represents the most equitable and scientifically sound method for recognizing academic achievement. By prioritizing actual intellectual and practical contributions over external factors like funding or institutional hierarchy, we create a system that rewards merit, encourages collaboration, and supports career development across all academic levels.

As the academic landscape continues to evolve, with increasing emphasis on interdisciplinary collaboration and diverse research methodologies, the contribution-based approach provides the flexibility and fairness necessary to navigate complex authorship decisions. It ensures that recognition aligns with effort, that junior researchers receive appropriate credit for their work, and that scientific progress is driven by merit rather than privilege.

Ultimately, adopting contribution-based authorship decisions strengthens the integrity of academic publishing while fostering an environment where the best ideas and most dedicated researchers can thrive, regardless of their position in traditional academic hierarchies.

Tuesday, June 24, 2025

Kriteria baru untuk Googling

Dulu, sebelum hari ini, saya punya kriteria untuk Googling: apakah ada manfaatnya? kalay iya, saya lanjut googling, kalau tidak, saya hentikan. Kini kriteria itu saya ubah, saya perketat. Ini kriteria baru tersebut.

Apakah saya bisa jadi faham setelah googling?

Begini bedanya, kalau manfaat bisa jadi relatif. Misalnya saya googling "Agama si A", "Amalan si B", "Pendidikan si C". Apakah ada manfaatnya? Ada semua. Manfaatnya, jadi tidak tahu menjadi tahu. Lalu so, what? Setelah tahu, apakah bisa dapat pahala? bisa iya, bisa tidak, tergantung pengetahuan tentang apa. lalu apa bedanya dengan faham??

Bedakan dengan googling berikut: 

"apa bedanya sistem hepburn dan sistem kunrei?", 

"bagaimana mencegah radang tenggorokan?", 

"berapa jumlah langkah minimal perhari yang disarankan WHO?". 

Kriteria terakhir, apakah saya bisa paham setelah googling, pasti bermanfaat. Jadi menjadi paham pasti bermanfaat, tapi sekedar bermanfaat belum tentu paham (misalnya hanya tahu saja). Apakah mendapat pahala? bisa jadi iya bisa jadi tidak, terkadung paham tentang apa. Tapi setidaknya, potensi untuk  mendapatkan pahala lebih besar, karena paham tadi (misalnya paham mana yang boleh dan mana yang tidak boleh).

Wallahu a'lam bisshowab.

Monday, June 23, 2025

BFG yang tertunda

Tahun ini saya rencananya pulang ke Indonesia selamanya, Back for Good, alias BFG. Qodarullah, beberapa bulan sebelum saya pulang (sekitar 7 bulan), saya mendapat kabar kalau saya diberhentikan (dengan hormat) dari PNS. Dalam kurun waktu tujuh bulan tersebut saya harus bisa mencari pekerjaan baru karena kontrak pekerjaan lama akan berakhir Maret 2025 (karena itulah saya berencana BFG). Di Jepang, umumnya orang mencari pekerjaan dalam kurun waktu 1-2 tahun sebelum mulai bekerja. Seperti mahasiswa saya sekarang, baru masuk S2 sudah mulai mencari pekerjaan. Padahal lulusnya masih dua tahun lagi.

    Alhamdulillah, kurang lebih empat bulan sebelum kontrak pekerjaan lama selesai, saya mendapat kepastian tentang diterimanya aplikasi saya untuk menjadi seorang asisten professor di sebuah kampus negeri di Jepang. Inilah hikmah saya diberhentikan dari PNS. Agar bisa menjadi seorang asisten professor di Jepang. Saya teringat kata-kata seseorang beberapa tahun lalu ketika dia menolak saya: urip iki manut miline banyu mawon. Saya juga teringat kata-kata seorang professor di universitas terkemuka di Jepang saat beliau menolak aplikasi s3 saya: I am hoping your fruitful stay in Japan. Inilah hidup, Boleh jadi sesuatu yang tidak kamu sukai, padahal ada baiknya bagi kamu. Dan, boleh jadi kamu sukai sesuatu, padahal dia itu tidak baik bagi kamu. Dan, Allah mengetahui, sedang kamu tidaklah tahu (2:216).

    Seperti halnya saya memaknai bahwa kekalahan adalah kemenangan yang tertunda, saya memaknai gagalnya BFG tahun ini adalah BFG yang tertunda.

Thursday, January 30, 2025

A proposal for file extension of back up files

There are several extensions used for backup files: .0, .1, .old, .bak, .backup, .bkp, .baka, etc. Based on Reddit votes, the most used is .bak; therefore, we should use the extension used by common sense.


Specification:

  1. A backup file must be named with the extension .bak
  2. If there are multiple backups, the next backup extension must be added with an integer, e.g., .bak1, .bak2, etc.
  3. The above rules also apply for folder or directory, e.g., folderA.bak, dirB.bak1.

Finding all backup files

To find all backup files, simply use a shell command

$ ls *.bak*
a.bak  a.bak0  a.bak1  a.bak2

Tuesday, January 14, 2025

A paper was accepted at 2025 ICASSP Workshop!

Alhamdulillah, our paper has been accepted for a satellite workshop of ICASSP 2025. This paper discusses "Pathological Voice Detection From Sustained Vowels: Handcrafted vs. Self-supervised Learning". We proposed to examine pathological voice detection from sustained vowels (/a/, /i/, /u/) both using acoustic features and self-supervised learning (SSL) models. We also evaluated early fusion (feature concatenation) and decision-level ensemble learning for both types of features.

Our work is highly beneficial to society, as it will help to improve the performance of pathological voice detection. 

Several aspects were evaluated in this research project: evaluation of different vowels (which one leads to better results), evaluation of different acoustic and SSL features, and ensemble learning results.

Future work could tackle the limitations of the F1 score AUC by using more recent metrics like the Matthew correlation coefficient (MCC), which considers true and false positives and negatives.

Since the nature of the problem of detecting pathological voices can be classified as anomaly detection, future work can also be accomplished to observe the effectiveness of anomaly detection methods for pathological voice detection.

We extend our gratitude to AIST for their full support of our research, and to NEDO and JST for research funding.

Happy reading. We welcome your feedback. See you in Hyderabad!



URL for downloading the paper: (will be given after it is available or contact me to get the accepted version). 

Project repository: https://github.com/bagustris/svd-exploration

Monday, January 06, 2025

A paper was accepted at ICAIIC 2025!

Alhamdulillah, our paper has been accepted for the conference ICAIIC 2025. This paper discusses the importance of ensemble learning to improve speech classification accuracy. We proposed performance-weighting methods to evaluate with two variants: using weighted and unweighted accuracies.

Our work is highly beneficial to society, as it will help to improve the performance of speech classification. It may also be generalizable to other domains outside of the speech area.

Several aspects can still be developed further, such as incorporating other weighting methods, and implementation in other datasets as well as in other tasks. We invite readers to collaborate in addressing the unresolved questions above.

We extend our gratitude to AIST for their full support of our research, NEDO and JST for research funding.

Happy reading. We welcome your feedback. See you in Fukuoka!

URL for downloading the paper: (will be given after it is available or contact me to get the accepted version).




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