Chapter 247: Weight and Threshold

"Ten minutes." Director Wang glanced at the electronic clock on the wall, his voice sounding dry in the sealed server room.

Lin Chen did not answer. The orange temperature icon in the lower right corner of the screen was still blinking at a steady rhythm, like a metronome counting down. The blades of the industrial fan sliced through the scorching air with a continuous hum. He stayed seated with his weight on his right foot and his left foot suspended, spine leaning slightly forward, eyes never leaving the terminal window. The log had stopped scrolling. The final line remained fixed at [INFO] Pipeline execution complete. Latency: 1.62s.

Su Man set the tablet on her knees, her fingers moving quickly across the screen. She was checking the warning accuracy. The double-blind test set contained twelve hundred records, and the system had flagged one hundred and fourteen high-risk indicators. She compared them one by one against the gold-standard answers provided by the hospital. Her stylus tapped lightly on the screen, marking checks and crosses. The movements were so light they made no sound.

"One hundred and nine hits," she said quietly without looking up. "Five missed reports, three false positives. Accuracy, ninety point eight percent."

Lin Chen nodded. It was four-tenths of a percentage point lower than in the offline rehearsal. Within expectations. The hospital intranet's data-cleaning standards were stricter; some edge-case feature vectors had been truncated, and the model had taken a conservative approach to the confidence threshold. He said nothing, only typed a command into the terminal to export the three false-positive case features into the local log. They would need to retune the parameters after they got back.

A faint clatter of keys came from the neighboring workstation. Zhiyi Cloud's engineers were organizing their demo report. Their custom server was running smoothly, the liquid-cooling radiator on the side of the chassis glowing a cold blue. Their advantage in compute power was real, but their model was bulky, and decryption took a full four seconds longer than Lin Chen's. They had lost points on the response-time weighting. Lin Chen understood the underlying rules of this scoring logic: what the hospital wanted was not perfect laboratory data, but a stable system that could run under network outages, high temperatures, and aging terminals. Fault tolerance mattered more than peak performance.

The temperature in the air was still climbing slowly. The phase-change threshold of the thermal paste had already passed, and the motherboard temperature held at eighty-two degrees. Lin Chen rested his left hand on the edge of the desk, his knuckles pale from staying tense for too long. The calf muscle in his left leg began to twitch uncontrollably. He took a deep breath and shifted his center of gravity half an inch to the right, giving the spasming muscle a little stretch. The pain was dull, like being pricked by a needle through thick cotton. He was used to it.

"Two minutes left." The director of the hospital office checked his watch, walked over to the expert, and murmured something. The expert closed his notebook and folded his hands on the table.

Su Man put down the tablet, folded the process sheet, and slipped it into a folder. She turned to glance at Lin Chen. There was no excitement in her eyes, only the calm that came after surviving a critical threshold. Lin Chen gave a barely perceptible nod in return. He knew what she was thinking. Winning only meant they had obtained an admission ticket. The real hard fight would be data integration and compliance review.

The electronic clock clicked over to 10:50.

Director Wang's phone vibrated. He looked down at the screen, stood, and walked to the space between the two workstations.

"Taking response time and warning accuracy together, the weighted calculation is complete." His voice had returned to its usual steadiness. "The phase-two pilot slots are allocated as follows: the Zhiyi Cloud team will be responsible for the inpatient ICU module, with a six-month pilot period. Lin Chen's team will be responsible for the outpatient triage and chronic-disease follow-up modules, also with a six-month pilot period. The hospital information department will email the specific access schedule this afternoon."

There was no cheering, no handshake. Only the sound of the fans turning in the server room.

The head of Zhiyi Cloud stood, gave Lin Chen's side a polite nod, and immediately began directing his team to dismantle their equipment. They moved quickly, with the practiced fluency of a major company's project delivery team. Lin Chen stood as well. The instant he rose, his left foot lost all sensation, as if he had stepped onto a sponge soaked through with water. He paused for a second, waited for the blood to flow back, and only then put his full weight on it.

"Pack up," he said to Su Man.

The two began disconnecting cables. Network cables, power cords, cooling stand, shockproof backpack. Their movements were mechanical and efficient. Lin Chen placed the laptop into the backpack and pulled the zipper shut. The metal clasp made a crisp click. He shouldered the bag, and the strap cut into his collarbone. The weight was solid.

The moment he pushed open the fire door, cold air from the corridor rushed over him. The sweat on his skin chilled instantly, raising a fine shiver. Lin Chen leaned against the wall and closed his eyes for a moment. The calf muscle in his left leg was still jumping. He slowly crouched and pressed his fingers through the trouser leg into the point above his Achilles tendon. He pressed hard, until the pain overrode the numbness.

"Wait in the car," Su Man said. "I'll go get the agreement."

Lin Chen did not move. He watched the hospital-office assistant walking from the far end of the corridor. The assistant was holding a kraft-paper file bag with the hospital emblem printed on the cover.

"Engineer Lin, Engineer Su." The assistant stopped and handed over the file bag. "This is the preliminary access agreement for the phase-two pilot. Also, Director Li from the information department asked me to pass along a message."

Lin Chen took the file bag. The paper was thick, its edges sharp.

"What message?"

"The outpatient system involves patient privacy data. Before close of business next Monday, you need to submit the preliminary draft for Level-3 classified protection filing, as well as a detailed design for the data desensitization plan. The hospital audit team will review it first, and only if there are no problems can the test network segment be opened." The assistant paused, then added, "Director Li said the timeline is tight, but the rules cannot be skipped. Please move quickly."

Lin Chen opened the file bag. The first page was the agreement table of contents; the second was a list of compliance requirements. Level-3 classified protection. Data desensitization. Audit process. Behind every term were dozens of pages of documentation and at least three months of rectification work. With their current team size, they did not even have a dedicated security engineer. The permission management in their codebase was still based on basic RBAC, and log auditing only retained local records; it had not been integrated with the hospital's unified identity authentication. The gap was large.

He closed the file bag and handed it back to the assistant. "Received. We'll submit it before Monday."

The assistant nodded and turned to leave. His leather shoes struck the epoxy floor in a regular rhythm.

Su Man came over, glanced at the file bag in Lin Chen's hand, and did not ask what was inside. She only said, "The car is on basement level two. The elevator is out. Stairs."

"Mm." Lin Chen tucked the file bag under his arm and adjusted the backpack strap. The numbness in his left foot was slowly fading, replaced by a clear ache. He stepped forward. The first step was steady.

The voice-activated lights in the stairwell came on floor by floor with the sound of their footsteps. The light was stark white, falling across the mottled walls. Lin Chen walked in front, Su Man half a step behind him. They did not speak. Only footsteps and breathing echoed through the empty stairwell.

He knew the demonstration was over. But the real system had only just begun to compile.

His phone vibrated in his pocket. He took it out. It was a text from an unfamiliar number: Mr. Lin, this is Zhao Qiming from Qiming Capital. I heard you won the outpatient pilot. Next Tuesday at three in the afternoon, I'll be waiting for you at China World Trade Center Tower 3. Let's talk about your Series A.

Lin Chen stared at the screen. His thumb hovered above the keyboard. Wind poured in through the stairwell vent, carrying the damp smell of the underground garage and motor oil. He pressed the lock button and slipped the phone back into his pocket.

His steps did not stop. He kept walking down.